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Oct. 8, 194.6.
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'J'. DUNLOPEI'AL _
.
2,408,761
SAFETY DEVICE FOR ELEVATORS
. Filed Dec. 6, 1943
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7 Sheets-Sheet 1
.15
WITNESSES: ‘
‘
INVENTOR5
ORNEY ’
‘0a, 8, 1946.
J. DUNLOP ETAL
2,408,761
SAFETY DEVICE‘ FOR ELEVATORS‘ ‘
Filed Dec. 6 . 1943
’ QMZ
WiTNESSES:
‘
‘7 Sheets-Sheet 2
Oct.‘ 8, 1946.
-
\ ~ J. DUNLOP' ETAL
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(3)
'7 Shveets-Sh'eet 3
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I WITNESS-ES:
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' 2,408,761
SAFETY DEVICE FOR ELEVATORS
Filed Dec. 6, 1943
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'~
INVENTORS
.
‘
\
_
¢mes Dun/0,0 and
_
;
Oct.v 8, 1946.‘
Y J. DUNLOP ETA;
»
2,408,761
SAFETY'DEVICE FOR ELEVATORS
Filed Dec. 6, 1943
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7 Sheets-Sheet 4
12a /52
I29
WITNESSES:
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Oct. 8, 1946.
J.’ .DUNLOP ETAL
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2,403,761
SAFETY DEVICE FOB. ELEVATORS
‘Filed Dec. 6, 1943
7 Sheets-Sheet 'r
.66
15-901
.
150
(50a
64
64
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Patented Oct. 8, 1946
, 2,408,761
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2,408,761‘. f H
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‘I ’ SAFETYI/JEvIQE FoniiLEvA'roRs
James Dunlo'p‘, v'RidgewoodyN. J.',>~and Hans" E.
Ha'nsen,>Westerligh, Staten Island, N..Y., as
signors, by mesne assignments, to Westing
‘house "Electrics ., Corporation, -' East
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p
_v 7
*1 Application‘ December I e, 1943; Serial: No. 513,030
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Pittsburgh.
. Pa., a corporation ,of Pennsylvania I
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‘211Claims.
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<c1.'1s7-_'-ss)
,
drawings for a ‘better understanding of the in
Our invention relates to safety devices for ele
vators and, more particularly,1to friction safety
devices for largedeck-edge elevators on ships,
or. for. drawbridges or heavy ‘freight elevators.
vention.v
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‘
Figure 1 is a diagrammatic representation in
aft end elevation of a deck-edge elevator attached
to-an' outboard portion of the hull of a ship;
Fig. 2 is a diagrammatic view of the elevator
- One fobjectlof' our invention is to provide a
safety apparatus for an elevator body with ‘two
sets for hoistingcables which will lprovide means
for stopping both :ends of the elevator body in
either‘the’ up or the down direction when either
shown in Fig. 1 as taken from the interior of the
ship and looking in outboard direction, for illus
trating the hoisting apparatus more clearly;
10 v,‘Fig'. 3 is a‘top‘plan view of the elevator plat
set of cableslb'reaks.
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v
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form and guide rails with our-improved‘ safety
v.An'other object is to provide a friction safety
apparatusfor eachend of'an elevator platform
apparatus attached thereto;
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. Fig. 4-. is a View in side elevation looking in the
having two sets of hoisting cables in‘ which the
outboard direction of the elevator platform, parts
Ifrictionalresistanceto‘the falling end of the plat
of its hoisting cables, and our improved safety
form in. case‘ of‘a break in the cables will be 15
apparatusassociated therewith;
different. from the frictionalv resistance in the
Fig. 5 isan enlarged view in‘ aft end elevation
‘safetylapparatus at the other end of theplat
of .our improved safety apparatus shown in Fig. 3
form if it moves upwardly.
'
A further object isito- provide a safety device '
mounted'on the aft end of the elevator; .
. Fig. 6 is an enlarged view in side elevation
for. an elevator having safety pawls on the releva 20 looking
in outboard direction of one of the safety
tor platform for engaging notches in the elevator
devices shown in Fig. 3 as mounted on the aft
guide and for‘positioning the pawls at a pitch ‘
which-is a multiple ofv the pitch of the notches
on‘: the elevator guides so ‘as to reduce-the dis
tance of free fall of-the elevator platform in case
of va break in- its cables.
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end of=the elevator;
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v-Fig? is anenlarged view of thef'energy storing
spring. casing and push rod for'biasing the‘safety
operating rod into safety releasing operation‘;
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~ Fig. 8 is a‘ view in side elevation, partly in full
line and partly in section, of two of the‘safety
pawls and the friction plates and friction springs
therewith;
which'all of the pawls will be operated'at the 30 associated
‘ Fig. 9 is a view taken on the line IX—IX of
' Ai'still further object is to provide a pawl and
notchl'operated safety device for an elevator body
havinga set ofhoisting cables at each v‘end in
same" instant to stop the elevator body regardless
Fig. 8;
ratus "for an elevator‘ platform-having a set-‘of
hoisting cables at each end attached to hitch 35
boxes having hitch plates for operating the safety
apparatus.‘ and in which'box springs are com
pressed by the tension of vthecables to store energy
for shooting the hitch plates out of safe position
into safety operating position when the safety is
operated by the failure of one ‘or both sets of
~.
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Fig.10 is a view taken on the line X-—X of Fig;
9 as seen‘ when looking aft at the safety shown
of-whichzsetof
‘ .Astill further cables
object fails.
isv to provide
~
a~ safety
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appa
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in :Fig. 5, and.
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"
' Fig. 11 is a view in end elewationvof a portion
of theupper end of the'safety devices showing
how? its outer plate is bolted to its support.
' Our invention is illustrated in connection with
40 adeck-edge elevator such as is used on airplane
carrier ships. for transferring airplanes from the
main deck to the flight deck or from the ?ight
deck toithe main deck. 'Elevators of this type
‘A further object is to provide'a'safety apparatus
have their platforms mounted on ‘the outside of
for exceptionally large elevato'r'bodies whichshall 45 the hull at one side of the ship in alignment with
cables‘
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be rugged and which will provide‘ su?icient fric
an opening therein to the maindeck and are mov
tional resistance to bringsuch largebodies to a
able up and‘ down on the side of the ship to ‘serve
the main deck and the flight deck. Some of these
stop within avery short distance without damag
ing either theelevator bodies or the apparatus or
structures associated with it. ,
I
platforms are approximately sixty‘feetlong and
50. extend outwardly from the hull ‘over thirty feet.
a frictional safety device which-shall be simple '
However, it is to be'understood that the invention
may be used in connection with many other-forms
and easy to manufacture, install, and maintain in
of; elevators, drawbridges, etc.
_ it is alsolan object of our inventionto provide
operation.
M
._-B,e_fe_rence may
-
had toethe accompanying
'
1 Referring more particularly to Figs. 1 and 2 of
55 the drawings, we have illustrated a deck-edge
_
2,408,761
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elevator comprising an elevator platform l0 dis
posed between a pair of guide rails H and I2
mounted on the outside of a ship hull l3, in
position to be supported by and to be raised and
lowered between a main deck l4 and a ?ight deck
[5 by a ‘plurality ofv hoistingcables ‘l5 and I1
operated-by a hoisting engine l8.
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The platform Ill comprises a base section 20
and a hinged or outboard section 2| which nor-‘1: _
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engine bed at the rear of the engine, thence
around one of the power sheaves 38, and thence
to a plurality of hitches 41 mounted on the un
derside of the engine cylinder.
The hoisting cables I‘! are secured to the fore
end of- the‘ platform by suitable cablefhitches 48
mounted thereon and pass‘upwardly'and over an
idler sheave 49 fastened to the ship structure
underneath the overhanging portion of the ?ight
mally lie in the same plane and provide a large 1.0,, deck, thence rearwardly over a second idler
sheave 50' mounted on the ship frame inside the
and carried from one deck to the other. The _ 7131111‘, and thence downwardly and under a de
base section of the platform is constructed .with. - j" ilectorysheaye 51- mounted on the fore end of
level area upon which airplanes vmay be moved"
a suitable flooring 22 laid upon’ a frame 23 made.
theengine bed,.th,ence under and over one of the
of seamless steel tubing, structural steelseotions- 7' -; power sheaves 38in the plunger head, and thence
and steel plate welded together in bridge like" tosuitable" dead-end hitches 52 secured to the
construction to form a relatively light butstrong ,
upper rear part of the engine.
body. The outboard section of the platform is
' 'Inasmuch as the platform I0 is very long and
also constructed with a suitable floor 24'4laid'upon ~
heavyand is operated and supported entirely be
a frame 25 of seamless steel tubing, structural 20 tween its guide rails by the hoisting cables at its
steel and. steel vplate welded together in bridge-1
like construction in the same manner as the base
and.» is mounted upon and, connected to the, base
with .aJsuitable hinged joint .26 so that it may .be
raised from itsnormal horizontal position into a
vertical position on the base when the ship has
to passv through a lock orother narrow opening.
, Thezguide rails H and 52 are mounted in .posi
fore andaft ends, anample safety means for
stoppingit quickly and safely andrestingit upon
its guide rails,,upon failureof the hoisting. cables
at eithe-ror both ends of the platform .isrequired.
Furthermore, inasmuch, as the platform isoper
ated by two sets of- cables,’one at. each. end, a
safety means for both up and‘ down direction is
required, so that if the cables atone end break
and the cables at the, other end continue their
hull [-3 by means of a plurality of horizontally 30 upward pull, the platform will», be stopped at
disposed brackets .28.
.
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both ends before it tilts to a dangerous position.
The guide rails are provided With‘vertical slots
Also, in case of failure of the cables atonly'one
29 in their sides facing each other forreceiving
end while the platform is. moving. upwardlythe
aplurality of rollers .35 rotatably _mounted on
downward pull of gravity atthat- end. and the
the base section 26 for the purpose of guiding the
upward pull of the intact-cables at the other end
movement of the-elevator platform as it is raised
will require the applicationsof different fric
or lowered and for also maintaining the platform
tional stopping. forces for .the up direction and
in its horizontal position.v A block 3.2,is securely
the down direction to keep the platform from
fastened by welding to the lower endofeach
being stopped in a tilted condition;
guide rail to prevent the elevator from dropping
In order to meet these requirements, we have
on down through the slots incase of failure of the
provided the platform with safeties 53 and 54
safetiescables, etc. Normally the platform is
having stopping pawls biasedgto engage notches
suspended entirely by the hoisting cables. , The
33 on'the guide rails or safety standardsto'stop
guide rails are. also providedwith notchedv sides
the platform’ upon failure of either .or both sets
>33;so;that they may be usedv as safety standards. ;
of cables. vThe pawls on both-safeties are re.
in cooperationv with safety, apparatus for stop
strained from operation by; ,a pair of, gates con
ping the platform in case of failure of the hoist
trolled through an operating rod 55 biased to
ingjcables.
wards pawl releasing position by a compression
vThe hoisting engine 13 is, ahydraulic engine
springv 56 in a casing 5'! but prevented from mov
tion and facing each otherion the side of theship
comprising a single cylinder téxmountedin -.a 50 ing to-itspawl releasing position by triggerv hitch
horizontal position on a frame or engine bed 35
plates~g58 and 59 on the platform ends of the
and a power plunger 33 disposed in the cylinder.
cables. Furthermore, firtictionplatesare mount
The outer end of the plunger is provided with a
ed/ in the safeties to “permit, alimited relative
power head 31 in which a pairof power sheaves
movement between-the safeties and the platform
38 are rotatably mounted. The plunger- is. de 55 when the safetiesgrab the, guide rails for either
signed to slide back and forth in the cylinder, and
thereby move the'power sheaves to operate. the
hoisting cables. Any suitablehydraulicmedium
such as oil placed under pressure by anysuitable
pumping apparatus (not-shown) may. be. used for
operating the plunger. VA valve .49. and a motor
4| foroperatingit are mounted on the cylinder
for controlling the operation of the plunger by
controlling the admission of the oil to the.
direction.
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.If..either .set of cables fails,jits trigger; hitch
plate releases the rod. to. operation by the biasing
spring which causes the rod to release the pawls
onboth safeties so that they dig into the notched
guide rails and thereby stop the safeties and the
platform, the friction plates absorbing suchdam
aging energy as may be generated by the sudden
cylinder.
stopping of the platform by the safeties.
The hoistingcables I6 .are secured to the aft
6.1101 of the platform (Fig. 2) by suitable hitches
or‘safetiy device 64'connected by frictional devices
‘ Referring more particularly tovli'igs. 6, 8, 9, 10
and 171', the safety 53 comprises a pawl carriage
42 mounted thereon and pass upwardly and over
with a housing 5i having a rear housing plate
an idler sheave 43 fastened to the ship structure
62 and a front housing plate 63 mounted on the
underneath the overhanging portion of the ?ight 70 platform. The rear housing plate 62 is provided
deck, thence rearwardly over; a second idler
with an inwardly. extending friction ?n or plate
sheave 44' mounted on the ship frame inside the
65, and is mounted in. a vertical position between
hull, thence downwardly and under a de?ector
an upper beam 65. and a lower beam 61 con
sheave 45 mounted on the engine bed- 35, thence
structed of steel plates. Each beam is welded
around astationar'y sheave '46 mounted on the 75 securelyto‘ the frame‘ 23: of the base section plat
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> , A. strip of- brake‘ lining 92_ is .1 mounted on ' ‘the
form; fiThe I rear.;housing; plate; .62‘ is welded; to
friction" plate 90 in position to engage the-adja
cent face of the friction ?n 68 (Fig. 9) anda
similar strip 9310f brake lining ,is 'disposed‘on
the opposite side of thefriction plate toengage
the-peamsiso 'as; to‘provide' a strong permanent
attachment tothe‘ platform; frame .su?icient to
withstand any strain which may be placed »_upon
the safety. ' The fronthousing plate 63 is provided
a ‘,‘long”v friction bar 94v embraced between that
with ‘an inwardly extending friction fin or plate
brake. . lining and a strip of brake ,,1ining;;95
mounted on a friction strip 96. A strip of brake
68Zf'acin‘gzthe fin 65 on the rear plate and 1Sg$8f
cured at its upper ‘end to the beam 56: and at; its
lining 91 is‘ ?xed on the'friction plate ,98. inipo
7 low endto. theglower, beam 81 by a plurality of
sition to engage the adjacent face of the friction
bolts} and vplates :59. so as to facilitate the assem+ 10 ?n‘: 65 and ,a-‘strip oflbrake lining 98 is‘ ?xed on
bling .or removal of “the ‘pawl carriage ; and the
parts associated with.v it; 1 The housing plates
should be made of stainless steel so that their co
the opposite. side of the friction plate 98in po_
sition to engage‘ a."short” friction bar 99 disposed‘ between that strip of brake lining ‘and, a
e?icient of friction will remain, constantbefore
and-afterthe safety has :be'enin salt water spray.
1'1' The-pawl, carriage .64 isa long..channe1.—.like,
‘stainless steel block disposed, in a recess .10 formed
by the outer left-hand edges of the housing ‘plates
and their friction ?ns, (Figs 9,). It is-shcrter than
strip of brake lininglIlI'I fastened to the, friction
strip 96. The lower ends of ‘the barsg94'andr99
15
sit on the bottom plate IOI resting ,on and Welded
tothebeam
'Thefriction
Bl. strip
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96, .is
,
loosely mounted
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‘upon
.
the tubular members 85 so that itas wellas the
‘ theghousing plates and they may slide up or down 20 frictionplate 98 will remain with the pawlfcar-v
on% it in case of a safety stop. ,- Three up pointing
riage when: the pawl carriage is stopped by the
.pawls ‘II, ‘I2 and ‘I3 and three down pointing pawls
safety pawls and the continued motion of the
114', ‘I5, and ‘I6 are mounted in'the carriage body 7 platform moves the housing plates up or down
for engaging safety standards such as the notched
on the carriage. This arrangement of the pawl
portions33 of. the guide rail to stop the pawl car 25 carriage, the friction-?ns“ plate, bars and strip
riage when the cables fail.
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with the brake lining strips-disposed therebetween
The base of the down pointing pawl ‘I6 is rotat
provides a frictional resistance to brakethe move
ably-seated in a socket ‘ll in the carriage body
and, is retained in that position by a loose hinge
pini‘Ila.
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30
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Acompressionspring 88 is provided for biasing
ment of the housing stripson the pawl carriage
when .it. grips the‘ guide rails ,for absorbing the
shock of suddenly stoppingthe platform-byithe
setting of the safety pawls.
the pawl ‘18 ‘to project outwardly. The spring
~ _ s
,
Y»
A plurality of heavy friction springs are pro,
8871s concentrically mounted on a rod 8| having
its’inner; end pivotally. attached to the pawl‘ 18
by a pivot pin 82 and iscompressed between a 35
vided for pressing the friction plates, rods, ?ns,
and the carriage body tightly‘ together to in
crease their friotional resistance to a'predeter
shoulder ‘83 on the lower end of the rod 8I and
a spanner nut 84 mounted on the ,outer end of
mined amount sufficient to bring the platform to
rest within a predetermined distance after the
a tube 85; the inner end of which is seated in and
safety pawls set ‘on the guide rails. The heavy
welded to the pawl carriage 84. Eachpawl is pro
friction springs associated withthe pawl 16. bear
vided with a ?nger projection ‘I8 at its one side 49I the reference; characters I86 and I811 and ‘are
to'be engaged by a holding gate ‘I97 controlled by
concentrically mounted on the tubular support
theoperating rod vlit so that operation of the ‘rod
85 between the outer face of the friction strip 98
will open the gate to release thepawls to engage
and a round shoulder plate I88 mounted on;the
the notches 68 in the guide rails upon failure of
- outer end of the tubular support 85 and held in
one orboth-sets of cables.
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position thereon by the spanner nut 84.
.7 A temporary nut 86 is illustrated as mounted
ing the paw1,,'l6 within itsrecess ‘until thegate
that it may move longitudinally a limited distance
thereineitherydirection when the safety ‘is set to
stop the platform. v
37
r
I ,In order to provide-apredetermined frictional
resistanceto the movementof the carriage in the
housingplates, a strip" of brake lining 88 is fas
tened to the carriage 64 in, position to, engage the
adjacent face ofmthe friction ?n 65 andla strip
_.of brake lining 89is fastened to the, carriage body
in position to engage the adjacent face of the
friction 111188. A friction plate 98 is disposed
at, the other sides‘of the ?ns 65 and 68 and is
loosely mounted upon a plurality of short, round
tubular projections BI mounted in the central in
Y
shoulder vplate I08 to prevent: the spanner nut
from ‘getting loose after it is tightened on itsfrice
tion spring, The lock washer base is provided
witha pin I I I which extends into a depression in
the shoulder plate and the lock washerv is proe
vided wit-ha serrated edge, one of the projections
:19 is closedto hold thepawl. After the resetting
operation of closing the gate, the nut 86 is re- I
movedand thegate holds the pawl against the
e?ectof the biasing spring 88.‘ .Eachof the pawls
is‘, provided with ‘a similar'biasing spring. ,The
.pawl carriage 84. is shorter thanrtherejce'ss formed
by;the. housing plates in which it-isdisposed so
V ‘p
A look washer I89 and a lock washer base ,I III
are mounted between the spanner nut and, the
on the screw threaded end ofthe- rod 8| for hold
55
I12: of ‘whichis bent downwardly into a depression
in the lock support and another projection I I3 “of,
which isbent upwardly: into a notch inthe span
ning nut. after the. spanrnngnut is. tightened
ag?ilns the shoulder plate I118;v _ The compression
springs I06 and; IIl‘I_ are very; strongandjitjils
usual to use a lever arrangement‘for turning the
spanner nut 84 down against thesprings to com?
press them sufficiently against the frictionustrip
96. ‘Similar compression springs are ‘mountedin
a similar manner opposite each pawl. The “com
pression springs are so designed that they cover
practically the whole area of the compression
strip. Hence the pressure on the brake linings
willibe
. The very
holding
evenly
gate
distributed.
‘I9 (Fig. 6) ‘is
7 avrectangular
_ _
nergfaceiofgthegpawlpcarriage and welded there
to. to ‘makea solidconnection therewith so» that
framework constructed of seamless steel tubing
II5 welded together with its rear. end pivotally
mounted at the points (I I6 andI I‘! on the safety
also providedwithvholes whichper-mit it to fit over
J18 [of ‘the gate has Welded refit afeeieeselei"
vertical movement of the carriage will carry the
vfriction pl teSI) withit. The frictionplate 90 is
the tubular silrpertall‘i-
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support beams 66 and 61. The front, edge tube
2,408,761
facingstrip I‘I:9 (Fig. 9) which bears. against the
?ngers‘IB on the pawlsand holds the pawls with
in their recesses as long as the gate is in its
closed. position. When. the gate is released,ithe
pawls ?y outward-1y under the force of their com
pression springs I06 and I 0''! into engagement
with the notches 33 in the guide rails to stop
the safety.
.
is threaded through an eyelet bearing. I33 in the
frame 23, over a slide-bearing I34 onthe frame
and down to the rear end of the, trigger I35piv
otally mounted in a bearing I36 on the underside
of the cable hitch. bracket 42a. The frontendof
the trigger I 35lis~ provided with a trigger face
resting on a trigger point I31 welded to the trig
ger plate’ 58.
a
- The down pawls in thedrawings are located a
The trigger plate 58 rests loosely against the
distance apart approximately ‘equal to one and 10
lower ‘face of the cable hitch box I339 which is
two-thirds‘. of the pitch of ‘the notches- 33 in the
constructed of a plurality of metal plates welded
guide rail so that the setting of the pawls against
together and to the hitch bracket in a, box-like
the notches will stop the safety instantly or at
construction. Each of thecables I6 is pivotally
the most, where the pitch of the notches is, say,
connected by a socket I40 to the upper end of a
six inches, within a two inch travel of the safety
hitch rod I4I, the lower end of which passes
along the rail after failure of one or both sets of
through
the-hit'ch-boxv I39 and the trigger .plate 58
cables. The up pawls are also shown in the
and’
issecured
in that position ‘by a plurality of
drawings as located a distance apart equal to
nuts I42.
7
one and two-thirds of the pitch of the notches 33
A compression spring‘ I43 is mounted on each
in the guide rail so that the setting of the up 20 hitch rod and is compressed between the inner
pawls against the, notches will stop the safety
face of the top- plate on the hitch box and the
instantly or at the most within a two inch up
upper face of ‘the trigger plate. When the cables
travel of the safety along the rail after .cable
and the trigger plate are installed, the nuts I42
failure. In other words, the pawls are fraction
ally spaced apart with respect to the pitch of 25 are turned to draw the hitch rods to the point
where the trigger plate engages the underside
the notches to permit only a fractionalpitch of
of the hitch box and thereby compresses the
free fall regardless of when the safety sets.
springs I 43 until the trigger plate provides a'dead
The means'for holding the gate ‘I9 in its closed
end hitch for the cables and the springs store up
position to prevent operation of the pawls while
su?icient energy to'throw the-trigger plate down
wardly upon failure of the cables. It will be
obvious that the springs I43 should be of such
size that they will be strong enough to kick out
connected to the outer end of a lever arm I2!
the trigger plate 58 upon failure of the cables but
?xed on the operating rod 55. When the oper
will not be strong enough to‘ raise the hitch box
atingrod is rotated to cause operation of the 35 above the trigger plate.
safeties, the arm moves the rod I20 axially to
The fore end of the safety cable (Fig. 3) ex
the right and thereby moves the gate away from
tendsthrough an eyelet bearing I45in the frame
the ?ngers on the pawls, thus-releasing the pawls.
'23 and then down over a slide shoe I46 to the
the cables remain intact comprises (Fig. 5) a
holding rod I20 having its one end pivotally con
nected to the gate and its other end pivotally
.The operating rod 55 is’ a long rotatable shaft
rear end of the trigger I35a- mounted on the
extending the full length of the platform and 40 bracket
for the cable hitch'48 in association with
supported‘ in a plurality of bearings I22 on the
the trigger plate 59 as its aft end is connected
platform. The rod is made up of a plurality of
with thetrigger and trigger plate at the cable
sections with spline points at every bearing se
hitch .42.
7
curing it to the platform so that it may be ro
With thisarrangement of the safety cable, the
tated freely and easily in the event of failure of .45 failure of either set of cables-will’ release its trig
the cables without any trouble due to warping or
ger plate which, in turn, will release its trigger
weaving of the platform frame 23,
and thereby release the safety cable to release
The safety '54 at the fore vend of the platform
therarm I29 of therotating rod 55 and thereby
is‘ constructed lsv the same manner as the safety
permitthatrod to turn in its bearings under the
53 at‘ the aft end. of the platform and its gate
biasing operation of the spring 56 and thus move
I24‘ is connected by a rod I25 and a lever arm
the crank arms I21 and 126 to operate their rods
I25 to the operating rod 55 in the same manner
I211 and ‘I25 to open the gates 19 and I-24 at the
as the‘ gate 53 is connected thereto so-that op
ends of the platform, thus releasing all of the
eration of the rod’ '55 at any time will effect si
pawls simultaneously on- both of the safeties 53
multaneous operation of the pawl freeing gates
and J54't0 stop the safeties: on the notched guide
on both safeties 53‘ and 54.
rails.
The- casing 51 for the'biasing spring 56 is
A slipper or‘ bumper block I48- (Fig. 11) is
mounted on the‘ central portion of the frame 23
mounted in the outer end of each- of the beam
adjacent to the center portion of the operating
supports~63 and 61 in position to engage a plate
rod‘ 55. The spring 56> is mounted between the 60 at theside of the guide rail when the platform
bottom of the casing 51 and a push rod I21, the
may be moved end-ways an excessive distance un
‘outer end of which extends out of the casing and
der excessive’ wave shock.
is pivotally connected by a hinge joint I728 to the
As illustrated in- Fig. 10, a resetting and holding
outer end of a lever arm I23 ?xed on the-operat
bolt I50 is mounted in vertical position in the
ing rod 55 so‘that th‘e'spring 56 tends to rotate
upper‘support beam 66 to pass down through that
the rod 55 to open the pawl gates and release the
beam and through the upper end of the pawl car
pawls into the notches in the guide rails.
riage 64. The bolt is provided with suitable nuts
The means for restraining the rod against ro
by means of which the pawl carriage 64 may be
tation by the biasing spring 56 comprises» a safety
reset/torits correct position in approximately the
cable I3I extending the full length of the plat
center of the safety housing after it'has been
form with its ends connected by triggers I35 and
moved-downwardly under the-impact'of a safety
I'35a with the trigger plates and its- central por
operation and also acts as an initial resistance to
tion is threadedthrough a thimble device~~Ir3~2 on
up movement of the platform on the carriage
the outer end of the arm I29 opposite‘ the spring
during a safety stop. The bolt I50- has a cut
push rod I21. The aft end of the safety cable
away portion I5Ila to a small‘ diameter to insure
‘
' 2,408,761;
'
_
10' '
,
.
itsv failure under a predetermined strain when its
rotation
operating
I
x of the
I
U
rodimovesits leverarms
I2I andIZIB in clockwise direction v(Figs. '3, ‘Land
endof
the bolts
- thel5llrprovide>an
platfcrm’is in ‘anup-safety
initial predetermined
stop;
re
t 53 -;siinultaneously to operate theirrirods I20 ‘and
sistance to upward‘movement of either end of the
I25‘to push, the gates ‘I9 and; I'M-open simul
taneously ‘thus releasing. the ‘pawls_-into.fengage;+
platform‘ before the increased fr-ictionallresista.
ment with the notches in thelguide rails; ~
ance-comes into play in an up safety’ Stop or; up
tilting of either end of the platform.’ ~
I
E .1
The outward movement of the gate. ‘I9 moves'its
'
outer- edge II9=away from the pawl?ngers'Iil on
In the prior art the practice has been: to‘ en,-v
the'safety (-53, thereby releasing the pawls' to the‘
’deavor to equalize the, braking effect of alsafety
e?ect‘of their'b-iasing springs 80. In considering
device between a plurality'of-'rails‘with the in'-, 10 Fig, 5, it willbe assumed thatlthe down pawl ‘.16,
‘tention' of vkeeping the platform‘ level-j whenv it
comes to rest.
"
'
>
>
.1
projectsintotthe notch-shoulder?iia and thereby
stops the pawl carriage 64 onjthe guide rails} Q, ,
s
; vIn a~deck-'edge elevatorthe platform is so large,
sometimes sixty feet’ long and over‘ thirty feet
:
'asmuch as the elevator platform ,HJ, weighs,
many tons,v its down movement will suddenly
throw; an enormous load :upon :the. carria‘g”e,;~but
wide, thatv distortion‘ ‘is? almost;inevitable;- also
the unequal positioning of load iseiipeoted and _
> the frictional resistance betweenthe'?ns,onithe‘
allowable. Therefore, the“ present safetyiisii'de
housing and long lrodsheldby the housinglplates »
signed to permit theiplatform to stopvatia pre
determined maximum: amount out of leveL-gov
erned by the ‘spacing orthe distance'between the
notches for the'pawls, thestaggering of the: pawls
and the. friction plate and.‘ striprheld-vbythe‘, caré,
riage- due’ to they-brake linings‘ mounted between
them; will cushion the, down ‘movement .lof,‘ ,the
platform and housing» against the. stoppedtc’ar
, in relation thereto onthe ‘sides of‘ rails andthe
riagesu?iciently to bring the aft'end of the'ele
housing a dead stop: when : it » has passedv through
vator platform to rest on the pawl carriagewith- ,
its ‘maximum cushioning space between the cardoing any damage to the elevator structures
riage and the ‘ends of the housing GI;- The'ele: ,7 out
‘
I
It
should be’ noted that the short friction: rodv
vator in battleaction will'be able town on only
is not effective inthisoperation. ‘Thisoccurs-beT;
onecable on each'side of platform should the
cause the short-friction rod,doesnotextelnd to '
other'cables be shot away;~- sTheisafeties will 'be
the
upper ‘end-of, thehousing and, therefore,~-is
setaonlywhen allv the cables? on’ oneside- or the
not moved downwardlyjbetween ,the adjacent
other fail, and the safetiesforiboth rails will be
brakelinings;_.-~.. 1 "1 ,- 7
,~ " q .
;
‘
~, Inasmuch-.as’the gates I24 for the ;safety; 54'
set
U whenrallthe'cables
Assumed; operationon‘eithenside
of '_ the apparatus
fails: I ’ '
was opened simultaneously with thegate is on
~ It will'be assumed that the safety apparatus
has been placed in condition for operation; that is“,
all the compression springs I06 and I!!'I_,~h_ave been
compressed against the friction'strip 96 ‘by rotate
ingthe spanner nuts 84 to the necessary degree;
that the pawl restraining'gates 19 and IZA-haVe
been vpulled up against the restraining. fmge-rs'
the safety 53, .the pawl carriage-on the-safety '54
be operated simultaneously toqgrip the guide:
35 will
rail I2 and bring the fore end of-ltheelevator to:
‘rest in. thei'same manner - as they aft endmwas
brought torestq 5
‘ :If bothsets of cables breakat/the same time;
while the platform is being lowered, the safeties»
40
'18 on the paws, and are he1d9inthatpOSiii0n
I willrbe'operated in-the same manner. »
- It willbe' assumed-now‘that the hoisting see
byreasonjof the fact that-thel-triggers I3§§and
I5 are repaired and that the ‘housing engine is '
1 35a shave rbeen placed "behind tthe trigger points
I31 on the trigger plates 58 and 59; and that "all
of the temporary nuts 86 :on- thepawl-aods 18L
have been removed to permit the pawlsprings
80 to bias ~the~pawls outwardly against'theiriree -
operated to _1raise;, the platform slightly ;to release:
the pawls from‘the notches-inv the~guide1rails€
Flrst'the spanner nuts 84 are loosenedptowfree
the friction plates sorthatthevcarriage» canbe
restored to itscontrollocation at approximately»
the center of the recess. in in which it is disposed,
where it will be in its correct position for the ‘next
straining
, It will be
gates.
assumed> now that
; , the
,, we elevatorplat
_ .
,
form has been loadedand is being moved from its
upper deck to- its lower,’ deck by the,._usualopera'-V
'tion of the hoisting'engine I8 to lowerthe plat--I
safety operation. Next the temporary nuts ‘'86
are placed on the pawl rods v8 I_- andetightened ‘to
pull the. pawlsjwithin their recessesyxAfterjthe
pawls- are pulled in, the carriage is moved to» its
form..,
It will be assumed
‘
further that-the
"_“= _'-'I>
cablesqI?
central position and the spannerfnutsgare tight
enedr Next" the gates "IBYVand I24 varevvreclosed
fail by'reason of being; shot away or ‘suddenly
breaking and therebyvpernritfthemlatforml to fall
unless the safety ‘apparatus operates to stop it
an'd'support‘it'on theg‘uide'rails;
: ;‘
.7 ~:
against lithe-restraining ?ngers "I8 I on th? pawn
and the ,safety iroipe' '1 I;3I is 'again adiustedyrithe
triggers I35 and- I35a so as-to return the biasing
‘
"The; complete failure: of the » hoisting; cables - I 6
spring ‘ 56"‘ to its 1 compressed biasing. positionC in,
permits the. stored up energy in the trigger springs 69
143 (,Figi?) to “shoot”. the trigger plateSBaWay
.fror'nithe .hitch ‘base. I39 and thereby release the I ,
,
trigger. ‘I 35 .to- effect : the , release of the. stopping
pawls-landacause the platform-:toT-be stopped and '
{brought to rests-on‘ the guide rails; '
‘g "
-'
-"
‘Y
its casing 51;- After the gates-‘wand IzlI-aregre-i
turned to their,pawlrestrainingpositionsand-are
held; in suchpositions .by- the safety, rope Isl
~fastened to the triggers, which are inrturniheld by
- thetrigger plates 58 and
Salfctyrope J3! and thereby release thQitension ‘
rose from»; holding >the'gpemting _ rod-am I29 ‘
‘ against the ,pres-sureexerted by‘the biasingspring ‘
59', the temporary. nuts
88 are removedand the safety is ready for opera
- iT'he' release ,of the trigger ‘.I 35- causes its)’ rear
arm: to-?yiupwardlyunderi the tension in the
tiomagainwhenlneededt.
e
'
.>
It
'
will-begassumed
,
‘t
v-
>
>
_
I
.ow that the elevator. has
,
t
,
,
been in operation for some timeland that while
it is bein e movedlupwardly from? the ,loWer, gear
its hoisting? cables‘. I‘! ‘orjr'yithe,
fore, end {of the eleff'ator ‘are sho-t.away_and that
thatend: of the, platform starts to_.'fall. Mean
'71)»,r?llilltali?lrpgeinst the; Operating Qrod;
29
rotates nhatamin-ooapéedirection <FT1jg- ' ' while jthe'ehoistingiengine ,is‘raising', the at end
?ilingthe @asinsr?- .ZUPO'H :beingf ‘released, the
to the ?ight f deck,
biasinsspring;fringing?it?biaeing'r011,‘ 127' (Fig
Qf; the. eleyator platform 'throughjakthe {cables
2,408,761 ‘
11v '
12
When the‘ fore‘ endof the'platform started to'fall,
the broken cables I1‘ ‘permitted the trigger‘plate
'
exerted by the platform being pulled up at one
end and the force exerted by the down fallingend.
59’ to move downwardly under its energy storing
springs and: thus released the trigger i35ia to re
lease the‘ safety ‘cable l3l". The release of‘ the
cable l3! releases the‘ biasing spring 55" so that
it‘ rotates the operating rod'_55\as described in the
previous safety operation, and it, in turn, simul-'
taneously opens both‘ gates l9‘an'd I24. The re
" Although we have illustrated and'described' only
r.
one embodiment of our invention, it is to beun
derstood that changes therein and‘ modi?cations
thereof may be made without departing from the
spirit and scope of the invention.
We claim as our invention:
1. In an elevator, a platform, a hoisting means
lease of the gate‘ l 24; sets the-pawl carriage of the 10 for each end of the platform, an eng'ine'for op
safety 54‘ to be stopped: by its down pawls en~
gagingqthe notched guide rail 12 and the fore
endof the platform is‘ brought‘ to‘ rest on the pawl
carriage in the same manner as in the previously
described operation.
;
erating the hoisting means to raise or lower'the
platform, a pair of guide rails for guidingthe
platform, each of said guide rails being provided
with a notched surface, a'safety device for each
1
15 end of the platform-adjacent‘ to thelguide rails,
_ However, in ‘this accident the hoisting engine
_a frictional means connecting each safety device
is raising the platform‘ and the intact‘ cables Hi
to its end of the‘ platform to permit ifricti'onally
resisted movement of the platform onthe safety
continue to exert an upward force on the aft end
of the platform tending to tilt thepla'tform dan
gerously. This‘tilting tendencyisquicklyistopped
because the pawls of the‘ safety-53‘- are released to
engage, the notched; guide rail H. In this in
device, means mounted with. said frictional means
for‘ providing greater frictional" resistance to an
up safety stop of the platform than to a down
safety stop of the platform, a plurality or: up
stance it wi-llbe assumed that the uppawl'la'
safety pawls mounted in ‘each of" said safety ‘de
engages the notched’ shoulder 336 and thereby
vices in position for‘ engaging it's‘ notched guide
stops any further upward movement of‘ its pawl 25 rail‘, said up pawls'being fractionally spaced apart
carriage; Inasmuch as the pawl carriage is now
with respect to the pitch of the notches, in its
prevented from moving upwardly any further, the
guide rail, a plurality of down safety pawls
aft end of the platform will be stopped from any
mounted in each of said safety devices in position
further‘ upward movement and the energy in—
for engaging its notched guide rail, ‘said down
volved- in this stopping'eifect will be absorbed 30 pawls being fractionally spaced apart with re
by the failure of the bolt l5!) and by the fric
spect to the pitch ‘of the‘notchesiin its guide rail,
tional resistance between the plates carried’ by
resilient means for biasing said pawlsinto lock
the pawl carriage and the ?ns carried'by the
ing engagement with the notched portions of the
housing plates as Well as by the long friction rod
guide rails, a gate associated with‘ each of said
and the short friction rod mounted to rest on the 35 safety devices for restraining the safety pawls
bottom of the'housin-g.
'
_ '
,
thereon from engagement with the guide rail as
Inasmuch as the short friction rod is effectively
sociated therewith, an operating rod connected
used in this operation, the total frictional resist
to both of said gates, a biasing‘ means for biasing
ance‘ is greater than the frictional resistance ef
said operating rod‘ to move said gates to pawl re
fective in a down stop. This increased frictional
leasing position, a safety cable connected to said
resistance in an vup safety stop is sufficient to
operating rod to restrain it from moving the gates
take care of the up‘ pull‘ exerted by the hoisting
to their pawl-releasing positions, a hitch device
engine on the; cables l6 so that the platform is
for connecting ‘each hoisting means to :its‘end of
stoppedwithout becoming dangerously tilted up?‘
the platformj'a ‘trigger attached to each end of
Wardly at the end to which the intact cables are
attached-'.
_
the safety cable and pivotally mounted‘ adjacent a
t
' It will be assumed now that the cables" are re
paired and that the safety'apparatus is restored I
to its normal condition for thelnex‘t safety action
hitch device, a trigger plate associated with each
hitch device fer restraining operation of the trig
ger adjacent thereto and, an energy storing de
vice mounted on eaeh hitch device andrespon~
in the same‘ manner as described. in the previous 50 sive to the tension of the hoisting means attached
assumed actions.
,
'
thereto for‘ storing energy to move ‘the trigger
‘By the foregoing description’ it will be seen that
plate associated ‘with that hitch box upon ‘failure
wehave provided an improved safety apparatus
of that hoisting means to thereby release its trig
for elevators which is particularly useful‘ in con
nection- with extremely large and Iong‘hoi‘stable
bodies such-as airplane’elevator platforms, draw—
bridges, extremely heavy‘ freight‘elevatorsfetc.
ger on the safety cable and thereby cause the set_
55
ting of the p'awlsyon both safety .devices in the
notched portionsof the guide rails v‘to stop the
platform.
'
’
'
‘
‘
'
It ‘will also be observed that the safety ‘apparatus
will stopthe platform when either one or both
2. In an elevator; ‘a platform, a hoisting means
travel, and that it‘ will's'top one ‘end of the plat
form when it starts to fall during up operation
and the other end of the platform if it starts to
tilt upwardly under the up pull of the cables on
platform, each of said 'guide'rail's v“being provided
for each end' of the‘p'latform, an engine for oper
sets of cables fail during down travel‘ of the plate
(Si) ating the‘ hoisting means to .raise or lower ‘the
form, or when both‘ sets of cables fail during up
platform, a pair of guide rails for guiding the
with ‘a notched surface, a' safety device vfor ‘each
end of vthe platform adjacent to the'guideirails, a.
65 frictional means connecting" each safety device
Furthermore, if the safety is used on aneleya
to its end ofthe‘platform to'pemnitfrictionallly
resisted movement of the platform on'the'safety
tor having a set of hoisting cablesat each end,
the safety will operate simultaneously‘ atv both
jdevi‘ce, means mounted with said frictional means
for providing greater,_ frictional resistance to an
thatend.
.
y
g
‘
'
'_
_
ends foreither direction of travel regardless of 70 up safety stop of the platform than to a down
whether either one of the sets of cables breaks or
both sets of the cables break. It'will also be
observed that the safety will provide differentde¢
agrees of stopping friction for the up and the down
directions to take care of the di?'erenjce in force
‘safety stop of the platforrma plurality of'up-safee
‘ty pawls ‘mounted in each of’said safety devices in
positionv for engaging its'notched ‘guiderail, said
'up, pawls being fractionally spaced apart with
respect to therpitchof-the notches in its ‘guide
2,408,761
13v
.
7, '
114
tionqa safety "cable for restraining the operating
rod from: moving the lgates'to'theirpawl releas
ing‘positio'nsta hitch device'for connecting each
rail, a‘ plurality of downi‘safe'ty pawls mounted‘ in
each'of said safety devices in position for engag
ing its notched guiderail, said down pawls being
hoistingfm‘eans to the platform, a trigger ‘ at
f ractionally spaced apart with respect to the pitch ‘
tached to each end vof thesafety cable andrpiv
'o'tally mounted adjacent a hitch device‘, a trig
ger plate associated with each‘hitch device for 1'8?
straining operation of the trigger adjacent there
of the notches in its‘guide rail, resilient meansfor
biasing said p'awls into locking engagement with
the ‘notched portions of theguide fails, a gate as
sociated with each , of said safe'tyi devices‘for re
to,‘ and an energystoring device mounted on each
straining'the ‘safety pawls thereon'from engage
hitch idevice and responsive to the tension of the
'hoisting‘means attached thereto for storing ener
gy' to‘ move the trigger‘ plate associated with that
ment with the guide rail associated therewith,
anfope'rating' rod connected to both of said gates, ‘
a safety‘cable' connected to said operating rod to
hitch box ‘ upon failure; of: that ‘hoisting ‘means,
to‘ release its: trigger on , the safety cable and
restrain! it'from releasing the gates‘ to their pawl
vreleasing positions, a hitch device for connecting
thereby.‘ cause the setting of-the pawls on both
, ‘safeties in the‘notched portions of the guide rails
each hoisting- means to‘its‘end of the platform, ‘
a‘ trigger means connecting each‘ end of the safe
toi'stop the platform.
ty ‘cable to a hitchdevice, an energy‘storing de
vice'mounted on each hitch device and responsive
-.
-
~
7
i
1,15; :In‘an elevator, amovable platform, a hoist‘
~ ing‘means for each’ end of the platform, an engine
to ‘the tension of the hoisting means attached .
for operating the hoisting‘ means to raise or lower
thereto ‘for. storing energy tooperate the trigger
the ‘platform; a safety "element fixed adjacent to
means'associated with that'hitch box upon failure
each end of theplatformaésafety device mounted
'of'that vhoisting means for releasing the safety'
on each’ end of the-platform‘ adjacent to the safety
cable and thereby causing the setting of the pawls
‘ .elem‘entat that‘: end of .the. platform, a plurality of ‘
on both safeties in' the‘notch‘ed' portions of the
, safetypawls mountedzin said‘safeties,>resilient
guide rails'to stop‘the platform.‘ 1
'_
, ,-_ V '
,me'ansforj biasing saidpawls ‘toward locking en
v' '13.’ In an elevator, a platform, a-set ofhoisting
gagementzwith the safety elements, a gatejasso
cables'for each‘ ‘end of the ‘platform, an engine for
'ciated withae'ach of ~_-said safeties for restraining
operating’the cables to raiseor, lower‘theg-plat
’ thesafety: pawls thereon from-engagement; with
form, a pair of guide rails forguiding the .plat
form, each of said guide rails being providedwith 30 the safety' element: associated therewith,» an oper
ating rodeonnected-to said safety gates, abiasing
a notched surface, a safety device :for eachend '
means for biasing said operating rod to move said
of the platform‘ adjacent to the guide rails, a fric
gates to pawl-releasing ‘position,,~a-Ysafety cable
tional means Connecting each Safety device to its
for: restraining the ~operaiting rod, from moving
end of the platform topermit frictionally resisted
the gatesto their pawl releasing positions, a hitch
movement-of the platform‘on the safety- device,
device; fer-connecting each hoisting meansto the
means mounted with said frictional niearis‘for‘
platform, v,a trigger attached. to.-each- end 'of- the
providing greater frictional resistance‘ to an up
safety, cable - and
safety stop‘ of the platform than to a down safety
pivotally mountedv adjacent -a'
hitch device, a trigger plate associated with each '
stop‘cf the platform; apluralityof up safety
,hitchdevice for restraining operation, of the trig-.
ger adjacent thereto and, an energy storing ,deyiqe
pawls n'iounted‘i‘n each of "said ‘safetydevices in =
position for engaging its notched‘ guide rail, said, ‘
_, ounted on each hitch device and responsive .to
up‘pawls being fractionally- spaced apart with re
the tension of the hoistingmeans attached there:
, spect to the‘notches inits guide raiha'plurality of ,
to'forstoring energy’ to move-v the trigger plate
associated "with thathitch boxupon failureiof ‘
‘that, hoisting meansto, release its trigger on the
down safety pawls mounted in each of said safety ‘
devicesiin position for engaging its notched guide
rail‘, said 'down pawls being- fractionally spaced
apart with-respectlto'the notches! in its guide
‘safety, cable and thereby cause the. setting ,of the
the ‘guide rails,‘ and'means responsive:
means'for each end of the-platformanenginefor
operating the .hoisting means to raise or lower
the platform, a pairof guide rails for guiding the
rail, resilient meansffor' biasingfsaid pawls'into- ' , pawls‘on both safeties in the notched portions of
the guide rails to stop the platform,_ _
locking engagement with thenotched portions of
6.,v In an elevator, a movable platform, ahoisting
to‘: intact -
condition of the both sets of cables for restrain
' ing the safety‘ pawls from engaging the ,guide
rails and responsive to failure .of' either: set of
platform bet-ween ?oors, eachulof said .guiderails '
cables for releasing the pawls into'jengagement
with the guide rails'for ‘stopping the platform.
beingprovided, with a notched surface, a safety
devicef‘rfmounted at each :end of the platform ad‘
jace'nt ,to “the guide rails, a plurality ofvsafe‘ty
palvilsqmounted in said vsafeties, resilient, means
platform, a pair of guide rails forguiding the vj' for biasing said pawlstoward locking engagement
with the notched portions‘of the-guide rails,v a
platform between ?oors, each, of said guide rails
gat,e__associated with'each, of said safeties for .re
being providedrwith a-hotched surface; a safety
' ‘straining (‘the safety ,pawls thereon‘ from engage
"-‘4. ‘In an kalevatorQa-platform, a hoisting means
' .for‘ea’ch ‘end ‘of the platform, an engine-for, op
erating the hoisting means toraise or lower the
mounted at'eachiend of the platformadjacentto ‘ '
the‘ ‘guideurails, a ,pluralitynof. up safety pawls
mounted‘in each, of said’ safeties‘. ,a plurality
offldownusafetys pawls mounted in each“ of
said safeties, resilient means forhioiasing said
pawls toward; locking, engagement with‘ ‘the
_
I Withthe
7
‘
‘ .lment
guide railcassociated‘therewith,tin,'
'der the‘ pressure ‘of their biasing __means, an oper
"ct‘ed ‘to ‘said ga’tes',_a biasing means
65 ating rod c
for biasing
notched portions of the guide rails, a gate asso
ciated with eachof said safetiesv for restraining _ I
the safety pawls thereon from engagement “with
the ‘guide rail associated therewith, a plurality of
levers connected to said safety gates, an‘operat
ing'__rod"connecte'd to said‘ levers, a ‘biasing
'means for biasing said operating rod 1to move
saidv levers-and said gates’ to paWI-reIeasingpOsi- ‘
d4 operating" rod toimove said gates
to pawl-releasingposition,’ a safety cable'for re
straining
operating rod from moving the gates
their pawl-releasinglpositions;,and means’ re~
70 i's'p‘onsive“ toit'h'e - failure of‘ either hoisting 7' means
forrel'ea'sing ‘the safetyi‘cabl'e andthereby cau's- _
'ing the setting of the’ pawls on both. safeties in I
the‘ inot'chediiportions iofjthe 'guide .rails‘to, stop ‘
" 7'."-In-;ah:¢elevator,1 a'movableplatfomma hoist
2,408,761
15‘
15
inglfmeans for each'end of the platform, an engine
the platform,‘ a safety device, means forv mount
the safety-device ‘on the» platform, ‘a plurality
for'operating'the hoisting means to raise or lower
the platform, a safety standard ?xed adjacent to
ofv ' up ‘safety pawls pivotally, ‘mounted in the
each-lend of the platform, a safety mounted on
safety‘ device for engaging the notches in the
each end of thev platform adjacent to the safety 01 safety standard, said up pawls being fractionally
standard ther'eat, a plurality of up safety pawls
spaced apart with respect to‘ the notches inthe
mounted: in- each of said safeties for engaging its
safety standard, a ‘plurality of down safety pawls
safety standard to prevent up movement of the
pivotally'mounted, in the safety device for engag
platform, ‘ a plurality of down safety pawls
ing the'notclies inth‘e safety standard, said down
mounted in each of said safeties, for engaging its
pawlswbe'ing fractionally spaced apart withv re
safety standard to prevent down movement of
spect to the notches on the safety standard,
the'pla‘tform, means for biasing said pawls t0
means for biasing the pawls toward engagement
vrard'locking'engagement with the safety stand
with the notchesv in the safety standard, means
ards, nieans‘associated with each of said safeties
responsive to intact condition? cfthe hoisting
for restraining the safety vpawls thereon‘ from 15 cables for’ preventing the, pawlsfrom engaging
eiigagement with ‘the safety standard associated
the safety standardwand responsive to failure of
therewith, hitch devices for connecting the hoist
the ‘h'oi'stingf'cablesifor releasing the pawls into
ing-‘means to the platform, ‘and trigger means
engagementrwith the safety standard to stop'the
associated with the ‘hitch devices and responsive
platform,
slidabl‘e’friction means disposed in
to‘ intact ‘condition of the hoisting means for pre—
the‘ safety mounting means for providing fric
venting the pawl restraining means from releas
tionalresistance to movement 'of the platform on
meme pawls and responsive to failure of the
"the safety device when it engages the safety
hoisting'means at either end of the platform for
standard in making a safety stop of the platform.
causingrthe' pawlv restraining means to release '
the pawls in’tolocking engagement with the safety
‘standards to-stop the platform in either direction.
v
11. In an elevator; a platform, a ‘housing at
25 tached to the platform, a friction plate carried
by ‘the housing, a carriage,‘ a, pawl mounted "on
‘ ‘m ‘an elevating apparatus, a movable plat
the , carriage ‘T1’ or (‘engaging a safety element dur
'
ing'a safety'stop; a friction plate carried by the
carriage, an“ adjustable resilient means: for
oisting' cables for the platform a safety
standa d" provided with notches disposed adja
cent’the platform, a safety device mounted on the
moun'tin'g'the ‘carriage‘on the housing by hold-'
ing the plates in slidable frictional engagement
‘platform; a plurality of up safety pawls pivotally
mounted in the safety device for engaging the
notches in the safety standard, said up pawls
'each'other, means for. limiting the relative
movement of the plates, and an adjusting device
mo'unted‘ion'the housing and the carriage for re
being lfractionally spaced apart with respect to
the pitch of the notches in the safety ‘standard, a 35 turningthe carriage to its'p-redetermined normal
plurality of down safety pawls pivotally mounted
‘position on ‘the housing after it has been dis
in ‘the safety device for engaging the notches in
lodged therefrom in a safety operation.‘
the ‘safety standard, said down pawls being frac
tionally spaced apart with respect to the pitch
of'the notches on the safety standard, means for
biasing, the pawls toward engagement with the
notches in the safety ‘standard, and means re
sponsive to intact condition of the hoisting cables
for preventing the pawls from engaging the
'12. In an “elevator, va safety element‘, a plat
form movable along the .safetyelement, a, hous
40 ing "attached to the'pla'tform, a friction plate car
ried by'the ‘housing, a carriage, a pawl mounted
on the carriage for engaging v‘the safety element
duringa safety stop, a friction plate carried by
the carriage, and means for'mounting thev car
‘safety standards and responsive to failure of the 45 riage on" the housing-by holding the plates in
slidable frictional'engagement with each other,
‘hoisting cables for releasing the pawls into en
to ‘permit relative movement between the plat
gagementwith, the safety standard to stop the
form and‘ the‘ carriage ‘when the pawl engages
the ‘safety element.
9-. In an elevator, a movable platform, a set of
13L'In an elevator; a platform, ‘a housing at
hoisting cables for each end of the platform, a 50
tached to the platform, a'friction plate carried by
safety standard provided with notches disposed
the housing, a carriage, a pawl mounted on the
adjacent to eachend of the platform, a safety
carriage f'orengaging a safety elementduring a
device, mounted. on each end of the platform, a
safety stop, va‘fricti'on'‘plate carried by-the car
pluralityof Jup safety pawls pivotally mounted
each safety device for engaging the notches in 55 riagejan adjustable resilient means‘ for mount
ing the carriage on thehousing by holding ‘the
its safety standard, said up pawlsbeing frac
plates‘ in‘slidab'le frictional engagement with
stionally spaced apart with respect to the pitch of
each other,'- and means for limiting the relative
the notches in the safety standard, a plurality of
movement of the plates.
down safety pawls pivotally mounted in each
platform.
,
,
_
,
safety device‘ for engaging the notches in its
saffe'tyv standard, said down pawls being fraction
_ally Spaced apart withrespelct .to the notches on
itss'afety standard, means for biasing the pawls
60
l4. In a safety device ‘for an elevating means,
ain'ovable platform, hoisting cables for the plat
form, a safety standard associated with the plat
form,_ a. housing mounted on, the platform, a
toward engagement with ._.the notches in the 65 friction plat'e'__mount_ed on the housing, a safety
safety standards, and means responsive to intact
device for engaging the standard to stop the plat;
condition of both sets ofhoistingcables for pre
form, a friction plate carried by the safety de
;venting the pawls from engaging the safety
vice, n'ieans for 'fric-tionally attaching the safety
standards and responsive to failure of either set
device friction plate to the housingfriction plate
‘ofrhoistingvcables for releasing ‘all the pawls into
to permit one vto slide: on the; other and thereby
engagement with the ‘safety standard to stop
‘create frictional resistance to relativemovement
of the safety deviceand the housing and means
10. In anelevating apparatus, a movable plat
controlled by the-cables for preventing the safety
the‘plaltform;
'
'
.
-,
.
form, hoisting cables for the p1atform,-a safety
device-from grabbing the safety standard while
standardprovided v'zith notches disposed ‘adjacent 75 “the ;cables are intact and ‘for; causing the safety
2,408,761» '
-
‘1'7
deviceito-grab ‘thelsafetyl standard ‘and’; stop the
platform~iipon failure 'ofitheicables.
'?- i-f
'
1115‘, Hi a'saf'ety device for an elevating ‘means,
a movable platform, a» set of hoisting cables for
each endof the'platform,a safety standard asso
ciated with each‘end of theiplatform, a housing
mounted on ‘each end-oflthe-platform, a'frice
tion plate mounted" on'ea'ch housing, asafety de
vice for the housing at each end of the platform
for‘ engaging thej‘st'a‘ndard at that end of the
platformft'o- stopitlie'iplatform, a friction plate
carried by each safety device, means for fric
tionally attaching the friction plate of each =
safety to the friction plate on its housing to per- 7
moves downwardly‘on'the carri'agep‘a ‘carriage
slidably vdisposed in the housing, a pawl mounted-v
on? the carriage for engaging a 's'afety‘element
during a safety stop, a friction plate carriedvv by
the carriage,- and- means forvmounting'the-car-i
riage on the housing by holding the plates and
rods‘ in slidable frictional engagement with each
otherfwher'eby-the frictional resistanceicre'ated
by-upward movement or» the housing on- the'lc'ar-av ,
riage is greaterfljthan the ‘frictional resistance
created by downward movement I of ~' the housing
on the carriage.
19. In a safety mechanism for an'elevator, a
movableplatform, a set of hoisting cables at each
of the platform, a safety standard associated
mit them to slide on each other and thereby 15' end
with each end of the platform, a housing mounted
create frictional resistance to relative movement
on each end ofv the platform, a frictional plate
7 of the safety devices and the housings, means
mounted on each housing, a safety device dis
controlled by both sets of cables for preventing
posed at each end of the ‘platform for engaging
the safety devices from grabbing the safety stand
standard thereat to stop the platform, a fric
ards while both sets of cables are intact and for 20 the
tion plate carried by each safety device, means for
causing both safety devices to grab the safety
frictionally attaching the friction plate of each
standards and stop the platform upon failure of
safety device to the friction plate of the housing
either set of cables.
device at its end of the platform to create fric
16. In a safety device for an elevating means,
tional
resistance to relative movement of the
a movable platform, hoisting cables for the plat 25
housings and the safety devices, a bolt connect
form, a safety standard associated with the plat
ing the upper end of each housing to the upper
form, a housing mounted on the platform, a fric
end of the safety device associated with it, said
tion plate mounted on the housing, a safety de
bolt having a predetermined failure value when
vice for engaging the standard to stop the plat
subjected to a tension strain to prevent upward
form, a friction plate carried by the safety de
movement of the housing relative to the safety
vice, means for frictionally attaching the safety
device whereby an upward movement of one end
device friction plate to'the housing friction plate
of the platform in a safety stop will be initially
to permit one to slide on the other and there
restrained by the predetermined strength of the
by create frictional resistance to relative move
bolt and after the failure of the bolt will be fric
ment of the safety device and the housing, addi
tionally restrained by the action of ‘the friction
tional frictional means disposed in the frictional
plates, and means controlled by both sets of cables
attaching means to provide greater frictional re
for preventing the safety devices from grabbing
sistance t0 upward movement of the housing on
the safety standards while the cables are intact
the safety device than to downward movement
of the housing on the safety device, means con 40 and for causing the safety devices to grab the
safety standards for stopping theplatform upon
trolled by the cables for preventing the safety
failure of either set of cables.
device from grabbing the safety standard while
20. In a safety mechanism for an elevator, a
the cables are intact and for causing the safety
movable platform, a set of hoisting cables for the
device to grab the safety standard and stop the
platform, a safety standard associated with the
platform upon failure of the cables.
17. In an elevating
device, a movable plat-_
form, hoisting cables for the. platform, a hous
ing mounted on the platform, a safety device
associated with the housing for stopping the plat
platform, a housing mounted on the platform, a
safety device mounted on the housing with a lim
ited degree of movement therebetween, means
controlled by the cables for preventing the safety.
form upon failure of the cables, and friction 50 device from grabbing the safety standard while
the cables are intact and for causing the safety
means for mounting the safety in the housing,
device to grab the safety standard for stopping
said friction means comprising, a friction plate
the platform upon failure of the cables, a holding
mounted in the housing, a plurality of tubes hav
means connecting the housing and the safety de
ing their inner ends ?xed in the safety device,
a lfriction plate mounted on the tubes and dis 55 vice, said holding means being constructed to fail
when it is subjected to a predetermined strain
for initially preventing movement of the housing
housing, a plurality of springs mounted on the
relative to the safety device in a safety stop until
outer ends of the tubes, and means for compress
the force exerted by the housing reaches a pre- 7
ing the springs against the plates to secure a pre
determined frictional resistance between the 60 determined value, and frictional means disposed
between the housing and the safety device for
plates for braking the movement of the housing
cushioning the stopping of the housing on the
on the safety device.
safety device in the event of failure of the holding
18. In an elevator, a movable platform, a ?xed
means during a safety stop, whereby the housing
safety element disposed adjacent to the platform,
will be first prevented from movement on the
a housing attached to the platform, a long fric
safety device by the holding means'during a‘
tion rod disposed in the housing with its upper
‘safety stop and upon failure of the holding means
end and its lower end extending approximately
‘will be frictionally restrained by the friction
into engagement with the ends of the housing, a
means.
1
short friction rod disposed in the housing with
21. In a safety mechanism for an elevator, a
its lower end in approximate engagement with
movable platform, a set of hoisting cables for each
the lower end of the housing and its upper end
end of the platform, a safety standard associated
some distance from the upper end of the housing
with each end of the platform, a housing mounted
whereby it will be moved upwardly by the housing ‘
on each end of the platform, a safety device as
when the housing moves upwardly on the car
sociated with each housing for engaging the
riage but not downwardly when the housing
posed in slidablecontact with the plate in the
19
2,408,761
standard thereat to stop the platform, means
controlled by the cables for preventing the, safety
device from grabbing the safety standards while
both sets of cables are intact and for causing the
safety devices to grab’ the safety standardswhen
either set of cables fails for the purpose of stop
ping the platform upon the failure of either set
of- the cables, frictional means of a predetermined
value disposed between each housing and its safe
ty device for cushioning the stopping of the plat
form‘on that safety device in the down direction
20
by a down- setting of the safety ldeviceapandaddi
tional frictional means: disposed between each
housing and, its‘ safety device for operating in
conjunction with the ?rst-named frictional
means to provide friction of a. ‘greater predeter
mined value for cushioning the stopping of the
platform on that safety device in‘ the up direction
by‘ an up setting'of the safety device.
'
JLAMES DUNLOP. '
HANS E. HANSEN.
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