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Патент USA US2408764

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Oct. 8, 1946.
T
J. DUNLOP ETAL
'
ELEVATOR
2,408,753
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Filed Dec. 29, 1943
s Sheets-Sheet 1
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WITNESSES:
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INVENTORS .
James ?an/0,0 and
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‘(e/727i: A? Piss/e7:
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Oct. 8', 1946.
2,408,763
J. DUNLOP ET AL_
ELEVATOR
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3 Sheets-Sheet 2
File'd Dec. 29, 1945
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WITNESSES:
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INVENTORS
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Ja mes Dun/0,0 mid,
Zezm/ lE Risa/e2:
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BY
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ATT ,'...
Och 8, l946-
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J. DUNLOP ETAL
2,408,763
ELEVATOR
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' Filed Dec. 29, 1943
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5 Sheets-Sheet 3
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INVENTOR 5
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Patented- Oct. 8', 1946
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damages"
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ELEVATOR»
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James _lju_nlop,.I;Ridgewood, and-"Lennie it; Rissler', f
Hohokus,,.N. J., assignors, by- mesne assign
ments, to Westinghouse Electric . Coit?oration,
7 East‘ Pittsburgh, Pa., a corporation of Pennsy1
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Vania-
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Application'December-‘29, 1943-, Serial‘No; 516,046
10 Claims.
(01.187295)
Our.‘ invention relates to elevators and more
particularly to the use of shock ‘absorbing devices
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It
also an object" to provide an elevator‘
platform safety‘ guide'shoe which. shall be simple‘
for'preventing injury to elevators.
In atypical airplane carrier ship provided with
construction; positive in operation; and whichv
may be easily manufactured; installed, and main;
a deck edge elevator for transferring." airplanes 5 tained ready for'shock' absorbing oneratio?;
to and from its ?ight decki the ?ight deck‘ overF‘oir' aibettef understanding" of the‘ invention;
hangs'the edge of the Ship about '16 'feet and out of
reference maybe had to the?accompanying draw;
this‘ overhanging part of ‘the deck. is-notched a
ings, in 'Whi‘éH 5-
sp‘ace'for' the elevatorv platform which. is about 60
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is/a View inside elevation, l"‘king'iin
feet long and 34‘ feet Wide and which weighs ap- 10 the‘ outboard direction‘ from the interior‘ of ‘a
proximately‘ ?otohs. The outboard portion of I snide:iaiIdeckeedgeeievator,embouymgour‘in;
the'platfporm extends approximately 18 feet be¢
ventien;;iiarts10fthe guide réliwbéing” SHO'WH‘ in’
wind‘ the'ov'erhanging' edge of the ?ight deck‘ ‘
Section‘,
The guide rails for-the platform are mounted on
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Fig‘. 2‘ is an enlargedview m" topi‘elevatiorii’of
the outside‘ face of the ship hull and'the- plat- 15 oneof'the guide shces'inustratedin Figi'l,
form is suspended and operated in the guide rails
Fig‘; 3 is an enlarged; View‘ in side elevation and
bya plurality of hoistingrca'bles whichlpass?ovep
partially in cros's'secti'ori of vthe; gii‘i'de'shoei'showrl’
sheaves‘ mounted on'vthe underside“ of the over-
in‘ Fig- 2'»
hanging part of thed'eck' and ‘which areattached
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Fie- 419m enlarged‘ view‘i? dross section of the
to the'fore and aft ‘ends oferthe platform.-v The 20 béndi?g'ba'l‘ti?’Fig; 3}
platform is suspendedentirely by. its hoisting‘
cables'a'nd is‘ not counterweighted.
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and
In elevators‘ of this character, many di?icult
operating conditions are encountered.‘
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' Fig‘; 5 iS a‘- VieW‘takéII 0n the li?e V—IV of Fig‘;v 3,.
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For’ in‘
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Fig.‘ 6 is a‘view taken on, the line VI-VI of
Fig. 5.
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stance; when the ship heels over 20°; the elevator 25 Althéu‘gh the i?ve?tio? iiillu'sti‘ated- iIi 0011mm"
platform may‘ be submergedin the water.- Ilfl-the
$1011 with 8- de?k-edg'é elévato? for an" airpmne
speed o‘f‘the" ship? is high,,.the water drag will
car?ersmn, it may‘ be used
Connection with
_ tend'to tear the platform o?the side of the ship.
ThBI
water drag : in the fort vand aft
any- elevetor or‘ other large body in ‘which it 'is
necessary
pl‘Otédt) 'thé
fi’dm more than
directions‘under‘such circumstancesmaybe more 30 predétél'mi?ed forcesi';
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than the guide shoes on the platform cannistand;
Referring 1110113 Specifically w the ‘drawings;
thus resultingin damage to the'guide Shoes 01:
the platform'or the elevator structure.- One object of our ‘invention-ism». provide, a
a we have illustr'ateda deck‘edge ‘elevator having
a platform “I disposed‘ between lanair of guide
rails ll and'l2 mounted on' the outside of 'a's'hip‘
shock absorbing‘mea'ns for an elevator platform 35 hull- I3‘ (only e'smell portion of whichis shown)
guiding loads‘unti'l they, reach. a predetermined
value and if the guiding'load's .inerwsebewnd
that value to absorb them with an. increasing are-
and lowered between a main. deck (not shown)
and a; ?ight deck l5 'by'a'plurality' of hoisting
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cablesl?' and" IT attached vto its‘. fore‘ and aft'ends '
sis'tan'ce and ?nally transfer themto thestrue- 40 by hitches mend 1'9. The hoisting'cables may be
ture' in‘ which theplatforni is mounted when-they
‘operated by any‘ suitable means;- ‘such' as a‘ hy
increase beyond a second predetermined value;-
' dra'ulib‘ engine‘ like that illustrated and des'cribed
Another object is to' provide a g'ui’dershoe-vfor
iii the copendin’g, application SEI‘iQLl'NO- 515,992;
elevator platforms which will safely guide the
?1'edYDe'0-23, 1943. and assigned '00 the Westingé
movementsof the platform while-it is in‘ normal 45 house‘ ‘El'ectrfc Elevator‘ Company
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operation'an'd' which will absorb. additional, forces‘
. to which the platformmay :be subjec?ed__withb?t
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being? damaged itself and iivithout permitting‘ any
name welded ‘.together'in bridgee'likeiforin' to form
damageto the ‘platform or the structure in‘ which
it operates;
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The 'iilatfonnl?' mav'be‘ constructed of seem
less ‘steeltubing, structural‘ steel sections an-d‘steel
a relatively light but strong structure 20‘.
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The‘ guide‘ rails H and I! are‘ provided.‘ with
A further‘ object‘ isftd ‘provide avguidirig means
foraship; elevator platfo'rniwhiehrwill absorb excessive ‘shocks to the'platform ,andp'ermi't it‘ to
1 settle‘slowly and'?rmly’against the ship, structui‘e without'having a battering-ram effect on the 55
channeled faces,~ 2| and‘ 22 facing each other‘ and
are mounted onbacking plates 23, 23a, 24 and
24a‘. The becldneplete's'er‘é secured to the ship
hull by‘ a plurality of horizontal brackets 25 and
z's'a. which are welded thereto to provide a strong
shin'whentheshocks'exeeed a: predetermined
value."
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support for the guidera‘ilsl
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The platform is; guided'in ‘the ‘guide rails by
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four roller type guide shoes 21, 28, 29 and 30.
platform strikes the water, the Water drag thereon
The guide shoes 27 and 29 are mounted one
above the other on the aft end of the platform
mayexert a maximum end thrust as high as
for engaging the channel 21 in the guide ‘rail
H. The .guide shoes 28 and ware‘ mounted one
be madevwhich will stand more than approxi
mately‘50,000 pounds. Hence‘ it‘ will be apparent
800,000 pounds. A practical guide shoe can not
above the other on the‘ fore end of the platform"
that it is‘not practical‘ to'build'the guides and
in position to engage the channel 22 in the guide
‘rollers strong enough to take the end thrusts and
rail l2.
particularly the twisting moment that develops
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when the platform dips into a wave when the
Referring to Figs. 3 to 6, the guide shoe 2'! com
prises a housing 32 and a side roller 33 and an 10 ship is movingwith speed.
If the guide parts
were made so that they would take all end thrusts,
end roller 34 mounted therein. The guide hous
ing is securely fastened to the platform frame
they'would be so heavy as to require a heavier
platform which, in turn would require a heavier
engine, etc., the whole construction becoming im
mounted in the upper cylindrical portion 3‘! of the 15 practical. Therefore, we have so constructed and
mounted the striking bar and the stop bar that
housing 32, so that it will run between the side»
the stop bar will bend when the end thrust ex
faces of the channel 2| to control the platform
ceeds a predetermined value and thus limit the
athwart ship. Renewable hardened steel strips 38‘
and 39 are mounted on the side-walls of the chan
stress to a predetermined amount, thatvcan be
nel to reduce the amount of wear.
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20 exerted up to the point where the excessive thrust
is taken by slipper blocks designed to withstand
The guide roller 34 is disposed to engage the
the force.
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inner face of the channel ‘2i to prevent end
The striking bar 56 is mounted on the'rear
movement of the platform and is rotatably
mounted on a pin 4| vdisposed in the forked end > end of the shank 54 by a press ?t and a pin 58.
of a round shaft 42, slidably disposed in the lower 25 The stop or bending bar 51 is disposed with its
ends resting on a pair of shoulders 59 at the sides
cylindrical portion 43 of the housing 32. _
of a depression in the inner face of the cap 46
The end roller 34 is biased into? engagement
with the inner face of the channel ‘2| by 'a'coiled _' and is secured in that position by a pair of brass
- screws 60 which pass'through its ends into the
compressionspring 44 disposed between the‘ cen
tral ‘face of'a cavity 45in the ‘rear-end of the 30 cap. When the force exerted by the platform on
the guide shoe exceeds a predetermined value,
roller shaft‘and the inner face of a ‘cap 46, which
the striking bar will be forced against the center
is mounted on the rear end of the cy1inder'43‘ by
of the bending bar and bend it into the space
a plurality of bolts 41. A similar spring is mount
6], thus relieving the strain ‘on the end roller.
ed back" of each of the other end rollers to bias
The bending bar 51 is so selected as to size
them'into c'ontact'with the guard rails'and to 35
and strength that it will bend and permit the end
centralize‘ the platform between the guide rails.
roller 34 to compress the spring 45 more than
The springs are selected with a steep character
one-eighth inch only when a predetermined dan
istic to balance the weight ofj'the platform, so
that they will absorb the normal end thrusts of ' gerous pressure tends to move the platform end
the platform.
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ways; It is also desirable to provide for increas
ing the resistance of the bending bar as the bend
The shaft 42 is prevented from rotating in the
body 32 by a ‘pair of ?ns 48 on the inner side of
ing continues. ‘Therefore, the bearing edges of
the shoulders 49 for the bending bar are rounded
the cap 45 which extend into slots 49 on the end
so that the span of the bending bar decreases at
of the shaft, so that the end roller 34 will always
it bends. After a bending action of the bending
track in a vertical direction in the channel 2|. A
pair of ‘bolts 5i and'52 pass loosely through the
bar, its condition may be readily detected by the
looseness of the end roller in operation and the
cap 45 and screw into the rear-end of the shaft‘
bent bar may be easily replaced by removing the
42'; They bolts 5| and‘ 52 are used only during
cap 46 and substituting a new bar for the old
assembly to hold the spring‘ compressed until the
platform is properly ali'ned with the guide rails. 50 one. In a given installation the rounded edge
After the platform is correctly positioned in the
may be made with a one-sixteenth inch radius
and the bending bar will reach its yield point at
guide rails, the bolts 51 and 52 are'removed and
approximately, 29,000 pounds and attain a three
watertight plugs are inserted in the holes. The
work 20 by a plurality of, bolts 35.
The side
roller 33 is mounted on a shaft ' 36 rotatably
spring is then’free to press‘ the roller against'the
rail."
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fourths inch de?ection at approximately 57,000
While these measurements‘ and weights
55 pounds.
given so far have been taken from an existing in
_ Inbrder to limit the rearward movement of
the 'end‘ roller when the end thrusts of the plat
stallation, it is to be understood that other in
stallations of this invention may vary consider
form reach a value su?icient to compress the
spring 44 a predetermined'distance, we have pro
ably in their measurments, etc., from those here
vided'a projection‘or 'shank‘54 on the rear end 60 given.
of the shaft‘ 42 ‘and tipped it with a hardened
The guide shoes 28, 29 and 30 are constructed
striking bar 56 disposed to engage a bar 57 in
in the same manner as the guide shoe 2'L'
the‘ rear end of the‘ cylinder when the end roller is
It is desirable to have the end thrust of the
forced inwardly a predetermined distance.
The
‘
platform transferred from the bending bar to the
parts are so constructed and mounted as to pro 65 ship structure as the force of the thrust ap
proaches the vlimit for which the bending bar
vide a’ normal ‘‘‘space or clearance of say one
is designed. In order to accomplish this, we have
eighth inch between the ‘striking bar and the
bending bar‘ for permitting‘that much spring I mounted a plurality of slipper blocks“, 65,‘ E6
and 61 (Fig. 1) on the platform ID in 'position'to
biased play of the end roller during normal con
ditions‘.
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70 engage the backing'plates 24' and 24a mounted on
The normal end thrusts of the platform will be
the brackets 25 and 25a at the side of the ship
taken care of by thev compression spring and
as .the bending bars reach their limits of de
the engagement of the striking bar with the stop , ?ection; The slipper blocks 64 .(Fig. 2) ,are dis?
bar. However, if the ship heels or rolls while
posed adjacent to the guide shoe2l and is mount
moving at high speedtosuch extent that-the 75 ed on the platform [0 by a beam 69 in position
areosrz'cs
it, "should; bei: understood:- that l the‘ dimensions;
toengage-the backingmlatexzllv .onithebracketsc?'
when thegendithrnstiofrithe platform ‘approaches
, weights ; vetc.,v ' noted;
per blocks? 65, ,"66. and; .61: are similar to the slipper '
block. 64 and are mounted adjacent to theguide: 5
‘ We
1;, Aclaim
guidexshoe
asour invention:
for. afplatforrn.
7 cov .- " rising’ia
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shoes 28, Y29 and 30,1 respectively by beamsJBQ'a',
housing; an end guide 'mem'berslidably: disposed
69b'and- 6900111171181 platform. frame“: The loca
tion-:of theslipperiblocks at theitpoints indicated
inthezdrawings give. them-alow leverage-err the
ship structureipso. that.~theya can withstand:.the
forcesinvolved;
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in thehousingmeans- foribiasing the guide.mem-= f
ber outwardly,~-and a bar seated ' across. a ‘pair 'ot
10
shoulders in the rear' of the housing for limiting‘
the inward movement of the: guide =memb‘er',‘"s‘aid
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bar having a predeterminedifailurepointfat which
If the platform is moving :up" or'downwhen' the
it» will be de?ecteduponthe application- offa' pll'eé
slipper blocks:engagetheplates; 2 5, they will?‘ slide
determined inward pressurev by the guide members ,
along itheiplates I Whilezresting: th'e-‘endtithrust ? of
the: platform :a'gainstgther shirt. The‘ distance-hei
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bending barsrreachrtheir greatestrresistance to
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guides-hoe for a platform comprising-a
in the housing, means for biasing the‘ guide-‘meme
be approximately, edualrto: the: de?ection of ‘they
bending;= here ‘so: thatithexend; thrusti‘of the plate
form will be transferred to the ship justias'fth'e'
2';
housing; an end guide member slida-bly '‘ disposed
tweemthe slipper block's and‘thetplates'should
the end thrust.. .
the description" are given
merely as :examplesian'dare: not- intended to limit
the application of ithe'invention in‘ any manner;
theqdeflecting limiter thezbending'baru 'I‘herslip e
m1‘ outwardly, and a bar seated across a pair‘of
shoulders in the rear of the housing for limiting
20 the inward movement of theguid'e member; said
bar having a predetermined failure point- at which
it will'be de?ected “upon the: application'iv'of ar‘pr'e
determined inward pressure by th‘eguide member;
and said shoulders having rounded beari'nged‘ges
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Fromzthe:foregoing;description, it will" be apparent. that a with the: ship"- in normal operation in
normal seas; the normal endthrusts. of the plat
form on the tend rollers in its. gui'de shoes willv be
for the bar to decreasethe span- of the bar asiit'ii’s
absorbed' by:the’,compressionsspringsl Mi- and the
springswill tend to. centralize: theplatform be‘
sistance to further deflectionv of the‘ bar;
de?ected and thereby provide an increasing re‘!
‘
3. A guide shoe for a platform comprisinfgii‘a
housing, with a! cylindrical opening, ‘an-'endguide I
tween the :guide;rails'..' litiw'ill. also be apparent
thatii an" end: thrust-10f the platform‘ reaches a
30
member slidabl'y' disposed in the cylindrical open
point where'the: striking bars thereat will engage
thebe‘ndingbars backrof them, and limit the rear
ward movement: :ofrqthe end. ‘rollers; In this case
.theforce-of theendithrust; say,‘ 11,400 pounds, vfor‘ 35
the inner end or‘ the cylindrical openin'g'?f'or um
iting the inward movement of the; guide member;
predetermined value" aticeither end: of the plat
form, it-will=compressathessprings at that end to a ,
example, is absorbed by’ the-springs.
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If, the shimzwlnle'movingiforward.at high speed,
rolls ‘over until thevplatforimvdips into, the water, 1
thesfresultingwaterdrag“may apply to thewplat-v
‘form a force: greater‘ than the end, rollers in the lilo
aft‘ guide; sho'es-v can stand Without; being dam»
agedw Assuming thatthe force-‘of the-water drag
increases beyond the predetermined forceneces
sary tel-move thel'end- rollers to their rearward
limit" and reaches a second ‘predetermined value,
say, 29,000 pounds (the- yieldpoint ‘of theibending _
ing, means for preventing-1 rotation of the guide‘
member in theop'ening; means for biasingthe
guide member‘ outwardly, an‘dia bar di'SposedFi'n
said bar having apredeterm-in'ed failure point-at
which it will be'de?ected' when the rearward
movement of’ the guide member- exceeds apre
determined value.
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4. In- an elevator, a- pair of‘ guide rails,a'-pl‘at-l
form disposed between theguide rails,‘ a guide
mounted on each end of the platform imposition
to engage the guide rail thereat forgui'ding» the
platform between the guide’ rails, a means: for
biasing each guide toward the guide rail adjacent
thereto and for absorbing» the end? thrust oritne
platformupto a predetermined'pressure, and" a
bar-under consideration); then the striking bars
substantially non-resilient bar for“ limiting-the
will. rde?ectithe bending I bars-Iand that de?ecting
rearward movement of each guide to. apredeter
action "of the bending/bars willah'sorb" much of
the forceoffthe water drag; As, the; fcrceofi the 50 mined distance when said end thrust pressurelexe
ceeds said predetermined pressure, and fonper=
water‘ drag increases, thevb'ending bars‘ willipro
vid'e an increasing resistance» to' the end thrust
of the platforms ‘because the span of'the bars. is
decreasing‘ by reason of‘the roundediedges' of'the
shoulders on which they are: mounted and thus
an increasingv absorption: of‘ the "end thrust by the
mitting a further rearward movement of that
guide onlywhen the end‘ thrustv pressure‘ exceeds a
second ‘predetermined pressure sufficient to per-1
manently deform the bar for providingiapredel
termin'ed" resistance to said further“ rearward
movement of each guide.
bendingbarsoccursl'
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‘ Assuming‘ nowlthatthe end‘ thrust created‘ by
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5'. In a deck edge elevator for a ship‘, a pair of
guide rails,v a platform disposed between: the guide
rails, a guide mounted on each end of the‘ platform
in'position:
to engage the associated’.‘guideE rail
their de?ecting limit, the slipperblocks at the
for guiding: the platform; a means associated? with
aft end "of ‘the platform :will' move into contact
the guide for absorbing the end thrust of-Tthe plate
with the backing-plate '2 4a and thus transfer‘ the
form up to ‘a predetermined‘ pressure; a bending
end thrust of the platformrto- the’ship; structure.‘
From this it, will be apparentthat we have 65 bar ‘associated with‘: the guide forabsorbingit the
end thrust of the platform when'it' eizceedsl'saifd
provided for‘ absorbing various degrees of! end
predetermined pressure up to: az second predetere
thrust forces: of‘ the platform until’ they ‘exceed-1 a
the water dragincreases still further; say,lbeyond
50,000v pounds,» then as the bending bars near
predetermined value andthat-when they exceed
that v‘predetermined value, they‘are transferred: to
_ mined pressure, and: a sli'plplat'e‘" mounted on the
I ship at each end of the platform forapplying the
the ship’ ‘structure without shock or av battering 70 unabsorbed end thrust of the plat-formic: the
ship structure'when-"the end thrust exceeds said
ram . effect bythe platform on the ship;
Although‘ we haveillustrated and described only
one specific embodiment of our invention, changes
and modi?cations therein may be made without
second predetermined pressure:
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6;‘In a deck-edge elevatorfora-‘ship; a pairrof
guide rails, a platform disposed between the guide
departing from its spirit and scope. Furthermore, 75 rails, ‘means for raising and lowering the plat
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form, an ‘upper guide shoe housingand ‘a lower
guide housing mounted one'achend of "theplat
forn'i,a guide member slidably mounted in each
guide housing, with its outer end disposed in po
sition to engage the guide rail adjacent thereto,
for guiding the platform,a biasing means mount
ed in each guide housing for biasing the guide
member thereof toward the adjacent guide rail,
and for absorbing the end thrust of the platform
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limit the rearward movement of the shaft‘and
roller when the end ‘thrust, pressure exceeds'a
predetermined value,‘ said bending'bar being ‘con
structed with a predetermined yield point so that
it may be de?ected‘ when the end thrust pressure ,
exceeds a predetermined value, and a slipper block
mounted on each end of the platform in position
to engage a portion of the ship structure when
the bending bar is deflected a predetermined dis
up to a predetermined pressure, a bending bar 10 tance for resting the platformagainst the ship
disposed on a pair of shoulders in each housing
structure when the end thrust pressure exceeds a
for limiting the, rearward movement of the guide
member when the end thrust exceeds said pre
determined pressure, said bending bar being con
predetermined
amount.
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9. In a deck edge elevator for a ship, a pairof
guide rails, a platform disposed ‘between the ‘guide
structed with a predetermined yield point so that Cl rails, an upper guide housing ‘and a lower guide
it will be de?ected when the end thrust pressure
housing mounted on each end of the platform,‘a
exceeds a second predetermined value and said
shaft slidably'disposed in each guide housing, an
shoulders having rounded bearing edges for the
end roller mounted on the outer end of each shaft
bar to'decrease its span as it bends and thereby
in- position to engage the guide rail adjacent
provide an increasing resistance to further bend 20 thereto for guiding the platform, a spring mount
ing of the bar, a plate mounted on the ship at each
ed in each guide housing for biasing the shaft
end of the platform, and a slipper block mounted
and roller thereon toward the adjacent guidevrail
on the platform in position to engage the plate
and absorbing the end thrust of the platform up
adjacent thereto when the bending bar is de
to a predetermined pressure, a striking. bar
?ected a predetermined distance for resting the 25 mounted on the rear end of each shaft, a bend-'
platform against the ship structure when the end
ing bar disposed on a pair of shoulders in reach
thrust pressure exceeds a third predetermined
pressure.
7. In a deck edge elevator for a ship, a pair of
housing for engagement by the striking bar-there
in to limit the rearward movement of the shaft
and roller when the end thrust pressure exceeds a
guide rails, a platform disposed between the guide 30 predetermined value, said bending bar being. con
rails, means for raising and lowering the plat
structed with a predetermined yield point so that
form, an upper guide shoe housing and a lower
guide, housing mounted on each end of the plat
it may bend when the end thrust pressure ex
ceeds a second predetermined value and‘ said
form, a shaft slidably disposed in each guide shoe
shoulder-s having rounded bearing edges for the
housing, an end roller mounted on the ‘outer end 35 bar to decrease the span of the bar as it bends and
of each shaft in position to engage the guide rail
thereby provide an increased resistance to further
adjacent thereto for guiding the platform, a
bending of the bar, and a slipper,‘ block mounted
spring mounted in each guide shoe housing for
on each end of the platform‘in position to engage
biasing the shaft and roller thereof toward the
a portion of the ship structure when they bending
adjacent guide rail, and for absorbing the end 40 bar is de?ected a predetermined distance for rest
thrust of the platform up to a predetermined
ing the platform against the ship structure when
pressure, a bending bar disposed on a pair of
the end thrust pressure exceeds a predetermined
shoulders in the housing for limiting the rear
ward movement of the shaft and roller until the
l0.‘ In a deck edge elevator for a ship, a-pair of
end .thrust pressure exceeds a second predeter
gulde'rails, a platform disposed between the guide
amount.
mined value, said bending bar being constructed
with a predetermined yield point so thatit may
be de?ected when the end thrust pressure exceeds
said second predetermined value, a plate mounted
on the ship at each end'of the platform, and a
slipper block mounted on each end of the plat
form in position to engage the plate adjacent
thereto when the bending bar is de?ected a pre
determined distance and thereby rest the plat
form against the ship structure when theend
thrust pressure exceeds a third predetermined
value.
8. In a deck edge elevator for a ship, a pair of
guide rails, a platform disposed between the guide
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rails, a guide housing mounted on the platform,
a guide member slidably mounted in the guide
housing, with its outer end disposed in position to
engage the guide rail adjacent thereto, for guid
ing the platform, a biasing means mounted in the
guide housing for biasing the guide member there
of toward the adjacent guide rail and for absorb
ing the end thrust of the platform up to a pre
determined pressure, a bending bar disposed on
a pair of shoulders in the housing for limiting the
rearward movement of the guide member when
the end thrust pressure exceeds a predetermined
value, said bending bar being constructed with a
predetermined yield point so that it will be de
rails, means for raising and lowering ‘the plat 60 ?ected when the end thrust pressure exceeds a
form, an upper guide housing and a lower guide
second predetermined value and said shoulders
housing mounted on each end of the platform, a
having rounded bearing edges for the bar to de
shaft slidably disposed in each guide housing, an
crease its span as it bends and thereby provide
end roller mounted on the outer end of each shaft
an increasing resistance to further bending of the
in position to engage the guide rail adjacent 65 bar, a plate mounted on the ship, and a slipper
thereto, for guiding the platform, a spring mount
block mounted on the platform in position to en
ed in each guide housing for biasing the shaft and
gagethe plate adjacent thereto when the bend—
roller thereof toward the adjacent guide rail and
ing bar is de?ected a predetermined distance for
for absorbing the end thrust of the platform up
resting‘ the platform against the ship structure
to a predetermined pressure, a striking bar 70 when the end thrust pressure exceeds a predeter
mounted on the rear end of each shaft, a bending '
mined amount.
,
bar disposed on a pair of shoulders in each hous
mg for engagement by the strikingbar therein to
JAMES DUNLOP.
_
L. R. RISSLER'. ‘
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