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Патент USA US2120081

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June 7, ‘1938.
F'iledv Jan. 2, 1935
- .
5'Sheets-Sheet_ 1
I /‘il
45 Mm!
.- flz'sizg?lexden
- June 7, 1938.'
2,120,031 ‘
Filed Jan. 2, 1935
{5 Sheets-Sheet 2 i
1571628 ji'AZexander
June .7, 1933-
Filed Jan. 2, 1935
xY“ ' i"
3 Sheets-Sheet 3
Patented June 7, 1938
Elisha E. Alexander, Chicago, Ill.
Application January 2, 1935, Serial No. 16
8‘ Claims.
This invention relates to elevator plate mecha
nisms and more particularly to a sill for spanning
the space between the floors of a building and
elevator structure.
It contemplates more especially the provision
of a sill plate that constitutes a component ,part
of the elevator cab and is within the control of
the operator to also serve as a safety feature
while the elevator is in vertical movement. With
10 the use of freight elevators, there is a constant
source of danger and accidental damage due to
the fact that the space between the ?oors of an
elevator and building structure presents much
di?‘iculty in wheeling loaded and empty trucks
ll thereover. The wheels of the trucks are caught
in the unprotected space even though the floors
of an elevator and building structure are in hori
zontal alignment, but there is even a greater haz
ard when the elevator is slightly above or below
20 the building floor landing which customarily oc
curs in the ordinary use of a freight elevator.
Then, too, most ,elevators present the hazard of
permitting loaded or unloaded, trucks to roll to
ward the wall of the building structure’ while the
This results in serious
accidents and gives rise to much damage to the
building and elevator structure to the end that
freight elevators present serious problems in
safety and accident prevention. This coupled
25 elevator is in motion.
30 with the fact that it requires great care and an
extended period of time to load and unload trucks
in connection with elevator operation, renders
it an important advantage to provide a sill that
constitutes an adjunct of the elevator and serves
85 a dual purpose of precluding the accidental _re-'
moval of loaded trucks as well as affords the
speedy displacement thereof to the building ?oor
landing when the elevator is brought to rest at
any desired floor even though actual floor align
40 ment is not accomplished, because the sill plate
will compensate for slight variations either above
or below the building ?oor landing.
One object of the present invention is to sim
plify the construction and improve the operation
45 of devices of the character mentioned.
Another object is the provision of a novel ele
vator plate mechanism that serves the dual pur
pose of' a safety expedient as well as a floor sill
v50 to bridge the gap between an elevator and build
A further object is to provide an elevator plate
mechanism that is mounted to the floor of an ele
vator so as to be capable of manipulation to serve 5
as a safety feature and as a ?oor sill.
A still further object is the provision of means
for'operating a plate mechanism between hori
zontal and vertical planes in connection with an
elevator floor for the purpose set forth.
Still a vfurther object is the provision of a floor
sill for freight elevators that‘is power operated
and is automatically controlled within predeter
mined limits of pivotal displacement. '
Other objects and advantages will appear from
the following description of an illustrative em
bodiment of the present invention.
In the drawings:
Figure 1 is a sectional view in elevation of a
building and elevator structure having a plate
mechanism embodying features of the present
vator operation.
Figure 3 is a sectional view taken substantially
along line III—III of Figure 1.
Figure 4 is a sectional view taken substantially
along line IV--1V of Figure 2. e
Figure 5 is a sectional view corresponding with
Figure 1 of a modi?ed embodiment showing the
actuating mechanism disposed beneath the ele
vator ?oor.
I Figure 6 is a conventional wiring diagram of
the controls’ utilized in actuating the plate mech
anism disclosed in Figures 1 to 5 inclusive.
Figure 7 is a view similar to Figure 5 of a still
further modi?ed embodiment of the present in
vention, it showing a simpler form of link actu 40
ating mechanism.
Figure 8 is a sectional view taken substantially
along line VIII-VIII of Figure 7.
Figure 9 is a sectional view similar to Figure 7
showing a still further modi?ed embodiment of 45
the plate actuating mechanism.
Figure 10 is a view similar to Figure 9 of still
a further modi?ed embodiment of the plate ac
tuating instrumentalities.
ing the accidental removal of trucks therefrom as
well as to serve as a floor sill to afford truck
spring mechanism operatively connected there
in conjunction with an elevator car for preclud
Figure 2 is a view similar to Figure 1 showing
the plate mechanism in a vertical position to
serve as a safety feature in conjunction with ele
Figure 11 is a view similar to Figure 7 show
ing a counterbalancing mechanism in conjunc
tion therewith to minimize the power require
ments in actuating the plate mechanism.
Figure 12 is a View similar to Figure 11 with a
ing floor structure.
Still another object is the provision of means
(Cl. 187-1)
displacement between elevator and building ?oor
with in lieu of the counterweightdisclosed in Fig
tially vertical in its extreme limit of movement,
ure 11 for the purpose set forth.
thereby allowing the doors l8 and I9 to close 1
and permit the elevators E5 to move vertically up}
Wardly or downwardly as occasions may require
Figure 13 is a fragmentary view of a hand op
erated plate actuating instrumentality for use in
connection withany'of the above‘ described em~
bodiments in lieu of the motor or other power
in the required use of the elevator l5.v »
To'this end, the plate 22 may be manually, or
power actuated to pivot between its extreme lim
' J The structure selected‘rfor illustration isshown '
in‘jassociation with a-building wall l0» having a
10 r'sub-stantially rectangular opening ~l Iv provided
> therein to de?ne a doorway orop‘eningil2 ‘to an
elevator shaft l3 where passage over the building
its of movement about the hinges 24 that serve as
a' pivot orvline of fulcrum, 23 about and consti~
tuting the rearward edge 23-of the’ p1ate‘22, As 10
shown, one or more lugs 26 are?xed to the top"
surface of the plate 22 near an end 21 and proxi- _' ' "
‘mate to the forward edge 28 thereof ‘so as‘ to pro- 7
The elevator 15 is slidably
' vide furcations 29. A link 30 is pivoted between
‘?oor I4 is necessary for ingress or egress from an.
elevator I75.
for vertical movement within the‘ shaft [3 in the
customary manner by instrumentalities of stand-v
ard'construction. To this end, the elevator l5‘is
' ‘provided with a floor 7| 6 that must-be in substan—
the iurcations 29 proximate to the extremity
‘thereof for [pivotal attachment by means of a pin
3| that extends therethrough. 'The link 30is
pivoted at its other extremity to the furcations I’ '
tial alignment with‘v the superposed building ?oors ' 32 of a crank arm 33'through the medium ofa pin'
'20 l4 constituting landings forlthe elevator ?oors [6.
Any suitable control‘ I‘! of standard, construction
34. The ‘crank arm 33_ terminates in adhubn35 2o '
that ismounted on a stub-shaft 36 that‘proj'e'cts i "
" may be mounted in the wall of the elevator 45 ~ through a-wall 31: of the elevator 15 forjournalled _ "
, ~
' to operate andweffect the ascent ordescentlof the ' supportin bearing brackets 38' and 39.“
‘elevator l5 in the customary manner. I‘ '7
f ‘The doorway or opening]? is closed to preclude
passage therethrou'gh as’ well as" to, decrease the‘
?reihazard to a minimum
a isuitableidoor of
It is to be noted'that the bearing bracketsi~38r
and 39 are ?xed to the floor iii of the‘ elevator 25
15 on bothsides of the side wall 31 thereof, ‘and
the shaft 36' projects therebeyond so asto a?ord '_ ' 4
anytype, in’ this instance there being shown ' the attachment'of a hub 40>_that~ constitutes a?
'Vmeeker door sections“! and IS-thatare guided part of a link 4|. ‘ The link 4| in turn'is pivotally;
for approach and separation in'guides‘zll mounted : connected at its other extremity to _a ‘furca‘ted
' between'the ?oors5YI'4 vandfvl6 of the building and, bracket 42 through the medium of'a pin 4'3‘,1the
elevator’ structures ill!» and >lj5’,7‘respectively; _To ' furcated bracket 42 constituting a part ofza link
' this end, there'is a space or gap 21 between the ‘44 that’ protrudes vertically downwardly for con
7 building floor'landing Mandithe adjacent end of w‘ nection to a crank arm 45. T The crank arm 45 ‘is I
the elevator floor ‘I-Bpwhich is {preferablyfcOvered'
pivotallyconnected to- the'link'l44 at itsrextremf V
' In order to bridge‘ the space or gap’ 21 between
with a hub 48 constituting a'partof the crank V
by an elevator platejmechanism‘ constituting the 7 Iities by means of a pin 46 “for actuation by an
' electric motor“ in‘that its armature is provided
subject’matter of the present; invention.
the floors I4 and‘ I6 of the buildingjandl'elevatorr 'arm'451for‘rotation therewith-in conjunction'iwith
structures; an elongated metallicjplate 22 of ‘sub
‘the motor armature shaft v49.
stantially rectangular con?guration is’ vmounted 7 It is torbe noted'that the motor.“ is-suspend'ed
by brackets 50' to the underside’ 5| of the elevator.
so that the ‘linear edge 23 thereof is infedgecon
tact with the elevatorn?ooridfor pivotal connecf "?oor 16; and in this 'manner the bulk ofS'thér '
ition thereto. This, is accomplished; in this in fmechan‘ism is ‘removed to preclude obstructionin
the ingress and egress'tovand from: the elevator a
71-45 stance,’ by means of hinges 241that arer'secured
V ‘to the plate 22'proximatejtothe ‘rearward-edge V I5." 7Any‘suitab/le 'switch'52 *may beutilizedfor '; " '
' 23 thereof, ‘and countersunk'in vthe ?oor ‘l?jas at energizing and deenergizing the motor 415 which :1":
25: for" attachment thereto to provide a pivotal vis in circuit with the power source 53; however,
connection between. theplate 22 and floor I67 in the present embodiment it is preferred to also '
50 proximate to the "threshold or edge of the. ?oor employ a limit switch '54 of standard or approved 5b
l6: thatris‘ adjacent thef?oorrlanding I4.‘ The
=trips56 and 51 that are ‘?xed to ‘the hub ‘48 con
"for substantially the entire‘widthfof the elevator.
' stituting a part of the crank arm’ 45 that rotates
floor IB'andisof a width sufficient to overlap" the '
V ?oor'edgejth'ereof and bridgejthe gap’ 2 lfforsup
port“ on jthel building: floor landing ‘ ‘7| 4" so"that
loaded or‘ unloaded trucks may be displaced there
'overfor ingress or’ egressrelative to the elevator
construction w‘hichhasa lever 55 in the pa'th‘o'f
plate‘ 22 I ispreferably ‘ of such‘length as to ' extend
1 So that thefelevator‘ rl'ooril?
perfect, alignment with'the building ‘?oor landing
'7 14 in order to effect traverse of Vloaded‘or Jin
loaded trucksithereover, the plate 22 is preferably
crowned transversely of the length thereof ‘so as
4 a to impart an iupward'or convex, curvature thereto.
with the armature shaft 49.
I -
With this arrangement, the manual; switch‘ 52
may be actuated to energize the motor 4Tfand
thereu’pontheplateZZ will be actuatedthrough
the 'linkmeans 30,733‘, 41' and ‘45 until'the ‘trip
"SF-displaces {the limitswitch lever 55 so as ‘to
break’ the circuit, thereby bringing the plate v22
lto'a :stop at ‘its extreme. limit'of movement to ~_ bridge the gap' 21 andthus enable "the-traverse '
of trucks thereover.v To elevate'theeplate 22, to
l I"
itshother extreme limit-of ~movement V-inca sub
stantially vertical direction, ther‘other {button
Itjis to'be noted that the plate '22. overlaps the ,of' the switch 52‘ is depressed so as, to again :ener
gize the motor for rotation in the opposite” di?
Whilejthe elevator ‘is at vrest at‘ a'?oorlanding, ; rection until the trip’ 51 moves; the limit'switch‘
thereby affording the use vof ‘the plate 122 ‘to lever v55 in the opposite direction to again break
confronting edges’ of thei?'oors' I74 and’ ilj?'lonly
cover the sillvand, bridge thegapl 2 l 'therebetwe'en. the circuit and thus bring the? plate ‘22'to a “posi
:In order to afford the vertical ascent or ' ‘descent tion of rest’ in a vertical upright direction to
' of the elevator I5,‘th'e plate mechanismi'n must serve'as a stop and safety guard that ‘precludes
be withdrawn’ from contact withthe'?oor landing
Y14 and preferably displaced in ojarol'ockwiser direc?
tion (viewed fromFigure'l') ‘soas‘tobesubstan
the accidental 'removalfof ‘trucks from the ele
'It is "to ‘be noted, “however, that‘the limitrsw'it'ch E75
64 need not be employed and that a manual'switch
link 44' by means of a pin 46’, and connection
' 52 resorted to for the purpose of both energizing
is eifected to the armature shaft 49’ of'the re
and de-energizing the motor 41 sov that the op
versible motor 41’ in much the same manner as
erator or attendant can gauge the entire distance
described supra. The limit switch 54’ is support
ed by means of abracket to theundersideof-the
elevator ?oor | 6' so that operation is effected and
the plate 22’ controlled in identically the manner
described in detail in connection with the pre
vious embodiments. In this particular instance,
however, the link actuating instrumentalities are
entirely removed from the interior of the elevator
it, and the 'operation'of' the plate 22' is effected
without obstructing the loading and unloading
of displacement. This merely requires the re
sort to a reversible motor 41 that is in circuit
with the switch 52 and the source of electrical
energy 53 so that the automatic limit switch 54
may be construed as optional equipment depend
ing upon the dictates of commercial practice and
the requirements of any particular installation.
It is worthy of note that the electrical circuit
includes connections to the elevator controli H
in that the lever 58 thereof has an extension 59
that is adapted to contact with a lug or raised
projection 66 comprising a part of or pressed into
a resilient bar member 6 I. The resilient member
6| has a terminal 62 ?xed to an extremity there
of, and is ?xed at its other extremity 63 for
yieldable cooperation with a stationary terminal
6% that is in circuit with the manual switch 52
and limit switch 54 so as to make and break the
circuit therethrough depending upon the position
of the control arm 56 of the elevator l5. When
the control arm 55 is in one position or'another
that is responsible for the ascent or descent of
the elevator l5, the resilient bar 6| is urged by its
own spring tension to separate the terminal 62
from the terminal 6Q in that the lever extension
56 is then out of alignment with the lug or pro
jection 66 which allows the spring member 6| to
elevate the terminal 62 out of contact with the
terminal 64.
Consequently, when the elevator is in operation
either in its ascent or descent, it will be impossible.
to energize the motor 41 that operates the plate
22 when the control arm 58 is in a neutral posi
tion that corresponds with bringing the elevator
i5 to'rest. Then the control arm extension 59
is in aligned contact with the lug 60 so as to
depress the resilient bar 6| against the urge of
its normal springing action to effect contact be
tween the terminals 62 and 64. As a result, the
circuit including the motor 47 will be closed or
capable of being closed through the manual
switch 52 so that the plate 22 may be actuated
to one position or another as may be desired. It
is to be noted that the control arm‘ extension 59
together with the resilient member 6| will be
housed or con?ned in the elevator control mech
anism ii’ to avoid exposure; however, this illus
tration on the exterior of the control housing I?
is to clarify the disclosure.
In the modi?ed embodiment disclosed in Figure
5, the plate actuating mechanism is entirely con- cealed below the elevator ?oor I6 or removed from
the interior of the elevator I5 to avoid any ob
struction in consequence of its presence as shown
in the embodiment described supra. ' In this in
stance, the plate 22’ has lugs 24' extending from
the edge 23' for extension within correspondingly
.iaped cavities 25’ provided in the floor l6’ of the
elevator l5’. As shown, the lugs 24' have trans
versely extending bores provided therein to re
ceive the shaft 36' that is journalled in bearings
38’ countersunk in the ?oor l6’ of the elevator
55'. As av result, the lugs 24’ together with the
plate 22’ rotate with the shaft 36’ that has an
extension which projects through the wall 31’ of
70 the elevator L5’ in much the same way as the pro
jection is disclosed in Figure 3.
The link ii’ is ?xed to the shaft 36' as in the
previous embodiment, and is similarly pivoted to
the link 44' by means of the pin 43’. A crank
arm 45’ is pivoted to the other extremity of the
of the elevator.
A still simpler embodiment is disclosed'in 15
Figure 7 wherein the plate mounting lugs 24”
have an extension 4|" that‘ projects through‘ a
notoh?é" provided in the floor l6” of the ele
vator l6". Another link 44" is connected to the
lug extension 6|” through the medium of a pin 120
43" that rides in an elongated slot 48" that is .
provided in its extremity. The link 44" is con
nected to a crank arm 45" through the medium of
the pin 66'’, and’ is actuated or rotatedby the
reversiblemotor M” in a manner described supra. 525
The limit switch 56" together with its co-‘operat
ing mechanism on the crank arm 45"v performs
the usual function and is’ positioned precisely as
described in the preceding embodiments.
In Figure 9, still another embodiment of the
invention takes the form of a sill plate 22a that
has the lugs 26a ?xed thereto in a manner de
scribed in connection with the embodiment dis
closed in Figure 7. Instead of the lever ex
tension AI", however, a gear sector He is ?xed
to the lugs 213a so as to' mesh with a pinion t5a
fixed to the armature shaft 498* of the reversible
motor 471*. The limit switch Me is positioned on
the motor casing 41a so that its lever 55a will be
actuated in one direction or the other by pins 56*‘ :40
and 578. that are the equivalent of the lever arm
trips correspondingly numbered and disclosed in
Figure 6. The electrical circuit is similar as that
shown and described supra, and the mechanism
is entirely concealed beneath the elevator floor
|6a so as to provide a simple and efficient struc
In Figure ‘10 a still further embodiment is dis
closed and in this instancethe plate 22b has the
lugs 24b similarto the embodiment disclosed in
Figure 7. The lug extensions Mb are, however,
longitudinally slotted as at 62*’ to serve" as a
guide for a pitman block 43*’ which is mounted
to a crank arm 45‘) through the medium of a
pivot pin 44b. The crank arm 45b is ?xed to. the?
crank shaft 49b in the manner described supra.
The crank arm 65b has an extension 55b provided
with a pin that is adapted to move in thepath
of the trips 56b and 51b of a limit switch 54*’. In
consequence thereof, the plate mechanism 22b 60
will be actuated between its extreme limits of
movement and controlled in a manner described
The crank arm 45b is rotated by the
uni-directional motor 41'’.
In Figure 11 the structure is similar to‘ that“
shown in Figure 7 with the addition of a counter
weight 660 that is slidably mounted on a lever
61°. A set screw 68° projects through the wall
of the counterweight 66c to contact the lever arm,
61c so as to afford adjustment and vary the veffect
of the weight 66° upon the plate 22°. As shown,
the lever Sic terminates in a hub 69° that a?ords
attachment to the shaft 36° to which the lugs 24¢
are attached for mounting the plate 22°. In
consequence thereof, the required power of the?
'i‘reversibleirnotorf 41° is minimized‘so as to more" lfloors'of, 'abuildingrstructure, of an elongated me; 7
economically’ effect their operation of’ the plate ' Ltallic plate extending along anedge ofsaid ele- ,
5-2‘2cland to provide for a smaller-and less expen-r vator ?oor, there beinga notch: of corresponding 7
plate olenglthjin said; elevator {floor toyreoeive ‘an ,
sive?motor' to serve that purpose.
;; VLInIQ-Ii‘igure 1-12: the‘ counterweight sec Visfsubsti—
elongated .edge" offsaid‘jplate, pivotalfmeans ,5‘
ttuted-fbyra"springi??e‘ that has one extremity
mounted; ‘said
on the
for’ attachment
of said'elevator
to said floor
thereof 1 mounted to the: floor supporting ' angle
1~iront1lld with the'other extremity ?xed to r a pin .
T'Hd'carried by' the 'lever'Mf1 that is‘connected to
named plate edge mounted'to' lie ?ush'with said'
elevator'floor, means“ for ‘displacing said metal
tlirc'plate, about said pivotal means in overlapping ‘10 '
actuate the plate-Main the manner and accord
ing to the details of construction shown in Fig
vrelationxwith the threshold of said elevator floor
to rest on abuilding‘ floor in substantially hori- ‘
‘and :enabl‘e'srthe‘u'se of a’smallermotorrthatris ' zonta-lalign-ment therewith to bridge the gap V
' "-ure?, counterbalance the Weight of the :plate 22d
less expensive and is productiveoi cheaper main ' between,‘ said; elevatorjandbuilding ?oorlstruc
tenance?" It is worthyr’of note that the motor tures, and means interposed» between said dis-715'
?imay' be"entirelyzdispensed'rwith, and that at
V I hand lever 12.» "isxsubstituted in'lieu thereof for
vconn'eéticin t'othepp‘late-ZZ‘1 through instrumen
' 4J'In angelevator struoture'having'a ,?oo'r" for
' 'talities such as described inany one, of the pre
placing means and said metallic plate to retain '~'i '
the lat-terin its extreme positions of; displace- ,
selective horizontal 1' alignment “with superposed .20
?oors of a building structure, o'f'an elongated me
tallic plate extending-along'an edge ‘of said ele
With the arrangement of parts above described,
it‘ will be apparent ‘that a single sill plate 22 is
requiredior leach elevator rather than forevery vator floor, there being a notch of corresponding
'?oorllanding,as'heretoiore provided, and that plate length inrssaidtelevat'or floor to receive'an '
125 such vc’a'nfbe utilized with greatspeed and advan ' elongated edge of said' plate, pivotal means?“ ‘7
' tage to bridge the gap 2| *between'the ?oors of a
mounted said
on the
of said elevator
said floor
last’ <
named plate edge mounted tolie flush with said :
buildingand elevatorstructure as well'as to
' serve as :a safety, expedient in itsvertically erect
elevator floor, a ,moto-r'?xed to the underside of '
position :to preclude‘ the accidental’removal of
said elevator ?oor proximate "to said’ pivotal'igo
trucks or other cargo that is being carried vby the
elevator to.its desireddestlnationvon'anyof the
means, and interenga-ging'means interposed be~ '
tween-said pivotal means and motor for displace :
7 desired ?oors l4 rofrrthe'building structure.
Various changes may be made in the'embodi- V ing said metallic plate about said pivotal means '
in overlapping relation: with the threshold" of
' ment of the'rinvention herein speci?cally de
scribed without departing'from or sacri?cing any _ said elevator i?oorrto, rest on a building '?oor P35 7
of the advantages orf'the invention as de?ned. in
the, appended claims; '
jI claimrzri
i l
the gap between
elevator ‘
and building floor vstructures.
5. In an elevator-structure 'having'a ?oor for,
1. Inl'an elevator structure‘ having a ?oor for
selective, horizontal alignment’ with superposed V selective'horizontal’ alignment with superposed;_}10 2
‘floors of abuilding structure, of an elongated 'me-V‘
floors ofabuilding structure,iof a metallic plate
'pivotally" associated with said elevator ;floor* so
tallic plate extending alongan edge of said ele
vator floor, there being a notchof corresponding’
' 'an
as to
be displaceableinoverlappinglrelation
of said elevatorY?oor'whic'h
plate length in said elevator ?oor to receive an
elongated edge of said plate, pivotal meansl45, '
metallic 'plate'to an operative ‘or inoperative posi inountedon the-underside of 'said' elevator ?oor‘ ‘ ‘
"tion respecting said'building'?oors to enable or i‘adj‘acent said ‘notch for attachment to said last,
named plate edgemQunted to lie flush with said
j preclude the movement of trucks from one struc
elevator vfloor,v Valrnotor v?xed to the underside of ‘tureito thejother, structure,’ means ‘for counter
balancin'gfsaidr-plate so as to minimize ‘the re-'
said elevator, floor, proximate to said} pivotalja'm" '
xquired"power for e?ecting ‘plate'displacement,
means; and link means ‘interposedlbetweenvsaid‘ ':~ 1 1; '
and lever crankmeans operatively connected to: pivotal means and motor for displacing said Vme
said link means, said lever crank means-and link tallic plate about said pivotal means ‘in overlap?
ping relation with the thresholdof said elevator
' ?oor to rest "on a building ‘,iloor inv substantially, 55
in its ‘extreme positions 'of movement.
2. In an elevator structure’ having a ?oor for horizontal alignment therewith, thereby bridging?
means ‘being so connected as to, retain said-plate
'selective horizontal alignment‘ with superposed '7 the .gapvbetween said elevator and building floor
‘ ?oors of a building structure; of a ‘metallic plate ,
pivotallyv associated with said elevator ?oor so as
to be displaceable in-overlapping relation with an
edge of said elevator floor ‘which is adjacent a
6. In an ‘elevator structurehaving a floor for ‘,
selectivehorizontal alignment with superposedqm')
.?oors of a ‘building structure, of anrelongatedk’i'
metallic .plate extending along ‘an edgef'of ‘said .
' building. floor, link means for displacingsaid me
vele'vator?oo-r, there being'anotch of‘corr'espond- I ‘
tallic plate ‘to an operative -or inoperative posi
tion respecting said building vfloors to enable or' ] ingf plate length in saidrelevator floor to receive 7 ' 7' ~
:65 preclude the ‘movement of'trucks from v‘one struc- an elongated edge'of said plate," pivotal meansr'lazi ] ' '
"mounted on the underside of said elevator, ?oor'l"
.turelto the other structure, ~me_ans~ for counter
balancing said plate ‘so as tojminimize the ~re- '
adjacent said. notch "for attachment'fto said last
,‘quired'powerfor-e?ecting Yplate displacement, a lnamed’plate'edge mountedyto» lie flush with said’ ,
motor operatively connected ‘to said-link ‘means elevator floor, a motor ‘fixed to the underside of '
‘for 'imparting'movement we said plate, and limit 7 ‘said elevator floor proximate to said‘ pivotal?qo '
means,rand interengaging gear means interposed“
, vswitches onsaid motor for automatically govern
between said‘pivotal means and motor for dis
ing'the operation of said ‘plate within predeter
_ ‘3. In an elevatorfstructure' having‘ a ‘floor for
selective‘ vhorizontal alignment with’ superposed
_-placing- said Vmetallic plate about said pivotal
;—means in‘ overlapping relation with the threshold
of saidéelevato'r floor to restron arbuilding 110011155 , V
in substantially horizontal alignment therewith,
selective horizontal alignment with superposed
thereby bridging the gap between said elevator
and building ?oor structures.
7. In an elevator structure having ‘a floor for
selective horizontal alignment with superposed
floors of a building structure, of an elongated me
tallic plate extending along an edge of said ele
vator floor, there being a notch of corresponding
plate length in said elevator floor to receive an
elongated edge of said plate, pivotal means mount
ed on the underside of said elevator ?oor adja
cent said notch for attachment to said last named
floors of a building structure, of an elongated me
tallic plate extending along an edge of said ele
vator floor, there being a notch of corresponding
plate length in said elevator floor to receive an
10 elongated edge of said plate, pivotal means
mounted on the underside of said elevator floor
adjacent said notch for attachment to said last
named plate edge mounted to lie flush with said
elevator floor, a motor ?xed to the underside of,
15 said elevator ?oor proximate to said pivotal
means, link means interposed between said piv
otal means and motor for displacing said metallic
plate about said pivotal means in overlapping re
lation with the threshold of said elevator ?oor to
rest on a building floor in substantially horizon
tal alignment therewith, thereby bridging the gap
between said elevator and building ?oor struc
tures, and means for counter-balancing the grav
ity urge on said plate to minimize the required
power for rendering operative said motor.
8. In an elevator structure having a floor for
plate edge mounted to lie flush with said elevator '
?oor, a motor ?xed to the underside of said ele 10
vator floor proximate to said pivotal means, link
means interposed between said pivotal means and
motor for displacing said metallic plate about
said pivotal means in overlapping relation with
the threshold of said elevator floor to rest on a 15
building ?oor in substantially horizontal align
ment therewith, thereby bridging the gap be
tween said elevator and building ?oor structures,
means for counter-balancing the gravity urge
on said plate to minimize the required power for 20
rendering operative said motor, and limit switches
operatively connected to said motor to automati
cally govern the predetermined limit of plate dis
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