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Патент USA US2408055

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Sept. 24, 1946.
E_ w_ PENN
,
2,408,054
ELECTROMECHANICAL INTERLOCK FOR’ ELEVATOR DOORS
Filed May 13, 1945
2 Sheets-Sheet l‘
72
F594
,64
3'2
F599 \‘e"
1
Inzrentor'
[272023 l’k’Fenn
Sept. 24, 1946.
E, w_ FENN
2,403,054
ELECTROMECHANICAL INTERLOCK FOR ELEVATOR DOORS
Filed May 13, 1945
2 Sheets-Sheet 2
I
Patented Sept. 24, 1946
2,4t8,054é
UNITED STATES PATENTOFFICE
2,408,054
ELECTROMECHANICAL INTERLOCK FOR
‘
ELEVATOR DOORS
Emory W. Fenn, Chicago, Ill., assignor to Fire
craft Corporation, a corporation of Illinois
Application May 13, 1943, Serial No. 486,765
16 Claims.
(Cl. 187-—31)
1
2
This invention relates to electro-mechanical
interlocks for hoistway doors for freight elevators
Fig. 10 is a fragmentary elevational view simi
lar to Fig. 7 but with the automatic switch-open
ing means omitted, asin the case of a non-auto
matic elevator.
Referring now more particularly to the draw
and the like.
It is an object of my invention to provide an
electro-mechanical interlock which is substan
tially tamper-proof.
ings, I have shown an elevator well or shaft 20
(Fig. 9) de?ned by a wall 22 having a door open
It is a further object of my invention to provide
in connection with biparting door panels an in
terlock which cannot be rendered inoperative un
less the door suspension mechanism also is ren
ing of which the sill is shown at 215, a biparting
door 26 comprising upper and lower door panels
or sections 28 and iii, and a car 32. Attached to
the wall 22 at each side is a vertical guide mem
ber 34 to which are attached upper and lower ver
dered inoperative.
Another object is to provide a novel, simple,
compact electro-niechanical interlock mecha
tical guide members 36 and 31 providing guide
nism.
Ways 38 in which run guide angles 39 carried at
An additional object is to provide an interlock 15 the vertical edges of the door panels and forked
requiring the doors at all ?oors to be latched be
guide shoes 4!! attached as at 42 near the top and
fore the car can be started; positively preventing
bottom of each angle 39. The forks (Fig. 9) re
opening movement of all latches while the car is
ceive and move vertically relative to the respec
in motion or is not at any ?oor; and positively
tive guide members 36 and 31, shown in other
preventing opening movement of all latches eX 20 ?gures.
cept that associated with the floor at which the
Secured to the lower door section 38 as at 48
car is at rest.
is an arm 50 extending beyond said section and
It is also an object of my invention to provide
carrying adjacent‘ its free end a bracket 52
in an automatic or push-button controlled ele
through which the lower threaded end 54 of an
vator an electromechanical interlock having the
25 anchoring member 56 extends, said end 54 receiv
features noted above, and, in addition, whereby
ing a nut 53 by means of which said anchoring
the car-controlling circuit is locked open when
member may be retained and adjusted in rela
the car comes to rest at the selected ?oor and un
tion to the bracket member 52. Secured as at
til a button is pushed, and may then be closed
69 to the upper part 62 of the anchoring member
only if all doors are latched.
30 56 is a chain rod 64 whose upper end‘ is attached
Further objects and advantages of the inven
as at E6 to a ?exible suspension member such as
tion will appear as the description proceeds.
a cable chain 68 passing about a wheel or sheave
My invention will be better understood upon .
it suitably mounted as at 12 in ?xed relation to
reference to the following description and the
the guide members 355 and 36. The chain de
accompanying drawings, wherein:
35 pends from the other side of the sheave and is
Fig. 1 is a fragmentary elevational View of the
secured as at ‘M to‘ the lower part of the upper
inner face of a hoistway door and associated op
door section 28. The adjustment of the doors
erating and interlock mechanism according to my
for proper operation ofthe interlock may be
invention, a vertically sliding biparting door be
ing employed for illustrative purposes.
Fig. 2 is an elevational view taken as indicated
by the line 2—2' in Fig. l, the cover for a part of
the interlock mechanism being omitted.
modi?ed by adjustment of the nut 58.
Fig. 3 is an enlarged fragmentary elevational ‘
view taken as indicated by the line 3-—3 in Fig. 2 .
and showing details of an interlock mechanism
for a push-button controlled type elevator in ac
cordance with one form of my invention.
Fig. 4 is a fragmentary elevational View take
as indicated by the line 4—-4 in Fig. 3.-
'
Fig. 5 is a view similar to Fig. 3 but with the
interlock switch automatically opened.
Fig. 6 is a fragmentary elevational view taken
as indicated by the line E—-6 in Fig. 5.
Fig. ‘7 is similar to Fig. 3 but shows the door
latch in open position, the doors controlled by
such latch being separated.
Figs. 8 and 9 are fragmentary plan sectional
views taken as indicated by the lines 8—3 and
‘=l—-d, respectively, in Fig. '7.
Only the
40 ?exible portion '58 is in contact with the sheave
10 for all positions of the door sections 28 and 30.
When the door is closed, the sections 281 and 30
are disposed adjacent each other substantially as
shown in Fig. 1, rubber or like bumpers 16 car
ried by either section being provided at suitable
intervals between the bottom flange ‘E8 of the up
per section and the top ?ange 8B of the lower
door section 30‘.
‘
'
The doors may be latched together by any suit
able mechanism, of which an illustrative form is
shown in Fig. 1. Here,
frame 82 secured to the
door section 23, there is
84 a bell crank lever 85
preferably in a suitable
inner face of the upper
pivotally attached as at
having a handle 88 (on
the outside as well as the inside in the case of a
push-button elevator) conveniently accessible to
the operator on a car at rest at the associated
?oor level, and a second arm 98 extending in a
generally vertical direction where it is resiliently
maintained preferably as by a compression spring
2,408,654
3
.
92 disposed between an adjustable abutment 94
tion the cam will remain in a retired position.
and a lug 96 formed on the lever 86. The arm
99 is formed at its lower end with a hook or catch
When’ the car nears the selected floor, the retiring
Ilsadapted to extend through an opening I00 in
the top 85 of the lower section 39 and adapted
also, when projected through said opening I00,
cam will be automatically projected toa position
at which it operates to engage the roller I14 and
swing the arm I72 to a more nearly vertical po
'sition, thereby ‘opening the switch IE6 at the
to be moved by‘the spring 92 under and beyond . . proper time to insure the car’s coming to rest
the wall of the opening I00 as shown in Fig. 1, 7 with its floor at the level of the sill 24. The use
to which I put the retiring cam will appear pres
so as to latch the door sections together.
éntly.
.
Pivotally connected as at I02 to the lever arm
Fixed for rotation with the rock shaft I'iIl with
III) is an interlock latch bar IIM slidably guided in
in the housing IIII is a locking arm I18 urged
a block I06 suitably attached as to the angle 39- <
by a spring I80 in a direction to position the
of the door section 28. The latch bar I04 is
end I82 of the locking arm behind a locking lug
adapted to extend beyond the angle 39 and has
an offset lug IIlB adapted to cooperate with inter 15 I84 on the switch arm I'IB (Fig. 4), so as to ob
struct movement of the switch arm toward the
lock mechanism in a housing I I!) having a remov
left as shown in the drawings, 1.- e., toward open
able cover H2 and mounted as by suitable bolts,
,
switch position and prevent unlatching of -the
one‘of which is shown at II4, on the stationary
door, the locking arm I18 however being movable
guide members 34 and 36.
In accordance with my invention, there is pro 20 by the-acticnof the retiring or other cam on the
roller I14 against the resistance of said spring,
vided in, association with each landing a switch
to’ a position (Fig. 6) permitting open-switch
lever arm IIB pivoted in the housing at I25. A
movement of the switch arm H8.
I
locking bolt I22 may be connected to the lever
Also mounted for rotation with the rock shaft
I I8'in- any suitable manner, and for example may
have a slotted upstanding boss I24 pivotally con 25 I'IIJ is-a safety arm I85 which may be employed
nected as at I26 to a yoke or fork I28 on the
lever I I8. ri?he housing I II} preferably has a guide
opening I30 for sliding movement of a projection
I32 extending from the bolt I22. The bolt I22 at
in connection with a push-button controlled car,
said arm I86 carrying a cam I88 of insulation
material movable, by the action of the retiring
cam, between the contact bridge I48 and the ad
the end I34 thereof opposite the projection I32 is 30 jacent stationary contact I54 to lock- said bridge
in'open-switch position, said safety» arm being
adapted to slidingly bear on the bearing surface
urged by the spring I89 toward inoperative po
I36 of the housing III], the only other sliding
sition (Fig. 3), which it occupies upon retirement
contact between the bolt and the housing occur~
of the retiring cam. .
. .
v
ringrbetween the bottom of the opening I32 and
The housing I III has an opening I90 permitting
the bottom of the bolt extension I32, whereby .;
the bolt I22 to be projected partially out of the
friction is at a minimum. Said end I34 of the
housing, the housing being provided with a suit
bolt I22 has a notch I33 open and ?ared at the
able stop I92 e'ngageable with the lever "I I8, or
top as at I411 to facilitate entry of the lug I08 on
other suitable means being provided, to limit the
the latch bar I04 into the notch.
The lever H8 is provided with an insulating 40 extent to which the bolt I22 may be projected
fromthe housing toward the door.»
'
plate or block I42 from which projects a pin I44
When the door is open, i. e., when the door
about which a coil spring I46 is disposed, said
pin having a non-circular portion passingthrough
a metallic bridge member I48 and formed at its
free end to retain the bridge in association there- .
with, the spring I46 constantly urging the bridge
I48 toward the free end of the pin. The'bridge
Ié?rnay be'provided with electric contact points
panels 23 and-3i! are substantially apart, the latch
‘bar I94 is entirely outside of the housing III] as
may be gathered from Fig. '7, an adjustable stop
I94 (Fig. 1) being provided to limit the extent to
which the latch bar I04 may be projected by the V
latch spring’ 92,
~ I a
I59 and I52, adapted to engage respectively sta
When the doorsections are latched togethe
tionary contacts I54 and I55 mounted on an in
and the car has started on its trip, the parts are
disposed as shown in Figs. 1 to 4, wherein, refer
sulating block I58 ‘?xed to the housing I III. The
contacts I513 and I56 are in an electric circuit from
which wiring I68, suitably insulated, extends
ring particularly to Fig. 3, it will be noted that
the switch I66 is closed, the safety switch-opening
through the housing I ID to a relay I62 controlling
cam I38 is in inoperative position, and the end
the elevator car control motor I54 connected to 55 I 82 of the locking arm I18 is disposed in obstruct
the electric line. The bridge I48 with its con
ing relation to the lug I84 on the lever H8, as
tacts I55 and I52 and the points I54 and I56
shown in Fig. 4, making it impossible for'the latch
constitute a switch I66 which, with the switch
bar IE4 to be retracted. Thus it is’ impossible
I68 in series with the source of supply I6? and
to accidentally open the switch I65 when the car
controlled directly by the operator, as by push 60 is in motion and until the retiring cam on the car
button, in an automatic elevator, or otherwise
in a non-automatic elevator, controls the opera
tion of the motor relay and hence themotor.
Mounted in suitable bearings in the housing
III} is a rock shaft I'II] having an outward exten
sion to which is adjustably secured an arm I'I2
carrying a cam roller I ‘I4 adapted to cooperate
vwith a stationary cam I15 on the car if the car
operates on the roller I'I4. When the retiring cam’
thrusts the roller n4 aside (to the right in Fig. 2),
the rock shaft lit and with it the lockingarm I18
and the safety arm I86 are rotated against the re
sistance of the spring I80. This rotation of the
arm I86 causes its cam I88 to engage the adja
cent projecting portion of the contact bridge
I43, forcing said bridge against the resistance
is not push-button controlled or with a retiring
cam (not shown) with which the car, if push 70 of the spring I46 to the position shown in Fig. 5,
thereby separating the'contact I55 from the con- '
button controlled, is equipped. Referring now
tact I54 so as to open the switch I66, bringing
more particularly to the latter type of car, it is
the car 32 to a stop with its ?oor flush with the
well known that pushing any button closes a
sill 24. This rotation of ' the locking arm I13
switch I68 and this operates a solenoid to retire
the retiring cam, and if the car is put into mo 75 causes the end I82 of said arm to be shifted to a
2,408,654
position out of obstructing relation to the lug I all
of the lever arm H3, as shown in Fig. 6.
upper end 62 of the anchoring member 56 or to
the chain. rod‘ 64 thereabove, the‘ spacing of the
'
Now the operator raises the'handle 88 (Fig. l),
pulling the latch bar N34‘ to the left from its Fig.
projection I 32 from the part {52 and rod 6!! at
such times being such that accidental movement
of the locking bolt I22 into engagement with such
part and rod would be insu?icie'nt to bring about
a closure of the switch I66 even were the‘we'dge
earn I88 absent or not functioning. It will be ob‘
5 position, the ‘lug I84 moving past the locking
arm end I52 to the extent permitted by the hous~
ing Illi, as at I92, until the interlock mechanism
is arranged substantially as shown in Fig. 7 (in
which however the latch bar I04 is shown some‘
what elevated, for a purpose which will appear).
In this arrangement the contact I52 has sep
arated from the contact I56. Raising the handle
88 also moves the hook 98 laterally su?iciently
to enable it to pass‘out of the opening his of the
lower door panel 35 as the door panels 28‘ and 3d
are separated. As the door panels are separated,
the latch bar we passes upwardly out of the
notch or socket I38 and clear of the housing 5 Iii.
It will be noted that when the locking bolt I22
is withdrawn by the latch bar I04 as just de
scribed, the projection I32 on said bolt is shifted
to a position enabling the upper end 62 of the
anchoring member 56 to pass down clear of such
projection, as is evident from Fig. 7, so that the
further upward and downward movements of the
respective door panels 28 and 30 are unobstructed.
The chain rod 64 is guided by a guide element
696 suitably attached as at I98 to the housing I Iii.
The adjustable stop I 94 (Fig. 1) may be thread
ed in a bracket 2% mounted on the door panel
28 and serving as a guide for upward and down
ward movement of a gravity- or spring-actuated
detent or keeper 202 having a laterally project
ing lug 2M adapted to be accommodated in a
notch 29% in the latch bar I04. The keeper has
its lower end 268 extending through a guide
_ served that the means just described for‘ posi
10. tively preventing closure of the switch independ
ently of the wedge cam IE8 when the doors are
not latched involves‘ a substantial improvement
over the prior art, since it is dependent upon the
parts 5% and 54, the removal of either or both
15 of which would render inoperative the suspen
sion means whereby the doors are operated to
gether. Thus my construction for preventing.
closing of the switch IE6 while the door is open
is tamper—proof.
.
20
When the door panels 28 and 3d are fully open,
stop members 2 I2, of which one is shown in Fig.
9, fastened to the top of the lower door section
38, engage the sill 24‘ with a trucking plate 2| 4
at the top of said lower section substantially
25 flush with said sill.
When it is desired to proceed with the car, the
operator closes the door. As the upper door sec
tion 28 descends, the latch lug I63 rides free as
indicated in dotted lines in Fig. '7, where it is
held by the detent 264, in position to descend
into the notch I33 in the locking bolt I22, enter
ing said notch as the door panels come together.
Thus the latch bar lilll has no frictional contact
with the housingv I Hi or other part during the
opening and closing of the door. Shortly before
the door is closed, the bottom 2% of‘ the keeper
opening 2H1 in the bottom ‘I8 of the upper door
2%?2' engages the top 89’ of the lower panel 36 and,
panel 28 and adapted to rest on the top 89 of the
as the panels thereafter approach closed posi
lower door panel 38 when the door is fully closed
tions, the keeper is raised, so that the keeper lug
as shown in Fig. 1 and until the doors are sepa LIO 201i is freed of the notch 2% in the latch bar IML.
rated a slight amount, say about 1/8 inch. When
This occurs substantially when the upper end of
the operator raises the handle 38, not only is the
the latch lug I68 has passed below the top of the
hook 93 shifted laterally to an extent permitting
opening I538 in the housing Hill, the lug I238 being
it to pass through the opening I50 when the door
then disposed substantially entirely in the look
panels are separated, but the latch bar I M is , ing bolt notch 53%, the hook 9% has passed below
moved to the left (Fig. 1) until said bar is free
the lower panel flange 85], and the projection I532
of the housing IIU. At this time, the notch 206
on the locking, bolt I22 has passed below the
in the latch bar I64 is in a position to receive
upper part 62 of the anchoring member 55. The
the" lug 204 of the keeper 2% upon slight separa
compression spring 92 then automatically moves
tion of the door panels‘. When the operator raises 50' the latch bar EM, the hook 558 and the locking
the handle 88 he not only moves the‘ hook 98,
bolt I22 to the right as shown in the drawings.
latch bar HM and locking bolt I22 to open the
bringing the parts into the relation shown in
switch I85, but, as a part of- the same operation,
Fig. 5. At such time the locking lug Hill of the
he raises the upper door panel 28‘ and thus,
switch lever I I8 is spaced from the adjacent wall
through the chain 58‘ and chain rod 64, enables 55 2I6 of the housing su?iciently to permit the end
the lower panel 30 to gravitate downward‘, where
I82 of the locking arm Ill! to pass therebetw'een,
upon the notch 29% in the latch bar I04 receives
and it will be noted further that while the con
the lug 204 on the keeper 292, and thus the latch
tacts I52 and IE5 are allowed to engage, the
bar I04 is retained‘ in its retracted position until
Wedge cam I83 on the arm IE5 has prevented the
the door panels are again in such proximity that 60
contact I56 from engaging the contact I54 with
the top 30' of the lower panel 39 engages the bot
the result that the switch I65 is still open. The
tom 2138 of the keeper 202 and lifts the lug 2M
su?iciently to separate the lug from the notch
206.
operator now pushes a car control button (not
shown). Pushing of the button closes the switch
As the doors‘proceed to separate, the latch bar 65 “58 (Fig. '7) and retires the retiring cam from
the roller I14, enabling the spring I80 to rotate
lug I08 passes above the top of the housing open
the locking arm 57% until the end I82 of said
ing Hill, at which position the housing obstructs
arm is disposed between the lug IM of the switch
such movement of the latch bar IM as would
lever I 18 and the adjacent housing wall M5, said
tend to return the locking bolt I22 to switch-'
closing position. When the separation of the 70 spring thereby also rotating the rock. shaft lit!
door sections has proceeded to such an extent
and with it the wedge cam arm 586, drawing the
that the latch bar lug I03 is completely free of
wedge cam I88 out of the way of the contact
the locking bolt I26, and until the separation of
bridge Hi8, which is thereupon moved by the
the door sections is complete, the projection I32‘
spring I46 in a manner to enable the contact I50
of the‘ locking bolt I22‘ is in- juxtaposition to the
to engage the contact I54 and thereby close the
2,408,054
7
I switch I65 so as ‘to operate the relay I62 and
hence the car motor I64 to move the car,
8
necting means so as to be irremovabl'e without
rendering said connecting means inoperative.
72. In an elevator or the like, a hoistway, a
The safety wedge cam I88 is provided to sat
car in said hoistway, an electric motor for said
isfy Underwriters Laboratories requirements for
States requiringsuch a safety feature. However, 2 car, a motor control switch under the control
of the car operator, a biparting door comprising
this feature may be omitted as shown in Fig. 10,
door sections associated with each floor of said
wherein (except for the cam I88) the construc
hoistway, means connecting said sections for
tion and operation are identical with those here
simultaneous movement, latch means including
inabove set forth.
In the event the arrangement of Fig. 10 is’ 11): a movable latch member for each door, a motor
control switch associated with each door and
employed, the cam roller I14 is moved by a sta
tionary cam I'IS (Fig. 2) on the car every time
the elevator car approaches a floor, thereby mov
including a switch arm movable into closed posi- '
can raise the handle 83 to thereby retract the
movable latch member for each door, a motor
tion by said latch member when said latch mem
ber is moved to latching position, a motor control
ing the locking arm I18 to the position shown in
Fig. 6. Thus the switch I66 cannot be opened 115" circuit including said switches, said motor being
operative only when both switches are closed,
unless the car is substantially at a ?oor. The
means for preventing closure of the second switch
switch IE6 is in series with a switch controlled
when said door is open, said closure-preventing
by the operator, such as the switch I68 shown in’
means being provided on said connecting means
Fig. 7, enabling him to bring the car to a stop
at any ?oor without preselecting the floor. If, 20 so as to be irremovable without rendering said,
connecting means inoperative, and means for
after the locking arm I18 has been so shifted by
preventing opening of said second switch when
the stationary cam on the car, the operator does
said car is not at a floor.
not wish to stop the car at the adjacent floor,
3. In an elevator or the like, a hoistway, a car
the stationary cam moves past the roller I'M,
allowing the spring I80 to return the locking arm 25 in said hoistway, an electric motor for said c r,
a motor control switch under the control of the
I18 to its obstructing position as shown in Fig. 4,
car operator, a biparting door comprising door
thereby positively preventing accidental opening
. sections associated with each ?oor of said hoist
of the switch I66. If, at the time the locking arm
way, means connecting said sections for simul
I78 is shifted to the position shown in Fig. 6,
the car is brought to a stop, then the operator 30 taneous movement, latch means- including a
latch bar I534 sufficiently to withdraw the locking
control switch associated with each door and
‘ including a switch arm movable into closed posibolt I22 and thereby open the switch I66. There
tion by said latch member when said latch mem
after the switch I55 can be closed only provided
the projection I32 on the locking bolt I22 is below 35 ber is moved to latching position, a motor control
circuit including said switches, said motor being
the part 62 of the anchoring member 56, and
operative only'when both switches are closed,
the latch bar lug I918 is below the top of the
means for preventing closure of the second switch
opening I99 in the housing I II}, at which time the
door is closed. When the car is thereupon started,
the stationary cam thereon moves beyond the
roller H4, allowing the spring I89 again to move
the locking arm III! to its Fig. 4 position pre
venting opening of the switch I66.
,
'
when said door is open, said closure-preventing
means being provided on said'connecting means I
so as to be irremovable without rendering said
connecting means inoperative, means for pre
venting opening of, said second switch when said
car is not at a floor, and means including a cam
It will be apparent from the foregoing that I
on said car for rendering the second preventing
have provided a fool-proof, simple and compact 45 means inoperative when said car is at rest at a
interlock which is entirely dependable and has
all‘of the advantages herein set forth.
4. In an elevator, a ‘hoistway, a car in said
While there is shown and described herein cer
hoistway, an electric motor for said car, push
tain speci?c structure embodying the invention, 50, button control means for said motor, a door at
floor.
it will be manifest to those skilled in the art
that various modifications and rearrangements
of the parts may be made without departing from
the spirit and scope of the invention, and that
the same is not limited to the particular forms
herein disclosed, except insofar as indicated by
the appended claims.
-
‘
r
-
'
‘
each ?oor of said hoistway, a motor control
switch comprising a movable contact arm, a mo
tor control circuit including said push-button
control means and switch, said motor being op
erative only when a push-button switch and the
other switch are both closed, a latch member for
said door and operative uponsaid switch arm to
open and close said other switch, means movable
I claim:
with'said door and operative to prevent said arm
1,. In an elevator or the like, a hoistway, a
car in said hoistway, an electric motor for said 60 from closing said other switch when said door is
open, and means controlled by said car and pre~
car, a motor control switch under the control of
venting accidental closure of said other switch
the car operator, a biparting door comprising
when'said car is substantially at rest at the se- '
door sections associated with each floor of said
lected floor.
’
hoistway, means connecting said sections for
5.
In
an
elevator,
a
hoistway,
a
car
in
said
65
simultaneous movement, latch means including a
hoistway, an electric motor for said car, push-‘
movable latch member for each door, a motor con
button control means for said motor, a door at
trol switch associated with each door and in
each floor of said hoistway, a motor control
cluding a switch arm movable into closed‘ posi-}
switch comprising a movable contact arm, a mo-.
tion by said latch member when said latch mem
ber ismoved to latching position, and a motor 70 tor control‘ circuit including said push-button
control means and switch, said motor being oper
control circuit including said switches, said motor
ative only when a push-button switch and the
being operative only when both switches are
other switch are both closed, a latch member for
closed, and means for preventing closure of the
said door and operative upon said switch arm .to.
second switch when said door, is open, said closure
preventing means being‘ provided on said con 75 open and close said other switch, means movable
2,405,054
10
with said door and operative to prevent said arm
closing position, a portion of said element‘ ad
from closing said other switch when said door is
jacent said recess being disposed to obstruct
open, means controlled by said car and prevent
movement of said arm into switch-closing posi
ing accidental closure of said other switch when
tion for all open positions of said sections, and
said car is substantially at rest at the selected U! means yieldably urging said contact am into
floor, and means controlled by said car for pre—
switch-closing position when said door is closed.
venting switch-opening movement of said switch
9. In an elevator or the like, a hoistway, a car
arm when said car is not substantially at the
in said hoistway, an electric motor for said car,
selected floor.
a motor control switch under the control of the
6. In an elevator, a hoistway, a car in said ll) car operator, a biparting do'or comprising door
hoistway, an electric motor for said car, push
sections associated with each floor of said hoist
button control means for said motor, a door at
way, one of said sections having a latch member,
each floor of said hoistway, a motor control
a relatively stationary switch mounted in said
switch comprising a movable contact arm, a mo
hoistway in association with each floor and in
tor control circuit including said push-button 15 cluding a movable contact member, a motor con
control means and switch, said motor being op
trol circuit including said switches, said motor
erative only when a push-button switch and the
being operative only when said switches are
other switch are both closed, a latch member for
closed, means connecting said door sections for
said door and operative upon said switch arm to
simultaneous movement, a connecting element
open and close said other switch, means movable 20 substantially rigid with one of said sections and
with said door and operative to prevent said arm
forming an essential part of said connecting
from closing said other switch when said door is
open, means controlled by said car and prevent
ing accidental closure of said other switch when
said car is substantially at rest at the selected
floor, and means controlled by said car for pre
venting switch-opening movement of said switch
arm when said car is not substantially at the
selected floor, the last mentioned means being
inoperative when said car is substantially at the
selected floor.
'7. In an elevator or the like, a hoistway, a car
in said hoistway, an electric motor for said car,
a motor control switch under the control of the
car operator, a bipartin‘g door comprising door
sections associated with each floor of said hoist
way, one of said sections having a latch member,
a relatively stationary switch mounted in said
hoistway in association with each floor and in
cluding a movable contact member, a motor con
trol circuit including said switches, said motor
being operative only when said switches are
closed, and means connecting said door sections
for simultaneous movement, a connecting element
substantially rigid with one of said sections and
forming an essential part of said connecting
means, whereby removal of said element would
render said connecting means inoperative, said
element having a recess disposed to receive a part
carried by said arm only when said door is closed,
to permit said arm to move into switch-closing
position, a portion of said element adjacent said
recess being disposed to obstruct movement of
said arm into switch-closing position for all open
positions of said sections.
means, whereby removal of said element would
render said connecting means inoperative, said
element having a recess disposed to receive a part
carried by said arm only when said door is closed,
to permit said arm to move into switch-closing
position, a portion of said element adjacent said
recess being disposed to obstruct movement of
said arm into switch-closing position for all open
positions of said sections, and means including a
latch member for moving said contact arm into
and out of switch-closing position when said door
is closed while said car is substantially at rest
at the floor associated with said door.
10. In an elevator or the like, a hoistway, a car
in said hoistway, an electric motor for said car,
a motor control switch under the control of the
car operator, a biparting door comprising door
sections associated with each floor of said hoist
way, one of said sections having a latch member,
a relatively stationary switch‘mounted in said
hoistway in association with each ‘floor and in
cluding a movable contact member, a motor con
trol circuit including said switches, said motor
being operative ‘only when said switch-es are
closed, means connecting said door sections for
simultaneous movement, a connecting element
substantially rigid with one of said sections and
forming an essential part of said connecting
means, whereby removal of said element would
render said connecting means inoperative, said
element having a recess disposed to receive a part
carried by said arm only when said door is closed,
to permit said arm to move into switch-closing
position, a portion of said element adjacent said
recess being disposed to obstruct movement of
8. In an elevator or the like, a hoistway, a car
said arm into switch-closing position for all open‘
in said hoistway, an electric motor for said car, a
motor control switch under the control of the car
positions of said sections, means including a latch
operator, a biparting door comprising door sec
member for moving said contact arm into and
tions associated with each ?oor of said hoistway, 60 out of switch-closing position when said door is
closed while said car is substantially at rest at
one of said sections having a latch member, a
relatively stationary switch mounted in said
the floor associated with said door, and means
hoistway in association with each ?oor and in
preventing unlatching movement of said latch
cluding a movable contact member. a motor con
member when said car is not substantially at rest.
trol circuit including said switches, said motor be 65
11. In an elevator or the like, a hoistway, a car
ing operative only when said switches are closed,
in said hoistway, an electric motor for said car,
means connecting
door sections for simul~
taneous movement, a connecting element sub
stantially rigid with one of said sections and
forming an essential part of said connecting
means, whereby removal of said element would
render said connecting means inoperative, said
a motor control switch under the control of the
car operator, a biparting door comprising door
sections associated with each floor ‘of said hoist
way, one‘ of said sections having a latch member,
a relatively stationary switch mounted in said
hoistway in association with each ?oor and in
element having a recess disposed to receive a
cluding a movable contact member, a motor con
part carried by said arm only when said door is
closed, to permit said arm to move into switch
trol circuit including said switches, said motor
being operative only when said switches are
2,408,054
11
12
closed, means connecting said door sections for
simultaneous movement, a connecting element
substantially rigid with one of said sections and
for said door and connected with said switch arm
forming an essential part of said connecting
means, whereby removal of said element would
render said connecting means inoperative, said
element having a recess disposed to receive a part
carried by said arm only when said door is closed,
when said door is closed and being movable to
latching position when said car is at rest at the
associated landing, a member movably mounted
at each landing and yieldably held in a position
locking said switch arm in closed-switch position
when said door is latched, said member being
movable from such position by the retiring cam
to unlock said switch arm and against the re- .
to permit said arm. to move into switch-closing
position, a portion of said element adjacent said 10 sistance of said spring to lock said bridge in open
switch position until said cam is retired while
recess being disposed to obstruct movement of
said switch arm is in closed-switch position, said
said arm into switch-closing position for all open
latch bar being retractable, when said switch arm
positions of said sections, and means preventing
is unlocked, to unlatch said door and move said
switch-opening movement of said contact arm
switch arm to open-switch position, means for
when said car is not substantially at rest.
12.‘In an elevator, a hoistway, a car in said ,
hoistway, an electric motor for said car, push
button control means for said motor, a door at
each ?oor‘ofsaid hoistway, a motor control
switch comprising a movable contact arm and a
maintaining said latch bar inretracted position
while said door is open, means connecting said
door sections for simultaneous movement, and
means including said connecting means for look
ing said switch arm in open-switch position while
said door is open.
biased switch contact, a motor control circuit
15. In an elevator installation including, a
including said push-button control means and
hoistway having a plurality of landings with each
switch, said motor being operative only when a
of which the panels of a vertically sliding bipart
push-button switch and the other switch are both
closed, a latch member for said door and operative 25 ing hoistway door and a switch are associated, a
car having a retiring cam and disposed in said
upon said switch arm to open andclose said other
hoistway, a motor for said car, a push-button
switch, means, obstructing open-switch move
control for said motor, a motor control circuit
ment of said contact arm while said car is en
including said switchv and push-button control,
route to but substantially remote from the se
lected ?oor, and means controlled by said car and 30 said motor being operative only when said switch
and a push-button switch are closed, the ?rst
simultaneously opening said other switch and
moving said obstructing means to non-obstruct
switch having a movable arm and a spring
ing position when said car substantially reaches
the selected ?oor, said controlled means includ
pressed contact, a latch bar for said door and
connected with said switch arm when said door is
ing a member forced by said car to move said 35 closed and being movable to latching position
when said car is at rest at the associated landing,
contacttd open-switch position in opposition to
a member movably mounted at each landing and
yieldably held in a position locking said switch
arm in closed-switch position when said door is
hoistway, an electric motor for said car, push
button control means for said motor, a door at 40 latched, said member being movable from such
position by the retiring cam to unlock said switch
each floor of said hoistway,a motor control
arm and against the resistance of said spring to’
switch comprising a movable contact arm and a
lock said contact in open-switch position until
biased switch contact. a motor control circuit in
said cam is retired while said switch arm is in
cluding said push-button means and switch, said
motor being operative only when a push-button~ closed-switch position, said latch bar being re
tractable, when said switch arm is unlocked, to
switch and'the other switch are both closed, a
unlatch said door and move said switch arm to
latch member for said door and operative upon
open-switch position, means for maintaining said
said switch arm to open and close said other
latch bar in retracted position while said door is
switch, means obstructing open-switch movement
open, means connecting said door'sections for
of said contact arm while said car is en route to
simultaneous movement, and means including
but substantially remote from the selected ?oor,
said connecting means for locking said switch arm
means controlled by said car and simultaneously
in open-switch position while said door is open.
opening said other switch and moving said ob
16. In an elevator, a' hoistway, a ‘car in said
structing means to nonéobstructing position when
the bias thereon.
13. Inan elevator, a hoistway, a car in said
said car substantially reaches theselected floor,
said controlled means including a member forced
by said car to move said contact to open-switch
position in opposition to the bias thereon, and
means movable with said door to prevent said
arm from closing said switch when said door is
open.
,
,
14. In I an elevator installation including a
hoistway having a plurality of landings with each
of which the panels of a vertically sliding bipart
ing hoistway door and switch are associated, a
car having a retiringcam and disposed in said
hoistway, a motor‘ for said car, a push-button
controlyfor said motor, a motor control circuit
including said” switch. and push-button control,
,. said motor being operative only when said switch
and a push-button switch ‘are closed, the ?rst
switch having a movable arm carrying a contact
bridge, a spring pressing said bridge, a latch bar
hoistway, an electric motor for said ‘car, push
button control means for said motor, a door at
each ?oor of said hoistway, a' motor control \
switch comprising a movable contact arm, a
motor control circuit including said push-button
control means and switch, said motor being op
erative only when a push-button switch and the
other switch are both closed, a latch member for
said door and operative upon said switch arm to
open and close said other switch, means movable
with said door and operative to prevent said arm
from closing said other switch when said door is
open, means controlled by said car and prevent
ing accidental closure of said other switch when
said car is substantially at rest at the selected
floor, and means for moving the last mentioned
means to inoperative position before said car
starts.
EMORY W.. FENN.
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