US1709970A

US1709970A - Elevator interlock

Info

Publication number: US1709970A
Application number: US207135A
Authority: US
Inventors: John A Brubaker
Original assignee: Haughton Elevator and Machine Co
Current assignee: Schindler Haughton Elevator Corp
Priority date: 1927-07-20
Filing date: 1927-07-20
Publication date: 1929-04-23
Anticipated expiration: 1946-04-23

Description

April 3, 1929. J. A. BRUBAKER 1,709,970

ELEVATOR INTE'RLOCK Filed July 20, 1927 Patented Apr. 23, 1929.

Join: A. BRUBAXEB, or 'ro nno, oiiIo, ASSIGNOB 1 0 THE nAnen'ron n'LEVA'ronAnn MACHINE COMPANY, OF TOLEDO,

onIo, A oonronzirion or OHIO.

ELEVATQR EDITH-BLOCK.

Application filed July '20,

tioning of the interlock depends upona small spring, and il 'this spring is broken or fails to act as intended, the door can be opened when lhecai' is not there. BTOYOOVGI, with the interlock. stopped.- below the floor, the door may be. opened manuallyfrom. the inside of the car, without locking the carv against starting. Such conditionsare very dangerous, and it is with the object of correcting same that the present invention has been perfected.

l he objects and advantages of the invention will be more specifically explained in connectic-n win] the accompanying drawing which illustrates one embodiment thereof v in the drawing 1'' "Figure 1 represents the invention in elevation as viewed from the inside of the shaft, the cover of the lock casing being removed.

Fig. 2 is a sectional view taken on the line 22 ofFig. 1.

in itsipresent embodiment, the invention is. shown in connection with a sliding door 5 having a horizontal bar 6' secured thereto and projectingbeyond the edgeioli the door where it terminates in. a hook 7. p A lock casing. 8 :is mounted on the side of the-elevator shaft Hit spaced from the door amb '9 a suificient distance so that the interlocking mechanism will be clear of the corner of the T he hook 7, the door closes, is adaptedito engage in: a recess 10 formed in a tumbler 11 mounted on a stud 12 extending from the bottom of the casingS. The tumbler is held against iinoveinentlengthwise ot-the stud 12 1 by a pin 13 or the like. A latch 14 is pivotally mounted on a spindle'15 secured in the lower part of the casing S'and its upperend 16 is adapted to cooperate with a projection 17 on the tumbler '11 to lock the latter againstrocation, thereby locking the door 5 in closed position. I

The center 0t of the latch 14 at functioning normally, it the car 1527. Serial No. 207,135;

side of the spindle 15 so'that the latch may he held in looking position gravity alone. It is preferred, however, to provide a coil. spring 18 whichalso'tends t0 hol'd'the latch in 7 locking. position. This spring is mounted on a stem 19 which projects from the V l aeltoi'the easing 8 through anea'r-QO formed on the latch 14 and the ste1n19 is provided at [i is outer end with a head 21' against which the spring 18 is Seated.

Vi hcn the elevator car stops in a position opposite the doorway, thelatch 14 is adapted to be withdrawn froni behind pr0jection-17 ot' the tumbler so as to permit the door to open. To el'l'ect this operation an angular arni. 22 is secured to the lower end of the latch 14 and carries a roller 3 at its lower end which is engage'able by a retiring cam 24carried by the elevator car 25. The arm 22 is mounted on a pivot bolt26 and has a pin and slot connection Q'Twith the lower. end of the latch 14 so that it maybe adjusted to the position of the can}. V I

The interlock device may be used in connection-with a retiring cain oi'any suitable construction. By way of. illustration, the

cam 24 is fillOWl'lJiLS carried by links QSpivote ed to thejside oi the car 25. A solenoid core 29 is pivotally connected to the upper end of the cam 24 and when the coil3O is energized the 021111 24-is held in retired. position so as not

wires

33 and 34 which are connected respectivel'y to bars 35"and 36 of conductive 1113- term]. mounted on-an insulat ng base--37 secured to the backof the casing 8, An in'sulating bar 38 is secured tothelatch 14 andgcarries at its enda contact 3 9 which is electricah ly connected to thebar 35 by a flexible eon ductor'4-O." As soon as the latch 14 is released I and permitted to niove into lockingposition under the influenceot gravity'or the spring 18, the contact 39 engagesbar 36 and a circuit is established tro1n=thewire 33 through her 35,.conductor 40,: contact 39, bar 36, to' the.

. to engage tlie'roller 23. l Vhen' the coil 30'is lead wire 34. N otl until the door is locked I and the contact 39' closed, can thefcircuit through the car operating motor be' estab-' position so that the latch 14 is in position to lockthe door. The coil 30 willbe de-energized and permit the cam 24 to drop only after the current which operates the car is turned If the car stops in proper position opposite the door, the cam 24, as it comes forward, strikes the roller 23 and moves the latch14 to unlock the door, at the same time opening the circuit throughthe contact 39 and making it impossible to run the car again until the circuit is closed.

' lVhen the door is opened, the'hook 7 rotates the tumbler 11 and the portion 44 of the tumbler passes underneath the end 16 of the latch and prevents the latter from being moved to-close the circuit through the car operating motor until the tumbler 11 has been returned by the closing of the door. When the door is opened the weight of the larger portion 44 of the tumbler holds it in position to prevent the contact 39 from being closed and in position to receive the hook 7 as the door is. closed again.

, It will be seen, therefore, that the car cannot leave afloor until the door is clos d and mechanically locked. It isdiilicult to, tamper with the lock 'or toputit out of commission since the tumbleris diflicult to roll except by the means provided for the purpose and will always drop by gravity to unlocked,

positionit not held. The locking device may be easily installed since it does notJrequire any close or accurate seating.

v If any person, by unauthorized tampering with the lock, should succeed in rolling the tumblerto lockinglposition, while the door 'is' open, and, in holding the tumbler in that position while someone pushes the button and starts the car, the weight of the portion 44 will nevertheless, assoon as the car again stops at that floor, cause the position of the tumbler to be rectified so that the normal operation of the lock will be restored.

Itwill be obvious that the lock may be used either on swinging. doors or sliding doors It may be reversed for either right hand or left hand operation by reversing the position of the tumbler 11 on the stud 12. Of course, a suitable key may be provided for unlocking the door in Tease of emergency.

' While the'spring 18 isprovided to assist in holding the latch 14 in locking position, the

latch is so balanced that it the spring should break or become lost the latch will still be operated by gravity.

lVhile I have shown and described in considerable detail one specific embodiment of the invention it is to be understood that this is merely for the purpose of illustration and that various modifications may be made therein without departing from the scope of the invention as defined in the claims.

vVhat I claim is:

1. In an elevator interlock, the combination with a baradapted to be attached to a door and having a hook thereon, of a casing with a tumbler rotatably mounted therein and having a. recess for receiving said hook, a projection on said tumbler, a latch mounted so as to be movable by gravity into position behind said projection to lock the door when closed, and gravity actuated means operable to withdraw said latch out of the path of said projection only when the car is opposite the door. p

2. In an elevator interlock, the combinat1on with a bar adapted to be attached to a door so as to project therefrom, said bar vterinlnating n a hook, of a casing with a tumbler rotatably mounted-therein and having a recess tor receiving said hook, a projection on said tumbler, a latch, spring means acting upon the latch to move the same into positionbehind the projection'to lockthe door when closed, saidlatch being so mounted that it ismovable into locking position by gravity if the spring means fails, an operating arm connected with said latch, a retiring cam, and means operable tocause said cam, in connection with said operating arm, to withdraw said-latch out of the path of said projection only when the car is oppositethe door. V V

3. In an elevator interlock, the combination with a bar adapted'to be attached to a door so as to project theretro msaid bar terminating in a hook, or a .fixcd'casi'ng, a tumbler rotatably mountedtherein and having a recess in its periphery adapted to receive said hook,; means positively preventing movement oi said tumbler lengthwise of its axis,

a radial projectionen saidv tumbler, a latch having an end movable by gravity trans versely into the path of said projection behind the same to lock the tumbler and thereby lock the door-'when'closed, an, operatingarm connected with said latch, aretiringcam, and means operable to cause said cam, in connection with said operating arm, to withdraw saidlatch out of the path ofsaid projection onlywhen the ear is opposite thedoor.

.4. In an elevator interlock, the combination with a bar adapted to be-secured to a door so to project therefrom, said bar 'ter-' minating in a hook, of a tired casing with a tumbler rotatably mountedtherein and 1 having a peripheralrecess forreceivingsaid hook,means positively preventing movement of said tumbler lengthwise ofits axis, a radial projection on said tumbler, a latch, spring means acting upon the latch to move the same into position behind said projection to lock tumbler and thereby lock the therefrom and terminating in a hook, of a.

casing with a tumbler rotatably mounted therein and having a recess for receiving said hook when the door is closed, a'latch engageable with said tinnbler to lock the door closed, an insulating block mounted in said casing, two electrically conductive bars mounted on said block, means for connecting said bars respectively tothe lead'wires of an electric circuit, a contact carried by said latch and insulated therefrom, said contact being electrically connected to one of said bars and in position to establish an electrical connection with the other bar only when said latch is in locking relation to said tumbler. I I V 6. In an elevator interlock, the combination with a door, of a fixed casing mounted adjacent the doorway, a latch projecting into said casing, a rotatable tumbler with which the latch normally cooperates to lock the door when closed, meansfor moving the latch to unlocking position when the car stops opposite the same, an insulating block mountedv within said casing, two electrically conductive bars mounted on said block, means for connecting said bars respectively to the lead wires of an electric circuit, a contact carried by said latch and insulated therefrom, said contact being electrically connected to one of said bars and in position to establish an electrical connection with the other bar only when said latch is in looking relation to said tumbler, whereby to prevent starting the elevator car unless said latch is in looking position. V v v 7. In an elevator interlock, the combination with a door having a bar projecting therefrom and terminating in a hook, of a casing with a tumbler rotatably mountedtherein and having a recess for receiving said' hook when the door is closed, a latch engageablewith said tumbler to lock the door closed, a circuit for controlling the operation of the elevator car and including a contact carried by said latch, said contact being in position to close said circuit only when the latch is in locking relation to the tumbler.

the car'is opposite the 8. In an elevator interlock, the combination with adoor, of a fixed casing mounted adjacent the doorway, a latch associated with said casing, a rotatable tumbler within the casing with which the latch normally cooperates-to lock the doorwhen closed, means for moving the latch to unlocking position when the carstops opposite the same, a cirsuit for controlling the operation or the elevator car and including a contact carried by said latch, said contact being in position to close said circuit only when the latch is in looking 1 relation to the tumbler, thereby making it impossible to start the elevator car except when the door is closed and locked.

9.1111111 elevator interlock, the combination with a bar adapted to be attached to a door and having a hook tiereon, of a casing with a tlnnbl'er having a notch normally in position to receive said hook, a projectionon said tmnbler, a latch normally engageable behind said projection to lock the door when closed, and means rendered operable by opening the car operating circuit, only when the car is opposite the door,'to withdraw said latch out of the path of said projection and to always maintain it in that position until the car operating circuit is again closed. i

10. In an elevator interlock, the combination with a door, o'ta bar projecting thereirom 1n the d1 rcction of the amb toward which the door moves in closing, said'bar terminating in a hook, acasing having an opening which the hook enters as the ,door closes, a rotatably mounted tumbler within me casing and having a notch normally in position to receive-the} book as it enters through said opening, so that a rotary movement is imparted to the tumbler, means 0perable to lock said tumbler with the door closed, and means operable to start the car including an electric circuit and a switch which is closed by said tumbler locking means when the latteris in lockin g position.

11. In an elevator interlock, the combination with a bar-adapted to be attached to a door and having a hook thereon, of a casing ith a tumbler mounted therein and having a notch normally in'position to receive said hook, a projection on said tumbler, a latch normally engageable behind-said projection to lockcthe door when closed, and means controlled by the car operating circuit and rendered operable by opening said circuit, only when the car is opposite the door, to withdraw said latchout of the path of said projeotion and to maintain it ijnthat position until the car operating circuit is again closed.

,12. In an elevator interlock, thecombination with a bar adapted to be attached to a door and having a hook thereon, of a casing with a tumbler mounted therein and having a notch normally in position to receive said hook, a pro ection on said tumbler, a latch normally engageable behind said projection to lock the door when closed, an operating 1 arm connected with said latch, a retiring cam,

' is opposite the door and the current shut off,

and means rendered operable by opening the car operating circuit, onlywhen the car is opposite the door, to cause said cam, in connection with said operating arm, to withdraw Said latch .out 01 the path of said projection and to maintain it in that position until the car operating circuit is again .closed..

13. In an elevator interlock, the combination with a hatchway door, of a casing with a tumbler rotatably mounted therein, means associated with the tumbler for locking the door; when the latter is closeda-nd the tumbler is in locking position, a car operating circuit, means norm-ally operable, only when the car tion with a hatchway door, of a casing with a tumbler rotatably mounted therein, means associated with the tumbler for locking the door closed except when the car is opposite the door, a car operating circuit including contact-s which can be closed only when the tumbler is in locking position, and means associated with the tumbler, independent of the door, and tending :to hold the tumbler in unlocking position, thereby holding the carlopcrating circuit open, or to restore it to that position in the event it is tampered with. a 15. In an elevator interlock, the combination with a fastening member adapted to be attached to a door, of a casing with a tumbler rotatably niounted'therein, said fastening means being engageable with the tumbler to rotate (the latter from unlocking to locking position as the door is closed, means associated with the tumbler and the fastening member for locking the door when the tumbler is in looking position, 1neans,0perable only when the door is locked, tostart the car, and means associated with the'tunib'ler and operable to move said tumbler to unlocking position, or normally to maintainit n su h position, unless it is moved out of such position by said fastening means. 7 16. In an interlock, .a tumbler rotatable to looking or unlocking position, fastening means cooperating with said tumbler to, rotate the same from one of said positions to the other, means to lock said tumbler lockposition, and means, independent of said htstening means and locking means, tending to rotate the tumbler to unlocking position.

[17. an interlock, a tumbler rotatable to locking or unlocking position, fastening means cooperating with said tumbler to rotate the same from one o fsaid positions to the other, and means to locksaid tumbler in looking position, said tumbler beingso weighted that it tends to rotate to unlocking position independently of the operationoil the fasten ing means and locking means.

In testimony --whereof I have hereunto signed my name to this specification,

' vJOHN A. BRUBAKEB.