US1495808A - Safety cut-out switch for elevator locks - Google Patents

Description

May 27, 1924. 1,495,808 l l J. D-QSCHAKEL. ET Al.. y

`, SAFETY CUT-OUT SWITCH FOR ELEVATOR LOCKS Fild Nov. 15;, 1922 2 sheets-sheet 1 2 Sheets-Sheet. 2

mma@ 4Z May 27 1924.

Patented May 27, 1924-.

tra sr ras 1,495,808 ,Aren erica.

JACOB D. SCHAKEL AND JOSEPH Bron or CHICAGO, ILLINoIs'AssIGNORs yTo aLnvA-v TOR COMPANY or AMERICA, or" CHICAGO, ILLINOIS, A CORPORATION' or ILLINOIS.

sArnzrr Cor-OUT SWITCH ron'nLEvA'roa LOCKS.

Application led November 15, 192. Serial No. 601,136.

To all whom t may conce/ML:

Be it known that we, JACOB D. VSCHAKEL and .IosErH RICE, citizens of the United States, residing at Chicago, inthe county of Cook and State of Illinois, have invented a certain new and useful Improvement in Safety Cut-Out Switches for Elevator Locks, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings forming a part of this specification.

Our invention relates to safety cut out switch mechanisms for elevator door locks, and more particularly to a switching mechanism of this character that is insertedA in an operating current circuit so as to break said circuit when the door is not securely locked. In elevator constructions, and particularly in an automatic elevator construction, it is very important that meansis provided whereby it is impossible to operate an elevator when the door is unlocked. Some difiiculty has been experienced in providing means for preventing the operation of the elevator when the door is not securely locked. In certain locking devices which have been previously provided, the* difficulty has arisen that` the circuit would be closed when the latch for the door was not held in position behind the abutment on the member mounted in the door frame, or hatchway, so that the door could be opened'after the elevator has left the Vfloor at which said door person to Open the.door.after`the elevatorl has left the floor and -'walk "into the shaft.

y It is a purpose of the invent/ion to provide switching mechanism which is associated with a locking device in such a manner that the4 locking device must be in such position to securely lock the door before said switch is closed to complete the circuit through the same. This is particularly adapted for use with door locking mechanisms for automatic elevators that are Operated in such a manner that the door cannot be unlocked unless the elevator is stopped' opposite the floor at which the door located;

It is a further `purpose of the invention to provide a switchingmechanism which isassociated with a door latch that holds -the the switching device inl circuit closing position when the latch 1s 1n' engagement with latching means in the casing or hatch, said switching mechanism having'a normal tendency to move to Open circuit position.

In the specific embodiment shown a contact member is provided which is movable into and out of circuit closing position, said member being movable out of circuit closing position by a resilient member andinto circuit closing position by a member 'associated withy a latch movable into andout of door holding position when. said latch isin Aengagement with means to hold thev door closed. The action of said means is substantially a snap action so as. to close the switch at the instant when the latch drops into locking position and notprior thereto.

Other objects and advantages of the invention will appear as the-description of the accompanying drawings proceeds. However, we desire toqhave it distinctly understood that we do not intend limit Ourselves to the exact details shown or Vdescribed but that we intend to include as partof our invention all such obvious changes and modifications of parts as would occur to a personskilled y'in this art and as would fall within the scope of theclaims.

In the drawings:V

Fig. 1 is a View partly in vertical section and partly in elevation showing my improved switching mechanism associated with a door lock; l

iFig.; 2 is a section taken on the line 2-2 of Fig'l;

Fig. 3 is va' section taken on the line 3-3 of Fig.1;and i f Fig. 4f is a section taken on the line 4-4 of Fig. 1.

Referring in detail to the drawings, the invention is shown as comprising a casing 10 mounted in any suitable manner `on the door casing or in the hatchway in a stationary posit'ion. The numeralll indicates a` housing within which the latch is mounted, said housing 11 being secured in any suitable manner to the elevator door in such a position that the latch carried therein is. adapted to cooperate properly with a suitable holding member in the casing 104 to hold said door-in closed position. Within the housing 11 is mounted the latch member 12'which lis adapted to pivot on the shaft 13, saidmem.-l ber 12 being provided with a hook 14which is provided with a shoulder at :15, said mem-5 loer- 12 passing through the opening 16 in lio the wall portion 17. The meinberv14V engages with the catch 13 having the abutment 19 thereonv with which the shoulder 15 engages, the catch 1S being provided on the locking member 2O pivotally mounted between the walls- 21 of the easing 10, said pivot being designated by the numeral 22. The member 12 is provided with an upwardly extendingarm 23 which has pivotally secured thereto the ear 24 carrying the pin 25 which is slidably inountedin the end wall 26 of the housing 11.-A Surrounding said Vrod 25 is aV coil compression spring 27. TheA member l23 extends through a slot 28 in the top of the khousing 11 and is provided at the outer end thereof with a curved face 29 to provide a tapering end portion for said member 23 terminating in the rounded point Y 30. It will be seen that when the member 124 is raised, the spring 27 will be compressed, and the tendency Lwill be for the member 23 to be swung in an antiecloclwise direction around the pivot 13 due to the acber 34 leads to a binding screw 36 which is electrically connected with the conducting strip 37 mounted in vany suitable manner as bymeans of the boltV 38 on the block of insulation 39, said block of insulation 39 being mounted on the partition 32 by means of the bolt 40, a base member 67 being provided for said block v39. The

strip 37 terminates in a spring contact finger 41 which is arranged in opposed relationship to the spring contact point 42 provided on the conducting` strip 43 which is secured on the block of insulation 39 by means of the bolt 44, said conducting strip being electrically connected with the binding-screw 45 with which the conductor 35 isconnected.

Cooperating with the contact members 41V and 42r is a bridging contact member 46V which is mounted on the plunger 47 extending through the opening 43, said member 46 being insulated from the member 47 by a piece of insulating'material 49. Y Y The member 47 is pivotallv connected with one arm 50 of: the bell crank lever 51 pivotally mounted on the shaftA 52 Yextending outwardly from the boss 53 provided on the extension 31 of the casinglO. The otherk arm 54 of the bellcrank lever 51 is pinned'y by means of the pin55 to thereciprocating 62 extending through the opening 63V in the forward wall of the extension 3 1 of the casing 10, said extension 62 screwthreadedly receiving the block 64 and the nut 65 thereon.

twill be seen that due to this arrangement, Vthe member 64 can be adiusted on the member 62 and` locked in adiusted position byineans of the member 65 so as to' adjust the distance `that the meniber'62 extends outwardlyfrom the casing 31. so that thevforward face 66 of the arm 23 ca n be so adjusted that thesame will engage with the member 64 only to a sucient degree to move the bell crank lever 51 to a position' to cause the contact 46 to bridge the gap between the contacts 41 and 42 when the member 12 is in such a position that the hook-like end portion 14 thereof is interlocked with the catch 13 to lock the door in closed position. This being true also, because of the fact that there will be no engagement between the member 64. and the member 23 until the door is in closed position. as otherwise the front face66 of the 'member 23 will not bein such a position as to engage the Ymember 64 sufficiently to move the contact 46 into bridging relationship relative to the contacts 41 and 42. Due tothe provision of the spring 27 which is stronger than the spring 61, this action will take place substaiitiallv instantaneously when the door is in position to be member 12, so that the arm 23 will be thrown toward the rightin Fig. 1 andV will remainV in such position `until the shoulder V15 drops behind the abutment 19, at which timerthe arm 23 engages with the block 64 to move the contact 46 to circuit closing positionf The member 20 has the extension 72 therei on against which'the springr69 bears, said extension engagingY the forward wall ofthe casing 1()V to liinit the movement of the membeil 18 so that the same is in alignment with the face of the casing 10.v toward the door. j

A lever 7 3 is pivotally mounted on the pivot 74 so as to be overbalanced toward the end Y 75 thereof, so that the same drops to the full line position thereof in Fig.v 1 due to theV acgaging the extension 2 -so as to prevent swinging ofthe member 2O on itspivot. i

tion of gravity Awith-theend 76 thereof enj The member 73 is adapted to engage an adjustable stop 81 mounted on the bracket 82 to limit the downward movement thereof. The member' 73 also serves as an armature for the electromagnet 77, said electromagnet having a projection 78 thereon entering the opening' 79 in the memberv 73 to guide the same. When the solenoids 7 7 are energized the member 73is drawn up to the dotted line position shown in Fig. 1, the member 20 is free to swing downwardly and the door carrying the casing 11 can be moved to the right, thus swinging the catch 18 downwardly out ot engagement with the hook 14 as the door is moved away vfrom the casing and permitting opening of the door. The solenoids 77, as more clearly described in our application, Serial N o. 526,752, iledJ an. 3, 1922, are energized when the door is closed,

vthe operating current of the elevator is off` and the elevator car is opposite the floor at which the door that is to be opened is located. The other conditions having been carried out the circuit is completed b-y a manuallj7 operated switch member operated at the floor, as described in said above mentioned application, only a portion of said mechanism being shown in this application to make the operation of the device clear. Said switching mechanism is mounted in the casing S xed in the hatch and comprises the member 86, the lower end 87 of which is adapted to move toward the left upon manual actuation of the switch, said member 86 having pivoted thereto the member 8S which carries the plunger 89 that extends through a suitable opening 90 in the locking member on the door, and which is adapted to engage with a plunger 91 mounted in the casing 110, said plunger having a contact member 92 connected therewith which slides through the web 93, and between which and the plate 94 engaging the casing 95 is a coil compression vspring 96. The member 94 is mounted to move with themember 92. The contact member 92 engages with the contacts 97 and 98 which are inseries with the circuit to complete the circuit through the solenoids 85 when the other necessary' conditions to complete the circuit exist.

It will be seen that when the door is open, and the member 89 is moved away from in front -of the member 91, the spring 96 acting against the plate 94 will move the same to the position' shown in Fig. 1, andthe contact member 92 will be moved out of engagement with the contacts 97 and 98. Accordingly unless the door is closed, the spring 69 will hold the member in an upward posi-w tion whether the manuallyoperated switch member is operated or not, and only when the door is closed Vwill it be possible to complete the circuit that breaks the joint at so as to permit unlocking of the door.- It will accordingly be noted that when the door is being closed, the spring will hold the member 20 in an upward position and the. face 70 will have to ride up on the corner 71'. before the hook 14 will move' into locking position. Thus it will be impossible to operate the car, because the circuit will be broken' /at the contact 46, except when the lever l2 has dropped tot the position shown in F ig. 1, and the door has been moved to closed po-V sition, sothat the arm 23 will be in such a position that the same will engage with the end of the member 64 as the member 12 drops downwardly into locking position. In unlocking the door the member 18 will drop due to the pull thereon by the hook 14, but the operating circuit will be broken again by movement of the contact 46 as the door moves to the right, because the member 23 will move away from the block 64, although the same is not raised.

Under certain circumstances it may be desirable to have some form of manually operable means for unlocking the lock, for eX- ample, if the car should become stalled between floors it may be impossible to get out of the hatch unless one of the doors could be manually opened. Accordingly a shaft 99 mounted in the casing 11 is provided which has a key receiving opening 100 therein, said shaft having the member 101 held in position thereon by means of the set. screw 102 so as to turn with said shaft 99. The member 101 is provided with a transversely eX- tending portion 103 that is adapted to engage under the member 12 to raise the same so as to raise-the hook 14 out of interlocking relationship with the hook 18. Thus the door can be opened, however, as the member 12 is moved to such a position that the door can be opened, the arm 23 will swing away from theblock 64 and the spring 61 will move the contact member 46 out of circuit closing-position, thus making it impossible to operate the `car until the door is again closed and locked.

Having thus described our invention, what we desire to claim and secure by U. S. Letters Patent is: j

1. nra device of the. character described, a door, a casing for said door, an abutment in said casing, aflatch on said door having a hook engaging said abutment for holdingsaid door against movement relative to said casing, a switching device and a' member on said latch movable in the direction of movement of said door to hold said switching device in circuit closing position when in locking engagement with said abutment. K

2. In a device of the character described, a door, a ,casing for-said door, an aubutment in said casing, a latch on said door having a memberu engaging said abutment for holding said door vagainst movement relative to said casing'. a ,normally open switching device and a lingcron said' latch- Cri engaging said switching device toV hold the same in circuit closing position when in locking engagement withsaid abutment.

3.*In a device of the character described, a door, a casing tor said door, an abutment in said casing, a latch on said door having a member engaging said abutment for holding said door against movement relative to said casing, a switching device and an arm on said latch engaging said switching device to hold said switching device in circuit Vclosing position when said latch is in'locling engagement with said abutment.

'4. In a device of the character described, a door, a liatch'way,'a latch on said ldooi' adapted to engage means in said hatchway to hold said door against movement, means for holding said latch in engagement with said means in the hatchway, a switching device comprising means for moving the same to open circuit position and a member associated with said latch and moving with said door Jfor holding` the same in circuit ciosing position when said latch engages said means in said hatchway. i Y

5. ln a deviceV ot the Ycharacter described, a door, a casing for said door, an abutment in said casing, a latch on said door engaging said abutment for holding said door against movement relative to said casing, a switching device and means on said latch tor holding said switching device in circuit closing position when in locking engagement, with said abutment, said switch being in V open position until said door is closed and said latch is moved into position to securel)7 hold said door against movement, said means moving in the direction ot the movement ot said door to 'openand close said switch.

G, In a device of the character described.I a door, a lock for said door comprising a movable member mounted on the door casing, a latch on said door adapted to engage said member to hold said door against move i ment,ineans for holding said latch in .en-

gage'i'nent therewith, a switching device comp'rising'means for moving the same to open circuit position and means associated with said latch for holding the same in circuit closing position, when said latch said meii'ibei,sf.iid switch being in open posi tion until said latch is moved into position f to securely hold said door against movement' and means for holding said movable inemm` bei1 against movement.

7. The combination witha switching de vice comprising a contact member movableV into and out ot circuit closing positioinof means for moving said member out oit circuit closing position, and'means 'for holding said member in circuit closing position, said means comprising` aY door latch and a membei moving with said latch in thedirection of` movement offsaid door `engaging said switching device toY close the circuit oniy when said latch is in inal door latching position.

8. A device of the character described, i

comprising a contactlmember movable Yinto and out ol circuit closing position, a phuiger, means connecting said member and plunger,

means foi-moving' said member out ot circuit` closing position, and means engagingV said plunger for holding said member Vin vcircuit closing position, said means compris` ing a door latch, an abutment with which member in circuit closing position, saidY means comprising a door latch and a meinber .moving with said latch engaging saidv switching device to close the same onlyYV when said latch is in final door latching position. Y

l0. In a device of the character described, a switching device interposed inthe elevator operating circuit comprising a contact niember movable into and out ot circuit Aclosing position, means 'tor moving said contact member out ot circuit closing position and means for moving said contact member intoV circuit closing position, said means rcompris'- ing a door latch having a member moving therewith in the direction of movement of said door engaging said switching device to close the same only when .said door is closed and said latch is in final ,door latching position. Y

ll. In a device of the character described, a switching device'inteiposed Vin the elevator operating circuit comprising a contact member movable into and out 'of circuit closing position,resilient means for movingl said contact member out of circuitl closing posi,- tion and means for moving said contact member into circuit closing position, said means comprising a door latch having a member extending therefrom engaging 'said switching device` when said door is closed.Y

and said latch is'in door latching positionl2. In a device ot the character described,

a switching device interposed in the ele-V` vator operating circuit comprising a( contact .member movable into andV out of circuit closing position, a reciprocable member connected therewith, resilient means i for Yiso4 circuit closing position when said door is closed and said latch is in latching position.

18. In a device of the character described,

va switching device interposed in the elevator operating circuit comprising a contact member movable into and out of circuit closing position, areciprocable member connected therewith, resilient means for holding said reciprocable member in open circuit position, a door latch, and means associated with said latch engaging said reciprocable member to move the same to circuit closing position only when said door is closed and said latch drops intovlatching position.

14. In a device of the character described, a switching device interposed in the elevator operating circuit comprising a contact member movable into and out of circuit closing position, a reciprocable member connected therewith, resilient means for holding said reciprocable memberv in open circuit position, a door latch, and a member moving with said latch, said reciprocable member projecting into the path of said last mentioned member, whereby said reciprocable member is moved to circuit closing position when said latch moves to door locking positio-n.

15. In a device of the character described, a switching device interposed in the elevator operating circuit comprising a contact member movable into and out of circuit closing position, a reciprocable member connected therewith, resilient means for holding said reciprocable member in open circuit position, a door latch, and a member moving with said latch, said reciprocable member projecting into the path of said last mentioned member and being adjustable, whereby said reciprocable member is moved to circuit closing position when said latch moves to door locking position.

16. In a device of the character described,

a switching device interposed in fthe ele-V vator operating circuit comprising a contact member movable into and out of circuit closing position, `a reciprocable member connected therewith, resilient means for holding said reciprocable member in open circuit position, a door latch, and a member moving with said latch, said reciprocable member projecting into the path of said last mentioned member, whereby said reciprocable member is moved to circuitclosing position when said latch moves to door locking position, said latch and member moving therewith moving into door locking and circuit closing position with a snap action.

17. In a device ofthe character described,

a switching device interposed in the elevator operating circuit comprising a contact member movable into and out of circuit closing position, a reciprocable member connected therewith, resilient means for holding said reciprocable member in o-pen circuit position, ra door latch, an arm on said latch adapted to engage said reciprocable member, and spring means for moving said latch into door locking and said arm into switch actuating position. i Y

18. The combination with an elevator door of'a switching device interposed in the elevatoroperating circuit, an electric door` lock and means for moving said switching device to open circuit position by opening movement of said door, said door lock unlocking said door only when the operating current is off, and said operating circuit being maintained open' by said switching device until said lock locks said door.

19. The combination with an elevator door,l of an electric door lock comprising a latch and a movable member normally held in position to interlock with saidvlatch to hold said door against movement, a switch interposed in the elevator operating circuit, means for moving said switch to open circuit position, and means associated with said latch for closing said switch when said door is locked.

20. In a device of the character described, a door, a casing for said door, a latch on said door for holding said door against movement relative to said casing, a switching device, means for moving said switching device to open circuitl position and a member on said latch engaging said switching device to move said device to closed circuit position, said member being 'movablerout of engagement with said switchin device upon movement of said door toward open position without actuating saidlatch.

21. In a device of the character described, a door, a casing for said door, a latch on said door for' holding said door against ing device to open circuit position and a j member on said latch engaging said switching device to move said device to closed circuit position, said member being movable out of engagement with said switching device upon either raising said latch or opening said door upon movement of said door toward open position without actuating said latch. Y

In witness whereof, we hereunto subscribe out names this 31st day of October A. D.,

Y JACOB D. SCI-IAKEL.

JOSEPH RICE.

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