US2506496A - Elevator lock - Google Patents

Description

May 2, 1950 H. A. FLINT ETAL.

ELEVATOR LOCK Filed July 5, 1949 5 e n M E a w r Vb/ /ggg m z XIJ nlwfinzflnrflwmvww ray 7 WWW I L n. i: m 2 M F a? M As .s .m 4 xmwa/aaaa .1 mm I H v. M B

: Eic l 5, ,2 MM r ATTORNEYS May 2, 1950 H. A. FLINT ETAL 2,506,496

ELEVATOR LOCK I Filed July 5, 1949 2 Shets-Sheet 2 5 5| a w INVENTORS HAROLD A. FLINT CHARLES Ft LANTZ ATTORNEYS Patented May 2, 1950 UNI-TED tartar oFFIQE Harold A. Flint, San Francisco, and Charles F.

' LantzrOakland Galif,

ApplicationJuly 5, 1949,;Se1fial-No. 103,08} 3 Claims. (Cl- 181 31) This invention relatesilto...e1evator locksior use :at-the .fioor. .The...invention. is similar to, that disclosed in our copening. application iorpatent Serial No. 7-.'l.'l,97.8,,..fi1edl 0ctober 4, 1945!, Patent No. 2,499,431,.issuedlMarch71,1950.

Prior deizices. of this "nature have. 101' the. most ,part been.re1ative1y ,.comp1icated and..expensive. to make and have] many times. required expensive accurate machining operations. These. previous devices have generally employed .a .meansactuated by the elevator .torengaging. or disengaging Ia. gate latch. wmcnm. turn either locksor unlocks .theelevator gate, thus establishing an..interde.-

pendence. between the .elevatoractuated .{means Land. the gate latch. Al'sdthe means .for, makin and break g...the power circuit. has generally been. made dependent, upon the meafDsactuated by the gate.

Qneof thaobjectsorthis inventionthe provision of. an elevator 100k which is extremely. simpie to. make, and. to maintain.

Anotherobject of the. invention is the provision .otan elevator lock, which obviates the accurate machining operations required .in. locks having various interengaging parts.

Generally stated; the present invention con;

templates the provision or an. elevator lock which empl two. independent latches, one for en iing and l'ockingthe'gatei in closed position and another for breaking the elevator, power circuit.

The independencepf. these latches makes for a l'essexpensive constructionand reduces the number of parts required.

Other objects and advantages of the present invention will be seen from the followingspecification and the attached drawings wherein:

Fig. 1 is a front 'elevationalview ofthe locking mechanism with the housing cover removed.

Fig. 2- is aside elevational' vie'w partlyinsectlon of the mechanism shown in Fig; l but 'w'ith the upper latch omitted for "clarity and as taken along lines 2+2 of that figure;

- Fig. 3 is a side elevational view similar to 2 but as taken along the lines "3 -3ofi1 ig.' 1; 4 is'a fragmentary-assembly view of the invention shown in conjunction with'an elevator 2. vided: with .a box-like housin generally de igtnated andhavinga pair of; opposed side walls 3:.a bottom wall 4 and a back wall 5. The top .andfro'nt. of the housing are open. but are adapted .to be coveredby a removable cover plate (not shown). Spacedfrom-the back wall'5 is a mounting plate 6 which is parallel to the b ack wall,.5 butspaced therefrom by a spacer 1 adjacent the lower edge oithe back wall 5.

The backwall 5, mounting plate. 6 and the spacer I; may be integral-ly;cast together as shown in Fig- 2 but however. formed, the spacing be.- tween the backwall 5i and the. mounting plate vIi results. in a relativelynarrow upwardly and lat- .erallyoutwardly opening slot -8. extending the .greater' part. ofv the vertical. length of.- the back plate. 55-

' Extending between. sidewalls .2','3{ adjacent their upper. .ends! andiournal-led. therein is ashaft. In which extends laterally outwardly of the sidewall ej-arrclto which 'isgsecured an arm H by means .of: clamping bolt l2. The, arm ll extends ra- .-.dialLvcouitwardly;of the shaft l0 and is provided at. .iitsr-outerend. with-a .rollerl3 for. a purpose to 3 be subsequently described in detail. Secured. to

is: formed with a, tooth 2!! and has; a relatively straight low-erface 2| and a curved, cam-like :upper surfaeeJZZJfQr a, purpose to be subsequently described in detail. When the latch 15. is swung "to: the-fullline position of Fig; 3 this tooth 20 extendsithrough, opening. 23. in. backplate .5 and which openingisrformed so'that' its. upper edgei l f acts as; a stop.- to preventxfurther move.- mentzof-"the latch li tathe. right asiseeninEig. 3:. A, corresponding opening 26 is formedxin' the mounting platev Brt-o permit clearance for the teeth 20.'

Another shaft. 30" extending between sidewalls 213 and spacedi'downwardly therefrom supports another latch 3| which is rotatable onsaid :sha'ft (Fig. 1). JSpacersAZ, 33 space the latch 3| from the sidewalls v2-5 andi topermit the latchciil to clear the latch; I25. Asjbest seem iii-Fig.1 the latch- 31 which. is

also preferably formed from heavy gage steel is generally triangular in shape and is provided with a pair of generally vertically spaced projections 34, 35 for a purpose to be subsequently described. Secured to the side of the catch 3! and positioned adjacent the corner of latch 3| opposite the projections 34, 35 is a pin 36. This pin 36 pivotally supports the upper end of a vertically disposed switch arm 3! which carries adjacent its lower end a jumper 38. This jumper 38 is provided with a pair of contacts 39, 46 adapted to engage power circuit connections 45, 46 upon upward movement of the arm 31. In Figs. 1 and 2 the switch is shown in full line in its closed position and in dotted line in its open position. In the latter position, the power line of the elevator is broken and the elevator cannot be moved. The lower end of the arm 31 is reduced in cross-section as at 41 and the jumper 38 is slidable along this reduced portion but is urged upwardly by a spring "48 surrounding the reduced portion of the arm 31 and bears at its lower end against a plate 69 secured to the end of the arm 3?. The spring 48 permits overtravel of the arm 3? when the same moves upwardly under the action of the latch 3 l In the full line position of latch 3! in Fig. 2, the jumper 38 completes the circuit to the elevator. Referring to Fig, 2 it is seen that the lower projection of the latch 31 is being held to the left by a member El which member is the lower extremity of an arm generally designated 52 (Figs. 4 and 5) secured to the elevator gate 53. Thus when the gate is closed, the member 5! engages the latch 3| at its lower projection 35, -closing the power circuit to the elevator. An opening 51 in backplate 5 is provided to permit the projection 35 to enter the slot 8 and an opening 6! is provided in mounting plate 6 to permit free movement of the projection 35 through the backplate. As can be seen from Fig. 2, upon upward movement of the member 5!, when the gate is opened, the member 5! will engage the upper projection 34 of the latch 3! rotating the latch counter-clockwise and positively breaking the contacts 39, and 4! 46 to prevent movement of the elevator. An extension 21 of backwall 5 is provided slanting generally upwardly and away from mounting plate 5 to facilitate the entrance of member 51 into the slot 8.

Referring to Fig. 4 the roller E3 on the arm II is adapted to engage a shoe 55 secured to the elevator 55 so that when the elevator approaches the floor level, whether it is moving upwardly or downwardly, the arm H will be swung into the full line position of Fig. 4, thus swinging the latch l5 clockwise to cause the tooth 29 to move out of the slot 8 and into the housing I and permitting upward movement of the memher 5! upon opening of the gate 53. Thus it is seen that when the elevator is not adjacent the floor, the member 51 is held against upward movement by the tooth 2i) on the latch 15. Upon approaching the floor, the elevator causes the arm is to swing clockwise as seen in Fig. 4 to swing the latch 15 out of the slot 8 thus permitting opening of the gate 53. In Fig. 2 the arm H is shown formed in two sections 62, 63, which are slidable with respect to each other. Elon gated slot fi l formed in section 63 and bolt 65 threadedly secured to section 62 permit longitudinal adjustment of the arm ll for properly positioning the same with respect to shoe 55.

The latch l5 may be weighted as shown in Fig. 3 to cause the tooth 26 to be urged into the slot 8, however, it is preferable that a torsion spring such as is indicated at I9 in Fig. 1 be also provided on the shaft 10 for positively urging the tooth 20 into the slot.

It is apparent that the present invention provides a simple and inexpensive safety device for use with elevators. It is to be understood that the device herein disclosed is merely a preferred embodiment of the invention and modifications may be made thereto without departing from the spirit of the invention.

We claim:

1. A look for a motor actuated elevator and for a shaft gate comprising, a body adapted to be stationarily. secured to a wall of an elevator shaft adjacent an entrance to such shaft and provided with a vertically extending upwardly opening passageway for vertically reciprocable movement of a member on said gate into and out of said passageway through its open upper end, a first latch and a second latch respectively supported on said body for movement to and from a position extending across said. slot with said first latch positioned above said second latch, an element connected with said first latch engageable by said elevator upon movement of the latter to said entrance for causing said movement of said first latch out of said passageway to permit passage of said gate member therepast and out of said passageway, said second latch including a projection engageable by said gate member upon movement of the latter into said slot and past said first latch for moving said second latch across said passageway and over said member, a pair of electrical contacts on said body respectivel in an electrical circuit with the elevator motor, a switch bar for said contacts and closing said circuit connected with said second latch for movement to circuit closing position upon movement of said second latch to said position over said member and for movement to circuit opening position upon movement of said second latch out of said passageway.

2. A lock for a motor operated elevator and for a vertically recipro-cable shaft gate at a landing in the shaft in which said elevator is movable comprising, a body adapted to be stationarily secured to a wall of said shaft at said landing and in a position for receiving a member on said gate when the latter is closed and at the lower end of its stroke, said body being provided with a pair of spaced, vertically disposed walls between which said member is adapted to be so received, an upper pair and a lower pair of horizontally aligned openings formed in two opposite sides of said passageway, a latch, formed with a pair of vertically spaced laterally extending projections, respectively adjacent said upper and said lower pairs of openings, a pivot between said projections and to one side of a line extending between said projections supporting said latch on said body for swinging the upper and lower projection into and out of said upper and said lower pairs of openings upon oscillation of said latch on said pivot under the influence of said member upon said gate being closed and opened, said upper projection being disposed over said member and through said upper pair of openings upon said gate being closed, an electrical circuit in which the elevator motor is disposed, a mechanical switch on said body and in said circuit, a link connecting said switch with said latch for opening said switch upon movement of said upper projections out of said openings under the influence of said member when said gate is opened, and for closing said a 8 switch upon movement of said upper projection into said openings when said gate is closed.

3. A lock for a motor operated elevator and for a vertically reciprocable shaft gate at a landing in the shaft in which said elevator is movable comprising, a body adapted to be stationarily secured to a wall of said shaft at said landing, said latch pivotally supported on said member for movement to a position extending across said. passageway and said member when said gate is,

closed, a cam actuated follower connected with said first latch for causing withdrawal of said first latch when said elevator is at said landing,

6 and a cam engageable by said follower for so actuating said first latch, an electrical circuit for the motor elevator, a' mechanical spring actuated switch in said circuit and on said body for nor-f mally holding said switch open and a second catch pivotally supported on said body and con-,- nected with said switch for closing the latter upon movement of said latch underthe influence of said member when said gate is close'd, said second latch including a projection thereon engageabl by said member When sa'id gate is closed for 50'' moving said second latch.

HAHQOLD A. CHARLES F. LANTZ'.

No references cited.

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