US2157930A - Lock for elevator doors - Google Patents

Description

y 1939- H. H VANDERZEE 2,157,930

LOOK FOR ELEVATOR DOORS Filed Jan. 28, 1958 1 INVENTOR Harry/7'. Vanderzee.

AIKXVVITNESSE'SZ W -ATTO EY Patented May 9, 1939 2,157,930

UNITED STATES PATENT OFFIE LOOK FOR ELEVATOR DOORS Harry H. Vanderzee, Michigan City, Ind., assignor to Westinghouse Electric Elevator Company, Jersey City, N. J a corporation of Illinois Application January 28, 1938, Serial No. 187,503

2 Claims. (01. 18731) My invention relates to elevator door locks tion or hook 25 disposed to be secured in the lock and more particularly to door locks disposed to by a locking latch 26 when the door is in its closed be operated by cam devices on the elevator cars. position and the locking mechanism is actuated One object of my invention is to provide an to lock the door.

elevator door lock which shall have a small num- The latch 26 constitutes a projecting portion of ber of parts, which shall be simple and inexpena lock spindle 2'! mounted upon and fixed to a sive in construction and which may be easily inhorizontal shaft 28 rotatably mounted in a pair Stalled, operated and maintained in operation. of bearings 29 and 30 in opposite sides of the Another object is to provide a lock which shall casing ID. A machine screw 3| passes through safely interlock the control circuits of the car to the spindle 2'! and the shaft 38 to cause the prevent movement of the car whenever the lock spindle and the locking latch thereon to rotate fails to operate or the door is not closed and with the shaft when it is operated to lock or unlocked. lock the door.

A further object is to provide a door lock which An operating arm 33 is mounted upon the shaft will not require the use of springs for controlling 28 by means of a bolt 34 and has upon its outer it operation, end a roller 35 disposed to be engaged and oper- For a better understanding of the invention ated by a cam 36 mounted upon the elevator car reference may be had to the accompanying draw- (not shown) when the car is to make a stop at ing, in which: I the door at which the lock is located. Inasmuch Figure 1 is a view in front elevation of a door as cam operated arms of this nature are old and 20 lock embodying my invention, the front cover Well known in the art and any suitable cam and being removed to expose the inner parts of the arm will be satisfactory, no further detailed delock, scription thereof will be given. However, it will Fig. 2 is a view in side elevation of the lock be obvious that when a car comes into the floor shown in Fig. 1 with the body of the lock shown and its locking cam is projected to engage the 25 in cross-section along the line IIII of Fig. 1, roller 35, the shaft 28 will be rotated by the in- Fig. 3 is a top plan view of the lock shown in Ward movement of the arm 33 to move the lock- Fig. l as installed on a side opening corridor ing latch 26 downwardly and thus free the hook door for an elevator, and 25 to permit it to be withdrawn from the lock Fig. 4 is a slightly enlarged view in side elevawhen the door I8 is opened. tion of the locking hook shown in Fig. 2, with The spindle 21 is provided with a projecting part of the insulation thereon broken away. m er 31 disp to engage a l 38 mounted Referring more particularly to the drawing, I on the interior of the casing Ill to limit the have illustrated a door lock 9 as having a hollow upward movement of the latch 26 and the out- .5 rectangular box or casing I!) provided with a ward movement of the arm 33, as desired. It will cover II which may be secured to the front of be observed that the distribution of the weight the box by a plurality of machine screws H2. The of the arm 33 and the weight of the latch 26 is casing is provided with an upper lug l3 and a such that the latch will be retained in its locklower lug [3a having holes M by means of which ing position by the weight of the arm unless the 40 it may be secured to a door frame [5 by means of arm is forceably raised and hence no springs are 40 suitable bolts IS. The lock 9 is shown (Fig. 3) necessary to hold the latch in its locking position as mounted on the door frame l5 in position to when it is not being operated to move to its serve a side opening door 18 (only a small portion unlocked position. of which is shown in section). V The limiting extension 31 is also extended hor- The door is provided with a locking bracket 20 izontally toward the left-hand side of the casing 45 which is secured to the side of the door by suit- (see Fig. 1) so that a key (not shown) may be inable screws 2|. On the outer end of the bracket serted through a key-hole 40 in the lower rear is mounted a hook member 22 disposed in posiportion ofthe casing Ill and the face of the door tion to pass through an aperture 23 in the door jamb. If a key is pushed through the aperture jam and enter the lock 9 when the door is closed. 40 into engagement with the extension 3?, it will 50 The hook 22 may be an integral part of the cause the latch 26 to move downwardly out of bracket or it may be constructed of any suitable its locking position without the necessity of 0pmetal and be welded to the bracket as at 24 by crating the arm 33. This is to permit the eleany suitable welding means. The hook member vator attendant or the repairmen to open the is provided with a downwardly extending projecdoor when necessary. An escutcheon plate 4! is mounted on the door jamb to protect and decorate the aperture 40.

In order to prevent operation of the car while the door is open or while it is closed but unlocked, I have provided a pair of interlocking switches 44 and 45 which may be so connected in the control system of the car that the car cannot be operated as long as either one of these switches is open.

The switch 44 comprises a pair of contact members 46 and 41 disposed to be connected by a contact plate 48 when the door is closed. The contact plate 48 is mounted upon an insulating block 49 secured to an insulating sleeve 50 mounted upon the hook member 25. The insulating member 56 may be readily constructed by taking a block of suitable fibrous material impregnated with a phenolic condensation product, such as is sold under the trade-mark Micarta, and sawing a slot in its underside so that it may be placed astraddle the curved upper portion of the hook member 22. A suitable screw 5| is provided for holding the insulator 50 on the hook member and a suitable screw 52 is provided for holding the plate 48 and block 49 on the end portion of the insulator 58. The contact members 46 and 41 are mounted respectively upon a pair of spring contact arms 53 and 54 disposed in suitable slots 55 in an insulating block 56 which is secured by a pair of screws 51 upon the face of a supporting lug 58 extending inwardly from the rear wall of the casing Ill. The contact arms 53 and 54 are maintained in position by binding posts 70 and 1|. By this construction it will be seen that when the door I8 is in its closed position, the hook member 22 presses the contact plate 48 against the contact members 46 and 41 and thereby completes a circuit through the contact arms 53 and 54. Likewise, when the door is opened, the contact plate 48 is withdrawn from the contact members 46 and 41, thereby opening the circuit through the contact arms 53 and 54.

The switch 45 is disposed to be operated by the locking arm 26 and comprises a contact plate 62 and a pair of cooperating contact members 63 and 64. The contact plate 62 is mounted upon an insulating block 62a disposed upon the upper end of a switch arm 65. A screw 66 is provided for holding the plate and block in position on the arm. The arm is mounted at its lower end on a projecting portion 13 of the spindle by a screw 61 and by the machine bolt 3| which passes through the arm as well as through the shaft 28. The contact members 63 and 64 of the switch are mounted upon a pair of spring cont- act arms 63a and 64a which are disposed in suitable slots 55 in the insulating block 56 and secured in position by binding posts 68 and 69.

By this construction it will be seen that when the car comes to a stop at the floor and moves its cam 36 against the roller 35, the arm 33 rotates the shaft 28 to release the locking latch 26 from its locking position. The rotation of the shaft moves the arm 65 (Fig. 2) in a clockwise direction which removes the plate 62 from its engagement with the contact members 63 and 64, thereby opening the switch 45 when the door is unlocked. It will also be apparent that when the car cam is removed from the roller, the weight of the roller and the operating arm causes them to rotate the shaft in a counter-clockwise direction (Fig. 2), thereby moving the latch into its locking position and at the same time closing the switch 45.

It will be observed that the insulating block 56 is provided with rather deep slots in which the contact arms are mounted and is itself mounted on the free end of the extension 58 in the lock casing so as to afford long creepage paths between the live contact arms when the switches are closed, but, in order to further provide against short circuits in the look, I have placed upon each side wall an insulating sheet 8| and upon the inside of the cover ll, an insulating sheet 82. The sheets are secured to the interior of the casing walls and the cover by means of suitable rivets 83. By reason of the insulating sheets and the insulating block, the switch parts are so completely separated from each other and from the walls of the casing that there will be no danger of short circuits in the look at any time.

If desired, the contact arms of each switch may be connected to different portions of the control circuit (not shown) by connecting the conductors 60 and 68a to the binding posts 68 and '69 and the conductors 60b and 680 to the binding posts 16 and H, so that one switch will control one section or element in the control circuit and the other switch will control another section or element in the control circuit.

However, if desired, the switches may be connected in series in the control circuit by eliminating the conductors 60 and 680 and connecting the binding posts '68 and H by a bridging plate 15 as shown in dotted lines.

By reason of the foregoing operation of the switch 44 by the hook on the door and the operation of the switch 45 by the locking latch, it will be apparent that one of the switches will be open whenever the door is open or the lock is released, that both of the switches will be open when the lock is released and the door is opened, and that consequently the car cannot be operated unless the door is both closed and locked in closed position.

In some elevator installations it may be inconvenient to use the lock shaft, arm and roller mounted and supported by the lock as has heretofore been the usual custom, because it may be desirable to have a much longer shaft 28 than is feasible with mounting it only in the bearings in the lock. Where it is desired to have the operating arm 33 disposed some distance from the look, I have provided an extension shaft 28a having its one end connected to the outer end of the shaft 28 by means of an extension coupling 16, and having its end rotatably supported in a bearing 11 in the outer end of a supporting bracket member 78. The bracket 18 may be mounted upon the hatchway wall 19 in any suitable manner as by a plurality of bolts 88. With this construction the arm 33 may be mounted upon the extension shaft 28a instead of upon the shaft 28 and, when it is rotated by the action of the car stopping at the floor, the fixed extension coupling 16 will cause the shaft 28 to rotate with the shaft 28a and thereby move the locking latch 26 to its unlocked position. It will be readily understood that the bracket 18 will support the outer end of the extension shaft 28a and that that shaft will in turn support the outer end of the shaft 28 by means of the coupling 26 so that the shaft will be supported in a safe working position and the operating arm 33 may be located where desired. Hence it will be apparent that the lock may be mounted in almost any desired position.

Although I have illustrated and described only one specific embodiment of my invention, it is to be understood that modifications thereof and changes therein may be made without departing form the spirit and scope of the invention.

I claim as my invention:

1. A lock for an elevator door comprising a casing, a hook member immovably fixed on the door in position to be moved into the casing by the closing of the door, a locking latch for locking the hook in the casing, a spindle for supporting and operating the latch, a horizontal shaft rotatably mounted in the casing for operating the spindle, an arm attached to the shaft, means for raising the arm to operate the shaft into unlocking position, an insulating block mounted above the latch and the hook in the casing, two pairs of spring arm contacts mounted in the block with their lower ends depending near the hook and the latch, a bridging plate mounted on the nose of the hook member in position to engage and electrically connect one pair of the spring arm contacts when the hook member is in its door closed position, a second bridging plate, and means for mounting the second bridging plate on the spindle to cause it to engage and electrically connect the second pair of spring arm contacts when the spindle is operated to move the latch into its locking position.

2. A lock for an elevator door comprising a casing, a hook member immovably fixed on the door in position to be moved into the casing by the closing of the door, a locking latch for looking the hook in the casing, a spindle for supporting and operating the latch, a horizontal shaft rotatably mounted in the casing for operating the spindle, an arm attached to the shaft, means for raising the arm to operate the shaft into unlocking position, an insulating block mounted above the latch and the hook in the casing, two pairs of spring arm contacts mounted in the block with their lower ends depending near the hook and the latch, a bridging plate mounted on the nose of the hook member in position to engage and electrically connect one pair of the spring arm contacts when the hook member is in its door closed position, a second bridging plate, and means for mounting the second bridging plate on the spindle to cause it to engage and electrically connect the second pair of spring arm contacts when the spindle is operated to move the latch into its locking position, said arm having sufficient weight to over-balance the spindle, thus causing it to move the latch into locking position when the means for raising the arm is removed therefrom.

HARRY H. VAN'DERZEE.

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