US1423484A - Door lock - Google Patents

Description

H. Mc'CARTY.

DOOR LOCK. APPLICATION FILED-JULY 7, I921.

Patented July 18, 1922.

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HOMER BAR IVICCARTY, 0E OGDEN, UTAH, ASSIGNQE TC! 9 K ELEVATQR SAFETY LOCK COMI ANY, OF OGDEN, U'lAI-ll, A GOREDRATION.

DOOR- LOCK.

Application filed July '7,

To all whom it m an copes-mi:

Be it lrnown that l, i-loMn'e Ban Mot/AMY, a citizen of the United States, residing at Ogden, in the county of Weber and State of Utah, have invented new and useful Improvements in Door Locks, of which the following is a specification.

My invention relates to that class of locks designed especially for use in connection with the landing doors of elevator shafts or wells, and the primary object of the invention is the provision of a safety device in connection with the doors of the shaft or well which will prevent operation of the electrically controlled elevator unless the doors are closed, thus preventing accidents, and insuring that all of the doors will be closed while the elevator is in motion.

With this object in view the invention consists in certain novel combinations and arrangements of parts involving electrical connections with the power, or control of the electric power circuit for the elevator, asiwill be hereinafter more fully described and claimed.

the door frame is shown in section to disclose the operating parts therein, the door being shown in locked position, and the latch bar shown by dotted lines in position to permit opening of the door.

Figure 2 is a transverse sectional view' through the casing and interior parts, on line 2-42 of Figurel,

Figure 3 is a transverse, horizontal sectional view through the casin '9.

In the preferred form of the invention as illustrated, the metallic latch plate 1 is attached to the door designated by the letter D, which door is utilized at the opening in the elevator shaft, one for each floor of the building, and of the sliding type. The door is accessible for opening and closing from the interior of the shaft, or from the elevator, and the plate 1 is attached at the shaft Specification of Letters Patent.

Patented July 18, T3 22.

Serial No. 482,9?3.

side of the door as shown.- The operating latch bar 2 is of metal and pivoted at 3 within the latch plate at, and the latch bar has a handle 5 projecting therefrom to be grasped by the elevator operator for manipulating the lock and also for sliding open or closing the door D. The latch plate is fashioned with an offset guide portion 6 having angularly disposed guide walls, and the attaching plate 1 is provided with a guide strap 7 secured thereto by screws for guiding and limiting the movement of the latch bar as it is swung on its pivot 3. The hook S fashioned at the end of the latch bar is designed to pass through an opening in the casing 9 and is giiiided therethrough by the beveled edge 10 at the mouth of the opening against which the rounded edge 11 of the latch bar may contact as the latch bar passes through the opening,

The casing 9 is secured in proper position to the frame F of the door and is provided with a lug 12 for co-action with the latch hook S in holding the door locked when the door is closed. In 'gure i it will be noted that the 1m 7 7 arm of the pivoted latch, at the left of the pi vot, is of suiiicieut weight to insure the normal, horizontal position of the latch bar, in order that the hook 8 may swing up into position as shown to engage the locking lug 12 when the hooked end of the latch is projected through the opening in the casing, and thus the door is automatically locked as it slid to closed position.

In cooperation with the locking latch-hook I employ electrical connections that are included in. the control circuit of the electrically operated elevator, and these connections are controlled by a gravity operated lgiumper arm which loosely pivoted on a shaft i l supported in the casing 9, the weight of this bumper arm being sufficient to swing the arm downwardly when not supported by the hooked end of the latch bar. I

On the same shaft 14 is loosely pivoted a carrier or carrier-arm 15, in the form of a flat plate of suitable material and disposed above the bumper arm 13 and its weight. At the upper and lower faces of this carrier arm are insulation plates 16 and 17 respectively, the lower plate 17 forming also a wear plate or cushion for the lug 18 on the bumper arm that engages this lower plate and holds the carrier plate in horizontal position as indicated. The pivoted carrier also has a conductor plate 19 attached at its upper side, screws or bolts 20 and nuts 21 being utilized to secure this plate to the carrier, and these screws passing through the conductor plate, insulation plates and carrier secure these parts together in order that they may swing as a rigid member on their pivotal shaft 14.

Near the upper end of the casing 9 is secured an insulated bar 22, which forms a rigid support for the terminals 23 and 2% of the wires 25 and 26 of the electric control circuit for the elevator, the wires being led to the casing through tubes as 27 in usual manner.

From an inspection of Figure 1 it will be apparent that when the door is closed the latch-hook S encounters the bumper arm 13 and the latter is swung upwardly on its pivot 14:. As the bumper arm swings upwardly its lug l8 encounters the insulation plate 17 of the carrier, and the carrier, with its conductor plate 19 is swung upwardly on its pivot is causing the conductor plate to contact with the ends of the spaced terminal posts 23 and 2-1- to close the circuit of which the wires 25 and 26 form a part. While the circuit is closed the control circuit of the elevator is operative and the elevator may thus be operated. When the elevator reaches a selected land ing, the handle 5 is grasped by the elevator operator and the latch swung on its pivot 3 and by continued power applied to the handle the door is slid to the left in Figure 1 to open position. The first, pivotal, move ment of the latch bar is indicated by dotted lines in Figure 1 wherein the handle end of the latch bar has swung upwardly, and the hooked end has turned downwardly, encountering the lug 13 on the casing, and the hook is in position to be withdrawn through the opening of the casing. lVhen the sup port of the hook 8 has been withdrawn from the weighted bumper arm 13, the latter swings by gravity, downwardly and is stopped by the lug 1.3, where it remains in position closing the opening in the casing and in position to be engaged by the hooked end 8 when the door is again closed. After the bumper arm has fallen away from supporting position for the carrier arm, the latter also swings by gravity on its pivot R and falls until the end of the carrier 15 encounters the stop 15 fixed at the inner side of one of the casing walls. The movement of the carrier disengages the conductor eas es plate from the two terminal posts and the circuit is broken, thus rendering the elevator inoperative until the circuit is again closed by the action of closing the door I).

From the above description taken in connection with my drawings it will be apparent that I have provided a safety device for elevators that is comparatively simple in construction and operation, which may be manipulated with facility, and which is reliable and efficient in the performance of its required functions.

javing thus fully described my invention, what I claim as new and desire to secure by Letters Patent is l. The combination with a pivoted door latch having a hooked-end, of a casing adapted to receive said hooked end, a weighted bumper arm pivoted in the casing in the path of said hooked end, a carrier pivoted in said casing and adapted to be held uplifted by said bumper arm, stationary terminal posts within said casing forming art of an electrical connection in a control circuit, and a conductor plate on said carrier for contact with said posts.

2. The combination in an elevator door locking mechanism with a fixed casing and electrical connections therein formingpart of an electric control circuit, of a pivoted door latch having a hooked end to project through an opening in said casing, a gravity operated, pivoted bumper arm within the casing in the path of said hooked end, a pivoted carrier within the casing having a conductor plate and terminal posts forming part of said electrical connections for co-action therewith, and means on said bumper arm for engaging said carrier to hold the conductor plate in contact with said posts.

3. The combination in a door locking mechanism including electrical connections forming part of a control circuit, of a casing and terminal posts therein, a shaft within the casing, a carrier pivoted on said shaft and a conductor plate on said carrier ada Jted to contact with said osts a wei 'ht l a b ed bumper arm pivoted on said shaft and a lug on said arm to engage and hold said carrier in uplifted position, a sliding door and latch bar pivoted thereon, a hooked end on said latch bar adapted to be projected through an opening in said casing, a locking lug on said casing for the hooked end, and said hooked end adapted to hold said bumper arm and carrier in uplifted position, for the purpose described.

HOMER BAR MOCARTY.

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