Ingersoll SC71 Patent

UNITED STATES PATENT OFFICE

2,519,808 Patented Aug. 22, 1950

DOOR LOCK

Leonard Weare Young, Moor Park, and Jack William Taylor, New Denham, England,  assignors to Ingersoll Limited, London, England

Application September 9, 1947, Serial No. 772,924

In Great Britain June 5, 1946

10 Claims (CL. 70-151)

This invention relates to a door lock and more particularly to an improved lock mechanism which provides a simplified arrangement for locking and unlocking a door by means of a key and an associated mechanical arrangement to secure the bolt and prevent unauthorized withdrawal.

The object of the invention is to provide a door lock construction which is compact, simple in construction and reliable in operation, and which will automatically deadlock when the bolt is moved to projected position. A further object is to provide improved means for preventing the retraction of the bolt except under proper key operation and to provide a novel arrangement of cams, detents and springs which cooperate to accomplish the foregoing objects.

The invention includes a casing, a bolt mounted for movement between projected and retracted positions, a detent movable to block retraction of the bolt, a cam arranged to hold the detent retracted and to permit it to move into blocking position, spring means to urge the cam to permit the detent to block, and an operator movable by a key or by engagement with the strike to hold the cam in the position permitting free withdrawal of the bolt.

Detailed description of the preferred embodiment follows with reference to the accompanying drawings.

Figure references: Fig. 1 is a sectional elevation showing the lock assembly; Fig. 2 is an end view of the bolt and detent assembly;

Fig. 3 is a sectional plan view showing the cam and operator; Fig. 4 is a detail showing the keeper engagement.

Operation: The key rotates a plug which engages a cam surface to move the operator to a first position holding the stopwork cam in a first position, thereby permitting the bolt to be withdrawn. When the bolt is projected into the strike the operator is moved to a second position permitting the cam to move to its second position where the detent is released and blocks retraction of the bolt, thus deadlocking the bolt.

Claims defining the scope of the invention follow.

[U.S. PATENT DOCUMENT PAGE — (Patent No. 2,510,898 referenced in image header)]

Description

This specification relates to a lock mechanism provided with a cam and deadbolt system adapted to cooperate with a keeper to secure a door.

A load cam and an operating cam are arranged in the casing and are urged by springs to certain positions. The key-actuated plug when rotated engages cam surfaces which move an operator and the stopwork cam to permit withdrawal of the deadbolt. A keeper cooperates with the bolt and with an operator member so that when the bolt is projected the operator may be moved by engagement with the strike into a position permitting the stopwork cam to move and permit the detent to block retraction of the bolt.

The deadbolt can be withdrawn only when the plug is rotated by the proper key which aligns the cams and moves the operator into the first position. When the bolt moves into the projected position the operator is permitted to move to the second position by engagement with the strike, the stopwork cam is released by the spring means to move into its second position, and the detent moves into blocking position to prevent bolt retraction.

The structure includes cooperating surfaces on the cams and on the plug which cause predetermined sequencing of movement so that the bolt and detent operate reliably to lock the door automatically when the bolt reaches projected position and to allow retraction only by key operation.

Detailed parts described include: a casing, bolt, detent, cam means, stopwork cam, operator, springs, keeper, plug and key. Reference is made to figures showing section and plan views of the cams and bolt assembly.

Transcribed text (Claims excerpt from U.S. Patent No. 3,519,805)

5. An automatic deadlock for cooperation with a key-actuated lock mechanism, said deadlock comprising: a casing, a bolt mounted in said casing for movement between projected and retracted positions, a detent mounted in said casing for movement into and out of a position blocking retraction of said bolt, a cam mounted in said casing for movement between a first position holding said detent in retracted position and a second position permitting movement of said detent into said blocking position, spring means urging said cam toward said second position, a stopwork cam mounted in said casing for movement between a first position holding said cam in said first position and a second position permitting movement of said cam into said second position, spring means urging said stopwork cam toward said second position, and an operator mounted in said casing for movement between a first position holding said stopwork cam in said first position and a second position permitting movement of said stopwork cam into said second position.

6. An automatic deadlock as defined in claim 5, wherein said operator comprises a key-actuated member.

7. An automatic deadlock as defined in claim 5, wherein said operator comprises a member movable independently of said key-actuated member.

8. An automatic deadlock as defined in claim 5, wherein said operator comprises a member movable independently of said key-actuated member and said key-actuated member comprises a cylinder lock.

9. An automatic deadlock as defined in claim 5, wherein said operator comprises a member movable independently of said key-actuated member and said key-actuated member comprises a cylinder lock having a plug rotatable by a key.

10. An automatic deadlock as defined in claim 5, wherein said operator comprises a member movable independently of said key-actuated member and said key-actuated member comprises a cylinder lock having a plug rotatable by a key, said plug having a cam surface engageable with said operator to move said operator into said first position.

11. An automatic deadlock as defined in claim 5, wherein said operator comprises a member movable independently of said key-actuated member and said key-actuated member comprises a cylinder lock having a plug rotatable by a key, said plug having a cam surface engageable with said operator to move said operator into said first position, and said operator being movable into said second position by movement of said bolt into projected position.

12. An automatic deadlock as defined in claim 5, wherein said operator comprises a member movable independently of said key-actuated member and said key-actuated member comprises a cylinder lock having a plug rotatable by a key, said plug having a cam surface engageable with said operator to move said operator into said first position, and said operator being movable into said second position by movement of said bolt into projected position, said operator being movable into said second position by engagement with a strike.

13. An automatic deadlock as defined in claim 5, wherein said operator comprises a member movable independently of said key-actuated member and said key-actuated member comprises a cylinder lock having a plug rotatable by a key, said plug having a cam surface engage able with said operator to move said operator into said first position, and said operator being movable into said second position by movement of said bolt into projected position, said operator being movable into said second position by engagement with a strike, and said operator being movable into said second position by engagement with a strike, and said operator being movable into said second position by engagement with a strike, and said operator being movable into said second position by engagement with a strike, and said operator being movable into said second position by engagement with a strike, and said operator being movable into said second position by engagement with a strike.

[U.S. Patent No. 3,215,808 — page excerpt]

The deadlock is arranged to cooperate with a keeper and to function with an operating cam and springbolt arrangement. When the bolt is moved to projected position by operation of the cylinder or latch mechanism it engages the keeper and causes the operator to move to a position which permits the stopwork cam to allow the cam to move to a position releasing the detent so that the bolt is held against retraction. The device includes means to permit withdrawal of the bolt only when the key rotates the plug to move the operator into the first position and thereby hold the stopwork cam and cam in positions permitting retraction.