Closure fasteners – Bolts – Sliding
Patent
1980-03-18
1982-10-12
Wolfe, Robert L.
Closure fasteners
Bolts
Sliding
29216922, 292DIG61, 70120, E05B 6506, E05C 112
Patent
active
043535828
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a door lock in which the follower, the spring bolt and the tumbler are each held in the desired positions by means of a device designed without special bias while they nevertheless may exert resilience, and the lock case portions disposed in parallel opposed relationship have sleeves above and below the handle follower, and the two case portions are secured to each other by undercuts or by engaging tabs.
In the known door locks the follower is held under tension by variously designed steel springs such that the door handle, whose square extends through the follower, is held in a predetermined position and returns to the initial position under spring load after its actuation.
Upon actuation of the door handle a predetermined spring force holding the follower in its initial position must be overcome to withdraw the spring bolt by the limited radial movement of the follower. By the withdrawal of the spring bolt the locking action of the spring bolt is eliminated and the door can be opened.
The spring of the spring bolt always urges the spring bolt into closing position. The tumbler spring likewise exerts a bias on the tumbler to urge it into a position locking the dead bolt.
The spring of the spring bolt and the tumbler springs are dimensioned such that their spring action can be easily overcome, firstly by the slope of the spring bolt head and secondly by the rotary movement of the key whereby the key bit lifts the spring-loaded tumbler out of its arresting position to allow the dead bolt to be shifted forward.
The follower spring designed as a spiral spring or as a so-called flat spiral spring in all embodiments is designed such that the follower spring is arranged in the lock case independently of the follower and transmits its spring action to the follower via more or less bias. The spring of the spring bolt is a flat spiral spring or flat spring and is positioned at a suitable location in the lock case. The same applies to the tumbler spring.
In simple so-called staple locks the springs for the spring bolt and for the tumbler are joined to a combination spring and manufactured in the form of a bent leaf spring. In some embodiments this spring is supported or mounted at a suitable location in the lock case. In further embodiments the combination spring is supported directly on the dead bolt.
In order to offer a possibility of mounting door plates, roses or the like bores both in the lock case bottom and in the lock cover are provided in most types of locks especially in mortise locks. However, all these bores are dimensioned such that any screws or the like extending therethrough will have much clearance. There cannot be mention of a guiding function.
The known lock constructions are relatively expensive to manufacture and partially consist of expensive individual parts. In order to cut expenses the most important functional parts have been modified in a not particularly ideal way. Despite all attempts towards less expensive manufacture certain manual operations cannot be eliminated altogether, and the desire to cut costs ultimately has adverse influences on the quality. Dimensional tolerances in an order of magnitude that is hardly still acceptable are the inevitable consequences.
The invention seeks to overcome these difficulties. The invention as characterized in the claims solves the problem of providing a door lock comprising two case parts disposed in parallel opposed relationship in which the follower is designed as a thermoplastic injection molded part resilient in itself such that, with the follower mounted in the lock case in inoperative position, a partial surface of the follower body bears against a stop face provided in the lock case, and a follower portion extending like an arm from the follower body resiliently rests either indirectly or directly on a further abutment provided in the lock case, or bears against the case wall, upon radial rotary movement of the follower so as to be partially bent inwardly or outwardly and releases lateral shifting of the spring bolt,
REFERENCES:
patent: 442982 (1890-12-01), Keil
patent: 1744960 (1930-01-01), Garbell
patent: 2924474 (1960-02-01), Lange
patent: 3773370 (1973-11-01), Jerile
patent: 3797870 (1974-03-01), Beckman
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