US1190851A - Safety device for locks. - Google Patents

Description

I. P. J. BIROT.

SAFETY DEVICE Foa LoKs. APPLICATION FILED NOV. 24.1913.

Lwwm. Patented Ju1y11,1916.

SAFETY DEVICE FOR LOCKS.

insonni.

Specification ol' Letters Patent.

Patented July lll, i916.

Application filed November 24, 1913. Serial N o. 802,588.

To all whom it may concern.'

Be it known that I, JEAN PIERRE JosErI-r Brno'r, citizen of the Republic of France, residing at Villa Roxane St. Lon, Bayonne, Basses-Pyrenees, in the Republic of France, have invented new and useful, Improvements in Safety Devices for Locks, of which the following is a specification.

lThis invention relates to improvements in safety devices for locks, said device comprising a stop piece which prevents the bolt being displaced and which may be moved aside by a supplementary bit of the key. The stop piece is mounted on the outside of the lock, that is to say, on the Outside of the casing which contains the usual mechanism and on the one or other face of this casing which allows of easily applying the device to existing locks. The casing of the Vlock preferably carries exterior wards with which the supplementary'bit of the key cooperates, which further increases the safety of the lock. The stop piece is preferably elastic and the supplementary bit of the key,

which is rigidly mounted on the key stem.

pushes back the said piece by acting on an inclined plane formed thereon. rlhe stop piece is also preferably provided with a screw threaded button and it is by means of this button that it locks the bolt so that it is sulicient to unscrew this button to put the safety device out of action.

The annexed drawing shows by way of example the safety device arranged according to the invention applied to a lock of any kind.

Figure l is a front view of the look. Fig. 2 is a section on line A-B of Fig. 1. Fig. 3 is a partial section on line D-C of Fig. l. Fig. 4 shows the same partial section with the key in the initial position of introduction into the lock. Fig. 5 is a similar partial section showing the position of the key after a half turn when it pushes back the stop piece.

The safety device is constituted as fol` lows: On one of the walls a of the lock casing, is screwed or riveted by one of its ends a plate spring Z2 forming a stop piece for the bolt o. This piece b carries at the other end a button Z which screws into the piece b and which engages in a corresponding cavity e of the bolt through an opening formed in the wall of the lock casing. Opposite the key hole f, and bolt and concentrically therewith stop b comprlses an annular part b1 interrupted at b2 and of which the ends b3 are beveled so that their faces opposed to wall a of the lock form an inclined plane therewith gradually receding from the wall a toward the said ends.

The key g comprises the usual bit it which serves for operating the bolt and a supplementary bit z' of which the end l can engage when the key is turned inthe space left free between the end 3 and the wall a. lThe supplementary bit z' is cut in any manner and on the wall of the lock on each side of the opening 7 are symmetrically placed guards or shoulders j of whichthe cutting corresponds to that of the supplementary bit z' so as to prevent turning any key which has not the properly cut bit z'.

The operation of the device is as follows: Vhen the lock is closed the stop or spring piece b for the bolt c is applied against the wall of the lock, the button CZ engages in the corresponding cavity of the bolt and blocks the latter. After having introduced the key, directly it is turned for opening the lock in the direction of the arrow, the end l of the supplementary bit i engages between the wall a of the lock and the eX- tremity b3 of the spring stop Z7 and in sliding on the inclined face of the circular part 1 forces the spring b to move away from the wall a and the button Z to pass out of its housing in the bolt. rlhe movement of rotation of the key being continued it acts on the bolt in the usual way while the end l of the bit holds the spring b separated from the wall a; of the lock and consequently the button CZ out of its housing until the initial turn of the key is terminated. At this moment, the key resuming the initial position the bit i ceases to act on the spring stop which is forced again against the wall of the lock and the button al retakes its place in a second housing of the bolt formed to receive it, if it is desired that the safety device should operate at each turn of the key. The closure is effected underthe same conditions. lt will be noted that with the safety means thus constituted the key must execute two distinct operations to open or close the lock.

The shape and size of the bit z' can be varied by Varying the shapes and sizes of the guards j mounted on the wall of the lock, and the width of the circular part 1 of the spring as well as its distance from the hole through which the stem of the key passes may be also varied at will.

In a series ofv similar locks diiierent bits Vcould beremployed for the keys of each of them.

They safety device can be applied to ther majority of locks for doors, drawers or lock andthe Wood orrmetal on which said lock is placed. F IfV the arrangement is such that the bolt ifs'retained by the stop vin the open position of the lock, it is impossible to close it without making use of the key. On the contrary the device canoperate'if desired at the last turn of the key only.l The lock can be used without the Voperation of the bolt stop if the button d is sufliciently unscrewed.

' The bolt stop device above described can be placed on locks adapted to be opened from both sides. yOne device only isV also used in this case but the keyv has two supplemen-` tary bits symmetrically arranged with regard tothe main'or usual bit. Y

Y The above'v described .arrangements ar only given'by way of example, the shapes and dimensions, materials, arrangements of detail and applications can vary without dei parting from the scope of the invention.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

l. Ina lock, in combination: a lock mechanism including a bolt, a casing containing said mechanism and a stop piece for the bolt, mounted on said casing, and having opposite the key hole and concentrically therewith an annular part interrupted at one point, said stop piece being adapted to be disengaged from the bolt by a supplementary bit of the key acting on said annular part, substantially as described and for the purpose set forth.

2. In a lock, in combination, a lock mechanism, including a bolt, a casing containing said mechanism, a stop piece mounted on the outside of said casing and adapted to be disengaged from the bolt by a supplementary bit of the key, and guards mounted on the outside of the lock casing and having a cut corresponding to that of the supplementary bit of the key, substantially as described and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.l

JEAN PIERRE JOSEPH BIROT.

Witnesses A.: LINDQUET, R. JACOBE.

Copies lof this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

' Washington, D. C.

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