| FR2588033A1 | 1987-04-03 | |||
| NL55474C | 1943-11-16 | |||
| DE1055996B | 1959-04-23 | |||
| US2179947A | 1939-11-14 |
| 1. | ) Additional security device to the traditional components of Yale type locks with flat key and cylindrical shape, characterized by the fact of being constituted by a little cylinder with circular section (3) located at the rear end and inside the rotating body (2) of the lock and held in its position by a spring (8), housing in the space ( 12) of the rotating body bearing transversally and orthogonally to its side surface, a pin with circular cylindrical shape (4) having an anchoring function, that houses at its free end an inlet shape (5), obtained from the back superior rear end of the fixed body (1) of the lock, from which it come out when the inserted key pushes with its tip the little cylinder (3) allowing, only in this case, to the rotating body to rotate and perform its function. |
| 2. | Device according to claim (1 ) characterized by the fact that the little cylinder (3) is crossed transversally by a keyhole (12) with circular section; inside which, at one end, the anchoring pin (4) is inserted and fitted about two thirds of its length with the remaining piece coming out from the housing (12), meanwhile from the other end of the keyhole (12) it is inserted the terminal part of a flexion spring, which applies a reentrant force and brings the anchoring pin (4) of the little cylinder (3) in the housing (5), when it is not pushed out by the key (13). 3) Additional security device, as in the previous claims, characterized by the fact that the anchoring pin (4) comes out from the housing (5) , when the key ( 13) pushes the little cylinder (3) just enough so that the bigger diameter of its circular section of the anchoring pin (4 ) crosses the border of the throat ( 15) allowing the mobile body (2) to rotate rispect the fixed one (1 ). |
A SECURITY DEVICE NECESSARY TO AVOID THE OPENING OF LOCKS IF THE KEY IS NOT COMPLETELY INSERTED INTO THE KEYHOLE.
Technical Field
The present invention concerns an additional security device for locks type Yale lock and similar ones, which does not allow the activation of the lock to perform its functions, if the key is not completely inserted into the keyhole.
Background Art It is well-known that it is possible to act upon a Yale lock with flat key or similar, using other occassionaly and not qualified keys, by searching with little longitudinal and translational movements of insertion and extraction of the keys from the keyhole, to obtain the right comkination for opening the lock. This operation is sometimes successfull, in particular when there exists wear and tear of lock elements thus missreading the shape of the key.
The object and important characteristics of the invention
The aim of this invention is to avoid the above drawbacks allowing the opening of the lock only when the key is completely inserted into the keyhole and thus
hampering or annulating all attempted combinations done with not qualified keys.
Another advantage of this invention is to obtain higher security and stability during key exchange in Yale locks functioning according to the "exchange key" principle, being these keys withdrawable only from a homogeneous series of assigned longitudinal dimensions.
The tasks and advantages shown above are accomplished by an additional device Yale-like, having cylindral shape and flat key, kept in its position by a spring and carrying an anchoring pin which does not allow the rotating body of the lock to rotate, if the tip of the key does not make it possible to push out the anchoring pin from an appropriate housing made on the fixed body of the lock.
Description of the drawings
The invention will be better understood, and other peculiarities will result in a preferred performance shape, shown as indicative title and not limited by the designs enclosed.
Here the reading shape elements of the key are not shown in order to make it clear and understandable such designs. Fig. A. shows a diagram of the lock as seen from a top-view, with the key partially inserted into the keyhole.
Fig.B. and C, show a magnified feature of the previous view, with two successive positions of the anchoring pin.
Fig.D. shows a section AA of fig.G, with several elements forming the invention.
Fig.E. shows a magnified and side-view of the mobile device (object of this invention). Fig.F. shows a section and side-view of the device of fig.E. Fig.G. shows a front and section view of the lock with the invented device applied.
The device presented here, object of this invention, shown in the above design, is formed by a little cylinder with circular section (3) provided by a vertical hole loop (16) from which, at one end, a pin (4) with circular shape will be inserted and fitted for about two thirds of its length, while the remaining will come out from the hole loop (16). At the other end of the hole loop (16), it is inserted the terminal part of a flexion spring (8) located in the little space ( 12) available in the rotating body (2) of the lock. In the fixed body (1 ) of the lock and at the rear top end, it is obtained by incision of a slot shape (5) that will house the pin (4) during inactivity of the lock, which allows the fixing of the mobile body (2) relatively to the fixed lock body (1 ) and avoids cross- rotation in between them.
The operation of the device considered here consists of the following fact : when someone's desire to insert any key (13); qualified or not, to open the lock and this does not enter into the keyhole completely along its full length, annulating the inaccuracy space (9), the pin (4) remains in the housing (5) not allowing any rotation of the mobile body (2) of the lock respects to that fixed (1) and thus releasing the key.
Instead, when a qualified key is inserted in and pushes with its tip (10) on the little cylinder (3), it pushes out the pin (4) from its housing just enough so that its bigger diameter will cross the border of the throat (15), allowing the mobile body (2) to rotate rispects that fixed ( l ).The spring (8) applies a re-entrant force and brings the anchoring pin of the component (3) into the housing (5) when it is not pushed by the key (13).