Locks – Operating mechanism – Key
Patent
1996-02-12
1998-08-11
Gall, Lloyd A.
Locks
Operating mechanism
Key
70384, 70491, 70496, E05B 2708
Patent
active
057911819
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a novel locking system according to the preambles to claims 1 and 17 which has very useful properties and at the same time can be produced cost-effectively, and is therefore suitable to be a mass-produced product, particularly for use in motor vehicles and building fixtures.
A cylindrical lock whose secret key code can be changed and in which, instead of the key bit, at least two adjustment rings which can assume defined positions in the axial direction inside the lock cylinder are provided on the key shaft is known from DE 20 41 368 B2. In this instance, the adjustment rings of the key are allocated rotatable locking rings of the lock cylinder. Radially-oriented latching notches of the adjustment rings correspond with spring-loaded locking pins of the locking rings in such a way that it is only possible to operate the locking system if the key fits. This cylinder lock permits new programming of the code in a simple manner after insertion of the key; however, the structural design is very complicated and the lock assembly is correspondingly involved. The large number of intended code variations results in a likewise large number of latching notches, locking pins and springs, which leads to an increasing tolerance sensitivity. An embodiment of the described system in a lock cylinder having a comparatively small diameter hardly appears possible, so its use in motor vehicles is hardly an issue.
In DE 41 34 990 C1 a locking apparatus is described whose cylinder lock has a two-part locking core which is freely rotatable in the cylinder housing. Seated therein are blocking elements which are axially displaced, counter to the pressure of springs, by plungers of a key which can be inserted through a shaft. If the key code matches the code of the locking core, the latching recesses of the blocking elements form a common alignment directly beneath the latch of a blocking element, so that the two can enter into form-fitting engagement in the case that the key is rotated in order to operate the locking system. If a key which does not fit is used, the blocking element cannot leave the recess in the cylinder housing, which prevents a rotation of the locking core.
The described locking system can be programmed to a new code, but it requires an exchange, or at least a new arrangement, of the blocking elements. Because a specific blocking element is associated with each individual code (of the entire code of the locking system), assembly must be performed with the highest degree of carefulness.
The object of the invention is to develop a locking system which is distinguished by a simplified design and ability to be produced cost-effectively. Moreover, the locking core is intended to be programmable to the code of the key the first time the key is inserted, and/or the locking system is intended to be operable from one side--regardless of the code of the locking core and whether a key is completely or partially inserted from the other side--by a handle integrated into the locking system (e.g. for the purpose of emergency operation).
SUMMARY OF THE INVENTION
According to the invention, the above object is accomplished by a lock cylinder and a key which can be inserted into it and has plungers which point in directions of insertion, with the two-part latching element comprising parts which can be displaced toward each other and are fixed with respect to each other in a locking position. These parts, which are referred to as carrier and rider, are in form-fitting or frictional engagement. When a key that is able to fit is inserted, a latch opening cut into the rider faces a latch formed on a blocking element. The blocking element is seated to be radially displaceable in a recess of the locking core, and, in the zero position, extends into a further recess disposed in the housing which serves to block the locking system in the event that, when a key which does not fit is used, the latch of the blocking element cannot be pushed into the latching recesses of the individual c
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Sperber Alfred
Sperber Bernd
Gall Lloyd A.
Valeo GmbH & Co. Schliessysteme KG
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