Locks – Operating mechanism – Key
Patent
1996-12-18
1998-07-07
Boucher, Darnell M.
Locks
Operating mechanism
Key
70380, 70492, 70 17, 70422, E05B 910
Patent
active
057751471
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a locking device with a locking cylinder, especially for a motor vehicle. In such device the key-operated rotation of the cylinder core is transmitted from a radial slide to a driver cooperating with lock elements, but is interrupted in the region of the driver when the locking cylinder is rotated by force because the latter is displaced by a push-rod against the force of a spring acting upon it. The push-rod is part of an overload catch having, in the adjoining structural component parts, a radial opening which encloses the push-rod and a radial recess which receives only the radial end of the push-rod. The radial recess is defined by stop cams which lift the end of the push-rod out of the radial recess during a rotation of the structural component part. Aside from controlling the radial slide, the push-rod has the function of fixing the cylinder guide in the housing when the cylinder core is rotated by means of the key, but causing the cylinder guide to run freely when the locking cylinder is rotated forcibly via a burglary tool or the like.
2. Description of the Related Art
In a known device of this type, DE-PS 40 41 134 C1, a radial slide is guided in the cylinder core so as to be displaceable. The push-rod belonging to the overload catch is pressed outward radially from the axis of the cylinder core by the spring loading of the radial slide since the radial recess for receiving the end of the push-rod is arranged at the inner surface of the housing which faces the cylinder guide. The radial slide projects axially beyond the inner end of the cylinder core and normally engages with coupling faces of the driver. When the overload catch is in its free-running position, the radial slide is displaced toward the axis of the cylinder core by the push-rod until it disengages from the coupling faces of the driver. In order to block the driver in the free-running position, an additional thrust bar is required in the driver and must be controlled by an axial pin of the radial slide. This axial control pin calls for a removal of material from the driver to allow for the radial movement of this control pin.
This known device is formed of numerous structural component parts necessitating tedious assembly and requiring considerable space. A reliable connection between the locking bar, which is displaceable in the driver, and the radial slide in the cylinder core is difficult. A relatively large clearance is required for unimpeded cooperation of the structural component parts.
In a locking device of a different type, EP 0 444 972 B1, the cylinder core which supports the spring-loaded tumblers is rotatably supported directly in the housing rather than in a cylinder guide. Therefore, there is also no push-rod which belongs to the overload catch and which is lifted out of a radial recess likewise belonging to the overload catch when a determined torque is exerted on the cylinder core and which accordingly sets the overload catch in its free-running position. Although there is a spring-loaded radial slide in this known locking device, this radial slide is positively controlled by a swivelable locking bar. The swivel axis of the locking bar is situated at the cylinder core and its head which is provided with a feeling nose engages in an axially parallel cut out portion of the cylinder core. This cut out portion extends up to the tumblers that are arranged in the cylinder core and controlled by the key. The tumblers must have additional lateral notches. The notches in the individual tumblers are so arranged that they are axially aligned with one another when the proper key is inserted into the cylinder core. The feeling nose of the locking bar can drop into the notches. A finger which extends as an axial continuation of the locking bar head drops into a radial groove of the driver (FIGS. 3, 7) or of the cylinder core (FIG. 11) and moves the radial slide into a coupling position with respect to the driver. A rotation of the cylinder core can
REFERENCES:
patent: 4854143 (1989-08-01), Corder et al.
patent: 5428978 (1995-07-01), Tsukano
patent: 5577409 (1996-11-01), Oyabu et al.
patent: 5640864 (1997-06-01), Miyamoto
Boucher Darnell M.
Huelsbeck & Fuerst GmbH & Co. KG
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