Locks – Special application – For antitheft signaling device on protected article
Patent
1998-04-20
1999-08-03
Barrett, Suzanne Dino
Locks
Special application
For antitheft signaling device on protected article
206 15, 70276, E05B 6500
Patent
active
059310316
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a locking system that is intended to prevent the theft of articles from shelves or to prevent withdrawing an article from a housing that contains it, for articles such as cassettes, video cassettes, compact disks, CD-ROMs, eyeglasses, bottles, sets of bottles, etc.
SUMMARY OF THE INVENTION
In the state of the art, several solutions are known, particularly a locking system described in French Patent No. 2,678,907. The device described in this patent is generally satisfactory. The purpose of the invention is to further simplify the embodiment by reducing the number of parts, and by giving the parts a profile that makes it possible to reduce the cost of the molding and the assembly. Another purpose is to further increase the effectiveness of the system against tampering attempts, by improving the mechanical resistance.
To this effect, the invention more particularly concerns a locking system of the type comprising a fixed part that is integrally connected to a housing having a slot for the introduction of the article to be protected, as well as a movable part having an abutment that can partially close the introduction slot in the locked position. In addition, the system comprises a means that can prevent the displacement of the movable part without the use of a specific tool. The fixed part has a guide at its back that extends along a substantially longitudinal direction. In front of this guide, a protuberance has a hole that comprises a substantially longitudinal back segment, which is extended by an inclined segment extending to the top edge. The movable part comprises a hollow part having, in proximity to its back end, a transverse partition perforated by a slot. This slot has a section that is complementary to the section of the guide provided on the fixed part. In its midsection, the movable part comprises a transverse projecting rod that can work in cooperation with the hole of the fixed part so as to ensure the guiding of the movable part in, first, a longitudinal movement, then an oblique movement.
Advantageously, the locking system according to the invention comprises a blade running along the top face of the movable part in a substantially longitudinal direction--of which one end is integrally connected to the back part of the movable part, and the front part is free--and which extends, at rest in the locked position, against an abutment provided on the protuberance of the fixed part.
According to a preferred embodiment, the free end of said blade has a cutting edge. This characteristic is intended to prevent accidental unlocking when a violent shock causes the blade to vibrate.
According to an advantageous variant, the system comprises a spring that bears against the fixed part and against the movable part, so as to facilitate the displacement of the movable device after unlocking.
According to an advantageous embodiment example, the spring is housed in an inclined hole provided in front of the protuberance of the fixed part.
According to another embodiment variant, the protuberance of the fixed part has an extension that projects out of the front face and that works in cooperation, in the locked position, with a housing provided for this purpose in the front face of the movable part.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be better understood after reading the description that follows and that is based on the drawings, in which:
FIG. 1 represents a longitudinal cross-sectional view of the locking system in the closed position;
FIG. 2 represents a perspective view of the fixed part;
FIG. 3 represents a longitudinal cross-sectional view of the locking system in the open position.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The locking system comprises a fixed part (1), integrally connected to the housing, and a movable part (2). The fixed part, constituting an extension of the housing, is obtained by the molding of the housing, not shown in the figure. On the back of the fixed part there is a guide (3) that ex
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Barrett Suzanne Dino
Feit Irving N.
Fors Brance S.A.
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