Locks – Special application – For antitheft signaling device on protected article
Patent
1991-02-18
1992-09-08
Luebke, Renee S.
Locks
Special application
For antitheft signaling device on protected article
351111, 70 34, G02C 1100
Patent
active
051448203
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an anti-theft device for spectacle frames intended for use in opticians' shops to prevent scrupulous persons from walking away quite impudently with a spectacle frame without having paid the required price therefor.
More particularly the anti-theft device of the invention is of the type comprising a body to be clamped to one bow of the spectacle frame, wherein clamping means can be operated manually by means of a special tool only when the body is to be mounted and demounted, said body being provided with a sensor affecting an anti-theft system.
Anti-theft devices of this kind are previously known, and one embodiment thereof is shown and described in FR-A-2,445,538. In this embodiment the body clamped to the bow provides a purely mechanical locking of the bow so that it will be held in the position of use thereof and cannot be folded against the rest of the spectacle frame as is done when spectacles are inserted into a cover, a bag or a pocket. Such an anti-theft device of the purely mechanical type is relatively bulky and prevents the spectacle frame from being tried on. Therefore, it is necessary at each try to remove initially the anti-theft device in order that the customer can try the spectacle frame on in a proper manner.
The purpose of the invention is to provide an anti-theft device of the kind referred to above which cannot be removed by the customer and can be retained on the bow when the spectacle frame protected against theft is being tried on, and additionally can be easily handled by the shop attendants. For this purpose the anti-theft device of the invention has obtained the characteristics as described in the claims.
In order to explain the invention in more detail two embodiments thereof will be described below reference being made to the accompanying drawings in which
FIG. 1 is a fragmentary perspective view of a spectacle frame provided with the anti-theft device according to the invention in one embodiment thereof,
FIG. 2 is a exploded longitudinal cross-sectional view of the anti-theft device,
FIG. 3 is a longitudinal cross-sectional view of the anti-theft device in the mounted condition,
FIG. 4 is a view of a cover attached to the anti-theft device, as seen along line IV-IV in FIG. 3,
FIG. 5 is a vertical cross-sectional view of the anti-theft device illustrating the mounting and demounting, respectively, thereof, and
FIG. 6 is a perspective view, corresponding to FIG. 1, disclosing a second embodiment of the anti-theft device of the invention.
The anti-theft device in FIGS. 1 to 5 comprises a body formed as a sleeve 10 open at one end thereof, which has rectangular cross-sectional shape and preferably is made of plastics, for example poly carbonate. On one broad side thereof the sleeve is provided with a cover 11 of the same material as the sleeve, said cover being attached to the sleeve by ultrasound welding. The sleeve 10 has opposing longitudinal slots 12 in the two narrow sides thereof, which are big enough to allow the bow 14 of a spectacle frame 13 to be passed through the slots. Inside the sleeve there is provided a slide 15 displaceable therein of the same material as the sleeve and the cover. At the inner end the slide is bevelled as a ridge at 16, and the slide has a threaded blind hole 17 opening at the other end of the slide. A screw 18 preferably also consisting of plastics, for example an acetal resin, such as POM, engages the blind hole and has a head 19 formed as a circular disc, a smooth neck 20 being provided between the head and the thread of the screw. This smooth portion is provided in order that the screw thread will not be too long considering the fact that the shrinking of poly carbonate and POM are different (0.5 and 2.5%, respectively). Considering existing tolerances this could have the consequence that a screw which is too long will jam in the threaded hole. The head forms a shoulder 21 slightly spaced from the edge of the head, and an excentrically located non-circular pin 22 projects from the head inwardly of the shoulder.
The sc
REFERENCES:
patent: 4438642 (1984-03-01), De Jong
patent: 4991413 (1991-02-01), Arnaldo
Boucher D.
Luebke Renee S.
M W Trading APS
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