Closure fasteners – Bolts – Spring arm
Patent
1993-12-27
1995-11-21
Lindsey, Rodney M.
Closure fasteners
Bolts
Spring arm
2922515, 292307B, 292201, 70 63, 206309, E05C 1906
Patent
active
054680310
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a lock mechanism comprising a lock member which is normally held in an engaged position to be magnetically operated from said engaged position to a disengaged position.
The lock mechanism of the invention has been developed particularly for a safety device for boxes for compact discs, which is used in the retail trade for blocking the box so that it cannot be opened easily for theft of the compact disc, or such theft in any case cannot take place without considerable difficulties. In one safety device which has appeared on the market in order to protect boxes for compact discs the lock mechanism is of the type referred to and comprises a metal pin guided for reciprocating movement and biassed to the engaged position by a helical spring said pin being provided with a metal head which is attracted by a magnet when it is desired to disengage the lock mechanism. In the engaged position the pin engages an aperture provided in one of the narrow sides of the box. This prior art lock mechanism is safe and reliable, but it is rather expensive in manufacture.
In the compact disc retail trade there is a desire of minimizing the costs and efforts for protecting the compact discs against theft, and accordingly there is a demand for cheap protecting devices, which are easy to handle in the retail store and provide an acceptable protection of the compact discs, which means that there is a demand for a cheap and effective lock mechanism for use with such protecting devices.
SUMMARY OF THE INVENTION
The invention provides a lock mechanism of the type referred to above which combines safety with simplicity and low manufacturing costs, wherein the lock member comprises a spring blade an engagement member projecting therefrom transversely to the flat side of the spring blade at one end thereof, the spring blade being fixedly secured at the other end thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to explain the invention in more detail an embodiment thereof will be described below reference being made to the accompanying drawings in which
FIG. 1 is a side view, partly a vertical cross-sectional view, of a safety device with the lock mechanism of the invention
FIG. 2 is a fragmentary vertical cross-sectional view of the lock mechanism when it is in the engaged position,
FIG. 3 is a view corresponding to FIG. 2 showing the lock mechanism in the disengaged position, and
FIG. 4 is a perspective view of the spring with the engagement member forming an integral part thereof.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The safety device disclosed in the drawings is intended for a box for a compact disc (CD). It is injection molded of plastics material, for example polycarbonate, which is a strong and for the purpose well suited plastics material. Preferably, the plastics material is crystal-clear. The device is formed as a flat rectangular frame having three walls 10, 11 and 12 which form narrow sides of the frame, a wall 13 at one flat side of the frame, forming an opening 14, and two triangular corner portions 15 and 16 and a rail 17 at the other flat side of the frame, said triangular corner portions connecting the walls 10, 11 and 11, 12, respectively, the rail 17 being located at the narrow side having no wall. At the open narrow side of the frame the wall 13 is retracted in the longitudinal direction of the walls 10 and 11 in relation to the rail 17 for productional reasons, and for the same reasons apertures congruent with the corner portions, are provided in the wall 13. The frame is provided with one or more sensors (not shown) for affecting an electric alarm system when the safety device is carried through the exit of a retail store.
The CD-box is inserted into the safety device by being pushed leftwards as seen in FIG. 1 into the frame through the open narrow side to the right in FIG. 1. When the box is located in the frame it is encircled by the frame along three edges and at the two flat sides by the wall 13 at one flat side and by the corne
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Lindsey Rodney M.
MW Trading APS
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