Device for locking a sliding door of a showcase having a frame c

Details Device for locking a sliding door of a showcase having a frame c Device for locking a sliding door of a showcase having a frame c

1989-07-17

1991-02-12

Wolfe, Robert L.

Closure fasteners

Magnetic

292144, E05C 1756

Patent

active

049918877

ABSTRACT:
Sliding doors of showcases are normally locked by safety locks, the installation of which must, however, be very precise when a play of the sliding door in rest position is to be avoided. By the new device a safe locking of a showcase is also to be achieved without having to pay attention to an especially precise installation. The sliding door (4) is held in the closed position and rest position, respectively, by permanent magnets (7) provided at the showcase, the magnetic force of which can be neutralized by an electric coil and direct current flowing therethrough. As the installation of the permanent magnets must not be so precise, such a showcase can be built up also outside a workshop, for instance on the building site. Furthermore, in this way the safe closure of sliding doors can be achieved when at positions where known locking means are difficult to reach.

REFERENCES:
patent: 3431062 (1969-03-01), Melgaard
patent: 4682801 (1987-07-01), Cook
patent: 4826223 (1989-05-01), Geringer
patent: 4840411 (1989-06-01), Sowersby

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