Title:
APPARATUS FOR ADJUSTING ATTRACTION OF MAGNET
Document Type and Number:
Japanese Patent JPS52146039
Kind Code:
A
Abstract:
PURPOSE: To make it possible to adjust attractive force thorugh reduction in the attraction of a magnet itself by means of an opposite spring force in a fire proof door designed for locking utilizing the attraction of a magnet when no fire is present.
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Inventors:
KIMURA SHIYOUJI
Application Number:
JP6215076A
Publication Date:
December 05, 1977
Filing Date:
May 27, 1976
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
E05C17/56; A62C2/24; H01F7/02; (IPC1-7): A62C3/14; E05C15/02; E05C17/56