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Title:
SAFEST KEY FOR THEFT PREVENTION ATTACHED TO ENTRANCE DOOR HAVING NO KEYHOLE
Document Type and Number:
Japanese Patent JP2005030185
Kind Code:
A
Abstract:

To provide an entrance door having no key hole on the outdoor surface of the entrance door having an handle at the right side or the left side of the door for preventing any ingress of a thief by installing a theft prevention key inside the frame of the entrance door which is the safest key for the theft prevention.

An S-pole of an external permanent magnet 10 absorbs an N-pole of a circular permanent magnet 22 of a device 6 which extracts a latch bolt permeating through a thick aluminum plate stuck to the outdoor side of the entrance door. When the circular permanent magnet 22 is pulled toward the external permanent magnet 10, a drive belt 4 is also pulled and the latch bolt 1 is extracted from a strike 2. When the external permanent magnet 10 is separated from the position of a device 6 extracting the latch bolt of the entrance door, a force of propulsion acts between M1 and M2 because two circular permanent magnet M1 (N pole or S pole) and M2 (N pole or S pole) are set to the same polarity, and then the latch bolt 1 is inserted to a strike 2 by the propulsive force and the key is automatically set to a locked state.


Inventors:
TOYODA YUKIHIRO
Application Number:
JP2003000293966
Publication Date:
February 03, 2005
Filing Date:
July 12, 2003
Export Citation:
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Assignee:
TOYODA YUKIHIRO
International Classes:
E05B47/00; E05B45/06; (IPC1-7): E05B47/00; E05B45/06