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Patent Searching and Data


Title:
SPEED REDUCER FOR DOOR
Document Type and Number:
Japanese Patent JP2006144419
Kind Code:
A
Abstract:

To provide a speed reducer not put in speed reducing operation when closing a door at low speed but put in speed reducing operation only in closing operation at a fixed speed or more to obtain a speed reducing quantity proportional to speed without applying load to operation of closing again the rest after a stop while causing no load in opening operation.

A body device with a speed reducing member constituted to apply fixed load thereto when a gear is rotated, retractibly built in a case is mounted to the door, and a rack member is mounted to a frame body. The speed reducer is provided with an engaging/detaching mechanism having an engaging means for meshing the gear and a rack in the final stage of closing the door, and a detaching means for detaching the gear and the rack in a stage where the door stops or moves at a predetermined low speed. The engaging means is constituted to engage the gear and the rack using the grade of centrifugal force due to the closing speed of the door or constituted to engage them according to the grade of collision force between a projecting part of the body device and an abutting member of the rack member. The detaching means uses the detaching operation of the rack and gear by a detaching spring or by falling action caused by self-weight.


Inventors:
NISHITANI HITOSHI
Application Number:
JP2004000337131
Publication Date:
June 08, 2006
Filing Date:
November 22, 2004
Export Citation:
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Assignee:
NISHITANI HITOSHI
International Classes:
E05F5/02