Title:
DOOR CLOSER
Document Type and Number:
WIPO Patent Application WO/2006/068005
Kind Code:
A1
Abstract:
A door closer capable of securing a large door closing force in a wide range up to a fully closed position or a position immediately before the fully closed position without increasing a load thereon for opening a door. In closing the door, the elastic deformations of springs (8) and (9) produced by a door opening operation are partly maintained in a deformed state until the door is fully closed or immediately before the door is fully closed, and then the deformed state is released to reset the springs (8) and (9) to an initial state before the door opening operation. A boosting piston (10) is moved when the door is opened to elastically deform the springs (8) and (9) in association with a piston (7) so as to maintain and release, as a part of the elastic deformations, the elastically deformed parts of the springs (8) and (9) due to the movement of the boosting piston (10) in s deformed state until the door is fully closed or immediately before the door is fully closed when the door is closed.
Inventors:
ISHIDA KOHJI (JP)
Application Number:
PCT/JP2005/022843
Publication Date:
June 29, 2006
Filing Date:
December 13, 2005
Export Citation:
Assignee:
RYOBI LTD (JP)
ISHIDA KOHJI (JP)
ISHIDA KOHJI (JP)
International Classes:
E05F3/10; E05F3/18
Foreign References:
| JPS63195088U | 1988-12-15 | |||
| JP2977527B2 | 1999-11-15 | |||
| JP3011701B1 | 2000-02-21 |
Attorney, Agent or Firm:
Fujimoto, Noboru (15-14 Minamisemba 1-chome, Osaka-sh, Osaka 81, JP)
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