Door opening and closing device

Details Door opening and closing device Door opening and closing device

E - Fixed Constructions

05

F

E05F 3/04 (2006.01) E05F 3/10 (2006.01)

Patent

CA 2349689

A door opening and closing device adapted for use at reinforce glass door or front door for gentle and quick swivel when a door is opened and for slow rotation when the door is closed, wherein the device comprises: a shaft rotatably supporting a door and coupled to the door for integral rotation with the door; a piston inserted to a circumference of the shaft so as to vertically move along a lengthwise direction of the shaft; a connector for connecting the shaft with the piston for the piston to move vertically in response to rotary movement of the shaft; a housing for receiving therein the shaft and the piston and having an upper chamber and a lower chamber partitioned by the piston, each chamber filled with operation fluid; a first fluid passage formed at an inner wall surface of the housing for communicating the upper chamber with the lower chamber; and a check valve mounted at the piston for being opened when the piston is upwardly moved to allow the operation fluid in the upper chamber to move to the lower chamber and for being closed when the piston is downwardly moved to allow the operation fluid in each chamber not to communicate therebetween.

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