Importance

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Abstract

The invention is to provide a door closer capable of easily adjusting a flow rate of working oil while utilising a cam type advantage of having high torque just before a door is fully closed. A door closer includes a main shaft (3) rotated with opening and closing operation of a door, a main spring (16, 17) for producing a closing force, and a buffer piston (10) for running working oil into a flow control path (9) in order to buffer door closing operation, wherein the main shaft (3) is provided with a cam (12) for elastically deforming the main spring (16, 17) at the time of door opening operation and being subjected to the closing force of the main spring (16, 17) at the time of door closing operation, and a rack (21) as a buffer driving part for moving the buffer piston (10) according to opening and closing operation of the door provided to the main shaft separately from the cam. Specifically, a slide-type door closer configured such that a distal end of an arm, which is rotated integrally with the main shaft (3), is guided along a rail and is slid.

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First Claim