| 摘要 |
Provided is a door closer which makes use of the advantage of cam-types of having high-torque immediately prior to complete door closure, while also making it easy to adjust hydraulic-fluid flow. A door closer equipped with a principal shaft (3) for rotating according to the opening/closing operation of the door, main springs (16, 17) for producing closing force, and a shock-ab - sorbing piston (10) for carrying hydraulic fluid into a flow-control channel (9) in order to absorb shock from the door-closing operation, wherein the principal shaft (3) is provided with: a cam (12) for elastically deforming the main springs (16, 17) during the door-opening operation, and receiving the closing force from the main springs (16, 17) during the door-closing operation; and a rack (21) which is provided separately from the cam (12) and serves as a shock-absorbing drive part for moving the shock-absorbing piston (10) according to the opening/closing operation of the door. Specifically, the door closer is preferably a slide-type configured in a manner such that the tip section of an arm for rotating in unison with the principal shaft (3) is guided along a rail and slides. |
