| 摘要 |
The invention provides a door closer. When the expansion absorption member is used, the door opening angle cannot be changed by adopting three-segment opening/closing speed adjusting force. The door closer (1) is provided with a control mechanism part (17), which can be used to adjust the moving speed of a piston (4) by adjusting the moving oil mass of the working oil between a first oil chamber (3a) and a second oil chamber (3b) and can carry out the reciprocating motion of the piston (4), and therefore the door opening speed can be controlled. The piston (4) is connected with a hollow member (8) in a spring (5). The hollow member (8) is provided with a hollow part (8a) communicated with the first oil chamber (3a) and the second oil chamber (3b), a check valve (8A) capable of preventing the working oil flowing from the first oil chamber (3a) to the hollow part (8a), and a foamed rubber (10) accommodated in the hollow part (8a). |
