Patent ID: 8443488

Claim:
A door closer capable of realizing self-control positioning, comprising: an elastic mechanism, wherein said elastic mechanism comprises: a cylindrical housing, a piston component, a long spring, and a pull rod, the piston component is built in the cylindrical housing and connected and fastened with one end of said pull rod, the pull rod is sheathed in the long spring, and two end parts of said long spring respectively are in contact with a sealing lid of said piston component and said cylindrical housing; and a self-control positioning mechanism, said self-control positioning mechanism comprises: a cylindrical outer sleeve, a control part and a locking part, the cylindrical outer sleeve is connected and fastened with the cylindrical housing, the control part is engaged and disengaged with the locking part, and the locking part is engaged and disengaged with the pull rod and clasped when locking, and said pull rod is provided with a series of grooves, wherein any one of the series of grooves is configured to be clasped with the locking part; wherein said pull rod is in a square structure, the other end of the pull rod, which is opposite to the end fastened the piston component, penetrates the cylindrical outer sleeve and extends out of the end part of the cylindrical outer sleeve, wherein the door closer is arranged on a doorframe, and the other end of the poll rod is arranged on a door leaf, wherein the series of grooves is arranged on a top surface of the pull rod, one side wall of each groove is a vertical plane, and the opposite side wall thereof is an inclined plane; wherein, when the door leaf is pushed, the pull rod extends outwards, and when the door leaf needs to be stopped at a certain angle, the control part is pressed down, then the control part drives the locking part to move down, and the locking part is clasped with one of the series of grooves to lock the door leaf at a certain angle; wherein, when the door leaf is pushed in a door opening direction, the locking part separates from the groove of the pull rod, then the pull rod retracts freely, and the door leaf can be closed.