Patent ID: 8402606

Claim:
A door closer for a top hung sliding door comprising: a buffer mechanism, adapted to be mounted in a sliding track, including a stationary base having a front portion being a guide rail having a locking hole; and a rear portion being a mounting seat; a sliding block slidably mounted on the stationary base and having a guide channel for receiving the guide rail of the stationary base; and an inserting recess having an open bottom; a hook pivotally mounted on the sliding block and having two side surfaces; a hooked portion; and two locking protrusions respectively protruding from the side surfaces of the hook adjacent to the hooked portion and being able to engage the locking hole of the stationary base; two buffers mounted on the mounting seat of the stationary base and each buffer having a cylinder barrel secured in the mounting seat of the stationary base; and a piston rod retractably mounted and held in the cylinder barrel and having a free end inserted into the inserting recess of the sliding block, an insert unit securely inserted into the inserting recess of the sliding block from the open bottom of the inserting recess and having a locking slot engaging the free ends of the piston rods to secure the piston rods to the sliding block; and two resilient members mounted on the mounting seat of the stationary base and each resilient member having two ends, one end of each resilient member secured to the stationary base and the other end of each resilient member secured to the sliding block; and a trolley hanger, adapted to be mounted on a door panel, including a sliding base; and a trolley detachably mounted to the sliding base and having a roller seat having a top surface; two side surfaces; and at least one engaging recess formed in the top surface of the roller seat and selectively engaging the hooked portion of the hook; and multiple rollers, adapted to run in the track, rotatably mounted on the side surfaces of the roller seat.