Patent ID: 6840010

Claim:
A trolley member for a garage door opener, comprising a trolley body ( 2 ), a connecting rod ( 7 ) connected to the trolley body, the trolley member further comprising a gear shaft ( 3 ) disposed on the trolley body ( 2 ) and rotatably connected to the trolley body ( 2 ), a rack ( 5 ) disposed on the trolley body ( 2 ) and rotatably connected to the trolley body ( 2 ), a gear ( 9 ) disposed on the gear shaft ( 3 ), teeth of the gear ( 9 ) engaged with teeth of the rack ( 5 ), the rack ( 5 ) connected to the a spring device, the rack ( 5 ) having two working status wherein a first working status is that the rack ( 5 ) is inserted into a slot ( 10 ) of a chain link ( 8 ) and the spring member urging the rack ( 5 ) to the first working status, and a second working status is that the rack ( 5 ) is detached from the slot ( 10 ).