| 摘要 |
A garage door operation control apparatus comprises a driving system including an electric motor 16 and chain drive mechanism 3 to operate the door 6 through a trolley 4 and rail 2 connection. A pulley rack 28 on a drive pulley 19 actuates an upper limit switch 30 and a lower limit switch 29 at the door upper and lower limit positions respectively. The interlocked relation of the driving system and the pulley rack 28 may be cancelled thereby to adjust the responsive position of the limit switches. <IMAGE> |
