Patent ID: 7261139

Claim:
In an upward acting door including a motor drive unit operably connected to said door for moving said door between open and closed positions, a drive shaft associated with said motor drive unit including a drive tang connected thereto, a manual crank member including a part adapted to be releasably connected to said drive tang for manually rotating said drive shaft, a control unit operably connected to said motor drive unit for supplying electrical power thereto, a support for said manual crank member, switching means mounted in a position in relation to said support such that when said manual crank member is disposed on said support said switch means is operably engaged with said manual crank member in a first condition and when said manual crank member is removed from said support said switch means is in a second condition, said switch means being operably connected to said control unit in a way such that in said second condition of said switch means said control unit is operable to prevent energizing said motor.