초록 ▼

A mechanism which normally is driven by a motor, but which can be safely manually driven by a hand crank or the like in case of a power shortage or other emergency. The mechanism has a power-driven drive gear and a driven assembly which preferably includes a gear-like member, such as a worm, and a c

A mechanism which normally is driven by a motor, but which can be safely manually driven by a hand crank or the like in case of a power shortage or other emergency. The mechanism has a power-driven drive gear and a driven assembly which preferably includes a gear-like member, such as a worm, and a crank-receiving member, such as an internally splined hub. A disconnecting assembly which is responsive to engagement of the hand crank in the crank-receiving member is provided to disconnect the driven assembly from the power-driven drive gear.

대표청구항 ▼

A mechanism with manual override, comprising: power-driven drive gear means; driven means including a worm operatively driven by said power-driven drive gear means about an axis of rotation, said worm defining an internal disconnecting means-receiving chamber, and an output lever partly defining a w

A mechanism with manual override, comprising: power-driven drive gear means; driven means including a worm operatively driven by said power-driven drive gear means about an axis of rotation, said worm defining an internal disconnecting means-receiving chamber, and an output lever partly defining a worm gear spaced from said axis of rotation and driven by said worm; a hub defining a crank-receiving socket coaxially aligned with said internal disconnecting means-receiving chamber along said axis of rotation; manual drive means including a hand crank engageable in said socket for manually driving said driven means; and disconnecting means at least partly positioned in said internal disconnecting means-receiving chamber and responsive to engagement of said manual drive means with said driven means for disconnecting said driven means from said power-driven drive gear means.