Personal lift device
A personal lift device is disclosed having a motor having an output shaft. A gearing system is operatively connected to the output shaft for increasing torque. A strap for suspending a weight is wound onto a spool and rotating the spool extends and retracts the strap. A drive connection is made between the gearing system and the spool to permit said motor to drive said spool. A brake is associated with said spool to prevent unwanted extension of said strap from said spool, when a weight is suspended by said strap. In a preferred embodiment a clutch is provided between the brake and the drive train, and the greater the weight supported by the spool the greater the braking force. An emergency lift and lower device is also provided in the event of a failure of the motor.
1. A personal lift device comprising:
a manually actuatable elongate element;
a manually rotatable output shaft operatively connected to said elongate element;
a gearing system operatively connected to said output shaft,
the gearing system being efficient so as to be non-self-braking;
a strap for suspending a weight;
a spool for suspending said strap and for extending and retracting said strap;
a drive connection between said gearing system and said spool to permit said output shaft to drive said spool; and
a brake, associated with said spool to prevent unwanted extension of said strap from said spool, when a force is applied to said strap.
2. An emergency lift and lower assembly for a personal lift device comprising:
a cover for protecting a drive train of said personal lift device;
a take off member extending from said cover and accessible from outside of said cover, said take off member operably connected to a drive train of said personal lift device;
a manually actuatable element, releasably connected to said take off member, to remotely drive said take off member when said element is connected and to permit said element to be stored out of the way when said element is disconnected; and
a coupler to releasably connect said take off member with said drive train, such that said take off member is disengaged from said drive train during normal operation of the personal lift device.
3. The personal lift device of claim 2 wherein said coupler is adapted to connect said manual take off member with said manually actuatable element by activation of said manually actuatable element.