Prosthetic load-lift hook locking mechanism

Details Prosthetic load-lift hook locking mechanism Prosthetic load-lift hook locking mechanism

1976-09-16

1978-02-21

Frinks, Ronald L.

3 123, A61F 100, A61F 106

Patent

active

040743675

ABSTRACT:
An electrically controlled pawl and ratchet mechanism on a prosthetic device to increase the lifting ability of the system throughout the excursion range thereof and without opening the system's terminal device. A ratchet wheel is positively connected to and driven by the forearm pulley assembly of the prosthetic system and an electrically controlled pawl is used therewith to provide uni-directional braking action, which inhibits opening of the associated terminal device. The device is self-locking on engagement of the pawl with the ratchet wheel under torque application conditions. Reduction of the applied torque to zero subsequently causes disengagement of the pawl, and the terminal device may then be freely used. The pawl is controlled by a solenoid which is energized for a timed period by a timer operated responsive to command energization of the system motor.

REFERENCES:
patent: 2580987 (1952-01-01), Alderson
patent: 3866246 (1975-02-01), Seamone et al.

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