Weight lifting safety system employing constant force spring

Details Weight lifting safety system employing constant force spring Weight lifting safety system employing constant force spring

1999-12-23

2000-07-11

Mulcahy, John

Exercise devices

User manipulated force resisting apparatus, component...

Utilizing weight resistance

A63B 21078

Patent

active

060865202

ABSTRACT:
A pair of weight supporting units are provided on opposite sides of a bench. The units are of identical construction and include: a housing; a barbell support shaft and rest extending vertically from the housing; a jack screw interconnected with the shaft; a electric motor for rotating the jack screw; and a constant force spring connected between the top of the housing and a spring platform which is threaded about the jack screw. The motor, spring platform and barbell support are vertically slidable together within the housing. A set of solenoid activated plungers holds them in a retracted position against the force of the spring. In response to a dangerous situation the user depresses an emergency pedal, causing the plungers to release the motor, spring platform and barbell support which is brought to an extended position by the force of the spring. Thereafter, the motor is activated to rotate the jack screw in a first sense causing the motor to travel downwardly to engage the plungers upon which the jack screw is rotated oppositely to bring the spring platform down against the force of the spring.

REFERENCES:
patent: 4799672 (1989-01-01), Barrett
patent: 5281193 (1994-01-01), Colbo, Jr.
patent: 5779602 (1998-07-01), Rodriquez

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