Spring assist system for gravity deployment of stowed platform w

Details Spring assist system for gravity deployment of stowed platform w Spring assist system for gravity deployment of stowed platform w

1997-04-16

1998-09-15

Noland, Kenneth

Elevator, industrial lift truck, or stationary lift for vehicle

Stairway assist for individual or minor barrier lift for...

414921, B66B 908

Patent

active

058066322

ABSTRACT:
A wheelchair platform free fall control system comprising use of a tension means, such as at least one spring, biasing together the long and short arms of a lever arm assembly that keeps the lever arm slide block in contact with a lifting arm during gravity-down deployment of said platform from an over-vertical stowed position to a horizontal transfer position. A compression means may be used in conjunction with the lifting arm assembly to assist in overcoming the resting momentum of the lift platform mass from over-vertical outwardly until gravity takes over. The tension means may be one or more springs and the compression means may be a gas spring. The forces are preselected to provide lifting assembly over-vertical assist while keeping the sliding block in substantial contact with an arm of the lifting assembly. The springs can be used with a stud/slot interlock. Torsion springs are preferably eliminated.

REFERENCES:
patent: 5261779 (1993-11-01), Goodrich

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