Extendable ramp for boats and vehicles

Details Extendable ramp for boats and vehicles Extendable ramp for boats and vehicles

2007-06-12

2007-06-12

Hartmann, Gary S. (Department: 3671)

Bridges

Gangway, ramp, or dock leveler

Attached

C014S069500, C414S921000

Reexamination Certificate

active

11156217

ABSTRACT:
An extendable ramp apparatus is provided for automatically extending a ramp. The apparatus comprises a generally rectangular frame with a track for movement of a carriage pivotally connected to a ramp along the track. The ramp pivots downwardly as it is extends from the frame until it encounters a surface. A bidirectional motor is provided with a cabling arrangement to reciprocate the carriage and ramp along the track. Shock absorbers may slow the carriage movement as the ramp is extended so that hard contact of the ramp with a surface is minimized. An innovative capstan arrangement provides more rapid movement of the ramp as it retracts but provides more power during ramp extension, so that vertical movement of the ramp is slowed as the ramp is extended. The apparatus may find application in vehicles such as trucks, vans, and boats whenever it is desired to move goods or people between surfaces of different heights, such as a truck bed and the ground.

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