Selectively-retractable elevated walkway extension

Details Selectively-retractable elevated walkway extension Selectively-retractable elevated walkway extension

1988-01-11

1988-11-29

Novosad, Stephen J.

Bridges

Gangway, ramp, or dock leveler

Attached

414921, 182113, 182148, 49116, 49369, E01D 100

Patent

active

047871113

ABSTRACT:
A selectively positionable extension for an elevated walkway includes a planar ramp mounted by rollers to a frame and coupled to the frame by a selectively extensible hydraulic ram. The frame itself is supported by a second ramp for controlled vertical positioning. A pair of handrail gates are pivotally mounted on the ramp frame at opposed lateral sides thereof, and engage guide channels in the ramp side edges for automatically opening and closing the handrail gates as the ramp is extended from and retracted into the frame. The guide channels are so constructed that the handrail gates open and close from overlapping positions without interference. The entire extension is provided as a modular assembly which may be readily incorporated into existing or new walkway constructions.

REFERENCES:
patent: 4106150 (1978-09-01), Irwin
patent: 4171550 (1979-10-01), Phaup
patent: 4222140 (1980-09-01), Olewinski et al.
patent: 4280243 (1981-07-01), Durrant
patent: 4403362 (1983-09-01), Durrant
patent: 4482284 (1984-11-01), Robbins et al.
patent: 4572328 (1986-02-01), Benko

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