Automatically shifting stair climber structure for a repositiona

Details Automatically shifting stair climber structure for a repositiona Automatically shifting stair climber structure for a repositiona

1989-11-06

1991-08-27

Marmor, Charles A.

Land vehicles

Step or abutment ascending type vehicle

With endless track

280 431, 280 4721, 180 87, B62B 502

Patent

active

050428276

ABSTRACT:
A two-wheeled hand truck has a vertically inclined upright frame with a load supporting nose at its lower end. The frame is supported on a pair of wheels mounted on an axle by brackets which are pivotally connected to the frame for movement from a first load supporting position adjacent the frame to a rearward second position for supporting higher center of gravity loads. A stair climber structure is pivotal on the axle, and a link structure automatically shifts the position of the rear inclined linear surfaces of the stair climber structure to maintain them in a plane extending tangentially to the peripheries of the wheels when the brackets and wheels are moved.

REFERENCES:
patent: 2132069 (1938-10-01), Hall
patent: 2715533 (1955-08-01), Strausburg
patent: 3997182 (1976-12-01), Mortenson
patent: 4130291 (1978-12-01), Saethre et al.
patent: 4762333 (1988-08-01), Mortenson

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