Stair-climbing hand truck

Details Stair-climbing hand truck Stair-climbing hand truck

1983-03-01

1986-02-18

Peters, Jr., Joseph F.

Land vehicles

Step or abutment ascending type vehicle

Jack-type attachment

280 4729, B62B 502

Patent

active

045709530

ABSTRACT:
A hand truck for powered raising and lower of an extremely heavy load comprises first and second frame members constructed of aluminum and mounted for relative longitudinal reciprocating movement. One of the members has a lip attached thereto for positioning the load thereon. The frame members are coupled by means for actuating the relative longitudinal movement. The actuation means is powered by a selectively engageable electric motor. Overload release clutch means is interposed between the motor and the actuation means to decouple the motor and actuation means whenever the load exceeds a predetermined amount.

REFERENCES:
patent: 2412630 (1945-05-01), Nelson
patent: 2608258 (1948-04-01), Jenkins
patent: 2771804 (1955-05-01), Better et al.
patent: 3064990 (1962-11-01), Salvucci
patent: 3515401 (1968-11-01), Gross
patent: 3663033 (1970-11-01), Story
patent: 3907138 (1973-07-01), Rhodes
patent: 3941213 (1974-02-01), Stammen
patent: 3997182 (1976-12-01), Mortenson
patent: 3998476 (1975-09-01), Kazmark
patent: 4284286 (1979-08-01), Lewallen

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