Hand truck under-carriage for engaging stairs or the like

Details Hand truck under-carriage for engaging stairs or the like Hand truck under-carriage for engaging stairs or the like

1989-02-06

1990-10-16

Marmor, Charles A.

Land vehicles

Step or abutment ascending type vehicle

With endless track

180 91, 305 17, B62B 502

Patent

active

049629409

ABSTRACT:
A pair of endless belt track assemblies attach to the frame of a hand truck and extend backwards from the ground wheels for a distance to facilitate travel on stairs or the like during the intervals when the ground wheels are out of contact with the stair treads. Rollers are situated between the front, back, lower and upper regions of a pair of spaced apart side plates and are spaced from the edges of the plates to define a continuous belt guideway between the peripheral regions of the side plates. An endless belt is seated in the guideway in continuous contact with each of the rollers and functions as a crawler track when the truck wheels are out of contact with the stairs. The construction reduces resistance to belt movement from friction and inhibits jamming of the rollers and snagging of the belt.

REFERENCES:
patent: 1583114 (1926-05-01), Bierly
patent: 1960234 (1934-05-01), Eckels
patent: 2193283 (1940-03-01), Harberson
patent: 2260027 (1941-10-01), Hotson
patent: 2301341 (1942-11-01), Stevens et al.
patent: 2620041 (1952-12-01), Chenette et al.
patent: 2775463 (1956-12-01), Chenette
patent: 2820643 (1958-01-01), Cohn
patent: 4136888 (1979-01-01), Bowie, Jr. et al.
patent: 4290618 (1981-09-01), Morton
patent: 4531752 (1985-07-01), Diener

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