Land vehicles – Step or abutment ascending type vehicle – With spider-type engaging means
Patent
1992-06-16
1994-01-11
Johnson, Brian L.
Land vehicles
Step or abutment ascending type vehicle
With spider-type engaging means
280 4727, 188 30, 188 31, 14 695, B62B 502, B62B 504, B62B 110
Patent
active
052774368
ABSTRACT:
In combination, a hand truck having a unidirectional wheel control ratchet and an adjustable length stair ramp are operable for transporting heavy loads of cargo up flights of stairs. A ratchet wheel and pawl assembly is attached to the wheels of the hand truck to limit the direction of rotation of the wheels to a backward rotation. The stair ramp includes two telescoping U-shaped ramp channels which are spaced so that the wheels of the hand truck can roll within the channels and the ramp further includes upper and lower footing cross members which are pivotally connected to the upper and lower ends of the ramp channels. When the ramp is in place on a flight of stairs the telescoping and pivoting qualities of the ramp allow the channels to rest on the apices of the stair steps. The wheel control ratchets permit a heavily loaded hand truck to be pulled up the stairs along the ramp channels without fear of the hand truck rolling forward and down the ramp.
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Frank John H.
Rocha Victor
Johnson Brian L.
Magline Inc.
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