Land vehicles – Wheeled – Tiltable vehicles – stabilized by attendant or article
Patent
1993-08-17
1995-08-29
Johnson, Brian L.
Land vehicles
Wheeled
Tiltable vehicles, stabilized by attendant or article
280 472, 280641, B62B 112
Patent
active
054453992
ABSTRACT:
A positive locking arrangement for a retractable leg of a collapsible hand truck. A slide connected to the hand truck front axle is retained within a slot formed in a tab connected to the retractable leg. The slide includes a projection interlocking the tab thereto. To disengage the locked members, the retractable leg must be swung backwardly in a first motion, thus aligning the slot with the projection. In a second motion, the slide is then raised, the projection just passing through the slot, and the slide continues to feed through the tab, coming to a final vertical position parallel to and against the hand truck body. The slide terminates at an angle, thus cooperating with the tab so as to be urged by gravity to a lowermost position, thus favoring engagement. The tab is inclined to extend upwardly from its anchoring point, thus limiting downward movement of the slide. A removable pin or hook is inserted into the slot when it is desired to secure the slide in the deployed, locked condition. A chain of excessive length tethers the pin to the hand truck.
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Johnson Brian L.
Litman Richard C.
Yu Min S.
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