Land vehicles – Wheeled – Tiltable vehicles – stabilized by attendant or article
Patent
1997-10-31
2000-03-21
DePumpo, Daniel G.
Land vehicles
Wheeled
Tiltable vehicles, stabilized by attendant or article
280 4711, 280 4727, B62B 112
Patent
active
060393327
ABSTRACT:
A steerable hand truck having improved maneuverability. In a first embodiment of the invention, the steerable hand truck includes a sheathed steering cable which connects at a first end to a pair of pivotal handles and at a second end to a pair of pivotal axle spindles. In a second embodiment, the steering mechanism of the hand truck comprises a series of pivotally connected rigid links. A first link in the series is pivotally connected to the handles and a last link in the series is connected to the axle spindles. Pivotal movement of the handles is transmitted to the axle spindles through the links. In a third embodiment, the steering mechanism comprises an electric motor which is actuated by a control switch mounted to the truck. The motor is used to drive the axle spindles either to the right or left depending upon the direction selected with the control switch. In each embodiment, the load platform of the truck is provided with a pivot point about which the truck can be pivoted when in the upright position to allow the operator to more easily turn the truck in limited spaces.
REFERENCES:
patent: 2235041 (1941-03-01), Ronning
patent: 2235042 (1941-03-01), Ronning
patent: 2235043 (1941-03-01), Ronning
patent: 2235044 (1941-03-01), Ronning
patent: 2711330 (1955-06-01), Frye
patent: 3166339 (1965-01-01), Earley
patent: 3507511 (1970-04-01), Seidel
patent: 4203609 (1980-05-01), Mitchelle t al.
patent: 4796909 (1989-01-01), Kirkendall
DePumpo Daniel G.
Kayden James W.
Vanaman Frank
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