Land vehicles – Wheeled – Extensible
Patent
1991-10-21
1993-03-23
Camby, Richard M.
Land vehicles
Wheeled
Extensible
240 4322, 414476, 414483, B60P 118
Patent
active
051957647
ABSTRACT:
A rectractable trailer having a spring loaded hydraulic piston is provided. The trailer has a bell crank connection for the axles to enable the trailer to be moved between a lowered loading position to an elevated traveling position. The hydraulic piston powers an operating train for raising and lowering the axles. In the operating train the hydraulic piston is pivotally connected to a forward end of a cradle or carriage slidable longitudinally upon a rail-like frame. A rear portion of the cradle is pivotally connected to a telescopic spring loaded operating rod which is pivotally connected at a rear end to an arm of the bell crank axle which is raised and lowered by the hydraulic piston and the operating train. The bell crank axle is comprised of an axle journalled to the trailer bed with the operating arm keyed to the axle at an angle to a wheel supporting arm in such a manner that reciprocation of the piston and the operating train causes angular movement of the bell crank axle to effect the raising and lowering. The operating rod and train effect a linear movement to minimize stress and provide a cushioned support of the bed in raising and lowering and road travel. The operation of the piston may be effected by a remote transmitter from the cab of the vehicle and by a switch on the trailer.
REFERENCES:
patent: 2130980 (1964-04-01), Monroe et al.
patent: 2587624 (1952-03-01), Johnson
patent: 2762631 (1956-09-01), Entz
patent: 2767538 (1956-10-01), Scheidenhelm
patent: 2918298 (1959-12-01), Starr
patent: 2994544 (1961-08-01), Wok
patent: 4043403 (1977-08-01), Anderson et al.
patent: 4058325 (1977-11-01), Schramm
patent: 4943202 (1990-07-01), Galloway
Schantz Michael A.
Schantz Ray G.
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