Land vehicles – Wheeled – Extensible
Patent
1976-01-29
1977-02-22
Song, Robert R.
Land vehicles
Wheeled
Extensible
280 4324, 280490R, B62D 3308
Patent
active
040089029
ABSTRACT:
A tractor towed stock trailer having a stock carrying platform which may be lowered directly onto the ground for loading and unloading stock and raised to a stock carrying position for transport. A pair of upstanding side plates are pivotally supported at opposite sides of the platform, each having a wheel carried on a lower end thereof, and pivotable as a unit structure about a common transverse axis secured to the side plates adjacent the upper ends thereof. Each side plate is of a triangular shape and, when the platform is in a lowered position therefor, has the apex portion between the upper and lower ends thereof in ground engagement. A linearly extendible and retractable power unit is connected to the platform and to each pivoted side plate such that upon initial extension of the power unit to raise the platform from its lowered position on the ground, an efficient lifting leverage is obtained by the initial fulcrum action of the ground engaged apex portion followed by the fulcrum action of the ground wheels.
REFERENCES:
patent: 3062558 (1962-11-01), Krolicki
patent: 3536339 (1970-10-01), Fichtenberg
patent: 3635492 (1972-01-01), Mauldin
patent: 3711110 (1973-01-01), Logerquist
patent: 3876222 (1975-04-01), Thorsell
Fairfield Engineering and Manufacturing Company
Lowell Rudolph L.
Song Robert R.
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