Implements or apparatus for applying pushing or pulling force – Hoisting truck – Platform type
Patent
1980-09-05
1981-11-17
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Hoisting truck
Platform type
414 11, B60P 100
Patent
active
043007511
ABSTRACT:
A lower horizontally elongated base frame is provided and includes depending support wheels. An upright longitudinally extendable boom has its lower end pivotally supported from one end of the base frame centrally intermediate the opposite sides thereof for adjusted angular displacement of the boom relative to the frame about a first horizontal transverse axis extending transversely of the frame and the boom between an upright position and a lower horizontal position closely overlying the frame and with the free end of the boom projecting toward the second end of the frame. A second upper horizontal frame is provided and is pivotally supported from the upper end of the boom for adjusted angular displacement of the second frame relative to the boom about a second horizontal axis generally paralleling the first axis between a first position with the second frame disposed at generally right angles relative to the boom and a second position with the second frame generally paralleling the boom. The second frame includes horizontally aligned, upwardly facing and horizontally spaced apart support portions spring mounted therefrom. The boom comprises an extendible fluid cylinder including one end portion supported from the lower frame and a second upper end portion from which the upper frame is supported. A hydraulic pump is supported from the lower frame and is operatively connected to the boom for selective extension and retraction thereof.
REFERENCES:
patent: 1093405 (1914-04-01), Hallen
patent: 2165095 (1939-07-01), Frechette
patent: 2976033 (1961-03-01), Martin
patent: 3049243 (1962-08-01), Buice
patent: 3087630 (1963-04-01), Karnow et al.
patent: 3221900 (1965-12-01), Love
patent: 3365080 (1968-01-01), Crull
patent: 3394933 (1968-07-01), Benoit
patent: 4120484 (1978-10-01), Zimmer
patent: 4186905 (1980-02-01), Brudy
Jacobson Harvey B.
Watson Robert C.
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