Earth working – With ground support vertically adjustable relative to frame – Translating motion
Patent
1975-10-17
1978-03-28
Hoffman, Drayton E.
Earth working
With ground support vertically adjustable relative to frame
Translating motion
172805, E02F 372
Patent
active
040810925
ABSTRACT:
A tractor is provided on either side with elongated lifting beams pivotally joined rearwardly to the tractor frame and including at least one cross member joining the beams forwardly of the tractor and to which a bulldozer blade or other implement may be attached. A pivot member is attached pivotally to the tractor frame generally beneath and intermediate the length of the beam. A frame-mounted hydraulic jack is coupled to the pivot member at a point spaced from the mount of the latter to the frame and is oriented to urge the pivot member to pivot upwardly and forwardly. A beam strut, pivotally connected at one end to the beam and at the other end to the pivot member at a point spaced from the mounting of the latter to the frame, is oriented to form a generally forwardly open angle with a line passing between its attachment to the pivot member and the mount of the pivot member to the tractor frame. The moment arm extending between the mount of the pivot member to the frame and the attachment to the hydraulic cylinder is longer than the moment arm passing between the pivotal attachments of the pivot member to the frame and to the beam strut, whereby significant mechanical advantage is obtained in raising the lifting beams. Also disclosed is a bulldozer blade having rearwardly extending, vertically spaced mounting plates which are mounted by means of at least one vertical pin to vertically spaced brackets forming part of the front structure of the lifting arms and cross member. Further disclosed is a forwardly open bucket having side and bottom walls abutting the forward surface of the bulldozer blade and pivotally attached to the blade to permit the bucket to move in an upward, forward arc to discharge its contents.
REFERENCES:
patent: 2488695 (1949-11-01), Upton
patent: 2565337 (1951-08-01), Allan
patent: 2629946 (1953-03-01), Ewers et al.
patent: 2904910 (1959-09-01), Armington
patent: 3209474 (1965-10-01), Artman
patent: 3773116 (1973-11-01), Coontz
patent: 3870171 (1975-03-01), Zimmerman
Hoffman Drayton E.
Palmatier H. Dale
Weaver Ross
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