Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1991-08-28
1993-03-23
Huppert, Michael S.
Material or article handling
Vertically swinging load support
Shovel or fork type
414719, 60413, 60469, B66C 2356
Patent
active
051958643
ABSTRACT:
A hydraulic system for a wheel loader having an implement arranged for elevational and tilting movements relative to a frame of the loader. The hydraulic system includes selectively operable lifting and tilting circuitry for adjusting the position of the implement and a shock absorbing mechanism arranged in combination with the lift circuitry for allowing relative movement between the implement and the frame to provide a cushioning effect which reduces pitching of the loader. To inhibit inadvertent vertical displacement of the implement, the shock absorbing mechanism is responsive to an initial lifting action of the implement. In a preferred form of the invention, the shock absorbing mechanism is responsive to hydraulic conditions indicative of imminent tilting movement of the implement thereby eliminating inadvertent vertical displacement of the implement when the implement reaches a limit of its tilting travel.
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J. I. Case Model No. 721 Wheel Loader brochure, undated.
Zettelmeyer Baumaschinen GmbH brochure, (one page) illustrating a load stabilizing system for a front end loader, undated.
Caterpillar brochure, (one page) illustrating a ride control system for a wheel loader.
Triad Equipment Corporation brochure, (2 pages) entitled "Improve Your Cycle Time With Bucket Suspension Control for Case Wheel Loaders".
Hanomag Baumschienen brochure, (6 pages) of a Systeme ALS" (no translation available).
Kolebeco brochure, (14 pages), undated.
Drake Frank J.
Jaecks Bruce K.
Case Corporation
Hienz William M.
Huppert Michael S.
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