Lifting apparatus

Details Lifting apparatus Lifting apparatus

1988-05-27

1990-04-03

Simone, Timothy F.

Agitating

Having interrelated feed and discharge means

Including means to monitor or control operation

366 53, 366 65, 366 95, 366153, 366237, 366606, B01F 1502

Patent

active

049135546

ABSTRACT:
A lifting apparatus includes a load support device for engaging and supporting a load as the load support device and the load are moved between a lowered position and a raised position relative to a base. A pair of spaced lifting arms are connected at first pivotal connections to the base and at second pivotal connections to the load support device for moving the load support device between its lowered and raised positions. A stabilizer arm is connected at a third pivotal connection to the load support device, and at a fourth pivotal connection to the base, for controlling a rotational orientation of the load support device about an axis of the second pivotal connection relative to the base. A sprocket is rigidly attached to each of the lifting arms substantially coaxial with the first pivotal connection, and a chain is operably engaged with each sprocket. A power drive, preferably a hydraulic ram, is mounted on the base and operably connected to each chain for moving the chains to rotate the sprockets and the lifting arms to thereby move the load support device between its lowered and raised positions.

REFERENCES:
patent: 2520033 (1950-08-01), Fuelling
patent: 2547500 (1951-04-01), Selby
patent: 2547787 (1951-04-01), Siebring et al.
patent: 2945684 (1960-07-01), Soldini
patent: 4268174 (1981-05-01), Falardeau
patent: 4490047 (1984-12-01), Stegemoeller et al.
patent: 4538916 (1985-09-01), Zimmerman
patent: 4802141 (1989-01-01), Stegemoeller et al.
Exhibit A--Waltco 1090 Series Hydraulic Tailgate Lift brochure, date unknown.
Exhibit B--Unnamed brochure, date unknown.
Exhibit C--"Champ Tow-A-Lift" brochure of Champ Corporation of El Monte, California, date unknown.

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