Article raising and lowering apparatus

Details Article raising and lowering apparatus Article raising and lowering apparatus

1985-01-25

1986-07-08

Spar, Robert J.

Material or article handling

Vertically swinging load support

Shovel or fork type

414716, 414742, 414917, B66F 916

Patent

active

045990352

ABSTRACT:
A device for raising and lowering a heavy object between selected heights and positions includes two pairs of spaced, parallel lift arms which are pivotally coupled at one end. One end of one of the pairs of lift arms is pivotally coupled to a base member. A shaft extends between the lever arms and a handle is provided to rotate the shaft to simultaneously rotate the lift arms with respect to the base member. Linkages couple the other lift arms to the shaft at pivot points which are offset from the pivot points of the lift arms and from the shaft. Accordingly, the two pairs of lever arms simultaneously move with respect to one another upon the actuation of the connecting shaft.

REFERENCES:
patent: 2500815 (1950-03-01), Gerli et al.
patent: 2573416 (1951-10-01), Eddy
patent: 2792135 (1957-05-01), Wood

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