Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1991-12-13
1993-03-09
Huppert, Michael S.
Material or article handling
Vertically swinging load support
Shovel or fork type
2940203, 2940208, 212196, 254123, 198509, B66C 320
Patent
active
051921804
ABSTRACT:
An apparatus including a frame, a cantilever arm movably mounted on the frame, and a servomotor operatively connected to the frame and the cantilever arm for setting a height position of the cantilever arm. The servomotor is exposed to tension loads derived from forces acting on the cantilever arm. The apparatus further includes a device for relieving the servomotor of the tension loads for an arbitrary period. The device includes a tension member attached parallel to the servomotor for the arbitrary period. The device further has an intermediate member having a first pivot joint operatively articulated to the cantilever arm for introducing the tension loads into the intermediate member, a second pivot joint for being coupled to an end of the tension member and a third pivot joint for being releasably coupled to the servomotor. The first, second and third pivot joints are spaced from one another and form the three corners of an imaginary triangle.
REFERENCES:
patent: 3635486 (1972-04-01), McLean et al.
patent: 3931956 (1976-01-01), Hawkins
patent: 4004696 (1977-01-01), Briggs
Huppert Michael S.
Krupp Industrietechnik Gesellschaft mit beschrankter Haftung
Underwood Donald W.
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