Material or article handling – Vertically swinging load support – Grab
Patent
1992-02-26
1993-05-04
Huppert, Michael S.
Material or article handling
Vertically swinging load support
Grab
294 65, 414752, 901 40, B25J 1506
Patent
active
052075532
ABSTRACT:
A suction lifting head for use in the lifting and transport of generally flat workpieces is designed to conform to its use with workpieces varying in size and produce activation of such suction ports therein as necessary to perform the lifting of the workpiece. The lifting head is constructed with a body having an outer suction port(s) at a surface of the body, a valve chamber(s) connected to the outer suction port and intervening an inner suction port which in turn is in communication with a vacuum main connection at a side of the body remote from the surface having the outer suction port(s). A valve disk with multiple holes for air flow is located inside the valve chamber. These holes are located in the valve disk to be positioned radially beyond the circumference of the outer suction port and such that circumferential portions of the valve disk will be supported on a stepped section in the valve chamber when a workpiece is lifted against the outer suction port. In such condition, holding influence of the vacuum is sustained because a communication path from the outer suction port to the inner suction port includes the holes in the valve disk which have at least portions extending radially inwardly of the valve chamber stepped section support structure.
REFERENCES:
patent: 2960364 (1960-11-01), Herzog
patent: 4674785 (1987-06-01), Riesenberg
Huppert Michael S.
Underwood Donald W.
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