Work holders – With fluid means – Vacuum-type holding means
Patent
1990-10-09
1991-09-17
Watson, Robert C.
Work holders
With fluid means
Vacuum-type holding means
B25B 1100
Patent
active
050488040
ABSTRACT:
A technique of holding an object, wherein an object (10) to be held is placed on a holding surface (3) having a plurality of suction holes (4), each of which has a valve (6) therein which is operated in accordance with the difference between the pressure in the upper or outer space and the pressure in the lower or inner space demarcated by the valve (6). The valve (6) is opened by utilizing the phenomena that such pressure difference in those suction holes (4) closed by the object (10) becomes smaller, whereas the valves (6) are closed by utilizing the phenomena that such pressure difference in those suction holes (4) which are not closed by the object (10) and remain open becomes greater, to thereby prevent reduction of the suction force to be exerted on the object (10).
REFERENCES:
patent: 2680994 (1959-06-01), Wood
patent: 2782574 (1957-02-01), Copold
patent: 2855653 (1958-10-01), Kastenbein
patent: 3307819 (1967-03-01), Cocito
patent: 3460822 (1969-08-01), Link
patent: 3489093 (1969-12-01), Mermelstein
patent: 3907268 (1975-09-01), Hale
FSK Inc.
Watson Robert C.
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