Handling: hand and hoist-line implements – Utilizing fluid pressure – Venturi effect
Patent
1987-08-28
1988-11-29
Marbert, James B.
Handling: hand and hoist-line implements
Utilizing fluid pressure
Venturi effect
294 65, B66C 102
Patent
active
047876620
ABSTRACT:
Apparatus for gripping workpieces using a vacuum includes a plurality of throat bores in a support block, each bore having a constricted portion of its length of a diameter such that the air flow permitted through all of the bores together is less than the pumping capacity of a vacuum pump that draws a vacuum through the bores. In a preferred embodiment, the constricted portions of the bores have a diameter of about 0.008 inches. A rubber pad affixed to the front face of the support block has pad bores therethrough corresponding to the locations of the throat bores, and also has suction cups on the front face of the pad, through which the vacuum is applied, to aid in gripping the workpiece. A vacuum manifold over the back face of the support block draws a vacuum through the bores, thereby gripping the workpiece. The constricted portion of each throat prevents overly rapid drawing of air into the vacuum manifold, so that the tool is effective for picking up workpieces even when a fraction, and indeed nearly all, of the bores are not contacting a solid surface of the workpiece and are drawing air.
REFERENCES:
patent: 1842383 (1932-01-01), Bell
patent: 3556578 (1971-01-01), Meyers
patent: 4352440 (1982-10-01), Fukai et al.
patent: 4452557 (1984-06-01), Bouwknegt et al.
patent: 4479298 (1984-10-01), Hug
patent: 4703966 (1987-11-01), Lewecke et al.
Hewlett--Packard Company
Marbert James B.
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