Vacuum chuck with sealable cavity

Details Vacuum chuck with sealable cavity Vacuum chuck with sealable cavity

1975-01-17

1976-11-30

Whitehead, Harold D.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51277, B24B 1300

Patent

active

039941019

ABSTRACT:
Disclosed is a system for blocking an ophthalmic lens blank by means of a vacuum. The lens blank rests on the chuck and forms an air pocket or cavity therebetween which is evacuated by means of a vacuum pump. After evacuation, an elastic plug is inserted in an aperture in the chuck by atmospheric pressure to maintain the vacuum. The lens is disengaged from the chuck by peeling the plug back and thereby releasing the vacuum.

REFERENCES:
patent: 1456673 (1923-05-01), Dey
patent: 2198765 (1940-04-01), Featherstone et al.
patent: 2688220 (1954-09-01), Boutell
patent: 3020684 (1962-02-01), Oldfield
patent: 3029835 (1962-04-01), Biello et al.
patent: 3095900 (1963-07-01), Newhall

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