Stone working – Splitting – shearing – and punching
Patent
1980-08-29
1982-08-10
Whitehead, Harold D.
Stone working
Splitting, shearing, and punching
225103, B28D 132
Patent
active
043432875
ABSTRACT:
A machine is disclosed for cleaving hard crystals (40), a typical example of which is lithium fluoride, with precision and uniformity and includes vertical axis positioning control means (12) for an adjustable spring tension guided hammer mechanism (17, 18) employed to strike an anvil (21) and thereby generate a crystal cleaving shock wave transmitted to a cleaving blade (23) having an angulated cleaving edge 24 in contact with one corner of the crystal (40). Connection between the anvil 21 and the blade is by means of a pair of vertical shafts (20) held in substantially friction free engagement by two pairs of adjustable linear bearings (19). An underlying crystal holding fixture (38) with horizontal position control means (14) includes a zero reference stop face (42) for the crystal (40) and opposing spring-loaded clamping and vertical positioning elements (43, 44) which are precisely guided. The crystal (40) is restrained only to the extent that it remains in an ideal position for cleaving until the shock wave begins to propagate along a cleavage plane. Thus the shock wave forces that separate the crystal are balanced and the light restraining force used to hold the crystal allows it to splay apart with minimal shock wave damping.
REFERENCES:
patent: 304858 (1884-09-01), Reichardt
patent: 1084827 (1914-01-01), Sudre
patent: 1094177 (1914-04-01), Sudre
patent: 1353367 (1920-09-01), Whipple
patent: 2582694 (1952-01-01), Gundlach
patent: 3187739 (1985-06-01), Du Fresne
patent: 3901423 (1975-08-01), Hillberry
patent: 4184472 (1980-01-01), Benedicto
Benedicto John S. J.
Hallberg Frederick C.
Manning John R.
Sandler Ronald F.
The United States of America as represented by the Administrator
Tresansky John O.
Whitehead Harold D.
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