Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1976-11-15
1977-08-16
Whitehead, Harold D.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
33185R, 51160, B24B 4910
Patent
active
040416496
ABSTRACT:
An alignment device of the type primarily intended for use in combination with an ophthalmic cylinder surfacing machine to insure proper optical axis alignment of the lens blank, to the lap, as it is being ground. The device includes a base member which is fitted into the lap-retaining table of the surfacing machine and a top member which is fitted onto the pins of the pin holder of the machine. An open circuit including an audible or visual signal is mounted within the base member, and electrical contacts for the circuit are disposed on the base's upper surface. Corresponding electrical contacts are disposed on the bottom of the top member so that when the top is placed in contiguous, overlying relationship to the base, if the alignment of the machine is properly adjusted, the electrical circuit will be completed resulting in either an audible or visual signal to the operator that the machine is ready for use.
REFERENCES:
patent: 1518394 (1924-12-01), Dey
patent: 2141309 (1938-12-01), McCabe
patent: 2971263 (1962-02-01), Rockafellow
patent: 3160870 (1964-12-01), Randall
patent: 3499226 (1970-03-01), Hopkins
Practical Systems, Inc.
Whitehead Harold D.
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