Metal tools and implements – making – Saw-making or furbishing device or machine
Patent
1981-03-31
1983-11-22
Schmidt, Frederick R.
Metal tools and implements, making
Saw-making or furbishing device or machine
76 37, 76 33, 76 43, B23D 6316
Patent
active
044161697
ABSTRACT:
An automatic saw chain grinder includes a saw chain support mounted for reciprocative movement on a support carriage. A spring urges the carriage in one direction to move a cutter tooth of a supported saw chain into a grinding wheel against the residual pressure of fluid in a first single-acting hydraulic cylinder. Pressurization of the cylinder moves the carriage in the opposite direction away from the grinding wheel. The grinding wheel is spring-biased toward an active, grinding position and moved away from such position by a second single-acting hydraulic cylinder. The first and second cylinders are sized and the respective springs of the carriage and grinder selected such that upon pressurization of the common hydraulic circuit for such cylinders, the carriage retracts the cutter tooth away from the grinding wheel before the grinding wheel retracts from the grinding position. Conversely, upon depressurization of the circuit, the grinding wheel moves into its grinding position before the carriage moves the cutter tooth into the grinding wheel. Indexing means including a chain wheel power-operated by a reciprocating rod shifts the saw chain along its support to move each successive cutter tooth to be sharpened against a chain stop adjacent the grinding position when a tooth has been sharpened. Power-operated sequencing means including cam-operated levers control reciprocation of the rod and pressurization of the hydraulic circuit to index the chain, move the grinder, and shift the carriage in proper sequence for fully automatic operation.
REFERENCES:
patent: 2570118 (1951-10-01), Hamberger
patent: 3313185 (1967-04-01), Drake et al.
patent: 3349645 (1967-10-01), Silvey
patent: 3952615 (1976-04-01), Benson
patent: 4102223 (1978-07-01), Robinson et al.
patent: 4111075 (1978-09-01), Varley
Meislin Debra S.
Schmidt Frederick R.
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