Chucks or sockets – With fluid-pressure actuator – Socket type
Patent
1975-01-09
1976-08-03
Simpson, Othell M.
Chucks or sockets
With fluid-pressure actuator
Socket type
91420, B23B 3112
Patent
active
039725375
ABSTRACT:
An improved chuck actuator assembly includes a fluid motor which is utilized to open and close a chuck. The actuator motor is effective to apply forces to the chuck to hold it closed during rotation of a workpiece. In the event of an accidental loss of fluid pressure to the actuator motor, a check valve is closed to prevent the exhausting of large quantities of fluid from the motor. However, as the check valve closes, a small quantity of fluid is discharged from the actuator motor. The loss of even a small quantity of fluid could tend to cause the chuck to relax its grip on the workpiece. To prevent this from happening, a compensator assembly is provided to maintain the fluid pressure in the actuator motor chamber substantially constant by making up for the small quantity of fluid which is lost upon closing of the check valve. The compensator assembly includes a piston which is moved under the influence of a biasing spring. This movement of the piston discharges fluid from an auxiliary chamber into the motor chamber to thereby makeup for the fluid which is lost during the closing of the check valve. The spring pressure bias against the piston is effective to maintain the fluid pressure in the motor chamber substantially constant so that the forces urging the chuck closed remain substantially constant. The compensator assembly is advantageously mounted on the main piston in the actuator motor and is rotated with the actuator motor during operation of the machine tool.
REFERENCES:
patent: 3641875 (1972-02-01), Kodalle
patent: 3892165 (1975-07-01), Lioux
Bilinsky Z. R.
Simpson Othell M.
The Warner & Swasey Company
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