Chucks or sockets – With fluid-pressure actuator – Socket type
Patent
1983-03-24
1985-04-30
Briggs, William R.
Chucks or sockets
With fluid-pressure actuator
Socket type
91420, 91437, 91464, B23B 3130, F15B 13042
Patent
active
045139792
ABSTRACT:
An improved machine tool has a chuck assembly which is actuated by a piston and cylinder type motor assembly. When a workpiece is to be gripped by the chuck assembly, high pressure fluid is directed to one chamber of the piston and cylinder motor and is exhausted from the opposite chamber. When the chuck assembly has gripped a workpiece, relative movement between the piston and cylinder is interrupted and fluid is no longer discharged from the motor. A pressure responsive switch assembly detects the reduction in the rate of the flow of fluid from the motor to provide a signal to indicate that a workpiece has been firmly gripped by the chuck assembly. After an initial machining operation in which relatively high forces are applied to the workpiece, such as during a rough cutting operation, the chucking forces applied to the workpiece are reduced prior to initiation of a finish cutting operation. This is accomplished by increasing the fluid pressure in the low pressure motor chamber to a pressure which is slightly less than the pressure in the high pressure chamber of the motor. Once this has been done, the pressures in both chambers of the motor are simultaneously reduced at the same rate until the desired pressure is obtained in the high pressure chamber.
REFERENCES:
patent: 3730539 (1973-05-01), Swanson
patent: 3735670 (1973-05-01), Smithson
patent: 3771802 (1973-11-01), Hiramatu et al.
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patent: 3895560 (1975-07-01), Anderson
patent: 3908383 (1975-09-01), Selden
patent: 3986437 (1976-10-01), Lioux
patent: 4221160 (1980-09-01), Selden
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patent: 4281584 (1981-08-01), Onken et al.
patent: 4314502 (1982-02-01), Brinkel et al.
patent: 4414871 (1983-11-01), Trout
Briggs William R.
Eifler Raymond J.
Massung Howard G.
The Warner & Swasey Company
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