Internal hydraulic clamp

Details Internal hydraulic clamp Internal hydraulic clamp

1984-01-16

1986-01-21

Bilinsky, Z. R.

Gear cutting, milling, or planing

Milling

Work support

279 2R, 409903, B23Q 306

Patent

active

045654760

ABSTRACT:
A device for securing a workpiece to a fixture for performing machining operations includes a tubular, radially expansible mandrel. The mandrel is carried in a passage provided in the fixture and extends into a hole provided in the workpiece. An expander stem is carried within a bore of the mandrel. The stem has an upper end that is tapered for expanding the mandrel. The lower end of the stem is connected to a hydraulic piston. A spring applies an upward force on the mandrel. A hydraulic cylinder moves the stem downwardly, while the spring retains the mandrel in a stationary position until it grips the workpiece. Then, the hydraulic force overcomes the force of the spring to pull the mandrel downward slightly to secure the workpiece to the fixture.

REFERENCES:
patent: 1566370 (1925-12-01), Briscoe
patent: 2970842 (1961-02-01), Drew
patent: 2996301 (1961-07-01), Cox
patent: 3026115 (1962-03-01), Brauer, Jr. et al.
patent: 3050313 (1962-09-01), Lengyel
patent: 3517939 (1970-06-01), Jaehn
patent: 3565416 (1971-02-01), Williamson et al.
patent: 3633929 (1972-01-01), Morawski et al.
patent: 3871670 (1975-03-01), Wright

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