Spring-lock type clamp device

Details Spring-lock type clamp device Spring-lock type clamp device

2007-02-13

2007-02-13

Wilson, Lee D. (Department: 3723)

Work holders

With fluid means

Cylinder-piston means in series with additional positioning...

C269S228000

Reexamination Certificate

active

10542370

ABSTRACT:
Into a housing (3) is hermetically inserted an annular piston (5), and into the annular piston (5) is hermetically inserted an output rod (8). A spring (14) located below the piston (5) moves the piston (5) upward for locking, pressurized oil in a release chamber (12) formed above the piston (5) moves the piston (5) downward for releasing. On an upper surface of the piston (5) is provided a pressing surface (38), on an inner periphery of a peripheral wall of the release chamber (12) is provided a first tapered surface (41), which narrows upward, and on an outer periphery of the output rod (8) is provided a second tapered surface (52), which narrows downward. Between the pressing surface (38), the first tapered surface (41) and the second tapered surface (52) are inserted a plurality of balls (55) circumferentially at intervals. Thereby, when the spring (14) moves the piston (5) upward for locking, a moving stroke of the output rod (8) is larger than that of the piston (5).

REFERENCES:
patent: 5876025 (1999-03-01), Yonezawa
patent: 5927700 (1999-07-01), Yonezawa
patent: 6073325 (2000-06-01), Stark
patent: 6736384 (2004-05-01), Yokota
patent: 2003/0015832 (2003-01-01), Kohlert
patent: 11-170133 (1999-06-01), None

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