Rotary clamping apparatus

Details Rotary clamping apparatus Rotary clamping apparatus

1997-10-31

2000-09-05

Smith, James G.

Work holders

With fluid means

Plural positioning means sequentially operated

269 32, 269 27, B23Q 308

Patent

active

061130869

ABSTRACT:
An annular piston (4) is inserted into a housing (1) axially movably but unrotatably. A clamp rod (9) is hermetically inserted into a through-hole (4a) of the piston (4). When the piston (4) is lowered by a clamping spring (20), a back pressure is produced in pressurized oil within a second chamber (12) formed below the piston (4). The back pressure pushes an input portion (9a) for clamping provided at a lower end of the clamp rod (9) to a stopper (23) through a bearing (24) and a transmission plate (25). The piston (4) is lowered relatively to the clamp rod (9) at a raised position, whereby the clamp rod (9) is rotated by a converting mechanism (21).

REFERENCES:
patent: 3572216 (1971-03-01), Seesody
patent: 4265434 (1981-05-01), Hamilton et al.
patent: 4560152 (1985-12-01), Miller
patent: 5108079 (1992-04-01), Yonezawa et al.
patent: 5192058 (1993-03-01), VanDalsem et al.
patent: 5282888 (1994-02-01), Fukawa et al.

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