Clamping apparatus

Details Clamping apparatus Clamping apparatus

1992-06-11

1992-12-29

Watson, Robert C.

Work holders

With fluid means

Plural positioning means sequentially operated

269137, B23Q 308

Patent

active

051745542

ABSTRACT:
A first piston (11) is inserted into a second piston (12) within a housing (4). An acting point portion (A), a fulcrum portion (C) and a wedge type pressure receiving surface (B) are provided in the first piston (11) in order from front side. A first swing gap (37) and a second swing gap (38) are provided in a space below the front portion of the first piston (11) and in a space above the rear portion thereof respectively. The second piston (12) is provided with a pushing surface (F) facing the pressure receiving surface (B) from below. At the time of clamping, by a fluid pressure within a first actuation chamber (21) both the pistons (11) (12) are advanced and after that the second piston (12) is advanced relative to the first piston (11). Thereupon, the acting point portion (A) is swung downwardly about the fulcrum portion (C).

REFERENCES:
patent: 4365792 (1982-12-01), Johns
patent: 4508871 (1985-03-01), Yonezawa
patent: 4932640 (1990-06-01), Shirakawa
patent: 5071109 (1991-12-01), Yonezawa

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