Machine spindle having a force-amplifier drawbar assembly

Details Machine spindle having a force-amplifier drawbar assembly Machine spindle having a force-amplifier drawbar assembly

2005-12-27

2005-12-27

Ashley, Boyer D. (Department: 3722)

Gear cutting, milling, or planing

Milling

Cutter spindle or spindle support

C409S136000, C408S23900A

Reexamination Certificate

active

06979156

ABSTRACT:
A machine spindle includes a casing and a drawbar assembly disposed in the casing for clamping a tool in place. The drawbar assembly includes a front drawbar having a tool clamp, and a rear drawbar movable rearwardly under a spring force for pulling the front drawbar rearwardly to activate the clamp. A rearward force from the rear drawbar is transmitted to the front drawbar by a wedge arrangement that includes multiple pairs of wedges that have cooperative sliding surfaces that make surface contact (as opposed to line contact) with one another. The cooperative sliding surfaces are configured to provide an amplified rearward force against the front drawbar during a final stage of clamping.

REFERENCES:
patent: 4668137 (1987-05-01), Iwakura
patent: 4863324 (1989-09-01), Blessing
patent: 4915553 (1990-04-01), Lazarevic
patent: 5052866 (1991-10-01), Bauch et al.
patent: 5192061 (1993-03-01), Schaublin et al.
patent: 5251887 (1993-10-01), Arnold et al.
patent: 6722827 (2004-04-01), Anderson
patent: 4330399 (1995-03-01), None

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