Pin for use in a workpiece clamping apparatus

Details Pin for use in a workpiece clamping apparatus Pin for use in a workpiece clamping apparatus

1990-03-08

1991-06-25

Howell, Daniel W.

Gear cutting, milling, or planing

Milling

Work support

269 54, 269 544, 269156, 279110, 409219, B23Q 300

Patent

active

050262220

ABSTRACT:
A pin for use in a chuck for clamping a discoid portion of a workpiece, the chuck including a base, at least to fixed clamps secured on a front end surface of the base, a movable clamp adjacent to the front end surface of the base and the pin secured to the front end surface of the base. The pin is adapted to fit in a hole formed in a discoid when the discoid is mounted on the chuck wherein the hole has a larger diameter than the pin. The pin has generally rhombic transversed section with a long diagonal and a short diagonal. The pin is truncated by a predetermined amount at each end along the long diagonal to allow the workpiece to move a limited distance relative to the pin along a line formed by the short diagonal. The limited distance may be a function of an initial clearance between the discoid portion and the chuck or a function or a variation between the diameter of the discoid portion and its design diameter, or a function of both. In the preferred embodiment, the predetermined amount truncated from each end of the pin is a function of 1/2 the difference between the long diagonal and the square root of the difference between the long diagonal squared and the limited distance squared.

REFERENCES:
patent: 1349963 (1920-08-01), Jerrim
patent: 1372661 (1921-03-01), Secord
patent: 2524006 (1950-09-01), Capelazzi
patent: 2541605 (1951-02-01), Ohlsson
patent: 2955820 (1960-10-01), Berg
patent: 4286778 (1981-09-01), Follmeyer
patent: 4433564 (1984-02-01), Fukushima et al.
patent: 4436465 (1984-03-01), Fukushima et al.
patent: 4456051 (1984-06-01), Hukuhara
patent: 4487248 (1984-12-01), Fukushima et al.
patent: 4572276 (1986-02-01), Hukuhara
patent: 4930955 (1990-06-01), Kawano et al.

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