Aperture setting device

Details Aperture setting device Aperture setting device

1982-03-25

1984-06-19

Stearns, Richard R.

Geometrical instruments

Area integrators

Electrical

29751, G01B 500, B23P 1900

Patent

active

044546572

ABSTRACT:
An aperture setting device for use in a drawing die, a chuck and so forth, in which at least three or more substantially triangular movable pieces are sequentially arranged in the form of a ring, an aperture is formed by one end portion of an inner side of each movable piece and the movable piece is movable along a side opposite its vertical angle on the side of the aperture, together with the other movable pieces. The movable pieces are disposed in a frame. By the movement of the movable pieces, the aperture can be varied in size without being changed in configuration.

REFERENCES:
patent: 1576346 (1926-03-01), Mendell
patent: 1878296 (1932-09-01), Schmidt et al.
patent: 2638676 (1953-05-01), Callahan
patent: 2827941 (1958-03-01), Stoltz
patent: 3325885 (1967-06-01), Ziegler, Jr. et al.
patent: 3859728 (1975-01-01), Shutt
patent: 4041766 (1977-08-01), Johnson et al.

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