Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Clamp structure constitutes sole initial metal-deforming...
Patent
1984-05-11
1986-01-28
Crane, Daniel C.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Clamp structure constitutes sole initial metal-deforming...
72387, 72384, 72309, 72323, 1401025, B21D 1104
Patent
active
045663050
ABSTRACT:
A device for forming orthodontic arches from straight wire blanks comprises a die having a cylindrical surface with multiple wire-receiving grooves situated in planes perpendicular to the die axis. A clamp temporarily applies a clamping force to the wire blank, thereby firmly holding a portion of the wire blank in the groove of the die. The bender has two sweep arms, each pivoted on the die axis. A slide is provided on each of the sweep arms, and is constrained for movement toward and away from the die axis. Each slide carries a circular cylindrical roller mounted in bearings on the slide, for rotation about a roller axis parallel to the die axis. An adjustable toggle mechanism on each arm temporarily locks its roller in a position such that the outer roller surface presses the wire blank into one of the wire-receiving grooves before the arm begins to sweep about the die axis, and throughout the sweeping movement of the arm. Each of the arms is pivotable from a position in which its roller is located adjacent to the clamp to a position beyond the position in which its roller is directly opposite to the clamp. A pivoted positioning block insures symmetry in the arch by engaging one end of the blank and thereby insuring that the exact center of the blank is tangent to the die. The block pivots out of the way to provide clearance for arm movement. The die grooves can be configured to pretorque the arches automatically in the forming operation.
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Duo-Mite Bulletin of Mark Eyelet & Stamping, Inc., Copyright 1980.
Crane Daniel C.
Jones David B.
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