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US 4,049,026 AGranted
Bending apparatus having a shaped mandrel used in automatic bending machines for metal wire and bar stock
OwnerRemigio Del Fabroinventor
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OwnerRemigio Del Fabroinventor
Estimating the term…
An automatic bending apparatus for forming fasteners from metal wire strip, or bar stock includes a removable, axially movable, non-rotatable shaped central mandrel and a relatively rotatable faceplate mounting a bending pin disposed coaxially with the mandrel and independently axially movable relatively thereto. The apparatus includes a pair of shears positioned adjacent the mandrel along the path of movement of the stock and in advance of the mandrel and means for automatically feeding the stock. The invention is characterized in that the mandrel is substantially L-shaped and has a support rod and an arm with a U-shaped groove in the front face thereof through which the stock passes. The groove is dimensioned to closely receive the stock so that the supported portion therein is not deformed or bent during the bending operation and the external portion of the mandrel is shaped to define the curvature of the bent portions of the stock. The face of the mandrel is tapered to laterally deflect the previously bent end so that the other end may be bent without interference from a previously bent portion.
Bending apparatus for use in automatic bending machines for metal wire, strip or bar stock and in particular for automatic bending machines for forming fasteners with continuous feeding comprising an axially movable, removably mounted, non-rotatable shaped central mandrel and a relatively rotatable and axially movable faceplate mounting a peripheral bending pin disposed coaxially therewith, a pair of shears disposed adjacent the mandrel in advance of the mandrel along the path of the movement of the stock past the mandrel, and means to automatically feed the stock through the mandrel, characterized in that the said central non-rotatable mandrel has substantially an L-shape and comprises a support rod lying axially at the center of rotation of said bending pin and an arm disposed perpendicularly to the support rod and having a U-shaped groove in the front face thereof, the groove being dimensioned to provide a passage for and to closely receive the stock to support the received portion against bending during bending and means for actuating the shears to sever the fastener from the stock after it is formed.
Dependencies are inferred from the claim text.