Threaded – headed fastener – or washer making: process and apparat – Apparatus for making internally threaded fastener – i.e. – nut – Having tapper
Patent
1992-01-15
1993-04-06
Larson, Lowell A.
Threaded, headed fastener, or washer making: process and apparat
Apparatus for making internally threaded fastener, i.e., nut
Having tapper
470 18, 470167, B21D 5324
Patent
active
051999277
ABSTRACT:
A machine and method for continuous thread tapping of threads in fasteners such as nut blanks or the like having a fastener blank advancement mechanism incorporated into a fastener blank holding and guidance assembly. A continuous stream of fastener blanks are fed into and securely held and advanced onto a tap by a modular worm jaw assembly. Fastener blanks are continuously fed into the worm jaw assembly so that a continuous progression of blanks are advanced onto the tap by forward turning of worms rotating within laterally opposed jaws which hold the fastener blanks and prevent them from rotating as they are advanced over the rotating tap. Once the nut blank is advanced over the tap, it is pushed by a progression of successive nuts along the length of the shank which supports the tap to the end of the shank opposite the tap die from which the tapped nuts drop into a receptacle. The worm jaw assembly is of modular construction to facilitate easy removal and replacement. The worm jaw assembly is positioned upon laterally screw adjustable gibs to allow lateral adjustment of opposing worm jaws to accommodate fasteners of various sizes. The shank and a sleeve which supports the nuts as they progress along the length of the shank beyond the tap are encased in a hinged assembly to allow easy access to the shank, tap and sleeve for removal and replacement. The rate of rotation of the tap relative to the rate of rotation of the worm jaw advancement assembly is synchronized to insure that the nuts are tapped at the correct pitch.
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Larson Lowell A.
McKeon Michael J.
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