Method and apparatus for tempering knotted coil springs

Details Method and apparatus for tempering knotted coil springs Method and apparatus for tempering knotted coil springs

1998-01-26

1999-08-03

Echols, P. W.

Metal working

Method of mechanical manufacture

Spring making

29564, 72128, 140364, 148580, 148908, 266252, B21F 3502, C21D 106, B21K 2900

Patent

active

059308974

ABSTRACT:
Disclosed herein is apparatus for fabricating a coil spring including axially opposite end convolutions having respective ends respectively knotted to the associated end convolutions, which apparatus comprises a frame, a coil forming device mounted on the frame and operative to initially form a coil spring including axially opposite end convolutions having respective free ends, a tempering device mounted on the frame and operative to temper the initially formed coil spring, a knotting mechanism mounted on the frame and operative to respectively knot the free ends of the tempered coil spring to the associated end convolutions, and a transport mechanism mounted on the frame and operative to transport the initially formed coil spring to the tempering device, and to transport the tempered coil spring to the knotting mechanism. Also disclosed herein is a method of fabricating a coil spring including an end convolution having an end knotted to the end convolution, which method comprises steps of initially forming a coil spring including an end convolution having a free end, tempering the initially formed coil spring, and knotting the free end of the initially formed and tempered coil spring to the end convolution.

REFERENCES:
patent: 3343573 (1967-09-01), Dillon
patent: 4111241 (1978-09-01), Crown
patent: 4609185 (1986-09-01), Thoenen

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