Method of producing semicircular washers having a projection to

Details Method of producing semicircular washers having a projection to Method of producing semicircular washers having a projection to

1979-10-05

1982-01-19

Rosenbaum, Mark

10 73, 72168, B21D 5320

Patent

active

043109390

ABSTRACT:
In producing a semicircular washer having a projection to prevent rotation formed thereon, a blank material in the form of a flat bar is forced to pass a roll caliber between upper and lower forming rolls arranged in a pair and bent on and along one of the forming rolls while being pressed in the breadthwise direction to become a semicircular washer. The semicircular washer then has its outer marginal portion punched out by means of a punch and a die to form thereon a projection for preventing rotation. The method ensures an increase in the yield of semicircular washers having a projection for preventing rotation and enables the projection to be formed in any position on the washer as desired.

REFERENCES:
patent: 2043665 (1936-06-01), Iversen et al.
patent: 3902209 (1975-09-01), Gohs
patent: 4151733 (1979-05-01), Iijima

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