Threaded – headed fastener – or washer making: process and apparat – Process – Making internally threaded fastener – e.g. – nut
Reexamination Certificate
2005-05-17
2005-05-17
Tolan, Ed (Department: 3725)
Threaded, headed fastener, or washer making: process and apparat
Process
Making internally threaded fastener, e.g., nut
C470S025000, C470S026000
Reexamination Certificate
active
06893354
ABSTRACT:
A method for manufacturing cold-forged wing nuts is to have a column linear material rolled and compressed into lots of column material units connected continuously and then receiving the steps of shearing, flattening, compressing and trimming, punching, wing forming and threading, able to produce wing nuts with quickness and with less waste material, and also having standardized specifications and high strength as well as property of corrosion resistance. Besides, one more step of forming insert grooves is added between the step of flattening and the step of compressing and trimming, so that the column with wings material unit can be formed with insert grooves, and after finishing the steps of punching, wing forming and threading, a nylon or metallic sheet is inserted in the insert groove and fixedly riveted to produce a wing nut able to prevent loosening under a low or high temperature.
REFERENCES:
patent: 1395762 (1921-11-01), Muff
patent: 2614274 (1952-10-01), Moore
patent: 2714450 (1955-08-01), Chestnut
patent: 5060331 (1991-10-01), Shie
Pro-Techtor Inter-national Services
Tolan Ed
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