Metal deforming – Process – Deforming sheet metal
Patent
1988-08-19
1989-08-01
Larson, Lowell A.
Metal deforming
Process
Deforming sheet metal
160191, B21D 5116
Patent
active
048523780
ABSTRACT:
A spring retainer member of lightweight steel construction material formed in accordance with a method comprising the steps of die stamping a square blank of steel construction material, notching out triangular shapes at each of the midpoints between the four corners of the square blank to form between adjacent notches four radially oriented arms extending at 90 degrees to each other, die stamping a shaft-receiving hole centrally of the blank for the subsequent projection therethrough of a shaft, forming in an initial shaping step a cylindrical shape in the blank in the area of the shaft-receiving hole, and forming in a subsequent shaping step a completed cylindrical shape by bending the four arms into adjacent position to each other incident to closing the previously removed triangular shaped notches, whereby the resulting spring retainer member is adapted to be disposed on a shaft of an overhead door mechanism and attached to an end of a counterbalance spring and to a drum support of the overhead door mechanism.
REFERENCES:
patent: 1278404 (1918-09-01), Washburne
patent: 1433881 (1922-10-01), Fancher et al.
patent: 2307095 (1943-01-01), Zaferakis
patent: 2350286 (1944-05-01), Michelman
patent: 3289523 (1966-12-01), Kramer
Amer Myron
Larson Lowell A.
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