Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1986-06-17
1988-03-22
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72367, 74473P, B21D 5388
Patent
active
047320303
ABSTRACT:
The present invention relates to a method of manufacturing a power-transmission-gear-shifting lever which is made available for conventional passenger cars, trucks, agricultural machinery, civil-engineering and construction machinery, and other machinery by making up said lever with either a plastic or metallic tube, while the invention also relates to the constitution of the lever reflecting its preferred embodiments, wherein the manufacturing method is comprised of the sequential steps of first forming expanded tubular portion by expanding an end of tube with punching means, followed by contraction of the expanded tubular portion into eliptic shape using mold means before eventually cold-forging the eliptic portion into spherical shape, thus allowing the manufacturer to effectively save welding process and simplify assembly process before completing a light-weight gear-shifting lever.
REFERENCES:
patent: 1817854 (1931-08-01), Sorensen
patent: 1888728 (1932-11-01), Johnson
patent: 1896893 (1933-02-01), Hartsock
patent: 2272897 (1942-02-01), Riesing
patent: 2851980 (1958-09-01), Kraicinski
patent: 2971554 (1961-02-01), Knox
patent: 3225581 (1965-12-01), Hinderer
patent: 4603598 (1986-08-01), Tsuji et al.
Kojima Moonray
Larson Lowell A.
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