Constant force spring for cartridge magazines

Details Constant force spring for cartridge magazines Constant force spring for cartridge magazines

1988-02-29

1989-11-14

Jordan, Charles T.

Firearms

Breech loading

Magazines

267156, F41C 2502, F16F 110

Patent

active

048798282

ABSTRACT:
Our invention relates to an improved anti-curl feature for constant-force springs to be used in lifting a stack of shells by means of a follower in a multiple cartridge magazine for firearms thereby lessening the transverse curl in at least the uncoiled portion thereof that is responsible for causing its side margins to dig into the wall of the shell casing or bullet or both and cause jamming, such improvement comprising the localized weakening of spring along a longitudinally-extending line spaced between its side margins such that it lies flatter, preferably by providing same with a single column of longitudinally-spaced apertures or two or more such columns thereof in which adjacent pairs thereof are transversely misaligned. Our invention also encompasses the method of eliminating the aforementioned jamming problem by locally weakening the spring longitudinally such that at least its uncoiled portion lies flatter. The improved method also contemplates thickening the spring to compensate for its loss in spring force resulting from the localized weakening.

REFERENCES:
patent: 345767 (1886-07-01), Buckley
patent: 630503 (1899-08-01), Greenfield
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patent: 2609192 (1952-09-01), Lermont
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patent: 3007239 (1961-11-01), Lermont
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patent: 3533431 (1970-10-01), Kuenzel et al.
patent: 4407006 (1983-09-01), Holick et al.
patent: 4580364 (1986-04-01), Vyprachticky
patent: 4765081 (1988-08-01), Dieringer
patent: 4776122 (1988-10-01), Dieringer et al.

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