US3726038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectilinear magazine
Assignee: Individual
•
Filing: 1971-10-12
•
Granted: 1973-04-10
•
Expires: 1991-10-12
Abstract
Abstract A small arms magazine has a rectilinear form and the arcuate segmental configuration of a stack of nested tapered cartridges is accommodated by a follower loaded by a biasing spring. The spring has a plurality of turns and at each turn a pair of opposed re-entrant portions freely engage opposed complementary internal ridges in opposed side walls of the magazine. The last half turn of the spring is raised at a greater angle than the other turns with the spring in a free state. When full, the follower is inclined at a maximum angle to the closed end of the magazine and this angle decreases progressively toward zero as the magazine is emptied.
Inventors
- 👤 D Bredbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:53
CPC Classifications
F; F41; F41A; F41A9/00; F41A9/61; F41A9/64; F41A9/65; F41A9/70
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
137 words
A small arms magazine comprising an elongate rectilinear casing having a pair of opposed side walls each having at least a first elongate ridge, a base plate, and means defining an opening at the opposite end of the casing from the base plate for dispensing cartridges singly therefrom, an elongate spring having a plurality of turns with two portions formed therein to cooperate slidingly with a respective ridge on each side wall, and a follower member rigid with the end of the spring remote from the base plate, the said portions of the turns of the spring and the ridges of the side walls serving to guide the spring irrespective of its actual length and thereby to accommodate tilting of the follower member from a maximum with the magazine filled to a minimum with the magazine empty.
Claim 2
Dependent Claim
137 words
A small arms magazine comprising an elongate rectilinear casing having a pair of opposed side walls each having at least a first elongate ridge, a base plate, and means defining an opening at the opposite end of the casing from the base plate for dispensing cartridges singly therefrom, an elongate spring having a plurality of turns with two portions formed therein to cooperate slidingly with a respective ridge on each side wall, and a follower member rigid with the end of the spring remote from the base plate, the said portions of the turns of the spring and the ridges of the side walls serving to guide the spring irrespective of its actual length and thereby to accommodate tilting of the follower member from a maximum with the magazine filled to a minimum with the magazine empty.
Claim 3
Dependent Claim
17 words
A magazine according to claim 1, wherein said ridges are internal and said spring portions are concave.
Claim 4
Dependent Claim
14 words
A magazine according to claim 1, wherein said first ridges lie opposite one another.
Claim 5
Dependent Claim
16 words
A magazine according to claim 1, wherein each side wall has second and third rectilinear ridges.
Claim 6
Dependent Claim
74 words
A magazine according to claim 1, wherein each turn of the spring is of elongated form and includes a pair of opposed straight portions, a pair of opposed concave portions each of which forms a continuation of one of the straight portions, and a pair of opposed semi-circular end portions, one of said end portions serving to join the concave portions and the other of said end portions serving to join the straight portions.
Claim 7
Dependent Claim
22 words
A magazine according to claim 1, wherein the spring exerts greater pressure on the back of the follower than on the front.
Claim 8
Dependent Claim
43 words
A magazine according to claim 6 in which the upper terminal turn of the spring, when in its free state, is raised at a greater angle than the other turns in order to exert said greater pressure on the back of the follower.
Claim 9
Dependent Claim
16 words
A magazine according to claim 4, wherein said rectilinear ridges are disposed internally of the magazine.
References Cited (Backward Citations)
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Cited
US1858862A
Cited
US2795880A
Cited
US2777235A
Cited
US2903809A
Cited
US3440751A
Cited
US3619929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |