Patent US3568392A successfully refreshed from Google Patents.
US3672089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large capacity magazine
Assignee: United States Department of the Army
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Filing: 1969-08-13
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Granted: 1972-06-27
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Expires: 1989-08-13
Abstract
Abstract A large capacity magazine of practical proportions feeds cartridges successively from four columns to a mouth ready for pickup by the reciprocating firearm bolt. During displacement towards the mouth the cartridges are separated by a divider into the two double columns which are in turn converted into single columns by cams on the divider arranged in combination with curved sides of the magazine so that two cartridges are fed consecutively to the mouth from one side of the divider followed by two consecutive cartridges on the other side to prevent jamming at the mouth.
Inventors
- 👤 Stanley D Silsby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:04
CPC Classifications
F; F41; F41A; F41A9/00; F41A9/61; F41A9/64; F41A9/65; F41A9/69
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
232 words
A cartridge magazine for a firearm provided with a reciprocal bolt disposed for successively removing the cartridges from said magazine during reciprocation, said magazine comprising a case adapted for holding four columns of the cartridges in contactual relationship and including a mouth, a divider disposed for separating the four columns of cartridges into two double columns responsive to displacement toward said mouth, a pair of sides each including a bottom section spaced from the opposite one thereof a distance less than four times the diameter of one of said cartridges so as to maintain the four columns of cartridges in oblique relationship responsive to displacement thereof toward said mouth, a curved section extending upwardly and inwardly from each of said bottom sections to form said mouth therebetween, and an outwardly flaring section of each of said curved sections located respective to said divider to permit outward displacement of the two double columns responsive to division of the four columns by said divider, follower means slidingly disposed in said case for biasing the cartridges together toward said mouth, and means for converting each of the two double columns to a single column and controlling the sequence with which the cartridges are positioned from the single columns at said mouth whereby two cartridges are positioned thereat from one of the single columns by two consecutive cartridges from the other one of the single columns.
Claim 2
Dependent Claim
232 words
A cartridge magazine for a firearm provided with a reciprocal bolt disposed for successively removing the cartridges from said magazine during reciprocation, said magazine comprising a case adapted for holding four columns of the cartridges in contactual relationship and including a mouth, a divider disposed for separating the four columns of cartridges into two double columns responsive to displacement toward said mouth, a pair of sides each including a bottom section spaced from the opposite one thereof a distance less than four times the diameter of one of said cartridges so as to maintain the four columns of cartridges in oblique relationship responsive to displacement thereof toward said mouth, a curved section extending upwardly and inwardly from each of said bottom sections to form said mouth therebetween, and an outwardly flaring section of each of said curved sections located respective to said divider to permit outward displacement of the two double columns responsive to division of the four columns by said divider, follower means slidingly disposed in said case for biasing the cartridges together toward said mouth, and means for converting each of the two double columns to a single column and controlling the sequence with which the cartridges are positioned from the single columns at said mouth whereby two cartridges are positioned thereat from one of the single columns by two consecutive cartridges from the other one of the single columns.
Claim 3
Dependent Claim
76 words
The magazine as defined in claim 1 wherein said means for controlling the sequence with which the cartridges are positioned from the single column at said mouth include, a bulbous section extending longitudinally along the length of said divider, a first cam surface formed by said bulbous section on one side of said divider, a second cam surface formed by said bulbous section on the opposite side of said divider, and the respective said curved sections.
Claim 4
Dependent Claim
87 words
The magazine as defined in claim 2 wherein said first and second cam surfaces are so located vertically on said divider that when the leading cartridge located at said mouth for pickup by the bolt is from one of the innermost columns of the two double columns the next cartridge in the same innermost column has contact with the high point of the related said cam surface as an aid in moving the cartridges consecutively in pairs from alternate ones of the single columns to said mouth.
Claim 5
Dependent Claim
196 words
The magazine as defined in claim 2 and including a retainer mounted on said case for translational displacement between an upper operative position and a lower loading position and for pivotal displacement between positions on opposite sides of said divider, said retainer including a bar disposed along said divider in cooperation with said curved sections so that when said retainer is in its loading position the spaces between said bar and said curved sections are greater than the diameter of the cartridges and when said bar is in the operative position the spaces are less than the diameter of the cartridges, and so that when located in a position on one side of said divider the leading cartridge on that side is held between said bar and the related said curved section away from contact by said bolt and the leading cartridge on the opposite side of said divider is held in position for contact by the bolt, and so that said retainer is pivoted to the opposite side of said divider by contact of the leading cartridge when moving to said mouth and there is no other cartridge on the opposite side of said retainer.
Claim 6
Dependent Claim
101 words
The magazine as defined in claim 1 wherein said follower means comprises a follower and a circular coiled spring acting against said follower for biasing said cartridges toward said mouth, and including a pair of last-round positioners pivotally mounted on said follower for transferring the bias of said spring to the four columns of the cartridges and successively to the double columns, to the single columns and finally to the last one of the cartridges in the single columns, and humps formed on said follower for positioning said last-round positioners initially so as to form the four columns in oblique relationship.
Claim 7
Dependent Claim
65 words
The magazine as defined in claim 5 wherein one of said last-round positioners is disposed for camming cooperation with a respective one of said curved sections and the other one of said last-round positioners is disposed for camming cooperation with said divider for displacing the last cartridges in each of the single columns relative to said follower to said mouth for pickup by said bolt.
Claim 8
Dependent Claim
81 words
The magazine as defined in claim 6 wherein each of said last-round positioners is of oval configuration in cross section and comprises a cylindrical surface having the same radius as the cartridges at each end and a channel of the same radius extending symmetrically along each side of each of said last-round positioners between said cylindrical surfaces, and including means for pivotally connecting said follower to each of said last-round positioners at the axis of one of said cylindrical surfaces thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |