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Patent US4366638A successfully refreshed from Google Patents.
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US4366638A Expired / Lapsed US ⏱️ 0.0 years remaining

Box magazine for firearms

Assignee: Heckler und Koch GmbH
•
Filing: 1981-02-27
•
Granted: 1983-01-04
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Expires: 2001-02-27
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Abstract

Abstract The present invention relates to a box magazine for firearms, having a longitudinal housing (1), one end thereof being provided with an ejection opening for the frontmost cartridge contained in the magazine; it includes a follower, spring loaded in the direction of this ejection opening and being in a contacting relationship with the last cartridge, and with the follower spring, designed as a scroll spring (13), whose one end is attached to the housing in the vicinity of the ejection opening and whose scroll spring shaft (11, 12) is mounted on the follower (4) and whose axis is arranged at right angles to the direction of motion of the follower. In order to design a magazine of this type in such a manner that the length of the stack of cartridges is only somewhat less than the overall length of the magazine and that the magazine is suitable for use with small arms having a high firing cadence, when rolled up the scroll spring (13) assumes generally the full cross-sectional area of the magazine, the axis of the scroll spring shaft (11, 12) is arranged at right angles to the longitudinal axis of the cartridges and a spiral spring (9), supporting the effect of the scroll spring (13), is housed within the scroll spring (FIG. 1).

Inventors

  • 👤 Dieter Ketterer
  • 👤 Horst Jakubaschk
  • 👤 Erich Weisser

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 10:48
CPC Classifications
F; F41; F41A; F41A9/00; F41A9/61; F41A9/64; F41A9/65; F41A9/70

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 159 words
A box magazine for firearms, having a longitudinal housing, one end thereof being provided with an ejection opening for the frontmost cartridge contained in the magazine, a follower spring loaded in the direction of the ejection opening and being in a contacting relationship with the last cartridges, and with a follower spring generating the spring force, designed as a scroll spring, whose open end is attached to the housing in the vicinity of the ejection opening and whose scroll spring shaft is mounted on the follower and whose axis is arranged at right angles to the direction of motion of the follower, in which when rolled up, the scroll spring assumes generally the full cross-sectional area of the magazine, in which the axis of the scroll spring shaft is arranged at right angles to the longitudinal axis of the cartridges, and in which a spiral spring, supporting the effect of the scroll spring, is housed within the scroll spring.
Claim 2
Dependent Claim 159 words
A box magazine for firearms, having a longitudinal housing, one end thereof being provided with an ejection opening for the frontmost cartridge contained in the magazine, a follower spring loaded in the direction of the ejection opening and being in a contacting relationship with the last cartridges, and with a follower spring generating the spring force, designed as a scroll spring, whose open end is attached to the housing in the vicinity of the ejection opening and whose scroll spring shaft is mounted on the follower and whose axis is arranged at right angles to the direction of motion of the follower, in which when rolled up, the scroll spring assumes generally the full cross-sectional area of the magazine, in which the axis of the scroll spring shaft is arranged at right angles to the longitudinal axis of the cartridges, and in which a spiral spring, supporting the effect of the scroll spring, is housed within the scroll spring.
Claim 3
Dependent Claim 30 words
The magazine set forth in claim 1, in which the scroll spring shaft, to which the inner end of the scroll spring is attached, is designed as a cylindrical housing.
Claim 4
Dependent Claim 43 words
The magazine set forth in claim 1, in which the outside diameter of the scroll spring shaft is smaller than the corresponding clear height (cartridge length) of the magazine by an amount equal to approximately twice the winding thickness of the scroll spring.
Claim 5
Dependent Claim 19 words
The magazine set forth in claim 2, in which the spiral spring is housed in the scroll spring shaft.
Claim 6
Dependent Claim 36 words
The magazine set forth in claim 4, in which one end of the spiral spring is attached to the shaft, with the other end being attached to a pin which is fixedly attached to the follower.
Claim 7
Dependent Claim 40 words
The magazine set forth in claim 5, in which the follower displays a lateral extension, extending in the longitudinal direction of the magazine, to which the pin is attached and which is guided between two longitudinal beads of the magazine.
Claim 8
Dependent Claim 49 words
The magazine set forth in claim 5, in which the clearance between the pin and an end plate of the follower, against which the last cartridge is in a contacting relationship, is only slightly greater than one half of the outside diameter of the scroll spring when wound up.
Claim 9
Dependent Claim 19 words
The magazine set forth in claim 1, in which the spiral spring generates approximately 1/4 of the follower force.

References Cited (Backward Citations)

US2777235A Cited
US3087270A Cited
CH406904A Cited
US3577860A Cited
US3906652A Cited
CH598560A5 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-01-03 1986-07-05 1987-01-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-01-03 1990-07-05 1991-01-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-01-03 1994-07-05 1995-01-04 $7700.00 Window Closed / Lapsed

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