US2429831A

US2429831A - Magazine for automatic firearms

Info

Publication number: US2429831A
Application number: US527045A
Authority: US
Inventors: Lippert Hanns; Schalkli Otto
Original assignee: Werkzeugmaschinenfabrik Oerlikon Buhrle AG
Current assignee: Rheinmetall Air Defence AG
Priority date: 1943-03-19
Filing date: 1944-03-18
Publication date: 1947-10-28
Anticipated expiration: 1964-10-28
Also published as: FR899840A; CH234141A

Description

Oct. 28, 1947; H. LIPPERT ET AL 2,429,831

MAGAZINE FOR AUTOMATIC FIREARMS Filed March 18, 1944 In veniors Hanna L L'Hmri i. 0H0 SC/mlxli ATTORNEHS Patented Oct. 28, 1947 MAGAZINE FOR AUTOMATIC FIREARMS Hanns Lippert and Otto Schalkli, Zurich,

Switzerland, assignors to Verwaltungsgesellschaft der Werkzeugmaschinenfabrik Oerlikon, Zurich-Oerlikon, Switzerland Application March 18, 1944, Serial No. 527,045 In Switzerland March 19, 1943 3 Claims.

In automatic fire-arms the cartridges are placed in a magazine mounted above the breech block. The breech block on its forward travel introduces each time one cartridge into the cartridge chamber, and under the action of the spring fitted in the magazine the next cartridge is brought to the magazine outlet. The breech block on its forward travel which has to introduce -a cartridge into the cartridge chamber now first imparts to the cartridge a short blow since the impact on the stationary cartridge takes place at a certain velocity. It may now occur that under the effect of the blow the cartridge acquires a velocity exceeding the velocity of the breech block on its forward travel, the consequence being that the cartridge to be introduced into the cartridge chamber drops in front of the extractor claw fitted on the beech block. As a result, after the firing of the cartridge the empty cartridge case is not extracted out of the cartridge chamber. This is naturally connected with troubles (Cl. la-50) 2 Figure 3 is a section along the line 3-3 of Figure 1;

Figure 4 is a section along the line 4-4 of Figure 1. 6 In the drawings, the magazine has an outlet which should be avoided at all costs in automatic fire-arms.

The object of the present invention is to select for the magazine outlet a design eliminating the possibility for the cartridge to drop in front of the extractor claw under the efiect of the blow imparted to it by the breech block on its forward travel.

According to the present invention this object is secured by providing the front ends of the guiding ledges fitted at the magazine outlet for the cartridge to be fed-with two projections facing each other and encompassing the cartridge case. The diameter of these projections is greater than the diameter of the cartridge case at its front end, so that the cartridge is able to glide on the guiding ledges; on the other hand it is smaller than the rear part of the tapered cartridge case. As a result, the cartridge case impelled forward by the breech block on its forward travel is clamped between the two projections, and can only be forced out of the guiding lips by the elastic widening of the magazine bottom. The guiding ledges facing each other are formed complemental to the shape of the cartridge and suitably encompass it above the middle aXis so as to make it impossible for the cartridge to escape upwards whilst the breech block is impelling it forward.

The attached drawing shows in Figs. 1-4 details of the subject of the invention.

Figure 1 is a longitudinal vertical section. of the outlet portion of a magazine embodying the present invention;

Figure 2 is a bottom plan of the same;

portion l, and internal longitudinal guiding ledges 2 formed in the walls thereof adjacent the lower boundary. The ledges 2 comprise rear portions l6 corresponding in shape to portions of the rear of the cartridge 3, and arcuate inwardly extending

projections

4 and 5 somewhat forward of midway longitudinally of the magazine, and adapted to engage on opposite sides thereof arcs of the case 10 of the cartridge 3.

The upper halves 12 of the

projections

4, 5, extend longitudinally coincident with the projections, and the lower halves l4 merge with portions l6' of the ledges 2. The magazine interior wall has fiat portions [5 above the portion I 6, and below the latter are the flat portions [7, which are inward of the portions l'5.

The ejection guide portions ll connect the interior surfaces of the

projections

4, 5, to the magazine wall forward of the projections. The feed guide portions l3 connect the upper half portions l2 of the

projections

4, 5, to. the fiat portion l5 of the magazine wall rearward of the projections.

The distance 6 between the

projections

4, 5, is greater than the diameter 1 of the cartridge at the corresponding point longitudinally, and smaller than the greatest diameter 8 of the cartridge. The magazine is of resilient construction so that the rear portion of the cartridge, having the greatest diameter 8, can drive the projections, 4, 5, apart and pass between them.

In operation, a cartridge in the position shown is driven forward by the breech block, not shown. As the cartridge diameter increases on a taper toward the rear, the

projections

4, 5, will first engage the cartridge well in advance of the point of greatest diameter 8, which is greater than their own included distance 6. This engagement extends above and below the axis of the cartridge, and keeps it pointed straight for the gun chamber, meanwhile braking or decelerating it. The cartridge is thus kept in steady engagement with the breech block which is advancing it, and cannot bounce ahead of the breech block and be fired ahead of time. Of course, the resilient construction of the magazine permits the tapered cartridge to wedge apart the

projections

4, 5, suflicient to permit passage of the cartridge. Since the breech block is properly engaging the cartridge, the extractor claw 0n the breech block is 3 also in proper engagement and will extract the cartridge when fired.

We claim:,

1. An outlet portion for a firearm magazine, said outlet portion being constructed and arranged to accommodate tapered-case cartridges of a given caliber, and comprising resilient walls having formed therein guiding ledges, said ledges comprising a rear portion corresponding to portions of the rear portion of a cartridge, front portions on said ledges comprising inwardly extending projections each formed with an arcuate cartridge engaging surface extending above and below the axis of the cartridge, the included distance between said projections being smaller than the greatest diameter of a cartridge of said given caliber, whereby said projections are adapted to brake said cartridge in its forward travel and keep it in engagement with the breech block of the fire arm. 7

2. A magazine according to claim 1, said projections being two in number and located. opposite each other.

3. outlet for a firearm magazine, said 0111;-v

let portion'being constructed and arranged to accommodate tapered-case cartridges of a iv n caliber, and comprising resilient Walls havin formed therein guiding ledges, said ledges comprising rear portions corresponding to portions of v upper half portions comprising portions connecting said upper half portions to flat wall portions of said magazine adjacent said guide ledges, the included distance between said projections being smaller than the greatest diameter of a cartridge of said given caliber.

HANNS LIPPERT.

r OTTO scHALKLI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,192,677 Hoagland et a1. V V Mar. 5, 1940 2,360,035 Birkigt F Oct. 10, 1944 403,765 Mauser V V May 21, 1889 441,673 Krnka Dec. 2, 1890 2,007,774 Sedgley et all. -r July 9,1935 2,081,235 Hi11yard May 25, 1,937