US2512014A

US2512014A - Automatic inertia-locked firearm with automatic hammer

Info

Publication number: US2512014A
Application number: US764441A
Authority: US
Inventors: Eglin Hans
Original assignee: Werkzeugmaschinenfabrik Oerlikon Buhrle AG
Current assignee: Rheinmetall Air Defence AG
Priority date: 1942-11-13
Filing date: 1947-07-29
Publication date: 1950-06-20
Anticipated expiration: 1967-06-20
Also published as: FR899509A; CH233877A

Description

June 20, 1950 E'GUN 2,512,014

' AUTOMATIC INERTIA-LOCKED FIREARM WITH AUTOMATIC HAMMER Filed July 29, 1947 2 Sheets-Sheet 1 Rig. 7

INVENTOR HA/VJ [GU/V 1 ATTDR/VEYJ June 20, 1950 2,512,914

H. EGLIN AUTOMATIC INERTIA-LOCKED FIREARM WITH AUTOMATIC HAMMER Filed July 29, 1947 2 Sheets-Sheet 2 m mvTo/e HANS Eel/iv ax n'rromsvs war Patented June 20, 1950 WITH AUTOMATIC v Hans Eglin, Geneva, Switzerland, assignor to Ma.-

tutu

chine Tool- Works OerIikon Administration Company, Zurich-Oerlikon; Switzerland, a;

company of Switzerland Application .iui'y 29,1947;-seria1-Nb.7e4;441

In'Switzerland November 13, 1942 Seotionl, Public Law 690, August 8,1946 Patent expires November 13, 1962 In automatic inertia-locked firearms the movement o'fthe striker pin is brought about by a lever which, on reaching the firing position, butts against a cam or projection arranged in the path of the breech block and, in consequence, the striker pin impels forward. The rearward movement of the striker pin is also brought about by the same lever which, in the course of the rearward movement of the breech ;block, .again butts on the said cam or projection, thus causing the striker pin to move rearwards.

It has now been found that the said lever which is controlledbythe camorjprojection arranged in the path of the breech block and brings about the movement of the striker pin, is liable to break if the weapon remains in use for some prolonged time. Th destruction of this lever moreover may take place through other circumstances, for instance, defects of material.

One consequence of the rupture of the said lever is that the cartridge introduced by the breech block is not fired. As a result, the breech block strikes hard against the cartridge chamber and experience has shown that under certain conditions the striker pin may be impelled forward to such an extent through this hard blow that a delayed ignition of the cartridge takes place. Such a so-called delayed ignitionin which the cartridge is not ignited on the forward stroke of the breech block but only after the breech block has struck hard against the cartridge chamberhowever, is to be avoided. One aim of this invention is, therefore, to stop further firing in the event of the rupture of the said lever controlling the striker pin.

A further aim of the present invention is to provide a device in inertia-locked automatic firearms, by means of which it is made possible to prevent a belated ignition of the cartridge in the event of the rupture of the lever controlling the movement of the striker pin.

Accordingly, in an automatic inertia-locked firearm in which the striker pin is actuated by a lever controlled by a cam or projection provided in the path of the breech block, the present invention provides an additional cam or projection carrying back the lever, and consequently the striker pin, as soon as the breech block runs beyond the normal front reversal position. The result thus obtained is that in case the said lever controlling the movement of the striker pin should break and the breech block strike hard against the cartridge chamber, the striker pin will not be hurled forward under the eifect of inertia, and therefore will not ignite the carzonims. (01. 89-151)" tridge, but oh the'contrary will remain in its rearposition. i. e'., will reach the firing position.

The accompanying drawingsfshow. one constructional embodiment of thepresnt invention. On the drawings:;

Fig} 1 is a diagrammatic representation of an,

inertia-locked automatic firearm.

Fig.2 is a section through the firearmshowing the disposition of the striker pin and of the members controlling it in the positions they occupy during the forward travel .of the breech block;

Fig. 3 is'a section through the firearm showing the dispositon of the striker pin and of. the members controlling it in the firing position;

Fig. 4 is a section through the firearm showing the disposition of the striker pin and of the members controlling it in the positions they occupy in the normal front reversal position;

Fig. 5 is a section through the firearm showing the disposition of the striker pin and of the members controlling it where there is no cartridge in the chamber; and

Fig. 6 is a section through the firearm showing the disposition of the striker pin and of the members controlling it in the positions they occupy after the rupture of the said lever controlling the striker pin.

Referring to the drawings:

The barrel I is inserted in the usual manner into the breech casing 2 in which the breech block 3 reciprocates. The breech block is connected by means of a cross-key t through the breech bar 5, with the tube 6 guiding the recuperator spring 1 which is fitted round the tube. The striker pin 9 is fitted in the breech block 3 in a central bore 8 and its striker point is guided in a member it fitted in the breech block 3. The striker pin comprises two shoulders H and I2 arranged on opposite sides of a lever it pivotally arranged on a pin I l. The lever I3 is provided with two spaced finger-shaped projections l5 and it. In the breech casing 2 is inserted a plate ll provided with two cam-like projections 88 and l 9. The cartridge is designated by the reference numeral 20.

The working of the above described arrangement briefly is as follows:

On its forward travel the breech block 3 pushes a cartridge 20 into the cartridge chamber. As soon as the breech block has reached a definite firing position the projection it on the lever 53 contacts the cam 18 provided in the path of the breech block. The lever 13 is thus forced to pivot round the pin M and thus causes the striker pin I 7 3 9 to strike the cartridge 20 and to fire it (Fig. 3).

Fig. a shows the front reversal or the breech block when the cartridge 20 is; fired. The pro-f jection [5 does not reach as far as the cam l9. If new the breech block again travels rearwards the projection 15 is forced upwards by the cam I8, thus causing the lever I3 again to pivot around the pin l4 and carry back the striker pin 9- (Fig. 2).

Referring to Fig. 5, if there is. no. cartri ge in. the barrel the breech block runsbeyond its nor-. mal front reversal position. In this case, however, the projection l5 comes; within the,- range of action of the cam l9 and the striker pin 9; is, carried rearwards.

The action is similar in the case ofa rupture of the projection l6 of the lever 13; Firing cannot take place in this case and there would arise the danger mentioned above, namely that with the hard impart of the breech block on. the car tridge chamber the striker pin 9 could be hurled forward" and subsequently ignite the cartridge. o e e n. his as e l e 13; is ca sed to revolve around the pin 14 by the projection l5 shoulders, a cam-lever pivotally mounted in said breech block and adapted to engage consecutively said two shoulders to move said striker pin forwardly and rearwardly, a forward proi ction and a.v rea p ojection upon. said camlever, a. plate. upon saidf breech casing, a forward projection on said plate for engagement with the forward projection of said cam-lever in the event of the breakage of the cam-lever, and a rear projection on said plate which is engaged by the rear projection of said cam-lever during the; reeiprocation of; said breech block to turn said cam-lever and; thereby operate said striker pm. 2. Anautomatic inertia-locked firearm in accordancewith claim 1, wherein the forward projection err said plate is located at a distance HANS REFERENCES, CITED The following references are of record in th file f thi p t nt:

UNITED STATES PATENTS Number Name Date 2,251,304 summerbell Aug. 5,, 19411 FOREIGN BATENTS- Number Country Date 305,919 Great Britain Apr. 4, 1929