US2361180A - Firearm - Google Patents

Description

@Ct 24, i944 J. DOBREMYSL gmag@ FREARM Filed Feb. 23, 1941 2Sheets-Sheet l INVENTOR. JOSEF DOBEMYSL.

Usi., 249 E944. J, DOBREMYSL FIREARM 2 Sheets-Sheet 2 Filed Feb. 2B, 1941 F`IG.5.

INVENTOR. JOSEF DOBEMYSL.

Patented Oct.l 24, 1944 FIREARMY.

JosefDob'emysl,- Cambridge, England Application February 28, 1941;` ,Serial-N0.3.8.1409?v In GreatfBritain Novemhenl'l, 1939.'

1 Claim.

This.; invention relates :to` fire arms.:

Oneobject of the'V inventionis; to provide-dore easy dismantlingw oi" gunszwithouti thenecessity: of placing damaged parts onthe ground?andtor` operate. guns also inv prostrate; position of the: gunner.,

Another object of `.the invention is to provideA means ifor easy and quick. opening-1 oftheirear` part of the gunandtilting this partzoutv oftlie path` of' the breech mechanism-whenremovingA the latter fromthe gun.

A' further object ofthe-'invention is `to provide meansior preventing `the rear part of Athe-gun tobetilted until it'has been drawn into itsrearmost` position.

Anotherobject of the-invention isto providemeans renderingthe gun body sturdy and-resisting to bending stresses-annifdeformations"in operation of the gun.

A stillfurtherobject of the invention is to provide improved means for elastically absorbing the shocks to which the gun or its parts are subjected in operation or handling.

According to the invention the trigger housing with the shoulder piece are made as vone unit which with its associated parts is arranged for longitudinal sliding movement along the casing of the gun and after releasing a suitable locking device it can be drawn back and in its retracted position tilted down and the shoulder piece set on the ground, so that in combination with the support or bipod it may be used to support the gun with the breech in the open position clear of the ground. The breech mechaism which is slidably mounted, can then be drawn back so as to be freely accessible for inspection, adjustment or exchange of parts. When the cause of failure has been removed the mechanism can be pushed forward to its normal position and the rear part of the fire arm, after being raised about its pivot, can be pushed forward and secured in position by the locking device.

Other objects, features and advantages will appear from the drawings and the description hereinafter given.

One way of carrying out the invention is shown in the accompanying drawings, wherein Fig. l is a side view of the rear part of the gun in its normal position,

Fig. 2 is a side View, partly in section, showing how the gun' is supported for the purpose of removing the mechanism,

. Fig. 2a is a side View, partly in section, showing themec'hanism'aof zthe'fgun'removedtfrom lthe casingv oither Fig.3 representsa side View.v of a'part of the gung. adjacent' of the trigger housing; with: the

rea-r, -par.tipartly'v drawn ,back in" the directionfof.

the arrow A.

Fig. 4 is a similar view of the part ofthe'gun asi illustrated in Fig.: 3 butl withy the. reary part swung-down.

Fig.z5 is a crosssection of .the-gunf-.taken'on the` line. 5-5wofFigi 3 showing'a: detailoffthe .gun`

in its open position.v

Fig. dis across'sectiontaken' on the line 6`6 of; Fig; 7 -on ailarger scale illustrating the guide;

Fig.; 7 is a sectional pview offthe-.buier device drawings,;.V comprises acasing`A I..` connected' withzthebarrell.. The breechmecham'sm may.

be of any design and in the present example a breech mechanism of the tilting breech block type is shown. It consists substantially of a breech block 3, breech block carrier 4 and recoil spring 5. These parts are'shown in Fig. 2 in their working position and in Fig. 2a in a retracted position removed from the gun casing. The gun may be arranged for any type of feeding and in the drawing feeding from a magazine 6 is shown. The operation of a breech mechanisrn of this kind is well known and need not be described in detail.

A trigger mechanism 'I is arranged in a trigger housing 8. The trigger mechanism itself may be of any design and does not form part of the present invention. A guide 9 for the recoil spring 5 is mounted in the trigger housing. At

the rear end of the trigger housing 8 a shoulder piece I0 is secured, preferably by bolts or in any other Way. The shoulder piece forms thus one unit with the trigger housing. A longitudinal slot II is provided in the trigger housing for the passage of a locking bolt I2 which serves to fasten the trigger housing in its operative position on the casing of the gun. The purpose of the longitudinal slot I'I will be explained hereinafter.

Suitable guiding means are provided on the casing I of the gun and on the trigger housing 8 for allowing longitudinal movement of the trigger housing along the casing I. In a preferred embodiment of the invention a so called cross guide is used for this purpose. Fig. 4 shows a guide of this type in cross section. The wall of the casing I is provided at one side with a rib I3 extending in the direction of the sliding movement. The other part of the guide on the trigger housing 8 is formed to embrace with its sections I4 and I5 both the wall of the casing I and its rib I3. In this way the gun casing is reinforced against bending stresses and deformation of its side walls and any lateral movement or yielding of the rear part of the gun, especially during firing operation and handling is positively avoided.

A pivot I6 is arranged at the front end ofthe trigger housing 8 (see Figs. 3 and 4).

I6 has iiattened parts I1 adapted for engagement with corresponding guiding slots I8 formed in the bearing 22 for the pivot I6. The bearing is connected or made integral with the casing I.

The rear part of the trigger housing 8 comprises a spring buffer I9 with a spring 20, see Fig, 5. When in operative position, the buffer abuts against projections 2| on the casing I. The buffer is further'shaped so as to co-act with the rear face of the breech block carrier 4.

The spring buffer servesthree purposes:

First, it absorbs the recoil shock of the of the barrel 2. The barrel 2 is connected with the casing I so that the recoil shock of the barrel is transmitted to the casing I and by the intermediary of the projections 2l to the buffer and spring 2D.

Second: being made to cooperate with the rear surface of the carrier 4 the bufferA is capable to absorb that part of the recoil shock of the carrier and the mechanism associated vwith it, which was not absorbed by the recoil spring I5. i

Third: The buifer I and spring 20 allow th shoulder piece I0 to yield upon -f an impact on the latter. In order to allowv this movementthe slot II for the locking bolt I2 is made longitudinal (Figs. 2 and 5).

To open the gun the locking member, such as the bolt I2, securing' the trigger housing with its associated parts to the casing of the gun, is

The pivoty released and the trigger housing 8 with the shoulder piece IQ, the trigger mechanism .1, the recoil spring 5, its guide 9 and the buffer and spring arrangement I9, 28, may be drawn back until the pivot I6 passes thev slot I8 and enters its bearing, and then turned downwardly around the pivot I6 and the shoulder piece ID set'on the ground. The gun supported at its iront end by a support or bipod 22 rests now at its rear end on the shoulder piece as an additional support or leg. The breech*A mechanism .can be then drawn back, as shown in Fig. 2a. 'Ihe fire arm is assembled in reverse sequence of operations.

unit with said trigger housing to serve as a second support, guiding means in said ring casing and on said trigger housing permitting limited longitudinal movement for securing the trigger housingv in position on said casing, a pivot pin in the trigger housing on which the rear part of the fire arm is swung, a bearing for said pivot pin arranged on said iring casing, guides for the pivot pin in said bearings, said pivot pin havingv flattened parts adapted for engagement With said guides on said bearing in the last stage of the backward movement of the rear part of the fire arm and guiding it after it has come out of engagement with the guiding means in the casing of the nre arm.

JOSEF DOBREMYSL.

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