US1634754A - Gun barrel - Google Patents

Description

Patented July 5, 1927.

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NICOLAS EMILIEN METHLIN, OFY PARIS, FRANCE, ASSIGNOR TO SCHNEIDER & GIE.,` 0F PARIS, FRANCE, A. LIMITED JOINT-STOCK COMPANY.

GUN BARREL.

Application inea october 25, 1926, serial No. 144,067, and ijn France January 14, 192e.

. The present invention relates to agun b arv` rel adapted to be taken down or dismounted, comprising a acket forming a breech sleeve at its back part and a tiring. tube encased at its back part in the said jacket.

According to the invention the thickness of the tiring tube, its external diameter and the nature or state of the metal of which it is composed are chosen in such a way that when the gun barrel is mounted a clearance is left between. the back part of the tube and the interior oiv the jacket which is taken up each time a shot is fired inV order that the jacket will assist the gun barrel in withstanding the transverse stresses set up, the

said clearance re-appearing automatically,

however, after the projectile has lett the gun, thus enabling a worn tiring tube to be easily removed and replaced by a new tube.

In order that the jacket will take part in withstanding the transverse stresses set up in the gun barrel during firing, that is to say, in order that the assembling clearance will disappear momentarily while re-appearing automatically subsequently when the deforming. force due to the pressure of the gases has ceased to act,a metal having a higher elastic limit than the meta-l of the jacket. may be chosen for the tiring tube.

The jacket and the firing tube may also beV both. made of the same steel and the steel of the tiring. tube have a higher elastic limit imparted to it by a suitable treatment.

The. removable tiring tube may also be made of a metal having,.in desired cases, an elastic. limit lower than that of the metal forming the jacket. In this case it will be necessary to.- subject the tube, in a preliminary operation, before the machining of the tube, to al treatment which. raises the elastic limit of thev outer layers of the tube, mak.

ing it higher than the elastic limit of the inner layers of the jacket. This eiiect may be obtained by subjecting the tiring tube, before machining, to a. self hooping. operation.

Several embodiments oi the present inven* tion are disclosed in the accompanying drawings wherein like reference characters refer to likeparts throughout the several views. It will be understood, however, that the drawings are for purposes of illustration only and are not designed as a definition of the limits of the invention, reference being had to the appended claims .for this purpose.

` In the drawings, Figs. 1 'and la constitute a longitudinal sectional view of one embodiment ot the invention. Figs.` 2,. 2 and 3 are similar views illustratinn other embodiments..

In the exampleshown in longitudinal section-al elevation in Figure 1 the ytiring tube A inserted from the front in the jacketrB with a clearance D is screwthreaded lata for itsassembly with the jacket which is provided with aYV corresponding female thread This thread is ot' the opposite hand to the riding ofthe tube. Y A

The rear end ot' thetube lis turned down ,at al to form` a shoulder a2V by meansA of which the tube" presses upon an abutment b1 formed upon vthe jacket. Y

As the screwed joint .and the riiing have opposite handed threads no unscrewing of the tube can take pla-ce during firing; moreover, the tube is always made to abut against the. shouldergin the jacket by the screwing action, which the reaction due to the rotationot` the projectile in the tube tends to produce in the desireddirection.

In the modiiication shown in longitudinal sectional elevation in Figure 2. a shoulder is formed at a3 by a thickening of the firing tube A, which shoulderv abutsY against the front tace b2 of the jacket B. In this eX- ample the turned down portion is dispensed with in the back part of the tube, thusV al- ,lowing a tube of less thickness to be em-V means of a sleeve .E having an internal thread and adapted to screw on to a screw# threadI end B? of the jacket. In this eX- ample the iront/face of the jacket abuts against a collar A1 on the tiring tube, which collar in its turn abuts against a shoulder e Having now particularly described and ascertained the nature ot my said invention and in what manner the same is to heupenV formed, I deelarethat what I claim is l. A gun comprising a ritledl ring tube and a jacket, the rear end of said tube eX- tending into said jacket and having theV outer diameter ot the rear portion thereof less than the inner diameter of the jacket, and 4 screwthreaded means forY removably securing said iiring tube to said jacket, the threads ot said means being formed inv a direction opposite to the ritiing of the tube and being provided .adjacent the front end ot the jacket whereby said firing tub-e is readily removable from the acketV which assists in withstanding the transverse stresses set up in the rear portion of said tube during tiring ot the gun.

2. A gun comprising a rifled tiring tube and a jacket provided with screw threads adjacent thev torwardend thereof, the rear end ot said tube extending into said jacket and being provided with'means to engage said threads, the latter being formed in a `direction opposite to the ritling of the tube, the outer diameter ot the rear portion ot the tube being less than the inner diameter of the jacket which is adapted Yto confine the rear end ot the tube within its elastic limits under stress of lire while leaving play'between the tube and jacket when relieved ot such stress, whereby said'tube is'readily removable trom said jacket. Y

3. A gun comprising a riiledY iiring vtube and a jacket having a threaded portion, the rear end or" said tube extending into the jacketand having an outer diameter nor mally less than the vinner diameter ot the jacket, and threaded means for the tube adapted to engage the threads ot the jacket for maintaining said jacket and tuberin cooperative relation, said threads being formed in a direction opposite to the riiling ot the tube.

' 4. A gun comprising a rifled tiring tube and a'jacket having threads adjacent the forward end thereof, the rear end ot said tube extending into the jacket and provided with threads formed in an opposite direction to the ritling of the tube for coaction with the threads of the jacket, the outer diameter of the rear portion of the tube being less than `the inner diameter ot the jacket and having a tensile strength ,such that the jacket assists in withstanding the transverse stresses set up in the tube at the instant ot iring, said tube being provided with a shoulder adapted to abutv against a portion of the jacket, the reaction resulting from the rotation otV a projectile passing through the tube serving to torce said shoulder more tightly into engagement with the jacket. i 5. A gun ot the type comprising inner and outer portions', 'the inner diameter ot the outer portion and the'outer diameter of the inner portion being such that the outer portion coniines the inner portion within its elastic limit under tiring stresses while leaving play between'saidinner and outer portions vwhen relieved ot ssaid stresses, said in ner and outer portions being provided with coacting threads and the inner portion being rifled, the ritling and threads beingso formed that the reaction resulting from the passage ot a projectile through theinner portion tends to move the latter inwardly relative to the outer portion. j 6. A gun comprising an inner rifled portion and an outer portion, a shoulder on one ot said portions having abutting engagey ment with the other portion, threaded means .for securing said portions 1n cooperative relation, the threads ot said means being cut ina direction oppositeto the rifling whereby the reaction resulting from the rotation of a projectile passing through the inner portion acts through said threads and forces said shoulder more closely into `engagement with the abutting portion.

7 A gun comprising, incombination, a jacket and a ritled tiring tube having the rear portion thereof extending within the bore of the jacket, said tube being provided with Vmeans adapted to engage threads formed in the forward portion ot said jacket, saidV threads being formed in a direction opposite to the riiiing ot said ring tube, the outer diameter ot the rear portion ot the part ot the tube extending rearwardly from the plane ot the threads ot the jacket being lessvthan theinner diameter of the jacket, and .said diameters being so proportioned that the jacket'conlines said tube within `its elastic limits und-er the stress of firing while leaving play between the tube and jacket when relieved ot ysuch stress, whereby said tube is rendered easily removable.

8. A gun ot thetype described compris ing, in combination, a jacket anda ried iiring tube extending into -said jacket, said tube being provided with a shoulder adapted to engage the end of said jacket, and the latter being provided with a sleeve surroundving said tube and adapted to engage said shoulder and the threads ot said jacket ttor preventing longitudinal displacement of the tube and jacket.

9. VA Agun comprising, in combination, a jacket, a rifled firing tube extending into said jacket and provided with a shoulder adapted to engage the jacket, screw threads formed in the jacket adjacent the forward 130 end thereof for coacting with said tube to maintain the latter in operative relation with the jacket, said screw threads being formed in a direction opposite to the rifling of the tube, and the inner portion of said tube being confined within said acket within its elastic limits under the stress of liring and being so constructed that play is left between the tube and jacket when the former is relieved of said stress, whereby 10 said tube is rendered easily removable.

In testimony whereof I have Signed this specification.

NICOLAS EMILIEN METHLIN.

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