US2539275A

US2539275A - Forward damper device for firearms with a recoil mantle

Info

Publication number: US2539275A
Application number: US25486A
Authority: US
Inventors: Sahlin Borje; Aslund Ivan; Nyqvist Halvar
Original assignee: Bofors AB
Current assignee: Saab Bofors AB
Priority date: 1945-09-22
Filing date: 1948-05-06
Publication date: 1951-01-23
Anticipated expiration: 1968-01-23

Description

Jan. 23, 1951 B. SAHLIN EI'AL FORWARD DAMPER DEVICE FOR FIREARMS WITH A RECOIL MANTLE 2 Sheets-Sheet 1 Filed May 6, 1948 )N\( E NTO RS Edv m fmanudluwsson Decmstu qym, Ex'ecufor l A a V riiM ATTY'S WITH A RECOIL MANTLE Filed May 6, 1948 2 Sheets-Sheet 2 6 117/012 17/4 4 l (I //7 I Patented Jan. 23, 1951 FORWARD DAMPER, DEVICE Fort FIREARMS WITH A RECOIL MANTLE Borje Sahlin, Stockholm, Ivan z lslund, Karlskoga, Sweden, and Edvin Emanuel Jansson, deceased, late of Bofo'rs, by Halvar Nyqvist, executor,

Bofors, Sweden,

Bofors, Bofors, Sweden of Sweden assignors to Aktiebolaget a joint-stock company Application May s, 1948, Serial No. 25,486 In Sweden September 22, 1945 2 Claims. (01. 89-44) The present invention refers to a device for elimination of shocks of short duration which occur, with firearms mounted on trunnions or the like, having a recoil mantle, and especially with such ones having back throwing or accelerating means for the breech lock, which shocks appear between the trunnions and the recoil mantle, when the release member begins to function in order to prevent such shocks to transfer to the gun carriage.

According to the invention a spring device which may be provided with a damper arrangement, is arranged between the trunnions and the recoil mantle.

The invention is illustrated with an embodiment in the attached drawing, where Fig. 1 is a perspective view, some parts being partially cut away to show some of the parts in elevation and some in section of a firearm with a device according to the invention. Fig. 2 is a detail section on a big scale. Fig. 3 is a section along the line IIIIII in Fig. 2.

In the drawings l indicates the barrel, displacably mounted on an elevation trunnion ring 2, which, by means of the trunnions 3 is swingably mounted on a gun carriageinot shown). The barrel is partially enclosed in a recoil mantle 4. Between the barrel and the recoil mantle, a recoil spring 29 is tensioned. On the front of the recoil mantle 4, an outer muif 5 is screwed, the

fore end of which is provided with an inwardly directed annular flange 6 with slanty or conical annular surfaces. The mufi 5 is at the bottom secured by means of a set screw 8. Screwed to the elevation trunnion ring 2, and secured by a stop screw 9, is the foreend of an inner muiT Iii, havin a ground bushing II, which encloses a guide surface l2 on the barrel I. The inner muff I8 is at its rear end provided with an outwardly directed, annular flange l3, with slanty or conical surfaces I4. Between the conical surface 1 of the outer muff 5 and the cylindrical outside surface l5 of the inner muff, lil buffeting members are placed, having slanty or conical surfaces, in this case a pair of conical brake-ring halves l6, and between the inner cylindrical surface ll of the outer muff 5, and the conical surface 54 of the inner muff ill, buifeting members are also placed, in this case a pair of conical brake-ring halves l8. Between the brake-ring halves H5 and the brake-ring halves 8 a staple of seven Bellecompresses the recoil spring 20; which is pressing back the recoil mantle 4 somewhat in comparison with the elevation trunnion ring 2. Said movement of the recoil mantle 4 is allowed against the strain of the Belleville springs"!!! and the brake-ring halves i6 and I8 respectively, of which A the first named are compressed and the last named are pressed apart on account of the wedgelike action of the conical surfaces. Through this is eliminated the effect of the shocks of short duration that otherwise would jar the trunnion "rings, and thereby the gun carriage.

thereto; a plurality of trunnions extending from said trunnion ring and serving to support said gun from a gun carriage; a recoil mantle, spaced 'irom, and surrounding said barrel, said recoil mantle terminating at a point along said barrel which is spaced from said trunnion ring; and recoil absorbing means positioned between said recoil mantle and said trunnion ring, said recoil absorbing means including a staple of Belleville springs between said recoil mantle and said trunnion ring, surrounding said barrel, and secondary shock absorbing means against which the ends of said Belleville springs labut.

2. A gun provided with recoil damper mechanism positioned so as to prevent the transmission of recoil shocks to the supporting gun carriage,

which comprises, in combination: a barrel; a trunnion ring surrounding said barrel and secured thereto; a plurality of trunnions extending from said trunnion ring and serving to support said gun from a gun carriage; a recoil mantle, spaced from, and surrounding said barrel, said recoil mantle terminating at a point along said barrel which is spaced from said trunnion ring; and recoil absorbing means positioned between said recoil mantle and said trunnion ring, said recoil absorbing means including a staple of Belleville springs positioned between s'aid recoil mantle and said trunnion ring, said staple of Belleville springs surrounding said barrel, and a pairof split rings against which the ends of said Belleville springs abut, said split rings being positioned between said recoil mantle and an extended portion of said trunnion ring, and being wedge-shaped in radial cross-section whereby, under the influence of re- REFERENCES CITED The following references are of record in the file of this patent:

Number Number 4 UNITED STATES PATENTS Name Date Lauber Sept. 2, 1902 Browning Feb. 13, 1906 Kreissig Nov. 11, 1924 Sutter et a1. Feb. v8, 1938 Bell et al. Mar} 6, 1945 Bell et a1 Feb. 19, 1946 FOREIGN PATENTS Country Date Germany Aug. 28, 1940