US2331347A

US2331347A - Firearm

Info

Publication number: US2331347A
Application number: US266976A
Authority: US
Inventors: Rehnberg Per Harry Erik
Original assignee: SNABB AV AR 1938 AB
Current assignee: SNABB AV AR 1938 AB
Priority date: 1938-04-23
Filing date: 1939-04-10
Publication date: 1943-10-12
Anticipated expiration: 1960-10-12
Also published as: CH211953A; FR839799A; GB524891A; FR49928E

Description

GCL 12, 1943- P. H. E.`REHNBERG FIRE ARM Filed April l0, 1959 2 Sheets-Shree?I 1 y gg@ .i 3:5155.1555554551 Il. l 541441554551441.. 551554545, 95144445? Z 'llnlllr N. hm SN dvfm gr. 0r-rj EHK Rehnbefrg ML 9M ATTY,

Oct. 12, 1943.

P.v H. E. REHNBERG FIRE ARM Filed April 10, .1959

2 Sheets-Sheet 2 nu l l r l l n l l 1 l 1 l e 1 u 1 1 l 1 K-hnberg lNvENToE 9m ATTY.

Patented Oct. 12, 1943 FIREARM Per Harry Erik Rehnb'erg, Enskede, Sweden, as-

signor to Aktiebolaget Snabb Av r 1938, Stockholm, Sweden, a joint-stock company of Sweden Application April 10, 1939, Serial No. 266,976 In Sweden April Z3, 1938 4 Claims.

The present invention relates to improvements in those semi-automatic or wholly automatic iire arms. One object of the invention is to produce an automatic riiie or the like, in which a -gas nozzle is mounted slidably on the free end of the barrel in such a manner that the bullet, after having left the barrel, has to traverse only a very short distance within the gas nozzle.

A further object of the invention is to provide an automatic tire arm in which -the elements which serve to reciprocate the breach block mechanism and their associated springs are mounted in a compact manner within one another...

A still further object of the invention is to provide an automatic iire arm in which the breech block driving mechanism is of simple construction and consists of a limited number of sturdy elements which oier a lhigh resistance to wear and tear.

Still another object of the invention is to produce an automatic iire arm vwith a breech block driving mechanism, the parts of which-can be easily dismounted, cleaned and exchanged.

According to the invention, these and other objects are accomplished by the arrangement and combination of parts set forth in the following detailed description, dened in the appendedV claims and illustratively exemplified in the accompanying drawings, in which:

Figs. 1 and la are to be taken as a single figure and'constitute a longitudinal section through a rifle, according to the invention, with the movable parts in the position they assume immediately after firing.

Figs, 2 and 2a, taken together, are a similar longitudinal section through the rifle with the movable parts in their rear end position, and

Fig. 3 is a longitudinal section through the rear portion, of a modified embodiment.

In the drawings, the numeral l indicates the tie stock on which is mounted the breech mem,- ber 2 with the barrel 3. the said barrel being as usual provided with backsight 4 and foresight 5. Around the free end of the barrel 3 is mounted a hollow cylindrical nozzle 6, into the front end of which there is screwed an end piece 8 provided with a central opening 1. The muzzle of the barrel 3 is conically bored. To the underside of the nozzle 6 is welded a U-shaped sleeve 9 which by means of a bayonet-joint 9a is connected with a cylindrical member l which is open at the top of its front portion. A rack l2 having teeth Il is secured to the nozzle within the sleeve 9. The rack I2 is arranged resiliently in such a way that its rear end i3 is urged somewhat away from the nozzle 6. However, this fend i3 is wedge-shaped and enters, in its rear position, a cam groove H in a bearing l secured to the barrel. Surroundingthe cylindrical member I0 and resting with one 'end on a ring 'I6 secured to the member Il! and with the other end of the bearing l5 there is mounted a helical lspring I1 which is arranged as a pressure spring. A spindle i8 which extends through the cylindrical member l0 and yis guided for slidable movement therein, is provided at its front end with teeth ls which cooperate with the teeth H on the rack l2. At its rear end the cylindrical member I0 is provided with a nut 20 cooperating with a buffer a which reduces the shock when the nozzle 6 is flungforward. Within the member I0 and resting against the nut 20 and va guide shoulder 2| on the spindle I8 there is provided another helical spring 22 arranged as the 'magazine 26, and are at their rear end detachably connected with a reciprocable breech block mechanism of any known type. A suitable breech block mechanism is described, for instance, in the British Patent No. 131,350.

The construction of the breech block mechanism does not form part of the present invention, but, for the sake of completeness, its principal elements may be brieiiy outlined as follows: The rear ends of the rails 25 are connected with an approximately semi-cylindrical member 2l. In said member is provided a screw thread 28 which is engaged by a'correspondingly screw threaded projection 30 on the rear p0rtion of the breech block 29. The breech block is provided with lugs 3l in the usual way in Mauser rifles, said lugs cooperating with lugs 32 in the breech member 2. The lugs 3l are provided with projecting iingers 33 which serve to withdraw the cartridge shell from the breech member. The block 29 may be actuated by means of a knob 34, the arm 35 of which has been shortened a little and curved to the right side of the rifle. The striker with lug is indicated by 3G. The striker glides on a guide rail 31, which is elongated backward in order to be stable. The striker 36 cooperates with a corresponding lug 40 located on the sear lever shown in Figs. 1 and 1a. The cartridge shell 43 still lies in the iiring position. The nozzle 6 has been pressed forward by the gases behind the bullet, and the teeth II of the rack I2 have-engaged the teeth I9 on the spindle I8. During this procedure the spring II has been compressed and now tends to move the cylindrical member IIl and the elements connected 'therewith backward. However, in order to open the bolt 28 it is necessary to turn the same, and, as the pin 4I is still in the recess 42 and prevents this turn- .ing, the elements will remain in their positions until the trigger 38 has been released. When this has taken place, the semi-cylindrical part 21 is pressed backward by the rails 25. At the beginning of this movement the screw threaded projection 30 on the block 29 will glide in the screw thread 28 and thus `turn the block a quarterv of afrevclution in order to release the lugs 3I. At continued pressure of the spring I'I the breech block 2S will be withdrawn to the position shown in Fig. 2, the empty cartridgeshell being thrown out in the usual manner. However, at the end of the rearward stroke of the nozzle, the end I3 of the resilient rack I2 Venters the cam groove I4 in the bearing I5,

whereby the teeth II ,are lifted oi the teeth I9 of spindle I8. Spindle I8 is thus released and continues to move rearwardly a short distance.

The spring 22, which has been previously compressed, now presses the breech block 29 forward again. During this procedure a loaded cartridge M is introduced in a known way to the iring position and the breech block is locked again in its inner position. The engagement of the end I3 of the rod I2 in the cam groove I4 allows the teeth I9 to pass forwardly of the teeth I I. 'Ihe elements now reassume the position shown in Fig. 1 except the nozzle 5, the elements rigidly connected with the same, the trigger 38, the lever .39 and the striker which assume the positions shown in Fig. 2. When the trigger 38 has been pressed backward again the new cartridge introduced to the iiring position is fired and the process is repeated.

In order to make the gun still more safe, there may be provided a protective cap above the rear part of the breech block and extending to the end of the path of movement of the breech block, as shown in Fig, 3.

When a protective cap is used it is not necessary to retain the breech block in its rear position, and therefore the members intended herefor may be omitted. Moreover, by a simple change of the firing mechanism the gun may be made wholly automatic or wholly and semiautomatic.

It is evident that the device may be varied in many respects within the scope of the invention.

Having now described by invention, what I claim as new and desire to secure by Letters Patent is:

1. In an automatic re arm, the combination with a barrel, having a conically bored muzzle, and a reciprocable breech block mechanism, of a 4through said iirst element and gas nozzle slidable on and surrounding the free end of the barrel, said nozzle including a. from; wall provided with a central opening in register with the barrel bore, said front wall, in the rear end position of said nozzle, being disposed directly adjacent said muzzle, a rst elongated element slidable along said barrel and rigid with said nozzle, a spring acting on said barrel and first element, respectively, to urge the latter into its rearmost position, a second elongated element mounted for longitudinal movement periodically slidable in unison with and relative to said first element, a latch arranged for longitudinal movement with one of said elements, said latch projecting yieldingly into the path of the other element, means on said other element for cooperation with said latch to lock the two elements together during the rearward stroke of the nozzle while allowing independent longitudinal movement of the iirst element during the forward stroke of the nozzle, means connecting the rear end of said second element with said breech block mechanism, means on said barrel to disengage said latch from said cooperating means at the end of the rearward stroke of the nozzle, and spring means between the rst and second elements to displace said second element in forward direction independently of said iirst element when said latch has been disengaged from said cooperating means."

2. In an automatic re arm, the combination with a barrel, having a conically bored muzzle, and a reciprocable breech block mechanism, of a gas nozzle slidable on and surrounding the free end of the barrel, said nozzle including a front Wall provided with a central opening in register with the barrel bore, said front wall, in the rear end position of said nozzle, being disposed directly adjacent said muzzle, a rst elongated element comprising a hollow cylindrical member slidable along said barrel and rigid with said nozzle, a pressure coil spring surrounding said cylindrical member and acting on said member and on the barrel, respectively, to urge the nozzle into its rearmost position, a second elongated element comprising a spindle slidably guided in said cylindrical member, a pressure coil spring surrounding said spindle within said cylindrical member and acting on said two elements to urge said spindle forward relative to said cylindrical member, a latch arranged for longitudinal movement with one of said elongated elements, said latchprojecting yiedingly into the path of the other elongated element, means on said other element for cooperation with said latch to lock the two elements together during the rearward stroke of the nozzle while allowing independent longitudinal movement of the cylindrical member and nozzle during the forward stroke of the latter, means connecting the rear end of said spindle with said breech block mechanism, and means on said barrel to disengage said latch from said cooperating means at the end of the rearward stroke of the nozzle.

3. An automatic iire arm, as claimed in claim 2, in which said latch is arranged for movement with said cylindrical member and comprises a resilient rack having at its free rear end a toothed portion and a wedge-shaped thorn, said cooperating means including a corresponding rack portion on said spindle, and saidlatch disengaging means including a bearing provided with a cam groove into which said thorn of the resilient rack enters at the end of the rearward stroke of the nozzle to disengage the toothed portion of the resilient rack from the rack portion of the spindle.

4. In an automatic re arm, the combination with a barrel, and a reciprocable breech block mechanism, of an elongated hollow element slidable longitudinally along said barrel, said rst element having a nozzle in line with the free end of the barrel, a spring acting on said barrel and said rst element respectively to urge the latter into its rearmost position, a second elongated element mounted for longitudinal movement through said first element and periodically slidable in unison with and relative to said first element, a latch carried on said first named element and projecting yieldingly into the path of the second element, means on said second element for cooperation with said latch t lock the two elements together during the rearward stroke of the first named element while allowing independent longitudinal movement of the first element during the forward stroke of the latter, means connecting said second element with said breech block mechanism, means to disengage said latch from said cooperating means at the end of the rearward stroke of the rst element, and spring means between the first and second elements compressible during rearward movement of said second element for displacing the second element in forward direction independently of said rst element when the latch has been disengaged.

PER HARRY ERIK REHNBERG.