IL25507A

IL25507A - Sound absorbers for fire arms

Info

Publication number: IL25507A
Application number: IL25507A
Authority: IL
Original assignee: Walther C
Priority date: 1965-05-14
Filing date: 1966-03-31
Publication date: 1970-12-24
Also published as: CH445337A; DE1279508B; US3385164A; BE679438A

Description

SOUND ABSORBERS FOR FIRE ARMS The invention concerns a sound absorber for firearms, which consists of a sleeve adapted to be set onto the front end of the barrel of the firing weapon, the muzzle of the barrel projecting into the interior of the sleeve through the rear end wall of the latter, its front end wall having an op¾eing for the exit of the projectile and the gases propelling it, and in which the interior of the sleeve is subdivided into individual chambers by partition walls having openings for the passage of the projectile.

Sound absorbers fo fire arms have already become known in various embodiments. In one of the known devices, the sleeve set onto the muzzle of the barrel has a larger chamber faoing the latter, to which are joined towards the front end of the sleeve a number of smaller chambers, which are made by means of partition walls. It has been shown, that a sound absorber constructed in this manner does not attain the desired sound absorption during the delivery of a charge. Although there is a noticeable sound absorption of the muzzle report, yet this is still so loud, that this kind of known sound absorber has not been able to perform in practice. Furthermore, a sound absorber for fire arms has become known, in which the interior of the sleeve is subdivided by means of conical partition walls into single sa^ll chambers, which, however, are all connected with a larger chamber annularly surrounding them. Although a certain absorption of the muzzle report is obtained also with this sound absorber, the performance of such an auxiliary device is not satisfactory.

In order to avoid the disadvantages of the constructions of the sound absorbers known up to now, and in order to provide ./. such a sound absorber in which the muzzle report of the fire weapon is lowered to an intensity of sound which is very low and is not consciously realized from a short distance, there is suggested according to the invention, to subdivide the interior of the sleeve of the sound absorber into three or more chambers, wherein a pipe for the passage of the projectile extends through the second chamber behind the muzzle of the barrel and openings for the passage of the gas are provided in the partition wall between the first and the second chamber, inwardly the openings being tapered/from the first ohamber towards the second chamber.

After the exit of the projectile from the barrel, the first chamber is first filled with the gases which have propelled the projectile from the barrel. The gases expand as much as possible in this first chamber. While the projectile passes through the pipe extending through the second ohamber, the gases contained in the first chamber expand into the second chamber through the opening passages in the partition wall.

Only when the projectile hurries through the third and the following chambers, can the gases reach the third and following chambers from the first ohamber and can thereby expand. As a result of the passages in the partition wall to the first chamber whioh passages taper towards the second chamber, the gases from the second chamber can only stream back into the first chamber in a strongly throttled condition and can then follow the passage of the other gases. The seoond ohamber acts thus as a storage ohamber for part of the gases. Its size depends substantially on the amount of gas, respectively gas pressures, which are set up in the sound absorber.

The passage openings in the partition wall between the first and the second ohamber can advantageously be inclined or can consist of slanted slits, which are so arranged that the gases led into the second ohamber receive a spin, in order to obtain an eddying and a destruction of energy.

In the third chaaber, i.e. behind the second ohamber of the storage chamber, inserts with conical partition walls and a central opening for the passage of the projectile are preferably provided for the subdivision of this chamber into several small individual chambers. It is expedient to construct, respectively reduce the wall surfaces of the conical partitions in a step-wise manner on one or both sides, whereby an advantageous breaking up of the sound waves is obtained .

Further details, especially of constructional kind, will become clear fron the description hereinafter of an especially preferred embodiment of the subject of the invention, which is shown in ^igs. 1 to 4. There is shown in : ¾g. 1 a longitudinal section of a sound absorber according to the invention in a schematic view; Fig. 2 a longitudinal section of a sound absorber with the same basic construction as the sound absorber aocording to Fig. 1; Fig. 3 is a plan view of the partition wall between the first and second chamber; Fig. 4 is a longitudinal section of an insert for the third chamber for subdivision into smaller individual chambers.

The principal construction of the sound absorber for fire arms according to the invention can be seen from Fig. 1. The sound absorber consists of a sleeve 11 with a rear wall 12 having an opening 13 into which is set the front end of the barrel 14 of a firing weapon. A partition wall 15 is located in the sleeve between the first chamber 16 facing the nuzzle of the barrel 14 and the second chamber 17 lying towards the front fend. chamber 17 is closed off at its other side against the third chamber 19 by the partition wall 18· In the partition wall between the first chamber 16 and the second chamber 17 openings 20 for the passage of the gas are provided which openings taper towards the second chamber 17· '.Through the entire length of the second ehamber 17a pipe 21 extends, so that the gas from the first chamber 16, respectively, from the ehamber 17 can only reach the third chamber 19 through the pipe 21· The front or third chamber 19 is subdivided by several, preferably conical partition walls 22 into a corresponding number of smaller chambers 19a, 19b, 19c. The partition walls 22 are provided with a short piece 23 of pipe directed towards the nuzzle of the barrel for the passage of the projectile and the gases* The third chamber 19 is closed by the front end wall 24 in which the opening 25 for the exit of the projectile and the gases is disposed. A nozzle-shaped piece 26 of pipe is preferably inserted into this opening.

The openings in the partition wall 15 between the first chamber 16 and the second chamber 17 for the passage of the gas can, if desired, as seen from Fig. 3$ consist also of slits 31, which are radially worked into a plate 32 and are Constructed with a slant in such a manner, that a spin is imparted by means of the slits 31 to the gases flowing into the second chamber 17.

In a practical embodiment of a sound absorber, the sleeve is formed of one piece 41 of pipe in the rear end of which a thiok-walled disk 42 is inserted for a closure.

The sound absorber is screwed with the tapped hole 43 in the disk 42 onto the thread 44 at the front end of the barrel 45 of a firing weapon. The insert 46 is slid from the rear side into the sleeve 41, the insert forming the seoond chamber 48 following the first chamber 47 from the direction of the muzzle of the barrel. The insert 46 consists of a central piece 49 of pipe, at each of the two ends of which a disk 50, respectively 51» is set, by which the three chambers lying behind each other are subdivided.

Slits 52 of the a ove-mentioned kind for the passage of (vide Pig. 3) the gas/are disposed in the disk 51· The disk 50, which forms the front end wall of the second chamber 48, lies, for example, against a bead 53 in the wall of the sleeve 41. A supporting sleeve 54 in the first chamber 47 serves for fixing the insert 46 in place, the supporting sleeve bearing on the one hand against the disk, respectively partition wall 51» sad on the other hand against the rear closure disk 42. Preferably several similar inserts 56 are slid from the front opening of the sleeve 41 into the front, respectively third chamber 55» the last insert faoing the muzzle of the barrel bearing against a bead 57 of the sleeve 41. The inserts consist of a short piece 58 of pipe lying against the inner wall of the sleeve 41, a conical wall pieoe 59 which is preferably reduced stepwise, joining the end of piece 58 facing the barrel 45, the wall piece merging into a piece 60 of pipe having an opening for the passage of the projectile · The rearmost inserts 5 facing the muzzle of the barrel support each other, so that they are axially fixed. The foremost insert is held by the front plate 61 set into the front end of the sleeve. The nozzle-shaped opening 62 for the passage of the projectile is disposed in the front plate, the rear part 63 of the opening being preferably step-shaped.

The inserts 5 , can be punched and stamped from thin-walled material, as can be seen from Fig. 2. It is also possible, however, to manufacture an insert 71 from a solid piece by turning. The inside 72 of the conical wall 73 is reduced step-wise, in order to provide for a better breaking up of the sound waves. The outer wall 74 can be smooth or can be also step-wise reduced, finally, the inserts can be made also of conical wound spring wire material. It oan possibly be of advantage, to provide pressure compensating holes in the sleeve and especially in the range of the first ohamber behind ¾ the muzzle of the barrel. These are advantageous above all when the sound absorber is to be used for automatic weapons.

Gases dammed through a quick rate of firing esoape through these holes, without however, increasing the intensity of the sound. iSverything contained in the description and respectively, shown in the drawing, belongs to the invention, including that which is obvious for the man skilled in the art as a variation of the concrete embodiments.

HAVING NOW particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is :-

Claims

1. Sound absorber for fire arms, consisting of a sleeve adapted to be set onto the front end of the barrel, the muzzle of the barrel projecting into the interior of the sleeve through the rear end wall of the latter, its front end wall having an opening for the exit of the projectile and the gases propelling it, in which the interior of the sleeve is subdivided into individual chambers by partition walls having openings for the passage of the projectile, characterized in that the interior of the sleeve is subdivided into three or more chambers, wherein a pi e for the passage of the projectile is passed through the second chamber behind the muzzle of the barrel and openings for the passage of the gas are provided in the partition wall between the first and the second chamber, inwardly the openings being tapered/ from the first chamber towards the second chamber.

2. · Sound absorber as claimed in claim 1, characterized in between the second and an that in/the third, asd¾=??espeotiv¾¾F or/ a further chamber, g-ref ecakl¾r=:ffiore two inserts with conical partition walls having opening for the passage of the projectile are provided subdividing the chamber,

3. Sound absorber as claimed in claim 2, characterized in that the conical inserts are provided with a piece of pipe facing the muzzle of the barrel for the passage of the projectile.

4. J. Sound absorber as olaimed in claim 2 or 3, characterized in that the surfaces of the conical inserts facing the exit opening of the end wall of the sleeve are reduced step-wise.

5. Sound absorber as claimed in claim 4, characterized in that also the surfaces of the conical inserts facing the muzzle of the barrel are reduced step-wise.

6. Sound absorber as claimed in one of theuclaims 1 to 5, characterized in that all or one part of the tapered openings for the passage of the gas in the wall between the first and second chamber are inclined towards the axis of the chamber in such a manner that a spin is imparted to the gases passing therethrough.

7. · Sound absorber as claimed in one or more of claims 1 to 6, characterized in that a piece of pipe, the inner wall of which is nozzle-shaped and through which the projectile is adapted to pass, is arranged near the outer wall of the sleeve.

8. Sound absorber as claimed in claim 7, characterized in that the rear part of the inner wall of said piece of pipe is reduced stepwise.

9. Sound absorber as claimed in one or more of claims 1 to 8, substantially as described and, respectively or illustrated. Agent for Applicants