WO1994015164A1

WO1994015164A1 - A guide and damper for recoil sound

Info

Publication number: WO1994015164A1
Application number: PCT/FI1992/000352
Authority: WO
Inventors: Seppo Taneli Konkola
Original assignee: Seppo Taneli Konkola
Priority date: 1992-12-21
Filing date: 1992-12-21
Publication date: 1994-07-07

Abstract

A recoil damper connectable to a guntube of a firearm which is formed of a tube-like part, which has holes (5) drilled through cylinder and directed to the inner hole (D1) of the cylinder. The adjacent holes locating on the periphery of the body (1) intersect each other before the inner hole (D1) of the recoil damper.

Description

A GUIDE AND DAMPER FOR RECOIL SOUND

The invention relates to a recoil damper and to a damper for recoil sound which damper is connectable to firearms guntube. The damper is cylindrical and equipped with holes drilled through the cylinder-

According to the US patent 4,945,812 it is previously known a recoil damper, which has hole lines round cylindrical body, which holes are locating in a plane perpendicular in relation to the inner hole of the damper. The adjacent holes of the hole line are locating near each other so that the sides of the holes intersect each other already before the inner hole essentially at a point intermediate the wall thickness. The successive hole lines are on the other hand so far from each other that ring-like grooves are formed on the inner surface of the cylinder at their place, the grooves having indefinite bottom form. That kind of successive ring-like innerside locating grooves are so far from each other that between them on the inner surface of the cylinder are remaining ring-like unbroken surfaces between grooves.

By means of the hole assembly according to the invention a different groove structure can be made on the inner surface of the damper that is why motions of gases, crashs against each other and the edge surfaces of the damper are decreasing the recoil and causing production of static ionization in the gases that is utilized by guiding through the holes coming ionized gases forward via sound guiding cup as a gas assa which has same direction as the guntube. When the gases have mixed with air and whirls have become steady, the muzzle detonation happens about 1,5 - 2 metres at the front of the guntube depending on the caliber of the firearm.

Characteristic for the invention is that the hole lines being in the plane perpendicular in relation to inner hole are locating by the side near each other so that the sides of the successive holes intersect each other, too before the inner hole. In this case there are not formed in the inner surface of the cylinder successive ring-like grooves separated by the unbroken intermediate surfaces but the groove network crossing on the inner surface.

In the following the invention is explained more closely by referring drawing, where

Fig. 1 is a side sectional view of a recoil damper. Fig. 2 is a crossectional view of a hole line of a damper. Fig. 3 is a sectional view of a damper where is presented only the network form of the inner surface.

In Fig. 1 is a recoil damper which is fastened on the guntube of a firearm by means of thread 4 which is presented in a sectional view likewise about one hole line of the cylindrical part 1 is presented in a sectional view. At the rear end of the body 1 a recoil sound damper 2 has been fastened, which comprises of a cylidrical part 9, which is opening forward. The recoil damper 1 has been equipped with holes 5. The holes 5 can be varied of their diameters and different sizes can be found at the front and rear ends of the damper. Hole diameters and density and the wall thickness d of the cylindrical part of the recoil damper has been elected so that on the periphery locating adjacent holes 5 intersect each other before the inner hole Dl of the damper as shown in the sectional view Fig. 2 A-A. The successive hole lines 6 and 7 locate near each other and they are located alternating side by side. That is causing that the holes in lines 6 and 7 mutual are intersecting each other before the inner hole Dl. One hole 5 in the damper is hereby intersecting four other adjacent holes 5. Some of the holes 5 can be drilled inclinedly forward or backward drilled. The diameter and lenght of the sound damper part 2 can be varied depending on the types of the firearm or bead.

In Fig. 2 the cylinder part 1 has been sectioned perpendicular to the longitudinal axle of the firearm at the point of the first hole line from the firearm side. The adjacent holes seen in thiε section intersect each other before the inner surface of the damper. The ring-like groove is then formed at the point of this hole line, which is broken the inner surface of the damper and is rotating round the inner surface of the damper. The same is happening in the damper according to US-patent 4,945,812.

In Fig. 3 the damper 1 is sectioned so that the inner surface can be seen. The holes haven't been shown for clearness. Instead of that it is shown what kind of grooves 10 are formed on the inner surface of the damper. There are formed thus crossing grooves 10 on the inner surface and in the triangles 11 between grooves is remaining a little surface unbroken inner surface of the damper. The produced grooves are indefinite of their depth and breadth but their directions are determined according to the locations of the holes. In Fig. 3 the points of the hole centres on the inner surface marked as points 8. These are the groove crossings at the same time.

The invention is not restricted to concern only the presented embodyment but many variations are possible in the scope of the inventive idea defined in the patent claims.

Claims

1. A recoil damper connectable to a guntube of a firearm which is formed of a tube-like part, which has hole lineε (6), (7) in successive planes round the periphery of the cylinder (1) which planes locating perpendicular in relation to the inner hole (Dl) and holes (5) have been directed tow¬ ards the inner hole (Dl) and the adjacent holes locating on the periphery of the body (1) intersect each other before the inner hole (Dl) of the recoil damper c h a r a c t e r ¬ i z e d in that the successively locating hole lines (6), (7) locate side by side when in the same circle position of the cylinder (1) is alternating hole (5) and between holes (5) locating intermediate surface.

2. A recoil damper according to claim 1 c h a r a c t e r ¬ i z e d in that side by side adjacent each other locating holes intersect each other before the inner hole (Dl).

3. A recoil damper according to claim l or 2 c h a r a c t ¬ e r i z e d in that there are holes of different sizes in the successive hole lines (6) or (7).

4. A recoil damper according to claim l or 2 c h a r a c t ¬ e r i z e d in that the end of the recoil damper locatinq in the firearm side comprises of on the body (1) surface mounted cylindrical part (2,9) for guiding and damping of the recoil sound which part is at least partly conically forward wideninq.