FR2627267A2 - Connector for interchangeable firearm barrel - has screw attachment to existing barrel, with elongate push rod connecting existing hammer to firing pin of additional barrel - Google Patents

Abstract

The connector is screwed onto the mouth of the barrel of the gun (G). The body of the connector includes a striker (D) which is attached to an extension rod (H) which is slightly longer than the internal bore of the barrel. The hammer (I) of the firearm transmits its impact energy via the extension rod to the striker. The striker penetrates into the breech of the extension barrel (A) which is secured to the connector by a pair of semi-cylindrical locking sleeves (C). USE - Conversion of firearms for use of different calibres of ammunition.

Description

l
Extension relay for interchangeable multi-caliber guns.

The present invention relates to small arms and handguns having a percussion system developing sufficient energy to actuate a striker fixed at the end of an extension whose length is slightly greater than that of the barrel.

The device according to the invention is screwed at the end of the gun barrel provided to receive a sound moderator. Adequate threading can be carried out on weapons which do not have it
The objective of the invention is to use a low caliber and low performance weapon for firing higher caliber and more powerful ammunition using interchangeable guns at low cost.

The relay allows you to use any commercial ammunition or to create as long as the retraction of the equipped unleavened is not unpleasant.

The drawing of the relay on a 1/1 scale, Fig: 1 in section shows the entire system screwed onto the barrel of the carrier weapon (G). The breech (F) contains the striker (D) fixed at the end of its extension (H) which emerges from a few nm to the rear of the barrel (G). The dog (I) of the carrying weapon transmits its energy to the striker (D) by hammer effect on the rear of the extension. A pin (E) limits the rear stroke of the striker, stressed by its spring. The locking half-shells (C) are integral, one with the breech head, the other with the barrel support (A) or the barrels (Ki, K2, K3). A sleeve (B) sliding on the cylinder head body (F) keeps the latches (C) in the closed position.

Fig: 2 shows the simplicity of unlocking the breech barrel assembly. Fig: 3 shows a 14 mm caliber cannon in place in the barrel support (A). As a variant, Fig: 4 shows a 20 caliber cannon (K2) mounted without the intermediary of the barrel support (A) for simplification of Figs: 3 & 4 the sleeve (B) is not drawn. Fig: (5) shows the unlocked system with 44 mm caliber cannon, in this case a plate (J) increases the 8 of the breech head (F). This large caliber is useful for firing signaling projectiles, of artificial or liquid and flexible material intended for self-defense.

The barrel chamber outlet (K2) Fig: 4 shows in (L) a constriction of the borehole between two inverted cones. This device is particularly studied for shooting with very dispersive grids at short distance.

By analogy a fluid or a load of small pellets passing through our system (L in Fig: 4) located at the end of a pipe, will be projected in the shape of a very open cone. The efficiency of the system is proportional to the pressure / speed ratio. In a firearm this ratio gradually reverses with the advancement of the charge in the barrel, the maximum dispersion is obtained when the system is placed immediately after leaving the chamber. The gas pressure on the load is at maximum and the speed of the latter is at the start of its normal curve.

With a 20 gauge commercial hunting cartridge loaded with 24 grams of N08 pellets (1.75 mm) the dispersion at 5 meters covers a circle of t, 20 meters at 5 meters from the muzzle of our cannon (K2).

Claims (4)

 emerges from the back of the carrier barrel.  hammer effect relay striker at the end of the extension which  is screwed at the end of the barrel of a low power handgun or handgun. The relay contains a striker (D) integral with an extension (H) whose length is slightly greater than that of the carrier barrel. The carrier dog transmits its energy to the  claim 1 of the main patent characterized in that the relay  1- Relay associated with a gun holder or removable guns depending on 2- The relay according to claim 1 is characterized by a system realizing a direct barrel / breech locking, two semi-circular latches (C) integral, one of the barrel, the other of the breech head (F). The locked assembly is held in place using  a sleeve (B) sliding on the cylinder head body. 3- The relay according to claim 2 is characterized by a device making it possible to increase the head of the breech (F), this plate (J) is provided for guns of a caliber greater than 20. In this case, the cylinder head lock is secured to the plate (J). The system is suitable for firing ammunition of large diameter used for signaling, fireworks, launching of any projectile of smoke, gas or liquid composition. 4- The relay according to claim 2 & 3 is characterized in that it is  particularly suitable for mounting short barrels with drilling  double inverted cones, system (L) directly extending the chamber outlet. Under this essential condition, the device (L) has a maximum dispersing effect on the shot load of cartridges of common sizes used for hunting small game. The system (L) allows a distribution of the pellets in a circle of 1.2 meters b 5 meters apart.