DE19900043C1 - Muzzle loading air rifle - Google Patents

Abstract

The simulated percussion air rifle has a cold gas chamber in the rear of the barrel containing a firing valve and having a firing sleeve block forming the rear of the chamber. The sleeve has an inlet for the gas, a guide bore for the piston rod and an outer thread at its rear for the sparking cylinder.

Description

In the context relevant here are known:

• - both historical and replicated percussion rifles with black powder drive and spark ignition
• - historical as well as replicated wind boxes from the 16th / 17th / 18th Century
• - conventional air / CO ₂ weapons for sport or hunting small game. These are usually characterized by small calibers (4.5-6.35 mm), various forms of drive (spring pressure / compressed air / CO2 / pre-compressed air, etc.), different shot release mechanisms and are suitable for short distances.
• - Airborne operations available in some foreign markets bene long guns of larger caliber in rifle or shotgun shape

Hence there are percussion rifles with powder drive today as well numerous forms of cold gas-powered weapons, as such were conceived and which "cold shot release mechanisms" are common. Furthermore, a rifle is known from US Pat. No. 5,706,598 can be seen using an adapter as a front-loading rifle is possible to use. Muzzle-loading percussion rifles with cold gas propulsion of the form described above are m. W. not known.

The invention specified in patent claim 1 is based on the problem of being able to provide the numerous muzzle-loading enthusiasts with a historically largely authentic percussion rifle of greater caliber that fires accurately over longer distances (50-100 m), but without dealing with the legal and actual problems of the To confront use of black powder:

• - Explosive permit is required, the powder layer Private households are not without their dangers
• - Noise and pollution problems
• - Given the considerable risk of explosion and fire (rightly) hardly any shooting ranges for black powder in some areas (counties) none only one.
• - High achievable projectile energies with gunpowder fen also require special from this point of view Shooting ranges.

These problems are described by the claim 1 solved characteristics of the cold gas powered percussion weapon.

For the percussion shooter who uses the invention, the mentioned difficulties eliminated or mitigated. A location Highly explosive powder in private homes is no longer an option required. The noise level in the vicinity of the shooting range decreases.  

If dimensioning according to the execution Game used below can be scored with a view Projectile energy every shooting range approved for small arms are used, especially since there is an explosion or fire hazard as in the case le of black powder is completely eliminated. Pollution from Gun and environment due to black powder residues belongs to the Ver past. The "original" shooting feeling - often as Perceived counterpoint to the modern world - still remains Given the continued use of a commercial (co most affordable) percussion weapon is an acceptable market price of the Expected subject of the invention. In addition, arise for Air is low compared to black powder Operating cost.

An advantageous embodiment of the invention is described in claim 2. By exchangeability of the ignition cylinder, it is sufficient that the valve opening mechanism can be operated both "hot" and "cold". This has the advantage that

• - The remaining contamination of the ignition cylinder can optionally be avoided by primers.
• - any remaining fire hazard can be excluded.
• - Optionally, the costs of primers are also eliminated.

In contrast to the historical or replicated large caliber However, due to the design principle, the wind box remains (cf. embodiment) the advantage of a precisely dimensionable Charge with constant gas pressure and thus the shotgun received accuracy.

Embodiment and explanation with reference to FIGS. 1-4

The goals of the construction were largely unrelated changed the use of a commercially available percussion rifle res, the maintenance of the primer, against one the construction principles of historical wind boxes (short-term Valve opening by the action of high spring force against the full Reservoir internal pressure) improved cold gas drive and in one generally simple construction.

Therefore, it was about making the dimensions of the components the usual Adjust dimensions of a standard muzzle loader barrel (Diameter about 25 mm), the shaft change to a minimum reduce (a hole for cold gas supply), the valve opening by using the contained in commercially available primers to enable usable energy of approx. 5 joules and therefore to design the valve in such a way that the lowest possible Force to open against the internal chamber pressure is required and yet a secure locking behavior is guaranteed.  

An embodiment of the invention is shown in the drawings and is described in more detail below.

Show it

Fig. 1: Overview

Fig. 2: cuts

Fig. 3: ignition cylinder "cold"

Fig. 4 .: Variations in cold gas supply (not part of the patent claims)

Overview ( Fig. 1)

The bore of the original barrel ( 2 ) of a percussion rifle is enlarged in the rear part to a length of approx. 100-120 mm to a diameter of approx. 17 mm and provided with threads for the firing valve screw ( 3 ) and breech block ( 16 ). In this way, the cold gas chamber ( 6 ) including the shot valve ( 3 , 4 , 5 , 7 ) is integrated into the barrel. The remaining wall thicknesses should be selected so that a maximum expected internal pressure of 200 bar can also be exceeded by 100% for safety reasons.

Alternatively, the cold gas chamber and shot veins can be accommodated til easily realized in a separate component. That would be him is enough that in addition to the shaft, lock and trigger mechanism the run can remain unchanged.

The closure piece ( 16 ) replaces the original tail screw. It essentially contains the inlet channel ( 10 ) for the cold gas supply ( 14 ), a bore ( 11 ) for gastight guidance of the movable valve rod ( 7 ), the tapered continuation of this bore as a guide for the piston rod ( 15 ), which actuated manually Gas inlet valve ( 13 ), a threaded hole for the pressure relief valve ( 12 ) or optionally a pressure gauge and the cold gas supply ( 14 ) for connection to various reservoirs (see. Fig. 4). The valve rod displacement ( 11 ) connects a safety bore with a small cross-section to the outside world, so that in the event of defective valve rod seals ( 9 ), a safe dissipation of the excess pressure into the surroundings is ensured.

The subsequent ignition cylinder ( 23 ), like the ignition piston ( 22 ), piston rod ( 15 ) and ignition cylinder seal ( 18 ), preferably consists of a corrosion-resistant steel, since the combustion chamber ( 19 ) absorbs the combustion residues from the primers. On the side opposite the piston base ( 20 ) there is a screw, not shown in the drawing, for connecting a cleaning hose, with the aid of which flushing / cleaning of the combustion chamber can be carried out after firing approximately 100 primers. At greater intervals (1000 primers), more thorough cleaning is required when the ignition cylinder is removed. The seals ( 17 , 21 ) meet high temperature requirements.

The cock triggered by the trigger and lock mechanism ignites a primer placed on the piston. Due to the moderately enlarged piston bore in the combustion chamber ( 19 ) there is a brief overpressure, which is sufficient in the dimensioning used here to open the piston, piston rod and thus the shot valve and keep it open until it contains in the chamber ( 6 ) t has completely escaped. This applies to a pressure range up to 200 bar. Crucial for the function is that only a force is required for the shot valve opening, the gas pressure on the difference in the cross-sectional areas of the shot valve seal ( 3 ) and shot valve rod ( 7 ) and the counterforce of the return spring ( 8 ) overcomes. The return spring finally closes the shot valve.

Cuts ( Fig. 2)

Inlet and pressure relief valve are in succession at the inlet channel arranged. Manual operation of the intake valve has proven in combination with pressure relief valve or pressure gauge inexpensive, because when using narrow bores (security, low flow) and fine thread pitches of the shoot pressure must be adjusted sensitively and precisely. On a (complex) external compressed air pressure regulator can therefore be omitted if necessary be tested. This is true when using an overpressure vein tils a certain loss of gas, but in view of the low The cost of the blowing agent does not matter. Teflon has become remaining as the cheapest material for the sealing washers used proven.

Ignition cylinder "cold" ( Fig. 3)

The "cold" variant, which is identical in its outer dimensions with the "hot" ignition cylinder ( Fig. 1/23), contains a simple facial expression consisting of a firing pawl ( 32 ) and connecting rod ( 34 ) in addition to a slightly modified piston rod ( 15 ). The existing standard piston ( 33 ) with relief bore to the outside serves as a counter bearing for the tap of the percussion lock. If desired, a primer can also be put on here, which, however, ignites as a placebo.

The cock triggered by the trigger and lock mechanism pushes the firing pawl ( 32 ) forward with its lower part, moves the piston rod ( 15 ) backwards and thus opens the firing valve (cf. Fig. 1) by about 3 mm for the dimensions selected here . The shot valve remains open until the cock is tensioned again and the return spring ( Fig. 1/8) closes the valve. From a safety point of view, this is a cheap solution, since refilling (loading) the cold gas chamber ( Fig. 1/6) is only possible with the cock cocked.

Claims (2)

1. front-loading percussion rifle for cold gas drive, characterized in that
that the cold gas chamber ( 6 ) with a shot valve ( 3 , 4 , 5 , 7 ) is integrated in the rear part of the original barrel ( 2 ),
that the cold gas chamber is delimited to the rear by a sealing piece ( 16 ) screwed into the barrel,
that the closure piece with the inlet channel ( 10 ) for the cold gas supply ( 14 ), a guide bore for the piston rod GE ( 15 ) and on the back with an external thread for an ignition cylinder ( 23 ), and
that an ignition piston is arranged in the ignition cylinder ( 23 ), which actuates the firing valve ( 3 , 4 , 5 , 7 ) when the primer is ignited via the piston rod ( 15 ). 2. front-loading percussion rifle for cold gas drive, characterized in that
that the cold gas chamber ( 6 ) with a shot valve ( 3 , 4 , 5 , 7 ) is integrated in the rear part of the original barrel ( 2 ),
that the cold gas chamber is delimited to the rear by a sealing piece ( 16 ) screwed into the barrel,
that the closure piece with the inlet channel ( 10 ) for the cold gas supply ( 14 ), a guide bore for the piston rod GE ( 15 ) and on the back with an external thread for an ignition cylinder ( 23 ), and
that in the ignition cylinder ( 23 ) a shot release pawl ( 32 ) is mounted, which is pushed forward by a trigger triggered by the trigger and lock mechanism ( 31 ) and thereby moves the piston rod ( 15 ) to the rear and thus the shot valve ( 3 , 4 , 5 , 7 ) opens.