WO1998038467A1

WO1998038467A1 - Trigger mechanism

Info

Publication number: WO1998038467A1
Application number: PCT/BG1998/000007
Authority: WO
Inventors: Victor Stoyanov Staev
Original assignee: Varbanov, Ivailo Youlianov; Aprachamyan, Rafi Garo
Priority date: 1997-02-25
Filing date: 1998-02-24
Publication date: 1998-09-03
Also published as: BG62906B1; BG101260A

Abstract

The present invention relates to a trigger mechanism, which may be applied in the construction of small weapons, especially in gas pistols. It provides a possibility for both semi-automatic and automatic mode of operation. It has a simple construction and is reliable during long-term operation. The trigger mechanism consists of a traction lever (5), one end of which being hinged to a trigger (1), and the other end being in contact with the long arm of each of a pair of L-shaped levers (6 and 7). Two restrain bars (9, 10) rest on the short arms of the levers (6, 7), the bars being subjected to spring force and they engage in the cocked position a shoulder formed at the rear end of a striker (14). A fire selector switch (18) located below the traction lever (5) cooperates with a disconnecting pin located above the traction lever (5) and acting on a tapered part thereof.

Description

TRIGGER MECHANISM

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a trigger mechanism, which may be easily installed in small weapons, especially in gas pistols. It provides a possibility for both semiautomatic and automatic mode of operation.

BACKGROUND OF THE INVENTION

There are known different kinds of weapon systems, the speeds of firing of which depend mainly on the construction uf the trigger mechanism.

Bulgarian patent application Reg. rδ 93781 discloses a gas pistol, which includes a trigger to which one of the ends of a firing plunger under spring force is hinged. The lower part of a hinged semi-automatic restrain bar rests at the other end of the firing plunger. The upper part of the hinged semiautomatic restrain bar is in contact with a slot formed on the outer surface of a firing hammer under spring force and is supported by a spring fixed in the housing. The lower part of the breech is provided with a latch, contacting one of the tinds of an automatic restrain bar. The latch of the latter is directed towards the slot of the hammer. The semi-automatic and the automatic restrain bars are mounted on one axle. The lower part of the automatic restrain bar and the upper part of the se i-automatic restrain bar are supported by one sp ing.

The above described trigger mechanism has a limited application in the constructions of the small weapons based on the principle "movable breech block".

Taking into con ideration the above stated the object of the invention is to provide a trigger mechanism which may be applied also to different constructions of small weapons providing at the same time the possibility for both automatic and semi-automatic fire.

SUMMARY OF THE INVENTION

The present invention relates to a trigger mechanism which can be used in small weapons based on the principle "movable breech block" providing the possibility for both automatic and semi-automatic fire.

The trigger mechanism includes a trigger to which a traction lever is hinged, the rear end of which is in contact with d restrain bar mounted on an axle. Also mounted on the axle is a second restrain bar leaning against a supporting element formed in the rear part of the breech. A changer is mounted bellow the restrain bar, and above the bevelled part of the restrain bar there is a disconnecting pin. According to the invention the connection between the traction lever and the restrain bars is implemented by a pair of L-shaped levers mounted on a same axle. One of the sides of each restrain bar is in contact with the short arm of the

L-shaped levers, and the other side leans against a supporting element, which is in the rear end of a striker. In the breech there is a latch, which is in contact with the long arm of the L-shaped lever.

According to one aspect of the invention the restrain bars are in the form of trapezium, where one of the inclined sides rests on the short arm of the L-shaped lever. The other inclined side of the trapezium leans against the supporting element of the striker.

The proposed trigger mechanism has many advantages. It can be applied in different constructions of small weapons, especially in gas pistols, which construction is based on the principle "movable breech block". The trigger mechanism allows different kinds of operation - one shot, semiautomatic or automatic mode. The invention has a simple construction and is reliable during operation.

BRIEF DESCRIPTION OF THE DRAWINGS

An embodiment of the invention is described in detail with reference to the accompanying drawings in which:

FIG. 1 is a partial cross-section view of the pistol with a trigger mechanism in cocked position in semi-automatic mode !.r operation;

FIG. 2 is a partial cross-section view of the pistol with a tr igger mecha ism in cocked posi ion in automatic mode of ope tion .

EXAMPLARY EMBODIMENT OF THE INVENTION An exemplary embodiment of the trigger mechanism subject- matter of the invention is presented in the description, which does not limit the application of the proposed trigger mechanism in other types of fire weapons.

The trigger mechanism according to the present invention includes a trigger 1, placed in the body of a pistol between a barrel 2 and a handle 3. One of the ends of a traction lever 5 is hinged via an axle 4 to the trigger 1 and the other end presses the long arm of a pair of L-shaped levers 5 and 7, mounted on one axle S. Two restrain bars 9 and 10, hinged to an axle 11, rest on the short arms of the levers 6 and 7 and are supported by sp ings 12 and 13, respecti ely. The restrain bars 3 and 10 are in the form of trapezium with their longer inclined sides resting on the short arms of the Itsvers 6 and 7. The shorter inclined side of the trapezium- shaped restrain bar 3 is clutched in a step-shaped support formed at the rear end of a striker 14. A striker spring 15 is placed behind the striker 14, and the front end of the striker 14 enters a breech 16 placed axial ly in the barrel 2. A spring 17 is placed at the handle 3 onto a pin. One of the ends of the spring 17 presses against the lower surface of the traction lever 5 and the other end leans against the body of the handle 3. Under the traction lever 5 a changer 18 is placed and above it there is a disconnecting pin 19.

OPERATION OF THE TRIGGER MECHANISM The trigger mechanism described allows for two modes of shooting - semi-automatic and automatic, which will be described as follows:

Operation in se i-aitomatic mode:

The pistol is made ready to fire according to the following consequent steps: the breech 16 is pulled to a ful y retracted position, pressing the spring 15 of the striker 14. Thus the tapered expansion formed in the rear- part of the striker 14 presses against the pair of restrain bars 3 and 10. This causes the compression of the springs 12 and 13 and the restrain bars 9 and 10 start to rotate around the axle 11 which is the same for both restrain bars 3 and 10. After the striker 14 passes the rear ends of the restrain bars 9 and 10, the latter move "upwards" under the force of the respective springs 12 and 13 and thus get engaged with the striker 14.

When releasing the breech 16, the latter moves "upwards" under the force of its reflexive spring, engages a cartridge from the charger (not shown in the figures) and pushes it into the chuck of the barrel 2. A little before its setting in the front end position the latch formed in the rear end of the breech 16 presses the L-shaped lever 7 and rotates it. At this position the restrain bar 10 starts to rotate and releases the striker 14, which remains in a rear end position, held by the restrain bar 9. The pistol is ready to fire in this position. When pushing the trigger 1, it compresses its spring and moves the traction lever 5, whose motion is determined by the position of the disconnecting pin 19 and the pressing "upwards" of the traction lever 5 by one of the arms of the spring 17. The rear end of the traction lever 5 acts on the left L-shaped lever 6, rotating it around the axle 8. This causes also the rotation of the restrain bar 9. As a result the striker 14 is released and with its forward motion strikes the blasting cap of the cartridge.

At the same time, in its movement "backwards" the traction lever 5 leans with its tapered end against the isconnecting pin 19, causing the lever 5 to rotate around i s axle 4 and to get released from its contact with the L- shaped lever 6. Under the action of springs the levers return to their initial position. At this time the breech 16 has moved back and the restrain bars 9 and 10 hold the striker 14 HI a t ϋur end position.

In order to fire another shot it is necessary to release the trigger 1, and under the force of its spring it moves back to a front position and contacts the lever 5. When pushing the trigger 1 again, the described interaction between the elements is repeated for firing another shot.

Operation in automatic mode:

All actions before pushing a cartridge into the barrel 2 are repeated, and the striker 14 is in a rear position. The changer 18 rotates to a position where the sol id section is positioned under the traction lever 5, thus preventing the possibility of its rotating around its axis.

When pushing the trigger 1 the traction lever 5 rotates the lever 6 and the restrain bar 9. Thus the striker 14 releases, moves forward and makes a shot. The breech 16 returns and ejects the fired cartridge and catches a new cartridge from the charger. At the moment of entirely placing the cartridge in the barrel 2 the lever 10 rotates under the motion of the latch formed in the breech 16, and the restrain bar 10 rotates and releases the striker 14. The above described interaction between the elements is repeated until the trigger 1 is pressed or until all the cartridges in the charger are fired.

Claims

PATENT CLAIMS

1. A trigger mechanism comprising a trigger to which a traction lever is hinged, the rear end of which is in contact with a restrain bar mounted on an axle, where a second restrain bar is mounted and leans against a supporting element formed in the rear part of the breech, where a changer is mounted bellow the traction lever, and above the tapered part of the traction lever there is a disconnecting pin, characterized in that the connection between the traction lever (5) and the restrain bars (9, 10) is implemented by a pair of L-shaped levers (6, 7) mounted on one axle (8), and one of the sides of each restrain bars (9, 10) is in contact with the short arm of the L-shaped levers (6, 7), and the other side leans against a supporting element, which is at the rear end of a striker (14), and where in the breech (16) there is a latch contacting with the long arm of the L-shaped lever (7).

2. A trigger mechanism according to claim 1, characterized in that the restrain bars (9, 10) are in the form of trapezium, one of the inclined sides of which rests ╧àii the short arm of the L-shaped lever (6), and the other- inclined side of the trapezium rests on the supporting element of the striker (14).