FR2659135A1 - Improvements to striking devices on portable (light) weapons with a breech bolt of the rifle type - Google Patents

Abstract

Improvements made to the striker devices on weapons with a breech bolt, of the rifle type, and according to which a device which tends to reduce the arming force whilst maintaining strong uniform striking at high speed and free of vibrations is used. It includes the following embodiments, taken separately or in combination: a): A ball or needle thrust bearing 8 facilitating the rotation of the breech upon arming. b): A roller 10 avoiding friction of the firing trigger 3 on the arming cam 4. c): Throwing of the striker (needle) or striking mass 1 carried out by a stack of elastic washers 7 providing a great amount of energy with minimum precompression.

Description

 The present invention relates to the improvements made to percussion devices on portable latch weapons, of the rifle type.

 It is known that in portable weapons, the firing of the propellant charge, as soon as the shooter has actuated the trigger mechanism, is effected by means of the trigger of a spring system and by the action of a striker which comes to strike a detonating primer.

The usual means used to reduce the action time of this percussion mechanism are imitated:
Lightness of the striking mass
Reduction of the striker stroke
Reinforcement of the main spring '
The three means are interdependent: rapid percussion requires a light striker, reduced stroke and a powerful spring.

The forces necessary for arming quickly exceed the physical capacities of the shooter, and the forces produced, as well as the vibrations generated on mechanical elements of reduced dimensions weaken them.

 The present invention aims to minimize the arming efforts, while allowing a sufficient spring force to ensure a frank and vibration-free strike of a light striker and reduced stroke.

 Models of cylinder head locks are provided with one where several helical cams ensuring the opening of the lock tensioning of the percussion spring. The spring rests on the one hand on the rear part of the lock where on its part on the other hand, it exerts pressure on the striker giving it its impact energy.

 At the opening, the rotation of the lock causes: -On one side, a friction of the spring support piece, locked in rotation, against the lock body where its rear closure piece, which have a rotation equal to the angle required for unlocking.

-On the other, 1! 1 arming element which slides with friction on the where the cams which is fitted with the rotary element of the lock, which causes another friction.

 These two friction sources generate significant forces on opening, amplified by the initial tension that a helical spring of initial compression must undergo sufficient to ensure percussion.

 Seon'invention, es frictions are significantly reduced by: -mounting a spring device allowing a reduced initial tension -interposing on the one hand a rotating roller on the armament -on the other hand a thrust ball where needles in point spring support.

 The invention can be applied to new mechanisms as well as to existing mechanisms. For the latter, adaptation parts can be provided by the manufacturer.

 The description which follows with reference to the accompanying drawings, given by way of non-limiting example, will make it clear how the invention can be implemented. The particularities which emerge both from the drawing and from the text which, of course, form part of said invention.

 Figure 1 is an elevational view of a percussion device of the cassique type, striker in the armed position.

 Figure 2 is a diagram of a percussion device improved by the present invention, striker in the firing position.

 Figure 3 shows the cocking cam for a typical cylinder head lock.

 In diagram l, the percussion device 1 is driven by a spring 2 whose initial compression is very strong; the trigger 3 slides with friction against the ramp of the cocking cam 4, and the thrust piece 5 is in direct support on the bottom 6 of the breech.

 In the improved device shown in diagram 2, the classic coil spring is replaced by spring washers 7 commonly called Belleville, without initial compression. When cocking, each elastic washer in the stack is only subjected to low compression, therefore reduced deformation and constant pressure. The ball bearing or needle 8, centered by the plug 9 is supported on the pressure piece 5 and allows the free rotation of the cylinder head to open, when s' effect the arming effort of the striker. The trigger 3 is provided with a roller 10 resting in rotation on the arming cam 4.

Two liongitudinal flats 11 located under the roller 10 on the trigger allow it to slide back and forth in a groove of the mechanism body, while another transverse flat serves as a catch notch for the weapon.

 FIG. 3 shows an example of a tee cocking cam that is machined in the lock body.

 It goes without saying that modifications can be made to the embodiments which have just been described, in particular by substitution of equivalent technical means, without going beyond the ambit of the present invention.

Claims (1)

 10: Percussion device, in particular for bolt action rifles characterized in that, in order to reduce percussion time, effort and vibrations, it uses, separately or in combination, spring washers (7); in that the trigger (3 ) is provided with a roller (10); in that there is provided a thrust ball or roller (8).  20: Device according to claim 10 characterized in that the stop (8) is centered on the plug (6) and resting on the pressure piece (5).  30: Device according to one of the preceding claims characterized in that the trigger (3) is provided with a roller where roul'ement (10).