GROOVE FOR COCKING THE FIRING PIN

Technical field

Subject of the invention is a cam mechanism for cocking the firing pin striking the primer of the gunpowder bullet, which may be used especially in devices driven by gunpowder gas energy.

Background art

Each device in which there is a firing pin primer striking mechanism needs a mechanism for cocking and releasing the pin. Traditional solutions based on reloading by means of lock movement - automatically or manually - as well as releasing with the trigger are not sufficiently susceptible to adaptation for remote control. The possibility of remote control of the pin is especially essential in the case of mobile robots for special uses and their accessories (tools) powered with the energy of gunpowder gas.

Disclosure of Invention

The aim of the invention is a simple pin cocking mechanism susceptible to remote control.

Mechanism according to the invention is equipped with a spring situated on the external surface of the firing pin, a revolving cam with a drive gear as well as a backstop mechanism the release of which initiates movement of the cocked firing pin. It is characterized in that it is equipped with a shaft crossing through the firing pin and leading through notches in the housing. One end of this shaft is located in a notch in the cam leading along a helix. The ends of this helical notch are connected with a linear notch parallel to the axis of revolution of the cam. The movement of the shaft, forced by the rotation of the cam, at the same time causes the retraction of the firing pin and straining of the spring until the pin is blocked in cocked position. The aforementioned backstop mechanism is part of the releasing and securing mechanism of the firing pin constituted by two levers coupled with each other by means of a toothed gear.

In one of variants the releasing and securing mechanism of the firing pin is equipped with an electromagnetic actuator.

Brief Description of Drawings

The subject of the invention in exemplary embodiment is presented on the drawing on which Fig.1 shows a longitudinal section of the cam mechanism, Fig.2 shows partial section of the backstop mechanism, while Fig.3 and Fig.4 show two different perspective views of the cam of the mechanism itself.

Mode for Carrying out Invention

A cam 2 with drive gear 3, advantageously cogged, is placed in housing 1 . The cam 2 is supported in bearing 4 secured by a plate 5 and by a bearing-protection plate 6. A shaft 7 is lead through housing 1 notches and passes through a hole in firing pin 8. One end of the shaft is located in the notch 9 of the cam 2. The notch 9 is led along a helix and the ends of this helical notch 9 are connected with a linear notch 10 parallel to the axis of revolution of the cam 2. During its rotation the cam 2 moves shaft 7 in the housing 1 notches. The shaft 7 is secured against falling out on the one side by the cam 2 and on the other side by a plate 1 1 screwed to the housing 1 with screws 12. As the shaft 7 passes the firing pin 8, its movement within the firing pin's 8 and cam's 2 plane causes a linear movement of the firing pin 8 to the back (cocking). During the cocking a spring 13 is sprained. After releasing it transfers its kinetic energy to the firing pin 8. The spring 13 is placed between bushings 14 and 15. Bushing 15 is secured by the plate 5 and remains immobile with regard to housing 1 . Bushing 14 moves along with the firing pin 8 in both directions, whereby in the direction of striking the firing pin there is the bushing 14 movement limiter mounted in the housing 1 . When the bushing 14 reaches this limiter, owing to inertia and the energy taken from the spring 13 the firing pin 8 moves further and after leaving the housing 1 it strikes the primer of the gunpowder bullet (not shown). The return of the firing pin 8 is realized by a spring 16 secured with regard to the firing pin 8 by a washer 17 and a stopper ring 18. The assembly of the springs 13 and 16 causes the firing pin 8 to remain inside the housing 1 in uncocked position. The cocking mechanism is equipped with a releasing and securing mechanism. Release of cocked firing pin 8, retained in this position by the shaft 7, is realized by means of backstop lever 19 bearing in the housing 1 with bearing bolts 20. Push electromagnet 21 serves to release the firing pin 8. Return of the backstop lever 19 and its locking on the shaft 7 is caused by spring tappet 22. A securing lever 23 coupled with the backstop lever 19 by means of a toothed gear serves to secure the firing pin 8 against unwanted movement in the direction of the bullet's primer and an unintended shot. When the backstop lever 19 is in a closed position the securing lever 23 limits the firing pin 8 movement by means of blocking the movement of shaft 7 in housing 1 in the direction of the bullet's primer.