Semi-automatic pistol with a sliding barrel

1. A semi-automatic pistol comprising:

a frame, wherein a barrel is arranged in said frame and a firing chamber of which is associated with a receiving cavity for receiving a cartridge, said receiving cavity being provided with a downwards opening to communicate with a magazine, and with a side ejection port associated with a mechanism for extracting and ejecting a case after shooting; and

a firing mechanism comprising a striker mounted so that said striker can pivot in a rear portion of the pistol and suitable to initiate firing the cartridge inside the firing chamber, and a trigger integral with an actuating arm which acts on a means for arming and retaining the striker in an armed position, wherein the barrel is mounted in an axially slidable manner between a forward position to which said barrel is driven by friction of a bullet when firing the cartridge, and a recoiled position to which said barrel is pushed by a recoil spring until reloading a new cartridge, said means for arming and retaining the striker comprising a link which at a back end thereof is connected to the striker by means of an articulation and which is operated by means of a lever pivotably mounted inside the frame, said lever having a top end operated by the barrel during movement of said barrel to said forward position in order to pivot said lever, and a bottom end forming a cam that acts on said link during pivoting of said lever, pushing said lever back so as to rearm the striker.

2. The semi-automatic pistol according to claim 1 , wherein the barrel acts on said top end of said lever by means of a projection provided at aback end of said lever hitting against said lever such that said lever is pivoted forward.

3. The semi-automatic pistol according to claim 1 , wherein said link is provided with an L-shaped guiding slot, wherein a large side of said slot extends horizontally and a small side of said slot extends vertically upwards, a guiding pin incorporated in the frame extending inside said L-shaped guiding slot such that said guiding pin allows the link to carry out a translatory motion towards the back for arming the striker while at the same time said link is subjected to action of a spring that downwardly bias said link such that said guiding pin is housed inside said small side so as to retain said link in an armed position of the striker.

4. The semi-automatic pistol according to claim 3 , wherein said link can be released from said armed position by means of a nose which forms a cam provided at a back end of the actuating arm and which is suitable for abutting on an underside against the link to push said link upwards.

5. The semi-automatic pistol according to claim 1 , wherein said actuating arm incorporates an elastic member which projects upwards and during pivoting thereof abuts against a lug provided on said link such that together said lug and said elastic member form a flexible stop.

6. The semi-automatic pistol according to claim 5 , wherein said elastic member is a wire spring.

7. The semi-automatic pistol according to claim 1 , wherein a rear wall of the receiving cavity for receiving the cartridge is provided with a hole centered on the firing chamber and which allows the striker to strike the cartridge inside the firing chamber directly through said hole.

8. The semi-automatic pistol according to claim 7 , wherein a striking end of the striker has an overall conical shape complementary to an inner shape of said hole.

9. The semi-automatic pistol according to claim 1 , wherein the barrel slides inside a cylindrical gap formed inside the frame being guided by a collar provided in a periphery of the barrel and by an end part with a central guiding bore arranged in a front end of the pistol.

10. The semi-automatic pistol according to claim 9 , wherein the recoil spring is a helicoidal spring arranged inside an annular interstice formed between said cylindrical gap and the barrel, being supported on said collar of the barrel on one side and on said end part on another side.

11. The semi-automatic pistol according to claim 1 , wherein the mechanism for extracting and ejecting the case after shooting comprises an ejector plate arranged opposite the ejection port and one end of said ejector plate is connected to the barrel and another end of said ejector plate has an elastic loop that extends radially and is suitable for being compressed by the cartridge as the cartridge moves up into the receiving cavity for receiving the cartridge.

12. The semi-automatic pistol according to claim 11 , wherein the ejector plate has at least one longitudinal guiding slot that receives a guiding pin so as to limit axial movement of said ejector plate to an extraction position.

13. The semi-automatic pistol according to claim 1 , wherein in order to center the cartridge as the cartridge moves up into the receiving cavity, a rear wall of said cavity is provided with a first lug arranged so as to form an upper abutment, and with a second lug arranged so as to form a side abutment.

14. The semi-automatic pistol according to claim 13 , wherein said second lug is provided with a projection suitable for being placed behind a ridge of the cartridge so as to form a member for extracting the case after shooting.

15. The semi-automatic pistol according to claim 1 , wherein the magazine is closed at a top end thereof by a rotary closure member having a shape of a stirrup two parallel sides of which are shown to be pivoting on the top end of the magazine.

16. The semi-automatic pistol according to claim 15 , wherein one side of the stirrup incorporates a leg directed downwards to penetrate a guiding slot provided at the top end of the magazine, and said leg is suitable for cooperating with an elastic member provided inside the gap for receiving the magazine for pivoting the rotary closure member to an open position.

17. The semi-automatic pistol according to claim 1 , wherein an abutment member in a form of a shaft is mounted such that said shaft slides upwards and downwards to project into the receiving cavity when said shaft is in an upper position, such that said shaft prevents the barrel from returning to said recoiled position so that the ejection port is kept open towards the receiving cavity.

18. The semi-automatic pistol according to claim 17 , wherein the shaft forming said abutment member is arranged in front of the magazine and said shaft comprises a hook at a top end of said shaft, said hook projecting into a slot of the magazine to cooperate with a raising plate for raising cartridges in order to move the shaft upwards after shooting a last cartridge inside the magazine.