Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F41—WEAPONS
  • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
  • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
  • F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
  • F41A19/42—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer
  • F41A19/43—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in bolt-action guns
  • F41A19/47—Cocking mechanisms
  • F41A19/48—Double-action mechanisms, i.e. the cocking being effected during the first part of the trigger pull movement
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F41—WEAPONS
  • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
  • F41A17/00—Safety arrangements, e.g. safeties
  • F41A17/64—Firing-pin safeties, i.e. means for preventing movement of slidably- mounted strikers
  • F41A17/72—Firing-pin safeties, i.e. means for preventing movement of slidably- mounted strikers trigger-operated, i.e. the movement of the trigger bringing a firing-pin safety into inoperative position during the firing

Definitions

• the present invention relates to double-action trigger mechanism for semi-automatic pistol.
• the trigger mechanism of pistols having single-arm draw bar operates in many cases in the single action mode (e.g. as it is with the CZ 75 ST or CZ 75 M pistols) .
• Disadvantage of some double-action trigger mechanisms with single-arm draw bar is usually high trigger pull weight and inconsistent operation, resulting from passive resistance in the course of transfer of forces .
• double- action trigger mechanisms comprising single-side bar which when the trigger blade is squeezed is driven forward in the direction of fire.
• Disadvantage of these versions is often already mentioned higher trigger pull weight and at the same time its relative complexity and comparatively expensive production of used parts and components .
• double action trigger mechanism the draw bar is arranged for engagement with the hammer lever during pull of the trigger in the course of the hammer cocking from its front position against the force of the main spring.
• double action trigger mechanism includes roller, rotatable around fixed axis for rolling engagement with functional surface created on the draw bar at the final stage of the hammer cocking for the change of draw bar position in such a manner that it is released from its engagement with the lever and thus the hammer is tripped and under the force of the main spring strikes against the primer.
• the double-action trigger mechanism includes the sear for intercepting the hammer after its cocking automatically following the fire by movement of the slide towards the shooter or after retracting the hammer manually for the first shot using hammer's head serrated surface.
• the drawbar is adapted for engagement with the sear after the hammer interception for the hammer release and its striking under the force of the main spring against the primer.
• Intended invention objective is to eliminate to the maximum aforesaid shortcomings being inherent in the existing double action trigger mechanisms, which objective is achieved by utilizing single-arm draw bar controlled by the trigger, which allows double action of the serai-automatic pistol and is guided by the roller and which is pushed for the reason of the trigger pull weight reduction in the direction towards the shooter, further by the new design of the ejector having more functions, by new design of the trigger pin fixation.
• the design of the trigger mechanism according to the present invention is advantageous in that the parts and components used are, compared to parts and components of known semi-automatic pistols having double action trigger mechanism, simplified and restricted to parts of spindle character, stamped parts, or parts made by sintering under high temperatures and pressure into mould, without any requirements for further surface treatment.
• Fig. 1 illustrates broken-out section of the semi-automatic pistol with the trigger mechanism in the condition when the hammer is being cocked from its front - initial position
• Fig. 2 is a broken-out section of the semi-automatic pistol with the trigger mechanism in the condition of the final stage of release of the hammer being cocked from its front - initial position
• Fig. 3 is a broken-out section of the semi-automatic pistol with the trigger mechanism in the condition, where the hammer is cocked and intercepted by the sear
• Fig. 1 illustrates broken-out section of the semi-automatic pistol with the trigger mechanism in the condition when the hammer is being cocked from its front - initial position
• Fig. 2 is a broken-out section of the semi-automatic pistol with the trigger mechanism in the condition of the final stage of release of the hammer being cocked from its front - initial position
• Fig. 3 is a broken-out section of the semi-automatic pistol with the
• Fig. 4 is a broken-out section of the semi-automatic pistol with the trigger mechanism in the condition of the final stage of the hammer release from its cocked position;
• Fig. 5 is a broken- out section of the semi-automatic handgun with the trigger mechanism in the condition after a cartridge discharge, and
• Fig. 6 is an exploded view of the frame (in broken-out section) of the semi-automatic pistol, part of the slide and part of the trigger mechanism in disassembled condition.
• pin 2 with pivotally mounted hammer 3 thereon is embedded at the rear part of the frame 1 of the semi-automatic pistol with double action trigger mechanism according to the invention.
• the pin 4 with pivotally attached lever 5 of the hammer 3 ended with the projection 6.
• This lever is at its upper part formed into abutting surface 7 which rests against pin 8 sited in the frame 1.
• the projection 6 of the lever 5 of the hammer 3 comes into contact with the guide surface 9 formed in the frame 1.
• the pin 2 of the hammer 3 is secured in its position by the surface 10 of the lever 5 which is in engagement with the slot 11 formed on the pin 2 crosswise to its longitudinal axis.
• the front part of the frame 1 houses the trigger 12 pivoted on the pin 13.
• the trigger 12 is by means of pin 14 which is close-connected with the draw bar 15 joined-up with the draw bar 15 consisting of single-arm, which is placed at the one side of the magazine channel 16 and is loaded with the spring 17.
• On the draw bar 15 is formed a lug 18 designed for engagement with a boss 19 made at the lever 5 and with the projection 25 made at the sear 26 of the hammer 3.
• the lug 18 comes at certain moment also into engagement with the nose 21, which is made at the lever 20 of block of firing pin 39.
• the draw bar 15 is provided with inclined surface 22, which in the final stage of cocking motion comes into contact with the rotating roller 23 which is axially mounted on the pin 8.
• the draw bar 15 is further provided with a lug 24 which comes into engagement with the surface 27 of the slide 28 when the sear
• the pin 8 is secured in its position by the ejector 30 which is with its surface 31 in the engagement with the crosswise slot 32 made up on the pin 8.
• the safety 33 which is made of stud 34 and safety control 35 and is in its position secured by the cut 36 of the ejector 30 which is loaded by the spring 37 and is in engagement with crosswise slot 38 made up on the stud 34 of the safety 33.
• the slide 28 also houses a firing pin 39, which is activated by the hammer 3 loaded with the main spring 40.
• the hammer 3 is automatically cocked when the slide 28 travels rearward towards the shooter, or the hammer 3 can be also cocked manually for the first shot using hammer head' s serrated surface 45 illustrated in Fig. 6.
• the cocked hammer 3 is intercepted by the sear 26 loaded by the spring 29.
• the draw bar 15 is together with the trigger 12 retracted partially to the rear towards shooter.
• the slide 28 After discharge, as per condition illustrated in Fig. 5, the slide 28 travels rearward towards the shooter and during this movement the hammer 3 is again automatically cocked.
• the surface 27 of the slide 28 comes onto lug 24 formed on the draw bar 15 and the draw bar 15 is pressed down against the force of the spring 17.
• the lug 18 of the draw bar 15 is disengaged from the nose 21 of the lever 20.
• the lever 20 moves unhindered around the pin 8 and is not acting by its cog 44 on the projection 25 of the sear 26 thereby liberating the sear 26 which under the force of the spring 29 again intercepts the hammer 3 in its cocked position.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Portable Nailing Machines And Staplers (AREA)

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Publications (2)

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Cited By (1)

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Citations (1)

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• 2007
  • 2007-06-26 CZ CZ20070434A patent/CZ301749B6/cs not_active IP Right Cessation
• 2008
  • 2008-06-11 WO PCT/CZ2008/000063 patent/WO2009000218A2/en active Application Filing
  • 2008-06-11 EP EP08773239A patent/EP2160562B1/en not_active Not-in-force
• 2009
  • 2009-11-29 IL IL202394A patent/IL202394A/en active IP Right Grant

Patent Citations (1)

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