Two-stage trigger mechanism for firearms

Abstract

A multi-stage trigger mechanism for a firearm having a trigger body that is pivotally mounted to the receiver of a firearm having a pivotally moveable spring-urged hammer having a trigger hook and a hammer hook. A disconnector is pivotally mounted to the trigger body and has a spring retainer securing a disconnector spring to the disconnector. The disconnector has a hook member defining a timing surface that serves to delay hammer reset and provides enhanced trigger hook engagement to prevent doubling during firing activity.

I claim: 
     
         1 . A multi-stage trigger mechanism for a firearm, comprising:
 a trigger body having a mounting pin mounting said trigger body to the receiver of a firearm having a pivotally moveable spring-urged hammer having a trigger hook and a hammer hook, said trigger body defining a spring receptacle;   a disconnector being pivotally mounted to said trigger body and defining a spring retainer structure; and   a disconnector spring having a first portion thereof mounted to said spring retainer structure and having a second portion thereof disposed within said spring receptacle, said disconnector spring being moveable with said disconnector and applying spring force to said disconnector and said trigger body.   
     
     
         2 . The multi-stage trigger mechanism of  claim 1 , comprising:
 said disconnector spring being a coil type compression spring having generally circular first and second ends;   said spring retainer being a spring retainer projection having an undercut portion defining a spring opening and retaining said first end of said coil type compression spring.   
     
     
         3 . The multi-stage trigger mechanism of  claim 1 , comprising:
 a disconnector stop member being defined by said trigger body and having a stop surface limiting spring urged pivotal movement of said disconnector relative to said trigger body.   
     
     
         4 . The multi-stage trigger mechanism of  claim 1 , comprising:
 a trigger rotation limit projection being defined by said trigger body and being disposed for contact with a firearm receiver and preventing over-rotation of said trigger body.   
     
     
         5 . The multi-stage trigger mechanism of  claim 1 , comprising:
 a hammer engaging cam surface being defined by said disconnector; and   a disconnector sear being defined by said disconnector and having a hammer engagement cam surface and a disconnector sear projection establishing a hammer return cam surface of sufficient length to hold said hammer down sufficiently to prevent following, a portion of said hammer engagement cam surface being a second stage cam surface.   
     
     
         6 . The multi-stage trigger mechanism of  claim 5 , comprising:
 said hammer engaging cam surface being of substantially planar configuration; and   said disconnector sear projection establishing a surface disposed in angular relation with said hammer engaging cam surface.   
     
     
         7 . The multi-stage trigger mechanism of  claim 1 , comprising:
 a pair of spaced disconnector mount flanges being defined by said trigger body and having apertures formed therein; and   a pivot pin extending through said apertures of said spaced disconnector mount flanges and through said disconnector member and mounting said disconnector for pivotal movement about said pivot pin.   
     
     
         8 . The multi-stage trigger mechanism of  claim 5 , comprising:
 said disconnector having a hammer contact surface and a timing surface having intersection with said first surface and being disposed in angular relation with said hammer contact surface, said angular timing surface causing said hammer contact surface of said disconnector to be of sufficient length to hold said hammer down during return for a sufficient period of time to prevent doubling during firing activity.   
     
     
         9 . A multi-stage trigger mechanism for a firearm, comprising:
 a trigger body having a mounting pin mounting said trigger body to the receiver of a firearm having a pivotally moveable spring-urged hammer having a trigger hook and a hammer hook and defining a hammer sear surface and defining a disconnector engaging projection;   a disconnector being pivotally mounted to said trigger body and having a disconnector hook defining a disconnector cam surface disposed for engagement by said disconnector engaging projection of said hammer hook, said disconnector cam surface being of substantially straight configuration;   a disconnector spring having force transmitting engagement with said disconnector and said trigger body and urging said disconnector pivotally toward said trigger hook;   a disconnector hook cam surface being defined by said disconnector hook and being engaged by said disconnector engaging projection of said hammer hook during return rotation movement of said hammer   an angulated timing surface extending from said disconnector cam surface and having intersection with said disconnector hook cam surface, said angulated timing surface establishing a greater length of said disconnector cam surface achieving delay of hammer reset and preventing doubling of firing activity during use.   
     
     
         10 . The multi-stage trigger mechanism of  claim 9 , comprising:
 2. The multi-stage trigger mechanism of  claim 1 , comprising:   said disconnector spring being a coil type compression spring having generally circular first and second ends;   said spring retainer being a spring retainer projection having an undercut portion defining a spring opening and retaining said first end of said coil type compression spring.   
     
     
         11 . The multi-stage trigger mechanism of  claim 9 , comprising:
 a disconnector stop member being defined by said trigger body and having a stop surface limiting spring urged pivotal movement of said disconnector relative to said trigger body.   
     
     
         12 . The multi-stage trigger mechanism of  claim 9 , comprising:
 a trigger rotation limit projection being defined by said trigger body and being disposed for contact with a firearm receiver and preventing over-rotation of said trigger body.   
     
     
         13 . The multi-stage trigger mechanism of  claim 9 , comprising:
 a hammer engaging cam surface being defined by said disconnector; and   a disconnector sear being defined by said disconnector and having a hammer engagement cam surface and a disconnector sear projection establishing a hammer return cam surface of sufficient length to hold said hammer down sufficiently to prevent following, a portion of said hammer engagement cam surface being a second stage cam surface.   
     
     
         14 . The multi-stage trigger mechanism of  claim 13 , comprising:
 said hammer engaging cam surface being of substantially planar configuration; and   said disconnector sear projection establishing a surface disposed in angular relation with said hammer engaging cam surface.   
     
     
         15 . The multi-stage trigger mechanism of  claim 9 , comprising:
 a pair of spaced disconnector mount flanges being defined by said trigger body and having apertures formed therein; and   a pivot pin extending through said apertures of said spaced disconnector mount flanges and through said disconnector member and mounting said disconnector for pivotal movement about said pivot pin.   
     
     
         16 . The multi-stage trigger mechanism of  claim 9 , comprising:
 said disconnector having a hammer contact surface and a timing surface having intersection with said first surface and being disposed in angular relation with said hammer contact surface, said angular timing surface causing said hammer contact surface of said disconnector to be of sufficient length to hold said hammer down during return for a sufficient period of time to prevent doubling during firing activity.