Bolt for a straight-pull bolt-action rifle

Abstract

A breech for a straight-pull repeater rifle, comprising a breech box and a locking sleeve guided therein as well as a locking bar guided in the breech box and connected to the locking sleeve, the locking bar connects a bolt head to a bolt handle with a interposition of a chain link, wherein the chain link is linked in an articulated manner to the locking bar and the bolt handle, and the bolt handle can be swivelled between an open position and a closed position of the breech and interacts with a firing pin nut connected to a firing pin. A bolt head inserted into a breech sleeve at an end of the breech facing away from the bolt handle is provided. The locking sleeve and the locking bar are a one-part locking sleeve-bar and a locking spring pushing the chain link in the direction of its closed position is provided.

1 . A breech for a straight-pull repeater rifle, which comprises a breech box and a locking sleeve guided therein as well as a locking bar guided in the breech box and connected in one piece to the locking sleeve, the locking bar connects a bolt head facing a cartridge chamber to a bolt handle with the interposition of a chain link, wherein the chain link is linked in an articulated manner to the locking bar and the bolt handle, and the bolt handle is swivelled between an open position and a closed position of the breech and interacts with a firing pin nut connected to a firing pin, and a bolt head is inserted into a breech sleeve at an end of the breech facing away from the bolt handle, wherein the locking sleeve and the locking bar are made as a one-part locking sleeve-bar and a locking spring surrounding the locking sleeve-bar pushes the chain link in the direction of its closed position. 
     
     
         2 . The breech according to  claim 1 , wherein a stop element for the locking spring comprising at least one pressure release slot is provided on the locking sleeve-bar. 
     
     
         3 . The breech according to  claim 2 , wherein the stop element comprises a plurality of three pressure release slots, which are flat areas on the stop element and spaced uniformly apart from one another. 
     
     
         4 . The breech according to  claim 1 , wherein the chain link is connected in an articulated manner to both the bolt handle and the locking sleeve-bar by means of a hinged connection. 
     
     
         5 . The breech according to  claim 1  wherein in closed position of the breech a longitudinal axis of the locking sleeve-bar encloses an angle of ≤0° with an axis running through centre points of an articulated connection between bolt handle and the locking sleeve-bar. 
     
     
         6 . The breech according to  claim 1 , wherein the locking sleeve-bar with the bolt head and at least two clamping jaws are locked with a locking spring surrounding the locking sleeve-bar in the breech box. 
     
     
         7 . The breech according to  claim 1 , wherein the locking sleeve-bar encloses an angle with a longitudinal axis of the breech of ≤4°. 
     
     
         8 . The breech according to  claim 1 , wherein different bolt heads with different calibres from one another can be arranged in the breech sleeve in cooperation with the locking sleeve-bar. 
     
     
         9 . The breech according to  claim 1 , wherein the breech box is provided with a spring-loaded push-in lock at its end incorporating the bolt head. 
     
     
         10 . The use of a breech for a straight-pull repeater rifle according to  claim 1 , in a straight-pull repeater rifle which can be used with ammunition calibres and barrel inner diameters different from one another.