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Bolt mechanism for fire arm

  • US 4,893,547 A
  • Filed: 09/14/1987
  • Issued: 01/16/1990
  • Est. Priority Date: 12/31/1981
  • Status: Expired due to Term
First Claim
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1. Bolt locking mechanism for a firearm including a breech, comprising:

  • a bolt carrier selectively movable on a predetermined path;

    a bolt movable with the bolt carrier either to a forward position relative to the breech of the forearm, or to a rearward position, the bolt carrier being associated with the bolt to allow the bolt carrier a limited extent of forward travel beyond the forward position of the bolt;

    cam means associated with the bolt carrier and extending longitudinally of the bolt carrier;

    the bolt having a hollow portion within which the cam means moves as the bolt carrier travels relative to the bolt;

    lock means movable with the bolt and operable by said cam means, in response to the limited extent of forward travel by the bolt carrier, to move vertically relative to the bolt on a path normal to the path of bolt movement, so as to extend upwardly from the top of the bolt and engage the breech, locking the bolt in the forward position;

    the lock means being disposed in the hollow portion of the bolt;

    the lock means including surfaces defining a window extending within the hollow portion of the bolt along a path generally parallel to the path of bolt movement, and receiving the longitudinally-extending cam means in operative relation with the window-defining surfaces,so that the cam means moves the lock means vertically to lock or unlock the bolt as the cam means moves longitudinally within the window in the hollow portion of the bolt.

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