Single-stage and two-stage trigger mechanism for a firearm
AssigneeCadequip, Inc.
InventorSerge Dextraze
Life of this patent
Estimating the term…
Abstract
A trigger mechanism including a top sear for engaging a cocking piece, a transfer arm for engaging the top sear, and a safety lever and second stage sear which engages the transfer arm. The safety lever prevents unintentional firing of a firearm with the trigger mechanism. A bottom sear cooperates with the safety lever and the second stage sear. A reset spring biases the transfer arm. A single stage operation involves both a first stage spring and second stage spring upon trigger load application. In a two-stage operation, the first stage spring is engaged and then the second stage spring is also engaged. A selector pin provides flexibility to alter the mode of operation of the trigger mechanism between single stage trigger operation and a double stage trigger operation.
Claims27
A trigger mechanism for a firearm comprising:
- at least one plate element having a front, a back, a top and a bottom;
- a top sear pivotally mounted to said at least one plate element about a top sear pivot point and extending substantially along said top of said at least one plate element, said top sear including a back portion which is biased upward to prevent firing, wherein said top sear is biased in a counterclockwise direction;
- a transfer arm pivotally mounted to said at least one plate element about a transfer arm pivot point positioned below said top sear pivot point, said transfer arm having a back portion biased upward so as to urge said back portion of said top sear upward, and wherein said transfer arm has a front portion and a bottom portion;
- a safety lever pivotally mounted to said at least one plate element about a safety lever pivot point positioned below said transfer arm pivot point, said safety lever has a top end configured to cooperate with said bottom portion of said transfer arm, and wherein said safety lever has a bottom end;
- a second stage sear pivotally mounted to said at least one plate element about a second stage sear pivot point positioned below said transfer arm pivot point, said second stage sear having a top member configured to cooperate with said front portion of said transfer arm, and wherein said second stage sear is biased in a clockwise direction so as to engage said transfer arm;
- a trigger extending below said at least one plate element;
- a bottom sear pivotally mounted to said at least one plate element about a bottom sear pivot point, wherein a top portion of said bottom sear cooperates with said bottom end of the safety lever and said second stage sear, and wherein a bottom portion of said bottom sear is operatively connected to said trigger;
- and
- a first stage spring positioned to bias said bottom sear about said bottom sear pivot point in the clockwise direction.
A trigger mechanism for a firearm comprising:
- at least one plate element having a front, a back, a top and a bottom;
- a top sear pivotally mounted to a said at least one plate element about a top sear pivot point and extending substantially along said top of said at least one plate element, said top sear being configured wherein a back portion of said top sear is biased upward to prevent firing, wherein said top sear is biased in a counterclockwise direction;
- a transfer arm pivotally mounted to said at least one plate element about a transfer arm pivot point positioned below said top sear pivot point, said transfer arm having a back portion biased upward absent application of a force so as to urge said back portion of said top sear upward, and wherein said transfer arm has a front portion and a bottom portion;
- a second stage sear pivotally mounted to said at least one plate element about a second stage sear pivot point positioned below said transfer arm pivot point, said second stage sear having a top member configured to cooperate with said front portion of said transfer arm, and wherein said second stage sear is biased in a clockwise direction so as to engage said transfer arm with trigger extending below said at least one plate element;
- a bottom sear pivotally mounted to said at least one plate element about a bottom sear pivot point positioned below said second stage sear pivot point, wherein a top portion of said bottom sear cooperates with said second stage sear and a bottom portion of said bottom sear is operatively connected to said trigger;
- a first stage spring positioned to bias said bottom sear about said bottom sear pivot point in the clockwise direction;
- and
- a second stage spring positioned on said at least one plate element so as to bias said second stage sear in said clockwise direction.
Dependencies are inferred from the claim text.