Trigger mechanism with cam surface sear

摘要

A trigger mechanism has a hammer, a hammer spring, a trigger pull, a trigger spring, a pivotal linkage between the trigger pull and a sear which has a cam surface and a guide. The hammer has striking and bearing ends and a pivot point between the ends. The hammers' bearing end rides up on the cam surface as it moves between different positions relative to the guide. The hammer pivots around the pivot point and the striking end is moved between the hammer's seated and cocked positions as the cam surface moves between its positions. The hammer spring has opposite ends connected to the firearm's frame and the hammer, respectively, which provides a hammer spring force. The hammer spring biases the striking end of the hammer to the seated, striking position and the movement of the hammer to its rearward position is performed against the hammer spring force.

主权项

1. A trigger mechanism for a firearm, comprising:
a trigger pull; a hammer having a striking end, a bearing end and a pivot point between said striking end and said bearing end, said striking end of said hammer having a striking position and a rearward position; a sear comprising a cam surface and a guide, wherein said cam surface has a length extending from a first end to a second end, wherein said bearing end of said hammer engages said cam surface along said length from said first end to said second end as said cam surface is moved relative to said guide from a first position to a second position and pivots said hammer around said pivot point, and wherein said striking end is moved from said striking position to said rearward position as said cam surface moves from said first position to said second position and said hammer pivots around said pivot point; a linkage having a trigger end pivotally connected to said trigger pull and a sear end in contact with said sear, wherein said linkage rotates as said trigger pull is forced rearward and moves said cam surface from said first position to said second position; and a hammer spring having a fixed end and a moving end connected to said hammer providing a hammer spring force, wherein said hammer spring biases said striking end of said hammer to said striking position and wherein said movement of said hammer from said striking position to said rearward position is performed against said hammer spring force.