Patent ID: 8099895

Claim:
A trigger mechanism for use in a firearm comprising: a frame having a rear panel and one or more integral sides; a front panel receivable and affixable to the frame; a sear block positioned near a top of the frame, mounted about a first pivot to rise into a first position to engage a cocking piece or striker of a firearm to hold the cocking piece or striker in a cocked position, and having a second position pivotally rotated to release the cocking piece or striker, wherein the cocking piece or striker provides a downward force upon the sear block when in the first position of a tensioned firing train; a pivot drop piece having a top end extending through an angular channel orifice in a top of the frame, the top end of the pivot drop piece engaging the sear block and operative to hold the sear block in the first position; a toggle sear disposed within the frame having a notch receiving a bottom end of the pivot drop piece, mounted about a second pivot so as to support the first position of the sear block in an over center geometry when cocked, having a first sear surface; a toggle sear fly weight member affixed to the toggle sear in a position storing kinetic energy during movement of the toggle sear, and providing kinetic resistance about the second pivot from a state of rest; and a finger piece mounted about a third pivot, having a finger actuating portion and a second sear surface, wherein the first and second sear surfaces mate to each other in a friction relationship to keep the sear block, pivot drop piece and toggle sear in a tensioned, over center, non-collapsed arrangement with the sear block in the first position, and wherein pressure equal to or greater than a threshold pressure upon the finger actuating portion overcomes the friction between the first and second sear surfaces, thereby rotating the finger piece about the third pivot to release the toggle sear to rotate about the second pivot as damped by a lack of kinetic inertia in the fly weight member, the rotation of the toggle sear leading to a collapse of the over center support of the sear block via the pivot drop piece, thereby releasing the cocking piece or striker, the fly weight member then storing kinetic inertia so as to continue providing rotational force about the second pivot such that the collapse completes and the sear block is dropped completely to the second position to allow travel of the cocking piece or striker unimpeded by friction with the sear block.