Oct 7, 2025

US12435941 - Trigger assembly and method of calibrating and adjusting a pull force on a trigger

A trigger assembly and associated method for use for the adjustment of trigger pull force of a firearm. The trigger assembly having a housing with an adjustment means in the form of a fastener in communication with one or more trigger springs that interface with a trigger. The adjustment means can be configured to adjust a length of one or more trigger springs to adjust the trigger pull force of the trigger assembly. A calibrated force tester can be coupled to a portion of the trigger to test the amount of trigger pull force necessary to release a hammer of the trigger assembly. The trigger assembly enables a calibrated repeatable method of giving a user the ability to adjust the trigger system pull force by the means of a calibrated laser etched scale on the trigger housing that works in conjunction with the adjustment means.

Inventors: David Wiese
Filing date: 2024-01-16

triggerfirearmadjustment

The patent describes a trigger assembly designed for firearms that allows users to adjust the trigger pull force through an adjustment fastener that modifies the compressive force on trigger springs. This assembly includes a calibrated scale for repeatable adjustments and a method for testing the trigger pull force using a calibrated force tester.

Claim 1

An improved trigger assembly apparatus comprising: a housing portion, the housing portion configured for receipt into a firearm, wherein the housing portion has a first sidewall, a second sidewall, and a bottom wall, wherein a cavity is formed within the first sidewall, second sidewall, and bottom wall, wherein the bottom wall includes a first aperture and a second aperture, wherein the second aperture is configured to accept an adjustment fastener; a trigger, wherein a first portion of the trigger is at least partially positioned and received within the cavity of the housing and a second portion of the trigger portion is configured to extend out of the first aperture on the bottom wall of the housing portion, the trigger is pivotably coupled the housing, wherein the first portion includes an adjustment cavity having an interior sidewall and top surface; a first spring having a diameter and a length, wherein the first spring is housed within the adjustment cavity of the trigger, wherein the adjustment fastener is configured to adjust the compressive force exerted onto the adjustment cavity of the trigger, wherein the adjustment fastener can be moved from a first position to a second position, wherein the first position exerts a first compressive force against the adjustment cavity and the second position exerts a second compressive force against the adjustment cavity of the trigger, wherein the first compressive force and second compressive force correlate to a pull force of the trigger, and wherein the adjustment fastener includes an indicator line. a housing portion, the housing portion configured for receipt into a firearm, wherein the housing portion has a first sidewall, a second sidewall, and a bottom wall, wherein a cavity is formed within the first sidewall, second sidewall, and bottom wall, wherein the bottom wall includes a first aperture and a second aperture, wherein the second aperture is configured to accept an adjustment fastener; a trigger, wherein a first portion of the trigger is at least partially positioned and received within the cavity of the housing and a second portion of the trigger portion is configured to extend out of the first aperture on the bottom wall of the housing portion, the trigger is pivotably coupled the housing, wherein the first portion includes an adjustment cavity having an interior sidewall and top surface; a first spring having a diameter and a length, wherein the first spring is housed within the adjustment cavity of the trigger, wherein the adjustment fastener is configured to adjust the compressive force exerted onto the adjustment cavity of the trigger, wherein the adjustment fastener can be moved from a first position to a second position, wherein the first position exerts a first compressive force against the adjustment cavity and the second position exerts a second compressive force against the adjustment cavity of the trigger, wherein the first compressive force and second compressive force correlate to a pull force of the trigger, and wherein the adjustment fastener includes an indicator line.

Google Patents

https://patents.google.com/patent/US12435941

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12435941