Takedown Lever Assembly With Trigger Block for Safe Handgun Disassembly

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing handguns face challenges in preventing unintentional discharge during the takedown and cleaning process due to users not following safe protocols, such as pulling the trigger without clearing the chamber or attempting to load a magazine with the slide removed.

Innovation Solution

A takedown lever that rotates counterclockwise to a takedown position, incorporating a safety block that prevents trigger rotation and magazine installation, ensuring the lever is stable as a thumb rest and blocking unsafe actions during disassembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a traditional takedown lever is used that rotates clockwise to takedown position, then the lever can be moved to remove the slide for cleaning, but the lever becomes unstable when downward pressure is applied by the user during firing

Engineering Contradiction:

Improvestability as thumb restVSAvoidlever stability under downward pressure

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The patent applies inversion by reversing the traditional clockwise rotation direction to counterclockwise rotation. This directional reversal changes the lever's orientation in the takedown position, allowing the top surface to provide a stable resting surface for the user's thumb during firing, while maintaining the ability to rotate to the takedown position for slide removal.

Inventive Principle:

Principle #13The other way round (Inversion)

2Productivity

If the takedown lever is moved to the takedown position without safety mechanisms, then the slide can be removed for cleaning, but the user may unintentionally discharge the firearm or attempt to load a magazine with the slide removed

Engineering Contradiction:

Improveease of takedown for cleaningVSAvoidunintentional discharge risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by implementing safety mechanisms that are automatically engaged when the takedown lever is moved to the takedown position. The safety block moves to block the trigger, and the magazine block prevents magazine insertion, before any takedown operation can proceed. This ensures safety conditions are established in advance before the user performs cleaning operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses intermediary components (safety block and magazine block) that mediate between the takedown lever operation and the potential harmful actions. These blocks act as intermediaries that physically prevent trigger activation and magazine insertion when the lever is in the takedown position, thereby preventing unintentional discharge and unsafe loading attempts.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a safety block is added to prevent trigger rotation during takedown, then unintentional discharge is prevented, but the device complexity increases

Engineering Contradiction:

Improveprevention of unintentional dischargeVSAvoidnumber of safety components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies merging by combining multiple safety functions into a single integrated takedown lever assembly. The safety block and magazine block are operatively connected to the takedown lever, so that one lever operation simultaneously activates both safety mechanisms. This reduces overall device complexity compared to having separate safety devices for each function.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The takedown lever serves multiple functions: it enables slide removal for cleaning, acts as a safety mechanism by moving the safety block to block the trigger, and prevents magazine insertion by moving the magazine block. This multi-functionality reduces the need for separate components, thereby managing device complexity while providing comprehensive safety.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250354771A1Takedown lever, takedown safety, and trigger shoe

Publication Date: 2025.11.20 SIG SAUER INC

AI summary

A handgun trigger has a trigger body configured for pivotable or rotatable movement when installed in a handgun. A trigger shoe is removably attached or attachable to the trigger body and defines a user interface for firing the handgun. The trigger shoe can be made of polymeric material and can be attached to the trigger body using a snap fit. For example, the trigger shoe snaps over rear-facing surfaces of the trigger body when installed. Also disclosed is a takedown lever assembly for a semiautomatic handgun, where the takedown actuation lever operable between a firing position and a takedown position. In the takedown position the takedown actuation lever permits removal of the slide from the frame. In the takedown position the trigger is blocked from rotating to the pulled trigger position.