Gas Spring Fastener Driver Layout for Short-Stroke Driving Force

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Solution Overview

Problem

Existing fastener drivers face power, size, and cost constraints, particularly those using compressed air or electrical energy, which limit their efficiency and practicality.

Innovation Solution

A gas spring-powered fastener driver with a non-concentric inner and storage chamber cylinder configuration, a reduced stroke length, and a compact design, utilizing a lifter and drive unit to provide torque for driving fasteners, eliminating the need for external air pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If conventional fastener drivers use compressed air or electrical energy, then sufficient driving force can be achieved, but power, size, and cost constraints are increased

Engineering Contradiction:

Improvestriker forceVSAvoidpower system complexity

Core Design Contradiction:

ForceVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the complex external power systems (air compressors, electrical motors) by using a self-contained spring mechanism that stores mechanical energy internally, resolving the contradiction between achieving sufficient force and reducing device complexity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The spring-driven mechanism uses periodic loading and unloading of the spring to generate repeated driving cycles, enabling continuous fastener operation without complex power supply systems while maintaining adequate striker force

Inventive Principle:

Principle #19Periodic action

2Force

If fastener drivers are designed with larger components for sufficient power, then driving capability is improved, but size and weight increase

Engineering Contradiction:

Improvedriving capabilityVSAvoiddriver weight

Core Design Contradiction:

ForceVSWeight of moving object

Solution Approach 1:

The patent optimizes the spring parameters (coil diameter, wire diameter, number of turns) to achieve the required striker force with a compact, lightweight design, resolving the contradiction between driving capability and weight

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The mechanism uses dynamic motion of the piston and driver blade to convert stored spring energy into high-velocity impact, achieving sufficient driving force with minimal mass

Inventive Principle:

Principle #15Dynamics

3Length of moving object

If piston stroke length is reduced for compact design, then device size is decreased, but driving effectiveness may be compromised

Engineering Contradiction:

Improvepiston stroke lengthVSAvoidfastener driving effectiveness

Core Design Contradiction:

Length of moving objectVSForce

Solution Approach 1:

The spring is pre-loaded to store sufficient energy before the driving cycle begins, ensuring that even with reduced stroke length, the accumulated energy delivers effective driving force to the fastener

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The curved or inclined surface on the driver blade converts the short linear piston motion into effective rotational or lateral motion that engages the fastener more efficiently, maintaining driving effectiveness with reduced stroke

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Length of moving object

If lifter diameter is reduced for compact design, then device size is decreased, but lifting shear stress increases

Engineering Contradiction:

Improvelifter diameterVSAvoidlifting shear stress

Core Design Contradiction:

Length of moving objectVSStress or pressure

Solution Approach 1:

The lifter is made from high-strength materials or composite materials that can withstand elevated shear stresses in a reduced-size component, resolving the contradiction between compact size and stress resistance

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The lifter design incorporates localized reinforcement or optimized geometry at critical stress points, allowing the overall diameter to be reduced while maintaining sufficient strength where needed

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The compact design allows for efficient fastener driving with reduced size and weight, while maintaining sufficient striker force and balance, and reduces lifting shear stress, enhancing operational efficiency and handling.

Implementation Method 1

gas spring-powered fastener drivers

Methodology Applied

Scientific EffectGas spring: Spring

Implementation Method 2

a drive unit operably coupled to the lifter to provide torque thereto, causing the lifter to rotate

Methodology Applied

Scientific EffectTorque: Torque

Data Source

PatentUS12502755B2Powered fastener driver

Publication Date: 2025.12.23 MILWAUKEE ELECTRIC TOOL CORP

AI summary

A powered fastener driver including a piston movable within an inner cylinder from a top-dead-center (TDC) position to a driven or bottom-dead-center (BDC) position. The piston has a reduced stroke length between the TDC position and the BDC position.