Resilient Stop Assembly for Impact Tool Energy Absorption

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Solution Overview

Problem

Existing impact tools lack an efficient mechanism to absorb and manage kinetic energy at the end of the driving stroke, often resulting in excessive pressure on the resilient stop, which can limit design flexibility and energy absorption capabilities.

Innovation Solution

A resilient stop assembly comprising first and second deformable parts and a substantially rigid part, where the kinetic energy is absorbed in stages through the impact surfaces, allowing for different shapes, hardnesses, and elasticities, and a larger surface area for energy dispersion, thereby reducing pressure on the deformable parts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a resilient end stop is used to halt the driver's forward motion, then kinetic energy is absorbed, but the driver design is compromised and excessive pressure is generated

Engineering Contradiction:

Improvekinetic energy absorptionVSAvoidpressure on driver

Core Design Contradiction:

Loss of energyVSStress or pressure

Solution Approach 1:

The resilient stop assembly is divided into multiple independent resilient members (first resilient member, second resilient member, third resilient member) arranged in sequence. Each member absorbs kinetic energy independently through deformation, distributing the energy absorption process across multiple stages rather than concentrating it in a single component, thereby reducing peak pressure on the driver.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The resilient members are arranged in a longitudinal sequence along the driver's path of motion, creating a distributed energy absorption system. The first resilient member is positioned to contact the driver first, followed by the second and third members in sequence, effectively extending the energy absorption process along the dimension of the driver's travel path.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Device complexity

If a single resilient end stop is used, then the structure is simple, but kinetic energy cannot be absorbed effectively in stages

Engineering Contradiction:

Improvestructure simplicityVSAvoidkinetic energy absorption efficiency

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each resilient member has different physical parameters (hardness, density, deformation characteristics) to optimize energy absorption at different stages. The first resilient member contacts the driver first and absorbs initial energy, while subsequent members absorb remaining energy, with each member's properties tailored to its specific function in the energy absorption sequence.

Inventive Principle:

Principle #35Parameter changes

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

This solution enables effective absorption of kinetic energy in multiple stages, allowing for optimized design of the driver and increased energy absorption without excessive pressure, providing greater design freedom and improved performance in impact tools.

Implementation Method 1

the first resiliently deformable part is arranged to reduce the speed of the driver upon impact of the driver against the resilient stop assembly

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

the second resiliently deformable part is arranged to bring the driver to rest

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS8104547B2Resilient stop assembly for impact tool

Publication Date: 2012.01.31 BLACK & DECKER CORP

AI summary

A resilient stop assembly for an impact tool includes first and second resiliently deformable parts, and a substantially rigid part situated between the deformable parts. Each of the first and second resiliently deformable parts and the substantially rigid part comprises: first and second opposite impact surfaces, at least one peripheral surface joining the impact surfaces, and an aperture extending entirely through the part between exit openings in the impact surfaces. The first impact surface of the second resiliently deformable part is separated from the second impact surface of the first resiliently deformable part by contact of those first and second impact surfaces with the substantially rigid part.