Nailer Driver Separation via Resilient Biasing

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Solution Overview

Problem

Existing driving tools, such as nailers, face challenges in reducing or eliminating contact between the driver and the flywheel when the tool is not in use, leading to inefficiencies and potential damage.

Innovation Solution

A driving tool design featuring a motor assembly with a flywheel, a pinch roller, and a resilient member that biases the driver away from the flywheel when it is at rest, and a support structure that contacts the driver to maintain separation, allowing for controlled engagement when needed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the driver remains in contact with the flywheel during idle periods, then the driver is ready for immediate operation, but wear and tear increases and tool longevity decreases

Engineering Contradiction:

Improvetool longevityVSAvoidengagement readiness

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The resilient member applies a preliminary separating force between the driver and flywheel during idle periods, preventing contact before wear can occur. This anti-action is automatically reversed when the pinch roller engages the driver, ensuring readiness while protecting against wear.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The system transitions from a static contact state to a dynamic separated state using the resilient member. The driver can be quickly re-engaged through the pinch roller mechanism, providing dynamic control over the contact state to balance readiness with wear prevention.

Inventive Principle:

Principle #15Dynamics

2Duration of action of stationary object

If the driver is separated from the flywheel during idle periods, then wear and tear is reduced, but the driver must be re-engaged when operation is needed

Engineering Contradiction:

Improvetool operational lifeVSAvoiddriver engagement

Core Design Contradiction:

Duration of action of stationary objectVSEase of operation

Solution Approach 1:

The resilient member automatically performs the separation function without user intervention, and the pinch roller mechanism enables quick re-engagement. The system serves itself by maintaining the separated state during idle periods while allowing rapid engagement when needed.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The resilient member acts as an intermediary between the driver and flywheel, controlling their interaction. It automatically inserts itself to prevent contact during idle periods and can be quickly removed from the interaction when the pinch roller engages the driver.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If continuous contact between driver and flywheel is maintained, then operational readiness is ensured, but energy loss and inefficiency increase

Engineering Contradiction:

Improveoperational readinessVSAvoidenergy efficiency

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The system uses periodic engagement through the pinch roller mechanism rather than continuous contact. The resilient member maintains separation during idle periods, and engagement occurs periodically only when the pinch roller actuates the driver, reducing energy loss while maintaining productivity.

Inventive Principle:

Principle #19Periodic action

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 reduces wear and tear by minimizing contact between the driver and flywheel during idle periods, enhancing tool longevity and operational efficiency by ensuring precise engagement when activated.

Implementation Method 1

The resilient member is coupled to the frame and biases the driver away from the flywheel to reduce or eliminate contact between the flywheel and the driver when the flywheel is at rest

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

the pinch roller is selectively movable from a first position to a second position to drive the driver into engagement with the flywheel

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS8025197B2Profile lifter for a nailer

Publication Date: 2011.09.27 BLACK & DECKER CORP

AI summary

A driving tool that includes a frame, a motor assembly and a resilient member. The motor assembly is coupled to the frame and includes an electric motor, a flywheel driven by the electric motor, a pinch roller and a driver disposed between the flywheel and the pinch roller. The pinch roller is selectively movable from a first position to a second position to drive the driver into engagement with the flywheel. The driver is movable between a returned position and an extended position. The resilient member is coupled to the frame and biases the driver away from the flywheel to reduce or eliminate contact between the flywheel and the driver when the flywheel is at rest, the driver is in the returned position and the pinch roller is in the first position. A method for operating a driving tool is also provided.