Fastener Driving Tool Inertial Lock for Accidental Firing Prevention
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Solution Overview
Problem
Existing driving tools face issues with safety due to inertial forces causing the contact arm to move unintentionally, leading to increased biasing load or reduced operation efficiency, as they either require high spring loads or slowed valve reactions to prevent accidental driving.
Innovation Solution
Incorporating a restricting portion that restricts driving operations when inertial forces are detected, without increasing the contact arm's spring load or slowing down the main valve reaction, using a slide or rotation restricting mechanism to prevent the contact arm from entering the sign on state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the load of the biasing member is increased to prevent the contact arm from moving due to inertial force, then safety is improved, but the pressing load of the contact arm increases and usability deteriorates
Solution Approach 1:
The safety mechanism is divided into two independent parts: the contact arm for normal operation and the inertial mass with restricting portion for accident prevention. This segmentation allows each part to be optimized for its specific function without compromising the other.
Solution Approach 2:
The inertial mass acts as an intermediary element that detects abnormal acceleration and triggers the restricting portion to engage with the contact arm, preventing accidental operation without requiring increased biasing load.
2Reliability
If the reaction of the main valve is slowed down to prevent fastener driving during inertial force, then safety is improved, but operation feeling deteriorates and working efficiency is reduced
Solution Approach 1:
The restricting mechanism uses dynamic inertial mass that responds only to abnormal acceleration patterns. During normal operation, the valve reacts quickly without restriction, but during accidental drops or impacts, the inertial mass moves to engage the restricting portion and prevent operation.
Solution Approach 2:
The inertial mass provides feedback about abnormal motion conditions to the restricting portion, which then engages to prevent fastener driving only when necessary, maintaining normal fast operation under standard conditions.
3Object-affected harmful factors
If a high spring load is used to prevent contact arm movement during inertial force, then accidental driving is prevented, but the burden on the operator increases
Solution Approach 1:
The inertial mass functions as a counterweight that detects abnormal acceleration forces. When normal operation forces are applied, the contact arm can move freely against the light spring load. When abnormal inertial forces occur, the inertial mass moves to physically block the contact arm, preventing accidental driving without requiring high spring loads.
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
Ensures safety and maintains operability by preventing accidental driving without increasing the contact arm's biasing load or slowing down the main valve reaction, thus enhancing user safety and efficiency.
Implementation Method 1
an inertial mass 66 that moves when an inertial force is generated in the first direction
Data Source
AI summary
There is provided a driving tool for driving a fastener to a fastening target object including: a contact arm capable of moving in a first direction by being brought into contact with and pressed against the fastening target object; a driving portion configured to start a driving operation of the fastener on condition that the contact arm moves by a predetermined amount in the first direction; and a restricting portion configured to restrict the driving operation performed by the driving portion when an inertial force is generated in the first direction.