Driving Tool Contact-Arm Mechanism for Inertial-Force Safety
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Solution Overview
Problem
Existing driving tools face issues with safety and usability due to high biasing loads on contact arms and slow main valve reactions, which can lead to accidental operation and reduced efficiency when inertial forces are generated.
Innovation Solution
A driving tool with a contact arm mechanism that includes a restricting portion to prevent driving operation during inertial forces, without increasing the biasing load or slowing down the main valve reaction, using a slide or rotation restricting member to maintain safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the load of the biasing member is set to be high 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 invention divides the safety function into two independent parts: the contact arm mechanism and the slide portion mechanism. The contact arm detects contact with the workpiece, while the slide portion independently detects inertial forces. This segmentation allows each mechanism to be optimized separately, enabling low biasing load on the contact arm for good usability while maintaining safety through the dual-mechanism approach.
Solution Approach 2:
The slide portion acts as an intermediary mechanism that detects inertial forces independently and restricts the driving operation directly. Instead of relying on the contact arm to handle both contact detection and inertial force resistance, the slide portion serves as a mediator that specifically addresses inertial force prevention, allowing the contact arm to maintain low biasing load for comfortable operation.
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 reduces
Solution Approach 1:
The invention segments the safety control function from the main valve reaction mechanism. Instead of modifying the main valve's reaction speed, a separate slide portion mechanism is introduced to detect inertial forces and restrict driving operation independently. This allows the main valve to maintain its original fast response for efficient operation while the slide portion provides safety against inertial force accidents.
3Object-affected harmful factors
If the load of the biasing member is set to be high to prevent contact arm movement, then prevention of accidental operation is improved, but the burden on operator increases
Solution Approach 1:
The invention divides the protection function against harmful effects into two separate mechanisms: the contact arm for contact detection and the slide portion for inertial force detection. This segmentation eliminates the need for high biasing load on the contact arm, reducing operator burden while maintaining protection against accidental operation through the slide portion's independent inertial force sensing.
Solution Approach 2:
The slide portion serves as an intermediary mechanism that specifically handles the harmful effect of inertial forces. By introducing this mediator, the contact arm is relieved of the burden of resisting high inertial forces, allowing it to operate with low biasing load for operator comfort while the slide portion independently prevents accidental operation caused by inertial shocks.
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 operational efficiency by preventing accidental driving during inertial forces, without compromising user comfort or working speed.
Implementation Method 1
a load of a biasing member for biasing the contact arm in a non-operation direction
Implementation Method 2
an inertial force that causes the contact arm to move in an operation direction (the counter-protruding direction) is generated
Data Source
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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.