Driving Tool Timer Mechanism Heat Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional driving tools, such as nail guns, face issues with unstable operation speed due to heat effects on mechanical timer mechanisms using silicon oil in rotary dampers, leading to inconsistent performance and the inability to perform driving operations without electric power.
Innovation Solution
A driving tool with a timer mechanism that includes a restriction wheel and a resistance applying member, which intermittently applies rotational resistance to the wheel, allowing the contact restriction member to move between unlock and lock positions based on trigger operation, preventing inadvertent driving and maintaining stable operation speed regardless of heat influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical timer mechanism using silicon oil in a rotary damper is used to prevent inadvertent driving operations, then the tool can function without electric power, but the operation speed becomes unstable due to heat effects
Solution Approach 1:
The patent replaces the mechanical timer mechanism using silicon oil rotary damper with an electronic control system comprising a micro-switch, timer circuit, and control unit. This substitution eliminates the heat sensitivity of silicon oil while maintaining the timing function to prevent inadvertent driving operations. The electronic timer provides stable operation speed不受温度影响, while the system retains the ability to function without electric power through the contact arm restriction mechanism.
Solution Approach 2:
The patent changes the physical state and material properties of the timing mechanism from a silicon oil-based rotary damper to an electronic timer circuit. This parameter change eliminates the thermal sensitivity inherent in silicon oil viscosity changes, providing stable timing performance across different temperatures while maintaining the safety function of preventing inadvertent operations.
2Ease of operation
If an electrically controlled solenoid valve is used to control the starting valve, then driving operations can be controlled appropriately, but the on/off movement time increases, decreasing driving movement speed
Solution Approach 1:
The patent implements a preliminary action by requiring the contact arm to be on-operated before the trigger can initiate a driving operation. The timer mechanism is activated in advance when the contact arm is pushed, setting a predetermined time period during which the trigger operation will be effective. This preliminary timing action ensures controlled driving operations while maintaining rapid response when the sequence is correctly performed.
3Reliability
If a manual operation type starting valve is used to avoid speed performance problems, then driving operations can be performed without electric power, but the tool cannot perform driving operations when electric power is interrupted
Solution Approach 1:
The patent creates a universal starting device that combines both electronic control functionality and mechanical backup functionality. The system can operate in electronic control mode when power is available, providing automated timing and control. When power is interrupted, it automatically switches to mechanical operation mode where the contact arm restriction mechanism physically prevents inadvertent operations. This multi-functionality ensures continuous productivity across different power conditions.
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 solution effectively prevents inadvertent driving operations and ensures consistent performance by eliminating heat's impact on the timer mechanism, allowing the tool to function even without electric power, thus providing a stable and reliable operation.
Implementation Method 1
a resistance applying member that intermittently applies a rotational resistance to the restriction wheel
Data Source
AI summary
A contact restriction member is configured to move from an unlock position to a lock position within a predetermined time period by using an intermittent rotation movement of a restriction wheel. The contact restriction member may prevent substantial movement of a contact arm when the contact restriction member is in the lock position.