Driving Tool Resetting Assembly Pneumatic Control
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Solution Overview
Problem
Existing driving tools require additional valves for resetting from bump firing to single shot mode, which can lead to malfunctions and undesired activations, and their structure is not simplified.
Innovation Solution
The driving tool integrates the resetting assembly with the actuator unit, using a pneumatic coupling to activate the resetting assembly during the driving-in cycle, eliminating the need for additional valves and simplifying the structure by utilizing a pneumatically adjustable control element that interacts with the triggering assembly based on pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate valve is provided for activating the resetting assembly, then the resetting function can be achieved, but the structure becomes more complex and malfunctions may occur
Solution Approach 1:
The patent merges the resetting assembly with the actuator unit by integrating the resetting piston directly into the actuator cylinder. The resetting piston shares the same cylindrical space as the actuator piston, eliminating the need for separate valves and resetting mechanisms. This integration simplifies the overall structure while maintaining reliable resetting functionality through pneumatic coupling during the driving-in cycle.
2Ease of operation
If additional valves are used for mode transfer, then the resetting from bump firing to single shot mode can be controlled, but the tool structure is not simplified and malfunctions may occur
Solution Approach 1:
The actuator cylinder serves multiple functions: it acts as both the actuator chamber for driving-in cycles and the control volume for the resetting assembly. The same pneumatic pressure that drives the actuator piston also activates the resetting piston, eliminating the need for separate control valves. This multi-functionality simplifies the tool structure while maintaining ease of operation through the triggering assembly.
3Loss of time
If a separate resetting assembly with control volume is provided, then the delay time control can be achieved, but the structure becomes more complex with additional components
Solution Approach 1:
The control volume for delay time control is integrated into the actuator cylinder itself. The resetting piston moves within the same cylindrical space as the actuator piston, and the pneumatic pressure control is achieved through the existing triggering assembly and air supply system. This integration eliminates separate control volumes and valves, simplifying the structure while maintaining precise delay time control through the air-venting opening.
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 ensures reliable transfer from bump firing to single shot mode without additional valves, preventing malfunctions and simplifying the tool's structure, while maintaining efficient operation.
Implementation Method 1
The driving tool in question may be designed as a compressed-air-operated driving tool
Implementation Method 2
The control volume is provided with an air-venting opening, which allows slow venting of the air. If the pressure goes below a limit value, this has the effect after a predetermined delay time of transferring the driving tool into the single shot mode.
Implementation Method 3
the resetting assembly being coupled to the actuator unit in such a way that, in the bump firing mode, a driving-in cycle activates the resetting assembly
Data Source
AI summary
A driving tool for driving fasteners into a workpiece and operable in a single shot mode and in a bump fire mode, wherein the driving tool includes a resetting assembly including a control volume, wherein the resetting assembly is activatable in the bump fire mode by movement of a piston during each fastener driving-in cycle so that a fluid path from a cylinder to the control volume facilitates an increase in pressure to the control volume, and wherein responsive to a pressure in the control volume falling below a limit value due to venting of air from the control volume, the resetting assembly is operable to prevent actuation of a workpiece contact element from causing a valve piston to move to an actuation position until a trigger lever is released.