Sequential Trigger Valve for Fastener Driving Tools
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Solution Overview
Problem
Conventional fastener driving tools lack a simple structure for a single driving system that allows sequential operation of the push lever and trigger to drive a second fastener after the initial driving operation, requiring significant changes to the trigger valve configuration.
Innovation Solution
A fastener driving tool with a cylinder and sleeve valve system that includes a main piston, valve piston, and plunger, allowing compressed air to be supplied and exhausted sequentially to drive the driver blade, enabling a full sequential trigger system where both the push lever and trigger are returned to initial positions before reoperation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a full sequential trigger system is implemented to enable single driving mode with push lever and trigger returned to initial positions, then the fastener driving tool achieves simplified structure and reliable sequential operation, but the trigger valve configuration requires significant changes
Solution Approach 1:
The trigger valve is segmented into multiple functional components: a valve body, a movable valve member, a push lever connected to the valve member, and a trigger mechanism. This segmentation allows each component to perform its specific function independently, enabling the push lever to control valve opening/closing and the trigger to control air supply/exhaust separately, thus achieving the full sequential trigger system while maintaining manufacturing feasibility
Solution Approach 2:
The valve member is preliminarily positioned in the closed state by the push lever before the trigger operation. When the push lever is pressed, it preliminarily closes the valve opening, preparing the system for the subsequent trigger operation that will supply compressed air to drive the fastener. This preliminary action ensures proper sequencing and simplifies the overall control logic
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
Enables a single driving mode where a second fastener can be driven without altering the basic structure of the trigger valve, ensuring efficient and sequential operation of the tool.
Implementation Method 1
a pressure accumulation chamber (31) configured to store compressed air and supply the compressed air to the main piston (14)
Implementation Method 2
a sleeve valve (33) switching between a state of supplying the compressed air to the main piston (14) and a state of stopping supply of the compressed air and exhausting the compressed air in the drive chamber (21)
Implementation Method 3
a main piston (14) provided with a driver blade (15) striking a fastener, and a cylinder (13) accommodating the main piston (14) such that the main piston (14) can freely reciprocate
Data Source
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AI summary
A fastener driving tool is provided which performs driving only when a trigger lever is turned ON following a push lever. The fastener driving tool includes a sleeve valve driving a driver blade, and in the sleeve valve, supply and exhaust of compressed air are controlled by a trigger valve 51. The trigger valve 51 includes a valve piston 61 movable between an air-supply position where the valve piston 61 causes an opening part 54 and a communication port 56 to communicate with each other and blocks an exhaust port 55, and an exhaust position where the valve piston 61 blocks the opening part 54 and causes the exhaust port 55 and the communication port 56 to communicate with each other, and a plunger 67 movable between a communication position where the plunger 67 causes compressed air in a pressure accumulation chamber to be supplied to a pressure chamber 66 and a shutoff position where the plunger 67 shuts off communication between the pressure accumulation chamber and the pressure chamber 66 and causes air in the pressure chamber 66 to be exhausted. When a trigger 41 and a push lever 44 are in striking stop positions, the plunger 67 is driven to a communication position by a trigger arm 76.