Pneumatic Tool Direction Switching via Arc Trajectory Control
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Solution Overview
Problem
Existing pneumatic tools face issues with inexact direction switching due to long control members, high assembly and production costs, and discomfort during operation due to complex and large operation angles in prior designs.
Innovation Solution
A rotation direction switching device with a valve sleeve, intake valve, and control member that uses a pivot shaft for arc trajectory movement, reducing the number of components and operation angle, and incorporating a limiting rib and indentation for precise alignment, allowing for forward and reverse rotation control with less effort and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control member moves linearly to drive the intake valve to rotate, then the direction switching function is achieved, but the control member length becomes too long causing discomfort and inexact control
Solution Approach 1:
The control member is designed to move along a curved arc trajectory rather than a linear path, pivoting around the pivot shaft. This curved motion path allows the control member to be shorter while still achieving the necessary angular displacement of the intake valve for direction switching, thereby improving control accuracy and reducing finger discomfort.
2Reliability
If prior direction switching mechanisms are designed with complex structures, then direction control function is achieved, but assembly cost and production cost increase
Solution Approach 1:
The control member integrates multiple functions: it serves as both the actuator and the linkage mechanism, pivoting around the pivot shaft while directly driving the intake valve. This merging of functions eliminates the need for separate complex linkage components, reducing device complexity and production cost while maintaining reliable direction switching control.
3Ease of operation
If the direction switching mechanism has a large operation angle, then forward and reverse rotation switching is achieved, but the mechanism protrudes too much causing discomfort
Solution Approach 1:
By designing the control member to pivot along a curved arc around the pivot shaft, the mechanism achieves the necessary rotation direction switching within a compact space. The curved motion path allows the mechanism to remain close to the tool body without excessive protrusion, improving user comfort while maintaining effective direction control.
Data Source
AI summary
A rotation direction switching device of a pneumatic tool includes a valve sleeve, an intake valve and a control member disposed in a tool body. Under a condition that a pivot connecting portion of the control member is pivotally connected to a pivot shaft of the tool body and each driving portion of the control member can drive a driven portion of the intake valve, the control member can drive the intake valve in an arc trajectory to rotate, so that when the control member is in the forward or the reverse rotation control position, the vent of the intake valve is in communication with corresponding one of clockwise and the reverse rotation holes of the valve sleeve, so as to control the pneumatic tool to rotate forward or reversely. Therefore, the assembly cost and production cost can be effectively reduced.