Pneumatic Tool Timer Piston Pressure Compensation
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Solution Overview
Problem
Pneumatic tools driven by compressed air face challenges in stabilizing timekeeping due to fluctuations in air pressure and sliding resistance, making it difficult to consistently deactivate the main valve after a predetermined time without an external power source or precise sealing mechanisms.
Innovation Solution
A pneumatic tool design incorporating a timer piston, cylinder, and on-off valve system that uses compressed air to cancel sliding resistance and maintain consistent operation, featuring a shaft portion that moves in conjunction with the timer piston to switch the control valve's operation after a predetermined time, independent of air pressure and sliding resistance fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a timekeeping mechanism using air pressure is applied, then a power supply and circuit are not required, but the timekeeping cannot be stably performed due to pressure fluctuation
Solution Approach 1:
The patent applies counterbalancing force through a spring mechanism that opposes the air pressure force on the timer piston. The spring force increases as the piston moves, compensating for fluctuations in air pressure and maintaining stable timekeeping without requiring electrical power supply and circuits.
Solution Approach 2:
The patent changes the physical parameters of the timekeeping system by introducing a spring with specific elastic properties. The spring constant and pre-compression are designed to counterbalance the varying air pressure forces, transforming the system from pressure-dependent to spring-force-balanced operation.
2Reliability
If compressed air is used to operate the on-off valve part, then sliding resistance is canceled and timekeeping becomes stable, but the device complexity increases
Solution Approach 1:
The patent makes the compressed air supply system multi-functional by using it for both the drive part operation and the timer piston operation. The same compressed air source that powers the pneumatic tool also provides the counterbalancing force for stable timekeeping, eliminating the need for separate power supply systems.
Solution Approach 2:
The patent merges the drive air supply system with the timer air supply system. Both the drive piston and timer piston are operated by compressed air from the same source, combining multiple functions into a unified pneumatic system that reduces overall device complexity.
3Reliability
If an electric timer is used for timekeeping, then stable timekeeping can be achieved, but a power supply and circuit are required
Solution Approach 1:
The patent replaces the electrical timekeeping system with a mechanical pneumatic system. Instead of using an electric timer that requires power supply and circuits, the invention uses a timer piston operated by compressed air with spring counterbalancing, achieving stable timekeeping through mechanical means suitable for pneumatic tools.
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 ensures stable timekeeping and consistent operation of the pneumatic tool by canceling the effects of air pressure and sliding resistance fluctuations, allowing for reliable deactivation of the main valve, thus improving operational reliability and precision.
Implementation Method 1
a timer piston configured to move in one direction and perform timekeeping
Implementation Method 2
compressed air flowing into the on-off valve part presses the shaft portion in the one direction
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A pneumatic tool (1) includes a drive part (2) configured to be driven by compressed air, a control valve (5) configured to switch the presence or absence of operation of the drive part, and a timer part (8) configured to switch the presence or absence of operation of the control valve after a lapse of a predetermined time. The timer part includes a timer piston (80) configured to move in one direction, a timer piston cylinder configured to support the timer piston such that the timer piston can slide, and an on-off valve part (87) configured to switch the presence or absence of operation of the control valve in conjunction with the timer piston. The on-off valve part includes a shaft portion configured to move in conjunction with the timer piston, and compressed air flowing into the on-off valve part presses the shaft portion in the one direction.