Pneumatic Driving Tool Cylinder Weighting for Reaction Force Stability
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Solution Overview
Problem
Existing driving tools experience counterforces that cause deviations and instability during operation, leading to improper driving of members into workpieces due to the generation of reaction forces.
Innovation Solution
The driving tool incorporates an iron-made cylinder and a weight member positioned near the axis of the piston to stabilize the tool's balance and reduce reaction forces, along with a heat treatment to enhance the cylinder's intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the cylinder is made of aluminum or resin, then the weight of the driving tool is reduced, but the reaction force against the piston movement increases, causing the driving tool to rotate and deviate from the driving surface
Solution Approach 1:
The patent changes the material parameter of the cylinder from aluminum or resin to iron, which fundamentally alters the weight characteristic. This parameter change increases the local weight in the vicinity of the piston axis, thereby increasing the moment of inertia and reducing the impact of reaction forces on the driving tool's posture stability.
Solution Approach 2:
The patent applies local quality by making only the cylinder iron-made rather than the entire driving tool. This localized weight increase in the vicinity of the piston axis (as specified in the patent) is sufficient to stabilize the driving tool posture without requiring the entire tool to be heavy, thus balancing portability and stability.
2Manufacturing precision
If the cylinder is made of iron, then the reaction force against piston movement is reduced and driving accuracy is improved, but the weight of the driving tool increases
Solution Approach 1:
The patent implements local quality by restricting the iron material usage to the cylinder only, not the entire driving tool. The patent specifically states 'a weight in the vicinity of an axis line of the piston becomes large,' indicating localized weight concentration. This approach improves driving accuracy through increased stability while minimizing overall weight increase.
Solution Approach 2:
The patent changes the material parameter of the cylinder from lightweight materials (aluminum or resin) to iron, which has higher density. This parameter change directly addresses the driving accuracy issue by increasing the moment of inertia to reduce rotation caused by reaction forces, while the localized application limits the overall weight penalty.
3Productivity
If the piston moves quickly to increase productivity, then the reaction force increases and causes the driving tool to rotate, but slower movement reduces productivity
Solution Approach 1:
The iron-made cylinder acts as a counterweight that provides stabilizing moment to counteract the rotation caused by reaction forces during rapid piston movement. The increased weight in the vicinity of the piston axis creates a stabilizing effect that allows faster operation without sacrificing posture stability.
Solution Approach 2:
By changing the cylinder material to iron, the patent modifies the mass distribution parameter of the driving tool. This parameter change increases the moment of inertia, which reduces the angular acceleration caused by reaction forces, thereby maintaining posture stability even during high-speed operation that improves productivity.
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 stabilizes the driving tool's balance and reduces reaction forces, ensuring accurate and stable driving operations by maintaining weight balance and reducing deviations.
Implementation Method 1
Since the cylinder is made of iron, a weight in the vicinity of the axis line of the piston becomes large in comparison with a case where the cylinder is made of aluminum or resin. Because of large weight in the vicinity of the axis line of the piston, a reaction force against the movement of the piston and a driving of the driver can be restrained.
Data Source
AI summary
A driving tool includes a driver, and a piston connected to the driver. The piston and the driver are housed within a cylinder such that the piston slidably moves within the cylinder by gas active pressure. The cylinder is positioned in an adjoining arear of an axis line of the piston. The cylinder is made of iron. Accordingly, a weight in the adjoining arear of the axis line of the piston is more than a cylinder made of aluminum or resin. Because of the large weight in the adjoining area of the axis line of the piston, a reaction force against a movement of the piston and a driving of the driver can be effectively restrained.