Intermediate Striker Guide for Pneumatic Power Tool
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Solution Overview
Problem
Existing hand-held power tools with pneumatic striking mechanisms face issues with tilting of the intermediate striker during empty strikes, leading to inefficient deactivation of the striking mechanism.
Innovation Solution
The design incorporates a guide with a first and second sliding surface that maintains contact with the intermediate striker at all positions, ensuring the striker is guided coaxially, with varying guide lengths to prevent tilting, and includes a sealing ring for air-tight and dust-tight sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the guide length is long to guide the intermediate striker during operation, then the guidance stability is improved, but the guide structure becomes more complex and the striker cannot be properly deactivated after empty strike
Solution Approach 1:
The guide is divided into two distinct sliding surfaces: a first sliding surface for guiding the intermediate striker during normal operation, and a second sliding surface for deactivating the striking mechanism after empty strikes. This segmentation allows each surface to be optimized for its specific function, with the second surface being shorter and positioned to enable proper striker retraction and mechanism deactivation.
Solution Approach 2:
The intermediate striker itself acts as a mediator between the two sliding surfaces. Its dual-role design with different radial dimensions at different sections allows it to interact with both the first sliding surface (for stable guidance during operation) and the second sliding surface (for deactivation after empty strikes), resolving the contradiction between long guide length and proper mechanism deactivation.
2Manufacturing precision
If the intermediate striker is guided throughout its entire length, then the guidance precision is improved, but the ability to tilt and deactivate the striking mechanism is reduced
Solution Approach 1:
Different sections of the intermediate striker have different radial dimensions and are guided differently. The first section with larger radial dimension is guided by the first sliding surface for precision during operation, while the second section with smaller radial dimension interacts with the second sliding surface to enable tilting and deactivation. This local differentiation of guidance quality resolves the contradiction between overall guidance precision and deactivation capability.
3Device complexity
If the sliding surfaces are short, then the guide structure is simpler, but the intermediate striker may tilt during operation reducing reliability
Solution Approach 1:
The solution adds the dimensional aspect of radial dimension variation along the axial length of the intermediate striker. By having different radial dimensions at different sections and corresponding different sliding surfaces at different positions along the working axis, the system achieves both sufficient guidance length for stability and appropriate guide length for deactivation, resolving the contradiction between guide length and reliability.
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 configuration ensures reliable deactivation of the striking mechanism during empty strikes by minimizing tilting and maintaining air-tightness, enhancing operational efficiency and tool longevity.
Implementation Method 1
a pneumatic striking mechanism. The striking mechanism has an exciter (12) driven by the motor (5) along a working axis (10)
Implementation Method 2
a striker (13) coupled to the exciter (12) via an air cushion
Implementation Method 3
a sealing ring (43) is arranged on the second sliding surface (29). The second sliding surface (29) and the second section (22) of the intermediate striker (16) are preferably sealed with each other so as to be air-tight and dust-tight
Data Source
AI summary
The hand-held power tool has a tool socket, a motor and a pneumatic striking mechanism. The striking mechanism has an exciter driven by the motor along a working axis, a striker coupled to the exciter via an air cushion, and an intermediate striker arranged between the striker and the tool socket in the striking direction. The striking mechanism also has a guide in which the intermediate striker is guided. The guide has a first sliding surface that guides a first section of the intermediate striker, and a second sliding surface that is arranged offset relative to the first sliding surface in the striking direction and that guides a second section of the intermediate striker. A radial dimension of the first section of the intermediate striker is greater than a radial dimension of the second section of the intermediate striker.