Handheld Power Tool Torque Reaction Housing Design
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Solution Overview
Problem
Conventional power tools face challenges in handling reaction torque, leading to operator strain, safety risks, and inflexibility due to the need for reaction arms that can cause pinching or crushing injuries and require adaptation to specific applications, especially in spaces where space is limited.
Innovation Solution
A handheld power tool design that incorporates a housing adapted to bear against the workpiece surface, with a nut socket mechanism that generates axial force proportional to applied torque, utilizing friction torque to absorb reaction torque, eliminating the need for reaction bars and reducing the risk of injuries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional reaction arms are used to absorb reaction torque, then operator strain is reduced, but the risk of pinching or crushing injuries increases
Solution Approach 1:
The invention extracts the reaction torque absorption function from external reaction arms and integrates it into the tool housing itself. The housing is designed to bear against the workpiece surface, eliminating the need for separate reaction arms that pose safety risks. This extraction principle resolves the contradiction by removing the harmful external component while retaining the beneficial torque absorption function.
Solution Approach 2:
The invention introduces friction between the housing and workpiece surface as an intermediary mechanism to absorb reaction torque. Instead of direct mechanical contact through reaction arms, the friction interface acts as a mediator that converts reaction torque into frictional force, thereby eliminating pinching risks while maintaining operator comfort.
2Reliability
If reaction arms are used to handle high torque, then operator safety is improved, but device complexity and space requirements increase
Solution Approach 1:
The invention merges the reaction torque absorption function with the tool housing structure. The housing serves dual purposes: containing the tool components and providing the reaction surface against the workpiece. This merging eliminates separate reaction arms, reducing device complexity while maintaining safety through friction-based torque absorption.
Solution Approach 2:
The housing is designed with multi-functionality, serving both as the tool's structural enclosure and as the reaction torque absorption mechanism. This universal design eliminates the need for application-specific reaction arms, reducing overall device complexity while maintaining operator safety across various tightening applications.
3Force
If reaction arms are adapted to specific applications, then torque absorption effectiveness is improved, but adaptability and flexibility decrease
Solution Approach 1:
The invention employs a dynamic friction-based mechanism where the reaction force is generated through friction between the housing and workpiece surface. This dynamic interaction automatically adapts to different workpiece surfaces and geometries, providing effective torque absorption across various applications without requiring application-specific adaptations, thereby maintaining high versatility.
Solution Approach 2:
The friction-based mechanism allows the reaction torque absorption to adapt to different working conditions by changing the friction parameters naturally. The contact pressure and friction coefficient adjust according to the specific workpiece and application, providing effective torque absorption across diverse scenarios without requiring mechanical adaptation of the tool structure.
4Power
If reaction arms are used in limited spaces, then high torque tightening is enabled, but space requirements and accessibility increase
Solution Approach 1:
The invention nests the reaction torque absorption function within the tool housing itself, eliminating external reaction arms that would require additional space. The housing contains all necessary components and provides the reaction surface, allowing high torque tightening in compact configurations and limited spaces while maintaining full torque capability.
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 design provides a compact, versatile, and safe solution for handling reaction torque, allowing one-handed tightening of high torque fasteners, reducing operator strain, and preventing pinching or crushing injuries, while maintaining a constant margin against sliding during the tightening process.
Implementation Method 1
The mechanism is an axial cam mechanism such that a relative rotation between the first and second element results in a change in the axial distance between the first and second element
Implementation Method 2
enabling the generation of a friction torque which in turn absorbs the reaction torque
Data Source
Figure 1a
Figure 1b~2
AI summary
Hand held power tool adapted to apply a torque to a bolt, comprising a rotatable input shaft, a housing comprising an end surface oriented normal to the input shaft and adapted to selectively bear against a surface of a work piece, a radially protruding element arranged on the input shaft and bearing against a shoulder formed in the housing such that an axial force may be transferred from the shaft to the housing, a socket adapted to engage a bolt protruding from the work piece such that a force may be exerted on the bolt by the socket, and a mechanism connecting the socket and the input shaft, wherein the mechanism is adapted to selectively provide a force pressing the end surface of the housing against the work piece surface when torque is applied to the bolt, wherein the axial force is proportional to the torque applied.