Hand Tool Relief Device Radial Actuation
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Solution Overview
Problem
Existing hand-held power tools face difficulty in loosening the clamping nut due to it tightening during operation, requiring complex relief mechanisms that are not compact or economically viable.
Innovation Solution
A compact relief device with an actuating element that can be manually pressed radially inward to reduce the axial extent, featuring a T-shaped actuating element with a mold recess and spring bias, allowing for easy unscrewing of the clamping nut by reducing the axial extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the clamping nut is tightened during operation, then the tool clamping force is improved, but the clamping nut cannot be loosened or requires great difficulty to loosen
Solution Approach 1:
The relief device is divided into functional segments: actuating element, adjusting body, and clamping body, each performing a specific function in the loosening sequence. This segmentation allows the complex loosening operation to be broken down into manageable mechanical steps that reliably reduce axial extension.
Solution Approach 2:
The relief device performs preliminary action by mechanically reducing the axial extension of the clamping nut before the actual loosening operation. The adjusting body is displaced in advance to create the necessary clearance, making the subsequent loosening operation feasible and easy.
2Ease of operation
If existing relief devices are designed to loosen the clamping nut, then the ease of operation is improved, but the device complexity increases and manufacturing cost rises
Solution Approach 1:
The relief device functionality is merged into the existing clamping nut structure. The actuating element, adjusting body, and clamping body are integrated components that work together within the compact space of the clamping assembly, avoiding the need for separate external relief mechanisms.
Solution Approach 2:
The clamping nut serves multiple functions: it provides clamping force during operation and simultaneously houses the relief device mechanism for loosening. The same structural components perform both clamping and relief functions, reducing overall device complexity.
3Device complexity
If the axial extent of the relief device is reduced for compact design, then the device complexity is reduced, but the ability to loosen the clamping nut is compromised
Solution Approach 1:
The relief mechanism operates in the radial dimension rather than requiring extensive axial space. The actuating element moves radially to drive the adjusting body, allowing the relief function to be achieved within a compact axial envelope while maintaining full loosening capability.
Solution Approach 2:
The relief device components are nested within each other and within the clamping nut structure. The actuating element, adjusting body, and clamping body are arranged in a nested configuration that minimizes axial extension while preserving the complete loosening function.
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
Enables easy and efficient loosening of the clamping nut with reduced axial extension, improving tool operation and design compactness while minimizing friction and wear.
Implementation Method 1
a spring element, in particular a spiral spring, is provided which is supported on the outside against the central sleeve-shaped section of the first functional part on the one hand and against the actuating element on the other hand
Implementation Method 2
The adjusting body has a round or rounded cross-section and is, in particular, designed to be essentially cylindrical, columnar or spherical. Due to the round or rounded cross-section, when the actuating element is actuated, the adjusting body rolls from the first position into the second position on the actuating element until it engages with the mold recess. This reduces friction and wear.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The device has a drive spindle provided with a tool flange for fixing a rotary drivable planar tool. A releasing device (4) exhibits a set of functional parts (8, 10), where a clamping body (12) and an adjusting body (14) are arranged between the functional parts. An axial distance between the functional parts is determined by the clamping body and the adjusting body. An actuating element (18) is actuated in radial direction with respect to the drive spindle by manual radially inward aligned pressure for reduction of axial extension of the releasing device.