Telescopic Wrench Sleeve Structure for Stable, Quiet Adjustment
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Solution Overview
Problem
Existing telescopic wrenches suffer from structural weakness and operational noise due to reduced contact area between the outer sleeve and inner tube during length adjustment, leading to potential loosening and interference from foreign objects.
Innovation Solution
A telescopic wrench design featuring an outer sleeve with a first and second hole securely connected to an inner rod via an elastic ring, enhancing structural strength and incorporating a deformable elastic ring to provide smooth operation and reduce noise, while maintaining contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the outer sleeve and inner tube slide axially to extend the wrench length, then the overall length increases, but the contact area between outer sleeve and inner tube decreases
Solution Approach 1:
The inner rod is nested within the outer tube, with the rod section sliding through the passage of the outer tube. This nested configuration allows the wrench to extend in length while maintaining a compact structure when retracted, and ensures continuous contact between the sliding surfaces of the inner rod and outer tube throughout the extension range.
2Length of moving object
If the contact area decreases during extension, then the wrench can be extended, but structural strength becomes insufficient due to force concentration
Solution Approach 1:
The nested configuration ensures that the inner rod remains surrounded by the outer tube throughout the extension range, maintaining continuous contact and force distribution across the sliding surfaces, preventing force concentration even when extended.
Solution Approach 2:
The second hole in the outer sleeve provides peripheral contact with the rod section in a radial dimension, creating an external auxiliary fitting structure that distributes forces across multiple contact points and dimensions, enhancing structural strength during operation.
3Length of moving object
If the contact area decreases during extension, then the wrench can be extended, but loosening and operational noise increase
Solution Approach 1:
The nested configuration maintains continuous contact between the inner rod and outer tube throughout the extension range, preventing loosening and reducing operational noise through consistent surface contact.
Solution Approach 2:
The second hole provides additional peripheral contact in a radial dimension, creating multiple contact points that stabilize the connection between outer sleeve and inner rod, preventing loosening and reducing noise during operation.
4Ease of operation
If the elastic ring is compressed, then it provides smooth and dampened operation, but the device complexity increases
Solution Approach 1:
The elastic ring changes its physical state from uncompressed to compressed during operation, providing smooth and dampened movement through elastic deformation. This simple parameter change (compression) achieves the desired operational quality without requiring complex mechanisms.
Solution Approach 2:
The elastic ring automatically provides damping and smooth operation through its inherent elastic properties when compressed, without requiring external control systems or complex mechanisms. The component serves itself by utilizing its material properties to achieve the desired effect.
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 design improves structural integrity and reduces operational noise, ensuring stable length adjustment and protection against foreign object interference.
Implementation Method 1
The elastic ring can undergo deformation under compressive forces, providing a smooth and dampened manual operation when adjusting the length of the telescopic wrench
Data Source
AI summary
A telescopic wrench includes an outer tube, an outer sleeve, and an inner rod. The first hole of the outer sleeve ring is fitted onto the outer tube, and the second hole of the outer sleeve provides peripheral contact with the rod section of the inner rod. The outer sleeve forms an external auxiliary fitting structure with the inner rod and outer tube. The telescopic wrench provides an improvement over known structures that are prone to loosening and noise during use. The telescopic wrench enhances the structural strength when subjected to operating forces.