Pivoting Assembly for Hand Tool Without Pin Holes
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Solution Overview
Problem
Conventional foldable wrenches with pivotally connected stems suffer from reduced strength due to holes for pin insertion, limiting their ability to apply high torque when turning objects.
Innovation Solution
A pivoting assembly for a hand tool with first and second stems connected without a pin, utilizing a positioning device and biasing member to ensure the stems remain engaged, maintaining strength and allowing for high torque application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If holes are formed at the two stems to insert a pin for pivotal connection, then the stems can be pivotally connected with each other, but the strength of the tool is decreased
Solution Approach 1:
The patent removes the pin and holes from the conventional foldable wrench design. Instead of using a pin inserted through holes to connect the driving stem and handle, the invention uses a spherical joint structure where the handle directly articulates with the driving stem without requiring holes or separate fastening elements, thereby maintaining full structural strength.
Solution Approach 2:
The patent integrates the connection function directly into the stem structures themselves. The spherical joint is formed by combining a spherical surface on one stem with a corresponding socket on the other stem, merging the connection mechanism into the stems rather than using separate components like pins and holes.
2Volume of moving object
If a conventional foldable structure is used allowing the driving stem to fold in parallel with the handle, then the tool occupies compact storage space, but the user must repeatedly disengage and reposition the handle to turn fasteners in limited spaces
Solution Approach 1:
The patent transforms the rigid foldable structure into a dynamic articulated structure. The spherical joint allows the handle to move freely in multiple directions and angles relative to the driving stem, enabling continuous adjustment during operation without requiring disengagement and repositioning.
Solution Approach 2:
The patent changes the angular parameters of the connection between handle and driving stem. Instead of being constrained to a fixed folding angle, the spherical joint allows variable angles and orientations, enabling the handle to be positioned optimally for accessing fasteners in tight or awkward spaces while maintaining compact storage when folded.
3Device complexity
If only one end of the wrench is used as the driving tool, then the structure is simple, but a different driving stem must be connected and reassembled when different torque or fastener depth is required
Solution Approach 1:
The patent makes both ends of the wrench functional by allowing either the driving stem end or the handle end to serve as the driving tool. The spherical joint configuration enables either end to be positioned in the fastener, providing versatility for different torque requirements and fastener depths without requiring additional tools or reassembly.
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 allows for high torque application without stem disengagement, maintaining tool strength and enabling versatile angle adjustments from 0 to 90 degrees, preventing the need for repositioning and reassembly.
Implementation Method 1
a biasing member (31) abutted and biased against the engaging member (32)
Data Source
AI summary
A pivoting assembly for a hand tool includes first and second stems pivotally connected with each other, and a positioning device. The first stem includes first and second jaw portions extending from an end thereof. An opening is formed between the first and second jaw portions. An inner periphery surface is formed between the first and second jaw portions. An aperture is extended in the inner periphery surface. The second stem includes at least one arm portion extending from an end thereof. An engaging portion is formed at an end of the arm portion. The engaging portion is engaged with the first and second jaw portions. The positioning device is received in the aperture and abutted against the engaging portion of the second stem.