Pivotable Head Screwing Tool for Multi-Size Hex Nuts
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Solution Overview
Problem
Conventional screwing tools are limited in their ability to accommodate multiple wrench sizes due to fixed torque transmission edge distances, restricting their versatility and effectiveness in handling different screw head sizes.
Innovation Solution
A screwing tool design featuring two pivotable heads with adjustable torque transmission edges, where each head has a distinct minimum distance between its jaws, allowing for the accommodation of hex nuts or screw heads with three or four different wrench sizes by varying the distance between the torque transmission edges, and a spring mechanism to maintain the heads in specific pivoting positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distance between torque transmission edges is fixed, then the structural design is simple, but the tool can only handle one wrench size
Solution Approach 1:
The head is designed to be pivotable relative to the handle, allowing the distance between torque transmission edges to be dynamically adjusted. The head can assume different angular positions around the pivot axis, each corresponding to a specific wrench size, thereby transforming a static structure into a dynamic one that adapts to multiple fastener sizes
Solution Approach 2:
A single head structure is designed to perform multiple functions by accommodating different wrench sizes. Through the pivotable mechanism, one head can serve as multiple specialized heads, each optimized for a specific wrench size, eliminating the need for multiple separate tools
2Adaptability or versatility
If the head is made pivotable to adjust torque transmission distance, then multiple wrench sizes can be handled, but the torque application precision may be reduced
Solution Approach 1:
The head is pre-configured with specific stop positions that correspond to predetermined wrench sizes. Before actual use, the head can be positioned and locked into these pre-calibrated stops, ensuring that the torque transmission geometry is already optimized for the selected fastener size, thereby maintaining precision despite the adjustable nature of the tool
3Force
If the force application point is moved farther from the head, then greater torque is generated, but the control precision over the head pivoting decreases
Solution Approach 1:
The handle acts as an intermediary element between the user's applied force and the head pivoting action. By providing a substantial handle length, the tool allows force to be applied at a distance to generate sufficient torque, while the handle itself serves as a control lever that enables precise manipulation of the head's angular position, thus mediating between the conflicting requirements of torque magnitude and control precision
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 tool can double the number of wrench sizes it can handle by adjusting the distance between the torque transmission edges, enhancing its versatility and usability with hexagonal profiles of varying sizes.
Implementation Method 1
a spring element is provided that holds the head in the first stop position
Implementation Method 2
The narrow side of the head thus forms a lever extension that is pivotably associated with the handle
Data Source
Figure 1~3
AI summary
The invention relates to a screwing tool, comprising an elongate handle (1) which, at each of the two ends (1', 1'') thereof, bears a head (2, 3) pivotable about a pivot axis (4, 5) and having two torque transmission flanks (15, 16) in each case and has a force application flank (6, 7) for introducing a force in order to produce a torque on the head (2, 3) remote from the relevant force application flank (6, 7), wherein, in a pivoting end position of the head (2, 3), in which a stop (8) of the head (2, 3) lies against a counter stop (9) of the handle (1), a narrow side (10, 11) of the head (2, 3) functionally directed away from the stop (8) forms an extension of the force application flank (6, 7). The second head (2, 3) forms an extension of the force application flank (6, 7) and can be used as a hand grip.