Dual-Holding Screw Tool for Stable Fastening in Confined Spaces
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Solution Overview
Problem
Existing fastening technologies, particularly for small screws used in confined spaces like dental medicine, face challenges in maintaining stability during handling due to shear and pull-off forces, leading to accidental detachment and loss of control, especially in oral implantology and bone fracture fixation.
Innovation Solution
A tool with a dual holding mechanism, featuring a first and second holding element, interacts with complementary elements on the screw head to ensure a stable, force-fitting connection through a combination of translational and rotational movements, preventing accidental detachment by guiding the engagement member through S-shaped channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple engagement member is used to hold the screw, then the device complexity is reduced, but the reliability of the connection deteriorates under shear and pull-off forces
Solution Approach 1:
The engagement member is divided into two functional segments: a first holding element (mandrel) that engages with S-shaped channels to prevent detachment, and a second holding element (polygonal interface) that provides rotational engagement. This segmentation allows each element to specialize in preventing specific failure modes, resolving the contradiction between simple structure and reliable connection.
Solution Approach 2:
The first holding element (mandrel) is nested within the engagement member shaft, while the second holding element (polygonal interface) is nested at the distal end. The S-shaped channels are nested within the screw head. This nested arrangement allows multiple holding functions to be integrated into a compact engagement member without significantly increasing overall complexity.
2Adaptability or versatility
If the screw dimensions are reduced for confined spaces, then the adaptability to confined spaces is improved, but the stability of the connection deteriorates
Solution Approach 1:
The S-shaped channels introduce a dimensional complexity to the engagement path that is not apparent from the simple cylindrical appearance of the engagement member. The mandrel must follow this three-dimensional S-shaped trajectory, which provides mechanical advantage and stability even when the overall dimensions of the screw and engagement member are small, thus resolving the contradiction between small size and connection stability.
3Strength
If a force-fitting connection is used, then the strength of the connection is improved, but the ease of operation deteriorates due to difficulty in maintaining stability
Solution Approach 1:
The S-shaped channels are pre-formed in the screw head, and the mandrel is pre-configured to engage with them. When the engagement member is inserted, the mandrel automatically follows the S-shaped path, preliminarily establishing a stable connection before any rotational or translational forces are applied. This preliminary engagement action ensures stability is maintained throughout the operation, resolving the contradiction between strong connection and ease of operation.
Data Source
AI summary
An arrangement with a tool and with a fastening means having a longitudinal direction is provided. The tool is designed to screw the fastening means into a body in the longitudinal direction; the tool has a blade with a first holding element and a second holding element; the fastening means has a first holding section with a complementary first holding element and a second holding section with a complementary second holding element. In the first holding section, the first holding element and the complementary first holding element interact in such a way that a translatory movement of the blade in the longitudinal direction is blocked. In the second holding section, the second holding element and the complementary second holding element interact in such a way that a rotary movement of the blade can be transferred to the fastening means and the fastening means can be screwed into the body.