Dental Handset Bit-Holding Mechanism with Interlocking Splits
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Solution Overview
Problem
Conventional bit-holding mechanisms in dental high-speed handsets suffer from insufficient connecting strength between the holder barrel and push button, leading to loose bit fixation, which can be hazardous during dental procedures and requires increased precision and material quality to enhance stability, thereby increasing costs.
Innovation Solution
A press-type bit-holding mechanism featuring a hollow rotary shaft with a hexagonal abutting section and a push button with interlaced splits and projecting posts, along with a holder barrel having complementary splits and projecting posts, ensures secure frictional locking and prevents relative rotation between components, allowing for robust bit fixation and easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the holder barrel is simply drivingly connected with the push button via the linking section, then the device complexity is reduced, but the connecting strength becomes insufficient leading to loose bit fixation
Solution Approach 1:
The patent employs asymmetric interlocking features including projecting posts on one component and complementary recesses on the other, creating an asymmetric connection that provides superior mechanical strength while maintaining reasonable structural complexity. This asymmetric design ensures the holder barrel and push button are firmly located against relative displacement.
2Ease of operation
If the holder barrel and push button are not firmly located, then the ease of operation is improved for bit replacement, but the reliability of bit fixation deteriorates causing safety hazards
Solution Approach 1:
The patent implements a dynamic pressing mechanism where the push button can be depressed to retract the holder barrel from the rotary shaft, enabling easy bit replacement. The interlocking features maintain firm fixation during normal operation but allow controlled disengagement when the push button is actuated, thus achieving both ease of operation and reliability.
3Reliability
If the connecting strength is enhanced by improving dimension precision and material quality, then the reliability of bit fixation is improved, but the manufacturing cost increases
Solution Approach 1:
The patent divides the connection system into distinct segments with specific interlocking features (projecting posts and complementary recesses). This segmentation allows each component to be manufactured with standard tolerances while achieving reliable fixation through the geometric interlocking, avoiding the need for high-precision machining or expensive materials.
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 mechanism provides a more secure and reliable bit-holding system that enhances the longevity of the bit-holding mechanism, ensuring precise bit placement and easy bit replacement, while maintaining cost-effectiveness by improving the structural interlock without the need for high-precision materials.
Implementation Method 1
a frictional section adjacent to the second coupling section, the frictional section having a thickness larger than that of the second coupling section
Data Source
AI summary
A press-type bit-holding mechanism of a dental high-speed handset, including a hollow rotary shaft, a push button accommodated in the hollow rotary shaft and a holder barrel also accommodated in the hollow rotary shaft. The push button has a first coupling section formed with two opposite splits and two opposite first projecting posts. The first projecting posts and the splits are interlaced with each other. The holder barrel has a second coupling section has two second splits and two second projecting posts complementary to the first splits and the first projecting posts of the first coupling section of the first coupling section of the push button.