Dental Handpiece Chuck Mechanism Reducing Axial Runout
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Solution Overview
Problem
Existing chuck mechanisms for dental handpieces face issues with adequate elastic chuck function and axial runout, leading to difficulties in removing the rotary tool due to friction and accumulation of abrasion powder, which can cause pain during tooth cutting and hinder tool removal.
Innovation Solution
A chuck mechanism with an annular chucking member and elastic chucking pieces that securely fit the rotary tool to the rotor, allowing for radial deformation and secure locking, reducing axial runout and enabling easy tool removal by disengaging the chucking pawl from the locking groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the chuck device is positioned on the upper part of the upper bearing to provide adequate elastic function of the lock member, then the elastic function is adequately exerted, but the head part becomes bulky in the axial center direction
Solution Approach 1:
The chuck device is repositioned from the upper part of the upper bearing to the lower part of the lower bearing, utilizing the axial space in the opposite direction. This dimensional repositioning allows the lock member to have sufficient elastic deformation space without increasing the overall axial length of the head part, as the lower bearing area provides the necessary clearance for elastic function.
2Device complexity
If the circumscribed length of the rotor to the rotary tool is short, then the structure is compact, but axial runout occurs and abrasion powder accumulates making tool removal difficult
Solution Approach 1:
The patent introduces an elastic lock member that dynamically adjusts during tool attachment and removal. During attachment, the elastic lock member deforms to engage the locking groove; during removal, when the button is pressed, the elastic force reverses to facilitate disengagement. This dynamic elastic mechanism enables easy tool removal without requiring excessive circumscribed length, maintaining structural compactness while solving the removal difficulty caused by abrasion powder accumulation.
3Reliability
If friction between rotor and rotary tool is high, then secure holding is achieved, but abrasion powder accumulates causing pain and hindering tool removal
Solution Approach 1:
The holding function is segmented into two distinct mechanisms: (1) friction-based holding during rotation, where the fitted structure provides secure holding, and (2) elastic lock member-based locking for attachment/detachment. The elastic lock member engages with the locking groove to provide secure holding without excessive friction, thereby preventing abrasion powder accumulation while maintaining holding security during operation.
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 effectively reduces axial runout and friction, preventing abrasion powder accumulation, making it easier to remove the rotary tool and minimizing patient discomfort during dental procedures.
Implementation Method 1
an elastic chucking piece having a chucking pawl for elastically engaging with a locking groove
Data Source
AI summary
A chuck mechanism for a dental handpiece holds a columnar rotary tool for dental care rotatably with an annular rotor of the dental handpiece. The columnar rotor tool is concentrically detachable to the annular rotor which is rotatably attached to a head part of the dental handpiece. The chuck mechanism has an annular chucking member with a cylindrical base part into which the annular rotor is integrally fitted and an elastic chucking piece having a chucking pawl for engaging with a locking groove formed at a base end of the rotary tool. The chuck mechanism enables the rotary tool to be easily removed from the annular rotor by elastically deforming the elastic chucking piece against elastic force of the elastic chucking piece to disengage the chucking pawl from the locking groove.