Dental Handpiece Jacket Fixation via Engagement Groove
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Solution Overview
Problem
Conventional dental handpieces experience loosening of screws during use, leading to reduced operability and aesthetic issues due to exposed screws on the casing.
Innovation Solution
A dental handpiece design that fixes the jacket in the grip casing using a reliable engagement mechanism, comprising a circumferential groove and slot, with an engagement rod and nut, or an annular member with elastic balls, to secure the jacket without screws, enhancing durability and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screw is used to fix the jacket in the front casing portion, then the jacket can be securely fixed, but the screw loosens during use causing the handpiece to shake and the appearance to be impaired
Solution Approach 1:
The screw is completely removed from the fixation mechanism. Instead of using a screw to fix the jacket, the patent employs an engagement groove structure where the jacket itself engages with the front casing portion through a groove formed in its circumferential surface, eliminating the need for separate fastening elements that can loosen.
Solution Approach 2:
The engagement groove is divided into multiple segments or portions along the circumferential direction. This segmented groove structure allows the jacket to be securely fixed at multiple points around its circumference, providing reliable fixation without requiring a single large screw that could loosen.
2Reliability
If a screw is used to fix the jacket, then the jacket can be secured, but the exposed screw impairs the appearance of the handpiece
Solution Approach 1:
The visible screw element is completely extracted from the design. The fixation is achieved through the engagement groove structure that is either concealed within the casing or designed as an integrated feature of the jacket itself, eliminating any exposed fastening elements that would compromise the aesthetic appearance.
Solution Approach 2:
The fixation function is merged with the structural design of the jacket and casing. The engagement groove is formed as an integral part of either the jacket or the front casing portion, combining the fastening function with the structural and aesthetic elements rather than being a separate visible component.
Data Source
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AI summary
A dental handpiece is disclosed which comprises a grip section having a head section in which a treatment tool is detachably attached, and a drive section detachably connected thereto. The grip section comprises a casing having front and rear casing portions, with the front casing portion being continuous to the rear casing portion at an angle; a first rotary shaft rotatably supported in the rear casing portion, a cylindrical jacket extending from the head section and arranged and fixed in the front casing portion toward the first rotary shaft, and a second rotary shaft rotatably supported in the jacket, and operatively connected to the treatment tool at one end and to the first rotary shaft at the other end via a gear. The driving force from the drive section is transmitted by means of the first and second rotary shafts to the head section to drive the treatment tool. The jacket is provided with an engagement groove on its circumferential surface. The grip section further comprises engaging means disposed in the rear casing portion and detachably engaging the engagement groove on the jacket, wherein the jacket arranged in the front casing portion is fixed therein by means of engagement of the engagement groove on the jacket and the engaging means in the rear casing portion.