Dental Foot Controller Cam Block Segmentation
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Solution Overview
Problem
Existing foot controllers for dental unit chairs do not linearly control the output of pneumatic treatment tools, leading to non-linear changes in revolutions per minute (RPM) of the handpiece, which results in the handpiece not outputting according to the operator's intention.
Innovation Solution
A foot controller with an air valve and a cam block having multiple inclined surfaces of different angles, which adjusts the flow rate of air supplied to the treatment tool, allowing for non-linear air supply and linear increase in RPM of the treatment tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cam block with a constant inclination upper surface is used, then the structure is simple, but the handpiece RPM changes non-linearly when air flow rate is adjusted
Solution Approach 1:
The cam block's upper surface is divided into multiple inclined surfaces with different inclination angles instead of using a single constant inclination surface. This segmentation allows different regions of the cam block to provide different rates of change for the rod position, thereby achieving linear RPM output across the full range of motion while maintaining structural simplicity.
2Ease of operation
If multiple inclined surfaces with different angles are used on the cam block, then linear handpiece output is achieved, but the device complexity increases
Solution Approach 1:
The upper surface of the cam block is segmented into multiple inclined surfaces with different inclination angles. Each segment handles a specific portion of the motion range, ensuring linear relationship between pedal input and handpiece RPM output throughout the entire operating range.
Solution Approach 2:
The cam block is designed with dynamic geometric features where the inclination angle changes along the surface. This dynamic geometry allows the mechanism to adapt the rate of rod displacement according to the position, achieving linear output characteristics without requiring complex external control systems.
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 foot controller achieves linear output of the pneumatic treatment tool, ensuring that the handpiece outputs according to the operator's intention, thereby improving the control and effectiveness of dental treatments.
Implementation Method 1
a cam block installed below a rod provided in the air valve and having a plurality of inclined surfaces having different inclination angles
Implementation Method 2
an air valve that controls a flow rate of air supplied to the treatment tool
Data Source
AI summary
An embodiment of the present invention provides a foot controller for a dental unit chair and a dental unit chair comprising same, wherein a foot controller for a dental unit chair for controlling a treatment tool provided in the dental unit chair comprises: an air valve for controlling the flow rate of air supplied to the treatment tool; a cam block that is installed under a rod provided in the air valve and has a plurality of inclined surfaces having different inclination angles; a pedal part that is disposed at a position spaced apart from the cam block by a predetermined distance and is capable of being rotated left and right and moved vertically by an external force; and a connecting part that connects the cam block and the pedal part so that the cam block moves in conjunction with the movement of the pedal part.