Dispenser Guide Shaft Lever Mechanism for Fine Adjustment
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Solution Overview
Problem
Existing dispensers for dental viscous materials lack fine adjustment capabilities for the direction and position of material ejection, resulting in suboptimal operability.
Innovation Solution
The dispenser design incorporates a guide shaft, slide block, and piston shafts with a lever mechanism that allows for precise control over the ejection of viscous materials by utilizing a combination of springs and frictional forces to facilitate forward and rearward movement, enabling adjustable ejection and improved handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lever is operated to squeeze the lever together with the case member, then the piston rod is moved to dispense material, but it is difficult to finely adjust the direction and position of the ejected material
Solution Approach 1:
The device is divided into functionally independent modules: a lever mechanism for dispensing activation, a guide shaft for directional control, and a cartridge for material storage. This segmentation allows the guide shaft to be independently adjusted without affecting the lever operation, enabling fine adjustment of ejection direction while maintaining operational simplicity.
Solution Approach 2:
The guide shaft is designed to be movable relative to the case member, transitioning between a fixed state during material ejection and an adjustable state for direction/position fine-tuning. This dynamic design allows the system to switch between precise control mode and adjustment mode, resolving the contradiction between ease of operation and adjustability.
2Ease of operation
If the guide shaft is made movable to enable fine adjustment, then operability is improved, but the device structure becomes more complex
Solution Approach 1:
The guide shaft is nested within the case member, with the cartridge mounted on the guide shaft. This nested arrangement allows the guide shaft to move independently within the case member's cavity while maintaining a compact overall structure. The lever mechanism operates externally without interfering with the internal nested components, minimizing structural complexity while enabling adjustability.
Solution Approach 2:
The guide shaft acts as an intermediary component between the lever mechanism and the cartridge. It transmits the lever's dispensing action while providing an independent adjustment function for direction and position. This intermediary role allows the guide shaft to mediate between the simple lever operation and the precise ejection control, adding adjustability without significantly increasing overall device complexity.
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
This design enhances operability by allowing users to finely adjust the direction and position of ejected materials and improves ease of use, including cartridge replacement and reduced leakage during non-operation.
Implementation Method 1
a first elastic member which urges the guide shaft in the rearward direction
Implementation Method 2
a second elastic member which urges the guide shaft in the rearward direction
Implementation Method 3
when a frictional force between the guide shaft and the release plate is greater than a pushing force of the piston shafts
Data Source
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AI summary
A dispenser includes a guide shaft, a housing, accommodating the guide shaft, and supporting the guide shaft movably frontward and rearward along an axial direction, a slide block slidably mounted on the guide shaft, a piston shaft having one end mounted on the slide block, and another end projecting from the housing as the slide block moves frontward, a handle projecting from the housing, a slide bar having one end rotatably supported on the housing, and another end approaching the handle when rotated, and an engaging piece provided on the one end of the slide bar and engaging a guide groove formed in the guide shaft, wherein the engaging piece moves the guide shaft frontward when the other end of the slide bar is rotated to approach the handle due to an operation of a user.