Trigger Sprayer Spring Fatigue via Curved Lever Surface
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Solution Overview
Problem
Conventional trigger-type liquid sprayers fatigue easily due to excessive deformation of the spring member when the operation lever is swung widely for spraying a large amount of liquid, leading to reduced durability.
Innovation Solution
The trigger-type liquid sprayer incorporates a spring member with a fixed part located in front of the operation lever's swing center and an inclined surface on the operation lever, which reduces the movement range and deformation of the spring member by allowing the projection to move backward while moving relatively forward with the inclined surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the operation lever is swung widely to spray a large amount of liquid, then the spraying quantity is increased, but the spring member undergoes excessive deformation and becomes fatigued easily
Solution Approach 1:
The inclined surface is designed as a curved surface rather than a flat plane. When the projection contacts the curved inclined surface, it allows the spring-side projection to move backward while the lever-side projection moves forward, reducing the relative displacement between the two projections and thereby reducing spring deformation while maintaining wide lever swing capability for large spraying quantities
Solution Approach 2:
The invention changes the geometric parameters of the spring member by repositioning the spring-side projection backward and modifying the inclined surface curvature. This parameter change allows the spring to accommodate large lever swings with reduced deformation amplitude, maintaining reliability while enabling high spraying quantity operation
2Adaptability or versatility
If the spring member is designed to accommodate large lever swing range, then the spraying capacity is improved, but the spring member deformation increases and fatigue occurs
Solution Approach 1:
The curved inclined surface enables the spring member to adapt to large lever swing ranges by converting linear displacement into a combination of backward movement of the spring-side projection and forward movement of the lever-side projection. This curvature-based mechanism maintains spring strength by reducing deformation amplitude while preserving full lever swing adaptability
Solution Approach 2:
The invention introduces dimensional complexity by allowing the spring-side projection to move not only with the lever swing but also independently backward along the curved inclined surface. This multi-dimensional movement pattern enables the spring to accommodate large swing ranges without excessive deformation, preserving strength while enhancing adaptability
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 configuration reduces the fatigue of the spring member and the force required to swing the operation lever, enhancing the durability and efficiency of the sprayer.
Implementation Method 1
When the operation lever 103 is swung backward, a back end part of the lever-side projection 106 presses a front wall of the spring-side projection 105 to elastically deform the spring member 104, so that the operation lever 103 is urged forward by elastic force generated by the elastic deformation
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3
AI summary
There is provided a trigger-type liquid sprayer in which a spring member urging an operation lever is less likely to be fatigued. A trigger-type liquid sprayer according to the present invention includes a sprayer main body (2) attached to a container (A), an operation lever (4) held to be swingable in a front-back direction with respect to the sprayer main body (2), and a spring member (5) urging the operation lever (4) forward. The spring member (5) includes a fixed part (5d) that is located in front of a swing center (C) of the operation lever (4) and is fixed and held to the sprayer main body (2), and a projection (5e) that is located below the fixed part (5d). The operation lever (4) includes an inclined surface (4e) that is inclined upward from downward and frontward from backward and is urged by the projection (5e) abutting against the inclined surface (4e).