Spray Gun Trigger Retaining Shaft Elastic Biasing
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Solution Overview
Problem
The existing spray gun designs face issues with trigger mounting, requiring specialized tools for removal and replacement, leading to potential loss of snap rings, looseness due to production tolerances, and difficulty in using a single gun main body width on different spray guns, resulting in increased costs and aesthetic issues with asymmetrical snap rings.
Innovation Solution
The design incorporates a shaft portion with a first retaining shaft and a second retaining shaft, both locked rotatably on the trigger, and an elastic member to bias them away from each other, allowing easy mounting and removal of the trigger, absorbing production tolerances, and enabling common use across different gun main body widths without the need for snap rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a snap ring is used to secure the trigger on the shaft portion, then the trigger can be retained on the gun main body, but a special tool is needed to remove the snap ring and there is possibility that the snap ring may be lost
Solution Approach 1:
The snap ring is completely removed from the trigger mounting structure. Instead of using a snap ring to secure the trigger, the patent uses a simple insert-type shaft portion that is pushed into the gun main body through a through hole, eliminating the need for special removal tools and preventing loss of small components.
Solution Approach 2:
The trigger mounting structure is designed to be self-contained and self-securing. The shaft portion with the trigger is inserted as a complete assembly through the through hole and secured by the elastic member, allowing easy removal without requiring external tools or complex disassembly procedures.
2Reliability
If locking portions are formed to be inclined towards each other to reduce looseness, then production tolerance variation can be partially compensated, but looseness recurs after continuous use
Solution Approach 1:
The shaft portion is designed with an elastic member that provides dynamic adjustment capability. The elastic member can compensate for production tolerance variations and maintain proper clearance during continuous use, allowing the trigger to adapt to wear and dimensional variations over time rather than relying on fixed inclined locking portions.
Solution Approach 2:
The elastic member changes the physical state of the mounting interface by providing elastic deformation and dynamic clearance adjustment. This allows the system to accommodate production tolerance variations and maintain stable operation throughout the product lifecycle without the looseness that occurs with rigid inclined locking portions.
3Reliability
If different trigger-related parts are prepared for different gun main body widths to eliminate looseness, then trigger stability is improved, but cost increases due to inability to common use gun main bodies
Solution Approach 1:
The shaft portion is designed with a standardized through hole configuration that can be universally applied across different gun main body widths. The elastic member provides the necessary adjustment range to accommodate various widths, allowing a single trigger assembly design to work on multiple gun main body types without requiring custom modifications.
Solution Approach 2:
The trigger mounting system is segmented into modular components: the shaft portion with through holes, the elastic member, and the trigger assembly. This segmentation allows each component to be independently designed and adjusted, enabling universal compatibility across different gun main body widths while maintaining proper trigger stability.
4Reliability
If an irregular shaped snap ring is used, then the trigger can be secured, but the appearance is deteriorated due to asymmetry
Solution Approach 1:
The irregular-shaped snap ring is completely removed from the design. The trigger retention function is achieved through a simple insert-type shaft portion pushed through a through hole and secured by an elastic member, eliminating the need for visible snap rings and improving the overall appearance while maintaining reliable trigger retention.
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 ensures reliable and easy mounting of the trigger, absorbs production tolerances, allows common use across different gun main body widths, and improves the design aesthetics by eliminating the need for snap rings and reducing looseness.
Implementation Method 1
an elastic member disposed in the mounting hole to bias the first retaining shaft in a direction in which the first retaining shaft exits from the mounting hole
Data Source
AI summary
There is provided a spray gun comprising: a gun main body; and a trigger having a first locking portion and a second locking portion, the first locking portion locked at one end of a shaft portion provided on the gun main body, the second locking portion locked at the other end of the shaft portion, the trigger operable to rotate about the shaft portion, wherein the shaft portion comprises: a first retaining shaft disposed in a mounting hole formed in the gun main body and locked rotatably on the first locking portion of the trigger; and an elastic member disposed in the mounting hole to bias the first retaining shaft in a direction in which the first retaining shaft exits from the mounting hole.