Washer-Equipped Screw Projection Locking Flat Washer
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Solution Overview
Problem
Existing washer-equipped screws with flat and rubber washers face issues with the flat washer detaching due to frictional forces, especially during automated assembly processes, and there is a risk of both washers detaching when the rubber washer is inserted.
Innovation Solution
Incorporating a projection on the cylindrical portion of the screw body that engages with the flat washer to prevent detachment, and a groove for the rubber washer to enhance securement, ensuring the washers remain in place even without the rubber washer, with the diameter of the cylindrical portion being slightly larger than the flat washer to facilitate easy insertion but prevent detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flat washer is secured only by frictional force against the shaft portion, then the structure is simple, but the flat washer may detach during assembly or use
Solution Approach 1:
A projection is formed on the cylindrical portion of the screw body before assembly, which preliminarily prepares an engagement structure that will mechanically lock the flat washer in place during the assembly process, preventing detachment before the rubber washer is installed
Solution Approach 2:
The projection on the cylindrical portion acts as an intermediary mechanical feature between the screw body and the flat washer, providing a positive engagement structure that mediates the connection and prevents washer detachment without requiring complex additional components
2Productivity
If the flat washer is pushed through the shaft portion during automated assembly, then assembly speed is high, but the flat washer may detach before the rubber washer is inserted
Solution Approach 1:
The projection is pre-formed on the cylindrical portion to create a stopping mechanism that will engage the flat washer during automated assembly, ensuring the washer is securely positioned before the rubber washer insertion step completes the assembly
Solution Approach 2:
The projection structure enables the flat washer to self-lock during the pushing process through automated assembly, where the washer's own movement through the shaft portion triggers engagement with the projection, eliminating the need for separate securing operations
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 projection effectively locks the flat washer, preventing it from detaching, and the groove secures the rubber washer, reducing the risk of both washers detaching during assembly, ensuring stable fixation of circuit boards or other components.
Implementation Method 1
A projection for engagingly locking the flat washer is disposed on the cylindrical portion
Implementation Method 2
The washer-equipped screw pressed down a circuit board by an elastic force of the rubber washer. A thermal deformation of the circuit board can also be absorbed by the elastic force of the rubber washer
Data Source
AI summary
A washer-equipped screw is provided with a screw body, a flat washer, and a rubber washer. The screw body includes a cylindrical portion between a shaft portion on which a screw groove is formed and a head portion. A hole in the flat washer is inserted through the cylindrical portion so as to be adjacent to the head portion. A hole in the rubber washer is inserted through the cylindrical portion and positioned on a shaft portion side of the flat washer. The cylindrical portion is provided with a projection for engagingly locking the flat washer. An inner edge of the flat washer is caught by the projection, whereby the flat washer is prevented from detaching.