Antenna Attachment Washer Geometry for Secure Temporary Fastening
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Solution Overview
Problem
Conventional antenna attachment mechanisms face issues with operability during assembly, as they can cause the male screw to fall out or become obliquely caught, and lack a reliable temporary fastening function, leading to potential detachment of the antenna device from the vehicle.
Innovation Solution
The antenna attachment includes a male screw part with a cylindrical intermediate portion and a washer featuring overlapping holes of different sizes, allowing the screw to be easily inserted and aligned, preventing oblique catching and enhancing operability by reducing contact with screw locking agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protrusions are provided on the inner periphery of the through-hole to prevent the male screw from falling out, then the male screw can be retained in the fixing metal fitting, but the male screw may become obliquely caught causing poor emplacement properties
Solution Approach 1:
A guide portion is introduced as an intermediary element between the male screw and the through-hole protrusions. The guide portion has a smaller diameter than the through-hole, allowing it to pass through freely and guide the male screw into proper alignment before the larger-diameter screw body engages with the protrusions for retention.
Solution Approach 2:
The male screw is segmented into two functional portions: a guide portion with smaller diameter for easy insertion and alignment, and a screw body with larger diameter for engagement and retention. This segmentation allows each portion to fulfill its specific function without compromising the other.
2Reliability
If a screw locking agent is applied to the male screw threads to provide temporary fastening function, then the antenna device is prevented from detaching, but the screw locking agent may be scratched and come off by the protrusions
Solution Approach 1:
The guide portion acts as an intermediary that passes through the through-hole before the screw body engages with the protrusions. This sequence ensures that the screw locking agent on the threads is not disturbed during the insertion process, as the guide portion (which passes through first) has a smaller diameter that avoids contact with the threaded portion.
Solution Approach 2:
The guide portion performs the preliminary action of passing through the through-hole and positioning the male screw before the screw body engages with the protrusions. This preliminary positioning action occurs before any potential scratching could happen, preserving the screw locking agent integrity.
Data Source
AI summary
An antenna attachment including: a male screw part to be screwed with an antenna main body of an antenna device to be installed on a moving body, the male screw part including a head portion, a thread portion, and an intermediate portion between the head portion and the thread portion having a cross section smaller than the head portion and the thread portion; and a washer including a hole portion allowing passage of part of the male screw part. The hole portion has a shape in which a first hole and a second hole having different sizes are overlapped. The first hole has a shape not allowing passage of the head portion and the thread portion and allowing passage of the intermediate portion. The second hole has a shape not allowing passage of the head portion and allowing passage of the thread portion and the intermediate portion.