Waterproof Bicycle End Cap Threaded Locking Design
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Solution Overview
Problem
Conventional bicycle end caps allow water accumulation and leakage, leading to rusting of the bolt and head tube, thereby shortening their service lives.
Innovation Solution
A waterproof end cap design featuring a threaded locking base with engaging plates, a locking member with a large and small-diameter portion, and a sealing cover with a slide groove and elastic press switch, eliminating water-holding spaces and gaps to prevent rusting and facilitate easy assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional end cap with bolt head receiving space is used to cover the head tube, then the end hole can be closed, but water accumulates in the bolt head receiving space and driving groove, causing leakage and rusting
Solution Approach 1:
The patent removes the bolt head receiving space and driving groove from the end cap structure, eliminating the cavities where water accumulates. The end cap is redesigned to have a flat, water-free surface that prevents water collection while still allowing the bolt to secure the end cap to the head tube.
Solution Approach 2:
The patent introduces a waterproof membrane or flexible sealing layer in the end cap structure to prevent water from penetrating through gaps between the bolt, end cap, and head tube. This flexible barrier effectively blocks water accumulation and leakage paths.
2Object-affected harmful factors
If the end cap structure is simplified to eliminate water-holding spaces, then water accumulation is prevented, but the structure may become less secure or functional
Solution Approach 1:
The end cap is divided into multiple functional components: a sealing layer to prevent water penetration, a securing mechanism (such as adhesive or mechanical interlocks) to attach the end cap to the head tube, and a decorative outer layer. This segmentation allows each component to perform its specific function optimally without compromising overall strength.
Solution Approach 2:
The end cap uses composite material construction combining waterproof materials (such as rubber or polymer coatings) with structurally strong materials (such as aluminum or steel). This composite approach ensures both water resistance and mechanical strength are achieved simultaneously.
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 solution effectively prevents water accumulation and leakage, extending the service life of the locking member and head tube while allowing flexible use of the end cap.
Implementation Method 1
An elastic member is provided between the press switch and the slide groove and pushes the press switch outward elastically
Implementation Method 2
the peripheral engaging plates 911 engaged with the inner wall of the head tube 80 to secure the threaded locking base 91 at a predetermined position
Implementation Method 3
The small-diameter portion extends into the end hole of the head tube, and the external thread of the small-diameter portion is threadedly connected with the threaded hole of the threaded locking base
Data Source
AI summary
A waterproof end cap for covering and closing an end hole of a bicycle head tube includes a threaded locking base, a locking member, and a sealing cover. The threaded locking base is engaged in the end hole. The locking member has large- and small-diameter portions. The end of the large-diameter portion that faces away from the small-diameter portion has an outwardly extending annular plate. The small-diameter portion is externally threaded, extends into the end hole, and threadedly connects with the threaded hole of the threaded locking to base such that the annular plate is pulled to cover the end hole. The sealing cover is larger than the annular plate in diameter and has opposite first and second sides. The first side is free of water-holding spaces. The second side covers the annular plate detachably through elastic engagement. Water can neither accumulate on nor leak through the sealing cover.