Bicycle Switch Viewing Window Scratch Resistance
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Solution Overview
Problem
Existing bicycle gear shift switches are often expensive and complex, with display devices that are not easily legible and prone to damage, lacking a clear and variable information display that is resistant to scratches and external influences.
Innovation Solution
A twist grip switch with a viewing window made of scratch and impact-resistant transparent thermoplastic material, surrounded by a protective frame, featuring a snap-on connection to the housing and a film with transparent numbers and symbols for improved visibility, along with a pointer that moves under the display to indicate gear positions, and optional reflective luminous colors or lighting for enhanced visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional display device is used, then the switch can indicate gear positions, but the display is not easily legible and prone to damage
Solution Approach 1:
The patent changes the material parameter of the viewing window from traditional glass or plastic to transparent thermoplastic material with specific physical properties (scratch resistance, impact resistance, temperature stability). This parameter change directly addresses the durability and scratch sensitivity issues while maintaining display functionality.
Solution Approach 2:
The viewing window is constructed as a composite structure combining transparent thermoplastic material with a protective frame made of plastic material. This composite approach provides both the required transparency for display and the mechanical strength for durability, resolving the contradiction between legibility and resistance to damage.
2Loss of information
If a complex display device is used, then clear information can be displayed, but the switch becomes expensive and complex
Solution Approach 1:
The display device is segmented into separate functional elements: the viewing window (transparent thermoplastic material), the film with numbers and symbols, and the pointer. This segmentation allows each component to be optimized independently and simplifies the overall structure while maintaining clear gear position indication.
Solution Approach 2:
Instead of using complex mechanical display mechanisms, the patent uses a simplified visual copying system where the pointer position on a simple scale with numbers and symbols directly indicates the gear position. This copying approach provides clear information without requiring complex mechanical or electronic systems.
3Illumination intensity
If the viewing window is made transparent for visibility, then gear positions are clearly visible, but the window becomes more susceptible to scratches and damage
Solution Approach 1:
The patent changes the material parameters of the viewing window by selecting transparent thermoplastic material that simultaneously provides high transparency for visibility and enhanced scratch and impact resistance. This parameter change resolves the contradiction between visibility and durability.
Solution Approach 2:
The protective frame made of plastic material acts as an intermediary protective layer surrounding the transparent viewing window. This frame provides additional mechanical protection against scratches and impacts while not interfering with the transparency and visibility function of the window itself.
Data Source
Figure 1~2
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AI summary
The switch (1) has a housing (2) with a protrusion (15) along a handle bar. The protrusion forms large area for a display device (3). A pointer (14) follows a rotary motion of a switching ring in the display device that is covered and closed by a view window (11). The protrusion freely extends over the handle bar. The view window is surrounded by a protective frame at an outer edge, where the protective frame is made of elastic plastic.