Marked Hoist-Actuating Switch with Protective Window
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Solution Overview
Problem
Conventional hoist control switches face issues with the stability of visual indicators under environmental influences and operating forces, leading to potential incorrect operation and safety risks due to detachment or twisting of symbols.
Innovation Solution
A hoist control switch design featuring a flexible, rotationally symmetrical cap with a transparent window for the optical symbol, providing protection against environmental influences and secure attachment of the symbol, along with optional backlighting for improved visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a symbol is glued to the cap using high-performance adhesive, then the symbol provides visual indication for the switch function, but the adhesive bond deteriorates under heat, sunlight, and chemical exposure causing the symbol to detach or twist
Solution Approach 1:
A transparent window made of chemically resistant material (such as acrylic or polycarbonate) is introduced as an intermediary between the adhesive bond and the environmental factors. The window is bonded to the cap with adhesive, while the symbol is printed directly on or attached to the window's inner surface. This intermediary protects the adhesive bond from heat, sunlight, and chemical exposure, preventing detachment and twisting while maintaining visual indication functionality.
2Ease of operation
If the cap is made from a one-piece flexible rubber material, then the cap provides elasticity and tight sealing, but the surface of the cap deforms under operating forces affecting symbol readability
Solution Approach 1:
The cap is segmented into two distinct parts: a flexible rubber base cap that provides elasticity and sealing, and a rigid transparent window that carries the symbol. The window is bonded to the rubber base, creating a composite structure where each material performs its optimal function. The rigid window maintains symbol position stability while the flexible rubber base continues to provide ease of operation and sealing.
3Object-affected harmful factors
If the optical symbol is made visible through the transparent window, then the symbol remains protected from environmental influences, but the visibility may be reduced in low light conditions
Solution Approach 1:
The optical symbol is designed with high-contrast color schemes that enhance visibility through the transparent window. Signal colors such as bright yellow, orange, or fluorescent materials are used for the symbol against a darker background on the window surface. This color optimization ensures the symbol remains highly visible through the transparent window even in low light conditions, while the window continues to protect the symbol from environmental degradation.
Data Source
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AI summary
The invention relates to a hoist-actuating switch (7), comprising a switch housing (5) and a plurality of switch elements (1), wherein each switch element comprises a substantially cylindrical switch plunger (12) guided in a sleeve (10) in a rotationally fixed manner; a push button (14) that is acted upon by the switch plunger (12), preferably by the underside (16) thereof; an optical mark (20) that is mounted on the upper end face (18) of the switch plunger (12); a rotation-symmetrical cap (24) that is at least partially flexible and has a connection opening (27) to one side, which covers the upper end of the switch plunger (12), and the inner surface (36) of which rests thereon. In the region of the bearing surface, the cap (24) has a window (28) made of a transparent material, by way of which the optical mark (20) is visible through the window (28) from the outside and is shielded from environmental influences.