Metal Elevator Pushbutton Housing for Frequent Disinfection
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Solution Overview
Problem
Elevator pushbutton devices with plastic components are prone to damage from frequent disinfection, leading to operational failures and the need for repairs or replacements.
Innovation Solution
A monolithic one-piece metal injection molded elevator pushbutton device with a guide housing and actuating element, featuring fastening wings and a design that minimizes disinfectant ingress and ensures secure attachment to electronic switches, using metal components that maintain operability even with frequent disinfection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic components are used in the elevator pushbutton device, then the device can be manufactured with ease and lower cost, but the components are damaged by frequent disinfection leading to operational failures
Solution Approach 1:
The patent changes the material parameter from plastic to metal (specifically stainless steel), which fundamentally alters the chemical resistance properties. Metal materials are inherently more resistant to disinfectant chemicals, allowing the pushbutton device to withstand frequent disinfection without degradation, thus resolving the reliability issue while maintaining manufacturability through established metal forming processes
Solution Approach 2:
The guide housing is constructed as a composite structure combining metal injection molded components with integrated rubber seals and coating layers. This composite approach provides both the chemical resistance of metal and the sealing properties of rubber, creating a durable assembly that resists disinfectant damage while maintaining operational reliability
2Reliability
If metal components are used in the elevator pushbutton device, then the components withstand frequent disinfection, but the manufacturing complexity increases
Solution Approach 1:
The patent merges multiple components into a single monolithic guide housing structure made via metal injection molding. The guide housing integrates the housing body, fastening wings, and mounting features into one piece, eliminating the need for separate metal housing components and reducing assembly steps. This consolidation reduces overall device complexity despite using metal materials
Solution Approach 2:
The metal guide housing serves multiple functions simultaneously: it provides structural support, chemical resistance to disinfectants, magnetic coupling surfaces for actuator attachment, and integrated fastening features. This multi-functionality reduces the need for separate components, thereby reducing overall device complexity while maintaining reliability
3Object-affected harmful factors
If the actuating element top surface is aligned with the guide housing top surface, then disinfectant ingress is minimized, but the design precision requirements increase
Solution Approach 1:
The patent introduces a flexible rubber seal element between the actuating element and guide housing that creates a liquid-tight barrier. This flexible seal compensates for minor misalignments and manufacturing tolerances, preventing disinfectant ingress without requiring extremely tight alignment precision, thus resolving the contradiction between sealing effectiveness and manufacturing feasibility
Solution Approach 2:
The rubber seal acts as a pre-installed protective barrier that cushions against potential disinfectant intrusion. By providing this protective layer in advance, the design tolerates slight misalignments while still preventing harmful factor ingress, eliminating the need for ultra-precise manufacturing
Data Source
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AI summary
The invention relates to an elevator pushbutton device (1) comprising a guide housing (2) and an actuating member (3) disposed within the guide housing (2), wherein the guide housing (2) is provided with fastening wings (4), the guide housing (2) and the actuating member (3) are made of metal, and the guide housing (2) is a monolithic one-piece metal injection molded component.