Switch Boot Sealing with Intermediary Bearing Member
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Solution Overview
Problem
Conventional switch boots face premature failure due to excessive stresses and wear caused by direct contact with threaded bushings, which vary in axial projection, leading to inadequate sealing and reduced longevity.
Innovation Solution
A switch boot design featuring a resilient elastomeric material with a bearing member of lesser flexibility, positioned between the threaded bushing and the boot's wall, prevents direct contact and accommodates axial variations by allowing displacement, while a cavity within the mounting nut secures the boot independently of the panel nut, ensuring effective sealing without compromising the boot's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the resilient material of the switch boot directly engages with the threaded bushing to accommodate variations in axial projection, then some compensation for variations is achieved, but excessive stresses are induced in the switch boot material tending to rupture the switch boot and cause undue galling and wearing away of the material
Solution Approach 1:
A bearing member is introduced as an intermediary component between the threaded bushing and the resilient switch boot material. The bearing member has a bearing surface that contacts the threaded bushing, while the resilient material contacts the bearing member, preventing direct engagement between the threaded bushing and resilient material. This intermediary structure allows the resilient material to accommodate axial variations without direct stress concentration from the threaded bushing, thereby maintaining both adaptability and reliability.
2Adaptability or versatility
If the resilient material of the switch boot is stretched to compensate for variations in axial projection of the threaded bushing, then accommodation of different installations is achieved, but excessive wear and galling occur on the surfaces contacted by the threaded bushing
Solution Approach 1:
The bearing member serves as a mediator that separates the threaded bushing from the resilient material. The bearing member's rigid structure prevents direct contact between the threaded bushing and resilient material, eliminating galling and excessive wear on the resilient material surfaces. Meanwhile, the resilient material can still stretch to accommodate axial variations by contacting the bearing member's surface, preserving adaptability while extending service life.
3Adaptability or versatility
If the switch boot is designed to accommodate variations in threaded bushing projection, then broader applicability to existing installations is achieved, but the effectiveness of the seal and integrity of the switch boot are compromised
Solution Approach 1:
The bearing member acts as an intermediary that protects the resilient material from direct contact with the threaded bushing, preventing degradation that would compromise seal effectiveness and boot integrity. The bearing member's stable structure ensures consistent performance across variations in threaded bushing projection, maintaining both adaptability and reliability of the sealing function.
Solution Approach 2:
Different portions of the switch boot structure are assigned different properties: the bearing member is made of rigid material to provide stable contact surfaces and prevent wear, while the boot material remains resilient to accommodate axial variations and provide sealing. This local differentiation of material properties allows the structure to simultaneously achieve adaptability and maintain integrity of the seal.
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 enhances seal longevity, ease of installation, and accommodates various switch configurations, preventing premature failure and maintaining an effective seal over an extended service life.
Implementation Method 1
the boot member including a lower basal section, an upper apical section and an intermediate section between the basal section and the apical section... displacement of the apical section relative to the basal section is enabled in the axial direction
Data Source
AI summary
A sealing device and method are disclosed for use in connection with a switch mounted upon a panel by a panel nut engaged with a threaded bushing projecting from the panel. A boot member of a resiliently flexible elastomeric material is placed over the switch and is secured by a mounting nut to the threaded bushing to establish a seal. An annular bearing member is interposed between the terminal end of the threaded bushing and a juxtaposed portion of the boot member so as to protect the juxtaposed portion from damage that might otherwise occur as a result of any direct contact between the terminal end of the threaded bushing and the juxtaposed portion of the boot member.