Dual-Mode Valve Cap with Rotating Screw Mechanism
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Solution Overview
Problem
Conventional dual-mode valve caps for Schrader and Presta valves are complex, large, and prone to disconnection during inflation operations.
Innovation Solution
A compact dual-mode valve cap design featuring a rotating device with opposing heads for grasping, a valve block, and a spring member to securely engage both valve types, ensuring stable air passage and preventing accidental disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional dual-mode valve caps use parallel American and French valves with a lever and rubber socket mechanism, then both valve types can be accommodated, but the structure becomes complicated and size increases
Solution Approach 1:
The rotating device serves multiple functions: it provides screw holes for both Presta and Schrader valves, contains the valve block and spring member mechanism, and enables mode switching through rotation. This multi-functional design eliminates the need for separate parallel valve bodies and complex switching mechanisms, resolving the contradiction between versatility and structural complexity
Solution Approach 2:
The valve block is nested within the accommodation chamber of the rotating device, and the spring member is mounted within the same chamber. This nested arrangement consolidates multiple components into a compact configuration, reducing overall device complexity while maintaining dual-mode functionality
2Ease of operation
If conventional dual-mode valve caps use a lever to squeeze a rubber socket, then valve connection is achieved, but the device requires large operation space
Solution Approach 1:
The complex lever and rubber socket mechanism is extracted and replaced with a simpler screw-connection system. The valve block with its seal ring directly engages with the valve through threading, eliminating the need for lateral squeezing operations and reducing the space required for manual operation
3Ease of operation
If conventional dual-mode valve caps use a rubber socket seizure mechanism, then valve connection is achieved, but accidental disconnection occurs during inflation
Solution Approach 1:
The spring member is pre-mounted in the accommodation chamber to automatically exert pressure on the valve block when the valve is screwed in. This preliminary positioning ensures the seal ring is already in place and ready to seal, preventing accidental disconnection during inflation operations
Solution Approach 2:
The spring member acts as a cushioning element that maintains continuous pressure on the valve block and seal ring throughout the inflation process. This beforehand cushioning ensures the connection remains secure and prevents accidental disconnection, improving reliability while maintaining ease of operation
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 design provides a simple, compact, and secure connection for both Schrader and Presta valves, reducing the risk of disconnection and ensuring stable air passage, even in low-light conditions, with a screw-connection mechanism that allows for easy verification by touch.
Implementation Method 1
a spring member mounted in the accommodation chamber of the rotating device and stopped between an inner end wall of the screw hole of the rotating device for Presta (French) valve and an inner end wall of the valve block to impart a pressure to the valve block
Data Source
AI summary
A Schrader (American) valve /Presta (French) valve dual-mode valve cap includes a casing having an axle hole and a through hole kept in communication, a rotating device rotatably mounted in the axle hole and having two opposing heads respectively disposed outside the axle hole with a respective screw hole defined therein for the connection of a Schrader (American) valve or Presta (French) valve, an accommodation chamber in communication between the two screw holes, an annular air passage defined in between the rotating device and the casing, a through hole in communication with the annular air passage and the accommodation chamber and two seal rings mounted on the periphery thereof at two sides of the annular air passage, a valve block movable back and forth in the accommodation chamber and having a seal ring mounted on the periphery thereof to divide the accommodation chamber into two spaces, and a spring member stopped between the valve block and a part of the rotating device to force the valve block toward the screw hole for Schrader (American) valve.