Presta Pump Chuck With Radial Locking for Leak-Free Attachment
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Solution Overview
Problem
Current pump chucks for Presta valve inflation are difficult to use, requiring significant force and two-handed operation, often leading to leaks, damage, and seal degradation due to friction and improper attachment.
Innovation Solution
A pump chuck design featuring a radially movable valve engagement device with a locking mechanism and a resilient sealing element that moves uniformly to create an air-tight seal without friction, allowing single-handed operation and easy attachment/removal with zero force required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber disc seal is deformed over the Presta valve tip to create an air-tight seal, then sealing effectiveness is improved, but the disc degrades over time due to repeated stretching and friction
Solution Approach 1:
Instead of deforming the seal over the valve tip, the invention inverts the approach by having the valve tip pass through the seal in a pre-formed hole. The seal remains stationary and undistorted during attachment, eliminating degradation while maintaining sealing effectiveness through the valve's interaction with the seal's inner surface.
Solution Approach 2:
The seal is pre-formed with a hole of appropriate diameter before use, eliminating the need for deformation during attachment. The valve tip simply passes through this pre-prepared opening, and sealing is achieved through the valve's interaction with the seal structure rather than through stretching.
2Reliability
If high force is applied along the longitudinal axis to push the rubber disc into sealing position, then seal engagement is achieved, but valve bending or damage occurs due to resultant torque
Solution Approach 1:
Instead of pushing the seal along the valve's longitudinal axis (which creates torque), the invention inverts the force direction. The valve passes through the seal laterally, and engagement is achieved through lateral movement and locking mechanism action rather than axial compression, eliminating torque-induced valve damage.
Solution Approach 2:
The invention introduces a locking mechanism as an intermediary between the user's hand and the seal engagement. The locking mechanism mediates the engagement process by controlling the valve's lateral movement through the seal, providing gradual engagement without sudden torque spikes that could damage the valve.
3Reliability
If the pump chuck requires two-handed operation to overcome friction and engage the seal, then sealing is achieved, but ease of operation deteriorates
Solution Approach 1:
The locking mechanism is designed to be self-actuating through a cam action. When the user inserts the valve and applies minimal lateral pressure, the cam mechanism automatically engages the locking arms, securing the seal without requiring the user to manually overcome friction or apply sustained force. The system serves itself by converting minimal user input into secure engagement.
Solution Approach 2:
The invention replaces the direct mechanical friction-based engagement system with a cam-based locking mechanism. Instead of relying on friction between the seal and valve to maintain engagement, the system uses mechanical advantage through the cam action to secure the seal with minimal user force, dramatically improving ease of operation.
4Reliability
If the rubber disc is repeatedly stretched during attachment and removal, then sealing is maintained, but friction degrades the disc resulting in poor seals and leaks over time
Solution Approach 1:
Instead of stretching the seal during each attachment cycle, the invention inverts the approach by having the valve pass through a pre-formed hole. The seal remains in its original, unstretched configuration throughout operation, eliminating the cumulative damage from repeated deformation while maintaining consistent sealing through the valve's interaction with the seal structure.
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 facilitates easy, single-handed operation with minimal force, reduces seal degradation, and prevents air loss during use, ensuring a reliable and durable air-tight seal.
Implementation Method 1
a resilient sealing element that moves uniformly to create an air-tight seal
Implementation Method 2
A biasing element can provide a lateral biasing force to the pin within the track
Data Source
AI summary
A chuck for inflating a tire having a Presta valve includes a valve engagement device defining an aperture with a central axis and a diameter, the valve engagement device movable radially with respect to the central axis to increase and decrease the diameter of the aperture. A locking device can engage with the valve engagement device to lock the valve engagement device in a selected radial position with respect to the central axis of the aperture. The chuck can include a seal positioned within the valve engagement device, the entire seal moving radially with the valve engagement device.