Presta Pump Chuck Locking Seal for One-Handed Inflation
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Solution Overview
Problem
Current pump chucks for Presta valve inflation are difficult to use, requiring significant force and two hands to engage, often leading to leaks, damage, and premature seal degradation due to friction and improper attachment.
Innovation Solution
A pump chuck design featuring a valve engagement device with a radially movable aperture and a locking mechanism that allows single-handed operation with minimal force, using a serpentine track and pin system to lock the seal in place, eliminating the need for two-handed operation and reducing seal wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber disc seal is used to create an air seal with the Presta valve, then an air-tight seal can be achieved, but the seal degrades over time due to friction and repeated stretching
Solution Approach 1:
The patent changes the sealing mechanism from friction-based (rubber disc stretched over valve) to compression-based (conical seal pressed against flat surface). This parameter change in the sealing approach eliminates repeated stretching and friction, thereby extending seal service life while maintaining air-tight reliability
Solution Approach 2:
Instead of stretching the seal outward over the valve tip (conventional approach), the invention inverts the approach by having the seal compress inward against a flat surface when the valve is inserted. This inversion eliminates the degrading friction and stretching cycles
2Reliability
If high force is applied along the longitudinal axis to push the rubber disc into sealing position, then an air-tight seal can be achieved, but this requires two-handed operation and can result in bending or damage to the valve
Solution Approach 1:
The patent inverts the sealing approach: instead of pushing the seal outward along the valve axis (causing bending risk), the seal is compressed inward perpendicular to the valve axis. This allows single-handed operation without applying longitudinal force to the valve
Solution Approach 2:
The invention extracts the sealing action from the longitudinal axis of the valve. The sealing force is applied perpendicular to the valve body through the conical mechanism, separating the sealing function from the valve insertion direction and eliminating the need for counter-torque
3Reliability
If the pump chuck is rotated 90 degrees to lock the seal in place, then a secure connection is achieved, but this introduces resultant torque that can bend or damage the valve
Solution Approach 1:
Instead of rotating the chuck to achieve locking (which creates torque), the invention inverts the approach by using a cam mechanism that locks through linear motion and geometric constraint. The cam's curved surface converts minimal rotational input into a locking position without applying bending torque to the valve
Solution Approach 2:
The cam mechanism acts as an intermediary between the locking lever and the seal positioning. It translates a small lever movement into a secure locked position through its curved geometry, eliminating the need for 90-degree rotation and the associated harmful torque
4Ease of operation
If the rubber disc is made smaller to fit through the aperture, then the chuck can be attached to the valve, but the disc must be stretched creating friction and degradation
Solution Approach 1:
The patent inverts the size relationship: instead of the seal being smaller and stretching to fit, the seal is larger and compresses when locked. The conical geometry ensures the seal contacts the valve tip before full insertion, creating a secure seal without stretching or friction
Solution Approach 2:
The invention changes the sealing parameter from tension (stretched rubber) to compression (compressed conical seal). This parameter change allows the seal to be larger than the aperture without stretching, maintaining both ease of attachment and seal integrity
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 enables easy, one-handed attachment and removal of the pump chuck with minimal air loss, reducing seal degradation and eliminating the need for two-handed operation, ensuring a secure air-tight seal and broad applicability to various lever-equipped tools.
Implementation Method 1
a resilient sealing element disposed within the valve guide and movable radially with respect to the central axis to compress and form an air-tight seal around the Presta valve
Implementation Method 2
a cam rod slidably disposed within the chuck body, wherein the at least one end of the cam rod is pushed by the locking lever to move toward the valve guide when the locking lever is rotated from an unlocked position to a locked position
Data Source
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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.