Air Pump Linkage Mechanism for Force Distribution
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Solution Overview
Problem
Many air pumps require steeply increasing forces towards the end of the pump stroke, making it difficult for users to achieve the necessary pressure, and often have small stroke volumes, necessitating dozens of strokes to pressurize a significant volume of air.
Innovation Solution
The design incorporates a cylinder, piston, piston rod, and three substantially rigid members with pivotable connections that transmit force from a handle to the piston, allowing for a more even force distribution and increased stroke volume without a corresponding increase in required force, achieved through a specific arrangement of pivots and members that reduce the force needed to generate high pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional pump designs are used, then the structure is simple, but the force required increases steeply toward the end of the pump stroke
Solution Approach 1:
The patent employs a dynamic linkage mechanism with three rigid members (first member, second member, third member) connected through pivot joints that change their configuration throughout the pump stroke. This dynamic arrangement transforms the force application profile, converting a simple reciprocating motion into a controlled force distribution pattern that reduces peak forces while maintaining compression effectiveness.
Solution Approach 2:
The linkage mechanism acts as an intermediary between the handle and the piston. The three rigid members with pivot connections serve as force-transmitting intermediaries that modify the force vector, distributing the applied force more evenly throughout the stroke rather than transmitting it directly, thereby reducing the peak force requirement at the piston.
2Productivity
If stroke volume is increased, then the volume of air pressurized per stroke increases, but the force required to achieve the same pressure increases
Solution Approach 1:
The dynamic linkage mechanism allows the pump to achieve larger stroke volumes by optimizing the mechanical advantage throughout the stroke. The changing configuration of the three rigid members maintains effective force transmission even at larger displacement volumes, decoupling the direct relationship between stroke volume and force requirement that exists in simple piston designs.
Solution Approach 2:
The patent changes the mechanical parameters of the force transmission system through the linkage mechanism. By altering the geometric relationships between the three rigid members during the stroke, the system achieves different mechanical advantage ratios at different positions, allowing large stroke volumes to be achieved without proportionally increasing the peak force required.
3Productivity
If dozens or hundreds of strokes are required to pressurize adequate volume of air, then the pump can be simple in design, but the time required to pressurize increases
Solution Approach 1:
The dynamic linkage mechanism enables more efficient pressurization by reducing the number of strokes needed. The optimized force distribution and mechanical advantage provided by the three rigid members allow each stroke to contribute more effectively to pressure buildup, reducing the total stroke count from dozens or hundreds to a manageable number of strokes.
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
This design reduces the force required to generate pressures up to 3000 psi to about 40 lbs, delivering over six times the volume per stroke compared to traditional pumps, with a more manageable and less fatiguing force profile for the user.
Implementation Method 1
The third member is arranged to transmit between the handle and the connected second ends of the first and second members a force resulting from a force applied to the handle
Data Source
AI summary
An air pump comprises a cylinder, a piston, a piston rod, three substantially rigid members, and a handle. The piston is reciprocably movable within the cylinder and is secured to the piston rod. The first member is pivotably connected at its first end to the cylinder. The second member is pivotably connected at its first end to the piston rod and at its second end to the second end of the first member. The third member is pivotably connected at its first end to the connected second ends of the first and second members. The handle is pivotably connected to the second end of the third member. The third member is arranged to transmit between the handle and the connected second ends of the first and second members a force resulting from a force applied to the handle.