Filtration Clamp Cam Lock for One-Handed Membrane Sealing
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Solution Overview
Problem
Conventional vacuum filtration clamps require high operational force, leading to cumbersome designs with multiple pinch points, instability, and difficulty in single-handed operation, which can result in sample loss and breakage due to the need for large handles and excessive clamping force.
Innovation Solution
A bimodal clamp design utilizing a torsion spring for initial membrane seal and a secondary locking mechanism with a rotating cam mechanism to provide additional clamping force, allowing for reduced handle size, improved stability, and single-hand operation, while minimizing hazardous pinch points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a single high-force torsion spring is used to provide sufficient clamping force for both membrane sealing and secure connection, then the clamping force requirement is met, but the handle size becomes large and cumbersome, creating multiple pinch points and affecting stability
Solution Approach 1:
The clamping function is segmented into two distinct mechanisms: a low-force torsion spring for membrane sealing and a high-force cam mechanism for secure connection. This segmentation allows each mechanism to be optimized for its specific force requirement, enabling small handles that are easy to control while still achieving the necessary total clamping force.
Solution Approach 2:
The cam mechanism provides dynamic force multiplication during the clamping action. As the cam rotates, it progressively increases the clamping force on the membrane, allowing the handle to remain small while delivering high peak forces when needed, rather than requiring constant high force throughout the operation.
2Force
If large handles are used to actuate a high-force torsion spring, then sufficient clamping force is achieved, but the clamp becomes cumbersome and unstable, potentially causing the apparatus to fall over
Solution Approach 1:
By separating the clamping function into two mechanisms, the handle size is dramatically reduced. The small handles of the cam mechanism do not upset the balance of the filtration apparatus, maintaining stability while still achieving sufficient clamping force through the cam's mechanical advantage.
3Force
If a single high-force torsion spring is used, then both membrane sealing and secure connection are achieved, but multiple pinch points are created posing safety hazards
Solution Approach 1:
The segmentation of clamping functions allows the cam mechanism to replace the need for large handles, thereby eliminating multiple pinch points. The cam's rotating action provides the necessary force without requiring the user to compress large handle structures, reducing safety hazards.
4Force
If conventional clamps with large handles are used, then sufficient clamping force is provided, but single-handed operation becomes difficult
Solution Approach 1:
The cam mechanism is designed with small handles that can be easily manipulated by one hand. The rotational motion of the cam provides mechanical advantage, allowing a single hand to generate the necessary clamping force without requiring the large handles typical of conventional clamps.
Solution Approach 2:
The cam's curved surface provides mechanical advantage during rotation, allowing the user to apply force over a longer arc rather than requiring high force over a short distance. This curved mechanism enables easy single-handed operation while still achieving high clamping forces.
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 clamp design reduces operational force requirements, enhances stability, and facilitates single-hand operation, eliminating hazardous pinch points and improving the overall usability and safety of the filtration process.
Implementation Method 1
a biasing member, such as a torsion spring, with a force high enough to achieve an initial membrane seal
Implementation Method 2
a rotating locking tab which employs a 'cam' mechanism mounted inside a jaw member of the clamp. The cam, when actuated such as by rotating the locking tab, interacts with a corresponding 'ramp' located on the underside of the other jaw member resulting in an interference fit which produces additional force on that jaw
Implementation Method 3
A vacuum source may be placed in communication with the apparatus and allows a vacuum to be drawn within the filtrate bottle or flask, thereby driving filtration by drawing the sample solution through the membrane filter
Data Source
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AI summary
A clamp including a first jaw member having a camming surface, a second jaw member pivotable with respect to the first jaw member, a first biasing member biasing the first and second jaw members to a first position; and a locking mechanism that includes a cam or roller for cooperating with the camming surface of the jaw member, and a second biasing member biasing the cam or roller against the camming surface to lock the first and second jaw members in a second position. An optional alignment collar can be used to align components of the filtration apparatus prior to clamping. Filtration apparatus including the clamp, and also optionally including the alignment collar, is also disclosed.