Ratchet Clamp With Tamper-Evident Locking for Sterile Fittings
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Solution Overview
Problem
In the bio-technology, pharmaceutical, and food industries, there is a need for tamper-evident and secure fluid-tight connections between sanitary fittings that can maintain sterile conditions, as existing clamp technologies lack effective tamper-proof mechanisms and may not provide adequate tactile or audible feedback for optimal clamping force.
Innovation Solution
A tamper-evident clamp design featuring hingedly connected arcuate portions with a ratchet mechanism, including a linear rack and pawl system with asymmetrical teeth, and a tamper-evident cover that prevents external access to the actuator mechanism, providing secure locking and tactile/audible feedback for proper clamping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clamp uses a traditional wingnut and bolt mechanism for connection, then it allows easy operation and assembly, but it lacks tamper-evident features and may be subject to unauthorized opening
Solution Approach 1:
The actuator mechanism (pawl and rack) is nested within the clamp body structure, with the pawl housed in a cavity formed by the arcuate portions. This nesting conceals the actuator mechanism and prevents external access while maintaining the functional integrity of the ratchet locking system
Solution Approach 2:
The pawl is extracted as a separate, removable component from the clamp body, allowing it to be housed in a dedicated cavity. This separation enables the tamper-evident cover to effectively isolate the actuator mechanism while maintaining ease of assembly and disassembly through the release tab feature
2Measurement precision
If a clamp provides no tactile or audible feedback, then it simplifies the mechanism, but it does not provide adequate feedback for optimal clamping force
Solution Approach 1:
The ratchet mechanism incorporates asymmetric teeth on the rack that engage with the pawl to produce distinct tactile and audible feedback during engagement. This feedback mechanism allows the operator to sense when optimal clamping force is achieved without adding complex electronic or mechanical measurement systems
Solution Approach 2:
The rack features asymmetric teeth with different engagement characteristics on opposite sides, creating distinct tactile and audible signals when the pawl engages with each tooth. This asymmetry provides natural feedback about the clamping state without requiring additional components
3Strength
If a clamp uses a simple hinged connection without a ratchet mechanism, then it reduces device complexity, but it cannot maintain secure locking under pressure
Solution Approach 1:
The ratchet mechanism transforms the static hinged connection into a dynamic locking system where the pawl can engage with the rack teeth to prevent reverse motion. This dynamic feature maintains secure locking under pressure while allowing controlled opening through the release tab mechanism
Solution Approach 2:
The clamp is segmented into functional components: arcuate portions for clamping, a rack with asymmetric teeth for locking, and a removable pawl with release tab for actuation. This segmentation allows each component to be optimized for its specific function while working together to provide secure locking
4Object-affected harmful factors
If a clamp allows direct external access to the actuator mechanism, then it enables easy opening, but it prevents tamper-evident sealing and sterile condition maintenance
Solution Approach 1:
The actuator mechanism is nested within a cavity formed by the arcuate portions, with the pawl housed inside and the release tab extending through a controlled opening. This nesting protects the actuator mechanism from external contamination while maintaining controlled access for intentional opening
Solution Approach 2:
The release tab acts as an intermediary between the external environment and the internal actuator mechanism. It provides a controlled interface that allows intentional opening while preventing unauthorized access and maintaining the sterile barrier when the clamp is closed
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 ensures secure, fluid-tight connections while preventing unauthorized opening, maintaining sterile conditions and providing user feedback for optimal clamping force, suitable for repeated sterilization cycles and various industrial applications.
Implementation Method 1
a ratchet mechanism for locking the first and second arcuate portions in a closed position; wherein the ratchet mechanism comprises a linear rack provided with the second arcuate portion and a pawl provided with the first arcuate portion for receiving the linear rack; wherein the linear rack comprises one or more asymmetrical teeth; wherein the pawl comprises a plurality of fingers which are biased into engagement with the teeth of the linear rack
Implementation Method 2
providing user feedback for optimal clamping force
Implementation Method 3
providing user feedback for optimal clamping force
Implementation Method 4
a tamper-evident cover that prevents external access to the actuator mechanism
Data Source
AI summary
A clamp comprising: a first arcuate portion; a second arcuate portion hingedly connected to the first arcuate portion; and a ratchet mechanism for locking the first and second arcuate portions in a closed position; wherein the ratchet mechanism comprises a linear rack provided with the second arcuate portion and a pawl provided with the first arcuate portion for receiving the linear rack; wherein the linear rack comprises one or more asymmetrical teeth; wherein the pawl comprises a plurality of fingers which are biased into engagement with the teeth of the linear rack.