Band Clamp Locking Mechanism with Drive Rack and Pawl
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Solution Overview
Problem
Conventional band clamps for pressure vessels lack precise locking mechanisms, leading to potential separation due to improper tightening, which can result in either inadequate sealing or clamp failure under pressure.
Innovation Solution
A band clamp assembly featuring a drive rack and housing with a rotatable drive gear and locking pawl, providing discrete locking positions to securely fasten pressure vessel components, preventing separation by allowing precise adjustment and ensuring proper sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a threaded rod and nut combination is used to tighten the band clamp, then the clamp can be adjusted to various positions, but the user cannot precisely determine the proper tightening amount, leading to either insufficient sealing or clamp failure
Solution Approach 1:
The continuous adjustment range of the threaded rod is segmented into discrete locking positions using notches on the drive rack. These notches divide the infinite adjustment possibilities into specific, predetermined positions, allowing the locking pawl to engage at exact intervals and provide precise tightening control.
Solution Approach 2:
The locking pawl acts as an intermediary mechanism between the drive rack and the final clamping force. It mediates the adjustment process by engaging with notches to lock the drive rack at precise positions, translating continuous rotational input into discrete, controlled tightening steps.
2Reliability
If the band clamp is tightened too much, then stronger sealing is achieved, but portions of the band clamp may undergo additional stresses causing breakage or failure
Solution Approach 1:
The notches are pre-positioned on the drive rack at optimal tightening intervals determined during design. This preliminary action embeds the correct tightening force limits into the structure itself, preventing users from applying excessive force that could cause clamp failure while ensuring sufficient sealing at each notch position.
3Strength
If the band clamp is not tightened enough, then clamp stress is reduced, but the pressure vessel may not be properly sealed resulting in separation
Solution Approach 1:
The locking pawl engages with notches to mediate the tightening process, ensuring that the clamp reaches sufficient sealing force at each locked position. This intermediary mechanism prevents under-tightening by providing positive engagement at predetermined positions that guarantee adequate sealing pressure.
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 solution ensures secure fastening of pressure vessel components with distinct locking positions, preventing separation and reducing the risk of clamp failure, thus ensuring reliable operation under pressure.
Implementation Method 1
a locking pawl configured to engage the at least one locking notch to substantially prevent lateral movement of the drive rack in at least one direction
Implementation Method 2
a rotatable drive gear to engage the first side of the drive rack
Data Source
AI summary
Embodiments of the invention include a band clamp assembly. The band clamp assembly includes a drive rack and a housing including a receiving hole, a rotatable drive gear, and a locking pawl. The band clamp is movable to a locking position by advancing the drive rack through the receiving hole in the housing. A first side of the drive rack is designed to engage the rotatable drive gear and the locking pawl is designed to engage a second side of the drive rack.