Cam Lock Safety Assembly for Partial Opening Under Pressure
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Solution Overview
Problem
Conventional cam lock fittings do not prevent inadvertent pressurized discharge of materials when opening, potentially causing injury or environmental damage due to unknown pressure status.
Innovation Solution
A safety lock assembly that allows the cam lock fitting to be partially opened, enabling the operator to determine if the contents are pressurized, and can be quickly reclosed if pressure is detected, featuring slidable bosses or an earless cam disk mechanism to prevent complete separation and reseal the fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cam lock fitting is opened directly without pressure assessment, then the operator can quickly access the contents, but pressurized materials may discharge accidentally causing injury or environmental damage
Solution Approach 1:
The safety lock assembly requires the operator to perform a preliminary action by moving the safety handle from the locked position to the intermediate position before fully opening the fitting. This preliminary step allows the sealing member to be partially retracted, enabling pressure assessment through observation or tactile feedback before complete opening, thus preventing accidental discharge of pressurized materials
2Reliability
If the safety lock assembly is designed with slidable bosses or earless cam disk mechanism, then the operator can assess pressure status before full opening, but the device complexity increases
Solution Approach 1:
The safety lock assembly integrates multiple functions into a single mechanism: the safety handle simultaneously controls the sealing member's retraction, enables intermediate positioning for pressure assessment, and prevents complete opening when pressurized. The cam lock fitting's existing cam levers and bosses are utilized to achieve the intermediate position mechanism, reducing the need for entirely separate components and minimizing overall device complexity while maintaining high reliability
3Ease of operation
If the cam lock fitting allows complete separation of male and female portions, then the operator can fully access the contents, but inadvertent discharge of pressurized materials cannot be prevented
Solution Approach 1:
The opening process is segmented into distinct stages: the first stage allows partial separation where the sealing member is retracted to an intermediate position enabling pressure assessment, and the second stage allows complete separation for full access. The safety lock assembly physically prevents progression to the second stage when pressure is detected in the first stage, thus segmenting the access process to prevent inadvertent discharge while maintaining full accessibility when safe
Data Source
AI summary
Method and apparatus for a safety lock assembly for a cam lock fitting mounted onto the outside of the cam lock fitting in close proximity to the cam levers to prevent complete separation of the male and the female portions of the fitting to prevent inadvertent pressurized discharge of dangerous materials. In one embodiment, this is accomplished by having slidable bosses upon which the cam levers are mounted which bosses are adapted to slide in response to movement of a safety handle so that the male and female portions of the cam lock fitting only slightly separate from each other allowing the operator to quickly reclose the cam lock fitting if the operator observes that the cam lock fitting still contains pressurized material. In a second embodiment, an earless cam disk moves on slotted, fixedly mounted bosses in response to movement of a safety handle similarly to the first embodiment.