Double-Cam Lock Fitting for Safe Pressure Release Check
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Solution Overview
Problem
Conventional cam lock fittings lack a safety mechanism to prevent accidental release of pressurized contents, which can lead to injury or environmental damage when opening the fitting, as operators cannot determine if the contents are still under pressure.
Innovation Solution
A cam lock fitting with cooperating double cam levers, featuring a larger outer cam lobe and a fork-shaped smaller inner cam lobe, allowing partial opening and visual inspection for pressurized material, and an automatic lever latching mechanism to prevent inadvertent opening, enabling safe reclosure if pressure is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional cam lock fittings are opened without pressure detection, then quick operation is achieved, but accidental discharge of pressurized contents occurs causing injury or environmental damage
Solution Approach 1:
The patent applies preliminary action by requiring operators to perform a partial opening motion first to detect pressure before complete opening. The cam lever mechanism allows intermediate positioning where the cam lobe is partially disengaged from the groove, enabling pressure detection without full release. This preliminary detection step prevents accidental discharge while maintaining quick operation capability.
Solution Approach 2:
The patent introduces an intermediary state in the cam lever operation - a partial opening position between closed and fully open. This intermediary position allows the operator to detect pressure through visual or tactile cues before committing to full opening. The cam mechanism naturally provides this intermediate state through its geometric design, where the cam lobe can be partially withdrawn from the groove without complete disengagement.
2Reliability
If double cam levers are used for locking, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges two cam lever mechanisms into a single integrated assembly where both cam levers share common mounting features and operate in coordination. The female coupling incorporates both cam levers on opposite sides, and the male coupling provides a single groove that receives both cam lobes. This merging approach achieves enhanced reliability through dual locking while minimizing complexity by using unified structural elements rather than separate mechanisms.
Solution Approach 2:
The patent employs asymmetry in the cam lever design where one cam lever is positioned on each side of the female coupling, but they both engage a single groove in the male coupling. The cam lobes have asymmetric geometry relative to their respective lever arms, allowing them to engage the same groove at different angular positions. This asymmetric arrangement provides redundant locking reliability while maintaining relatively simple mechanism design.
3Reliability
If partial opening capability is added for pressure detection, then safety is improved, but ease of operation deteriorates due to additional steps
Solution Approach 1:
The patent applies dynamics by making the cam lever operation flexible rather than binary (fully closed or fully open). The cam mechanism allows smooth transition through intermediate positions where the cam lobe is partially disengaged from the groove. This dynamic capability enables operators to pause at any point during opening to detect pressure, without requiring discrete steps or additional controls. The operation remains simple because it follows the natural continuous motion of the cam lever.
Solution Approach 2:
The patent implements self-service by designing the cam mechanism to naturally indicate pressure status during the opening process. As the cam lever is pulled back, the partial disengagement of the cam lobe from the groove automatically creates a visible or tactile indication of pressure presence. The mechanism itself provides the detection function without requiring separate sensors or indicators, maintaining operational simplicity while enhancing safety.
Data Source
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AI summary
A method and apparatus for an improved safety cam lock fitting (54) having cooperating double cam levers (48, 50) having outer (62) and inner (64) portions so that when the outer cam levers (62) are opened and the inner cam levers (64) remain closed, the male (58) and female (56) conduits of the cam lock fitting (54) only slightly separate from each other allowing the operator to quickly reclose the cam lock fitting (54) if the operator observes that the cam lock fitting (54) still contains pressurized material. This is accomplished by providing a larger cam lobe (68) on the outer cam lever (62) and a smaller cam lobe (72) on a fork shaped inner cam lever (64) so that when the smaller cam lobe (72) is in a closed position and protrudes into a peripheral groove (86) on the male portion (58), the male (58) and female (56) conduits have a small space (106) therein between. An automatic lever latching mechanism (113) prevents the cam levers (62, 64) from being inadvertently opened.