Fluid Dispenser Skirt with Triangular Bosses for Reduced Unscrewing Torque
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Solution Overview
Problem
Existing fluid dispensers with deformable skirts struggle to be easily unscrewed and re-screwed due to the formation of deep, perpendicular impressions on the threaded neck, leading to difficulties in reattachment and seal maintenance.
Innovation Solution
A fluid dispenser design featuring a skirt with triangular bosses and asymmetrical inclined ramps, allowing for reduced unscrewing torque and improved screwing ease, along with a deformable annular plate for axial movement and force distribution, facilitating easy assembly and reassembly without the need for a hoop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the skirt includes tabs with elongated internal ribs that form deep impressions on the neck threads, then the attachment to the neck is perfectly secure, but it becomes difficult to screw the fastening component back onto the collar and it gets misaligned
Solution Approach 1:
The invention replaces the traditional flat vertical edge of the internal ribs with a curved apex that points radially inward. This curvature allows the rib to progressively engage with the neck threads during screwing, reducing misalignment and making re-screwing easier while maintaining secure attachment through the deformed impression on the threads
Solution Approach 2:
The invention changes the geometric parameters of the internal ribs by eliminating the flat vertical edge and creating an apex with two inclined ramps. This parameter change modifies the engagement characteristics with the neck threads, reducing the torque required for screwing and improving re-attachability while maintaining attachment security
2Reliability
If the rigid collar pushes the internal ribs against the threads of the neck to create a negative impression, then the attachment is secure, but the unscrewing torque becomes too high and reattachment is difficult
Solution Approach 1:
The curved apex of the internal ribs with two inclined ramps allows for a more gradual engagement with the neck threads. This reduces the peak force required for unscrewing while maintaining the secure attachment through the deformed impression, as the curvature distributes the engagement force more evenly during both screwing and unscrewing operations
3Reliability
If the flat vertical edge of the internal ribs extends perpendicularly to the force exerted by the neck thread, then deep and enveloping indentations are formed for secure attachment, but the contact area increases the unscrewing torque
Solution Approach 1:
The invention changes the geometric parameters of the internal ribs by replacing the flat vertical edge with an apex featuring two inclined ramps. This parameter change reduces the perpendicular contact area with the neck threads, thereby reducing the unscrewing torque while maintaining secure attachment through the deformed impression formed by the apex
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 design enables easy mounting, unscrewing, and re-screwing of the dispensing head with reduced torque requirements, ensuring a secure seal and improved stability, while the deformable plate enhances aesthetic appeal and force distribution.
Implementation Method 1
each boss comprises two substantially triangular lateral sides and two opposing inclined ramps which meet at an apex which points radially inwards... so as to deform against the thread
Data Source
Figure 1~2
Figure 3a~3d
Figure 4~5
AI summary
Dispenser comprising: - a reservoir provided with a neck forming at least one screw thread (T) and an upper edge, - a dispensing head comprising a dispensing member, a push-button and a fixing member engaging both with the threaded neck and with the dispensing member, the fixing member comprising a skirt forming several bosses (62), at least some of these bosses (62) coming into pressured contact with the screw thread (T) of the neck, characterized in that each boss (62) comprises two triangular lateral flanks and two inclined ramps (621, 622) which meet at an apex (623), which points radially inwards.