Closure Device with Opposing Threads for Tilting Prevention
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Solution Overview
Problem
Existing closure devices for containers are complex to produce and prone to malfunction due to the need for axially movable, rotationally rigid mandrels, which can tilt and impede proper functioning.
Innovation Solution
A closure device design featuring a second partial thread on the inner housing side, allowing the mandrel to be fixed and eliminating the need for a movable opening element, with threads of opposite directions between components to simplify production and prevent tilting, enabling efficient medium discharge without changing the direction of rotational movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mandrel is made axially movable and rotationally rigid to move toward the membrane during unscrewing, then the membrane can be pierced to discharge the medium, but the device complexity increases and the mandrel may tilt causing malfunction
Solution Approach 1:
Instead of making the mandrel movable to achieve membrane piercing, the patent inverts the approach by making the mandrel fixed and non-rotatable. The membrane is made movable through the left-hand thread mechanism, which causes the membrane to move toward the fixed mandrel during unscrewing, thereby achieving piercing without requiring a complex movable mandrel structure.
Solution Approach 2:
The patent separates the functions of the mandrel and the membrane. The mandrel is designed as a fixed, non-rotatable component with a discharge channel, while the membrane is designed as a movable closing element that responds to the unscrewing motion. This segmentation allows the membrane to perform the piercing action while the mandrel remains stable and simple.
2Ease of operation
If a left-hand thread is arranged between the cover element and the mandrel to move the mandrel toward the membrane during unscreving, then the medium can be discharged, but the production complexity increases
Solution Approach 1:
The patent applies the inversion principle by reversing which component moves. Instead of moving the mandrel toward the membrane, the membrane is made to move toward the fixed mandrel through the left-hand thread mechanism between the cover element and the inner housing. This simplifies manufacturing by eliminating the need for a movable, rotationally rigid mandrel while maintaining the discharge function.
3Productivity
If the mandrel is made movable to pierce the membrane during unscrewing, then the discharge function is achieved, but the mandrel may tilt and impede proper functioning
Solution Approach 1:
The patent resolves this contradiction by inverting the movement mechanism. The mandrel is made fixed and non-rotatable, eliminating the risk of tilting. The membrane is made movable through the left-hand thread, which causes it to move toward the fixed mandrel during unscrewing. This ensures reliable operation while maintaining efficient medium discharge through the discharge channel.
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 simplifies production, prevents tilting, and allows for complete medium discharge during unscrewing, minimizing dripping and maintaining the usual counterclockwise unscrewing process.
Implementation Method 1
the cover element and the inner housing are connected to one another via a form-fit corresponding second thread... a left-hand thread arranged between the cover element and the mandrel causes the mandrel to move in the direction of the membrane at the same time
Data Source
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AI summary
A closure device (1) for a container (2) with a container opening (3) comprises a cover element (4) for closing the container opening (3), an internal housing (5), and a chamber (6) arranged on the cover element (4). The chamber is arranged at least partially in the internal housing (5) which has a first screw thread (10) corresponding in an interlocking way to a screw thread (10) of the container (2). The cover element (4) and the internal housing (5) have corresponding second screw threads (11), along which the cover element (4) can be moved relative to the internal housing (5) from a closed position into a discharge position, in which a medium stored in a chamber (6) in the container (2) can exit. The first and second screw threads (10/11) are designed to work in opposite directions, by which means the chamber (6) is moved further into the internal housing (5) during a movement into the discharge position.