Rotating Closure Piston for Cartridge Air Venting
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Solution Overview
Problem
Existing piston designs for cartridges fail to efficiently vent residual air while ensuring secure closure, often leading to inaccurate dispensing due to air pockets and complex handling processes.
Innovation Solution
A piston with a base body featuring a ventilation opening throughout, equipped with a rotatable closure element that can open or close the ventilation channel by relative rotation, allowing air to escape during insertion and securely sealing the cartridge without requiring additional components or complex axial movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a central ventilation opening with a stopper is used to allow residual air to escape, then air venting is improved, but the device complexity increases due to the separate stopper component that must be inserted into the piston
Solution Approach 1:
The closure element is integrated directly into the piston body, forming a single-piece construction. The piston base body includes both the ventilation opening and the closure element as unified components, eliminating the need for separate stopper insertion and reducing assembly complexity while maintaining air venting functionality
2Object-affected harmful factors
If a stopper is used to close the ventilation opening after air escape, then air venting is improved, but reliability deteriorates because the stopper can be pressed out by high internal pressure
Solution Approach 1:
The closure element is designed to rotate relative to the piston base body, transitioning from an open position (allowing air escape) to a closed position (sealing the ventilation opening). This rotational movement enables dynamic control of the ventilation opening without requiring axial insertion or extraction of separate components, ensuring reliable closure under pressure
3Object-affected harmful factors
If a tapered bottom surface with a vent opening is used, then air venting is improved, but manufacturing precision deteriorates because material accumulates in the middle during filling, clogging the ventilation channel
Solution Approach 1:
Instead of relying on axial flow through a tapered opening, the invention uses rotational movement of the closure element to control ventilation. The closure element rotates within a cylindrical ventilation opening, using angular positioning rather than axial geometry to control air escape, thereby avoiding material accumulation and clogging issues
Data Source
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AI summary
The invention relates to a piston, in particular for use as a discharge and/or closing piston of a cartridge, comprising a main body (25), which has a lateral wall having sealing means (14, 17) and an end-face wall, which has a venting opening (21). A closing element (18) is rotatably mounted in the venting opening (21), wherein a venting channel (23, 24) can be opened and closed by the relative rotation of the closing element (18) in the venting opening (21). The invention further relates to a cartridge arrangement having such a piston.