Discharge Device with Intermediate Piece for Back Suction
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Solution Overview
Problem
Existing discharge devices for cosmetic media struggle to adapt to individual user needs and prevent product drying and blockage at the outlet, as they lack flexibility in metering strokes and back suction mechanisms.
Innovation Solution
A discharge device with two pump systems and a common actuating handle that allows for different metering strokes through varying free travels, coupled with a relative movement mechanism that minimizes the volume at the outlet opening, using a combination of rigid and reversibly deformable intermediate pieces and force elements to achieve precise control and back suction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the actuating handle is directly coupled to the piston without free travel, then the metering stroke is precisely controlled, but the product dries and blocks the outlet opening
Solution Approach 1:
The patent introduces a dynamic free travel mechanism between the actuating handle and piston, allowing the coupling distance to vary. During the discharge phase, the handle moves a full stroke; during the return phase, an additional back suction travel is created. This dynamic adjustment enables precise metering control while preventing product drying through the back suction effect.
Solution Approach 2:
The patent employs an intermediate piece (coupling element) between the actuating handle and piston that provides the free travel capability. This intermediary component allows relative movement between the handle and piston, enabling the back suction effect during handle reset while maintaining precise metering control during the discharge stroke.
2Object-generated harmful factors
If the actuating handle has free travel relative to the piston, then back suction effect is achieved, but the metering stroke control is reduced
Solution Approach 1:
The coupling mechanism is designed to be rigid during the discharge stroke (when handle moves from start to end position) providing precise metering control, and allows relative movement during the return stroke (when handle resets) to create back suction. This dynamic rigidity/flexibility switching resolves the contradiction between precise control and back suction effect.
Solution Approach 2:
The patent implements periodic alternating actions: during the forward stroke, the handle and piston move together for precise metering; during the return stroke, the handle resets with free travel to create back suction. This periodic switching between coupled and uncoupled states achieves both precise metering control and effective back suction.
3Device complexity
If two pump systems use a common actuating handle with equal metering strokes, then the handle design is simplified, but individualized dispensing of different media is not possible
Solution Approach 1:
The patent applies different free travel characteristics to different pump systems coupled to the same actuating handle. While the handle itself remains simple and unified, each pump system has locally differentiated coupling characteristics (different free travel distances), enabling individualized dispensing control without complicating the overall handle design.
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
Enables individualized dispensing of cosmetic products by varying metering strokes and prevents product drying and blockage through effective back suction, enhancing user experience and product handling quality.
Implementation Method 1
When the actuating handle is reset in its starting position, by means of said relative movement an additional back suction effect can be achieved by means of which a volume of the remaining medium in the region of an outlet opening is minimized.
Data Source
AI summary
A discharge device having an actuating handle, a first pump system for conveying a first medium and a second pump system for conveying a second medium. The actuating handle can be moved between an initial position and an end position. The first pump system includes a first pump chamber and a first piston arranged in a displaceable manner in the first pump chamber. The second pump system includes a second pump chamber and a second piston arranged in a displaceable manner in the second pump chamber. The first piston and the second piston can be displaced via the actuating handle in the direction of actuation, and the actuating handle and the first piston are coupled to each other such that the actuating handle and the first piston can be displaced relative to each other in a direction of actuation via a free travel.