Cartridge Dispenser Toggle Lever for Constant Flow Rate
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Solution Overview
Problem
Dispensers with toggle levers experience non-constant power gear ratio and medium flow rate due to changing pressure during actuation, leading to inconsistent volume dispensing.
Innovation Solution
A dispenser design featuring a toggle lever with an undulating transfer surface and prominent catches that maintains a constant power gear ratio by repeatedly moving the hinge section perpendicular to the longitudinal direction, ensuring a consistent flow rate through the use of a transfer mechanism that applies driving force parallel to the longitudinal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a toggle lever is used in the driving mechanism to exert pressure on the medium, then high pressure can be achieved during actuation, but the power gear ratio changes during movement resulting in non-constant volume dispensed over time
Solution Approach 1:
The patent applies dynamics by making the transfer surface undulating rather than flat, causing the transfer point to move vertically during actuation. This dynamic movement compensates for the changing geometry of the toggle lever, maintaining a constant power gear ratio throughout the actuation stroke. The vertical displacement of the transfer point dynamically adjusts the mechanical advantage to offset the toggle lever's natural variation in gear ratio.
Solution Approach 2:
The patent changes the geometric parameters of the transfer mechanism by using an undulating transfer surface with varying height. This parameter change allows the transfer point's vertical position to vary during actuation, thereby maintaining a constant power gear ratio. The specific height profile of the undulating surface is designed to compensate for the toggle lever's changing mechanical advantage, ensuring uniform medium dispensing.
2Device complexity
If the hinge section moves in a straight line parallel to the longitudinal direction, then the transfer mechanism is simple, but the power gear ratio is not constant and flow rate varies
Solution Approach 1:
The patent transforms the simple linear movement of the hinge section into a dynamic vertical movement by incorporating an undulating transfer surface. This dynamic movement path, while adding some complexity to the transfer mechanism, ensures that the power gear ratio remains constant throughout actuation, thereby achieving uniform flow rate and resolving the productivity issue.
Solution Approach 2:
The patent introduces a vertical dimension to the hinge section's movement by using an undulating transfer surface. Instead of moving only in the longitudinal direction (one dimension), the transfer point now moves in two dimensions: longitudinally with the actuation force and vertically due to the undulating surface profile. This dimensional change enables constant power gear ratio maintenance.
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 solution provides an approximately constant power gear ratio and flow rate of the medium dispensed, improving the uniformity of the medium application over time by effectively utilizing the amplification effect of the toggle lever.
Implementation Method 1
a toggle lever with a first lever part, a hinge section and a second lever part, the first lever part pivotably mounted in the housing, the second lever part in operative connection with the driving rod to move the driving rod
Implementation Method 2
the transfer mechanism comprises an undulating transfer surface with several prominent catches for contacting the hinge section of the toggle lever to provide an operative connection to the toggle lever, whereby an application of the driving force by the trigger mechanism moves the transfer surface in a driving direction at least partly essentially parallel to the longitudinal direction and the prominent catches of the undulating transfer surface repeatedly move the hinge section perpendicular to the longitudinal direction
Data Source
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AI summary
The present invention relates to a dispenser (1) for cartridges, comprising a cartridge section (10) for arranging the cartridge, and a handle section (20), whereby the handle section (20) comprises a housing (22) and a driving mechanism (30) arranged in the housing (22) to drive a driving rod (14) in a longitudinal direction (110) into a cartridge arranged in the cartridge section (10) to exert pressure on a medium stored in the cartridge. Further, the present invention relates to a method of operating a dispenser (1) for cartridges, in particular a dispenser (1) in accordance with one of the preceding claims, the dispenser (1) comprising a cartridge section (10) for arranging the cartridge and a driving mechanism (30) to drive a driving rod (14) of the dispenser (1) in a longitudinal direction (110) into a cartridge arranged in the cartridge section (10) to exert pressure on a medium stored in the cartridge.