Nested Counting Wheels for Medicament Dispensers
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Solution Overview
Problem
Mechanical counting devices in medicament dispensers face challenges in providing an accurate and easily readable count, while being compact and cost-effective, due to issues with component complexity, size constraints, and vulnerability to impacts and vibrations.
Innovation Solution
A mechanical counting device with a direct communication mechanism between wheels, incorporating a rotational locking mechanism to prevent miscounting, and a design that allows for clear display of numbers using thin annular rings and overlapping wheels, reducing the number of components and improving accuracy and readability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical counting device is made robust to withstand impacts and vibrations, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a nested wheel structure where the first counting wheel is positioned within the second counting wheel, and both wheels share a common central axis. This nesting arrangement allows the counting mechanism to be compact while incorporating multiple counting functions (units and tens) without proportionally increasing the overall device footprint or component complexity.
Solution Approach 2:
The counting device is segmented into distinct functional components: a first counting wheel for units, a second counting wheel for tens, a ratchet mechanism for incremental advancement, and a locking mechanism for preventing backward movement. Each segment performs a specific function, allowing the system to achieve reliable counting through modular, independent components that can be manufactured and assembled separately.
2Ease of operation
If the counting device is made compact for portability, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
By nesting the first counting wheel within the second counting wheel rather than placing them side-by-side, the patent achieves a compact radial arrangement that fits within a smaller diameter. This nested configuration reduces the overall width of the device while maintaining the functional separation between units and tens wheels, thereby improving portability without requiring excessively tight manufacturing tolerances for lateral alignment.
Solution Approach 2:
The patent combines multiple functions into shared components: both counting wheels share a common central axis and housing, the ratchet mechanism serves both wheels through a unified engagement system, and the locking mechanism provides centralized protection for the entire counting assembly. This merging reduces the number of separate mounting features required, thereby reducing cumulative manufacturing precision requirements.
3Device complexity
If a single wheel is used for counting, then device complexity is reduced, but measurement precision decreases
Solution Approach 1:
The patent uses a nested arrangement of two counting wheels (first wheel for units, second wheel for tens) where the inner wheel's rotation is mechanically coupled to the outer wheel through a ratchet mechanism. This nested dual-wheel configuration enables accurate counting of larger numbers (up to at least 99) by combining the digits from both wheels, achieving measurement precision that would be impossible with a single wheel of the same size constraints.
Solution Approach 2:
Instead of using a single wheel with many discrete positions, the patent transitions to a two-dimensional counting system using two wheels with fewer positions each (0-9 on the units wheel, 0-9 on the tens wheel). This dimensional change from a single-circle to a multi-circle system allows for more precise measurement of larger quantities while keeping each individual wheel simple and manageable in complexity.
4Ease of operation
If larger wheels are used for better readability, then ease of operation is improved, but volume of the device increases
Solution Approach 1:
The nested wheel arrangement allows both the first counting wheel and second counting wheel to be positioned within a compact radial space, with the inner wheel contained within the outer wheel's diameter. This nesting enables adequate numbering size for readability on both wheels without proportionally increasing the overall device volume, as the wheels share the same radial envelope rather than requiring additional lateral space.
Solution Approach 2:
The patent transitions from a single large wheel to two smaller nested wheels, effectively distributing the counting information across two dimensions (radial layers) rather than requiring one large two-dimensional display surface. This allows each wheel to have sufficiently large digits for readability while the nested arrangement keeps the overall device footprint compact.
Data Source
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AI summary
A counting device for counting mechanical inputs is disclosed. The counting device (100,200) comprises a rotatably mounted first counting wheel (120,220) arranged to rotate by a predetermined amount for every input that is to be counted and a second counting wheel (130,230) in mechanical communication with the first counting wheel (120,220), and at least in part overlapping the first counting wheel (120,220). At least one of the counting wheels (120,220) comprises a circumferential lip (129,229) which supports an indicia ring (124,224) of said counting wheel (120,220), the indicia ring (124,224) comprising a circumferential array of counting indicia on an annular surface, and the circumferential lip (129,229) having a height sufficient for a counting wheel volume to be formed that receives the other counting wheel (130,230).