Pipette Volume Offset Mechanism With Quickset Gear Adjustment
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Solution Overview
Problem
Existing volume-adjustable pipettes require significant time and effort for large volume changes, often featuring complex and inaccurate adjustment mechanisms, separate inputs for low and high speed adjustments, and are not compact enough for efficient use in pipetting operations.
Innovation Solution
A quickset mechanism with a planetary gearbox that provides three input modes: direct drive, speed multiplying, and lock, allowing for rapid and precise volume adjustments, combined with a calibration and volume offset mechanism for improved pipette functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a full rotation of the pipette volume adjusting device is used, then the volume changes by 5%-10% of the total volume, but this requires significant and time consuming effort for large volume changes
Solution Approach 1:
The patent implements a planetary gearbox mechanism that dynamically changes the transmission ratio based on the direction of rotation. When rotating in the first direction (coarse adjustment), the gearbox provides a higher transmission ratio for faster volume changes. When rotating in the second direction (fine adjustment), it provides a lower transmission ratio for precise control. This dynamic adaptation resolves the contradiction by allowing both rapid large-volume changes and precise fine-tuning without time loss.
Solution Approach 2:
The patent employs periodic action through bidirectional rotation capability, where the user can alternately rotate the volume adjusting device in first and second directions. The planetary gearbox is configured to respond differently to each direction, enabling the user to switch between coarse adjustment mode (for rapid volume changes) and fine adjustment mode (for precision). This periodic switching between adjustment modes eliminates the time loss associated with single-mode systems.
2Productivity
If separate volume adjustment inputs are provided for low speed and high speed adjustments, then volume adjustment speed is increased, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a single volume adjusting device that performs multiple functions through bidirectional rotation. The same input mechanism (plunger button or external actuator) can rotate the planetary gearbox in either direction, selecting between coarse and fine adjustment modes. This eliminates the need for separate adjustment inputs while maintaining high productivity, as one universal component replaces what would otherwise require multiple specialized components.
Solution Approach 2:
The patent merges the functions of low-speed and high-speed volume adjustment into a single integrated mechanism. The planetary gearbox combines both adjustment modes in one device, where the direction of rotation determines the transmission ratio. This merging reduces device complexity by consolidating what would be separate adjustment inputs into one unified control element, while still achieving high adjustment speeds through the appropriate mode selection.
3Measurement precision
If calibration is accomplished by disconnecting volume display from volume screw and moving bottom stop, then calibration accuracy is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent merges calibration and volume offset adjustments into a single integrated mechanism using the planetary gearbox. The same gearbox that provides bidirectional volume adjustment also enables calibration by allowing disconnection of the volume display from the volume screw while maintaining connection to the bottom stop. This merging reduces device complexity compared to having separate calibration and offset mechanisms, while achieving high calibration accuracy through the unified mechanical linkage.
Solution Approach 2:
The planetary gearbox serves multiple functions: it provides bidirectional volume adjustment, enables calibration by disconnecting the volume display, and allows volume offset adjustment by moving the bottom stop. This multi-functionality improves ease of operation by using a single mechanism for multiple tasks, while maintaining calibration accuracy through the precise mechanical connections established by the gearbox design.
4Ease of operation
If the pipette is made compact for efficient use, then ease of operation is improved, but space for complex adjustment mechanisms is reduced
Solution Approach 1:
The patent employs nesting by placing the planetary gearbox mechanism within the existing pipette structure. The gearbox components are arranged concentrically and nested within each other, with the sun gear, planet gears, and ring gear occupying minimal space. This nested arrangement allows the complex adjustment mechanism to fit within a compact pipette body, maintaining ease of operation while minimizing the space required for the mechanism.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by orienting the planetary gearbox components in different dimensions. The sun gear rotates on the central axis, planet gears rotate on radial axes, and the ring gear provides circumferential constraint. This dimensional arrangement packs the complex mechanism into a compact volume, allowing the pipette to remain small and easy to handle while accommodating the sophisticated adjustment mechanism.
Data Source
AI summary
A pipette calibration and volume offset mechanism. The calibration and volume offset mechanism is provided to facilitate user selectable calibration or volume offset operations of a pipette to which the calibration and volume offset mechanism is installed, through axial displacement of a threaded element that effectively moves the home position of the pipette. An offset counter of the calibration and volume offset mechanism is rotationally coupled to the threaded element during a volume offset operation to indicate offset magnitude, but decoupled from threaded element during a calibration or recalibration operation.