Overhead Patient Lift Sling Bar Load Cell Integration
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Solution Overview
Problem
Existing overhead patient lift systems with in-line scales face limitations such as reduced lift height due to scale length and potential measurement inaccuracies due to the lever arm effect caused by the distance between the load cell and the sling bar.
Innovation Solution
Integrating the load cell within the sling bar of the overhead patient lift system, allowing it to rotate while maintaining precise weight measurements, thus eliminating the need for external components and minimizing measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an in-line scale is installed between the sling bar and the lift strap, then weight measurement capability is achieved, but the available lift height is reduced by up to 8 inches
Solution Approach 1:
The patent merges the scale housing with the sling bar by providing a recess in the sling bar that receives the load cell, eliminating the need for a separate in-line scale component. This integration removes the additional length that would be required for a separate scale assembly, thereby restoring full lift height while maintaining weight measurement capability.
2Ease of manufacture
If the load cell is positioned far from the sling bar in an overhead patient lift system, then installation is simplified, but measurement accuracy is reduced due to the lever arm effect
Solution Approach 1:
The load cell is nested within a recess in the sling bar, positioning it as close as possible to the attachment point. This nesting approach minimizes the lever arm distance between the load cell and the sling bar connection point, thereby eliminating measurement errors while the recess design maintains ease of installation by providing a pre-formed mounting location.
3Length of moving object
If the load cell is integrated within the sling bar, then measurement accuracy is improved and lift height is maximized, but the device complexity increases
Solution Approach 1:
The sling bar is segmented to include a recess that houses the load cell, allowing the load cell to be installed as a separate component within the existing sling bar structure. This segmentation approach maintains relative simplicity by not requiring complete redesign of the sling bar while achieving integration benefits.
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
This solution enhances the accuracy and precision of patient weight measurements, improves safety by reducing the risk of load cell detachment, and simplifies setup and maintenance by integrating the load cell within the sling bar.
Implementation Method 1
load cells typically use strain gauge technology to measure the deformation caused by applied forces
Data Source
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AI summary
The present invention concerns an in-line lift system and method for a patient lift system with a scale. The system incorporates a load cell pivotally attached within a sling bar, allowing for precise weight measurement during patient transfers and allowing increased height to which the patient may be lifted. The load cell is integrated into a sling bar. The load cell may be attached to a cradle pivotally attached within a central portion of the sling bar. The attachment cup suspends the lift system and enables rotation. The lifting system further comprises a suspending assembly, a sling bar pivotally attached to the suspending assembly system about a vertical axis, a load cell pivotally attached in a central section of the sling bar and movement limiting assembly.