Elastic Damper for Bed Load Detector Stability
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Solution Overview
Problem
Existing load detection systems for medical beds face precision issues due to the bed sometimes transitioning into a three-point supported state, leading to errors in load detection and biological state monitoring.
Innovation Solution
Incorporating a damper member with elasticity beneath the load detectors to prevent the bed from entering a three-point supported state, ensuring stable contact with the installation surface and maintaining a four-point support configuration, thereby enhancing precision in load detection and biological state monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bed is supported by four load detectors, then the load detection system can monitor the subject's biological state, but the bed may transition into a three-point supported state causing detection errors
Solution Approach 1:
A damper member is introduced as an intermediary element between the load detector base and the installation surface. This damper member prevents direct contact and rigid connection, allowing the system to maintain four-point support stability while isolating vibrations and preventing the bed from transitioning to a three-point supported state, thereby resolving the contradiction between measurement precision and support reliability
Solution Approach 2:
The damper member changes the mechanical parameter of the support interface from rigid to compliant. By introducing elasticity and damping characteristics, the system can accommodate minor position variations and maintain stable four-point contact, preventing the bed from shifting into a three-point supported state and ensuring consistent load detection precision
2Stability of the object's composition
If the bed transitions into a three-point supported state, then the bed achieves maximum stability as a rigid body, but random errors occur in the load detection values
Solution Approach 1:
The damper member provides preliminary anti-action by preventing the bed from transitioning into the three-point supported state in the first place. By maintaining compliant contact at all four support points, the system avoids the instability and detection errors associated with three-point support, while still achieving rigid body stability through controlled four-point contact
3Device complexity
If the load detector base contacts the installation surface directly, then the structure is simple, but floor vibrations affect the detection precision
Solution Approach 1:
The damper member serves as a vibration-isolating intermediary between the load detector base and the installation surface. This simple addition blocks the transmission of floor vibrations to the detection system while maintaining structural simplicity, thereby improving measurement precision without significantly increasing device complexity
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 effectively restrains the bed from entering a three-point supported state, allowing for more precise detection of the subject's load and biological state, while also reducing the influence of floor vibrations on the detection system.
Implementation Method 1
a damper member which is provided below the base and which is a sheet having elasticity
Implementation Method 2
the damper member is provided to prevent a contact between the base and an installation surface on which the load detector is installed
Data Source
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AI summary
A load detector to be used in a biological state monitoring system (1000), the biological state monitoring system being configured to determine a biological state of a subject based on an output of four load detectors (100a, 100b, 100c, 100d) provided with respect to a bed (BD) so as to detect a load of the subject on the bed via four points of the bed, includes: a base (11, 12); a load cell (21, 22) supported on the base in a cantilever manner to have a free end; a placement part (3) which is attached to the load cell on a side of the free end of the load cell and onto which the bed is to be placed; and a dumper member which is provided below the base and which has elasticity. The dumper member is provided to prevent a contact between the base and an installation surface on which the load detector is installed, in a state that the bed is placed on the placement part.