Dual Caster Control Linkage for Patient Bed Maneuvering
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Solution Overview
Problem
Existing patient support apparatuses in healthcare facilities face challenges with complex and costly central control mechanisms for casters, requiring manual selection between mechanical and electrical control modes, which can lead to increased weight, production costs, and safety risks due to the need for external power sources and constant manual checks.
Innovation Solution
A dual control mechanism for casters using a servomotor that allows simultaneous mechanical and electrical operation without the need for manual selection or indication of control mode, integrating a servomotor with a cogwheel and pinion to control all casters in parallel, and utilizing position sensors for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a central control mechanism with separate mechanical and electrical systems is used to control casters, then the bed can be controlled from any side, but the weight and production costs increase
Solution Approach 1:
The patent combines mechanical and electrical control systems into a single integrated central control mechanism. The control unit integrates both mechanical linkages and electrical components (servomotor, position sensors) into one unified system that controls all casters, eliminating the need for separate independent control systems and reducing overall weight.
Solution Approach 2:
The central control mechanism is designed to perform multiple functions: it can control casters mechanically from any side of the bed, and also control the fifth caster electrically. The control unit serves as a universal control system that handles both mechanical and electrical operations through a single integrated architecture.
2Ease of operation
If a fifth caster with electromotor is added to the bed, then easier handling is achieved, but the control system complexity increases
Solution Approach 1:
The control system for the fifth caster is merged with the central control mechanism. The control unit integrates the electrical control of the fifth caster with the mechanical control of the four main casters, creating a unified control architecture that reduces overall system complexity despite adding functionality.
Solution Approach 2:
Position sensors are integrated into the central control mechanism to provide feedback on the position of casters. This feedback system allows the control unit to automatically adjust and coordinate the movement of all casters, including the fifth caster, reducing the complexity of manual coordination.
3Reliability
If indication mechanisms are added to show caster positions, then safety is improved, but the device complexity and cost increase
Solution Approach 1:
The central control mechanism serves as a universal control system that not only controls caster movement but also provides indication of caster positions. The control unit integrates both control and indication functions, eliminating the need for separate indication mechanisms and reducing overall complexity.
Solution Approach 2:
Position sensors integrated into the central control mechanism provide real-time feedback on caster positions. This feedback is used by the control unit to automatically indicate the status of casters, improving safety without requiring separate indication systems.
4Measurement precision
If separate brake mechanisms are used for each caster, then precise control is achieved, but the ease of operation decreases
Solution Approach 1:
The patent merges four separate brake mechanisms into a single central control mechanism. The control unit integrates the braking functions of all four casters into one unified system, allowing precise control of each caster while enabling operation from a single location, thus improving ease of operation.
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
Enables safe, efficient, and cost-effective control of casters with reduced complexity, allowing caregivers to focus on patient care without manual mode checks, while maintaining mechanical and electrical control capabilities.
Implementation Method 1
controlling of such casters dually, using servomotor
Implementation Method 2
utilizing position sensors for precise positioning
Data Source
AI summary
A patient support apparatus having a central dual control system of casters with an actuating pedal. Two opposite casters are connected by a control shaft with hexagonal cross section. Both control shafts are mutually coupled via a connecting member to a linkage rod. A servomotor with a rack is coupled to the linkage rod. The servomotor is configured to change a position of the rack of the servomotor and thus change a position of the central dual control system of casters upon manual change of position of the actuating pedal and/or upon electrical activation of the servomotor to change a position of the actuating pedal to another position of the central dual control system of casters.