Adjustable Bed Lift Mechanism for Low-Profile High-Capacity Raising
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Solution Overview
Problem
Existing low-profile adjustable beds face limitations in achieving a high lift capacity while maintaining a low-profile elevation when fully collapsed, often requiring compromise between minimum height and maximum lift capacity, leading to unsuitability for obese patients and undesirable lateral displacement during height adjustment.
Innovation Solution
An adjustable bed design featuring a main frame with a fixed base and a lift mechanism that includes leg members with pivotally connected stabilizer links and a force multiplying actuating linkage, allowing the bed to be raised without longitudinal displacement, achieving a minimum vertical height of less than 9 inches while supporting loads over 1000 lbs and providing a large vertical height adjustment range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bed is designed to achieve a low-profile position (minimum vertical height of 8-9 inches), then the ease of operation for users with limited mobility is improved, but the lift capacity is reduced to 500 lbs maximum
Solution Approach 1:
The patent employs a dynamic actuating linkage system that changes its mechanical advantage ratio throughout the range of motion. When the bed is in the lowered position, the linkage geometry provides high mechanical advantage for lifting heavy loads. As the bed rises, the mechanical advantage decreases but the actuator travels a longer distance, maintaining effectiveness across the full range of motion. This dynamic adaptation allows the system to achieve both low-profile capability and high lift capacity.
Solution Approach 2:
The invention changes the geometric parameters of the actuating linkage as the bed moves between positions. The linkage is designed with specific pivot point locations and link lengths that create optimal mechanical advantage at each stage of motion. By carefully selecting these geometric parameters, the system maximizes lifting force when the bed is lowered while still achieving the desired low minimum height.
2Force
If larger actuators and mechanism components are used to increase lift capacity to 1000 lbs, then the maximum lift capacity is improved, but the minimum fully-lowered height increases to 9.5 inches or more
Solution Approach 1:
The patent designs the lift mechanism components to nest within each other when the bed is in the lowered position. The actuating linkage folds compactly, and the stabilizer links are positioned to minimize the overall height envelope. This nesting arrangement allows larger-stroke actuators and higher-capacity mechanisms to be accommodated within a compact space, achieving 1000 lbs lift capacity while maintaining a minimum height of only 8-9 inches.
Solution Approach 2:
The invention resolves the space conflict by utilizing the longitudinal dimension of the bed frame. Instead of requiring vertical space for the actuating mechanism, the linkage is arranged to extend primarily in the longitudinal direction, with the actuator mounted along the length of the bed. This dimensional reorganization allows high-capacity actuators to be integrated without increasing the minimum height of the lowered bed.
3Device complexity
If the actuator is positioned at a shallow angle beneath the bed in a low-profile configuration, then the device complexity is reduced, but the vertical force component is significantly limited
Solution Approach 1:
The patent introduces a stabilizer link as an intermediary component between the actuator and the bed frame. This stabilizer link transforms the shallow-angle actuator force into a more effective vertical lifting force. The stabilizer link is pivotally connected to both the actuator and the bed frame, creating a four-bar linkage that mechanically converts the actuator's horizontal or shallow-angle motion into vertical bed elevation, thereby amplifying the vertical force component without requiring the actuator itself to be positioned at a steep angle.
4Stability of the object's composition
If the bed uses a fixed base design to prevent lateral displacement during height adjustment, then the stability is improved, but the device complexity increases compared to pivotally supported designs
Solution Approach 1:
The patent combines the functions of lateral stabilization and vertical lifting into a single integrated mechanism. The stabilizer links that provide lateral stability are the same components that transmit the lifting force from the actuator to the bed frame. By merging these functions, the system achieves the stability of a fixed-base design without requiring separate stabilization mechanisms, thereby avoiding excessive complexity while maintaining prevention of lateral displacement during height adjustment.
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 design enables a high lift capacity of over 1000 lbs with a minimum vertical height of 8-9 inches, preventing lateral displacement during height adjustment and allowing for accurate weight measurement, thus addressing the limitations of existing low-profile beds.
Implementation Method 1
an actuating assembly including at least one actuator for each said leg member and a force multiplying actuating linkage interconnecting the actuator and the stabilizer link
Implementation Method 2
two or more leg members each having a first end pivotally connected with the fixed base at a fixed lower pivot and a second end pivotally connected with the main frame
Data Source
AI summary
An adjustable bed includes a main frame which supports a mattress platform, a fixed frame base having wheels mounted thereto for displacement thereof on a floor surface, and a lift mechanism interconnecting the main frame and the fixed frame base. The lift mechanism supports the main frame and is actuated to displace and position the main frame between a fully collapsed position and a fully elevated position relative to the fixed frame base without any longitudinal displacement of the bed. The main frame, the fixed base and the lift mechanism collapse into a low profile bed configuration in the fully collapsed position, such that the mattress platform is located at a minimum vertical height of at most 9 inches above the floor surface.