Adjustable Bed Foundation Cross-Member Mounting to Reduce Deflection
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Solution Overview
Problem
Conventional adjustable bed foundations experience deflection and damage due to the weight of the mattress and users, and generate noise when articulating, primarily because the articulating metal frames are directly attached to the side rails and secured with vertical screws that loosen over time, allowing the frame to move relative to the foundation.
Innovation Solution
An adjustable bed foundation design featuring an articulating frame with a stationary section secured to cross members using gap brackets and horizontal screws, along with a retainer bar assembly that allows for easy mattress manipulation, reduces deflection and noise by providing structural support and stability through a network of cross members and a motorized actuator assembly for controlled articulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the articulating metal frame is directly attached to the side rails, then the structure is simple and easy to manufacture, but the side rails undergo deflection and bowing under weight, leading to damage
Solution Approach 1:
The patent introduces cross members as intermediary structural elements between the articulating metal frame and the side rails. These cross members act as mediators that distribute the loads and forces, preventing direct stress concentration on the side rails. The cross members are positioned to provide structural support at critical points, thereby reducing deflection and bowing of the side rails while maintaining the overall simplicity of the bed frame construction.
2Device complexity
If vertical screws are used to secure the metal frame to the foundation, then the assembly is simple, but the screws loosen over time allowing frame movement and generating noise
Solution Approach 1:
The patent inverts the traditional vertical screw orientation by using horizontally-oriented screws that extend perpendicular to the side rails. This inversion changes the stress distribution and loading patterns on the fasteners. The horizontal orientation provides more stable anchoring that resists loosening from the articulation movements and weight loads, thereby preventing frame movement and noise generation while maintaining relatively simple assembly procedures.
3Strength
If the side rails are made thicker or more rigid to prevent deflection, then structural strength is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the side rails by introducing cross members at specific intervals along their length. This segmentation creates a multi-level support structure where the cross members bear a portion of the structural load, allowing the side rails themselves to be thinner and less rigid while maintaining overall strength. The segmented approach distributes stresses more effectively and reduces the need for excessively thick or rigid side rails, thereby simplifying manufacturing while improving structural performance.
Data Source
AI summary
An adjustable bed foundation comprises an outer support structure including a head rail, a foot rail, and two parallel side rails. A first pair of cross members extends perpendicularly between the parallel side rails, while a second pair of cross members extends perpendicularly between the first pair of cross members. An articulating frame, which includes a stationary section and a rotating head section pivotally connected to the stationary section, is secured to the second pair of cross members such that the rotating head section extends towards the head rail. The adjustable bed foundation also includes a platform secured to the articulating frame. Adjustable bed assemblies are further provided and include a mattress positioned atop the platform of the adjustable bed foundation.