Variable chair type electric bed
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Solution Overview
Problem
Variable chair type electric beds often cause users to fall off due to instability when transitioning from a bed to a chair configuration, as the seat board becomes straight and lacks sufficient tilt to maintain balance.
Innovation Solution
The electric bed features a bed board set with hinged bed boards and an electric telescopic rod, where the outermost bed board tilts upwards when the bed converts to a chair, supported by a guide part that allows the telescopic rod to lift and swing, maintaining a stable seating position by adjusting the gravity center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bed board is kept in a horizontal state to serve as a seat board, then the transformation is simple, but the user stability deteriorates and the user may fall off
Solution Approach 1:
The patent applies local quality by differentiating the orientation of different bed boards. Specifically, the first bed board (seat board) is tilted at an angle between 0-15 degrees relative to the horizontal, while the second bed board (backrest) is positioned vertically. This localized angular differentiation provides both stability and comfort without requiring complex overall structural changes.
Solution Approach 2:
The guide part is designed to preliminarily constrain the motion trajectory of the electric telescopic rod before the actual transformation occurs. The guide groove pre-determines that the extending end will follow a path that naturally results in the first bed board tilting upward, preventing the board from remaining horizontal and thus preventing user instability before the transformation is even complete.
2Reliability
If the bed board is tilted upwards to improve stability, then the user safety improves, but the device complexity increases due to the guide part constraints
Solution Approach 1:
The guide part acts as an intermediary mechanism between the electric telescopic rod and the bed board. Rather than directly controlling the bed board's tilt angle, the guide part constrains the telescopic rod's extending end to follow a specific trajectory (guide groove), which indirectly achieves the desired bed board tilting effect. This intermediary approach simplifies the overall control system while ensuring safety.
Solution Approach 2:
The guide groove is designed with a curved trajectory rather than a straight line. This curved path ensures that as the electric telescopic rod extends, the first bed board naturally tilts upward in a smooth, controlled manner. The curvature of the guide groove translates linear telescopic motion into rotational bed board motion, achieving the safety tilt without complex mechanical linkages.
3Device complexity
If the electric telescopic rod extends vertically, then the lifting motion is simple, but the bed board cannot achieve the required tilt angle
Solution Approach 1:
The guide groove introduces a second dimensional constraint to the telescopic rod's motion. While the telescopic rod itself moves in a linear fashion (one dimension), the guide groove constrains it to follow a curved path in a two-dimensional plane. This dimensional transformation converts simple linear extension into complex rotational motion of the bed board, achieving the required tilt angle without complicating the telescopic rod's own mechanism.
Data Source
AI summary
The present disclosure relates to the technical field of electric beds, and discloses a variable chair type electric bed. The variable chair type electric bed comprises a bed frame, a bed board set, an electric telescopic rod and a guide part. After the electric bed is changed into a chair, one end of a bed board serving as a seat board is tilted, so that a human body can sit more stably and safely.