Hospital Bed Side Rail Spring Locking Mechanism
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Solution Overview
Problem
Existing side rails for beds lack simplicity in transitioning between open and closed positions, are not aesthetically pleasing in the open position, and are costly to produce while ensuring stability and safety against falls.
Innovation Solution
A side rail design featuring pivotably mounted posts with a locking mechanism, a spring element to maintain the use position, and an extension element that can be lengthened to cover the bed, ensuring stability and ease of operation while being cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is provided to ensure stability in the use position, then the side rail cannot unintentionally pivot into the non-use position, but the device complexity increases
Solution Approach 1:
The spring element automatically maintains the side rail in the use position by exerting a force of at least 15 N on the free end of the post, without requiring manual intervention or complex control systems. The mechanism self-regulates to prevent unintentional pivoting while keeping the structure simple
Solution Approach 2:
The patent replaces complex mechanical locking systems with a simpler spring-based force application system. The spring element provides continuous force to maintain stability, substituting for more complex cam-based or multi-component locking mechanisms while achieving the same reliability goal
2Reliability
If the side rail is designed to be completely visible and functional in the open position, then safety is maintained, but the aesthetic appearance deteriorates
Solution Approach 1:
The side rail is divided into separate posts that can be independently positioned. When in the non-use position, the posts are aligned essentially along the longitudinal direction of the bed, creating a sleek, minimal appearance while maintaining the capability to provide safety when needed
3Reliability
If a high force is exerted on the side rail in the use position to prevent unintentional opening, then stability is improved, but the manufacturing cost increases
Solution Approach 1:
The spring element is designed to exert a specific force parameter of at least 15 N on the free end of the post, which is optimized to be the minimum force required to prevent unintentional opening. This parameter optimization allows using standard, cost-effective spring components rather than requiring high-force, expensive industrial springs
Solution Approach 2:
The spring element is designed as a simple, inexpensive component that can be easily manufactured and replaced if needed. By using a basic spring mechanism rather than a complex high-force locking system, the patent achieves the required stability with a cost-effective, easily manufacturable component
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 side rail design allows for effortless transition between use and non-use positions, provides enhanced stability and safety, and is cost-effective to produce, while maintaining an attractive appearance and preventing unintentional pivoting.
Implementation Method 1
a spring element exerts a force on the side rail that holds the side rail in the position of use
Implementation Method 2
the force of gravity exerted on the side rail predominates and the side rail can rest stably in the non-use position
Data Source
Figure 1~3
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Figure 7~8
AI summary
A hospital and/or care bed (1) comprising a side-rail arrangement which has at least two posts (30, 70), each mounted to be pivotable relative to the frame of the bed via a lower rotational point (32, 72), said posts are pivotable between at least one upright position, with which the side rails are in a use position, and a non-use position, with which, in particular, the posts (30, 70) are aligned substantially along the longitudinal direction of the bed. The side-rail arrangement has at least one bar (40) which is mounted to be pivotable relative to the posts (30, 70) via upper post rotational points (44, 45), wherein a locking (47) or clamping is provided for the side-rail arrangement in the use position. When the side-rail arrangement is in the use position, a spring element (39) exerts a force on the side-rail arrangement, said force holds the side-rail arrangement in the use position and the amount of said force corresponds to a force of at least 25 N acting on the free end of one of the posts in the longitudinal direction of the bar.