Hospital Bed Safety Rail Gas Spring Locking Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hospital bed safety rails face issues with unreliable immobilization between raised and lowered configurations, requiring excessive force to raise and potentially sudden collapse from raised to lowered positions.
Innovation Solution
A bed safety rail design featuring pivotally mounted end supports and a gas spring between the rail section and end supports, allowing the rail to maintain a horizontal orientation during rotation and utilizing locking means to secure the rail in the top position without additional locking devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical blocking means with locking pin and spring is used, then the side rail can be locked in place, but the side rail cannot be reliably immobilized and may suddenly collapse
Solution Approach 1:
The patent removes the separate blocking means (locking pin, spring, locking hole) from the system and integrates the locking function directly into the gas spring mechanism itself. The gas spring's piston and cylinder structure inherently provides both support and locking capability, eliminating the need for additional separate locking components and reducing overall device complexity while improving reliability.
Solution Approach 2:
The patent combines the support function and locking function into a single integrated gas spring mechanism. The gas spring simultaneously provides the force to hold the rail in position and the mechanical locking through its piston-cylinder interaction, merging multiple functions into one component to reduce complexity and improve reliability.
2Ease of operation
If a mechanical blocking means with locking pin is used, then the side rail can be locked, but excessive force is required to raise the side rail
Solution Approach 1:
The patent employs a gas spring (pneumatic element) to provide the lifting and locking force. The gas spring uses compressed gas to generate controlled force that assists in raising the rail section and maintaining it in the elevated position, significantly reducing the manual force required compared to pure mechanical systems.
Solution Approach 2:
The gas spring acts as a counterweight mechanism, providing an upward force that counteracts the weight of the rail section. This reduces the net force that must be applied manually to raise the rail, making operation easier while the gas spring's locking feature prevents sudden collapse.
3Reliability
If a separate locking device is used to secure the rail, then the rail can be locked, but the device complexity increases
Solution Approach 1:
The patent extracts and removes the separate locking device from the system. Instead of having an independent locking mechanism, the locking function is embedded within the gas spring's operational structure, where the piston and cylinder interaction naturally provides both support and locking without requiring additional components.
Solution Approach 2:
The gas spring serves multiple functions simultaneously: it provides the lifting force, maintains the rail in the elevated position, and provides mechanical locking. This multi-functionality eliminates the need for separate locking devices, reducing complexity while maintaining reliable locking capability.
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 solution provides a reliable, easy-to-use, and maintenance-free safety rail that requires less force to raise and prevents sudden collapse, ensuring the safety of both patients and caregivers by maintaining a stable configuration.
Implementation Method 1
a gas spring disposed between the rail section and the end support
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a bed, especially hospital bed safety rail (2), which is attached to a lengthwise (A-A) side of a bed (1). The safety rail comprises two end supports (3, 4) disposed at a distance from each other, and at least one rail section (5; 51, 52, 53, 54) disposed between the end supports (3, 4) substantially in a longitudinal direction of the bed. The end supports (3, 4) are mounted pivotally in engagement with the bed, such that the end supports are rotatable from a position inclined in the longitudinal direction of the bed to an upright position as the safety rail (2) is raised from a bottom position (B) to a top position (C), and respectively rotatable in an opposite direction as the safety rail is lowered from the top position to the bottom position. Thereby, the rail section (5; 51, 52, 53, 54) being retains, despite the rotating motion, its substantially horizontal orientation. According to the invention, the safety rail (2) further comprises a gas spring (6) disposed between the rail section (5; 51) and the end support (3).