Siderail Spring Dampener Linkage Mechanism
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Solution Overview
Problem
Existing hospital bed siderails lack efficient mechanisms to prevent rapid lowering, which can lead to accidents and discomfort, and existing solutions like gas springs or dashpots are costly and less effective.
Innovation Solution
A patient support system incorporating a linkage mechanism with a coil spring dampener, comprising a first and second link that overlap and slide relative to each other, to resist downward movement and assist in lowering the siderail, with a four-bar linkage configuration that biases the siderail toward the lowered position after an overcenter position is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas springs or dashpots are used to prevent rapid lowering of siderails, then the siderail lowering speed is controlled, but the cost and device complexity increase
Solution Approach 1:
The patent combines the dampening function with the existing four-bar linkage mechanism by integrating a coil spring between two links of the linkage. This merging approach eliminates the need for separate gas springs or dashpots, achieving siderail lowering control while reducing device complexity and cost.
Solution Approach 2:
The coil spring dampener utilizes the inherent mechanical motion of the four-bar linkage to automatically control siderail lowering. The spring engages and disengages passively during the siderail's movement through overcenter positions, providing self-regulating dampening without requiring external power sources or complex control systems.
2Reliability
If traditional gas springs are used to control siderail movement, then rapid lowering is prevented, but the cost increases significantly
Solution Approach 1:
The patent replaces expensive gas springs with a simple coil spring that can be manufactured at lower cost. The coil spring integrated into the four-bar linkage provides equivalent rapid lowering prevention functionality while significantly reducing manufacturing expenses and simplifying production processes.
3Object-affected harmful factors
If a dampener mechanism is added to control siderail lowering, then safety is improved, but the device complexity and cost increase
Solution Approach 1:
The dampening function is merged with the existing four-bar linkage mechanism by positioning a coil spring between two links. This integration achieves rapid lowering hazard prevention while minimizing additional complexity, as the spring becomes part of the existing structural system rather than a separate add-on 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 system provides a cost-effective and efficient means to control the movement of siderails, preventing rapid lowering and ensuring smooth operation, while being less expensive than traditional gas springs or dashpots.
Implementation Method 1
The dampener may include a coil spring, a first link coupled to the linkage and having a free end received inside the coil spring, and a second link coupled to the frame and having a free end received inside the coil spring.
Implementation Method 2
The free ends of the links may slide relative to each other.
Data Source
AI summary
A patient support comprises a frame, a siderail, a linkage coupled to the siderail and coupled to the frame to guide movement of the siderail relative to the frame between a raised position and a lowered position, and a dampener. The dampener includes a coil spring, a first link coupled to the linkage and having a free end received inside the coil spring, and a second link coupled to the frame and having a free end received inside the coil spring.