Bed Width Adjustment via Crank and Cable Mechanism
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Solution Overview
Problem
Existing hospital beds with adjustable dimensions are either manually operated, requiring multiple manipulations and being time-consuming, or motorized, which is expensive and cumbersome, and there is a need for a more efficient system to adjust the bed's width for easier movement and use in various settings.
Innovation Solution
An adjusting system for patient support apparatuses featuring a central resting surface, a panel section that can move between retracted and extended positions, a handle assembly, an extending member, and a clutch assembly that engages the handle and extending member, allowing for smooth and controlled movement of the panel sections using a gear assembly and an optional electric actuator for easier operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual manipulation is used to adjust bed width, then device complexity is reduced, but operation time increases and productivity decreases
Solution Approach 1:
The patent replaces complex motorized mechanical systems with a simplified manual crank mechanism coupled with a cable-pulley system. The crank assembly (210) with handle (214) converts rotational motion into linear cable tension, which then actuates the panel sections through the cable (235) and pulley (245) system, achieving automated-adjustment-speed with minimal mechanical complexity
Solution Approach 2:
The patent introduces flexible cables (235) as intermediary elements that transmit force from the single crank mechanism to multiple panel sections. The cables act as mediators that distribute the mechanical force efficiently, allowing one manual input to control multiple moving parts simultaneously without requiring complex direct mechanical linkages
2Ease of operation
If multiple motors are used for automating bed extension, then operation ease is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the function of multiple motors into a single integrated crank assembly (210). The crank mechanism consolidates what would otherwise require separate power sources for each panel section, reducing system complexity while maintaining ease of operation. The single crank handle (214) controls all panel extensions through the cable-pulley intermediary system
Solution Approach 2:
The single crank assembly (210) serves multiple functions: it can extend and retract multiple panel sections, control bed width adjustment, and potentially lock positions. This multi-functional design replaces what would traditionally require multiple specialized motors, reducing overall system complexity while preserving operational convenience
3Area of stationary object
If larger bed dimensions are provided, then patient comfort is improved, but mobility and adaptability decrease
Solution Approach 1:
The patent makes the bed structure dynamic by introducing movable panel sections (123b, 233b) that can be extended or retracted based on spatial requirements. The bed transitions from a fixed static structure to a dynamic one where the width can be adjusted in real-time, allowing the same bed to adapt to different mobility constraints and comfort needs
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 allows for efficient and controlled adjustment of the bed's width, reducing the need for multiple manipulations and minimizing the complexity and cost associated with motorized systems, while ensuring safe operation and preventing damage from excessive force or resistance.
Implementation Method 1
the clutch assembly urging movement of the extending member upon actuation of the handle assembly below a defined resistance level of the extension member while preventing rotation of the extension member above or equal to the defined resistance level
Implementation Method 2
smooth and controlled movement of the panel sections using a gear assembly
Data Source
AI summary
An adjusting system for adjusting a configuration of a bed, the bed comprising a central frame and a side panel movable relative to the central frame, is disclosed. In one embodiment, the adjusting system is provided with a clutch assembly. In another embodiment, the adjusting system is provided with a telescopic handle assembly.