Hospital Bed Safety Rail Assembly With Pivoting Posts
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Solution Overview
Problem
Existing safety devices for hospital and care beds are either mechanically complex, expensive, and unstable when used as handles, or they protrude too much, causing difficulties in accessing the bed frame and wheel brake, and may not provide sufficient protection against falls while being easy to open for caregivers.
Innovation Solution
A compact safety device with pivotably mounted posts and guide elements for sliding longitudinal beams, allowing for a space-saving design that can be easily attached to beds without removable parts, providing robust protection and easy operation while minimizing obstruction and visibility of functional elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the post is designed with longitudinal displacement and pivoting movement, then the post can be folded away to save space, but the mechanical complexity increases and the cross-section becomes larger
Solution Approach 1:
The post mounting is divided into two functional segments: a pivoting movement for folding the post away, and a locking mechanism for securing it in position. This segmentation allows each part to perform its specific function efficiently without requiring complex combined mechanisms.
Solution Approach 2:
The post is designed to be dynamic, allowing it to pivot between a vertical protective position and a horizontal folded position. This dynamic capability enables the post to adapt to different operational states (protection mode vs. space-saving mode) without requiring multiple components.
2Adaptability or versatility
If the post is mounted with longitudinal slot and sliding block, then the post can be raised and folded, but the manufacturing cost increases and the structure becomes less stable when used as handle
Solution Approach 1:
The complex mechanical system of longitudinal slots and sliding blocks is replaced with a simpler pivoting mounting. The post rotates directly on a pivot point, eliminating the need for guiding slots and sliding components, thereby reducing manufacturing complexity and cost.
Solution Approach 2:
Instead of allowing the post to slide vertically within a slot and then pivot, the design inverts the sequence by providing only pivoting movement. The post is raised by lifting during the pivoting motion itself, rather than requiring separate longitudinal and rotational degrees of freedom.
3Reliability
If the safety device protrudes downwards to provide protection, then fall protection is improved, but accessibility to bed frame and wheel brake becomes difficult
Solution Approach 1:
The post is designed as a dynamic element that can pivot between a vertical position (providing fall protection) and a horizontal position (clearing the path to the bed frame). This dynamic reconfiguration allows the same structure to serve both protective and accessible functions at different times.
Solution Approach 2:
The safety device is segmented into the post element and the longitudinal bars. The post provides the primary protective function when vertical, while the longitudinal bars can be independently positioned. This segmentation allows different parts to fulfill different functions without interfering with each other.
4Reliability
If the post cross-section is enlarged to improve handling stability, then the post is more stable when used as handle, but the visual impression becomes more annoying and space is increased
Solution Approach 1:
The post cross-section is optimized with local quality variations: the guide area has a specific width for stable handling, while other portions of the post maintain a slimmer profile. This localized optimization provides handling stability where needed without unnecessarily increasing the overall visual bulk of the post.
Solution Approach 2:
The post cross-sectional dimensions are carefully parameterized, with the guide area width specifically optimized to provide sufficient handling stability. The overall post dimensions are kept minimal, creating a balance between functional requirements (stable grip) and aesthetic/ spatial considerations.
Data Source
Figure 1~2
Figure 3~5
Figure 4
AI summary
The device (2) has a vertical element (10) that is pivotably mounted against a vertical element lower part for fastening the device to a hospital or care bed (1). Two longitudinal elements (20a, 20b) have a guide element at one of axial ends for sliding guidance along the vertical element, where the guide element partly engages the vertical element. A guide region is provided exactly at the vertical element for guiding the guide element. The device is implemented as an assembly separated from a head part (9) and a foot part (8) of the bed. An independent claim is also included for a hospital or care bed comprising a head part.