Commercial Vehicle Bunk Restraint Bar With Planar Bed-Frame Support
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Solution Overview
Problem
Existing safety devices for bunk beds in commercial vehicle cabs are either complex or costly, failing to provide a structurally simple and functionally reliable support during forces applied due to braking or crashes.
Innovation Solution
A securing element with a planar contact surface that surrounds the bed frame in a U-shape, using a combination of tongue and groove, screw, and snap-in connections for secure attachment, providing both force and moment support while being easy to produce and assemble.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one-piece safety bar is used that protrudes freely from the pivot bearing, then the device structure is simple, but the support reliability under applied forces is insufficient
Solution Approach 1:
The securing element is divided into a head portion and a support portion that are detachably connected. The support portion can be selectively positioned to provide planar support at multiple locations along the bed frame, while the head portion provides the pivoting restraint function. This segmentation allows the device to achieve both structural simplicity and reliable support under applied forces.
Solution Approach 2:
A detachable connection mechanism (tongue and groove connection with fastening element) is introduced as an intermediary between the head portion and support portion. This intermediary allows the securing element to be assembled in a simple manner while providing reliable planar support when engaged, resolving the contradiction between simplicity and reliability.
2Reliability
If a securing element provides planar support on the bed frame, then the restraint function under applied forces is improved, but the device complexity increases
Solution Approach 1:
The securing element is segmented into functional portions: the head portion for pivoting restraint and the support portion for planar support. This segmentation allows each portion to be optimized for its specific function while keeping the overall device relatively simple through selective engagement of the support portion at multiple possible locations.
Solution Approach 2:
The support portion is designed to engage with the bed frame at multiple different locations along its length, providing universal support capability. The bed frame includes multiple engagement features that allow the support portion to be positioned optimally for different restraint scenarios, making the device multi-functional without significantly increasing complexity.
3Reliability
If multiple connection types (tongue and groove, screw, snap-in) are used for attaching the securing element to the bed frame, then the attachment reliability is improved, but the ease of manufacture decreases
Solution Approach 1:
The connection system is segmented into modular components: the tongue portion on the securing element, the groove portion on the bed frame, and optional fastening elements. This segmentation allows each connection type to be independently optimized and manufactured, then assembled together to provide reliable attachment without requiring complex integrated manufacturing processes.
Data Source
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AI summary
The safety device comprises a safety element (9) that is arranged on a sleeping couch (1). The safety element is provided with a contact area. The contact area of the safety element is placed opposite to a bed-frame contact area of a bed frame (2) of the sleeping couch in a laminar contact connection. The safety element is supported by the laminar contact connection on the bed-frame with a force application. The safety element and the bed frame are made of light metal or plastic.