Bunk Bed Frame Joint Assembly to Prevent Post Wobble
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Solution Overview
Problem
Existing bunk bed structures are unstable and difficult to assemble due to inadequate connections between deck frames and supporting posts, leading to wobbling and potential collapse under lateral forces, and require complex assembly processes.
Innovation Solution
A joint arrangement that securely connects upper and lower tubular members with a bed support using a frame locker and elongated fastener, minimizing clearance and rotational movement, and allowing for easy assembly and disassembly by one person without expensive or complicated components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional post fasteners and frame joints are used to connect supporting posts and deck frames, then the bunk bed can be disassembled for storage and shipping, but the connection stability is insufficient and the structure wobbles under lateral force
Solution Approach 1:
The supporting post is divided into upper and lower segments that can be separately assembled, and the connection system is segmented into distinct components (insert, receiver, fastener) that enable easy assembly and disassembly while maintaining stability when connected
Solution Approach 2:
The lower post is inserted into the upper post through a receiver component, creating a nested arrangement where one component fits within another. This nested structure provides stable connection while allowing disassembly by simply removing the nested elements
2Ease of operation
If clearances are formed between components to enable connection, then assembly is possible, but the overall structure becomes unstable and wobbles under lateral force
Solution Approach 1:
The connection components have non-circular cross-sections (square or rectangular) at the insertion and reception points, creating a localized geometric feature that prevents rotation and lateral movement. This local geometric constraint eliminates clearances in critical directions while maintaining ease of assembly along the insertion axis
Solution Approach 2:
The insert and receiver components use asymmetric non-circular cross-sections that allow insertion in one direction but prevent withdrawal and lateral movement. The asymmetric geometry provides inherent anti-rotation capability and eliminates clearances that would cause wobbling
3Adaptability or versatility
If joints are formed at the supporting post between upper and lower deck frames, then connection is achieved, but the rigidity of the supporting post is substantially weakened
Solution Approach 1:
The connection functionality is extracted from the supporting post itself and placed into separate dedicated components (insert and receiver). This extraction allows the post to remain as a simple, rigid structural element while the connection capabilities are provided by specialized components that do not compromise post strength
4Stability of the object's composition
If complex connection methods are used to improve stability, then connection strength may improve, but assembly becomes difficult and time-consuming
Solution Approach 1:
The insert component is pre-assembled into the upper post before final assembly, and the lower post is prepared with alignment features. This preliminary preparation enables rapid final assembly by simply inserting and securing components without complex alignment procedures during final assembly
Data Source
AI summary
A bed frame includes a longitudinal supporting member, a joint arrangement, an upper tubular member having a receiving portion and an upper connecting hole, a lower tubular member having an inserting portion and a lower connecting hole, wherein the inserting portion of the lower tubular member is slidably inserted into the receiving portion of the upper tubular member at a position that the upper and lower connecting holes are coaxially aligned with each other. The joint arrangement includes a frame locker provided at an end of the longitudinal supporting member and an elongated fastener extended through the upper and lower connecting holes to securely fasten with the frame locker so as to securely lock up the upper tubular member, the lower tubular member, and the bed support together.