Bunk Bed Lower Frame Locking Assembly to Reduce Shaking and Torsion
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Solution Overview
Problem
The stability of the lower bed frame in a double-layer iron frame bed is weak due to the hooking connection between the column and transverse bar, which leads to shaking and limited strength, and the transverse bar bears excessive torsion, while the supporting feet can be easily kicked and twisted, compromising its supporting role.
Innovation Solution
A lower side bed frame design featuring two symmetrically parallel transverse and longitudinal rods, four columns, supporting feet, and a connecting rod, with locking pieces and bolts securing the structure, forming a solid T-shaped configuration that enhances stability and resistance to deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hooking connection is used between the column and transverse bar, then the structure is simple and easy to assemble, but the transverse bar shakes violently and stability is poor
Solution Approach 1:
The locking piece integrates multiple functions: it locks the transverse bar to the column, prevents rotation, and provides mounting points for bolts. By merging these functions into a single component rather than using separate hooking elements, the structure achieves both ease of assembly and violent shaking prevention.
Solution Approach 2:
The locking piece is pre-installed on the transverse bar with built-in locking mechanisms (teeth engaging with grooves) that automatically secure the column in place during assembly. This preliminary preparation of locking features eliminates the need for complex post-assembly adjustments and prevents violent shaking from the outset.
2Strength
If bolts are used to lock the column and transverse bar, then the connection strength is improved, but the installation becomes troublesome and complex
Solution Approach 1:
The locking piece serves as an intermediary component between the transverse bar and column. It provides pre-formed locking features (teeth and grooves) that guide and secure the connection, eliminating the need for complex bolt-hole alignment and multiple fastening steps while maintaining strong mechanical connection.
Solution Approach 2:
The locking mechanism is segmented into discrete features: locking teeth on the locking piece, corresponding grooves on the column, and bolt engagement surfaces. This segmentation allows each feature to perform its specific function independently, simplifying the overall assembly process while ensuring strong connection through multiple localized contact points.
3Length of moving object
If the transverse bar length is increased to provide better support, then the supporting span is improved, but the transverse bar bears greater torsion and twists during use
Solution Approach 1:
The locking piece introduces localized reinforcement at the critical connection points where the transverse bar meets the column. By concentrating locking teeth, bolts, and structural features at these specific locations rather than uniformly strengthening the entire bar, the design provides enhanced torsion resistance exactly where needed without unnecessarily increasing overall bar length or weight.
4Strength
If a supporting foot is added below the middle position of the transverse bar to improve strength, then the supporting capability is enhanced, but the supporting foot can be easily kicked and twisted by users
Solution Approach 1:
The locking piece merges the supporting function with the connection function. By integrating the support structure into the same component that locks the transverse bar to the column, the design achieves both supporting strength and impact resistance without adding separate vulnerable supporting elements that can be easily kicked or twisted.
Data Source
AI summary
A lower side bed frame of a double-layer iron frame bed comprises two transverse rods, two longitudinal rods, and four columns. An upper end of a lower column comprises a joint section formed by reducing a diameter. An upper column is sleeved on the joint section. An end surface of each of the two transverse rods is connected with a locking piece, and the locking piece abuts outer sides of the upper column and the lower column. An upper bolt enables the locking piece, the upper column, and the joint section to be locked together. A lower bolt enables the locking piece and the lower column to be locked together. Two supporting feet are located below a middle position of the two transverse rods. A connecting rod is connected between the two supporting feet and pulls the two supporting feet in a longitudinal direction.