Gravity-Locking Hinge for Foldable Vehicle Bunks
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Solution Overview
Problem
Existing hinge solutions for foldable vehicle bunks are inadequate in terms of assembly simplicity, disassembly ease, safety, and strength, particularly failing to maintain structural integrity during high forces in crash situations.
Innovation Solution
The hinge design features a circular axle member with flat portions that orientally fit into slots in the wall and bunk members, allowing gravity-assisted assembly and locking, with sloping wall portions for longitudinal guidance and enhanced crash strength through a closed loop connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional hinge solutions are used for foldable vehicle bunks, then assembly and disassembly processes become complex and time-consuming, but using simpler hinge designs reduces the strength and reliability of the connection
Solution Approach 1:
The hinge is divided into separate components: a wall member with circular holes, a bunk member with slots, and an axle member with flat portions. This segmentation allows for simple gravity-assisted assembly while maintaining strong connections through the interlocking geometry of the components.
Solution Approach 2:
The axle member features asymmetric flat portions that correspond to the slot orientations in the wall and bunk members. This asymmetric design creates a unique fitting relationship that ensures proper alignment and prevents accidental disengagement, while still allowing easy assembly through gravity.
2Device complexity
If simple hinge designs are used to reduce manufacturing complexity and cost, then the strength of the hinge is reduced and becomes inadequate for crash situations
Solution Approach 1:
The slots in the wall and bunk members are pre-oriented at specific angles relative to each other. When the axle member is inserted, the flat portions automatically align with these pre-oriented slots, creating a locked configuration that provides strong crash resistance without complex fastening mechanisms.
Solution Approach 2:
The hinge design merges the functions of alignment, locking, and rotation into a single integrated mechanism. The flat portions of the axle member serve both as alignment features during assembly and as locking elements during use, eliminating the need for separate fasteners or complex assembly procedures.
3Ease of operation
If the axle member is designed to be easily inserted and removed, then accidental disengagement may occur compromising safety, but if the connection is more secure, then disassembly becomes difficult
Solution Approach 1:
The hinge design allows the bunk to serve itself during assembly. By tilting the bunk to a mounting position, gravity automatically guides the axle member into the circular holes through the slots, creating a locked connection without requiring tools or additional assembly steps. The same gravitational mechanism prevents accidental disengagement during normal use.
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
This design simplifies assembly and disassembly, ensures safety by preventing accidental disengagement, and maintains structural integrity during crashes by locking the bunk securely to the wall, while allowing free rotation and easy folding.
Implementation Method 1
the flat portions being so oriented that the axle member will pass by gravity down into the circular holes
Implementation Method 2
The bunk may preferably be longitudinally guided at mounting by sloping wall portions of the hinge
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
A hinge (3) for attaching a foldable bunk (2) to a substantially vertical wall (1) in a vehicle comprises a wall member (4) attached to the wall, a bunk member (5) attached to the bunk, and a generally circular axle member (6) for rotatably connecting the bunk member to the wall member. The axle member (6) attached to the bunk member has flat portions (12) for enabling insertion of the axle member into circular holes (9) through slots (10) in the wall member (4). The slots (10) have a width corresponding to the smallest cross-section of the axle member created by the flat portions (12). The slots (10) and the flat portions (12) are so oriented that the bunk (2) with the bunk member (5) can connect to the wall member (4) by gravity in a certain position that it will not assume during use in the vehicle, whereas in all other positions the bunk member (5) is locked to the wall member (4) for relative rotative movements only.