Foldable Tent Ridge Purlin Double Pivot Joint
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing collapsible modular tent structures require precise indexing means for immobilization of ridge purlins, which can be complex and interfere with assembly, and lack a simple, robust design for quick assembly and deployment in emergency or military contexts.
Innovation Solution
A collapsible modular structure featuring a ridge purlin with a double pivot joint allowing folding and a removable but rigid connection to arches, utilizing telescopic sections and locking mechanisms for compact storage and optimal mechanical resistance during use, without the need for tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If precise indexing means are used to immobilize the ridge purlin, then the structural stability is improved, but the device complexity increases and assembly becomes more difficult
Solution Approach 1:
The ridge purlin is divided into two separate sections that can be assembled independently. Each section connects to an arch through simplified means, avoiding the need for complex indexing mechanisms. The first section connects via a pivot allowing folding, while the second section uses a removable rigid connection, dividing the complex immobilization function into simpler segmented connections.
Solution Approach 2:
Instead of using complex indexing means to prevent pivoting, the invention uses a pivot joint that allows controlled pivoting motion. The first pivot joint enables the ridge purlin to pivot along a transverse axis for folding, and the second pivot joint allows pivoting along an axis perpendicular to the arch plane. This inverts the approach from restricting motion to controlling motion through simple pivot mechanisms.
2Strength
If the ridge purlin is made rigid and immobilized, then the mechanical resistance is improved, but the ease of assembly and disassembly deteriorates
Solution Approach 1:
The connection system transitions from static rigid connections to dynamic connections that change state during assembly and use. The first connection is a pivot joint that is rigid during use but allows motion during folding. The second connection is a removable rigid connection that provides structural rigidity when assembled but can be easily disconnected for disassembly, eliminating the need for tools.
Solution Approach 2:
The complex indexing means are extracted and replaced with simpler pivot joints and removable connections. The function of immobilization is achieved not through complex indexing but through the geometric constraints of the pivot joints and the rigid removable connection, taking out the unnecessary complexity while maintaining the required stability.
3Volume of moving object
If the structure is designed for compact storage with folding capability, then the volume when dismantled is reduced, but the structural integrity under load may be compromised
Solution Approach 1:
The structure uses dynamic connections that adapt their state based on the operational phase. During storage, the pivot joints allow the ridge purlin to fold parallel to the arch, achieving compact volume. During use, the same pivot joints provide rigid constraints that maintain structural integrity under load, with the second removable rigid connection ensuring the ridge purlin remains immobilized in position.
Solution Approach 2:
The pivot joints serve multiple functions: they enable folding for compact storage, provide rotational freedom during assembly, and constrain motion to maintain structural integrity during use. The first pivot joint handles folding and assembly orientation, while the second pivot joint and removable rigid connection ensure proper positioning and load-bearing capability, making the connection system universally functional across different operational states.
Data Source
Figure 1~3
Figure 4~7
Figure 8~12
AI summary
A foldable modular structure for a fast-erecting tent or similar shelter. The foldable modular structure for a fast-erecting tent or similar shelter consists of the assembly of profiled sections that, in particular, form at least two opposing arches (1, 2) linked by at least two purlins, including one ridge purlin (4). A first end of the ridge purlin (4) is linked by a hinge (6) to a first ridge part (10) of a first arch (1), said hinge (6) comprising first pivoting means (44) allowing said ridge purlin to pivot according to a transverse axis (A5), parallel to the plane of the arch, in order to allow the purlin (4) to fold parallel to said arch, and second pivoting means (61) allowing the ridge purlin to pivot according to an axis (A6) perpendicular to the plane of the arch, and the second end of the ridge purlin comprises linking means (45) for linking with a second ridge part (20) of a second arch (2), said linking means being arranged to provide a dismountable but rigid link between the ridge purlin (4) and said second linking part (20).