RV Rear Expansion Structure With Sliding Frame and Foldable Floor
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Solution Overview
Problem
Existing rear expansion structures for recreational vehicles face issues such as large interior space occupation, structural complexity, high costs, difficulty in water prevention and sealing, and complicated operation, whether they are pullable, foldable, or a combination of both.
Innovation Solution
A pullable-foldable combined rear expansion structure for recreational vehicles, featuring a rigid frame formed by side and rear plates, with guide rails and rollers for smooth movement, and integrated waterproofing and insulation, allowing one-step deployment and retraction through handles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pullable structure with electric motor and rack-pinion mechanism is used, then telescopic expansion can be realized conveniently, but large interior space is occupied and structural complexity increases
Solution Approach 1:
The patent replaces the complex electric motor-driven rack-pinion mechanism with a simpler manual pulling system. The expansion box is directly pulled along the guide rail without requiring reduction mechanisms, belt pulleys, or complex gear systems, thereby reducing structural complexity while maintaining ease of operation.
Solution Approach 2:
The patent removes unnecessary components from the expansion system. By eliminating the electric motor, reduction mechanism, and complex linkage systems, the design achieves telescopic expansion with minimal structural elements, reducing both complexity and interior space occupation.
2Adaptability or versatility
If a pullable structure with expansion box is used, then expansion function is achieved, but water prevention and sealing at the joint becomes difficult
Solution Approach 1:
The patent employs flexible sealing structures at the joint between the expansion box and the compartment. The sealing mechanism uses flexible materials and designs that can accommodate the relative movement between stationary and movable parts while maintaining water prevention and sealing effectiveness throughout the expansion range.
3Volume of moving object
If a foldable structure with multiple movable plates is used, then the structure can be compact when folded, but the operation becomes complicated and reliability decreases
Solution Approach 1:
The patent divides the expansion system into two distinct parts: a stationary compartment and a movable expansion box. This segmentation allows the expansion box to slide along the guide rail without requiring multiple folding operations, simplifying the operation while achieving compact storage when folded.
Solution Approach 2:
The patent implements a dynamic sliding mechanism where the expansion box moves along the guide rail. This dynamic design allows for smooth expansion and retraction operations without the complexity of multiple hinge joints and folding sequences, improving both ease of operation and reliability.
4Volume of moving object
If a foldable structure with hinge joints is used, then compact folding is achieved, but waterproofing, sound insulation, and heat insulation become difficult
Solution Approach 1:
The patent uses flexible sealing structures at the interface between the expansion box and compartment that maintain waterproofing, sound insulation, and heat insulation properties. The sealing design accommodates the sliding movement while preserving thermal and acoustic insulation, avoiding the problems associated with multiple hinge joints.
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
The structure minimizes interior space occupation, ensures easy operation, provides effective waterproofing and insulation, and prevents external elements from entering the compartment during expansion and contraction.
Implementation Method 1
guide rails and rollers for smooth movement
Implementation Method 2
a front end of the front bottom plate is rotatably connected to a bottom of a compartment, a rear end of the front bottom plate is rotatably connected to a front end of the rear bottom plate, and a rear end of the rear bottom plate is rotatably connected to the frame
Data Source
AI summary
A pullable-foldable combined rear expansion structure includes side plates, a rear plate, bottom plates, a top plate, and a guide rail. The side plates includes left and right side plates. The left side plate and the right side plate are connected to the rear plate to form a rigid frame. The bottom plates include a front bottom plate and a rear bottom plate. A front end of the front bottom plate is rotatably connected to a bottom of a compartment. A rear end of the front bottom plate is rotatably connected to a front end of the rear bottom plate. A rear end of the rear bottom plate is rotatably connected to the frame. The frame is connected to the compartment through the guide rail, the top plate is at an outer side of the frame, and an upper end of the top plate is rotatably connected to the compartment.