Quick-Adjustable Jack With Coarse-Fine Height Positioning
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Solution Overview
Problem
Existing jacks for travel trailers require numerous rotations of the hand crank to achieve significant changes in operating height, leading to slow and labor-intensive adjustments.
Innovation Solution
A height quickly-adjustable jack design featuring a telescopic component with a hexagonal outer pipe and limiting plate, combined with a load-bearing component that allows for both coarse and fine adjustments, enabling rapid height changes through a flexible and detachable structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the hand crank is rotated to adjust the operating height, then the jack can change height, but it requires many turns and the adjusting speed is very slow
Solution Approach 1:
The height adjustment function is segmented into two independent modes: coarse adjustment through the load-bearing component moving along the outer pipe to the limiting plate, and fine adjustment through the inner pipe telescopic mechanism. This segmentation allows rapid coarse positioning followed by precise fine tuning, dramatically reducing total adjustment time compared to continuous fine adjustment requiring many hand crank turns.
Solution Approach 2:
The load-bearing component is designed to be movable along the outer pipe rather than fixed, enabling dynamic repositioning to different height levels via the limiting plate mechanism. This dynamic capability allows the system to transition between coarse and fine adjustment modes, optimizing the adjusting speed for different operational requirements.
2Ease of operation
If the hand crank is rotated many turns to obtain obvious change in operating height, then the height can be adjusted, but the labor input increases
Solution Approach 1:
The adjustment operation is segmented into two stages: first, the load-bearing component is positioned to the limiting plate for coarse adjustment, requiring minimal manual input; second, the inner pipe telescopic mechanism performs fine adjustment with the hand crank. This segmentation reduces the total manual turns required from many continuous turns to just a few coarse positioning moves plus minimal fine tuning.
Solution Approach 2:
The load-bearing component and limiting plate mechanism enable preliminary coarse adjustment to near-target height before engaging the fine adjustment mechanism. This preliminary action eliminates the need to rotate the hand crank many turns from the starting position, significantly reducing labor input while maintaining ease of operation.
3Adaptability or versatility
If the load-bearing component is fixed on the outer pipe, then the structure is simple, but the height adjustment range and flexibility are limited
Solution Approach 1:
The load-bearing component is segmented from the outer pipe structure, allowing it to move independently along the outer pipe to different positions marked by limiting plates. This segmentation provides multiple height adjustment levels and ranges while maintaining relatively simple individual components that assemble into a functional system.
Solution Approach 2:
The load-bearing component transitions from a fixed state to a movable state along the outer pipe, enabled by the limiting plate mechanism. This dynamic capability expands the height adjustment range and provides flexibility for different operating conditions, while the movement mechanism remains structurally simple and straightforward.
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 design facilitates quick and efficient height adjustments by combining coarse and fine tuning, reducing time and labor, while maintaining structural integrity and compact packaging.
Implementation Method 1
the spring is located between the limiting column and the pipe sleeve
Implementation Method 2
the inner pipe is connected with the outer pipe through the lead screw mechanism, and the hand crank is connected with a lead screw of the lead screw mechanism
Data Source
AI summary
The present disclosure discloses a height quickly-adjustable jack, including a telescopic component and a load-bearing component. The telescopic component is provided with a limiting plate, an outer pipe and an inner pipe. The inner pipe is located inside the outer pipe, and the inner pipe is movably connected with the outer pipe along a center line of the outer pipe. The outer pipe has a hexagonal pipe structure. The limiting plate is fixedly mounted outside the outer pipe and is only connected with one of side surfaces. An extension direction of the limiting plate on the outer pipe is parallel to the center line of the outer pipe. The limiting plate is provided with limiting holes. The load-bearing component is movably mounted on the outer pipe.