Telescopic Jacking Device with Screw Threads for Load Stability
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Solution Overview
Problem
Hydraulic and pneumatic jacks used for lifting heavy machinery in maintenance and repair applications are prone to failure, posing safety risks to personnel, especially in outdoor environments where the machinery can be unstable and hazardous.
Innovation Solution
A jacking device with a base member, upper member, and intermediate members featuring screw threads and drive means, including a primary and backup drive system, a gear device, and a controller for safe and controlled elevation and lowering of loads, ensuring stability and safety even in case of hydraulic system failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic or pneumatic jacks are used to lift heavy machinery, then the machinery can be elevated to the required height, but the system is prone to failure and leakage posing safety risks to personnel
Solution Approach 1:
The jacking device is divided into multiple independent telescopic stages (first stage, second stage, third stage, etc.), where each stage can be controlled independently. This segmentation allows the load to be distributed across multiple stages, and if one stage fails, the others can still support the load, thereby improving reliability while maintaining manageable system complexity through modular design
Solution Approach 2:
The patent incorporates backup support mechanisms and interlocking features in advance within the telescopic structure. The intermediate members include features that provide automatic support or load transfer capabilities if a primary support element fails, cushioning against the harmful effects of failure before they can cause catastrophic consequences to personnel safety
2Reliability
If packing material is installed under the elevated machinery to minimize risk, then personnel safety is improved during maintenance, but the time required for installation and removal of packing increases the duration of hazardous exposure
Solution Approach 1:
The telescopic jacking device is designed to maintain the elevated position of machinery through its own structural integrity and mechanical locking features, without requiring external packing materials. The device serves itself by providing inherent stability through its multi-stage telescopic design with intermediate members that can be locked at various positions, eliminating the need for additional safety measures and the time associated with their installation and removal
3Length of stationary object
If a single-stage jack is used, then the device structure is simple, but it cannot elevate the load to a relatively high elevation required for maintenance work
Solution Approach 1:
The patent employs a nested telescopic structure where intermediate members are housed within one another in a doll-like configuration. The first intermediate member is nested within the base member, the second intermediate member within the first, and so on. This nesting allows the device to achieve significant elevation height when extended while maintaining a compact form factor when retracted, and the modular nested design keeps the overall structure manageable despite the multiple moving parts
4Reliability
If the telescopic device is extended to high elevation, then maintenance personnel can work safely underneath, but the device becomes more vulnerable to external forces such as wind in outdoor environments
Solution Approach 1:
The telescopic jacking device incorporates dynamic adjustment capabilities where intermediate members can be extended or retracted independently to adjust the center of gravity and distribution of the load. This dynamic adjustability allows the device to adapt to external forces such as wind by redistributing loads across different stages, maintaining stability even when extended to high elevations in outdoor environments
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 device provides enhanced safety by allowing controlled elevation and stabilization of heavy loads, minimizing the risk of accidents and enabling safe maintenance and repair operations, with the ability to transfer loads to screw threads in case of hydraulic failure, ensuring stability and safety.
Implementation Method 1
a threaded shaft associated with either said base member or said movable member; a guide means associated with the other of said base member or said movable member, said guide means including a threaded surface which is adapted to cooperate with said threaded shaft
Implementation Method 2
Such jacks are typically hydraulic or pneumatic jacks, which rely on fluid being maintained under constant high pressure
Implementation Method 3
Such jacks are typically hydraulic or pneumatic jacks, which rely on fluid being maintained under constant high pressure
Data Source
AI summary
A jacking device includes a base member, an upper member, and, at least one intermediate member. Each member includes screw threads adapted to engage a respective screw thread of an adjacent member. Drive means is included to permit movement of the members, and to thereby raise or lower an upper surface of the jacking device. The intermediate member may rotate as the drive means operates, but the upper and lower surfaces are preferably prevented from undergoing rotational movement. A plurality of such jacking devices may be operated simultaneously to raise or lower a load or other object.