Pneumatic Lifting for Neutral Thread Loading and Soft Mating
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Solution Overview
Problem
Conventional lifting devices face challenges in minimizing loading on threaded mating surfaces to prevent damage and maximizing tactile feel during assembly or disassembly, as they often require constant operator manipulation due to stiff interfaces and exhibit significant motion damping.
Innovation Solution
A pneumatically adjustable lifting apparatus using inflatable spring devices that adjust pressure based on load variations, combined with linear recirculating ball bearings to minimize vertical motion damping, allowing for neutral thread-loading and precise placement with timed incremental movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If non-compressible hydraulic fluid is used for vertical positioning control, then fine positioning control is achieved, but the interface becomes very stiff with no compliance requiring constant operator manipulation
Solution Approach 1:
The patent replaces non-compressible hydraulic fluid with compressible pneumatic springs (air springs) to provide vertical positioning control. The air springs provide compliance through gas compression while maintaining positioning accuracy, eliminating the need for constant operator manipulation during thread-mating operations.
Solution Approach 2:
The patent changes the physical state of the positioning medium from liquid (non-compressible) to gas (compressible). This parameter change introduces compliance to the system while maintaining fine positioning control capability, allowing the interface to yield slightly under load variations without requiring constant operator adjustment.
2Object-affected harmful factors
If conventional lifting devices are used to minimize loading on threaded mating surfaces, then thread damage is avoided, but significant motion damping occurs reducing tactile feel
Solution Approach 1:
The patent uses pneumatic springs instead of conventional hydraulic systems to support the load. The compressible nature of pneumatic springs provides motion damping reduction while maintaining soft mating characteristics that protect threaded surfaces from damage during assembly operations.
Solution Approach 2:
The patent introduces a dynamic, compliant positioning system using air springs that can adapt to load variations in real-time. This dynamic system reduces motion damping compared to rigid conventional devices while maintaining the soft interface needed to protect threaded surfaces during the mating process.
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 apparatus provides lightly damped vertical travel with a linear force profile over a wide displacement range, enabling operators to maintain neutral thread-loading and precise assembly or disassembly of large threaded connections without constant operator intervention.
Implementation Method 1
The pneumatically adjustable lifting apparatus utilizes inflatable spring devices to lift and precisely place a load at a desired location. Pneumatic pressure in the inflatable spring devices may be adjusted depending upon the particular load.
Implementation Method 2
Variations in the forces produced by the load cause the inflatable spring devices to expand or compress thereby allowing soft mating between components
Implementation Method 3
Linear recirculating ball bearings cooperate with the linear loading characteristics of the inflatable spring devices to minimize the vertical motion damping.
Data Source
AI summary
A pneumatically adjustable lifting apparatus utilizes inflatable spring devices for lifting and precisely positioning a load at a desired location. Variations in the forces produced by the load cause the inflatable spring devices to expand or compress thereby allowing soft mating between components that need to be connected together, such as assembling or disassembling large threaded connections. Pneumatic pressure in the inflatable spring devices may be adjusted depending upon the particular load. The pneumatically adjustable lifting apparatus provides lightly damped vertical travel with a substantially linear force profile over a relatively wide displacement range. Recirculating linear ball bearings cooperate with the linear loading characteristics of the inflatable spring devices to minimize the vertical motion damping of the pneumatically adjustable lifting apparatus.