Pivot Shaft Handling with Controlled One-Side Load Application
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Solution Overview
Problem
Existing devices for handling shafts forming pivoting links between parts lack efficiency in both insertion and extraction, particularly in controlling the load applied during these operations and simplifying maintenance processes.
Innovation Solution
A device comprising a body with a threaded outer portion and a bore, a threaded rod, a butterfly nut, an expandable clamping ring, a compression nut, and return means, which allows for controlled and constant load application during insertion and extraction, enabling easy handling and maintenance of shafts by blocking translation in one direction and decompressing in another.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional extraction module with detection system is used to detect resistance and control shaft disengagement, then the load control during extraction is improved, but the device complexity increases due to additional detection systems and control mechanisms
Solution Approach 1:
The patent replaces the detection system and electronic control mechanisms with a purely mechanical load control system. The threaded rod, butterfly nut, and expandable clamping ring create a mechanical feedback system that automatically controls the extraction load through physical constraints and force distribution, eliminating the need for sensors and electronic controllers while maintaining reliable load management
Solution Approach 2:
The mechanical components self-regulate the extraction process through inherent mechanical properties. The expandable clamping ring automatically adjusts its grip based on the shaft's presence, and the threaded rod with butterfly nut creates a self-limiting mechanical advantage system that controls force application without external monitoring or control systems
2Reliability
If the shaft is handled from both sides of the pivoting link, then the extraction process is more balanced, but the ease of operation decreases due to requiring access from multiple sides
Solution Approach 1:
The patent transitions from a two-sided extraction approach to a one-sided operation by introducing a bearing member that provides support and reaction force from the single accessible side. The bearing member creates a mechanical lever system where the threaded rod and butterfly nut assembly can generate sufficient extraction force from one side by utilizing the bearing member as a reaction point, eliminating the need for simultaneous access from both sides
3Manufacturing precision
If the body is constrained to move only in translation along the longitudinal axis, then the manufacturing precision is improved, but the adaptability decreases due to restricted movement freedom
Solution Approach 1:
The patent employs dynamic elements including the expandable clamping ring that can radially expand and contract, and the threaded rod with butterfly nut that converts rotational motion to linear motion while allowing controlled translation. These dynamic components enable the body to adapt its configuration during operation while maintaining precise controlled movement along the longitudinal axis, achieving both manufacturing precision and operational versatility
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 simplifies and speeds up the handling of shafts by allowing controlled load application and constant load management during insertion and extraction, facilitating rapid maintenance operations while ensuring the shaft is handled from a single side.
Implementation Method 1
a nut of tapered form bedded onto the second end of the threaded rod, and a ring that can be deformed in a direction transversal to the longitudinal axis and having at least one groove, the ring being secured to the body, the groove of the ring being configured to be deformed by the tapered form of the nut during the screwing of the butterfly nut
Implementation Method 2
return means positioned between the compression nut and the bearing member and configured to be compressed between the compression nut and the bearing member by the screwing of the compression nut and to be decompressed in the second direction under the action of the compression nut
Data Source
AI summary
A device for handling a shaft forming a pivoting link between two parts, including a body configured to be inserted into the shaft, and blocked in translation with respect to the shaft along a longitudinal axis in a first direction, a compression nut screwed onto a threaded outer portion of the body along the axis in a second direction opposite the first direction, a bearing member positioned against one of the parts, and a return member configured to be compressed between the compression nut and the bearing member by the screwing of the compression nut and to be decompressed in the second direction under the action of the compression nut. This device allows the shaft of the pivoting link to be handled rapidly, and makes it possible to control the load applied onto the shaft during the handling thereof.