Self-centering Part Extractor with Dual Spindle Linkage
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Solution Overview
Problem
Existing mechanical extractors for parts like bearings and bushings face challenges in reliable centering and efficient extraction, with limited range of motion and complexity in operation.
Innovation Solution
A self-centering part extractor design featuring a first spindle with articulated arms, a coaxial second regulating spindle, an upper handle, a freely rotating lower ring, and radial connecting rods with slots, allowing synchronized movement of arms for simplified and effective extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a first spindle with articulated arms is used, then the extractor can remove parts, but reliable centering to the part cannot be achieved
Solution Approach 1:
A second regulating spindle is introduced as an intermediary element between the first spindle and the arms. This second spindle, with its connecting rods and slots, acts as a mediator that transmits and regulates the motion from the first spindle to the arms, enabling reliable centering while maintaining the part removal capability.
Solution Approach 2:
The second regulating spindle is nested within or around the first spindle structure. The connecting rods are articulated between the second spindle and the arms, creating a nested configuration where the regulating mechanism is integrated within the overall extractor structure, allowing compact design while achieving reliable centering.
2Adaptability or versatility
If separable or interchangeable arms fixed in a sliding fork are used, then parts of various sizes can be extracted, but the device complexity increases
Solution Approach 1:
The extractor is designed with arms that can be positioned and regulated along the spindles to accommodate parts of various sizes. The connecting rods with slots allow the arms to move and adjust their position, providing universal applicability for different part dimensions without requiring multiple specialized extractors.
Solution Approach 2:
The arms are made dynamically adjustable through the connecting rods with slots, allowing them to move and reposition during operation. This dynamic configuration enables the extractor to adapt to various part sizes and shapes, providing versatility while maintaining a relatively simple overall structure compared to having multiple fixed extractors.
3Reliability
If a second regulating spindle with connecting rods and slots is added, then synchronized arm movement for self-centering is achieved, but the device complexity increases
Solution Approach 1:
The connecting rods with slots and the second regulating spindle create a self-centering mechanism that automatically aligns the extractor with the part during operation. As the arms move during extraction, the slot-guided connecting rods naturally guide the arms into proper alignment, achieving self-centering without requiring additional active control systems or complex mechanisms.
Solution Approach 2:
The second regulating spindle and connecting rods serve as an intermediary mechanism that translates the rotation of the first spindle into synchronized, regulated movement of the arms. This intermediary system provides the necessary coordination for self-centering while maintaining a manageable level of complexity through its mechanical linkage design.
4Ease of operation
If the arms are allowed to move independently with limited opening amplitude, then the extraction process becomes simpler, but the range of motion is restricted
Solution Approach 1:
The connecting rods with slots enable the arms to move dynamically with a broader range of motion. The slots allow the connecting rods to slide and pivot, providing the arms with increased opening amplitude while maintaining synchronized movement. This dynamic design preserves extraction simplicity while expanding the operational range.
Solution Approach 2:
The second regulating spindle and connecting rods act as intermediaries that coordinate arm movement to achieve both synchronized operation and increased opening amplitude. The mechanical linkage allows the arms to traverse a larger arc while maintaining coordination, resolving the contradiction between movement range and operational simplicity.
Data Source
Figure 1~2
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Figure 5~6
AI summary
The invention relates to a self-centering part extractor comprising a first spindle (1) and a second spindle (2), said spindles being coaxial to, and independent of one another. A body (3) is screwed to the first spindle (1). The body (3) is secured to the second spindle (2) which supports: a handle (6) that is screwed to the spindle, a lower ring (7) independent of the second spindle (2), and an annular support (8) which is also independent of the second spindle (2) and is secured to the upper handle (6) such that it can rotate freely relative to same. Connecting rods (9) are hinged between the annular support (8) and the legs (4), which rods are connected to the intermediate ring (7) by means of pins (13) and grooves (12).