Threaded Joint Pin Chain for Tool-Free Assembly and Maintenance
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Solution Overview
Problem
Existing chains require large forces to remove or insert pins due to their firm fitting in pin holes, necessitating special tools, making assembly or maintenance difficult without them.
Innovation Solution
A chain design featuring joint pins with an outer pin having an internal thread and an inner pin with an external thread, allowing screw fit assembly and removal without special tools, using a flange or taper surface to secure link plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pins are firmly fitted into pin holes to prevent coming out during use, then connection strength is improved, but pin removal and insertion becomes difficult requiring special tools
Solution Approach 1:
The pin is divided into two separate components: an outer pin that remains firmly fitted in the pin hole to maintain connection strength, and an inner pin with a head that can be easily inserted and removed. The inner pin includes a retainer portion that engages with the outer pin, allowing the chain to be opened or closed by simply inserting or removing the inner pin without requiring special tools.
2Reliability
If pins are firmly fitted to prevent coming out during use, then reliability is improved, but assembly and maintenance cannot be performed at preferred locations
Solution Approach 1:
By segmenting the pin into an outer pin and an inner pin with a head, the invention enables assembly and maintenance operations at any preferred location along the chain. The inner pin can be easily inserted or removed at any joint, providing location flexibility while the outer pin maintains reliable connection during operation.
3Manufacturing precision
If special tools are used for pin removal and insertion, then pin fitting precision is improved, but device complexity increases
Solution Approach 1:
The segmented pin design eliminates the need for special tools by incorporating an inner pin with a head that can be manually manipulated. The outer pin maintains precise fitting in the pin hole, while the inner pin provides easy insertion and removal capability through simple manual operations.
Solution Approach 2:
The inner pin with its head serves as a self-contained mechanism that enables easy insertion and removal without requiring external special tools. The user can directly manipulate the head of the inner pin to open or close the chain, making the system self-servicing.
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
Enables easy assembly and maintenance at any location by reducing the force required for pin removal and insertion, improving work efficiency and allowing use of standard tools.
Implementation Method 1
The inner pin includes an inserted portion having an external thread, which is inserted into the outer pin, and moreover having a head that protrudes from the outer pin
Data Source
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AI summary
To provide a chain that allows easy insertion and removal of pins without a special tool so as to facilitate assembly or maintenance in any location. The chain includes a plurality of pairs of inner link plates, a plurality of pairs of outer link plates, a plurality of pins including at least one joint pin, and a plurality of bushings, with the pins being inserted through the bushings. The joint pin includes an outer pin that is cylindrical and has an internal thread, and an inner pin that has an inserted portion with an external thread, which is inserted into the outer pin, and a head that protrudes from the outer pin. The inner pin includes a portion serving as a retainer that retains the outer link plate.