Helical Wire Thread Protector Mounting Spindle Friction
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Solution Overview
Problem
Conventional thread-protecting elements require elaborate and costly special tools for mounting, with notches weakening the wire and pin breakage necessary for removal, complicating the process and increasing production costs.
Innovation Solution
A method using a simple mounting spindle with a thread adapted to the helical wire, employing frictional engagement via a reduced diameter end section for easy mounting and removal, eliminating the need for complex tools and pin breakage, and allowing for cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a notch for pulling is provided in the helical wire, then the wire can be pulled and rotated into the receiving thread using a special tool, but the cross section of the wire is modified which makes the winding process more difficult
Solution Approach 1:
The helical wire is segmented into two distinct parts: a head portion with reduced diameter that remains outside the receiving thread, and a body portion that is threaded into the receiving thread. This segmentation allows the head to serve as an external manipulation point for mounting and removal operations without requiring modifications to the wire's cross-section during winding.
Solution Approach 2:
A mounting tool is introduced as an intermediary device that engages with the head portion of the helical wire. This mounting tool serves as a mediator that transfers rotational motion and pulling force to the wire during installation, and later serves as a lever for removal, eliminating the need for notches or pins in the wire itself.
2Ease of operation
If a pin for pulling is provided on the helical wire, then the wire can be pulled and rotated into the receiving thread, but the pin must be broken and removed after assembly which complicates the process
Solution Approach 1:
The pulling and manipulation function is extracted from the helical wire itself and relocated to a separate mounting tool that engages with the head portion. This extraction eliminates the need for pins that would need to be broken and removed, simplifying the overall assembly process while maintaining ease of operation.
Solution Approach 2:
The head portion of the helical wire is designed to self-eng age with the mounting tool through frictional forces. The reduced diameter of the head creates a frictional engagement that is sufficient to transmit mounting torques, allowing the wire to serve itself during installation without requiring additional fastening elements.
3Ease of operation
If elaborate and costly special tools are used for mounting the helical wire, then the wire can be installed into the receiving thread, but the production costs increase
Solution Approach 1:
The diameter parameter of the helical wire is changed at the head portion to create a reduced diameter section. This parameter change enables frictional engagement with the mounting tool and allows for simple tool design, thereby reducing production costs while maintaining ease of operation.
4Ease of operation
If the helical wire is provided with a reduced diameter end section, then frictional engagement with the mounting spindle is created enabling easy mounting and removal, but the wire structure is modified
Solution Approach 1:
The helical wire is designed with local quality variation: the head portion has a reduced diameter while the body portion maintains the original diameter. This local modification concentrates the geometric change only where needed for mounting tool engagement, while the functional threading portion remains unchanged for optimal performance.
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 straightforward, cost-effective mounting and removal of thread-protecting elements with reduced production complexity and no pin breakage, enhancing efficiency in thread repair and series production.
Implementation Method 1
The helical wire has at least one end section whose internal diameter is reduced so far in comparison to the remaining section of the helical wire that it is smaller than the diameter of the mounting spindle. Through this, a type of wrap spring effect results, which enables a trouble-free mounting of the helical wire, and a trouble-free removal of the mounting spindle.
Data Source
AI summary
A mounting spindle with a thread that is formed adapted to the thread-protecting element, formed as a helical wire, serves as a mounting tool with the mounting method. The helical wire is fixed on the mounting spindle by frictional engagement, which is greater than the torque necessary for mounting the helical wire into the receiving threads. The mounting spindle with the helical wire fixed thereon is then threaded into the receiving threads. Then, the mounting spindle is removed from the helical wire by rotation opposite to the mounting direction. The frictional force is achieved by a reduced-diameter end section of the helical wire.