Winding Device Movable Contact Overheating Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing winding devices for electric wires lack effective safety measures to prevent overheating and associated fires, often requiring complete unwinding before use, which is unreliable and inconvenient, and existing solutions focus on corrective measures rather than prevention.
Innovation Solution
A winding device with a movable contact system that rotates between connected and disconnected positions via an offset axis, utilizing a pivoting body with off-center connection points and elastic locking means to ensure secure electrical disconnection, preventing overheating by automatically disconnecting when excessive tension is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If complete unwinding of the electric wire is required before use, then safety against overheating is improved, but reliability is worsened because this solution is relatively easy to bypass
Solution Approach 1:
The patent implements preliminary action by automatically disconnecting the electrical connection before excessive heating occurs. The switch means are positioned to open the electrical circuit as soon as the drum begins to rotate during unwinding, preventing the need for complete unwinding before use while maintaining reliable overheating protection that cannot be easily bypassed
2Object-affected harmful factors
If switch means are added to disconnect the winding device from the electric line, then safety against overheating is improved, but device complexity is worsened
Solution Approach 1:
The patent merges the switch means with the drum structure itself. The switch means are integrated into the drum assembly, with the movable contact mounted on the drum and the fixed contact positioned to engage with it. This integration allows the switching function to be achieved without adding separate complex control systems, maintaining simplicity while providing reliable overheating protection
3Extent of automation
If the movable contact is mounted on the drum with offset axis, then automatic disconnection during unwinding is improved, but manufacturing precision is worsened due to offset axis requirements
Solution Approach 1:
The patent deliberately employs asymmetry by mounting the movable contact on the drum with an offset axis rather than a centered axis. This asymmetric positioning, combined with the specific angular arrangement of the contact zones, enables the automatic disconnection function during drum rotation. The design accepts the manufacturing precision requirements of offset axes as a necessary trade-off to achieve reliable automatic disconnection and overheating protection
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 provides secure and automatic disconnection of the electrical connection, preventing overheating and potential fires, ensuring user safety and continuous service by integrating reliable safety features into the winding mechanism.
Implementation Method 1
the locking means comprises an elastic means developing a thrust force to press said lug against a boss zone
Implementation Method 2
A traction exerted on said wire at the end of unwinding creating a torque on the body and causing the rotation of the movable contact from the disconnected operating position to the connected operating position
Data Source
Figure 1
Figure 2~4
Figure 5~7
AI summary
The device has a drum (1) mounted rotatably around a rotational axis (Z1) of a frame (5). Switches cut electric connection between an end of an electric wire and a connection block (8), and have a fixed contact (20) secured to the frame and the block. The switches have a movable contact (10) mounted rotatably around a rotational axis (Z2) of the drum and connected to other end of the wire. The movable contact is rotatably movable between disconnected and connected operating positions, in which the movable contact is disconnected from and connected to the fixed contact, by traction on the wire.