Pendulum Ratchet Wire Grip With Automatic Direction Switching
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Solution Overview
Problem
Conventional wire grips for indirect live wire work require separate rotational direction switching operations, making them inconvenient and unsafe for workers, especially when performing tasks like adjusting wire dips and replacing suspension insulators, as they necessitate close proximity to the wire and increase the risk of electric shock.
Innovation Solution
An automatic direction switching pendulum-type rotary drive ratchet wire grip that uses a rotary lever and automatic reversing pawl mechanism to adjust the drum shaft's rotation direction without a separate direction switching operation, allowing for safe and efficient winding or unwinding of the belt from a distance, and includes a backstop ratchet ring to prevent reverse rotation and backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional ratchet wheel type wire grip is used for indirect live wire work, then the wire belt can be wound around the drum, but the device requires separate rotational direction switching operations which increases operational complexity and safety risks
Solution Approach 1:
The patent combines the direction switching function with the main operating handle by providing notches at different angular positions on the handle that engage with corresponding cam lobes. This integration eliminates the need for a separate direction switching mechanism, allowing workers to change rotation direction simply by rotating the handle to different angular positions while maintaining operational simplicity.
Solution Approach 2:
The patent employs a cam mechanism with lobes positioned at different angles that dynamically changes the engagement points based on the handle's rotational position. As the handle rotates to different angular positions, different cam lobes engage with the notches, automatically switching the direction of the ratchet wheel and drum rotation without requiring additional control mechanisms.
2Reliability
If a conventional wire grip requires close proximity to the wire for direction switching operations, then rotational control can be achieved, but the risk of electric shock increases
Solution Approach 1:
The patent makes the operating handle self-serving by incorporating angular notches that automatically engage with cam lobes at different positions. The mechanism itself provides the direction switching capability through its geometric design, eliminating the need for the worker to perform separate direction switching operations close to the live wire. The worker simply rotates the handle to the desired angular position, and the mechanism automatically controls the rotation direction.
3Stability of the object's composition
If a ratchet mechanism is used to prevent reverse rotation, then unidirectional control is achieved, but backlash and reverse rotation may still occur without additional prevention mechanisms
Solution Approach 1:
The patent employs an asymmetric ratchet tooth design where the teeth are inclined at specific angles to allow rotation in one direction while preventing reverse rotation. The asymmetric geometry creates a mechanical advantage that permits smooth rotation in the intended direction while creating a locking effect in the opposite direction, effectively preventing backlash and unintended reverse rotation.
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 stable and efficient performance of indirect live wiring tasks, such as adjusting wire dips, installing wires on poles, and replacing suspension insulators, while maintaining a safe distance from the wire and preventing reverse rotation and backlash, thus enhancing operational safety and durability.
Implementation Method 1
a cam (220) provided at a tip portion of the rotary operating shaft (210) and disposed at a location eccentric from a central portion of the tip portion
Implementation Method 2
a ratchet wheel (12) disposed on one side of the wire winding member (20) and coaxially connected to the drum (11) so as to rotate the drum (11) in only one direction
Implementation Method 3
a pendulum (600) coupled to a rear side of the drum shaft operating plate (500) and formed to protrude toward one side
Data Source
AI summary
The present invention relates to a wire grip for indirect live wire and a method for wiring indirect live wire and, more specifically, to an automatic direction switching pendulum-type rotary drive ratchet wire grip for indirect live wire and a method for wiring indirect live wire using same, wherein automatic forward or reverse rotation of the drum shaft can be operated by simply operating a rotary lever using a stick for indirect live wire without separate rotational direction switching operation, accordingly, indirect live wire work from a distance from the wire in the live wire condition enables stable wiring work such as wire reversal adjustment work, long wire installation work, and suspension insulator replacement work, and a drum shaft is driven by a backstop ratchet ring operated by a multi-angle bundle pearl to prevent a backlash phenomenon during a strong anti-reverse driving process and a contrary reverse rotation driving process.