Threaded Cord Gripper With Hinged Arms for Grease-Slick Wire Pulling
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Solution Overview
Problem
Electricians face difficulties in pulling electrical wires and cords through tubes due to significant friction, which is exacerbated by the use of oily grease, leading to strain and potential damage to hands and equipment during repeated operations.
Innovation Solution
A one-hand manually operated gripping apparatus with hingedly connected arms, an elastic element, and a guiding route that applies a gripping force to the threading cord, either directly or indirectly through an intermediate component, providing a secure grip and reducing the effort required for pulling and pushing stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If oily grease is applied within the tube and on the threading cord to reduce friction, then the pushing-pulling operations become easier, but the gripping between the electrician's hands and the cord deteriorates, making pulling harder and causing hand skin damage
Solution Approach 1:
The patent introduces a gripping apparatus as an intermediary device between the electrician's hands and the threading cord. This apparatus includes gripping elements that contact the cord while being isolated from the direct harmful effect of oily grease, allowing the electrician to maintain firm grip without direct skin contact with the grease-contaminated cord surface
2Productivity
If significant force is applied to overcome the tube's friction on the cord and wires, then the pulling operation succeeds, but the threading cord and electrician's hands suffer damage
Solution Approach 1:
The gripping apparatus serves as a mediator that distributes and manages the significant pulling forces. The apparatus's structural components are designed to withstand these forces without damage to the cord or the electrician's hands, transferring the mechanical stress through durable apparatus components rather than directly to the cord surface or skin
Solution Approach 2:
The patent changes the physical parameters of the gripping interface by using specifically designed gripping elements with appropriate friction characteristics, surface area, and material properties. This allows for effective force transmission while protecting both the cord and the electrician's hands from damage
3Productivity
If repeated pulling operations are performed to install multiple wires, then the electrical installation progresses, but the electrician's hands and the threading cord become damaged
Solution Approach 1:
The gripping apparatus is designed to be self-regenerating in its gripping capability. After each pulling operation, the apparatus can be reset or repositioned without degradation of its gripping function, allowing repeated operations to be performed with consistent performance and without cumulative damage to the cord or the electrician's hands
Solution Approach 2:
By introducing the gripping apparatus as a reusable intermediary tool, the patent protects the cord and hands from repeated direct contact with high-friction surfaces. The apparatus absorbs the wear and tear from repeated operations, maintaining the integrity of the cord and the electrician's hands over multiple installation cycles
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 apparatus significantly reduces the effort needed for pulling and pushing electrical wires and cords through tubes, minimizing hand strain and equipment damage, while allowing for efficient operation with different cord diameters and enabling wire cutting functionality.
Implementation Method 1
an elastic element maintaining the apparatus in a non-operative state
Implementation Method 2
lower and upper arms that are hingedly connected by a first hinge
Implementation Method 3
applies a gripping force on said section of the threading cord
Data Source
AI summary
An apparatus configured to grasp, including a lower and upper arms that are hingedly connected by a first hinge, an elastic element maintaining the apparatus in a non-operative state, a guiding route located below or above at least one of the arms, configured to receive a section of a threading aspect, wherein during an operative state, a simultaneous press of the two arms, one towards the other, applies a grasping force.