Removable Cable Gripper Insert for Wear-Resistant Jaw Surfaces
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Solution Overview
Problem
Current cable gripping mechanisms face a compromise between high load capacity and high hardness, leading to premature wear of the gripping surface and the need for frequent replacement, which is costly and time-consuming.
Innovation Solution
A cable gripper design featuring a removable and replaceable insert with a different material composition for the gripping surface, allowing for high hardness on the gripping surface and lower hardness on the load-bearing surface, along with mechanical locking mechanisms to secure the insert, enabling enhanced durability and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single metal is used for the entire gripper to ensure load-bearing capability, then the gripper can sustain high pulling forces, but the cable gripping surface wears down prematurely requiring whole gripper replacement
Solution Approach 1:
The gripper is divided into two distinct segments: a load-bearing body made of softer steel and a separate cable gripping insert made of harder material. This segmentation allows each part to be optimized for its specific function - the body for strength and the insert for wear resistance - resolving the contradiction between load-bearing capability and durability.
Solution Approach 2:
The gripper combines two different materials with complementary properties: a softer load-bearing metal for the body and a harder wear-resistant material for the cable gripping insert. This composite construction enables the gripper to simultaneously achieve high strength and extended service life by preventing premature wear of the gripping surface.
2Reliability
If the cable gripping surface is made harder to increase wear resistance, then cable gripping performance improves, but the overall gripper hardness must be compromised to maintain load capacity
Solution Approach 1:
Different parts of the gripper have different material properties optimized for their local functions. The cable gripping insert uses harder material for wear resistance where it contacts the cable, while the load-bearing body uses softer material for strength. This local differentiation resolves the contradiction between wear resistance and load-bearing capability.
3Reliability
If the entire gripper is replaced when the gripping surface wears, then functional integrity is maintained, but cost and time are increased
Solution Approach 1:
The wear-prone cable gripping insert is extracted as a separate, replaceable component from the load-bearing body. When the insert wears out, only this specific component needs to be removed and replaced, rather than replacing the entire gripper. This maintains functional integrity while significantly reducing replacement time and cost.
Solution Approach 2:
The worn cable gripping insert is discarded and replaced with a new one, while the load-bearing body is retained and reused. This selective replacement approach discards only the worn component while recovering and reusing the still-functional load-bearing structure, reducing waste and replacement costs.
Data Source
AI summary
Cable gripper jaws and cable gripper jaw members having at least one removable, cable gripping surface insert. The gripper jaw member has a recess for receiving the insert and the insert can engage with the gripper member by means of a fixative and/or a mechanical engaging means, including mechanical interlocking means. The insert and gripper member can be of different materials, including metals of differing hardness ratings. The cable gripper jaws have utility in the cable gripping fields, including in the drilling and horizontal directional drilling industries, and as part of a method for pulling cable through space, including pulling cable through space in the pipe bursting and trenchless pipe replacement industries.