Replaceable Cable Gripper Insert for Wear-Resistant Load Holding
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Solution Overview
Problem
Existing 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 high-hardness gripping surface made of a different metal than the load-bearing base, secured through mechanical means such as dovetail joints or adhesives, allowing for enhanced durability and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single metal is used for the entire gripper, then the load-bearing capability is maintained, but the cable gripping surface wears down prematurely due to limited hardness
Solution Approach 1:
The gripper is divided into two distinct segments: a base made of soft, load-bearing metal and a separate insert made of hard, wear-resistant metal. This segmentation allows each part to be optimized for its specific function without compromise.
Solution Approach 2:
Different regions of the gripper are made from different materials with different properties. The base requires softness for load bearing, while the gripping surface requires hardness for wear resistance. This local quality differentiation resolves the contradiction by allowing each region to have the optimal property for its function.
2Reliability
If the cable gripping surface is made very hard, then wear resistance is improved, but the overall load capacity of the gripper is compromised
Solution Approach 1:
The gripper structure is segmented into a load-bearing base and a wear-resistant insert. The base is made of soft metal optimized for absorbing and sustaining loads, while the insert is made of hard metal optimized for cable gripping and wear resistance.
Solution Approach 2:
The gripper uses a composite construction combining two different metals with complementary properties. The soft base metal provides load capacity while the hard insert metal provides wear resistance, creating a composite structure that achieves both requirements simultaneously.
3Reliability
If the entire gripper is replaced when the gripping surface wears, then functionality is restored, but cost and time are increased unnecessarily
Solution Approach 1:
The gripper is designed as an assembly of separable components: a permanent base and a replaceable insert. When the gripping surface wears, only the insert needs to be replaced, not the entire gripper. This segmentation enables selective replacement of only the worn component.
Solution Approach 2:
The insert is designed as a consumable component that can be discarded when worn and replaced with a new one. The valuable base structure is recovered and retained for continued use, 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.