Cable Tray Hold-Down Clamp With Clamping Teeth
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Solution Overview
Problem
Current cable tray hold-down clamps provide low pull retention and are weak, causing cable trays to slide under significant force and bend during installation due to reliance on friction and inadequate structural support.
Innovation Solution
A hold-down clamp design featuring a main body with clamp engagement and expansion guide portions, opposed side walls, and clamping teeth that deform the cable tray's flange to create a mechanical key, preventing sliding and rotation, while allowing thermal expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current hold-down clamps press the cable tray flange against the support member using friction force, then the clamp structure is simple, but the pull retention is low and the cable tray slides under significant force
Solution Approach 1:
The clamp is divided into multiple functional segments: a body portion that engages the support member, side members with flanges that engage the cable tray flange, and clamping teeth that bite into the flange. This segmentation allows each part to perform its specific function optimally, creating reliable mechanical retention rather than relying on simple friction.
Solution Approach 2:
The invention transitions from a single-plane friction-based retention to a multi-dimensional mechanical engagement system. The clamping teeth extend downward to engage the flange in a vertical dimension, while the flanges extend laterally to engage the cable tray sides, creating retention in multiple spatial dimensions simultaneously.
2Strength
If current hold-down clamps use a simple pressing mechanism, then the device complexity is low, but the clamp bends when high torque is applied during installation
Solution Approach 1:
Multiple structural elements are merged into a single integrated clamp assembly: the body portion, side members, flanges, and clamping teeth are all connected as one rigid structure. This merging distributes the applied torque across multiple load-bearing components rather than concentrating stress on a single pressing mechanism, preventing bending during installation.
Solution Approach 2:
The clamping teeth are pre-positioned to engage the cable tray flange before full tightening torque is applied. This preliminary engagement creates a mechanical key that prevents slippage and distributes the installation torque across the entire clamp structure, preventing bending during the tightening process.
3Reliability
If the clamp uses clamping teeth to deform the flange and create a mechanical key, then the pull retention is high, but the manufacturing complexity increases
Solution Approach 1:
The clamping teeth are designed with specific geometric parameters (angle, depth, width) that allow them to deform the flange material plastically and create a mechanical key. By optimizing these parameters, the teeth can be formed using standard metal forming processes, maintaining ease of manufacture while achieving reliable anti-sliding retention.
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 clamp securely retains cable trays on strut channels, preventing sliding and rotation, and withstands high torque during installation, enhancing pull retention and structural integrity.
Implementation Method 1
clamping teeth that deform the cable tray's flange to create a mechanical key
Implementation Method 2
allowing thermal expansion and contraction
Data Source
AI summary
A hold-down clamp for holding a cable tray on a strut channel includes a main body member extending between first and second ends, opposed side walls extending downwardly and perpendicularly from the main body member, and first and second side members extending from each of the opposed side walls. The main body member has a first end defining a clamp engagement portion and a second end defining an expansion guide portion. Each of the first and second side members includes a flange having a clamp engagement structure, a planar middle structure, and an expansion guide structure that are integrally connected to each other, and a clamping tooth, which is defined between the clamp engagement structure of the flange and the side wall such that the clamping tooth transitions into the clamp engagement structure of the flange and the side wall of the hold-down clamp.