Meter Box Ground Clamp Geometry to Resist Tightening Torque
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Solution Overview
Problem
Conventional meter box clamps lack flexibility in mounting, often rotate or detach due to high torque, and struggle with painted surfaces, leading to poor ground connections.
Innovation Solution
A meter box ground clamp with an L-shaped body, a clamp screw, and a ground engagement screw, featuring angled threading and gripping claws to secure to the meter box, and a tip portion to cut through paint for improved grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single hooking feature is used to engage the meter box, then the clamp assembly structure is simple, but the clamp lacks flexibility to adapt to various mounting surfaces
Solution Approach 1:
The clamp body is divided into multiple arm portions (first arm portion, second arm portion, third arm portion) with separate hooking features. Each arm portion can independently engage with different surfaces of the meter box, providing adaptability to various mounting configurations while maintaining a relatively simple overall structure.
2Reliability
If high torque (150 in-lbs) is applied to tighten the ground clamp screw, then the ground connection is secure, but the clamp rotates and walks off or jumps off the meter box
Solution Approach 1:
Different arm portions are designed with different engagement characteristics. The first arm portion engages with one surface while the second and third arm portions engage with adjacent surfaces. This distribution of engagement points locally stabilizes the clamp against rotational forces during tightening, preventing the clamp from walking off while maintaining secure ground connection.
Solution Approach 2:
The clamp transitions from a single-point engagement to multi-point engagement across different dimensions of the meter box surface. By engaging multiple arm portions with adjacent surfaces, the clamp creates a stable triangular or multi-faceted engagement geometry that resists rotational torque during tightening.
3Reliability
If the meter box surface is painted or coated, then the aesthetic appearance is improved, but the clamping bolt cannot obtain a strong ground connection
Solution Approach 1:
The clamp is designed to engage with the meter box surface before final tightening. The multiple arm portions initially contact the surface to establish engagement points, allowing the fluted portion of the screw to effectively cut through paint during the tightening process. This preliminary engagement ensures that the grounding connection is established on bare metal rather than painted surface.
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 attaches to various surfaces, prevents detachment during tightening, and enhances grounding by exposing bare metal for better electrical connection.
Implementation Method 1
The threaded portion of the clamp screw may include a fluted portion at the free end that is configured to cut into the second surface of the meter box to strip paint from the second surface
Implementation Method 2
The clamp screw may include a tip portion that extends from a radial center of the threaded portion at the free end and is configured to extend beyond the free end of the threaded portion such that the tip portion is configured to engage the second surface of the meter box before the threaded portion when the clamp body is being clamped to the meter box
Implementation Method 3
The first threaded opening may be configured to receive the clamp screw at a first angle less than 90 degrees relative to a plane of the first arm portion such that a free end of the clamp screw forms a second angle greater than zero degrees relative to the second surface of the meter box, and the second angle may be configured to create a force that urges the second arm of the clamp body toward the meter box in response to a tightening torque
Implementation Method 4
The clamp body may include a gripping claw configured to extend from the second arm portion and curve toward the first arm portion, the gripping claw may be configured to engage a first surface of an electrical meter box
Data Source
AI summary
A meter box ground clamp may include a body portion having a first portion, a second portion, and a gripping portion, and a fastener member configured to couple the body portion to an electrical meter box. The fastener member may be configured to extend through the first portion to engage a first surface of the meter box and move the first portion away from the first surface and move the gripping portion into engagement with a second surface of the meter box that faces away from the first surface. The receiving portion may be configured to receive the fastener member so as to create a force that urges the second portion of the body portion toward the meter box in response to a tightening torque applied to the fastener member so as to prevent the body portion from moving off the meter box in response to the tightening torque.