Electrical Box Hanger with 45-Degree Mounting for Knockout Access
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Solution Overview
Problem
Hangers for grid ceilings often interfere with access to knockout apertures on electrical boxes, limiting the connection of electrical conduit or cables due to their anchoring structures, and are not easily installable or cost-effective.
Innovation Solution
A hanger assembly featuring an elongated U-shaped bar with end and center brackets, allowing the electrical box to be mounted with its sides either square or at a 45° angle to the bar, providing full access to knockout apertures and using a center bracket with strategically positioned threaded bores for secure mounting, along with an anchor bar for overhead support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional hangers with anchoring structures are used, then the electrical box can be supported from above, but the anchoring structure interferes with access to knockout apertures on the electrical box
Solution Approach 1:
The hanger assembly is divided into separate functional components: an elongated bar that provides support without interference, end brackets for attachment to T-rails, and an anchor bar for overhead support. This segmentation allows each component to perform its function independently without interfering with knockout access.
Solution Approach 2:
The anchoring function is extracted from the main support structure. Instead of having the support structure itself interfere with knockouts, the anchoring is performed by a separate anchor bar that attaches to the elongated bar, leaving the electrical box area clear for conduit connections.
2Adaptability or versatility
If limited knockout access is accepted, then the anchoring structure can be simpler, but the amount of electrical conduit or cable that can be connected is limited
Solution Approach 1:
The elongated bar design provides universal support that works with electrical boxes of various sizes and configurations. The 45-degree mounting option enables full access to all four sides of the electrical box, making the hanger adaptable to different conduit routing requirements and enhancing versatility.
3Ease of operation
If complex hanger assemblies are used to achieve full knockout access, then all knockouts can be accessed, but manufacturing and installation costs increase
Solution Approach 1:
The hanger assembly uses inexpensive stamped sheet metal components rather than expensive fabricated metal parts. The elongated bar, end brackets, and anchor bar are all made from simple stamped pieces that can be mass-produced at low cost, making the solution economically viable.
Solution Approach 2:
The design changes the mounting angle parameter to 45 degrees, which optimizes access to all knockout apertures while maintaining a simple structure. This parameter change enables full conduit connection capacity without requiring complex mechanical adjustments or additional components.
4Productivity
If rapid installation is desired, then simple assembly over T-rails is needed, but secure load-bearing support must be ensured
Solution Approach 1:
The end brackets are pre-formed with arms and inner legs designed to snap over and rest on T-rail ledges in a single installation motion. This preliminary design of the bracket geometry allows installers to quickly secure the hanger assembly without complex fastening procedures, while the integrated anchor bar ensures load-bearing strength.
Data Source
AI summary
A hanger assembly for supporting an electrical box above a drop ceiling having a grid supporting structure. The assembly includes an elongated one-piece bar with a U-shaped cross-section, an end bracket secured at each end of the bar, a center bracket, an anchor bar, and an electrical box. The end brackets include an inner leg for resting on the horizontal ledges of adjacent T-rails and arms for loosely fitting over the top of the T-rails. A fastening arrangement for securing the electrical box to the elongated bar enables mounting the electrical box in two ways. The electrical box can be mounted with its sides square with the bar or with the sides at a 45° angle to the bar. Mounting the electrical box with the sides at a 45° angle provides full access to all knockout apertures in the sidewalls of the electrical box.