Bridging Beneath Roll-up Garage Doors

This contraption consists of two thin-wall square tubes, each as long as the distance between the garage door tracks and seperated by something like 6ft. They are placed such that the T-handled manual door-raising rope just fits between them whether the door is up or down (so that the handle won't interfere with the door's movement when I use the automatic opener). Welded to the ends of these tubes are 3in. wide steel straps that I bent into angle end connectors. These are fastened to the tracks with 3: #10-32 BHMS on each end. I selected Button Head screws because they have a low enough profile to clear for the door rollers as they pass by.

Between the two cross-wise tubes I've placed a length-wise member with an attached short vertical tube which hangs downwards. This provides a convenient place to store an air hose where it's most needed, next to my mill.

Photo #1: One end of one cross-wise tube as it is installed. Note that it hangs down a bit from the track; this provides a little clearance for any obstructions like the T-handled manual door-lifting rope.
Photo #2: Tube end detail. Note holes in the bottom of the angular piece. These provide extra areas to weld each one in place. The tops of the button head screws can be seen in the track. I used stainless fasteners for no particular reason.
Photo #3: View from the back of the shop. This was taken before I added the fore-and-aft tube with the vertical drop for the air hose, but in my haste to make use of it I've already zip-tied an extension cord to it.
Photo #4: Here's the unpainted vertical bit (hanging down from the fore-and-aft tube) with the air hose attached. The fore-and-aft tube to which it's welded only sits atop the two cross-wise tubes. It has runners about 2ft long welded to each end and I tacked hanging side-tabs onto these so that the whole assembly can be traversed from one side to the other without tumbling down on my head. The length of the runners keeps it from wobbling back and forth when I reach for the air hose.

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