Hormann is a German garage door manufacturer that has set up a manufacturing plant here in the United States. The purpose of this entry is to show many of the unique features of the door parts.
The bottom fixtures incorporate spring loaded arms to prevent the cables from coming off the drums if the cable tension loosens.
This fixture is normally covered for safety.
The end hinges are graduated and uniquely designed, but their function for supporting rollers is similar to the function of American end hinges. Notice the standard 2″ roller with the 7/16″ stem.
The center hinges are similar to many of the American-made hinges. Here we see the number 3045112.
The adjustable top fixtures look similar to those made by Napoleon and Arrow Tru-line.
The torsion assembly functions the same as American-made systems, but there are serious compatibility issues to consider when replacing parts.
One is that the torsion springs use German Spring Sizes. None of the American measuring or engineering charts work with these wire sizes. Springing the door will require weighing the door.
Another complicating feature is that the cable drums on residential doors are not the standard four inch. They’re considerably larger. Notice also that the end of the cable is secured with a set screw. When spring the door it will be necessary to replace the drums and cables, or to get engineering information from Richard Kinch’s site.
The springs appear to have two inch inside diameters, but the ends are hooked like the old BarCol door springs.
Here you can see the end hooked over a pin on the winding cone.
The other end of the spring hooks over a pin on the stationary cone.
The spring anchor bracket holes do not have the standard 3 3/8″ center line spacing, so a conversion from the German hardware will require replacing this part as well.
One nice feature of the Hormann spring assembly is that the shaft has a one inch outside diameter and the bearings have inside diameters of just slightly over an inch so these parts can be reused if converting to standard torsion hardware. This also applies to the end bearing plates, pictured below. These plates also are larger to support the junction for the vertical and horizontal tracks.
Notice also that the doors use standard 2″ tracks, but rather than the curve being only on the horizontal track, half the curve is on the top of the vertical track and half is on the jamb end of the horizontal track.