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Eyebrow head Pivot10/17/14
Anyone have any suggestions for a double acting center pivot that would work for an "eyebrow" head pair of doors?
...suspiciously raised. Post a design, this makes little to no sense.
Are you talking about the type of jig used for routing ovals?
I'm guessing that you have a pair of segment arched passage doors, and the hardware is to be a double acting pivot hinge - Bommer type or similar. The in-floor types are better.
The geometry problem is at the head as far as the door swinging and hitting the jamb. 1-3/4" door, flush to the wall in a 4-5/8" jamb will hit the jamb when swung the one way. Locate it in the center and you may be able to get it to work, depending upon the arch.
You will have to mock it up to see if it works. The mock up will be useful in explaining why it won't work, since no one ever sees this one coming until it is too late.
I have found two fixes for this when they are committed to having it swing both ways.
The top hinge not hitting the door at 90 degrees is the least of your problems.
David you are right on point. You raise an issue that I had not anticipated and thank you for the warning. My initial hurdle is what to use as a pivot at the top of the door. Is it typical to mortise the pivot bracket into the head jamb at an angle parallel with the floor and then use some type of an off the shelf rod? And then how to marry the two. For standard applications we typically use Rixson or Harmon for panel jambs. Thanks for your informed reply.
As I recall, we used the stock hardware - Bommer is most common- and it had a floor plate to cover the mechanism set below the floor. We had the painter match the plate to the flooring. The head pivot was the usual. Mortised into the head, as you say.
Once you have it mocked up and find it won't work, come back and I'll discuss the work arounds, and if they will accept them. Neither is ideal.
The situations I had were single arched head doors going from kitchen or pantry to Dining room and we came up with the work arounds. If you have a pair, you may be able to make it so one door swings one way, and the other door goes the opposite way - sort of like a commercial kitchen/dining room setup. The doors will have to be set diagonally in the width of the jamb - definitely not a standard solution.
Can't you use a bottom pivot and intermediate pivots and eliminate the top pivot, something like a Rixson 547?
Sugatsune JDA-59 hinges with a stepped jamb will work. Not a center pivot, but quality hardware. I think that a Rixon-type would need too much modification for the top pivot to work. The key to avoiding interference at the top is to either have some throw to the hinge (like a parliament hinge) or to mold or step the jamb so that there's a little relief at the top, hinge side.