Farmboy
MEMBER
Middlebury, VT
Since we have an ongoing morning debate about bifold hangar doors, I thought I’d throw this out to all the engineers and door experts.
On a typical bifold door, where the straps wind at the bottom edge from the carrying beam overhead, is the strap tension constant from bottom to top? Or does it vary due to the folding action and therefore the force of the upper door pulling away from its top hinges and bottom door pushing against the rollers on the building?
Assuming a wind factor of zero, is there any reason to position door when open in any particular position?
Inquiring minds...
Pb
Transmitted from my FlightPhone on fingers...
On a typical bifold door, where the straps wind at the bottom edge from the carrying beam overhead, is the strap tension constant from bottom to top? Or does it vary due to the folding action and therefore the force of the upper door pulling away from its top hinges and bottom door pushing against the rollers on the building?
Assuming a wind factor of zero, is there any reason to position door when open in any particular position?
Inquiring minds...
Pb
Transmitted from my FlightPhone on fingers...