Anodize:
An electrolytic method of coating aluminum with a protective ordecorative film, which is generally clear in color.
Astragal:
Weather-stripping added to bottom section of the door to seal the opening along the floor.
Back Hangs:
The vertical supports for the horizontal track, cross-braced to prevent lateral movement and track spread.
Backroom:
The required clearance from the face of the header to any obstruction to the rear of the horizontal track.
Bottom Bracket:
A structural support located on the bottom section of the door which provides for attachment of the lifting cables on the sectional doors. Also referred to as Bottom Corner Bracket. (Note: Track rollers may have a separate door attachment in some door designs.)
Bracket Mounted Track:
A method of fastening vertical track to a doorjamb using angle brackets. Also referred to as Mounted or Track Bracket.
Cable Drums:
Grooved drums on the torsion spring shaft that lifting cables wind around when door is opened. Designed to allow cable to be accumulated or dispensed in an orderly manner and to prevent lapping or cable chafing.
Cable Safety Device:
A safety bottom fixture specifically designed to prevent a door from falling in the event of cable breakage.
Cable Sleeve:
A manufactured device used to form a loop of cable, size of which is determined by the cable diameter.
Cable Stop:
A swaged fitting at the end of the cable to prevent slippage through a slot in a drum.
Cables:
Multi-strand wire used to attach the door, via bottom brackets, to the counterbalance mechanism.
Center Bearing Plate:
Bearing and mounting plate installed at approximately half the door width above the door which acts as a support for the spring shaft. Can be mounted in various locations, not necessarily in center, depending on size of springs.
Center Hinge:
Flat hinge located on all intermediate stiles to allow for door section to turn the track radius as the door opens.
Center Lift Cable:
Additional cable assembly, which is secured to the outside of the door at points toward the center of the door. Used to provide extra lifting support for extremely wide or heavy doors. (Commercial door application)
Center Post:
A slender dividing bar between two doors. Usually designed to carry horizontal (wind) load but not vertical load. (Commercial door application)
Center Support Bearing:
Bearing and mounting plate installed at approximately half the door width above the door which acts as a support for the spring shaft. Can be mounted in various locations, not necessarily in center, depending on size of springs.
Chain Hoist:
Adds mechanical advantage to manually operated doors. Couples to one end of the solid torsion shaft. (Commercial door application)
Clearances:
The amount of side-room, headroom, and backroom required to properly install a sectional door.
Coupling:
Adjustable cast iron connector in two halves for torsion solid shafts on wide doors. Eases installation and allows adjustment in cable lengths so doors will operate smoothly without cocking.
Curtain:
The part of the sheet door that actually rolls up and down or slides side to side. Manufactured of corrugated sheets seamed together.
Cycle:
One complete cycle of a door begins with the door in the closed position. The door is then moved to the open position and back to the closed position again. Note: Torsion spring operated doors with higher-than-normal cycle life requirements may be specified with 25,000, 50,000, or 100,000 cycle springs.