Safety Spring Containment
An extra cable used with extension springs to prevent pieces of the spring from causing damage or injury in the event the spring breaks. The cable is threaded through the center of the spring and is secured on both ends of the horizontal track.
Sectional Joint Meeting Rail Seal
A weather-strip integral with the section at the joints between door sections.
Sectional Type Doors
Doors made of two or more horizontal sections hinged together to provide a door large enough to close the entire opening. Sectional doors are guided into the horizontal or open position by a system of vertical or horizontal tracks. May be fabricated of continuous roll-formed steel with reinforcing ribs, flush sections of steel or aluminum.
Type of bearing that adequately supports the radial forces dictated by the weight of the counterbalance assembly and door weight, and the lateral forces exerted. See Center Support Bearing.
Shafts, Tubular and Solid
A tubular or solid steel counterbalance shaft transmits lifting force of the torsion springs to the cable drums and lifting cables.
A pulley with integral ball bearings designed to handle a cable and used to control the movements of the cables employed in the door counterbalance system. Various types are stud or clevis.
The configuration of the meeting rails. When closed, the shiplap prevents rain, wind, and light from infiltrating the door between the door sections. See Tongue-and-Groove.
A horizontal measurement from each side of the door opening outward along the wall to the nearest obstruction within the building.
Spring Anchor Plates
Designed to transmit torque from the stationary end of a torsion spring to the building structure and, at the same time, support the weight of the torsion shaft in a level attitude. The anchor plate is able to withstand the lateral forces exerted by a torsion spring. Usually supplied by the general contractor. See Center Support Bearing.
Hardware used to make up the door counterbalance assembly. Spring Bumper Small spring-cushioning bumper attached to the horizontal track, which stops the door at the full open position. (Commercial door application)
The sleeves or cones, which are used to affix the torsion springs to the torsion shaft. One piece is a stationary sleeve or spring retainer, and the second piece is an adjusting cone or winding sleeve.
Steel Jamb Mounting
Continuous angle attached to vertical track and fastened to the jamb by welding, self-tappers, or bolts. (Commercial door application)
Door framing made from either channel or angle iron.
Serves to seal the perimeter of the door against weather and light infiltration. Stop molding is nailed to the jamb, outside the door, and is incorporated as one of the final steps in the installation process. Sometimes called doorstop, it is usually wooden or plastic. Stops Bars or brackets mounted at top of guides to prevent bottom bar from traveling out of the guides when the sheet door curtain is fully raised. (Commercial door application)
Straight Incline Track
Vertical track assembly that extends from floor to twice the height of the opening without break-away feature. See Break-Away Track. (Commercial door application)
L-shaped metal reinforcement members attached horizontally to the inside of the door section to add strength and rigidity. Struts are necessary on wide heavy doors to help prevent sagging and bowing and to provide additional reinforcement to comply with the required windloading. Also called trusses.
See Removable Post.