Abstract: A length of section for framing the leaf of a gate or door or other structure that closes off a building and with a panel, preferably a wooden panel, especially for swinging doors with a sectional strut made out of a strip of sheet metal that is shaped in such a way that its two longitudinal borders are joined parallel into a web designed as a mount for the panel and having perforations for the screws that secure the panel extending through both longitudinal borders. To make sure that the screws will fit through all the perforations once the strip has been shaped into a length of section, the perforations in one longitudinal border are larger than the perforations in the other longitudinal border and in the cross-section of each smaller perforation in the web on the sectional strut is in the vicinity of the correspondingly positioned larger perforation.

Abstract: A sectional strip 5 with an outward-facing outside 10 and an inside 11 for roll-up, fold-up, and similar gates exhibits at its top 6 and bottom 7 a point of articulation 8 that extends over the total width of the gate for pivoting the adjacent upper and lower, identically shaped sectional strip in relation to the plane of the gate, which consists of the sectional strips that are not rolled up, when rolled up onto the armor of rolled-up sectional strips. The point 8 of articulation at top 6 is in the form of at least one perpendicular cylindrical sector 12 with an outward-facing surface 13 and the point 8 of articulation at bottom 7 is in the form of at least one cylindrical sector 14 with an inward-facing surface 15. The surface at top 6 and the surface at bottom 7 have radii 16 and 17 of curvature that are practically equal in length.

Abstract: Apparatus is provided for supporting and drivingly opening and closing an overhead single-panel door such as a garage door. The apparatus includes drive rollers protruding from the plane of the door at respective opposite upper corners thereof, which drive rollers are bearingly supported by a plate member attached to the door. These drive rollers are supported from underneath and in driving contact with fixed guide tracks arranged at the building accommodating the door. In order to insure continuous firm driving engagement of the drive rollers with the topside of the guide track, a bearing bracket is rotatably supported at the drive roller axles, which bearing bracket in turn supports a pair of counterpressure rollers engageable directly at the underside of the guide track.