Combined supporting roller-friction drive arrangement for overhead single-panel doors

US4120072A · kind A · utility

Assignee

• Hormann KG Amshausen · DE

Inventor

• Michael Hormann · Bodenwerder, DE

Key dates

• Filing date: Aug 23, 1977
• Grant date: Oct 17, 1978
• Expiry date: Aug 23, 1997

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E05Y2900/106
• WIPO field: Civil engineering
• WIPO sector: Other fields

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. The counterpressure rollers are spaced from one another in the direction of travel of the guide roller at respective opposite sides of a line through the axle with the drive roller and extending downwardly, such that at least one of these counterpressure rollers is continuously in supporting backing engagement with the guide track so as to assist in assuring a firm driving contact between the guide rollers and t…