Device for Braking the Rotation of a Drive Shaft of the Leaf of a High-Speed Door
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United States of America Patent
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Issued Date -
Jun 12, 2008
app pub date -
Feb 2, 2006
filing date -
Feb 2, 2005
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The invention relates to a device for braking the rotation of a drive shaft of the leaf of a high-speed door. The inventive device consists of a flange (17) which is rotated by a shaft comprising several cavities (19), each of said cavities being equipped with a wall which supports a flyweight (18) in the operating condition and which is inclined in relation to the axis of rotation of the flange by an angle of less than 90.degree.. Moreover, each cavity comprises a proximal end which is located close to the axis of rotation of the flange and a distal end which is located at a distance from said axis of rotation. According to the invention, each flyweight (18) moves in a cavity between a position whereby the shaft operates at normal speed, in which the flyweight is disposed in a zone comprising the proximal end of the cavity (19), and a position whereby the operating speed of the shaft (4) exceeds a pre-determined threshold, in which the flyweight (18) is disposed in a zone comprising the distal end of the cavity and actuates means for braking the rotation of the shaft.
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