| 摘要 |
The invention relates to a brake drive comprising at least one brake drum (1 ), said brake drum being largely prevented from turning, with at least one spreader ring (2) which is situated in the interior space thereof and which has a larger diameter before installation. After installation, the spreader ring (2) exhibits a first inherent expansion friction against turning by mea ns of the expansion force thereof exerted on all points of the friction surface s (5). Said expansion friction undergoes yet another spreading and braking intensification up to an eventual total locking when a reverse torque occurs on the drive shaft (3) via the driving pin (4) thereof and via the circular pushing force of said pin exerted on one of both faces of the spreader ring (2). The total locking contracts the spreader ring again by turning the primary handwheel (6) or primary despreading pivoted lever (6a) on the input side with the assistance of both despreading pins (6' and 6 ), said pins bei ng fixably mounted on the same, by means of a circular pulling force exerted on the opposite face of the spreader ring. The brake friction or outright blockage is lifted again and it is once again possible to adjust and to fix the entire brake drive in both directions of rotation on the input and outpu t sides at any time.
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