| 摘要 |
In a master brake cylinder (5), whose cylinder chamber (5a) is connected through a pressure chamber (2) and lines (1) with the brake cylinders (not shown) at the individual wheels, a valve slide (3) is inserted between the cylinder chamber (5a) and the pressure chamber (2). The valve slide (3) can be moved between the shown free position in which there is free passage in both directions through a through-opening (3c), and a locked position (not shown) where passage in the direction from the pressure chamber (2) to the cylinder chamber (5a) is blocked by a non-return valve (3a), which thus just permits actuation, but not deactuation of the brakes. Attempts at driving with the valve slide (3) in the locked position (not shown) will therefore cause the brakes to be blocked in the first given brake situation, and further driving is prevented. The valve slide (3) can be moved by suitable remote control means - in the shown example electromagnets (6 and 7) with associated control lines (6a and 7a) - between the said two positions in which the slide is held stably by e.g. a locking ball (10) which engages with one of two locking notches (10a, 10b). |
