| 摘要 |
PCT No. PCT/SE91/00812 Sec. 371 Date Sep. 15, 1993 Sec. 102(e) Date Sep. 15, 1993 PCT Filed Nov. 28, 1991 PCT Pub. No. WO92/09822 PCT Pub. Date Jun. 11, 1992.Wear warning device for indicating wear in brake lining and drum in drum brakes for motor vehicles with automatic brake adjustment. In a drum brake with a lifter and adjustment devices (5), comprising an internally threaded lifter head (7) and a lifter screw (8) screwed therein, the wear warning device comprises a switch (20) supported by the lifter head, the switch having an axially displaceable pin (22) in contact with the thread of the screw (8). the screw is provided at its distal end with a depression (26) in the thread. When the pin moves down into the depression, the circuit in the switch is closed in order to activate a warning device. |
