| 摘要 |
1324956 Vehicle dead man's handle RHEINSTAHL AG 20 May 1971 [11 Aug 1970] 16035/71 Heading B7H [Also in Division F1] A dead-man's handle arrangement for a rail vehicle comprises compressed air operated fluidic elements wherein, upon inattentiveness of the driver, an audible signal is operated ignorance of which results, after a predetermined interval, in automatic braking. Pneumatic switch 2, which has to be closed at regular intervals to confirm vigilance, causes, in the ON position, air from 1 to be switched from output 58 to 5 of OR/NOR gate 4 whence it flows to control input 8 of flip-flop 9 to switch air from output 10 to 11. Thus pressure in fluid resistor 14 rises as that in 15 decays and a short pressure pulse occurs at the control input of AND gate 13 whose output 18 is fed to control input 19 of a binary counting cascade 64 which counts pulses produced by an astable multivibrator 63. As shown, a delay of 16 pulses of the multivibrator 63 elapses between a signal arising at output 18 of gate 13 and a signal arising at output 21 of counter 26 which switches the output of AND gate 60 to 62. This causes a signal to arise at control input 42 of OR/NOR gate 40 switching its output from 43 to 44. The disappearance of air pressure from 43 causes the output of OR/NOR element 45 to be switched from 48 to 49 thus sounding the horn 50. If the driver does not operate switch 2 again, after a further eight pulses from multivibrator 63, the output of counter 25 switches 22 to 21 producing a control input at 54 of AND gate 51 which, with the already existing control input at 54 produces a switching from output 52 to 53 which output is amplified at 57 to operate the air brakes of the vehicle. |
