. The Street railway journal . ong them Stuttgart, Strassburg andLodz. A sectional drawing of this braking system is shown in theaccompanying figure, representing a form of solenoid brakeoperated in the usual manner by admitting current to the maincoil (1), which sets the piston (2) in motion, producing pres-sure on the brake rod (3), the magnitude of which variesdirectly with the amount of current flowing in the coil. Themagnetic circuit of the brake is so formed that for approxi-mately three-quarters of the stroke of the piston a pressure isexerted, which is practically constant when a const
. The Street railway journal . ong them Stuttgart, Strassburg andLodz. A sectional drawing of this braking system is shown in theaccompanying figure, representing a form of solenoid brakeoperated in the usual manner by admitting current to the maincoil (1), which sets the piston (2) in motion, producing pres-sure on the brake rod (3), the magnitude of which variesdirectly with the amount of current flowing in the coil. Themagnetic circuit of the brake is so formed that for approxi-mately three-quarters of the stroke of the piston a pressure isexerted, which is practically constant when a constant currentis flowing. At the beginning and end of the stroke the pres-sure falls off according to a predetermined value. R is a reser-voir holding a liquid, either a thin oil or a mixture of waterand glycerine. Between this reservoir and the brake is an elec-trically operated valve ( V), whose function is to control theflow of liquid between the brake and reservoir. The operation is as follows: The controller handle is turned. FIG. 2.—ASSEMBLY OF BRAKING SYSTEM; ALSO SHOWINGPLATFORM CONTROLLER from the off position through successive notches, admittingdifferent current values to the brake coil (1) until the properbraking effect is obtained, when the handle is pressed down-ward, thus admitting current to the valve coil (5) and closingthe valve (6), the space at the rear of the piston (2) in themeantime having filled up with the liquid from the reservoir. January 28, 1905.] STREET RAILWAY JOURNAL. 169 The controller handle is then returned to the off position, whichinterrupts all current, the brake pressure being retained as thepiston, cannot return to its original position, being held inplace by the liquid between it and the valve. This pressure may be retained for any length of time with-out the expenditure of electrical energy. To release the brakegradually, the controller handle is pressed downward in the offposition, which admits current to valve coil (7), opening thesmal
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
