. Electric railway journal . fcfmergence/ k,•Vain* y °- Deadmans Handle Feature of the Controller andMethod of Operating Circuit Breaker troller, if the operator takes his hand off the con-troller handle while the car is in motion an emer-gency brake application will follow. A foot valve,interposed between the controller and the emergencyvalve, can be pressed by the motorman to relieve himtemporarily of the necessity for keeping his hand onthe controller handle. The control of the brakes, the doors, the steps andthe sanding apparatus is centered in one brakevalve, shown in the illustration on
. Electric railway journal . fcfmergence/ k,•Vain* y °- Deadmans Handle Feature of the Controller andMethod of Operating Circuit Breaker troller, if the operator takes his hand off the con-troller handle while the car is in motion an emer-gency brake application will follow. A foot valve,interposed between the controller and the emergencyvalve, can be pressed by the motorman to relieve himtemporarily of the necessity for keeping his hand onthe controller handle. The control of the brakes, the doors, the steps andthe sanding apparatus is centered in one brakevalve, shown in the illustration on page 531. Thesix control positions are as follows: Release (doorsclosed) ; service (doors closed) ; lap (doors closed) ;lap (doors closed, brake handle off) ; lap (doorsopen), and emergency (doors open). The reasons. Pneumatic Door and Step Controller for having three lap positions are as follows: Onelap (doors closed) position is used while the car isbeing retarded and another is used when removingthe brake controller handle. The third lap posi-tion is necessary to hold the car on a grade after astop has been made and the doors have been openedto discharge or receive passengers. The operatinghandle of the brake valve is hinged and arranged so that a downward movement operates a poppet valveadmitting air from the main reservoir pipe to thesand box. Thus the rail can be sanded without caus-ing the operator to remove his hand from thebrake handle. An important part of the operating apparatus isthe pneumatic door and step controller, the parts ofwhich have been so perfected that they are abso-lutely interchangeable. The controller can bechanged from right-hand to left-hand operation bysimply moving a plug supplied for that purpose. Thesize and weight of the doors to be operated are oftennot known wit
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
