. Electric railway gazette . 1 shows the box, which is about 30 inches long,12 inches wide and 8 inches deep, containing a pistonand pump cylinders, and connected with the pressuretank. This tank is about 38 inches long and 6 inchesin diameter, and the whole apparatus weighs about 150lbs. The box may be placed anywhere under the carfloor where the sprocket wheel can be connected withthe axle to get power to drive the pump. The tank isplaced preferably under the car seats, where it can beconveniently reached by piping to connect both endswith the box containing the brake and pump
. Electric railway gazette . 1 shows the box, which is about 30 inches long,12 inches wide and 8 inches deep, containing a pistonand pump cylinders, and connected with the pressuretank. This tank is about 38 inches long and 6 inchesin diameter, and the whole apparatus weighs about 150lbs. The box may be placed anywhere under the carfloor where the sprocket wheel can be connected withthe axle to get power to drive the pump. The tank isplaced preferably under the car seats, where it can beconveniently reached by piping to connect both endswith the box containing the brake and pump tank is partitioned into two chambers, the largerchamber is filled two-thirds full of oil and charged withair compressed to about 220 lbs. pressure. The smallerchamber is practically a vacuum. A safety valve is placedon the pressure end of the tank. The pressure gaugemay be placed anywhere upon the car. The oil is ad-mitted to the brake cylinder and controlled by a three-way valve operated by the motorman and automatically. closed by the upper rod (Fig 2) as soon as the brake hasacted. Fig. 2 shows the interior arrangement of the box con-taining the valve-operating mechanism. It will beobserved that the sprocket wheel is mounted on a shortshaft having a small crank connected to the piston rodof the pump by means of a fork connecting-rod, giving areciprocating motion to the piston. The piston andvalves are so arranged as to make it a single-actingpump. The brake-operating piston, the upper of thetwo, having a rod projecting outside of the casing, has a coupling on one end to receive the brake chain. Anymovement of the piston will operate the brake lever andso set the brakes of the car. It is also connected withthe valve by the rod located alongside of it. This pistonand its rod may travel 10 inches and is 2% inches in diam-eter, taking cubic inches of oil or about one pint tofully extend the brake rod. The lower of the two rodsoperates the three-way valve which controls t
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
