. Electric railway journal . FIG. 1—VERTICAL SECTION OF HYDRAULIC CAR HOISTUSED AT SAN DIEGO. FIG. 2—METHOD OF SUPPORT-ING PRESSURE GAGE SO AS TO PREVENTFLUCTUATIONS IN PRESSURE INTER-FERING WITH GAGE READINGS lief valve on the pump takes care of any undue rise inpressure. To lower the car a valve is opened, allowing oilto flow from the cylinders into the discharge line lead-ing to the sump. In order to prevent interferenceshould it be desired to raise or lower two cars at thesame time, a check valve is installed in the supplyline. This prevents one man from lowering a carwhile another is in t
. Electric railway journal . FIG. 1—VERTICAL SECTION OF HYDRAULIC CAR HOISTUSED AT SAN DIEGO. FIG. 2—METHOD OF SUPPORT-ING PRESSURE GAGE SO AS TO PREVENTFLUCTUATIONS IN PRESSURE INTER-FERING WITH GAGE READINGS lief valve on the pump takes care of any undue rise inpressure. To lower the car a valve is opened, allowing oilto flow from the cylinders into the discharge line lead-ing to the sump. In order to prevent interferenceshould it be desired to raise or lower two cars at thesame time, a check valve is installed in the supplyline. This prevents one man from lowering a carwhile another is in the act of raising one. The construction of the lift may be followed by referring to Fig. 1. The collar C is welded to the plungerA and serves to limit the travel of the same. Themember L is to limit the downward travel and is con-. FIG. 3—DIAGRAM OF CON-NECTIONS AND PIPING FORREMOTE CONTROL OF ELEC-TROPNEUMATIC BELTSHIFTING DEVICE anced 928 Electric Railway Journal Vol 52, No. 21 structed of a standard 4-in. pipe. The plunger is madeof hydraulic pipes and is machined from the collar Cto the upper end. The plate P is welded to the pipe,closing the same against pressure and also this takesup the difference in diameters of the plunger and cylin-der, acting as a guide. The cylinder is made of heavy pipe. The casting No. 265 fits loosely intothe upper end of the plunger and is removed when notin use. The castings No. 266 and 267 take care ofthe angle of the car body when one end only is beingraised as is necessary with our present connections are made with standard pipes, but itWas considered advisable to use hydraulic fittings. Inoperation it was found that if the packing was tighteneduntil there were no leaks the friction was so great thatthe plungers were likely to bind, causing unsatisf
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