HYDRAULIC ELEVATORS , THEIR DESIGN, CONSTRUCTION, OPERATION CARE AND MANAGEMENT - 1910 - CONTENTS - Fundamental Principles of Different Types .................. 1 Cunt erbalancing-The High-pressure System ............... 11 Plunger Hydraulic Elevators-Plunger Elevators ............. 18 Horizontal Cylinder Types- Pushing and Pulling Types . . 21 Counterbalancing the Lifting Ropes of Elevator Cars . . . . . . . . . 25 General Arrangement of Hydraulic Elevator Systems . . . . . . . . . 30 Vertical Hydraulic Elevators-Simple Low-Pressure Vertical Type Otis Elevator with Hand-Rope Control . . . . . . . . . . . . . . 33 Low-Pressure Vertical Elevators, Lever Control . . . . . . . . . . . . . . 45 Pilot-Valve Control-Regulating Valves-Speed Regulating Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Safety Devices .................. ........................ 60 Good Features of Magnetic Valve Control Obstacles that Pre-r vent its General Use-Descriptions 6f Control Systems ... , .. 66 Magnetic Controller for Battery Current ..................... 70 Double-Power Hydraulic Elevator System ................... 79 Otis, Running-Rope System ...................... . . . . . . . . 85 Principal Causes of Disordered Mechanism and How Prevented or Removed-Directions for Packing pistons or Valves ..... 89 Automatic Devices Used for Stopping Cars at Top and Bottom Landings Their Care and Their Value as Safety Appliances . . 100 Effect of Stretching of the Rop ........................... 106 Construction of Traveling-Sheave Frames, Foundations and Supports. to Avoid Piston and Cylinder Friction ........... 112 Why the Pistonis Weighted ..................... ......... 120 The Electrical Features of Vertical Cylinder Elevators. ith Magnet Control Operation and Care of Pilot Valves and Connecting Mechanisms ................................. 123 Horizontal Hydraulic Elevators .............. .. . . . . . . . . . . . . 131 Description of the Pulling Type of Horizontal Elevator. Showing the Operating Principle of the Whittier Machine .... 142 The Marse-Williams Construction and Operation of the Valves ................................................ 147 Crane Horizontal Pushing Machine How the Stop-Motion Gets Out of Adjustment the Cylinders. and Other Parts .... 155 Crane Horizontal Machine Description of Automatic Stop Valve Packing the Main Piston and Cylinders ............. 159 Construction Details of the Whittier Machine with Special Reference to the Stop-Valve Mechanism ................... 165 Overhead Sheaves and Bearings Kind of Lubricant Best Suited for Them Discharge Pipe Relief Valves the Use of Strain-ers When Required .................................... 171 Discussion Relative to the Details of the Morse and Williams Pulling Machines .................................... 176 330524 . l . - 2-C . L - G, A CONTENTS CHAPTER PAGE XXIX. High-pressure Hydraulic Elevators.. ........................ 187 XXX. Operation of the Main and Pilot Valves. of the Otis Vertical Elevator-the Electrical Control Sometimes Employed.. .... 198 XXXI...