Hydraulically driven industrial truck

• US 3,098,574 A
• Filed: 06/08/1961
• Issued: 07/23/1963
• Est. Priority Date: 06/08/1961
• Status: Expired due to Term

• Current Assignee: Robert F De Marco
• Original Assignee: Robert F De Marco
• Inventors: DE MARCO ROBERT F
• Application Number:
  US04/115,721
• Time in Patent Office: 775 Days
• US Class Current: 414/635
• CPC Class Codes: B60K 17/043 Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
• CPC Class Codes: B60K 17/10 of fluid gearing of fluid clutches B60K17/02
• CPC Class Codes: B60K 2007/0046 the motor moving together with the vehicle body, i.e. moving independently from the wheel axle
• CPC Class Codes: B60K 2007/0061 the motor axle being parallel to the wheel axle
• CPC Class Codes: B60K 7/0015 the motor being hydraulic
• CPC Class Codes: B60L 15/2054 by controlling transmissions or clutches
• CPC Class Codes: B60L 2200/44 Industrial trucks or floor conveyors
• CPC Class Codes: B60L 2220/46 Wheel motors, i.e. motor connected to only one wheel
• CPC Class Codes: B60L 50/52 characterised by DC-motors
• CPC Class Codes: B66F 9/07568 Steering arrangements
• CPC Class Codes: B66F 9/07572 Propulsion arrangements
• CPC Class Codes: Y02P 90/60 Electric or hybrid propulsion means for production processes
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Claims

16. AN INDUSTRIAL TRUCK INCLUDING A CHASSIS, A PAIR OF DRIVING WHEELS, A HOIST MAST CARRIED BY THE CHASSIS, A HOIST ON THE MAST, HYDRAULIC MOTORS DRIVINGLY CONNECTED TO THE WHEELS, RESPECTIVELY, A FIRST PISTON AND CYLINDER ASSEMBLAGE FOR OPERATING THE HOIST, A SECOND PISTON AND CYLINDER ASSEMBLAGE FOR TILTING THE MAST, A SINGLE UNIDIRECTIONAL DIRECT CURRENT ELECTRIC MOTOR, A BATTERY CARRIED BY CHASSIS FOR ENERGIZING THE ELECTRIC MOTOR, TWO SPEARATE VARIABLE DELIVERY HYDRAULIC PUMPS CONNECTED TO THE ELECTRIC MOTOR MEANS AND DRIVEN THEREBY, ONE CIRCUIT CONNECTING ONE PUMP TO THE HYDRAULIC MOTORS IN PARALLEL AND AN ADDITIONAL CIRCUIT CONNECTING THE OTHER PUMP TO THE ASSEMBLAGES, SAID TWO LAST MENTIONED CIRCUITS BEING NORMALLY DISCONNECTED FROM EACH OTHER, VALVE MEANS FOR CONTROLLING THE DIRECTION OF FLOW OF PRESSURE FLUID IN SAID ONE CIRCUIT OT THE HYDRAULIC MOTORS AND IN THE ADDITIONAL CIRCUIT TO THE ASSEMBLAGES, RESPECTIVELY, AND ADDITIONAL VALVE MEANS FOR DIVERTING THE PRESSURE FLUID FROM THE ADDITIONAL CIRCUIT TO THE PRESSURE SIDE OF SAID ONE CIRCUIT.