Patent GB-627318-A (GB)
Title: Improvements in motor road vehicles for conveying liquids
IPC: B60P3/22
Filed: 1946-11-22
Abstract: 627,318. Tank vehicles. SCAMMELL LORRIES, Ltd., HUGH, P. G., and HALL, W. F. Nov. 22, 1946, No. 34604. [Class 108 (i)] A motor - driven tank vehicle or trailer for transporting liquids or semiliquids which may be heated or cooled, or for, street washing, gully emptying &c. is provided with an electric generator driven from the engine having an automatic output voltage control regulating the current to motordriven pumps, and heating and cooling devices for the liquid in the tank. The electrical system may be coupled to a mains supply in a garage, the mains socket being provided with a safety device to cut out the electrical control devices. The tank may be mounted on the vehicle chassis or on a trailer chassis or the rear end of the tank may be mounted directly on wheels, the front of the tank being supported on a turntable on the motor vehicle. In Fig. 1 the tank 3 is mounted on a chassis 2 and the engine 20 drives an air-cooled generator 25 through chain or gear drive 21, torque limiting coupling 22, shafts 23, 24 and flexible couplings. The rear end of the tank is provided with a compartment closed by a door 8, Fig. 3, in which is installed removable, electric immersion heaters 4, filling or discharge pump 5 with motor 6 and control panel 7. The pump 5 is connected to a pipe 9, valve 10 and removable hose 11; the tank may also be filled through an opening under the dome 12. In the wiring diagram, Fig. 5, the generator 25 is connected through a junction-box 30 with an Isenthal vibrating regulator driven by a motor 32, the field circuit 33 and ballast resistor 34 being connected in the circuit. The heaters 4 are connected across the main output leads 36 and are arranged as three main heaters and two supplementary heaters controlled by switches 39, 37, the operating coils 40, 38 of which include thermostat switches 42, 43. The mains supply is connected to a lidded box 52 provided with a pair of contacts 56 bridged by a spring-loaded contact member 55 mounted on the hinged lid 53, the socket having three points so that separate plugs 58, 59, 60 can be used to connect 5, 3 or 2 of the heaters to the mains. Fig. 6 shows a gully emptying and washing tank mounted and supported on a tractor 70, a generator 71 being driven from the gear-case 72 and the current being supplied to a compartment 87 in the tank by a cable 73 for operating a motor-driven oil pump of a hydraulic ram for tilting the tank about a transverse axis 85, a motor-driven suction pump, and a motordriven high-pressure water pump which delivers clean water to a silt stirrer 83 on the main suction hose 82. The control system for the generator 71 is as shown in Fig. 5, the current being conveyed to the motor-driven pumps through individual contact type direct starting switches with push-button control. Mercury or like angle control switches are provided for breaking the circuit to the suction and highpressure pump. A refrigerating or cooling plant, Fig. 10, comprises a tractor 101 with generator 102 driven and controlled as in Fig. 6. The tractor 103 supports a tank 104 provided with a compartment 105 with side doors 107 for the refrigerating plant electric motors and controls 106. An electric cable 108, 110 leads from the generator 102 to the compartment 105. Specifications 596,486, 596,487, [Group XXVIII], and 627,319 are referred to.