Motor Pump for Fire Flydrant
Herewith is illustrated a new motor-pump firehydrant invented by Hugh Thomas Dunn, Captain of Engine Company 90, New York City fire department. This apparatus has been patented, the serial number being 855,715. It has for its primary object to dispense with the ordinary fire engine, the water being forced from the hydrant by a pump located in it, the power for the pump being set in operation by the water flowing from the main into the hydrant. The illustration shows a longitudinal sectional view of a hydrant constructed in accordance with this invention. The lower section of the hydrant is attached to the main in any desired manner. Secured on the section is a second section and above this a housing or hood. At the base of the lower section is a valve seat co-operating with a valve head and projecting upwardly from the valve head is a valve stem, the upper end of which is screw-threaded. This screw threading extremity of the valve stem is adapted for threaded engagement with a yoke. The upper squared extremity projects through the top wall of the housing or box. Mounted in the upper section is an electric motor and extending downwardly from it and surrounding the valve stem is a hollow shaft, upon the lower end of which is mounted a rotary pump resting on a spider bearing. The motor is supplied with a current from any suitable source by means of conductors passing through a pipe, and connected in a circuit are an automatic switch and a manually operated switch. Mounted in a perforated cylindrical member is a float which is connected by means of the vertically extended float rod being guided in its vertical movement by the guides. A washer is adjustably secured to the float, the washer being maintained in its position by a nut. It closes a passage in the partition for the float rod. There is a stuffing box between the partition and the shaft.
In the operation of the invention when the hose has been attached to the nozzle the squared end of the yoke is turned by a wrench and the valve opened. Water then enters the cylindrical member and the float rises, thus closing the motor circuit by means of the automatic switch. This causes the motor to set the pump in operation whereupon the water is drawn from the main and forced from the hydrant under pressure. Gauges on the nozzle indicate the pressure of the water when it leaves the hydrant. If the pressure is too great, the relief valves below the nozzle are opened, thus permitting a portion of the water to enter the mains by means of return pipes, only one of which is shown in the illustration. The relief valves may be so placed as to discharge this surplus pressure directly to the atmosphere if so desired, these valves being of the three-way type. If on the other hand more pressure is needed the manually operated switch is operated to supply the motor with more current, thus increasing its speed and that of the pump. Hand holes are provided in the section and housing for the purpose of allowing the, operation of the switch, filling the oil receptacle which serves to lubricate the movable parts, etc. An electric meter and drain holes to prevent freezing of the water in the hydrant are also shown.
(Continued on page 902)
Motor Pump for Fire Hydrant
(Continued from page 887)
By means of this hydrant the inventor claims that the pressure of the main supply will be greatly increased without the use of separate pumping apparatus, automatically from the turning on of the water from the main.