| 摘要 |
<p>1,160,532. Pressure washing apparatus. BRITT TECH. CORP. 8 Aug., 1966 [9 Aug., 1965], No. 35440/66. Heading A4F. Washing apparatus comprises a pump P for supplying liquid via a conduit 19 to a nozzle 23 for discharge on to a surface to be cleaned, a pressure sensitive valve 20 for varying the back pressure in the conduit 19, and a device 26 responsive to the pressure in the conduit 19 for actuating means for supplying an additive liquid, e.g. soap solution from a container 30, to water being supplied to the pump P via a conduit 17. The valve 20 incorporates a valve member 72 (Fig. 5, not shown) pressed towards its seat (71) by springs (88, 94) which are adjustable by a trigger (84) to vary the pressure within the conduit 19. By this means an arm 27 may be actuated by the pressure responsive device 26 to cause a switch contact 28 to engage either of two contacts 37, 38. When the contacts 28, 37 are engaged a solenoid valve 36 is closed and a solenoid valve 33 is opened whereby water passes from the conduit to the container 30 to cause a flow of liquid soap therefrom past a check valve 31 to the inlet of the pump P. In an alternative apparatus the liquid soap is drawn from a container 111 (Fig. 3, not shown) at atmospheric pressure; and in a further apparatus containers 30, 120 (Fig. 4, not shown) are provided for two different cleaning agents, and the control system is operable to feed either one or both of the cleaning agents into the water flow to the discharge nozzle.</p> |
