GB1304659A - - Google Patents

Abstract

1304659 Flushing cisterns V D ROOSA 1 July 1971 [8 July 1970] 30814/71 Heading E1C An operating mechanism for a syphonic flushing cistern comprises a float 9 which serves the dual purpose of controlling a water inlet valve and being adapted when depressed by a manually operated device to act as a piston in a cylindrical chamber in which it fits with a small clearance, and when so actuated to force water through a conduit leading from the chamber to a position below the shorter leg of a syphon tube of U-shape mounted externally of the chamber, so as to start syphonic action to generate a flush. In the preferred embodiment of Fig. 1, the float chamber 6 and svphon tube 7 are formed integrally from plastics material, together with the conduit 10 and a second conduit 5d which communicates the outlet side of the inlet valve 11 with the interior of the syphon tube at a position approximately centrally of the crown portion of the syphon tube. The conduit 10 is bifurcated to straddle the conduit 5d and communicate with the interior of the float chamber 6. Valve 11 is connected to the float 9 by a rod 11c passed through a tube 18 which extends upwardly beyond the water level in the tank when the tank is full. A flow restrictor 24, 25 is fitted in the water inlet, the member 24 of which is of resilient material whereby its aperture 24a is automatically adjusted in diameter, owing to compression of the material, in accordance with the water supply pressure. In operation, manipulation of a handle 44a rotates a shaft 44 to cause a curved arm 44b to depress the float 9, whereupon valve 11 is opened to deliver water via conduit 5d to the interior of the crown of the syphon 7, and at the same time water is forced from the chamber 6 via conduit 10 to outlet 10a where it enters the shorter leg of the syphon tube, whereby syphonic action is rapidly initiated. After the main flush is completed the tank is refilled via the conduit 5d and the shorter leg of the syphon tube and at the same time, owing to the positioning of the entry into the syphon tube of conduit 5d, a small portion of the incoming water goes down the longer leg of the syphon tube into the toilet bowl to ensure that the bowl is filled to a desired height determined by the usual trap in the bowl outlet. The size of the flush may be varied by raising or lowering the free end of a tube 80 connected either pivotally or resiliently to the shorter leg of the syphon at 81. Raising and lowering is effected by manually rotating a knob on the exposed end of a sleeve 46 surrounding the shaft 44 to wind up or unwind a cable 82 connected to the free end of tube 80. Other means may be used for this purpose. In a second embodiment, Fig. 8, the integral conduit 10 is replaced by a conduit 102 adapted to be fitted to the lower end of the float chamber 87 and the conduit 5d is replaced by a narrow bore tube 99 passing up within the shorter leg of the syphon tube 101, the tube being solely for assisting the start of the flush and refilling the toilet bowl, the main flow of inlet water from the inlet valve 96 being through apertures in a plate 98 and by way of the float chamber. In a further embodiment (Fig. 11, not shown) the arrangement is similar excepting that the narrow bore tube passes over into the longer leg of the syphon and the inlet valve is above the water level in the tank. In a yet further embodiment (Fig. 13, not shown) the narrow bore tube is omitted and part of the incoming water passes directly to the tank.