Patent GB-1130796-A (GB)
Title: A valve-discharged flushing cistern
IPC: E03D1/34
Filed: 1966-11-09
Abstract: 1,130,796. Valve-discharge water-waste-preventing cistern. R. BOCCARD. 9 Nov., 1966 [9 Nov., 1965; 3 June, 1966], No. 50330/66. Heading E1C. A flushing cistern comprises a container 1 (Fig. 1) having an inflow port 7 and a valve seat 6a for an outflow port of greater crosssection, a valve closure member 9 therein movable from a closed to a higher open position, biassing means, e.g. a spring 11, to close the member 9 covered by a cover 8, between which and the member 9 is a chamber C<SP>1</SP>, C<SP>2</SP>, with which communicates duct means to lead water thereto, and means to produce water flow therefrom to cause the upward force on the member 9 to exceed the downward force thereon to open it. The upward, force is applied to a portion of the member 9 projecting from the seat 6a. The duct means includes a clearance and apertures 8d in the cover 8, the flow-producing means including a conduit 10 from the chamber C<SP>1</SP>, C<SP>2</SP> and a pilot valve mounted in the flushing pipe 6 to permit flow through the conduit 10. The pilot valve comprises a housing 10b, with a valve seat at the free end, closed by a second valve member 15 for no discharge with an aperture 15a through which extends an opening plunger 12a moveable to displace the member 15, third and fourth valve closure members 12b, 12c on the plunger 12d to close alternately the aperture 15a, and a spring 16 to close the member 15 together with the water in the chamber C<SP>1</SP>, C<SP>2</SP>. In a modification the pilot valve is mounted on the container top wall 1a (Fig. 6), through which the member 12a extends, the conduit 10 leading to it, the conduit 22 leading from it to the outflow port. Fig. 9 shows a form wherein a valve closure member 27 of a pilot valve is lifted by pulling a rod 23 to give initial flow through the hole 9d, the member 9 being then opened by an upward force thereon. In a further modification (Fig. 10) a pilot valve is opened by a sliding member 28 extending down through the member 9 to the upper end of which it is applied through a member 27, a cam shaft 33 being turnably mounted in the pipe 6 on which is an eccentric cam 32, co-operating -with the lower end of the member 28 to displace it upward to open the member 9, the shaft 33 being turned by an arm 34. In a still further modification (Fig. 13) the biassing means is a flexible annular part 9e of the member 9 to the undersurface of which an opening force is applied by the water in the container and encircled at the outer periphery 9f thereof by a ring 39 on which it rests, portions of the ring 39 and the base wall with supports 40 defining apertures to permit access of water to the undersurface, the cover 37 being connected to the periphery 9f. For duct means there are changeable bushes 37c in the cover 37 having a flange 37a engaging between the part 9e and the annular lip portion 9g on the member 9. In a variation the cover has a side wall integral with the ring 39 and top wall separate therefrom. In a final form (Fig. 17) (not shown) there is a top push-button-operated pilot valve, the compression spring may or may not be retained, the base wall 4 has items associated therewith as shown in Fig. 13 apart from the pilot valve and conduit 10 and a non-return valve is in the top wall for automatic replacement of any air escaping during flushing.