Patent GB-947393-A (GB)
Title: Improvements in or relating to flushing sanitary closets
IPC: E03D5/016
Filed: 1960-05-17
Abstract: 947,393. Sanitary closets; flushing; ventilating closets. KOEHLER AIRCRAFT PRODUCTS CO. May 17, 1960 [May 20, 1959], No. 17381/60. Heading E1C. A self-contained flushing sanitary closet comprises a closed tank 10 on top of which is mounted a flushed bowl 20 having a discharge conduit projecting into the tank 10, a manifold ring 23 around the bowl 20 as shown (Fig. 4) to direct flushing liquid over the bowl interior and into the tank 10, a pump 75 (Fig. 3) having a drive motor 90 and an inlet, to withdraw liquid from adjacent the tank bottom and discharging into the manifold ring 23, a filter to filter liquid drawn into the inlet and wiper blades 122 associated with the filter to clean it, both being relatively movable so that cleaning of the filter occurs concurrently with operation of the pump 75, and a drainage opening 188 (Fig. 14) in the lowest tank portion 150 and including a valve seat 186 flush with the tank bottom with which a remotely-controlled valve member 190 co-operates to control flow through the drainage opening 180. A spray device 180 is mounted in the tank 10, adjacent the top, and to it cleaning liquid is supplied through a connection 182. The pump 75 is reversible and the motor 90 on a housing 85 when using the closet runs the pump 75 at the beginning in a reverse direction, forcing liquid backwards through the filter to clear solids from the side thereof exposed to the tank 10, and then in a forward direction, to draw liquid through the filter and supply it to the manifold ring 23 to flush the bowl 20. The filter is cleaned by backward flow at the end of each flushing cycle. It is formed of a stack of elements between plates 112, 115 (Fig. 9) connected by bolts 116 and including alternate ring members 118 (Figs. 10, 11) with inwardlyextending parts 119 receiving the bolts 116. Between successive rings 118 are spacer members 120, the tips of which co-operate with the stationary wiper blades 122 separated by plates 123, both being mounted by bolts 125 between a cup 127 and a ring 129. The filter elements are rotated by a gear 130 (attached to a sleeve 131 fixed to the plate 112) driven by a pinion 132 on a shaft 133 secured at the top to the output gear 140 of a reduction gearing unit, having an input gear 142 in mesh with a drive pinion 144 keyed to the pump drive shaft 95. When the pump impeller 100 is operated the members 118 and 120 are correspondingly rotated but at a lower speed than it, the blades 122 riding on the rings 118 in close clearance with the ends of the parts 119 to clear solids from between the rings 118. In a modified form of filter the space between the plates is enclosed with a perforated band on the outside of which is a fine mesh filter screen. The bowl 20 has a portion 30 projecting below the tank top (Fig. 3), below which the discharge conduit 40 opens laterally, if desired, through a solenoid-operated flap valve 42. The pump 75, its motor 90, the valve member 190, and the connecting conduits 77, 78, 79 are mounted on the tank top, e.g. on a cover 11, and are removable as a -unit. The manifold ring 23 has openings 26 across which projects a deflector ring 28 to spread liquid therefrom over the interior of the bowl 20, from the interior of which an overflow tube 82 leads into the tank 10. A length of flexible expandable tubing 215 (Fig. 14) is secured between the valve member 190 and the mounting 207 to surround the valve-control tube 198 in a guide tube 200 and valve control spring 210 which biases the member 190 into sealed relation with the seat 186. Control cable 205 extends upward from the tube 198, over pulleys 217, and is then connected to a cable 225, passing through a tube 227 for connection with a suitable control on the vehicle exterior. To ventilate the closet a conduit 230 (Fig. 2) extends over the tank 10 to a position beneath the casing 60 around the bowl 20 for attachment to a fitting leading to the tank interior. The other end of the conduit 230 may be secured to a vacuum source, e.g. the throat of a Venturi supported in an airstream.