Patent GB-712582-A (GB)
Title: Improvements relating to dishwashers
IPC: A47L15/06
Filed: 1952-10-10
Abstract: 712,582. Dishwashing machines. RUMBAUGH, H. M. Oct. 10, 1952, No. 25476/52. Class 138 (1) A dishwashing unit has a rotatable liquid slinging means mounted in a washing chamber with its axis disposed substantially horizontal, the said slinging means having an outer smoothsurfaced periphery of substantially constant radius in any given plane of rotation, and means for supplying liquid to the said periphery along the length of the slinging means whereby when the latter. is rotated liquid will be thrown or sprayed outwardly from points throughout the length of the slinging means due to contact of the li quid with the said periphery, to scour ware in the chamber. In the embodiment of Figs. 2, 3 and 5 the washing chamber 20 provided with a hinged lid 21 is pivotally mounted on a framework 11 by a shaft 12 and is normally maintained upright against a bar 14 by a spring 15. Two hollow and smooth cylinders 40. Fig. 3, are mounted on shafts 41 and rotated within the chamber 20 by a motor 45, Fig. 2, motor pulley 46, belt 44 and pulleys 43 on the shafts 41. The motor 45 is pivotally mounted in the frame 11 at 48. This arrangement normally allows the belt to be tensioned by the weight of the motor and for the chamber 20 to be tilted to project outwardly from its housing cabinet 1 to facilitate loading or unloading of the dishes, as shown in Fig. 5. In the tilted position the chamber is supported by a stop 19. Hot or cold water is supplied to the chamber through time mechanism controlled valves (not shown) a flexible conduit 27 and apertures 26, in a grid of pipes 25 on the lid 21. This water is maintained at a level so as to immerse from one sixth to one third of the surfaces of the cylinders 40, by an overflow 57 connected to a drainage system with conventional swinging or flexible fittings (not shown). The chamber is drainable at predetermined intervals through a pipe 55 and valve 56 connected to the drainage system. Referring to Fig. 3, each cylinder 40 co-operates with a fixed vane 50, extending along the entire length of the cylinder and having a curved edge 51 spaced from the cylinder surface so that each cylinder and vane edge constitute the throat of a continuous elongated nozzle extending transversely of the chamber 20. When the cylinders are rotated at high speed water will be drawn up, due to its viscosity through the nozzles and thrown with high velocity over the dishes or the like in racks 37 to effect a scouring action rather than a rinsing action. A conventional cyclic timer (not shown) for operating the inlet and drain valves is put in operation by a button 59, Fig. 5, disposed in the front of the chamber. Sealing of the lid is effected by tubes 24 of resilient material and the chamber is vented through a pipe 30 the upper end of which extends through an opening 33 in the lid 21. In the embodiment of Fig. 9, only one hollow cylinder 140 is mounted in the chamber and no cooperating vane is provided. This cylinder is mounted on a hollow shaft 141 rotated by a belt drive from a motor which belt also drives a drain pump. Water is supplied to the shaft 141 through a valve (not shown), pipe 149 and rotary joint 148. This water passes through apertures 153 in the shaft to a space within the cylinder between two spacer discs 142 and is ejected from the cylinder through apertures 154 therein. Water in the bottom of the chamber is also thrown up by the cylinder with high velocity. Unpacked seals for the shaft bearings 143 are constituted by sleeves 144 concentric with the shaft and which are of a sufficient length to baffle any spray that might enter the open ends of the sleeves. The frame 111 supporting the washing chamber 120, is in this embodiment mounted on caster wheels to enable the frame and chamber to be slid out of the housing cabinet or from beneath a sink or table. The operation of this machine is also effected by a manually started timer (not shown). Venting in this embodiment is effected through apertures in the lid which apertures are shielded by a splash shield.