Patent GB-630675-A (GB)
Title: Improvements in and relating to dish-washing machines especially for household purposes
IPC: A47L15/16
Filed: 1946-03-27
Abstract: 630,675. Dish-washing machines. HERTZ, J. March 27,1946, No. 9545. [A Specification was laid open to inspection under Sect. 91 of the Acts, Sept. 30, 1946.] [Class 138(i)] In a dish-washing machine of the type having a number of discharge nozzles ejecting liquid under pressure periodically and successively by a fluid control mechanism comprising two members movable rectilinearly in relation to each other and provided with fluid passages which are brought into register successively thereby feeding the corresponding nozzles in succession, one of the movable members is moved in one direction by a piston working in a cylinder and the member and the piston are made as separate parts. A frame 4, Fig. 1, carrying the dishes  secured to a spindle 5 having a ratchet clutch connection 7 with a spindle 90 connected by gearing 9, 50 to a rack 48, Fig. 2 secured to a piston 23 working in a cylinder 23. During the outward movement of the piston the clutch 7 slips and a spring 8 secured at its ends to the clutch 7 and to a fixed casing 70, is tensioned. On the inward movement of the piston, which is effected by springs 52 extending between a fixed member 53 and arms 51 fixed to the rack 48, the spring 8 rotates the shaft 5 and frame 4. Attached also to the piston is one of the movable members of the fluid control mechanism in the form of a tube 33 supplied with liquid by a pipe 19 and having a pair of oppositely placed liquid outlets 34<SP>1</SP> which, as the piston moves inwardly, registers successively with pairs of outlet holes 35 in the other member 36 so that the full force of the liquid is directed in turn to a series of pipes 40 leading to spraying nozzles 41, Fig. 1. The piston 22 also carries 'the rod 14 of a valve 12 urged towards its seat 13 by a spring. This valve controls the flow of pressure liquid from the main supply pipe 10 through a pipe 16 to a threeway cock 17 which may direct the liquid to a pipe 20, to a pipe 18 leading to the cylinder 22, or to a flexible pipe 19 leading to the member 33. In operation the cock 17 is positioned to connect the pipes 16 and 18 and the valve 12 is manually opened by means of a handle 47 projecting from the rod 14. The pressure liquid thus flows from pipe 10, through pipes 16, 18 to move the piston outwardly to tension the springs 52 and 8. The cock 17 in then turned to connect pipe 16 with pipe 20 which conducts the liquid through a detergent container 26, Fig. 1, to nozzles 30 for cleaning the articles. During this time the piston 23 returns under the action of the springs 52, and the frame 4 is rotated by the springs 8. The liquid in the cylinder escapes to the drain through a valve controlled pipe 24. At the innermost position of the piston, the valve 12 closes. The cock 17 and the handle 47 are again operated to move the piston outwardly after which the cock is turned to connect pipe 16 to pipe 19 so that during the return movement of the piston the. nozzles 40 are supplied in succession with rinsing liquid as described above. In a modification, Fig. 5 the member 33, the rack 48 and the valve 12 are not directly attached to the piston 23 but are operated therefrom by levers. The member 33 is connected to the piston 23 by a cranked lever 87 permitting various relative positioning of the two parts. The transmission from the piston to the rack 48 consists of a cranked lever 89 pivoted at 99 and the rod 14 operating the valve 12 is operated by a lever 96 operated from the rack 48. In this modification the outward movement of the piston may be effected by pressure fluid admitted through a pipe 81, or the lever 96 may be provided with a handle whereby the valve may be opened by hand. The liquid used for the cleansing operation may also be arranged to be ejected periodically through successive openings in either a separate fluid control mechanism or in the same mechanism as used for the rinsing liquid. In the latter case the slide member is arranged to be rotated by 90‹ in order that the outlet holes therein register with a second series of outlet pipes associated with the cleaning operation. Specification 521,771 is referred to.