Patent GB-1498795-A (GB)
Title: Method and apparatus for cleaning containers
IPC: B05D1/18
Filed: 1974-03-21
Abstract: 1498795 Cleaning containers J M JACKSON 21 March 1975 [21 March 1974] 12651/74 Heading B8T Apparatus for cleaning open-mouthed containers by circulating cleaning fluid in a closed system comprises a pot assembly 28 having a body 38, core 42, lid 58, defining together a cavity 46 in which a container 47 can sit mouth downwardly to subdivide the cavity into two chambers such that cleaning fluid entering through duct 70 or ducts 50, 49 can be circulated through the chambers and across the inside and outside surfaces of the container. Valve means such as valve member 73 are provided to prevent egress of cleaning fluid in the absence or improper seating of a container. The process may be automated by providing a plurality of such pot assemblies on a rotating turret 14, travelling anti-clockwise as viewed in Fig. 2, together with a container loading station Y and unloading station X. The lid 58 is connected to shaft 81 via sleeve 80 mounted rotatably and slidably on the shaft and slidably on a bush 82. Abutments on the shaft and sleeve having frusto-conical surfaces 87, 88, biased together by spring 90, acts as a friction clutch to transmit piston from the shaft to the lid via the sleeve. The lower end of shaft 81 is fitted with cam rollers 101, 102, adapted to travel in a horizontal cam track 96, between cam blocks 106, 107, and in a vertical cam track 97 between cam blocks 112, 113, respectively. The ducts 70, 50 in the pot assembly 28 are connected via flexible pipes 30, 31 and ducts 120, 121 in manifold ring 29, respectively, to the fluid supply and exhausting pipes 132. The timing 9, and length of the cleaning, rinsing and drying operations may be controlled by means of arcuate grooves (Fig. 7, not shown) in a distribution ring 33 provided between the pipes 132 and the manifold ring 29. With a pot assembly loaded with a container and with the lid closed, the mid point of the path travelled by rollers 101, 102 can be represented by points A and C respectively, in Fig. 1 during the cleaning cycle. At cam block 106, the roller 101 and hence the shaft and lid is raised to point B and along the block 112 the roller 102 is moved radially inwardly to part D causing the lid to be moved clear of the body of the pot assembly. Compressed air applied to ducts 50, 49 ejects the cleaned container at X. At Y, containers fed mouth-downwardly are seated by means of suction applied to duct 50, 49 and centred in the cavity 46 by means of fins 54 on ring 41 attached to the cone 42. Cam block 113 moves the roller 102 out from D to C, thereby placing the lid over the body and block 107 lowers the roller 101 from B to A, thereby closing the lid and starting a new cycle of cleaning. The apparatus is stated to be particularly useful for cleaning using toxic fluids such as trichloroethylene. Additional ducts (142), (143) may be provided in the base of the pot assembly, Fig. 10 (not shown), to exhaust the cleaning fluid or the lid and shell may be integrally formed and fluid supplied and exhausted through ducts 70, 50, Fig. 9 (not shown) or arranged to be exhausted from between the base and the shell, Fig. 8 (not shown).