Patent GB-368295-A (GB)
Title: Improvements relating to a method of and apparatus for making dipped rubber articles
IPC: B29C41/14
Filed: 1930-11-24
Abstract: 368,295. Moulding rubber by dipping ; endless chain conveyers. GAMMETER, J. R., 680, North Portage Path, Akron, Ohio, U.S.A. Nov. 24, 1930, No. 35339. Convention date, Jan. 20. [Class 87 (ii).] Dipped rubber articles are made from latex or water dispersions of rubber, or solutions or cements of rubber and naphtha &c. by dipping formers into the solution and withdrawing them at a rate which is varied in accordance with the variations in the shape of the emerging portion of the former. The apparatus comprises an intermittently rotating dipping and drying formcarrying frame 31, Fig. 2, and a continuouslymoving conveyer 32 leading to a bead-rolling machine 33, drying chamber 34, vulcanizing chamber 35, and to stripping and form-cleaning means before presenting the forms for redelivery to the rotating frame. During the rotation of the frame: the dipped articles are removed at point A and placed on the conveyer while the newly cleaned formers are inserted at points A, B. After being dipped at point C, the coated formers are dried at points D, E and cooled at points F, G. After a rest interval at point H, the formers are re-dipped at point I and re-dried at point J. The frame 31 comprises a series of hollow radial arms 52, Fig. 10, having the form racks 30 mounted rotatably at their outer ends and maintained by counterweights 54 so that the formers 40 hang vertically. At the dipping station the tank 75, Fig. 7, is raised by means of two cams designed to give dwells at the top and bottom of the stroke and a controlled rate of lowering giving a slow movement near the end with a final quick break from the liquid. The tank is supplied from a hand-filled auxiliary feed tank 76 with a perforated lid both tanks being double-walled for circulation of a cooling medium. A fixed constantly-submerged valved plate 125 moves relatively to the tanks to stir the contents. The tank-operating cams also carry free cams used to operate the table, one of such cams being linked to the main clutch and the other to the locking gear which fixes the table in the interval between each stroke. At the drying stations the hollow arms 52, Fig. 10, register with ports in the central column 58 whereby hot air circulates through the interior of the formers by way of the chambers 30, Fig. 22, holes 42, and central tubes 41 to the outlets 40a. At the cooling stations the forms are suspended over a current of cold air supplied by fans. After re-dipping, the forms are dried again by hot air from the central column 58. The conveyer comprises rack-receiving members 153a carrying wheels 152 running on an overhead rail, and lugs for engaging with the roller-guided driving chains 155. The members 153a are connected to one another by articulated rods 154. At the beadrolling station the formers are rotated by engagement of the pinions 45 with fixed or driven chains and the tops of the films are brushed downwards to form beads by the rotating brushes 170. The final drier 34, Fig. 2, is heated by steampipes or hot air, while the vulcanizer 35 may contain hot water impregnated with glycerine. After vulcanizing, the articles are stripped from the formers and the latter then cleaned by wiping with a damp rag before re-use.