June 1, 1921 



THE INDIA RUBBER WORLD 



669 



The electric drill is a handy tool for the machine shop. The 

 electric grinder is designed for buffing, polishing, removing brands 

 or imperfections from finished tires. — W'odack Electric Tool Cor- 

 poration, 23-27 South Jefferson street, Chicago, Illinois. 



RUBBER STOCK CUTTEJl 



The accompanying il- 

 lustration shows a very 

 strongly built hand- 

 operated stock cutting 

 knife adapted for cut- 

 ting tubed rubber stock 

 for mold work or plied 

 up rubberized fabric to 

 be crosscut into strips. 

 It is made by a firm 

 that specializes in ma- 

 chinery for cutting fab- 

 rics, paper, silk and 

 leather substitutes. — C. 

 A. Harnden & Co., Hyde, near Manchester, England. 



Gi'iLLOTixE Cutter 



MACHINERY PATENTS 

 MACHINES FOR COMPACTING CARBON BLACK 



I luu tc.i suppress tlie excessive dust resultins^ truni the exten- 

 sive use of carbon black in tire stocks has taxed the inventive 

 skill of rubber engineers. The special machines described below 

 are designed to simplify the black mixing problem by the elimina- 

 tion of most of the contained air and the delivery of the black 

 in a compact condition. 



Fig. 1 shows the hydraulic press in vertical cross-section. It 

 consists of a base A containing a fluid pressure chamber B carry- 

 ing lugs C through which bolts connect similar lugs D of an 

 upper chambered member E. The latter is closed by a cap F 

 hinged at G and latched at H. Through the top of F are ducts / 

 for the escape of the air entrapped in the carbon black confined in 

 the chamber £ as pressure is brought to bear upon the material 

 by the upward movement of the ram /. The escape of carbon 

 black is prevented by a cloth screen K held between the top of the 

 chamber L and the cover cap F. — William W. McMahan, assignor 



to Morgan & Wright, Detroit, 

 Michigan. United States patent 

 No. 1,372,181. 



In the machine shown in Fig. 2, 



an outer vessel A has a cover B 



1^ arranged for being tightly bolted 



on ; a gasket clamped by a suitable 



ring device ; a rubberized bag C 



Carbon Black 

 Press 



Fig. 2. .A.pparatus for Com- 

 pacting Carbon Black 



forming a collapsible lining to A and a receptacle for the cloth 

 bag D containing the carbon black to be compressed. An inter- 

 connecting system of piping communicates with the interior and 

 exterior of the rubberized bag C. In operation the air is ex- 

 hausted from the inside of the bag C, causing the air in the ma- 



terial in the bag D to escape through the bag walls by way of the 

 upper pipe passages. After the air has been exhausted, fluid 

 under pressure is admitted to the outside of the bag C, which is 

 accordingly compressed around the bag D and thus compacts the 

 material in £) to a much reduced bulk. — ^Chester J. Randall and 

 Richard R. Taylor, assignors to Goodyear's Metallic Rubber Shoe 

 Co., all of Naugatuck, Connecticut. United States patent No. 

 1,372,190. 



RUBBER MASTICATOR AND MIXER 



The enclosed masticator and mixer shown in longitudinal 

 section in the illustration, comprises a rotor A driven by a 

 gear B in a two-chambered casing C and D. The rubber and 

 ingredients to be mixed are placed in C through an opening E, 

 which may be closed by the door F. In chamber C is a hydraulic 

 piston G, which forces the contents of the chamber into the 

 working chamber D when it is extruded by the rotor A, forward 

 and back through a limited opening between the rib H and the 

 rotor. The efTect is to plasticize and smear the mi-xture against 

 the interior surfaces of chamber D and combine the ingredients 

 in intimate mixture. The chamber D is provided with hollow 



I'"arrel Enclosed Mixek 



walls for the circulation of water for cooling the materials below 

 the heat of vulcanization. At the end of the mixing operation 

 the contents of the working chamber are emptied by gravity 

 through a special valve / on the lower side of the working cham- 

 ber D. — D. R. Bowen and C. F. Schmick, assignors to Farrel 

 Foundry & Machine Co., Ansonia, Connecticut. United States 

 patents Nos. 1,354,452, 1.355,305 and 1,356,691. 



COVERING TENNIS BALLS 



An improvement in covering tennis balls which consists in 

 wrapping pieces of a multipiece fabric 

 cover around a rubber ball and abut- 

 ting the edges of the cover without y.- 

 distorting pressure upon the ball, the 

 cover pieces being of larger total area 

 than the surface area of the rubber 

 center. The oversize cover is then 

 compacted into a smooth, snug fit upon 

 the rubber ball by heating the molds ^-, 

 and cooling the ball before removing 

 from the molds.— A. G. Spalding & Jennis Ball Mold 

 Brothers, Chicopee, assignee of Frank 



J. Faulkner, Lynn, both in Massachusetts, U. S. A., Canadian 

 patent No. 208,269. 



OTHER MACHINERY PATENTS 

 THE UNITED STATES 



NO 1,372,799 Tire repair vulcanizing device. J. J. Cotter, Phila- 

 delphia. Pa. „, ^ ^ , 

 1,373,212 Fabric cuttine ?nd winding apparatus. W. C. Tyler, 

 Kacine, Wi,';., and A. H. Koza. Akron. O., assignors to The 

 Goodyear Tire & Rubber Co., Akron, O. 

 1 373 '28 Expansible collapsil le tire core. W. G. Fording. Cleveland, O. 



