652 



THE INDIA RUBBER WORLD 



June 1. 1921 



sizes. The halves are held together firmly by four large bolts. 

 This inold localizes the heat in either one side or the other when 



Western 7 .\nd 8-inxh Combin.^tion Mold 



curing side-wall, rim cut, spot or bead jobs. One side of the 

 mold is stationary, bolted to the feet, and the other side adjusta- 

 ble horizontally so as to be changeable from one side to the 

 other. 



This vulcanizer can never become obsolete in size should tire 

 manufacturers increase or decrease the percentage of oversizes 

 on seven and eight-inch tires. 



MILLER TRUCK TIRE MOLDS 



The Miller adjustable sectional vulcanizcrs handle casings from 

 5 to Syi inches in size. A special patented feature of these molds 



Miller Adjustable Vulcanizer 



is a steam-jacketed sectional cavity having air-cooled flanges 

 and adjustable bead molds or bead straps working up and down 



on the straight-side walls of the sectional cavity. In this manner 

 several different sizes of tires are fitted into the same cavity with- 

 out using reducing shells. The bead molds which fit into the same 

 cavity are so designed and constructed that they will take in 

 different styles of beads on different sizes of tires in the same 

 cavity. Special bead molds arc furnished to repair different 

 styles, as regular clincher, Q. D. clincher or straight-side beads. 

 The vulcanizers are steam-jacketed all around the cavity and are 

 cast in one piece. This method of direct contact with hot walls 

 insures a more even cure on the rublier. The bead molds are 

 made to fit old tires by simply sliding up a little higher on the 

 straight polished surface of the vulcanizer. They never pinch or 

 wrinkle the fabric or damage the tire in any way. Quick detach- 

 able clincher tires are repaired with regular clincher bead molds. 



The Miller sectional vulcanizers will repair inner tubes satis- 

 factorily by clamping them on the straight surface in the cavity 

 with two clamps which are furnished at an extra charge. The 

 air-cooled flange is cither attached or cast on. Builer, steam- 

 ;jage and pop-valve are furnished with all vulcanizers, two pairs 

 <it clincher and straight-side bead molds, base, and clamp. .•Ml 

 sizes of one-cavity en bloc sectional vulcanizers are for steam line 

 or with boiler and high stand for gasoline or gas burner. 

 ZWEBELL'S VULCANIZERS 



The Zwebell S-8 vulcanizer is equipped with a split aluminum 

 reducing shell wliich reduces the 8-inch mold to 7 inches, and 

 then to 6 inches. One pair of straight-side bead molds are fur- 

 nished with each outfit, 

 also two spacers to be 

 used when 7 and 8-inch 

 tires are being cured. 

 The S-8 combination sec- 

 tional mold is furnished 

 either wHthout or with 

 boiler. Factory tests 

 show that this outfit will 

 steam to 50 pounds in 50 

 minutes, but this will 

 vary according to size of 

 gas line and pressure of 

 gas, in different localities. 

 The mold is drilled and 

 tapped to be connected 

 to a common steam 

 line. Steam is admitted 

 through one of the two 

 34-inch openings in the -Zwebell s b-S Vvlmxizer 



side of the mold and condensed steam is returned to the boiler 

 through the -JcJ-inch opening provided in the base of the pedestal. 

 A 1 54 -inch steam chaml)er evenly heats the mold. The length of 

 curing surface of the 8-inch mold is about 32 inches, with 7-inch 

 shell inserted the surface is about 30 inches, and with the 6-inch 

 shell, about 28 inches. Instead of a pedestal, the mold is mounted 

 on floor flanges if a generating plant is desired. 



FREDD'S INTERCHANGEABLE MOLDS 



Fredd's special all-size truck-tire mold is designed so that no 

 matter how tire types change in the future, only two new tread 

 plates need be gotten to bring that mold up to date. The mold 

 is designed to handle repair work and retreading on all sizes of 

 truck tires up to 48 by 12 inches. 



Molds and parts are made interchangeable. Tread plates are 

 furnished with the molds to cover every style of tire now on the 

 market. .X feature of this mold is the flat top bases on which 

 the tread plates for cither flat or round type tires are placed, and 

 when retreading smooth, ribbed, or non-skid treads. 



The base and tread plates are placed between the sides of the 

 mold and held by bolts which pass through holes with metal 

 around them. No gaskets are used. Steam hose connections are 

 then made and the tire, with the air bag within it, is inserted be- 



Zwebell's S-8 VvLC.»i 



