586 



THE INDIA RUBBER WORLD 



[June 1, 1920. 



When the center tire has made one revolution, the operator 

 throws up the handle, which stops the spraying and causes all 

 three tires to roll towards the right, thus placing another shoe 

 in position to be coated, and rolling the finished tire into the 

 wrapping rooin. The complete machine is 7 feet high and oc- 

 cupies a floor space 4 by 12 feet, and may be operated by a girl 

 or one-armed man. (The O. Hammel Co., 209-213 Fourth ave- 

 nue, Pittsburgh, Pennsylvania.) 



S. & B. FLEXIBLE STEEL MOLDS. 



Flexible steel molds for making straight-side or clincher tires 

 by the full molded process are said to have fully demon- 

 strated all claims made by the manufacturer. 



The curing of either 

 fabric or cord tires on 

 solid collapsible cores is 

 made easy. Each half of 

 the mold is provided 

 with saw cuts to allow 

 contraction of the inner 

 diameter of the mold. 

 Each half is dished and 

 made to come together 

 at the tread first, then by 

 applying pressure the 

 mold is closed gradually 

 and progressively toward 

 the beads, forcing the air 

 and excess rubber ahead 

 of the contact points, 

 stretching the fabric also 

 and finally landing the 

 surplus rubber into the overflow cavity A, while all harmful 

 movements of stock toward the tread are eliminated. 



By this process it is possible to use beads of larger diameter 

 than those generally used, leaving more space at B, and more 

 room for contraction of bead diameters, which allows more 

 stretch to the sides of the tire carcass during vulcanization. Be- 

 fore placing the tire in the molds, beads and sides of tire are 

 pulled loose from the core to the tread line C, leaving the tread 

 portion cemented to core. (Swinehart & Byrider Process Co., 212 

 Second National Building, Akron, Ohio.) 



HIGH PRESSURE SECTIONAL VULCANIZER. 



An improvement over the old-style kettle, or wrapped process, 

 is claimed for the Soper high-pressure retreading machines and 

 sectional molds. .A.mong the advantages noted are : wood fiber 



marking blocks 

 that keep the rub- 

 ber from over- 

 flowing; semi- 

 cure, keeping the 

 rubber from over- 

 curing on lap, 

 which 



HT-SiDE Mold. 



causes 

 spot 



The Soper Retre.^der. 



often 

 a weak 

 m the re- 

 tread; no matrix 

 to break, as the 

 ribs are cut in the 

 mold ; inclosed 

 fire-box, giving 

 four times the 

 heating surface 

 found in ordinary 

 molds and mak- 



Thc vulcanizers have self-contained gas-heated boilers, al- 

 though kerosene burners can be supplied if desired ; and they 

 are made in six types, suitable for the smallest oil station or 

 the most completely equipped retread shop. (Soper Vulcanizer 

 Manufacturing Co., 110 East Eleventh street, Los Angeles, Cali- 

 fornia.) 



HONECO VULCANIZER TEMPERATURE CONTROLLER. 



In this device two controlling systems are compactly combined 

 1 one casing, one system to control the inlet steam for maintain- 

 ig the temperature in a vulcanizer, tire press, retort or any 

 closed space, and the other 

 to control the discharge of 

 condensation and wet steam 

 from the same apparatus. 

 While this combination of 

 two controlling systems in 

 one casing is not new, how- 

 ever, the systems themselves 

 are novel, and interesting. 



There are no fulcrums 

 and levers that require deli- 

 cate bearings and accurate 

 adjustment and alinement. A 

 valve is located within the 

 adjusting plug, and the lat- 

 ter projects through the 

 front of the casing, permit- 

 ting the removal of the 

 valve, without the necessity of removing the casing or loosening 

 any connection for adjustment of the air-plug. 



The air valve is the most important part of the operating 

 mechanism of any air-operated controller. The Honeco valve is 

 held against its seat by the tension or compression of the spring 

 and is lifted by the expanding capsular diaphragm when inflated 

 by the pressure actuating it. The upward movement of the 

 diaphragm prevents the valve freezing to its seat because of 

 gumming or corrosion. The adjustment or setting is made with 

 a small wrench and as the entire valve is turned, there can be no 

 change of temperature or pressure while adjustment is being 

 made. (Hohman-Nelson Co., Eau Claire, Wisconsin.) 



INNER TUBE VALVE NUT TIGHTENER. 



The simpk= hut important process of running up the valve nut 

 stem of an automobile tire valve is speedily and securely 



.\ir-Operated CONTI 



ing steaming up 50 pounds possible in 20 to 25 minutes; hand- 

 forged clamps that are practically unbreakable. 



Valve Nut Tightener. 



