June I. 1921 



THE INDIA RUBBER WORLD 



653 



tween the sides. The bolts are then drawn up to the width that 

 best fits the tire, then bead plates are placed in position, held by 

 four bar clamps made with forked, hooked ends, wedge-shaped, 

 having a tendency to slightly draw the top of the mold, yet not 

 to tip when pressure screws are tightened. The 6-inch base takes 

 6 and 7-incli tire tread plates : the 8-inch base takes 8 and 9-inch 

 plates and the 10-inch base takes the 10 and 12-inch plates. 



Fredd's .\ll-Size Vulc.\xizer 



This mold is one-quarter circle and can be used as a steam 

 press when the base is entirely omitted. The base may be used 

 as tube plates when not otherwise in service. Each part is 

 drained and heated separately. 



THE FIShER SECTIONAL VULCANIZER 



The Fisher sectional vulcanizer has an inner steam core A over 

 which the repaired section of the tire is placed. Pads are ap- 

 plied to fill tlie depressions of the non-skid design and two outer 



side-plates, B. 



B, are placed 

 against the side 

 walls and beads 

 of the tire. Over 

 these are placed 

 t li r e e metal 

 pressure bands 

 or saddles C, C, 



C. The lower 

 ends of these 

 bands connect 

 with six heavy 

 bolts D, D, D, 

 by which the 

 bands can be 

 drawn down 

 and a strong 

 pressure a p - 



plied to the upper portion of the tire. Each band can be drawn 

 down independently and any mequality in the thickness of the 

 repair can be readily adjusted. After this operation, two specially 

 designed screw clamps E, E, are placed in position and the side- 

 plates B. B. are forced directly against the side-walls and beads 

 of the tire by tightening the hand-screws F, F, 



It will be noted in the illustration that the side-plates and the 

 ends of the side-pressure clamps are carried on two heavy rods 

 extending through and rigidly connected to the lower part of the 

 mold. These rods connect the ends of the clamps and prevent 

 their spreading, twisting, or shifting their positions, which are 

 common troubles where ordinary clamps are used. 



The combined forces of the bands over the upper portion of the 

 tire and the side-plates at the side-wall and beads provide a com- 

 plete pressure of any desired degree to all parts of the section 

 and extending to the e.xtreme points of the beads. 



Fl.SllKu'.S VULC.\N1ZER 



Duncan's Mold 



molds 



THE DUNCAN VULCANIZERS 



The Duncan truck-tire mold is similar in construction to the 

 four-cavity sectional mold and cures pneumatic truck tires in the 

 time usually required, without the use of steam-bags on the inside 

 of the tire or an addi- 

 tional cure over an in- 

 s i d e vulcanizer. .\t 

 present there are but 

 two sizes : one for 5 

 and 6-inch tires and 

 another for 7 and 8- 

 inch tires. 



Matrices or reduc- 

 ing shells are not used 

 in these molds, but the 

 cavity is self-adjusting 

 in construction. The 

 cavity walls are sloping 

 instead of straight up 

 and down, allowing the 

 plates to adjust them- 

 selves automatically to 

 the exact size and 

 shape of the tire. Bead 

 plates extend down to 

 near the tread line and 

 protect the old side 

 rubber from the exces- 

 sive heat and always effect a perfect cure of the bead. The 

 are constructed of special compound ammonia semi-steel. 



This vulcanizer is declared to embody certain technical prin- 

 ciples that enable a tire to be perfectly cured through, including 

 a cord shoe, in one and one-half to one and three-quarters hours, 

 with 45 to 48 pounds of steam, without the necessity of additional 

 heat application on the inside of the tire. An air-bag only is used. 

 The molds may be operated with gas, gasoline or steam-line con- 

 nections. Where gas or gasoline burners are used, the equipment 

 includes the steam generator. 



"DRI-KURE" EQUIPMENT 



"J3n-Kurc" .sectional truck-tire molds are quarter-circle molds 

 handling 6, 7, 8, 9 and 10-inch tires. They are equipped with 

 inlet and outlet valves, clamps, wrenches, etc., as are all "Dri- 

 Kure" single-cavity section molds. The steel clamping system 



makes this mold one of the 



strongest and most endur- 

 ing. Both the molds and 

 the bead plates are carefully 

 and accurately machined and 

 polished. The upright posi- 

 tion of the molds decreases 

 the usual time and energy 

 expended on the putting in 

 and taking out of heavy 

 truck tires. Also the effi- 

 ciency of steam-bags is in- 

 creased as the condensation 

 goes to the lower end and 

 drains off. Wood end-blocks 

 prevent mold marks at the 

 ends of cures. Pipe legs 

 with which these molds are 

 equipped enable the user to 

 change the height to suit his 

 convenience or to suit a 

 different installation. Bead plates are all made of electric steel. 

 The plates are machined down to a knife edge, adding greatly to 

 the appearance of the finished repair job as they leave no marks 

 on the sides of the tires. Inside cure forms are made in two 



"Uri-Kure" Molu 



