Jl-NF. 1, 1921 



THE INDIA RUBBER WORLD 



651 



Pneumatic Truck-Tire Repair Wilcanizers 



MAN-UFACTURERS of tire repair tquipmciit have con- 

 sistently kept pace witli tlie development of the giant 

 pneumatic tire. There is today a great variety of types 

 of equipment for vulcanizing pneumatic truck tires. There is 

 ilso a great diversity of opinion in resjicct to the .success of 

 different methods of adjusting molds to I'lt more than one size 

 of tire. The object of this article is not to point out the best 

 method of vulcanizing truck tires, or the molds which will 

 best serve present and future requirements of the tire repair 

 man, but to bring to the attention of our readers the develop- 

 ment of truck lire repair equipment. 



AKRON- WILLIAMS EQUIPMENT 



The .\kroii-\\'illiams pneumatic truck-tire sectional vulcan- 

 izers arc made in five sizes, to handle 6, 7, 8, 9 and 10-inch 

 tires, in two types — one for round tread and the other for flat 

 tread tires. Tlicse are assembled in two types — one mounted 

 on short legs and fitted to take its steam supply from an outside 

 source or separate steam connection, the other equipped so 

 that it will generate its own steam. The self-contained, steam- 

 generating, sectional vulcanizcrs are provided with boiler, safe- 



to generate its own steam, the other to take its steam supply from 

 an outside source or separate steam connection. Five side-wall 

 plates, carefully maclnned, go with the equipment to care for the 

 five sizes of tires. The clamping arrangement gives positive pres- 

 sure on the repair by means of an iron plate on a sand-bag in- 

 serted in the tire. The sand-bag is not furnished with the equip- 

 ment. Adjustable hooks at both ends of the steam plate can be 

 hooked over the lower bead of the tire when in position and 

 the pressure-arm crank, by reversed movement, can then be 

 utilized in spreading the beads apart so that the sand-bag and iron 

 pressure can be easily inserted. This vulcanizer serves for insert- 

 ing inside and outside patches and repairing side-wall abrasions. 

 TIRE-BEAD SPREADER 

 The tire-bead spreader is easily adjustable to any size of truck 

 tire, spreading the beads, without injury to the tire, as far apart 

 as is desired and locking against the back-pull. There is no cross- 

 arm or obstruction between the beads ; they arc held apart from 

 the outside. The spreader bolts to tlie floor. Spreader liooks are 



Round and Flat Tread Vulc.\nizers Bead Spre.\der — Inside Patch and Side-Wai.i. Vulcanizer 



.\kron-Williams Truck Tire Equipment 



ty valve, water gage, steam gage, filling funnel, valves, etc. 

 The boiler is of tubular construction, and can be equipped so 

 that cither gas or gasoline can be used as fuel. One pair of 

 crucible steel straight-side bead molds is furnished with each 

 sectional vulcanizer. The split mold construction is used, giving 

 separate steam circulation to either side of the sectional cavity, 

 thereby permitting live steam to enter one side of the cavity at 

 a time, or both sides at once. A distinctive feature of these 

 molds is the two-screw pressure yoke, one screw applying on 

 either half of the bead molds, assuring more positive and evenly 

 distributed pressure than is possible with one screw. 



INSIDE PATCH VULCANIZER 



The inside patch vulcanizer should be used in conjunction 

 with sectional vulcanizers. The best vulcanizing results are 

 secured when the tire is placed on an inside patch vulcanizer 

 and partially cured and then fitted into the sectional vulcanizer 

 to complete the cure. These vulcanizers are furnished in five 

 sizes the same as the sectional vulcanizers, and fitted with either 

 left or right-hand brackets which can be mounted directly on a 

 table or stand witliout building special support. The wrap- 

 tightening device gives effective pressure and repairs quickly 

 with little effort on the part of the operator. 



SIDE-WALL VULCANIZER 



The side-wall vulcanizer is built in two types — one with a boiler 



placed over the beads without difficulty, and the spreading is ac- 

 complished by simply pulling back the lever. It is also a great 

 help when inserting the inner tube. 



THE WESTERN VULCANIZER 



The Western one- fourth-circle molds are designed witli the idea 

 of fitting all types of treads, therefore one type mold has the 

 bottom with only a slightly curved surface on the tread and an 

 "O. G." curve to the side-wall, which practically fits all types of 

 truck tires after they have worn down a little — and the other mold 

 is the ordinary round-bottom type. These molds can be ad- 

 justed to different sizes, should any radical change occur in the 

 oversize, by widening or narrowing the spaces in the bottom of 

 the mold. The spacer is of the same metal as used in matrices 

 and bead plates, and actual test has found that the spacer has 

 the same temperature as the sides of the molds. 



The si.\-inch pneumatic truck-tire mold is designed for both 

 sectional work and retreading in anti-skid designs, and can be 

 equipped with anti-skid matrices in both diamond and rib tread 

 designs. 



As the percentage of seven and eight-inch tires taken together is 

 only about equal to that of the six-inch tire alone, a combination 

 seven and eight-inch mold without a reducing shell has been pro- 

 duced. The mold is split in halves, having two separate steam 

 chambers, and a spacer is used between the halves to change the 



