August 1, 1921 



THE INDIA RUBBER WORLD 



827 



are brought together, that does not have the same expansion and 

 contraction as the rest of the air-bag. 



\\'eaver Tire Spreader 



SPECIAL TIRE REPAIR MACHINES 

 TIRE SPREADER 



It is mechanically doing the simple operations — the minute 

 saved here and there — that in the aggregate cuts the big slice 

 off overhead expenses. Take, for example, spreading tires to 

 look for punctures, blow- 

 outs, or other injuries. 

 It is essential to do this 

 thoroughly yet no man 

 could inspect a tube as 

 rapidly b\' hand as with 

 the simple device shown 

 licrewith. The tire cas- 

 ing is placed upon the 

 rollers on top of the stand 

 and the hooks of the 

 spreader-jaw envelop the 

 bead of the tire. As the 

 foot-lever is pushed down- 

 ward, the casing is spread 

 open for inspection. 



When the break has 

 been located, the hooks carried at each corner of the auxiliary 

 buffing plate are thrown over the bead of the casing, holding it 

 permanently in a convenient position for repairing. The buffing 

 plate is convex in shape and conforms snugly to the underside 

 contour of the casing. This gives a solid backing to perform 

 the operations necessary for vulcanizing. The wide base enables 

 the heaviest passenger-car tire to be supported without over- 

 balancing the spreader. It is strongly made to withstand the 

 abuse of service, yet weighs but 70 pounds and is easily carried 

 to any part of the shop. 



UNIVERSAL TIRE CHANGER 



A tire changer, invaluable to the garage or repair man, suit- 

 able for changing all sizes and styles of demountable rim tires, 

 is here shown. Every operation in the handling of the tires 

 and rims is done by 

 means of smooth-finished 

 rollers or by steady con- 

 tracting or expanding 

 pressure, without injury 

 even in the most stub- 

 born cases. Three heavy 

 jaws radiate from the 

 center and are worked by 

 screws controlled by the 

 crank-handle. These grip 

 the rim and hold it se- 

 curely. The horizontal 

 ann which carries the 

 rollers and other attach- 

 ments is manipulated by 

 hand. In position the tire 

 rim rests within a pocket 

 at the base of each jaw. 

 The outer lip engages the lower edge of the rim and draws it 

 inward, as the jaws contract, by means of the crank handle. As 

 soon as the rim is contracted, the tire is lifted off. In remounting 

 the tire the operation of the jaws is reversed, using an expanding 

 pressure directed against the inside of the rim by a reverse motion 

 of the crank handle. 



The appliance is adapted also for forcing sprung rims closed; 

 removing lock rings and corroded tires, or mounting plain 

 clincher tires. — Weaver Manufacturing Co., Springfield, Illinois. 



Weaver Tire Chancer 



MACHINERY PATENTS 



MACHINE FOR CLEANING PLASTIC MATERIALS 



/^RUDE CHICLE and low-grade guttas used in the preparation 

 ^of chicle substitute and in the manufacture of plasters and 

 adhesive tissue always contain foreign matter that cannot be 

 removed by an ordinary 

 washer. 



The mill here shown 

 effects tliorough clean- 

 ing of soft plastic mate- 

 rials by a single treat- 

 ment. The machine con- 

 sists of three parallel 

 rolls .-;, B and C, set in 

 the same plane in hous- 

 ings D resting on a sup- 

 porting frame E. These 

 rolls are cored and piped 

 for temperature control 

 and can be adjusted by 

 screws F. A series of 

 scrapers C, H and / ad- 

 justably contact on roll 

 C for the removal of the 

 cleaned gum which falls 

 from scraper / into a re- Plastic Gu.m Washer 



ceiving pan /. 



In practice, water is sprayed on the rolls through the spray- 

 er K, and the previously heated gum is fed between the rolls A 

 and B where it is subjected to a stream of water. The gum ad- 

 heres to the rollers and is thoroughly washed by being carried 

 through the heated water in the pan M. The gum, carried by 

 the roll B, is gradually transferred to roll C which, traveling in 

 the direction of the arrow, carries it to the scraper G and under 

 the spray /,. Scraper C is adjusted against the roll C to prevent 

 the passage of any but very small particles of foreign matter, 

 thus partially cleaning the gum. 



The gum is then carried by the roll to scraper H adjusted to 

 leave only a minute clearance from the surface of the roll 

 and holds up all the remaining foreign matter. A minute film 

 of cleaned gum is left on the roll and passes to the scraper / 

 which removes it and permits it to drop into pan /. In time 

 all the gum passes under the scrapers and collects in the pan / 

 thoroughly cleaned.— Albert Suehy, Jr., Newark. New Jersey. 

 United States patent No. 15.060. Reissued March 8, 1921. 

 (Original No. 1,247,173, dated November 20, 1917.) 



BOOTS CURED UNDER DIFFERENTIAL PRESSURE 



In the manufacture of rubber boots by the differential method, 

 the various parts are assembled upon a hollow last which is 

 perforated at the sole, thus bringing the interior of the last into 

 communication with the fabric lining of the boot. During vul- 

 canization the exterior of the boot is subjected to a fluid pressure 

 greater than that of the pressure within the interior of the last 

 and boot in order to remove any entrapped fluid. 



The effect of the differential of pressures during the heat of 

 vulcanization may force the rubber coating of the lining through 

 the latter and into contact with the last. The adhesion resulting 

 greatly resists stripping the boot from the last. To obviate this 

 there is interposed between the lining of the boot and the last a 

 cheap, light-woven porous fabric, such as cheese-cloth, which will 

 become incorporated into the boot structure by adhesion to the 

 lining, and is sufficiently strong to withstand the strain necessary 

 to pull it from the surface of the lining when desired. — John Aim 

 and James Hughes, assignors to the Goodyear's Metallic Rubber 

 Shoe Co., all of Naugatuck, Connecticut. — United States patent 

 No. 1,368,682. 



