March 1."1921 



THE INDIA RUBBER WORLD 



421 



38. 



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41. 



42. 



ASPHALT TIRES 



Asphalt, bitumen, cellulose, wood pulp and other materials are 

 used. An American method, which is also patented in Germany, 

 provides for the filling of a heavy U-shaped rim with asphalt. 

 While inserting the material in the rim, sand, corundum, iron 

 filings and other hardening fillings are added to the mixture to 

 make the tire harder in its outer parts, Fig. 38. An English 

 patent provides for a filling of 30 per cent sawdust, 25 per cent 

 oxide of magnesia, 10 per cent corn flour, and 35 per cent 

 chloride of magnesia. This mixture B, in Fig. 39, is filled in 

 the rim and covered with an iron tire A which is perforated at 

 intervals. Fig. 40 is a reinforced concrete tire, the frame of 

 which is made of four wire rings d covered by a wire mesh n. 

 This tire is fastened to the rim by bolts s. A British tire is made 

 of pieces of a wooden material s. These pieces are fixed into a 

 U-rim f by means of three bolts b. The surface of the tire is 

 made more elastic by a profile of various designs, Figs. 41 and 42. 



Finally may be mentioned a tire where the inner composition 

 material is covered by a ring made of cord woimd tightly around 

 the inner tire. The cord may be protected by a running surface 

 of metal. 



DEMOUNTABLE RIMS OF NEW DESIGN 



HPhree new types of wheel rims have been developed which 

 * are of interest both to users and manufacturers of tires, 

 inasmuch as they are demountable and adaptable to wire and disk 

 wheels. 



The base of the wire wheel rim A, in the accompanying illus- 

 tration, is made of hot rolled mill section, low carbon, deep draw- 

 ing stock, in which there is said to be very little cracking or dis- 

 tortion in cupping or punching. This type of rim lends added 

 strength to the wheel, due to obtaining a greater angle of front 

 and rear spokes ; and this also makes it possible to secure wood 

 wheel treads on most cars. The lock ring is of high carbon, hot 

 rolled mill section, heat treated. It is claimed that once this ring 

 is placed on the rim, there is no possibility of throwing it off, 

 also the assembling and removing can be accomplished with ease. 



All front and center spokes are laced in the outside channel, 

 thereby permitting the use of shallow clipping and shorter spokes. 

 The outside channel reinforces the entire outside circumferential 

 surface of the wheel. The low channel shoulder is 9/32 of an inch 

 less in diameter than the tire base, allowing the tire to be slipped 

 over it, and doing away with all forcing or jamming. The ring 

 shoulder locks with a fifteen-degree grip of the channel shoulder, 

 making it impossible to uidock the ring when the tire is inflated. 

 The pressure of the air in the tire forces the latter against the 

 lock ring itself with an additional locking strength of seventy 



pounds to the square inch, and eliminates the danger of the ring 

 being blown or knocked off. A slot J-^-inch long is cut into the 

 ring, and when the tire is not inflated the ring is removed by in- 

 serting a screw driver into this slot and giving a slight upward 

 pressure. 



B is the demountable rim, the steel flange of which covers and 

 supports the outer edge of the felloe, protecting it from impact 

 with the curb, etc. A combination of a T and a Y bar of great 

 strength is formed where the flange joins the rim. The rim is 

 held firmly in place by bolts inserted through six holes equidistant 



\\'iRE Wheel Rim Dem( untable Rim Disk Wheel Rim 

 The Johnson Demou.vtabi.e Rims 



on the flange. The flange covers the outer circumference of the 

 wheel, hence it is impossible to get the rim on wrong, and when 

 put on, the weight of the tire and the rim causes it to fall into its 

 proper position, the flange fitting tight against the felloe. 



C is the disk wheel rim, the steel flange of which begins in a 

 curve and ends in a straight line. The disk can be welded, riveted 

 or bolted to the flange, depending upon the type of the disk. The 

 flange supports and reinforces the disk around its entire circum- 

 ference. The inverted Y-section of the rim and channel prevent 

 a dishing of the disk or wheel from strains or stresses transmitted 

 from the road. — Johnson Rim . & Parts Co., Buffalo, New York. 



STRAIGHT-SIDE TIRES ON STRAIGHT-SIDE RIMS 



The use of the regular straight-side casing on a clincher rim 

 will quickly result in a ruined tire and a blow-out. Injuries of 

 this kind may be prevented by the use of a bead filler strip in 

 the clinch of the rim. The prevention, however, is almost as bad 

 as the injury, for the resultant effect on the tire is increa.sed side 

 sway, as the support of the tire is concentrated at nearly one 

 point on the base of the rim. The correct procedure is to re- 

 place clincher rims with straight-side rims, which will add greatly 

 to the pleasure of motoring at a cost incommensurate with the 

 safety and comfort attained. — Miller News Service. 



