346 



THE INDIA RUBBER WORLD 



February 1, 1921 



The illustration shows the air springs in use on a motorcycle 

 with side car, and their position beneath the scats is clearly 

 seen. A motorcycle so equipped is no longer subject to ob- 

 jectionable and uiihealthful vibrations, shocks and jolts. The 

 elasticity desired is entirely under the control of the operator. — 

 Seibel Air Spring Co., 785 Market street, San Francisco, Cal- 

 ifornia. 



come through the leatherboard, appear small round rubber 

 spots. These are rubber dowels that project from the rubber 

 part of the heel, extending upward through round holes in tlic 

 leatherboard. Also, around the central suction cup of the heel, 

 which is V4-'nch deep, rise rubber walls as a suitable protector 

 inside the leatherboard. Inside the vacuum cup is the name of 

 the inventor of the heel, and the notice, "Patent pending." — Leon 

 Conant, 7 \\ atcr street, Boston, Massachusetts. 



THE "JON-CON" TIRE PROTECTOR 



.\ new tire protector combines the merits of being easily applied 

 or removed, does not heat in service and successfully reinforces 



the tire carcass. The 

 protector is made in one 

 continuous molded piece 

 of firm and elastic rub- 

 ber with a central rein- 

 forcing ply of frictioned 

 duck to render it proof 

 against blow-outs in c:isc 

 of ininor casing cuts. 

 The protector is par- 

 ticularly effective against piercing by nails. These naturally pass 

 through the tire tread; meeting the yielding protector they do not 

 pass through, but are bent harmlessly parallel to the road surface 

 by the travel of the wheel. — The Jon-Con Tire Protector Co., 2124 

 North l.Sth street, Philadelphia, Pennsylvania. 



"Jon-Con" Tire Protector 



P.NEUM.vTic Automobile Back Cushio.v 



AN INFXATABLE AUTOMOBILE BACK CUSHION 



Among the instruments of comfort for motorists is an auto- 

 mobile back air cushion 

 that, according to the 

 claims of the maker, 

 "makes the Ford ride like 

 a Packard." Its use les- 

 sens fatigue and makes it 

 impossible to feel vibra- 

 tion, jar or jolt in the 

 shoulders or small of the 

 back. The c u s h io n is 

 shaped to fit at the back 

 of either front or rear 

 seats, and has a pneu- 

 matic cushion inside. The 

 outer covering is of imitation le.ither, corduroy, or any material 

 desired, to harmonize with the upholstery of the car. — Metropoli- 

 tan Air Goods Co., Athol, Massachusetts. 



RUBBER AND LEATHERBOARD HEEL 



In an attempt to overcome the difficulty in satisfactorily attach- 

 ing the ordinary rubber half-heel, a Massachusetts man has 

 invented a heel made of rubber and leather board, for which he 

 claims distinct advantages. 



The upper part of the heel is of layers of leatherboard and the 

 lower part of rubber. These are molded together, forming a posi- 

 tive union between tlie l)ase and 

 tread, as well as effectually water- 

 proofing the leatherlioard. The 

 edges of the leatherboard are then 

 painted the same color as the 

 rubber. 



On the tread face of the heel is 

 the trade mark, "American Main 

 Spring," and the representation of 

 a frog, together with small depres- 

 sions for the insertion of the nails 

 to fasten the heel to the shoe. No 

 washers are used in this heel, 

 but on the opposite face, alter- 



nvLi." Knee Hrips 



"JoJJN Bull" Cushion 



The Conant Heei. 



nating with the places around the edge where the nails will 



RUBBER AIDS WHEN AWHEEL 



Of British manufacture are "John Bull" knee grips and cushion 

 grips for use of motor-cyclists. The knee grips are made with an 

 outer sliell of rubber of special design, enclosing air, held in shape 



by a flat plate in- 

 serted in the back. 

 A circular projec- 

 tion of rubber in- 

 side the shell pre- 

 vents collapse un- 

 der pressure from 

 the knees. The 

 knee grip is in re- 

 ality a pneumatic 

 cap for the knees, a single stout strap securing both grips to the 

 tank. 



"John Bull" liand grips are made of resilient rubber with- 

 molded air chambers, in 

 sizes for %-inch and one- 

 inch bars, with open ends 

 for inverted levers and 

 closed ends for outside lev- 

 ers. These are said to give 

 relief from aching shoulders, wrists, or hands due to excessive 

 vibration. Both the knee grips and the hand grips are made by 

 the same manufacturer.- — The Leicester Rubber Co., Limited, Post 

 Office Place, Leicester, England. 



THE MORAND CUSHION WHEEL 



The cushinn wheel for motor trucks is apparently under con- 

 tinuous development. An improved form of one previously noted 

 is the latest jMorand cushion wheel shown in the illustration. 

 These w^heels are built to standard S. A. E. specifications for 



both single and 

 dual pressed-on 

 type solid tires only 

 and are claimed to- 

 be equally service- 

 able for light ur 

 heavy duty trucks. 

 The inner molded' 

 rubber cushion is- 

 shown, containing 

 rectangular cavities 

 which afford space 

 for the rubber to- 

 be displaced luider 

 compression. The 

 cushion, with a 

 rubber gasket on 

 each side, is bolted 

 between steel chan- 

 nel rims and inter- 

 posed between the 

 felloe of the wood 

 wheel and the solid tire base. It can neither creep nor climb. 

 The wheel travels without side swaying, which permits greater 

 speed with perfect safety to the truck and its load.— Morand 

 Cushion Wheel Co., 800-902 South May street, Chicago, Illinois. 



u Cushion Wheel 



