THE INDIA RUBBER WORLD 



[October 1, 1918. 



HYDRO AIR-COMPRESSOR FOR 

 INFLATING TIRES. 



Ihe posMbility ol oil liciiig carried iiUo 

 rubber tires with the air when a power driven 

 air-compressor is used, may be obviated by 

 tlie use of a compressor operated by water 

 pressure. The standard garage air-com- 

 pressor here shown will deliver clean air at 

 any desired pressure, no reducing valve or 

 other device being used. The makers claim 

 that the standard compressor will deliver 40 

 cubic feet of free air per hour at 105 pounds 

 up to 110 pounds, at water pressure of 75 

 pounds; 35 cubic feet with 65 pounds of 

 water; 30 cubic feet with 56 pounds of water; 

 27 cubic feet of free air with 50 pounds of 

 water. All air pressure same as first named. 

 (The Dunn ?lydro Co., Denver. Colorado.) 



AERO AUTOMATIC FIRE ALARM SYSTEM. 



This system is built on the principle that air expands with the 



application of heat. In applying this principle, loops of fine 



copper tubing, spaced 



twenty feet apart, are af- 

 fixed to the ceiling of the 

 factory or warehouse. These 

 loops vary in length with a 

 maximum of one thousand 

 feet according to the local 

 conditions. The loop, or 

 aero circuit, terminates at 

 both ends in a flexible sil- 

 ver diaphra.t;m. Expansion 

 of the air in the tubing 

 bulges the diaphragm out- 

 wards and makes an electric 

 contact with a fixed-point 

 contact screw. The making 

 of this contact closes an 

 electric circuit, causing the 

 bells and other signals to 

 operate elYectively. ^, -•s» 



Whenever there is a variation in the temperature of the atmos- 

 phere the pressure in the aero tubing correspondingly fluctuates. 

 The pressure increases with the increased temperature and de- 

 creases with the decreased temperature. To prevent unnecessary 

 alarms an instrument called a "compensating leak valve" is in- 

 serted between the diaphragm and the aero circuit. Its function 

 is to allow the pressure in the tubing to equalize that of the 

 air outside the tubing until actual fire conditions exist. 



The alarm bells do not ring, except under fire conditions, be- 

 cause a pressure sufficient to affect the diaphragm and to make 

 an electric contact cannot be attained until the growing pressure 

 in the tubing exceeds the equalizing capacity of the leak valve. 

 Herein lies the value of the system; it is sensitive to fires at 

 their inception, sounding the alarm when the fire can be ex- 

 tinguished with the fire buckets and plant extinguishers. Each 

 fire area has its own distinctive code signal. (.Aero Alarm Co., 

 26 Cortlandt street. New York City.) 



CAST HIGH-SPEED STEEL BY NEW PROCESS. 



The Cutler-Hammer Manufacturing Co., Milwaukee, Wiscon- 

 sin, has recently built a new foundry, 50 by 75 feet, in which to 

 manufacture high-speed steel which is made by blast firing by a 

 special process and then cast. This is one of the first attempts 

 to cast hi.gh-speed steel. The foundry has a maximum capacity 

 of 1,000 pounds daily. 



MACHINERY PATENTS. 



CALENDER ADAPTED FOR FILLING MOLDS. 



MDl.I).^ art- filled witli rubber or similar c.jmposition by 

 passing them between the bottom rolls A and ,•]' of a three- 

 roll calender. The bearing- 

 blocks B of the roll .'/ are 

 adjustable by means of 

 eccentrics c mounted upon 

 shafts adjustable by worm 

 gearing c\ C. The blocks 

 B are mounted upon sup- 

 ports E having resilient 

 pads e of rubber that ; 

 adjustable by gearing 

 Tables D and D' for the 

 feeding and delivery of 

 the molds are attached to 

 the bearings B ; or con- 

 veyors may be used. (A. F. Hawkins, Spring Bank, Hough Lane, 

 Leyland, Lancashire, England. British patent No. 116,787.') 



OTHER MACHINERY PATENTS. 



THE UNITED STATES. 



NO. 1,. '74,073. Device for shaping and vulcanizing automobile-tire 

 patches. A. L. Murray, assignor to The Double Fabric Tire 

 Co.— all of Auburn. Ind. 

 1,274,465. Machine for inserting cross-wires in solid tires. W. C. Stevens, 



assignor to Firestone Tire & Rubber Co. — all of Akron, O. 

 1,275,491. Collapsible tire-core. C. Stein, Akron, O. 

 1,275,858. Tire core. V. L. Cox, assignor of one-half to A. Schonenberger 



—both of Akron, O. 

 1,275,072. Tube-wrapping machine. J. G. Moomy, Erie, Pa. 

 1,275,794. Tire-building machine with revoluble core. J. D. Thomson, as- 

 signor to The Goodyear Tire & Rubber Co.— all of Akron, O. 



THE DOMINION OF CANADA. 



184,498. Sectional core for making inner tubes. The Mercer Tire Co., as- 



signee of H. Dech— both of Trenton, N. J., U. S. A. 

 184,563. Tire-wrapping machine. O. E. Heckman, Akron, C, U. S. A. 



THE UNITED KINGDOM. 



116,774. Means for collapsing tire cores. Wood-Milne, Limited, Ribble 

 Bank Mills, Preston, and W. Ford, Meadow street, Leyland, 

 Lancashire. 



117,005. Mixing machine for plastic substances. T. E. Pointon and Per- 

 kins Engineers, Limited, Westwood Works, Peterborough. 



117,097. Machine for extruding plastic rubber, etc., in pipe or other 

 form. J. Stratton, The Lindens, Winton Road, Rowdon. 



Cottage, High Legfi— both 



THE FRENCH REPUBLIC. 



486,595. Apparatus for vulcanizina. A. Robert, A. Dessauly. and A. 



PROCESS PATENTS. 



THE UNITED STATES. 



N^ 



A NEW DIVIDED DEMOUNTABLE RIM. 



A divided demountable rim is the invention of Joseph Stungo, 

 of Edinburgli, Scotland, who has spent practically a life-time in 

 the tire and rubber business. It is most simple in construction 

 and requires no special wheels, as it will fit any wheel made 

 for a detachable rim. All that is necessary with this rim is to 

 open four hooks on the inside, which may be done with the 

 fingers, and one-half of the rim lifts ofif, leaving the casing 

 exposed for the removal of the inner tube. The repair being 

 made, the half-rim is replaced and the hooks slipped over the 

 pins, when the rim is ready for service. It can be easily adjusted 

 by an inexperienced person without the use of tools. The rim 

 is owned by the American Rim, Tire & Rubber Co., Pittsburgh, 

 Pennsylvania, a Delaware corporation. 



