478 



THE INDIA RUBBER WORLD 



d^=^_ 



Referring to the drawing, A is the collapsible core, H the valve 

 stems and C the Huid-tight tubular casing of rubberized faliric 

 that is placed over the core and 

 provided with openings for the 

 valve stems. At the outer end of 

 each valve stem the tubular cas- 

 ing is held between two circular 

 washers D and E. The sectional 

 retaining ring /■' is provided wi 

 openings for the valves, and 

 when the two mold halves H and 

 G are bolted together a space 

 / is left between the casing and 

 the inner surface of the mold. 



When the fluid pressure is applied through the valve stems 

 the steam or hot water is discharged between the inner surface 

 of the tire and the fluid-tight tubular casing surrounding the 

 core. Thus the continued pressure forces the tire against the 

 inner mold surfaces during the period of vulcanization. [W. R. 

 Denman, assignor to Miller Rubber Co., both of Akron, Ohio. 

 United States patent No. 1,176,885.] 



Reinforcing I.n-ner Tubes. A tube is placed in a flattened con- 

 dition around an endless circular form and a strip consisting of 

 fabric on the outside and a layer of rubber on the inside is 

 cemented to the tube. [John H. Poole, Brockton, Massachu- 

 setts, assignor to Reinforced Inner Tube Co., Brockton, Massa- 

 chusetts. United States patent No. 1,179,033.] 



Mandrels For Splicing Tubes. Both inner and outer man- 

 drels are slotted their entire length, the latter being provided 

 with an annular passage through which air is forced, blowing the 

 end of the inner tube that is on the larger mandrel over the 

 end of the tube on the smaller mandrel, thereby forming the 

 splice. [Dempsey Lowe, East .\kron, Ohio. United States patent 

 No. 1,179,200.] 



A New Tire Building Tool. This novel tool consists of a 

 round helical spring that revolves on a suitable support and is 

 used as a hand stitcher in tire building. [Wilhelm Kaufmann, 

 New York City, assignor to Hartford Rubber Works, Hartford. 

 Connecticut. United States patent No. 1,179,528.] 



Tire Flap Vulcanizer. Flaps are made of straight fabric in- 

 stead of bias strip, formed and vulcanized on a circular-shaped 

 vulcanizer provided with clamps accommodating a plurality of 

 flaps. [Thomas C. Marshall, .Akron, Ohio, assignor to Kelly- 

 Springfield Tire Co., Jersey City, New Jersey. United States 

 patent No. 1,179,738.] 



Bead Wire Wrapping Machine. An endless wire hoop is ex- 

 panded to nearly the contour of a circle by a series of concentric 

 pulleys which carry it in a circular path through a rotary shuttle 

 that applies the tape helically on the hoop. [Thomas Midgley, 

 Worthington, Ohio, assignor to Morgan & Wright, Detroit, Mich- 

 igan. United States patent No. 1,179,545.] 



Bead Cleaning Machine. Beads are repeatedly passed 

 through guides having helical grooves which present the different 

 faces of the beads to the buffing wheels that remove the dust and 

 bloom. [Thomas Midgley, Worthington, Ohio, assignor to Mor- 

 gan & Wright, Detroit, Michigan. United States patent No. 

 1,180,310.] 



Butt-Ended Inner Tubes. The two ends to be joined are 

 considerably smaller in diameter than the main tube and a 

 locking ring on the e.xtremity of the male end abuts against an 

 annular thickened extremity on the female end. [Dunlop Rub- 

 ber Co., Limited, 14 Regent street, London, S. W., and Colin 

 Macbeth, Aston, Birmingham, England. British patent No. 

 4693 (1915-).] 



Pneum.\tic Tire Mold and Core. In this type of mold the 

 inner part is closed at the last part of the operation so that the 



R 



te fcA .-- r-^ 



beads can be inspected before the final closing. [F. A. Byrne, 

 2 Ludgate Hill, Birmingham, England. British patent No. 

 94.S4 {1915).] 



MACHINERY PATENTS. 



dipping and drying machine. 

 UBBER articles are made on this machine by successively 

 dipping a form in rubber solution, and drying each coating 

 separately i" the presence of heat and a reduced air pressure 

 of a vacuum. 



This apparatus is shown 

 in side elevation and plan, 

 the enclosed chamber .'] 

 containing the solution at 

 B. The four sprocket 

 wheels C, revolved by a 

 hand crank, drive the two 

 endless chain belts D, that 

 support a series of 

 bars E on which the forms 

 /•■ are mounted. Paddle 

 wheel G acts as an 

 tator for stirring the 

 solution. 



Heat is applied to the 

 upper part of the chamber by steam coils, and in order to main- 

 tain the solution at constant, low temperature cooling coils are 

 provided at the bottom of the solution chamber. Should it be 

 desirable to separate the solution from the upper chamber to 

 prevent overheating and evaporation during the drying operation, 

 a two-part sliding partition is fitted in the tank above the solu- 

 tion. Pipes for solution inlet and outlet and vacuum connections 

 are provided. [Carl S. Williams. New York City, assignor 

 Revere Rubber Co.. a corporation of Rhode Island. Ignited 

 States patent No. 1.180,358.] 



AIR PRESSURE ROLLING MACHINE FOR FOOTWEAR. 



In the manufacture of rubber shoes, it is necessary to assemble 

 the various parts on a last, each component part being hand rolled 

 or "stitched" as it is called, to compact the various layers into a 

 homogeneous article. 

 This hand work requires 

 considerable skill and 

 strength on the part of 

 the operator, all of which 

 is eliminated by this 

 novel machine. 



Referring to the illus- 

 tration, base A supports 

 the bed plate that has a 

 depression B to accom- 

 modate the last to be op- 

 erated upon. An arm C 



pivoted at D is raised and lowered by toggles L, E controlled 

 by the air piston E. The outer part of this arm constitutes a 

 dome-shaped cover G with a bottom flange that cooperates with 

 rings for clamping the rubber diaphragms H and /. The former 

 approximates the upper shape of the last and the latter conforms 

 to the lower part. 



When the cover is raised, the shoe — previously built up on the 

 last without hand rolling — is placed on the lower diaphragm. The 

 cover is then lowered and air or water pressure applied by auto- 

 matically controlled valves /. Thus the air contained within the 

 mold will be forcibly excluded and the diaphragms pressed evenly 

 around the last, firmly compacting the materials of the shoe, 

 which is now ready for vulcanization. [Joseph W. Moore, New- 

 ton Highlands. Massachusetts, assignor to Boston Rubber Shoe 

 Co., Boston, Massachusetts. LTnited States patent No. 1,181,083.] 



