

THE INDIA RUBBER WORLD 



I \i GUST 1, 1915. 



HOLLOW BALL MOLD AND PRESS. 



[nfl; foi min^ the sections / ( see I i 



3) in a n iwn in Fig. 2. This consists of a lower and 



an up] i id ly, the latter having an annular 



ich forms a 



FIC.6 



flange .- with a thin outer 



ded section 



sections arc then 



placed in the mold cavities •/ 



the ci imbined 



mold and i which is 



enclosed in a . 



The press and mold con 

 sist of upper and lower dies 

 aligm d bj di >w el pii 1 es 1 1 

 and openi cl ised by a 



has a square 

 head 'i and is turned by the 

 spindle to that passes through 

 the o". er •.- of the chamber 

 i p ed .ur is forced 

 into the chamber through pipe 33, the molds are closed and steam 

 applied until the halls are vulcanized. 



Fig I iws a modification in which the upper mold section is 

 supported upon springs 51 and the molds are forced together by 

 a vertical shaft 52 operated by a lever 56 and a counterweight. 

 [R. II. Rosenfeld and F. T. Roberts, Trenton. New Terse; 

 British patent No. 4,623, 1914.] 



MACHINE FOR PUNCHING NIPPLES. 



The object of tins invention is to provide a machine for punch- 

 ing the central holes in nipples, of any size that may be re- 

 quired, in a rapid and uniform manner. 



The base .! rests on a suitable bench or table and carries the 

 three standards B that support the operative parts of the machine. 



The nipples to be punched arc placed on the thimbles C arranged 

 in a circle 011 .1 head /' that revolves on the upright spindle E. 

 The head i^ turned intermittently by the horizontal ratchet- 

 ind pawl attached to a slide reciprocated by the con- 

 necting rod G driven by the disc crank H upon the driving shaft 

 /. The nipples on the thimbles are punched by the punch I, 

 carrie I V which extends down through the base and is 



rmally by the spring L. The punch rod is forced down 

 intermittently by the pivoted lever .1/ which is operated by the 

 V, and the punching 1- done by the action of the spring. 



The punch block is revolved by worm gearing that is moved 

 intermittently by a pawl P. The levers Q and R are connected 

 lo this pawl and are driven from the main shaft / by the crank 

 arm .V. A.S the head D rotates the hook-shaped lever T removes 

 the punched nipple from the thimble. The size of the holes is 

 regulated by raising and lowering the stretcher plate interposed 

 between the punch / and the punch block (>. [Jeremiah L. Ma- 

 honey, United States patent No. 1,144.045.] 



MACHINE FOR MAKING TUBULAR CORD. 



Tew's machine twists the strands of yarn into a hollow cord 

 and at the same time impregnates them with rubber solution. 

 This not only cements the Strands together but insulates them 

 and prevents the wearing of one against the other. 



Referring to the illus- 

 tration, which is a side 

 elevation, A is the frame 

 of the machine and B the 

 uprights that support the 

 bobbins C. The strands 

 D are led over guide rol- 

 lers I- mounted in the top 

 frame which is sup- 

 ported by the standards 

 F. The strands then pass 

 down through the station- 

 ary casing G, in wdiich 

 they are impregnated 

 with rubber solution sup- 

 plied through pipe H. 



Within the casing the 

 strands converge about a 

 conical former and pass 

 through a tubular die that 

 acts as a guide for the 

 cord /. The completed 

 cord then passes through 

 the hollow journal of the 

 frame and around guide 

 pulleys / and K to the 

 bobbin /.. When the 

 frame M is rotated by 

 bevel gearing connected 

 to the driving shaft N, the 

 strands are twisted into a tubular cord, which is drawn down 

 and wound up on the traveling bobbin. [J. D. Tew. British 

 patent No. 12630-1914.] 



WASTE RUBBER HEEL MOLD. 



The object of this invention is to provide a mold by which a 

 heel can be made from vulcanized rubber waste without risk of 

 the mold bursting and without any "spew" on the edges. 



Ibe mold is made of steel, in three parts, as shown in the il- 

 lustration: A base .-), which is in the form of a plate; a cen- 

 777 



tral part B, which is raised and forms the bottom face of the 

 mold, and a ring C, which forms the vertical wall of the mold. 



The ring C at its base fits concentrically around the part B 

 and receives a ram or plunger. D, which has a close piston-like 

 fit and is designed to slide within the ring C. 



The central raised part of the plate is suitably engraved with 

 the brand or name which the finished heel is tQ^carry. 



