August 1. 1917.] 



THE INDIA RUBBER WORLD 



651 



New Machines and Appliances. 



MACHUTE FOR STAMPING NUMBERS ON METAL. 



THE difficulty of obtaining meta! specialties of various sorts, 

 due to the congestion of orders in the metal industry, has 

 been a serious handicap to many rubber mills. When the 



necessity is urgent 

 the manufacturers 

 have been forced 

 to supply their own 

 requirements that 

 were formerly ob- 

 tained from mak- 

 ers of metal spe- 

 cialties. 



.As a case in 

 p o i n t. the thin 

 strip of tin or 

 ahuninum that i^ 

 numbered consecu- 

 tively and used in 

 the molds for re- 

 producing the 

 number of the tire, 

 may be made by 

 the machine here 

 shown. It is con- 

 structed on the 

 same lines as a 

 sub-press and is 

 used in connection 

 with an ordinary 

 power punch press. This machine will automatically emboss 

 consecutive numbers on thin, soft metal, either on separate pieces 

 or from a roll. 



The numbering wheels are constructed on the principle of 

 male and female dies and as the strip is automatically fed be- 

 tween them a raised number is formed on the metal at each 

 stroke of the press. The numbering heads may also be con- 

 structed with any number of wheels and a letter wheel to follow 

 or precede the number is supplied if so desired. Moreover, 

 the machine can be constructed to duplicate or triplicate each 

 number. [Wetter Numbering Machine Co., 255-61 Classon ave- 

 nue, Brooklyn. New York.] 



THE DOUBLE CONE VISE COUPLING. 



The old-fashioned flange coupling is now seldom used, as it 

 requires particular fitting to its individual shaft, must be tightly 

 forced in place permanently and cannot be used on shafts in 

 connection with other than split pulleys or open hangers. The 

 modern type of compression coupling that possesses none of 

 these objectionable features is here shown and has been specially 

 designed to meet the particular requirements of ruliber mill 

 practice. 



There are three principal parts — the outer sleeve or shell and 

 two inner bushings or cones. The shell has its interior sur- 

 faces bored like the frustrums of two cones, having one con- 

 tinued axis. Into these are fitted the two cones, which have 

 been previously bored of standard size to suit the shafts. When 

 in place the a.xes of the cones must be coincident with that of 

 the shell, thus under all conditions keeping the two shafts that 

 are connected in true axial line, an exclusive feature of this 

 coupling. The inner ends of the cones do not come together, 

 their relative position being regulated by their external contact 

 with the inner surface of the shell and their internal pressure 

 upon the shafts to be coupled. 



The shells have three equidistant longitudinal slots in their 

 inner surface, while the cones have corresponding slots in their 

 outer surface, through the bottom of which there is cut a 

 narrow additional slot, which extends through to the bore, thus 



parting the cone on this side. Into these main slots are pocketed 

 the bolts, which serve alike to draw the cones toward each 

 other and to prevent their turning in place. 



The attachment and operation are readily understood. When 

 the various parts have been placed — by hand — in proper posi- 

 tion on the shafts, the bolts are inserted and gradually tightened. 

 This screwing of the bolts exerts an equal pressure upon both 

 cones, and as they are drawn along the inclined walls of the 

 shells they are compressed, and exert a vise-like grip upon the 

 entire circumference of the shafts to be coupled. As a slight 

 drawing of the cone within the shell will make a perceptible 

 compression of its diameter, and a subsequent contraction of its 

 bore, it is evident that the shafts do not require to be fitted to 

 the couplings, and that variation in the exact sizes of the shafts 

 does not distort their true alinement. 



When the cones or their key seats become worn, the sub- 

 stitution of new cones renders the coupling practicrilly new in- 

 every respect. [William Sellers Co., Inc., Philadelphia, Pennsyl- 

 vania.] 



ACID PROOF VALVES. 



In the early days of the rubber reclaiming industry porcelain 

 cocks were used on the acid lines in place of valves. These be- 

 ing exceedingly fragile it was necessary to provide some sort of 

 covering to pro- 

 tect the porccLiin 

 against .breakage. Therefore, 

 they were enclosed in a lead 

 casing and melted sulphur was 

 poured into the space between 

 the lead envelope and the por- 

 celain cock to strengthen 

 them. These valves gave 

 satisfaction for some time, but 

 were found to be still too 

 fragile, as the plug was often 

 fractured, in which case both 

 plug and seat had to be re- 

 placed at considerable expense. 



A trial was then made with the regular type of cast iron cock. 

 This proved to be satisfactory for a while, but eventually the 

 plug became stuck or "frozen" in the valve body owing to the 

 corrosive action of the acids. 



Valves that comprised a metal body lined with special acid- 



