THE INDIA RUBBER WORLD 



[NOVEMRER I. 1915. 



rows of lirailuations can be placed upon the dial, the outer row- 

 reading from C to any capacity desired up to 2,000 pounds. 

 The inner row m;\y be made to read from to any capacity 

 ilesired so that by removing certain weights a more delicate 

 machine is obtained for lighter materials. Thus a machine for 

 tire fabrics may be constructed with a total capacity of 800 

 l)nunds, and by removing part of the weights a macliine i>f 400 

 liounds capacity may l)e had for tapes, braids, etc. 



Attached to the frame of the machine are two stcol ciuadrants, 

 the upper sides of wdiich are provided with machine-cut teeth. 

 ( )n the outer sides of the weight levers are six steel pawls of 

 \arying length which engage the rack teeth and hold the weight 

 levers and dial pointer at the exact position of the break. A 

 third quadrant without teeth is suspended from the frame and 

 passes between the weight levers connecting with a long hand 

 lever on the head end of the machine. 'l"o reset the weight 

 lever and dial hand, it is only necessary for the operator to pull 

 this lever. 



The driving mechanism is enclosed in a heavy iron box sup- 

 l>orted on tJie frame. The main driving shaft extends through 

 this box in a horizontal position ancl is provided at the back with 

 a pair of 10-inch tight and loose pulleys and shipping mechanism 

 to receive a I'.j-inch flat belt. .\ hand-wheel, which may be 

 removed when not in use, is fitted to the front end of this shaft 

 for experimental and research work. 



When it is desirable to drive by motor, a small gear attach- 

 ment is used to replace the tight and loose pulleys, increasing 

 the speed in a ratio of 3 to 1, thus enabling the drive to be 

 ?nade by a single belt direct from a one-quarter H. P. motor 

 lilaced on the floor under the machine. [Henry L. Scott & Co.. 

 Providence, Khode Island.] 



THE NUTTALL FLEXIBLE COUPLING. 



Flexible couplings have almost entirely replaced rigid connec- 

 tions between driving and driven shafts in rubber mill practice, 

 liecause they eliminate the necessity of exact shaft alignment and 

 cushion the shocks of starting and stopping heavy mills and 

 grinders. The Nuttall coupling owes its flexibility to rubber. 



__ .The "Type A" 



coupling shown in 

 the illustration is 

 made up of two 

 cast-iron spiders 

 wMth interlocking 

 arms which are 

 separated by cylin- 

 ders of rubber, 

 held in place by 

 two steel rings 

 that are locked in ihe arms of the spiders. 



Power is transmitted through the rubber cylinders, compres- 

 sing them and obtaining flexibility through their resiliency. 



Its simple construction makes this type more desirable than 

 ordinary couplings and the ease of renewing the rubber cylinders 

 makes the maintenance cost very low. (R. D. Nuttall Co.. Pitts- 

 burgh. Pennsylvania.] 



THE NILSON TILTING WIRE REEL. 



The saving of time and physical exertion in loading coils of 

 heavy wire on reels was the inventor's object in designing the 

 tilting reel. 



The operator trips the lever with his foot and the upper part 

 is gradually lowered until the wire-carrying section is within a 

 few inches of the floor. The guards are removed from the 

 prongs, the coil of wire up-ended and slid upon the carrier. The 

 guards are then replaced and the set screws tightened. When 

 the lever is released the loaded reel is easily returned to its 

 upright position by the operator. It can also be adjusted hori- 

 zontally to feed flat wire. jTlic .\. H. Nilson Machine Co., 

 Bridgeport. Connecticut.] 



PROTECTION OF ALTERNATING CURRENT MOTORS. 



In alternating current motor installations it is common practice 

 to provide means for automatically disconnecting the mi tor from 

 the circuit in the event of sustained overload. It is also usual, 

 except in the 

 case of some 

 small motors 

 which can be 

 thrown direct- 

 ly on the line 

 underload 

 to cut the mo- 

 tor out of cir- 

 cuit when the 

 line voltage 

 drops to a cer- 

 tain predeter- 

 mined percent- 

 age of normal. 



T o provide 



for both overload and iow-\oltage protection of alternating 

 ci;rrent motors up to 2.500 volts and 300 amperes, the General 

 Electric Co., of Schenectady. Xew York, has developed a 

 new relay for use in conjunction with the usual type of G.K. 

 low-voltage release and which is shown in the accompany- 

 ing illustration. 



MACHINERY PATENTS. 



PETER D. IHROPPS PRESS VULCANIZER. 



I 'HE vulcanizer to which this invention is applied, as shown in 

 ■*■ the illustration, is of the well-known vertical type used for 



curing the casings of pneumatic tires. The following descri])- 



tion of the operation of the vulcanizer will explain the novel 



features of this invention. 

 .■\ssuming the chamber i' and pla 



position, the molds are stacked 



on the platen, and the stack is 



compressed against the head plate 



;/ by the ram 6. The auxiliary 



ram // is then put in operation, 



closing the chamber S against the 



head 3, where it is locked by the 



bolts Jj. The steam, introduced 



through the inlet ;j, impinges 



against the circular depression .'/ 



in the plate //, and is forced to 



travel therefrom through the 



grooves 16 and /p to the outer 



portion of the head 3, and hence 



to the outer portion of the cham- 

 ber 8. Upon reaching the outer 



portion, the steam passes down 



around the stack of tires 7. en- 



.gaging the outer portions. When 



it reaches the bottom of the cham- 

 ber S it is permitted to pass up 



through the holes 24 and 2$ in 



the support 33, and thus come in 



contact with the inner portion of 



the stack of tires. Upon reach- 

 ing the top of the vulcanizer it 



will again pass outwardly by way 



of the depression 22 and grooves 2 



time with the outer surfaces of the molds. 



It will be seen that as long as the steam is admitted to the 



vulcanizer it will continue this cycle, thereby following a free 



and uniform circulation, and giving a uniform cure to the tires. 



The grooves 16, which are not in communication with the inlet 



