332 



THE INDIA RUBBER WORLD 



| March 1. 1915. 



(11) adapted to be rigidly clamped to the 



the shaft (2) is provided 



itli 



i lock working over a toothed quadranl ill) to secure the 

 cutters in tlu required position relative to the roll (3). !J. 

 Rushmer, British patent. No 22,008.] 



A GERMAN BEAD TRIMMER. 



A I Rl INT view of the machine is shown in the illustration. 

 On shaft a are the cutting discs b. These engage chan- 

 nels c of drum </. which has additional channels for receiving 

 the beads. Drum d \< keyed to shaft f, which is driven by belt 



AA 



pulley g. Shaft a is driven from shaft / by gears h. Grooves k 

 in drum d feed the tire to the cutting discs. The cutting discs 

 b are adjusted by hand screws m. [O. Meir. German patent. 

 D. R. P., No. 280,897.] 



THE FRANCKE FLEXIBLE COUPLING. 



""PHIS is simply an ordinary flange coupling connected by 



flexible instead of rigid bolts. The flexible pins are made 



i tempered steel leaves, held at each end by a keeper, which 



which also lit in a groove in the coupling flanges. They hold 

 the leaves in a radial position for driving, and also hold tin- 

 keepers stationary in the coupling flanges. 



All the leaves except two short ones at each end are slotted. 

 The short ones are held stationary, making all movement come 

 on the tempered steel leaves. The slotted leaves, of which 

 there are hundreds, do the driving and distribute the work over 

 a large area of hardened steel. The slots allow the coupling 

 to adapt itself to any misalignment. When running, the leaves- 

 act similarly to the leaves of a carriage spring and with equal 

 reliability and certainty of long wear [The Smith-Serrell Co., 

 ! m . New N ork.] 



A NEW RUBBER TESTING MACHINE. 



prevents their getting loose or lost, and makes of each pin a 

 flxible bolt. 



The keepers are slotted at each end to engage spring rings. 



THIS machine is built according to United States standards 

 and on the dead weight principle. Two heavy iron frames 

 support the machine, which is about 7 feet long. It is attached 

 to the wall to avoid floor vibration and is driven by a 1/6-horse- 

 power motor. 



The bead of the machine has a dial with two rows of figures. 

 The outer graduations range from to 

 250 pounds, by pounds, and the inner 

 from to 50, by fifths of pounds. One 

 hand indicates on both circles the 

 amount of stress required to 

 break the sample. On the 

 swinging lever are two weights, 

 the upper being fixed and the 

 lower removable. Delicate 

 tests are made by removing 

 the lower weight and reading the in- 

 side row of graduations on the dial. 



The test is started by means of the 

 lever at the left, which causes the 

 stretching screw to move downward at 

 a definite speed without revolving. At 

 the end of the stroke the tester auto- 

 matically reverses and returns at high 

 speed to its normal position, where it 

 comes to rest ready to receive another 

 sample. The pointer on the dial re- 

 cords the amount of the break and re- 

 mains at that point until reset. If de- 

 sired, the locking pawls may be held 

 out of engagement with the toothed 

 racks and an oscillating movement ob- 

 tained for friction tests. 



To indicate the stretch a brass scale 

 graduated from to 48 inches, is at- 

 tached to the frame at the left. The 

 scale is adjusted up to bring the mark 

 to any desired point. Upon the scale 

 are place two sliding pointers, which 

 arc easilj moved by hand to follow marks upon the sample. 

 To the lower pointer is attached a special flexible tape in a 

 round metal case which automatically winds and unwinds as 

 the distance between the pointers varies. This tape gives the 

 net stretch between any two marks on the sample. Near the 

 tape at the left is an automatic registering or charting device 

 designed to hold a standard size letterhead on a flat platen by- 

 means of two rubber covered rolls. The break and stretch is 

 recorded in ink on this sheet, which is then placed in a type- 

 writer to receive further data for record. Several tests may be 

 recorded on the same sheet to demonstrate variation in differ- 

 ent samples. The movements of this recording mechanism are 

 automatically begun when the starting lever of the machine is 

 operated and automatically stopped when the machine is re- 

 versed. (Henry L. Scott & Co., Providence, R. I.) 



