POWER TRANSMISSION ELEMENTS AND MECHANISMS 



157 



Floaiing 

 disk 



Leaf her 

 sfar 



Fig. 281. Fig. 282. 



Fig. 281. — The Oldham form of couphng made by 

 W. A. Jones Foundry and Machine Company is of the 

 two-jaw type with a metal disk. Is used for trans- 

 mitting heavy loads at low speed. 



Fig. 282. — The Charles Bond Company star 

 coupling is similar to the cross type shown in Fig. 275. 

 The star-shaped floating member is made of laminated 

 leather. It has three jaws in each flange. Torque 

 capacity is thus increased over the two-jaw or cross 

 type. The couphng takes limited end play. 



Sec+ion X-X 



Fig. 284. Fig. 285. 



Fig. 284. — A metal block as a floating center is used in 

 this American Flexible Coupling Company design. 

 Quiet operation is secured by facing the block with 

 removable fiber strips and packing the center with 

 grease. The coupling sets up no end thrusts, is easy to 

 assemble, and does not depend on flexible material for the 

 driving action. It can be built in small sizes by using 

 hardwood block without facings for the floating member. 



Fig. 285. — This Westinghouse Nuttall Company 

 coupling is an all-metal type having excellent torsional 

 flexibility. The eight compression springs compensate 

 for angular and offset misalignment. This type allows 

 for some free endwise float of the shafts. It will transmit 

 high torques in either direction. No lubrication is 

 needed. 



, Rubberized 

 I fabric disks' 



'■" Flexible disk 



Fig. 283. — A combination rubber and canvas disk 

 is bolted to two metal spiders. Extensively used for 

 low torques where compensation for only slight 

 angular misalignment is required. It is quiet in 

 operation and needs no lubrication or other attention. 

 Offset misalignment shortens disk life. 



Fig. 286.— Similar to Fig. 283, but wOl withstand offset 

 misahgnment by addition of the extra disks. The center 

 spider is free to float. By use of two rubber-canvas 

 disks, as shown, the coupling wiU withstand a consider- 

 able angular misalignment. 



