158 



HANDBOOK OF MECHANICAL DESIGN 



Siee/ sfr/ps - 

 - - Spiders ,- - - ; 



3- piece sleeve 



'-^A Section k'k 



Fig. 287. — In this Smith & Serrell coupling, a 

 flexible cross made of laminated-steel strips floats 

 between two spiders. The laminated spokes, retained 

 by four segmental shoes, engage lugs integral with the 

 flanges. This coupling is intended for light loads 

 only. 



^Spring regaining pin 



Fig. 288. — This coupling, made by Brown Engineering 

 Company, is useful for improvising connections between 

 apparatus in laboratories and similar temporary installa- 

 tions. It compensates for misalignment in all directions. 

 It will absorb varying degrees of torsional shocks by 

 changing the size of the springs. Springs are retained 

 by threaded pins engaging the coils. Overload protec- 

 tion is possible by the slippage or breakage of replaceable 

 springs. 



Mm 



z 



1 .. 



^s 



m 



Laminafed' 

 spoices 



Fig. 289. — In another design by Brown Engineering 

 Company, a.series of laminated spokes transmit power 

 between the two flanges without setting up end 

 thrusts. This type allows free end play. Other 

 advantages are the absorption of torsional shocks, no 

 exposed moving parts, and good balance at all speeds. 

 Wearing parts are replaceable and working parts are 

 protected from dust. 



Compres- 

 sion sleeve 



Fig. 290. Fig. 291. 



Fig. 290. — In this coupling of Falls Clutch & 

 Machinery Company, two hubs with triangular heads 

 and a three-piece sleeve are used. The sleeve is 

 bolted together when assembling. Three pieces of 

 compression lining provide the necessary flexibility. 

 Misalignment is compensated for in all directions by 

 compression of the linings.. 



Fig. 291. — This Medart Company flexible coupling 

 uses square keys or pins of fiber, Textolite, or other 

 flexible material which engage V slots. Clearance is 

 provided in the V slots for flexibility. The pins are 

 held in place by a retaining collar. Coupling can 

 float endwise. 



Oil /eve I when^ 

 nol in molion 

 ^Oil reservoir holes 

 Fig. 292. — In the design of the W. H. Nicholson & 

 Company flexible coupling, a series of floating steel keys 

 shde in dovetail slots cut into each flange. The degree of 

 misalignment compensated for depends on the clearance 

 between the keys and slots. Wear is reduced, and 

 cushioning is provided by operating keys in oil bath. 

 Keys act noiselessly, centrifugal force keeping them 

 against the slot surfaces. 



