152 



HANDBOOK OF MECHANICAL DESIGN 



FLEXIBLE COUPLINGS 



, Shaft ' Hose clamps 



'Rubber hose 

 Fig. 255. — For applications where torque is low and slip- 

 page unimportant. It is easily assembled and disconnected 

 without disturbing either machine element. It is adaptable to 

 changes in longitudinal distance between machines. This 

 coupling absorbs shocks, is not damaged by overloads, does not 

 set up end thrusts, requires no lubrication, and compensates for 

 both angular and offset misalignment. 



Rubber hose ^ ^1* ' Shaft' 

 ^ Shaft ^Washer 



Fig. 256. — Positive drive is assured by 

 bolting hose to shafts. This has the same 

 advantages as the type in Fig. 255, except 

 there is no ova load protection other than 

 the rupture of the hose. 



<//o/e 



Coiled spring - n Hole , 



'Shaft Shaft- 



Fig. 257. — This type has excellent shock-absorbing 

 qualities, but torsional vibrations are possible. It will allow 

 end play in shafts, but sets up end thrust in so doing. Other 

 advantages are the same as for the types shown in Figs. 255 and 

 256. This type compensates for misalignment in any direction. 



( Sef screws. 



Coupling 



^ Couplinq 



Shaff- 



She 



Fig. 258. — Coupling for low torques and unidirectional 

 rotation. Inertia of rotating parts is low. This type is easUy 

 assembled and disconnected without disturbing either shaft. 

 The cable can be encased and the length extended to allow for 

 right-angle bends such as are used on dental drills and speedom- 

 eter drives. The ends of the cable are soldered or bound with 

 wire to prevent unraveling. 



/ Hubs > 



Cover' 



Fig. 259. — A type of Falk coupling that operates on the same principle as design shown in Fig. 260, but has a 

 single fiat spring in place of a series of coiled springs. A high degree of flexibility is obtained by use of tapered slots in 

 hubs. Smooth operation is maintained by enclosing the working parts and packing with grease. 



