POWER TRANSMISSION ELEMENTS AND MECHANISMS 155 



Flexible disks ^ 



\ Laminafed mefal disks^ 



Fig. 269. — A coupling made by Aldricb 

 Pump Company, similar to Fig. 268, except 

 that bolts are used instead of pins. This 

 coupling permits only slight endwise movement 

 of the shaft and allows machines to be tem- 

 porarily disconnected without disturbing the 

 flanges. Driving and driven members are 

 flanged for protection against projecting bolts. 



Cenlerdisk-''' 

 Fig. 270. — ^Laminated metal disks are used in this coupling 

 made hy Thomas Flexible Coupling Company. The disks are 

 bolted to each flange and connected to each other by means of 

 pins supported by a steel center disk. The spring action of the 

 center ring allows torsional flexibility, and the two side rings 

 compensate for angular and offset misalignment. This type 

 of coupling provides a positive drive in either direction without 

 setting up backlash. No lubrication is required. 



r^f^ ^' Lea I her disk - 



i-;\ Secfion A-A 



Fig. 271. — A design made by Palmer-Bee Company for 

 heavy torques. Each flange carries two studs, upon which are 

 mounted square metal blocks. The blocks slide in the slots 

 of the center metal disk. 



•^ Section A-A 



Fig. 273.— The principle of the T. B. Wood k 

 Sons Company coupling is the same as Fig. 272. 

 but the driving lugs are cast integrally with the 

 metal flanges. The laminated leather disk is 

 punched out to accommodate the metal driving 

 lugs of each flange. This coupling has flexi- 

 bility in all directions and does not require 

 lubrication. 



,/ Rivet members 



Cast- iron 

 hiub ~- 



Leaiher -' 

 disk 



Fig. 272. — In this Charles Bond Company coupling, a 

 leather disk floats between two identical flanges. Drive 

 is through four laminated leather lugs cemented and 

 riveted to the leather disk. This type compensates for 

 misalignment in all directions, and sets up no end 

 thrusts. The flanges are made of cast iron. Driving 

 lug slots are cored. 



Leaf her 



Fig. 274. — Another design made by Charles Bond 

 Company. The flanges have square recesses into 

 which a built-up leather cube fits. Endwise move- 

 ment is prevented by through bolts used where low 

 torque loads are to be transmitted. 



