NEW MULTICONTACT RELAY 1131 



greater adaptability in new circuit and equipment units than previous 

 multicontact relays. The new relays also require less vertical and hori- 

 zontal space in new equipments. As a result of these improvements, 

 substantial savings are expected when these relays are used. The design 

 includes many features which permit the use of mechanized manufac- 

 turing processes, which, in turn provide better control of tolerances. 

 For these reasons, lower initial costs are expected as manufacturing 

 and assembly methods continue to improve. 



The new 60-contact relaj^s are completely interchangeable with all 

 codes of flat spring multicontact relays in existing crossbar equipments, 

 and in addition, they provide superior performance, longer life and 

 reduced maintenance. Therefore, manufacture of the flat spring multi- 

 contact relays will be discontinued as soon as new relay production 

 becomes adequate for all uses. 



ACKNOWLEDGEMENTS 



Many design problems required the cooperation, special knowledge 

 and facilities of Materials, Chemical and Research Departments of 

 Bell Telephone Laboratories. Some design features, particularly those 

 involving new manufacturing processes, were developed in close co- 

 operation with Western Electric Company engineers. 



These acknowledgements would not be complete without including 

 the technical contributions and assistance of the many people in Switch- 

 ing Apparatus Development Department who were directly and in- 

 directly associated with the project, and to E. G. Walsh and T. H. Guet- 

 tich for their assistance in the preparation of material and illustrations 

 for this paper. 



REFERENCES 



1. G. S. Bishop, Connectors for the No. 5 Crossbar System, Bell Labs. Record, 



28, p. 56, Feb., 1950. 



2. A. O. Adam, The No. 5 Crossbar Marker, Bell Labs. Record, 28, p. 502, Nov. 



1950. 



3. Bruce Freile, Multicontact Relay, Bell Labs. Record, 17, p. 301, May, 1939. 



4. A. C. Keller, A New General Purpose Relay for Telephone Switching Systems, 



B. S. T. J., 31, p. 1023, Nov., 1952. 



5. R. L. Peek, Jr. and H. N. Wagar, Magnetic Design of Relavs, B. S. T. J., 33, 



p. 23, Jan., 1954. 



6. R. L. Peck, Jr., Internal Temperatures of Relay Windings, B. S. T. J., 30, 



p. 141, Jan., 1951. 



7. C. Schneider, Cellulose Acetate Filled Coils, Bell Labs. Record, 29, )). 514, 



Nov., 1951. 

 S. A. J. Brunner, H. E. Cosson and R. W. Strickland, Wire Straightejiing and 



Molding for Wire Spring Relays, B. S. T. J., 33, p. S59, July, 1954. 

 9. A. L. Quinlan, Automatic Contact Welding in Wire Spring Relay Manufacture, 



B. S. T. J., 33, p. 897, July, 1954. 



