The type B motor was the second type of motor that Warren Clock Company put into production. While it has more gears than the type A motor, it is more compact, has a design that allowed the lubrication to remain intact for years, and probably proved more economical to manufacture. Like the type A, type B motors for 60 cycle use have an internal rotor spinning at 3600 revolutions per minute. A gear train reduces the speed, and the output shaft rotates at 1 revolution per minute.
Instead of the two worm gears of the type A motor, a series of gear/pinion assemblies act as the speed reduction train.
Patents for the type B motor were applied for on September 1, 1920, and the motor was probably put into production at that time or earlier. Some of the type B rotors have a date stamped on them (digits for the month and year). The earliest date stamp observed so far is 1929, and the latest is a silver color M-60 rotor dated 1 33 (January 1933).
United States Patent 1,430,867
Application filed September 1, 1920
Patented October 3, 1922
The drawing in the above patent is not exactly like a type B motor, but it covers the basic idea. Some simplifications were made to create a motor which could easily be mass produced.
Pictures of a Telechron type B rotor and field unit. This rotor is in a brass housing and is dated 7 30 (July, 1930). The type B rotor was also made with copper housings and silver color housings, and the newest ones have aluminum housings.
The one shown here is type B-2, having a hollow shaft with a pinion, and was used on time-only clocks in the 1920's and early 1930's.
Next: Telechron type F and H motors.