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Manufactured By:
Stilwell-Bierce & Smith-Vaile Co.
Dayton, OH

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Title: 1891 Article-Stilwell & Bierce Mfg. Co., Rice Patent Friction Clutch
Source: American Engineer, V21, 07 Feb, 1891, pg. 52
Insert Date: 7/28/2019 11:42:25 AM

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The friction clutch pulley, herewith illustrated, was invented by A. C. Rice, superintendent of the extensive works of Stilwell & Bierce Manufacturing Co., Dayton, Ohio. His wide practical experience and high standing in his profession will commend his invention to the careful consideration of all who have occasion to use friction clutch pulleys and couplings.

The engravings represent one of Rice’s friction clutch pulleys in perspective, attached to a shaft and thrown in gear. The clutch is shifted in and out by means of an upright shaft terminating in a pinion, which engages in a rack cut in the side of the shifter sleeve extension; this shaft is provided with a hand wheel and may be extended so as to operate the clutch from any floor above or below. The ordinary shifter fork and lever can be used and will be provided if preferred. The clutch is provided with four metal friction shoes, which are simultaneously operated by the four crooked shifter arms. Each of these shifter arms is fulcrumed on an eccentric bolt, the end of which only is seen. The center of each friction shoe is out of center with its corresponding eccentric bolt, the effect of which is, when the friction shoe is thrown out against the friction rim, the shoe acts as a wedge increasing the friction of the two surfaces, just in proportion as the load is increased, thus effectually preventing all slip. Each shifter arm is provided with an antifriction roll running in the inclined slots in the shifter sleeve which makes it easy to operate. These inclined slots terminate at both ends in straight slots parallel with the shaft, which serve to lock the shifter arms and prevent all friction whatever on the shifter sleeve caused by centrifugal force when running, and consequently all tendency to throw in or out.

This clutch is positive in action; very powerful in grip; perfectly balanced; does not throw out oil when running; is entirely free from clap trap attachments and will be found durable and highly satisfactory in operation.

U. S. patent #456,909.

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1891 Stilwell & Bierce Mfg. Co., Rice Patent Friction Clutch
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