US Patent: 76,328 - Improvement in friction-clutch


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US Patent: 76,328

Improvement in friction-clutch

Patentees:

James B. Johnson (exact or similar names) - San Francisco, CA

William H. Birch (exact or similar names) - San Francisco, CA

USPTO Classifications:

192/44, 192/45.017

Tool Categories:

material handling : hoists, winches, come-alongs

industrial machines : industrial machine mechanisms : industrial machine clutches

Assignees:

None

Manufacturer:

Gracier & Johnson - San Francisco, CA

Francis J. Gracier - San Francisco, CA

Witnesses:

J. L. Boone

George H. Strong

Patent Dates:
Granted:	Apr. 07, 1868

Patent Pictures:

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Vintage Machinery entry for Gracier & Johnson

Description:

"The object of our invention is to provide an improved clutch, to be used upon hoisting-apparatus, pulleys, ratchet-drills, or in any place where a free motion about the axle is desired in one direction, while it is desirable to have the whole mechanism move together in the other..."

J. B. Johnson of San Francisco won a First—Diploma for his "patent friction hoist" at the 1868 Fair of the (California) State Agricultural Society.