US Patent: 115,450 - Improvement in tackle-blocks


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US Patent: 115,450

Improvement in tackle-blocks

Patentee:

Ellis Doty (exact or similar names) - Janesville, WI

USPTO Classifications:

254/399, 254/401

Tool Categories:

industrial tools : pulley blocks and tackles

Assignees:

None

Manufacturer:

Doty Mfg. Co. - Janesville, WI

Witnesses:

F. B. Curtis

D. D. Kane

Patent Dates:
Granted:	May 30, 1871

Patent Pictures:

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Description:

The pulleys are sized so that every pulley within the block rotates at the same speed, which reduces friction. The center pulley has an extended axle on which the outer pulleys ride.