US Patent: 526,007 - Hoisting-drum


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US Patent: 526,007

Hoisting-drum

Patentee:

Henry Bolthoff (exact or similar names) - Denver, CO

USPTO Classifications:

188/218R, 188/382

Tool Categories:

material handling : industrial elevators and lifts

specialty machines : mining apparatus

Assignees:

None

Manufacturer:

Hendrie & Bolthoff Manufacturing & Supply CO. - Denver, CO

Witnesses:

I. M. Sale

Brinton Gregory

Patent Dates:
Applied:	May 31, 1893
Granted:	Sep. 11, 1894

Patent Pictures:

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Vintage Machinery entry for Hendrie & Bolthoff Mfg. & Supply Co.

Description:

Seen in an 1898 Hendrie & Bolthoff catalog, "Our Double Cylinder Quadruple Friction Hoist. The fixtures comprise steam pipes as shown in cut, patent balanced throttle valve, oil cups, nickel-plated double sight-feed lubricator, oil cans, set steel forged wrenches and foundation bolt ends."