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US Patent: 252,028
Flexible gearing
Alonzo S. Gear - New York, NY

USPTO Classifications:
474/148, 474/153, 74/462

Tool Categories:
industrial machines : industrial machine mechanisms : industrial machine gearing

Perpetual Tension Propelling Belt Co. - New York, NY

Not known to have been produced

George P. Avery
John R. Manley

Patent Dates:
Applied: Jan. 28, 1881
Granted: Jan. 10, 1882

Patent Pictures:
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"Vintage Machinery" entry for A. S. & J. Gear & Co.
This spring drive belt was indeed manufactured by the assignee, who claimed, a few months after this patent was issued, that they had already sold 300,000 of them. But the company disappeared from sight within a few more months.

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