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US Patent: 378,894
Pocket-Rule
Patentee:
Joseph McLean - Rockville, CT

USPTO Classifications:
403/93

Tool Categories:
rules : folding rules : folding rule joints

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Chas. L. Burdett
M. H. Hughes
W. M. Dyorkman
H. R. Williams

Patent Dates:
Applied: Mar. 16, 1887
Granted: Mar. 06, 1888

Patent Pictures:
USPTO pdf tiff
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Description:
This design adds a sprint-activated ratcheting detent to a standard rule joint, allowing it to accurately hold a specific angle.

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