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US Patent: 583,870
Wrench
Patentee:
Edwin C. Roberts (exact or similar names) - West Pullman, IL

USPTO Classifications:
81/131, 81/77

Tool Categories:
wrenches : wrench adjustment types : quick adjust wrenches

Assignees:
Frederick J. Meyers - Chicago, IL
Edwin C. Roberts - West Pullman, IL

Manufacturer:
Not known to have been produced

Witnesses:
Frederick J. Meyers
Harold G. Barrett
Albert H. Graves
Patent Dates:
Applied: Jun. 26, 1896
Granted: Jun. 01, 1897

Patent Pictures:
Edwin C. Roberts patent June 1, 1897
USPTO (New site tip)
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Report data errors or omissions to steward Stan Schulz
Description:
The two halves of the wrench have parallel ribs and grooves which would provide for adjusting the width of the jaw opening.

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