US Patent: 1,371,491


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Wrench

Patentee:

David Clinton Kerr (exact or similar names) - Flint, MI

USPTO Classifications:

81/185

Tool Categories:

wrenches : wrench components : wrench jaw components

Assignees:

None

Manufacturer:

David Clinton Kerr - Flint, MI

Witnesses:

Unknown

Patent Dates:
Applied:	May 19, 1920
Granted:	Mar. 15, 1921

Patent Pictures: [ 1 | 2 ]

David Clinton Kerr patent March 15, 1921

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Description:

Auxiliary jaw insert on a spring extension, to provide multiple sizes on a single double open end wrench. Known examples may have single or double sets of these auxiliary inserts, but do not have the screwdriver blade shown in the drawings.