US Patent: 803,397 - Pipe Wrench and Shifting Spanner


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US Patent: 803,397

Pipe Wrench and Shifting Spanner

Patentee:

Richard Michael Carroll (exact or similar names) - Petone, Wellington New Zealand

USPTO Classifications:

81/409.5

Tool Categories:

wrenches : pipe wrenches

wrenches : pliers type wrenches

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

E. P. O'Donnell

K. Wilson

Patent Dates:
Applied:	Jun. 29, 1905
Granted:	Oct. 31, 1905

Patent Pictures:

Richard Michael Carroll Pat. Oct. 31, 1905

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Description:

The adjustment mechanism is racks of fine teeth held in engagement by a spring within the "hollow" handle. A button on the side operates a slide which releases the engagement of the rack teeth. The wrench falls in the category some call "pipe grips."