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US Patent: 6,591,719
Adjustable Pliers Wrench
Self-Locking, Adjustable Pliers Wrench
Patentees:
Daniel L. Poole - Phoenix, AZ
Robert N. Poole - Phoenix, AZ

USPTO Classifications:
81/370, 81/374

Tool Categories:
wrenches : pliers type wrenches : locking pliers

Assignees:
Newell Rubbermaid, Inc. - Rockford, IL

Manufacturer:
C. H. Hanson Company - Naperville, IL

Witnesses:
Unknown

Patent Dates:
Applied: Jul. 19, 2001
Granted: Jul. 15, 2003

Patent Pictures: [ 1 | 2 | 3 ]
Daniel L. and Robert N. Poole patent July 15, 2003
USPTO pdf tiff
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Lock Jaw Pliers web site (Aug. 2009)
Description:
Release lever on the swinging handle; gripping-tension adjusting screw in the intermediate link; base of intermediate link in the solid handle slides on a rod, against a compression spring. Arrangement intended to facilitate one-handed operation with no need to adjust for different size objects. The specifications describe alternate arrangements for some of the features.

In addition to: [Alfred Schulz and Lucile Schulz, Antique and unusual wrenches : Malcolm, NE, 1992], the specifications cite an extensive list of patents as relevant prior art, beginning with 936,980 and including:

HOSTETTER - 2,751,801, 3,116,656, RE26,280

MANSPEAKER - 2,5322,285

MEAD - 2,523,385, 2,543,922, 2,669,145

ROMMEL, et al. - 3,195,382

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