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US Patent: 2,489,057
Lever Operated Gripping Tool With Slidable Jaw Face
Patentee:
Ernest J. St. Laurence - Minneapolis, MN

USPTO Classifications:
81/179

Tool Categories:
wrenches : pliers type wrenches : locking pliers
wrenches : wrench components : wrench jaw components

Assignees:
None

Manufacturer:
Whale Tool Corp. - New York, NY

Witnesses:
none listed

Patent Dates:
Applied: Sep. 20, 1945
Granted: Nov. 22, 1949

Patent Pictures:
Ernest J. St. Laurence patent November 22. 1949 -- with two examples of WHALE TOOL CORP. PLI-RENCH
USPTO pdf tiff
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Description:
The special features of this locking pliers are the movable face on the adjustable jaw, and the cross pin on the connecting link to hold the end in the handle.

The specifications note the movable gripping surface in the Seashore patent (no. 2,285,683). Patent nos. 949,557, 1,048,380, and 1,750,817 are also cited as references.

Most known examples marked WHALE TOOL CORP. PLI-RENCH PAT. PEND. A few have the patent number.

There are two variations for the structure of the sliding jaw insert. One variation has a pivot pin and a second pin that acts as a stop, as shown in the drawings for this patent. The more common variation has an elongated loop in the sliding jaw insert and a single pin which acts both to hold the insert and to limit its range of motion.

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