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US Patent: 2,700,911
Pipe Wrench With Spring-Biased Hook Jaw
Patentee:
Karol T. Dyczynski (exact or similar names) - Erie, PA

USPTO Classifications:
81/101

Tool Categories:
wrenches : pipe wrenches

Assignees:
Erie Tool Works - Erie, PA

Manufacturer:
Erie Tool Works - Erie, PA

Witnesses:
Unknown

Patent Dates:
Applied: Jun. 30, 1953
Granted: Feb. 01, 1955

Patent Pictures:
Karol T. Dyczynski patent February 1, 1955
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Description:
The spring biases the hook jaw to the open position. The biasing spring is retained in the frame when the adjustable jaw is removed. A couple of alternate means of holding the spring in the frame are presented. The exterior of the wrench resembles the RIDGID (Pat. no. 1,727,623 -- issued Sept. 10, 1929).

The specifications reference patent nos. 509,408 and 2,650,512.

The ERIE PIPEMASTER pipe wrenches have this biasing spring feature.

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