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US Patent: 741,394
Wrench
Wrenches For Grasping Pipes, Rods or Nuts
Patentee:
John Bystrom - Chicago, IL

USPTO Classifications:
81/90.2

Tool Categories:
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
None

Manufacturer:
Norwall Mfg. Co. - Chicago, IL

Witnesses:
Geo. L. Chindahl
G. A. Fauberschmidt

Patent Dates:
Applied: Dec. 03, 1902
Granted: Oct. 13, 1903

Patent Pictures: [ 1 | 2 ]
John Bystrom patent October 13, 1903
USPTO pdf tiff
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Description:
A cam-action extension on the handle operates a movable jaw in relation to the fixed jaw. Two alternate jaw forms are shown. Both forms appear with the marking "ALLEN WRENCH / PAT APPLD." The simpler "alligator wrench" form is nominal 8 inch; the "hook jaw" form is nominal 18 inch; a 1903 trade announcement listed three sizes (8 inch, 14 inch and 24 inch.)

Norwall Mfg. produced steam related products with the "ALLEN" brand name.

Corresponding British patent GB-190322699 was registered Oct. 20, 1903.

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