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US Patent: 1,568,934
William C. Tull - Stanton, NE
Roy J. Bristol - Stanton, NE

USPTO Classifications:
81/111, 81/163, 81/378, 81/398, 81/DIG.3

Tool Categories:
wrenches : pliers type wrenches : locking pliers

Vera Birdinger - Norfolk, NE
Joseph Lampe - Norfolk, NE
Gordon R. Butterfield - Norfolk, NE
George H. Tatge - Norfolk, NE

Griplock Plier Wrench Co. - Norfolk, NE


Patent Dates:
Applied: Feb. 15, 1924
Granted: Jan. 05, 1926

Patent Pictures: [ 1 | 2 ]
Tull and Bristol Pat. Jan. 5. 1926
USPTO pdf tiff
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The adjustment is accomplished by a turnbuckle which changes the length of the connecting link. The unusual feature is the sliding pivot "arm" on the movable jaw. Produced as the "Griplock Plier Wrench" at Norfolk, Nebraska in "long nose" and "blunt nose" versions.

The turnbuckle connector bore a lot of strain in this design, and surviving examples frequently show damage or repair in this area. When the company failed a stock of parts was left behind. A regional antique dealer later acquired the parts and assembled wrenches using roll pins rather than solid rivets.

The 1924 patent date stamped on the tool possibly refers to Tull & Bristol's earlier patent (no. 1,504,401), although the date does not correspond.

The turnbuckle type size adjustment in this patent is cited in later patents, most notably the Lawrence C. Mead patents used for the GRIPSO VISE PLIERS (pat. nos. 2,519,973, 2,523,385, and 2,543,922).

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