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US Patent: 250,641
Chain Wrench
Patentee:
William H. Brock - Corona, NY

USPTO Classifications:
81/70

Tool Categories:
wrenches : pipe wrenches : chain and strap wrenches

Assignees:
None

Manufacturer:
William H. Brock - Brooklyn, NY
J. H. Williams & Co. - Brooklyn, NY

Witnesses:
Samuel J. Cohen
Roswell W. Keene
Pierre F. Spencer

Patent Dates:
Applied: Nov. 02, 1881
Granted: Dec. 13, 1881

Patent Pictures:
William H. Brock patented Dec. 13, 1881
USPTO pdf tiff
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Description:
The patent adds the interior lugs on the toothed side plates to the features in Brock's October 4, 1881 patent (no. 247,987). Brock began manufacture of chain tongs in 1882. After selling his early patents to J.H. Williams, he developed a different design which he later manufactured.

Other Brock chain wrench patents include nos. 254,862, 298,442, 366,451, 389,685, 483,419.

Alexander N. Wright - patent attorney

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