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US Patent: 1,902,878
Ratchet wrench
Edward Henry Peterson - Chicago, IL
Norris F. McNaught - Chicago, IL

USPTO Classifications:
29/434, 29/437, 29/441.1, 29/511, 29/520, 76/114, 81/61

Tool Categories:
wrenches : ratchet wrenches

Duro Metal Products Co. - Chicago, IL

Duro Metal Products Co. - Chicago, IL

none listed

Patent Dates:
Applied: Jun. 16, 1932
Granted: Mar. 28, 1933

Reissue Information:
Reissued as RE19,341 (Oct. 16, 1934)

Patent Pictures: [ 1 | 2 ]
Norris F. McNaught & Edward H. Peterson patent March 28, 1933
USPTO pdf tiff
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DURO-INDESTRO (Alloy Artifacts)
The main feature of this patent is the method of assembly. The component parts of the ratchet mechanism are inserted in the wrench body and after the side plates are in place, the assembly is compressed with double dies which fold the edges of the recess over the side plates and lock all the parts together without rivets or screws. One of the side plates has a hole to oil the interior mechanism.

The set in the 2nd photo is a DURO-CHROME No. 4490 refrigeration wrench including sockets with integral 1/4" studs to fit the 1/4" square drive in the ratchet head.

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