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US Patent: 1,797,730
Socket Attachment for Tools
Edward M. Pfauser - Milwaukee, WI

USPTO Classifications:
403/362, 403/7, 81/177.1

Tool Categories:
wrenches : socket wrenches

Blackhawk Mfg. Co. - Milwaukee, WI

Not known to have been produced

none listed

Patent Dates:
Applied: Sep. 20, 1929
Granted: Mar. 24, 1931

Patent Pictures:
Edward M. Pfauser patent March 12, 1931
USPTO pdf tiff
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Small set screw which would screw out to firmly attach a socket to the shank. The corresponding socket would have a hole to access the set screw.

Some BLACKHAWK Lock-On sockets included exterior set screws as shown in Fig. 3 of this patent, but were designed to fit square drive studs.

Alloy Artifacts does not include this patent in the list of patents related to development of BLACKHAWS's Lock-On line of sockets.

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