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US Patent: 612,924
Expansion Bit Stock Wrench
Patentee:
Peter S. Grenier (exact or similar names) - Pawtucket, RI

USPTO Classifications:
279/35, 81/115

Tool Categories:
wrenches : brace wrenches
wrenches : socket wrenches

Assignees:
R. W. Lockwood - Providence, RI
Peter S. Grenier - Pawtucket, RI

Manufacturer:
Not known to have been produced

Witnesses:
Richard W. Lockwood
M. E. Cleveland
Benj. Arnold
H. E. Barlow

Patent Dates:
Applied: Mar. 16, 1898
Granted: Oct. 25, 1898

Patent Pictures:
Peter S. Grenier patent October 25, 1898
USPTO (New site tip)
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Description:
Spiral grooves in the outer shell engage pins on the jaw halves to adjust the socket size. A thumb screw in the shell clamps the shell to the base for the jaws to hold the adjustment.

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