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US Patent: 618,506
Joseph H. Hanson - Crystal Falls, MI

USPTO Classifications:
81/142, 81/68

Tool Categories:
wrenches : wrench adjustment types : quick adjust wrenches

Joseph H. Hanson - Crystal Falls, MI
Sherman T. Handy - Crystal Falls, MI
A. M. Darling - Crystal Falls, MI
D. R. Brown - Mills Centre, WI

Not known to have been produced

H. G. Dieterich
E. McCormic
S. T. Handy
John Tromblay

Patent Dates:
Applied: Apr. 21, 1897
Granted: Jan. 31, 1899

Patent Pictures:
Joseph H. Hanson patent January 31, 1899
USPTO pdf tiff
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The patented feature is adjustment by a rack bar held in engagement with rack teeth by a ball or balls. The ball or balls can be retracted by turning sockets in a parallel "bolt" toward the rack bar.

The adjustment means is shown applied to a combination nut & pipe "monkey wrench," to an adjustable chain wrench, and to an adjustable open end wrench.

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