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US Patent: 3,190,154
Adjustable End Wrench with Locking Means
William C. Chapman - Brighton, MI

USPTO Classifications:
81/165, 81/315, 81/370, 81/373, 81/384

Tool Categories:
wrenches : wrench adjustment types : screw adjust wrenches
wrenches : wrench components : wrench adjustment locks


Chapman Tool Corp. - Haslett, MI

none listed

Patent Dates:
Applied: Nov. 13, 1963
Granted: Jun. 22, 1965

Patent Pictures: [ 1 | 2 | 3 ]
William C. Chapman patent June 22, 1965
USPTO pdf tiff
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The side lever applies end pressure to the spring-loaded adjusting knurl and movable jaw through an intermediate link. The wrench as produced does not include the tension adjustment screw or release lever shown in the patent.

The patent number appears on the lever handle.

Edward M. Apple - patent attorney

The third image shows a CHAPMAN TIGER-LOCK adjustable end wrench with lever lock in conjunction with a CHAPMAN TIGER-CLAW chain pipe wrench adapter based on patent number 3,613,486.

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