We had this discussion on the old board. I have been trying to identify this logo for years and could never find any connection to a Chicago Hardware forging company. I did find a catalog from a forging company called Cleveland Hardware that shows then logo on the cover (see photo below).
Cleveland Hardware & Forging Co. Inc. was granted a trademark for the logo.
"In 1957, H. K. Porter, a Pittsburgh-based machine tool and heavy equipment builder, purchased Cleveland Hardware and ran it as their Cleveland division until the late 1960s." H. K. Porter is listed as the owner of the trademark by some sources.
One thing keeps me from being 100 percent sure that it is Cleveland Hardware is that all the information I can find classifies them as a forging company and the logo can be found on numerous cast wrenches. They started in the 1870's and might have done castings then.
(http://i222.photobucket.com/albums/dd3/buswrench/message-board/CHLogo-3.jpg)