Posted by bc on January 18, 2021 at 20:39:49 from (24.255.129.137):
In Reply to: Cheap screw drivers posted by svcummins on January 18, 2021 at 19:25:12:
Quoting Removed, click Modern View to see
The problem originated in Canada. Peter Roberston of Robertson Screw Co. invented it based upon a British design and patented it in Canada in 1907. It was used at Henry Ford's Windsor, Ontario auto plants. Ford wanted to use it at his American plants but Robertson was stubborn and he refused. Then John Thompson redesigned it and got an American patent in 1933 and 1934. He couldn't get anyone to use it so he sold it to Henry Phillips in 1935 who redesigned Thompson's and got a new American patent. In 1936 Phillips got General Motors and everyone else to use it in the US. So then we end up with differing designs being used with the Phillips in America and the Robertson screw in Canada and also adopted by Japan which has become a problem today. The Robertson screw is faster and has less cam-out (will tighten up without twisting out of the thread). However American manufacturers wanted more cam-out so they had less chance of being over tightened during the manufacturing process. Go figure. So even though a screw and screwdriver may be labeled Phillips, it may or may not be.
As an aside, I use nothing but Torx head T-25 screws now.
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