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Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken. [3]: 85–86 They also allow the use of angled screwdrivers and trim-head screws. The socket-headed Robertson screws are self-centering and reduce cam out. They also stop a power tool when set, and can be more easily ...
Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken. [15]: 85–86 They also allow for the use of angled screw drivers and trim head screws. The socket-headed Robertson screws reduce cam-out, stop a power tool when set, and can be removed if painted over or old and rusty.
Up-close image of the Robertson square-head screwdrivers. He had originally established his company, the P.L. Robertson Manufacturing Company, in Hamilton, Ontario in 1907. [ 3 ] [ 4 ] Robertson then relocated the company to produce his screws in Milton, Ontario , the following year after the town had given a $10,000 loan for the factory's ...
Robertson, also known as a square, [15] or Scrulox [16] screw drive has a square-shaped socket in the screw head and a square protrusion on the tool. Both the tool and the socket have a taper, which makes inserting the tool easier, and also tends to help keep the screw on the tool tip.
In 1908, Canadian P. L. Robertson was the first to make the internal-wrenching square socket drive a practical reality by developing just the right design (slight taper angles and overall proportions) to allow the head to be stamped easily but successfully, with the metal cold forming as desired rather than being sheared or displaced in ...
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