Lee Valley Tools Woodworking Newsletter
Vol. 1, Issue 5
July 2007
Featured Patents

Referring particularly to the form of the invention shown in Figure 3 of the drawing, the formation of the slot 6 in diagonal relation to the central rectangular socket produces a particularly valuable combination since it will be observed that in so relating the respective screw driver receiving recesses the combination is produced by the very minimum displacement or removal of metal from the head with a consequent reduction in wear and strain on the forming dies or tools, consuming less energy in production and reducing the ultimate cost to the consumer below that at which screws could be produced with a socket and slot not diagonally related.

This is true as applied to either flat or round-headed screws and while I have chosen to illustrate my diagonal socket and slot combination as applied to a round headed screw, it is to be understood that the invention is not to be construed as limited to use in this connection, since a common advantage is obtained in either case.

Screws constructed as described are universally adaptable for all classes of use and the work of the mechanic will be greatly facilitated for the type of head shown may be applied to wood or metal screws.

What I claim as my invention is:

An improved screw having a head formed with a central rectangular socket in combination with a slot extending across the head and diagonally intersecting the socket, whereby said combined socket and slot are formed with the minimum displacement of metal.

Peter L. Robertson.


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