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.