Improvements in the Form and Construction of 'Metal Screws and Screw Threaded Articles for Woodwork, Leather, and other ) Materials.
Year: 1891

page_text: Date of Application, 13th Feb., 1891. :
Complete Specification Left, 12th Nov., 1991-Accepted, 2nd Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Form and Construction of 'Metal Screws and
Screw Threaded Articles for Woodwork, Leather, and other
) Materials.
...l
"
'
1, JOSEPH THOMPSON STEEN of 113 Wool Exchange in the City of London
Merchant (a communication to me from abroad by Joseph James Macky of
Auckland Provincial District of Auckland New Zealand Agent), do hereby
declare the nature of this invention to be as follows:-
This invention relates to nails hooks fasteners and the like that may be threaded
for screwing and also to screws of all kinds required for driving into wood leather
composite and other suitable materials.
"
As hitherto made metal screws have been round where threaded for screwing
and the threads circular and continuous around the shank'from beginning to end."
For screws so made it is usually necessary when used that 'holes be made for
them to be driven into and it is also absolutely necessary if the threads are intended
to hold into and embed themselves in the material into which they are driven that
the screws be turned round screwed in and not driven in by a hammer.
In'most substances or materials it is absolutely necessary that a
for the screw.
I
hole be made
If the ordinary screw with round threads 'be driven home by a hammer the
threads cut through the material break the fibre and tear away that which the
threads should be held by and into which they otherwise ought to be embedded.
My invention consists in making metal screws oval or nearly so or with two flat
or nearly flat sides.
The parts or divisions; of this screw having the longer radii are the 'only parts to
be threaded for screwing the sides so called because of their shorter radii and
which separate the other two threaded divisions are not to be threaded. A screw
so made can be driven home or as far as required with a hammer and even if not
turned round a 'quarter of its circumference and screwed in to that extent as it
should be it will hold as tightly as a nail with however this advantage that when
required to be taken'out it. will unscrew.
"But if this screw be turned a quarter of its circumference in the oval or oblong
hole which it has made for itself the threads will embed themselves very tightly in
the sides of the hole that have the shorter radii and will hold the screw most
effectually.
. 1.4.
In this Specification it is only the threaded parts of the metal screws that I
refer to.
COMPLETE SPECIFICATION.
Improvements in the Form and Construction of Metal Screws and
Screw Threaded Articles for Woodwork, Leather, and other
Materials.
JOSEPH THOMPSON STEEN of 113 Wool Exchange Loudon Merchant do
hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to nails hooks fasteners and the like that may be threaded

page_text: for screwing and also to screws of all kinds required for driving into wood leather
composite and other suitable materials.
As hitherto made metal' screws have been round where threaded for screwing
and the threads circular and continuous around the shank from beginning to end.
For screws so made it is usually necessary when used that holes be made for
them to be driven into and it is also absolutely necessary if the threads are intended
to hold into and embed themselves in the material into which they are driven that
the screws be turned round screwed in and not driven in by a hammer.
In most substances or materials it is absolutely necessary that a hole be made for
the screw.
If the ordinary screw with round threads be driven home by a hammer the
threads cut through the material break the fibre and tear away that which the
threads should be held by and into which they otherwise ought to be embedded.
My invention consists in making metal screws oval or nearly so or with two flat
or nearly flat sides.
The parts or divisions of this screw having the longer radii are the only parts
to be threaded for screwing the sides so called because of their shorter radii and
which separate the other two threaded divisions are not to be threaded.
A screw
so made can be driven home or as far as required with a hammer and even if not
turned round a quarter of its circumference and screwed in to that extent as it
should be it will hold as tightly as a nail with however this advantage that when
required to be taken out it will unscrew.
But if this screw be turned a quarter of its circumference in the oval or oblong
hole which it has made for itself the threads will embed themselves very tightly
in the sides of the hole that have the shorter radii and will hold the screw most
effectually.
In this Specification it is only the threaded parts of the metal screws that I
refer to.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1
The constructing of metal screws in the manner hereinbefore stated and the
special novelty which I claim for my invention is the making of metal screws oval
or nearly so instead of round or with flat or nearly flat sides slightly oblong and
with threads for screwing cut only on the surfaces of longer radii so that the screw
when driven home or part of the way home may be firmly held on being turned a
quarter round by the threads embedding themselves in the sides of the hole that
have the shorter radii.
Dated this 12th day of November 1891.