AN IMPROVED SPIKE-SCREW OR LOCK NAIL."
Year: 1880

page_text: LETTERS PATENT to Robert Crawford Perry, of Manchester, in the County of
Lancaster, for an Invention of "AN IMPROVED SPIKE-SCREW OR LOCK NAIL."
PROVISIONAL SPECIFICATION left by the said Robert Crawford Perry'
at the Office of the Commissioners of Patents on the 27th August 1880.
ROBERT CRAWFORD PERRY, of Manchester, in the County of Lancaster.
IMPROVED SPIKE-SCREW OR LOCK NAIL."
<< AN
My Invention consists in forming screws with one or more flat, curved, or
angular smooth sides, by preference two, so that the screw may be driven into the
wood in which it is to be fixed with a hammer, like a spike or nail, and when in
its place it is turned partly round, by preference one quarter round, so as to force
the thread of the screw into the unbroken portion of the wood left by the flat side
or sides, and thus secure the screw in its place; or I form nails with projecting
rims or threads, which are not spiral, at any distance apart, and extending partly
round the nails in one or more segments, on which nails I form heads, square,
hexagon, slotted, or any other shape, so that they may be turned a quarter round
and thus locked in the unbroken wood left by the flat sides when driven into their
places. These improved screws or nails hold more securely than screws or spikes
of the ordinary construction. By the use of my Invention a great saving in both
time and labour is effected, and railway chairs or other articles may be much more
rapidly laid or replaced, and made more thoroughly secure, than by the ordinary
spikes or screws. These improved screws or spikes may be used for building
ships, houses, wagons, or for other purposes.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Robert Crawford Perry in the Great Seal Patent Office on the 26th
February 1881.
ROBERT CRAWFORD PERRY, of Manchester, in the County of Lancaster.
IMPROVED SPIKE SCREW OR LOCK NAIL."
"AN
My Invention consists in forming screws with one or more flat, curved, or
angular smooth sides, by preference two, so that the screw may be driven into the
IPrice 2di

page_text: wood in which it is to be fixed with a hammer, like a spike or nail, and when in
its place it is turned partly round, by preference one quarter round, so as to force
the thread of the screw into the unbroken portion of the wood left by the flat side
or sides, and thus secure the screw in its place.
I also form nails with projecting rims or threads, which are not spiral, at any
distance apart, and extending partly round the nails in one or more segments, on
which nails I form heads, square, hexagon, slotted, or any other shape, so that they
may be turned a quarter round and thus locked in the unbroken wood left by the
flat sides when driven into their places.
These improved screws or nails hold more securely than screws or spikes of the
ordinary construction.
By the use of my Invention a great saving in both time and labour is effected,
and railway chairs or other articles may be more rapidly laid or replaced, and made
more thoroughly secure, than by the ordinary spikes or screws.
These improved screws or spikes may be used for building ships, houses, wagons,
or for other purposes.
These improved spike screws or lock nails may be struck by dies or cut, or they
may be rolled by passing strips or bars of any convenient length between rolls, in
which are suitably shaped recesses for forming the smooth side or sides and the
threads or rims, alternating with the plain cylindrical portion which forms the
shank.
When the bars have been rolled they are cut into lengths, and the head is
formed at the top of the shank as usual.
The threads or rims may be V shaped, or "square," or of other shape, and the
lock nails and "spike screws" made according to my Invention may be used to
secure together objects or articles made wholly of wood, or to secure metal to wood,
as, for instance, railway chairs to wooden sleepers, or to secure metal to metal,
when securing railway chairs to metal sleepers, or to secure parts of apparatus or
machinery made partly or wholly of metal or other material.
When these spike screws or lock nails are used in metal the parts in which the
threads or portions of threads fit must be recessed to receive them.
By the use of my Invention the time necessary for repeatedly turning the screw
is saved, as my improved spike screw or lock nail need only be turned partly round
when in its place to secure it.
Having stated the nature of my Invention, and described the manner of
performing the same,
I declare that I claim,-
A "spike screw" with a flat or smooth side or sides, so that it may be quickly
driven or forced into its place, and with segments of a spiral or not spiral thread or
threads or projections, so that when turned partly round it is secured, substantially
as herein described.
In witness whereof, I, the said Robert Crawford Perry, have hereunto set
my hand and seal, this Twenty fifth day of February, One thousand eight
hundred and eighty one.
ROBERT CRAWFORD PERRY. (L.S.)