IMPROVEMENTS IN THE CON: NECTIONS OF RODS AND TUBES, AND IN THE MANUFACTURE OF WOOD SCREWS AND OTHER SPIKES OR PINS
Year: 1877

page_text: LETTERS PATENT to Richard Richardson, of Lowdham, in the County of
Nottinghani, Engineer, for. the Invention of "IMPROVEMENTS IN THE CON:
NECTIONS OF RODS AND TUBES, AND IN THE MANUFACTURE OF WOOD SCREWS
AND OTHER SPIKES OR PINS."
Sealed the 7th December 1877, and dated the 25th June 1877.
PROVISIONAL SPECIFICATION left by the said Richard Richardson at the
Office of the Commissioners of Patents on the 25th June 1877. .
-
.
RICHARD RICHARDSON, of Lowdham, in the County of Nottingham, Engineer
"IMPROVEMENTS IN THE CONNECTIONS OF RODS AND TUBES, AND IN THE MANU-
FACTURE OF WOOD SCREWS AND OTHER SPIKES OR PINS."
In the manufacture of screwed connections of rods and tubes used in boring and
other operations, lining tubes and tubes used in the conveyance of liquids or gases
and for other purposes, and also in the manufacture of wood screws, caulking screws;
coach screws, and other screwed pins, spikes, and other articles, single threaded
screws have been employed, instead of which I employ multiple threads, the number;
angle, and shape of such threads varying according to the articles in or upon which
they are employed, by which means a better connection is made and much time
saved in the use of the same.
In the employment of a number of threads instead of one threaded screws to
boring rods, lining, tubes, and tubes employed in conveying liquids, heretofore such
rods and tubes only having a single threaded screw to connect them, a vast amount
of time has been employed in screwing and unscrewing them, but by employing a
number of threads to each, screw the connections, can be screwed and unscrewed in
Davao A71

page_text: a quarter the time heretofore necessary. The additional number of threads are
applicable to a number of articles which will be enumerated in the Final Specifi-
cation with the number of threads to be employed in each case.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Richard Richardson in the Great Seal Patent Office on the 22nd
December 1877.
RICHARD RICHARDSON, of Lowdham, in the. County of Nottingham, Engineer.
"IMPROVEMENTS IN THE CONNECTIONS OF RODS AND TUBES, AND IN THE MANU-
FACTURE OF WOOD SCREWS AND OTHER SPIKES OR PINS."
In the manufacture of screwed connections of rods and tubes used in boring and
other operations, lining tubes and tubes used in the conveyance of liquids or
gases and for other purposes, and also in the manufacture of wood screws, caulking
screws, coach screws, and other screwed pins, spikes, and other articles, single
threaded screws have been employed, instead of which I employ multiple threads,
the number, angle, and shape of such threads varying according to the article in or
upon which they are employed, by which means a better connection is made and
much time saved in the use of the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a longitudinal section of one of my improved junctions; and Figure 2,
a transverse section of the same on the line C, C, of Figure 1.
In the formation of the screwed junctions of wrought iron and other metallic
tubes, and tubular rods used in boring and other operations, and in tubes and pipes
used for the conveyance of fluids, liquids, or gases, it is needful to use a thread of
fine pitch, such joints requiring considerable time in connecting or disconnecting.
My improvement consists in the application to such screwed junctions of
multiplex threads of the like necessarily fine pitch, such multiplex threads being
cut from equidistant points on the inner or outer circumference of the tube junction,
screw, or other article, at which the screwed portion thereof is commenced, whereby
according to the multiple of thread employed, the time required in screwing up or
unscrewing such junctions is reduced in inverse proportion. For instance, as
heretofore practised, a screwed junction formed of a single thread of 12 pitch, that
is, 12 threads to one inch, requires 12 revolutions to screw up or unscrew the
length of one inch, whereas by using a quadruplex thread of the like pitch, three
revolutions only are required for screwing up or unscrewing the same length, thus
effecting a saving of time of 75 per cent. Such quadruplex threaded junction is
shewn in the Drawings connecting the adjacent ends of two lengths of tubes of
twelve inches in diameter. In Figure 1 A represents the two ends in section;
and B, the nipple partly in section and part in side view, the transverse sectional
view, Figure 2, showing the number of threads.
In like manner I apply the same method of multiplex threads in the manufacture
of lathe chased, or die-cut screws, screwed spikes, or pins, to which the same is
applicable.
The particular multiple of thread cut upon or in the tubes, rods, junctions, screws,
or other articles, may be determined, firstly, by the size of the article operated

page_text: upon; secondly, by the use to which it is designed; thirdly, by the will of the
operator.
By the application of my improvements, a further important advantage results,
inasmuch as the threads are cut in a more oblique direction, and consequently a
stronger junction is made than when a single thread is used, the latter obviously
cutting the fibre of the metal in a more nearly transverse direction.
Having thus described the nature of my said Invention, and in what manner the
same may be performed, I declare that I claim, the employment of multiplex
threads in the construction and manufacture of the articles, and for the uses herein-
before described and illustrated by the accompanying Drawings.
In witness whereof, I, the said Richard Richardson, have hereunto set my
hand and seal, this Twenty-first day of December, in the year of our Lord
One thousand eight hundred and seventy-seven.
Witness,
H. W. GOUGH, C. E.
Nottingham.
RICHARD RICHARDSON. (L.S.)