IMPROVEMENTS IN THE MODE OP AND APPARATUS, FOR FORMING SCREW THREADS ON WROUGHT-IRON BOLTS
Year: 1868

page_text: ETTERS PATENT to Mare Antoine François Mennons, of the Firm
of Mennons and Telescheff, Home and Foreign Patent Agents, of
96, Newgate Street, in the City of London, and 51, Rue de la
Chaussée d'Antin, Paris, in the Empire of France, for the In-
vention of "IMPROVEMENTS IN THE MODE OP AND APPARATUS, FOR FORMING
SCREW THREADS ON WROUGHT-IRON BOLTS."-A Communication from
Alexis Belaieff, residing at Saint Petersburg, in the Empire of
Russia.
PROVISIONAL SPECIFICATION left by the said Marc Antoine François
Mennons at the Office of the Commissioners of Patents, with his
Petition, on the 6th November 1868.
I, MARC ANTOINE FRANÇOIS MENNONS, of the Firm of Mennons
5 and Telescheff, Home and Foreign Patent Agents, of 96, Newgate
Street, in the City of London, and 51, Rue de la Chaussée d'Antin,
Paris, in the Empire of France, do hereby declare the nature of the said

page_text: Invention for "IMPROVEMENTS IN THE MODE OF AND APPARATUS FOR FARMING
SCREW THREADS ON WROUGHT-IRON BOLTS," (a communication), to be as
follows:-
This Invention consists in the application, as hereafter described, of a
swaging process by means of improved apparatus to the formation of
screw threads on wrought-iron bolts.
Figure 1 of the accompanying Drawing represents in elevation
one of the forms of apparatus by which the Invention may be
executed; Figure 2 is a sectional plan of the same through the line f, g,
Fig. 1.
a is a cast or wrought-iron frame provided with guides a', a', for the
vertical motion of the upper swage or die c, which may be raised or
lowered by the hand by the end e; b, c, are the steel dies or swages, one
of which is set at the bottom of the frame a, while the other c is adjusted
to move vertically between the guides a, a. The hole is pierced
through the centre of the division line f, g, to a diameter slightly superior
to that of the bolt to be threaded, and is afterwards tapped to the required
depth. Thus, for instance, for a bolt of three-quarters of an inch the
hole should have a diameter of about fifteen-sixteenths of an inch; for
a one-inch bolt the hole should be of one and three-eighths of an inch,
and so in proportion for the different dimensions.. The hole being
tapped as above the surfaces of contact of the swages b, c, are filed or
otherwise ground down until a sharp and deep thread is obtained on a
test bolt. The vertical diameter of the hole is thus reduced to the oval
form shewn in Figure 1, by aid of which the circularity of the bolt is
preserved during the threading process. The bolt d, Fig. 2, being
brought to a red heat is passed into the hole h between the swages b, c;
the hammer is applied to the head of the latter, and at same time
the bolt being turned to the extent of a quarter of a circle at each
motion a clear and sharply defined thread is produced.
The form, dimensions, and general details of construction of the
apparatus may be varied according to circumstances.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Marc Antoine François Mennons in the Great
Seal Patent Office on the 24th April 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MARC
ANTOINE FRANÇOIS MENNONS, of the Firm of Mennons and Telescheff,
Home and Foreign Patent Agents, of 96, Newgate Street, in the City of
London, and 51, Rue de la Chaussée d'Antin, Paris, in the Empire of
France, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of November, in the year of
our Lord One thousand eight hundred and sixty-eight, in the thirty-
second. year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Marc Antoine François Mennons,
Her special licence that I, the said Marc Antoine François Mennons,
my executors, administrators, and assigns, or such others as I, the
said Marc Antoine François Mennons, my executors, administrators, and
assigns, should at any time agree with, and no others, from time to
time and at all times thereafter during the term therein expressed,
should and lawfully might make, use, exercise, and rend, within the
United Kingdom of Great Britain. and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS IN THE MODE OF AND
APPARATUS FOR FORMING SCREW THREADS ON WROUGHT-IRON BOLTS," a com-
munication from Alexis Belaieff, a person resident at St. Pétersburg,
in the Empire of Russia, upon the condition (amongst others) that I,
the said Marc Antoine François Mennons, my executors or adminis-
trators, by an instrument in writing under my, or their, or one of
their hands and seals, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the
said Letters Patent.
NOW KNOW YE, that I, the said Marc Antoine François Mennons,
do hereby declare the nature of the said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement, reference being had to the Figures

page_text: of the accompanying Drawing and to the letters marked thereon, that
is to say:
This Invention consists in the application, as hereafter described, of a
swaging process by means of improved apparatus to the formation of
screw threads on wrought-iron bolts.
Figure 1 of the accompanying Drawing represents in elevation one of
the forms of apparatus by which the Invention may be excented;
Figure 2 is a sectional plan of the same through the line f, g, Figure 1.
a is a cast or wrought iron frame provided with guides a', a', for the
vertical motion of the upper swage or die c, which may be raised or
lowered by the hand by the end e; b, c, are the steel dies or swages, one
of which bis set at the bottom of the frame a, while the other c is
adjusted to move vertically between the guides a', a'. The hole is
pierced through the centre of the division line f, g, to a diameter slightly
superior to that of the bolt to be threaded, and is afterwards tapped to
the required depth. Thus, for instance, for a bolt of three-quarters of an
inch the hole should have a diameter of about fifteen-sixteenths of an
inch; for a one-inch bolt the hole should be of one and three-eighths
of an inch, and so on in proportion (or approximately for the different
dimensions. The hole being tapped as above, the surfaces of contact of
the swages b, c, are filed or otherwise ground down until a sharp and
deep thread is obtained on a test bolt. The vertical diameter of the
hole is thus reduced to the oval form shewn in Figure 1, by aid of which
the circularity of the bolt is preserved during the threading process.
The bolt d, Fig. 2, being brought to a red heat is passed into the hole
between the swages b, c; the hammer is applied to the head of the
latter (c), and at same time the bolt being turned to the extent of a
quarter of a circle at each motion a clear and sharply defined thread is
produced.
The form, dimensions, and general details of construction of the
apparatus may of course be varied according to circumstances.
Having now described the nature of the said Invention, and the
manner in which it may be carried into effect, I declare that what I
claim and desire to protect by Letters Patent is, the application to the
formation of screw threads on wrought-iron bolts of a swaging process
performed as above by aid of matrices provided with a tap hole of oval
form in cross section, in manner and for the purpose substantially as

page_text: herein specified and shewn in the Figures of the accompanying
Drawing.
In witness whercof, I, the said Marc Antoine François Mennons,
have hereto set my hand and seal, this Twenty-second day
of April, in the year of our Lord One thousand eight hundred
and sixty-nine.