IMPROVEMENTS IN THE MANUFACTURE OF RIVETS AND BOLTS
Year: 1853

page_text: LETTERS PATENT to Robert Griffiths, of 69, Mornington Road.
Regent's Park, in the County of Middlesex, for the Invention of
PROVISIONAL SPECIFICATION left by the said Robert Griffiths
at the Office of the Commissioners of Patents, with his Petition,
on the 1st August 1853.
1, ROBERT GRIFFITHS, of 69, Mornington Road, Regent's Park, in
the County of Middlesex, do hereby declare that the nature of my
Invention for "IMPROVEMENTS IN THE MANUFACTURE OF RIVETS AND
BOLTS to be as follows:-
"
Heretofore when making rivets and bolts it has been usual to
employ rods of iron of the diameter of the stems of the rivets or bolts.
and to press or upset one end of each piece (which is cut off) to form
a head.
Now my improvements consist of employing iron rolled to the
diameter of the heads of the rivets or bolts to be made therefrom, and

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Robert Griffiths in the Great Seal Patent Office,
on the 27th January 1854.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
ROBERT GRIFFITHS, of 69, Mornington Road, Regent's Park, in the
County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the First day of August, in the year of our
Lord One thousand eight hundred and fifty-three, in the seventeenth
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Robert Griffiths, Her special licence that I,
the said Robert Griffiths, my executors, administrators, and assigns, or
such others as I, the said Robert Griffiths, my executors, adminis-
trators, and assigns, should at any time agree with, and no others, from
time to time and at all times thereafter during the term therein ex-
pressed, should and lawfully might make, use, exercise, and vend, within
the United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an invention for "IMPROVEMENTS IN THE MANUFACTURE
OF RIVETS AND BOLTS," upon the condition (amongst others) that I, the
said Robert Griffiths, by an instrument in writing under my hand and
seal, 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 Robert Griffiths, 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 thereof (that is to say):
My Invention consists in an arrangement and construction of machi-
nery for forming bolts or rivets by rolling them, instead of the ordinary

page_text: method of forging or compressing the heads by hand work or machinery.
In order that my Invention may be fully understood, and readily carried
into effect, I will proceed to describe the same, referring to the accom-
panying Drawings.
Figure 1, is an elevation; Figure 2, a plan of the machine; Figure 3,
a section; Figure 4, an elevation of roller and ring p, which does the
office of a third roller; Figure 5, section of (0, 0).
The machine consists of a main casting (e), which carries the bearings
of the vertical and horizontal shafts (f) and (h), the horizontal shaft (h)
being the driver. Upon the vertical shaft (f) is keyed a carriage (d)
which carries three pairs of small rollers (0, 0), which are turned to a
shape requisite to form the rivet. (p) is a ring, also formed with cor-
responding grooves to the rollers requisite to mould the rivet into the
required form, and which ring is placed in such an eccentric position
with regard to the rollers as to decrease the distance between it and the
rollers during the revolution of the latter, and to roll the rivet as shewn
in Figure 5, (p) being the rivet. The pressure of the rollers is received
by the bearing or necks of the rollers revolving against the stationary
dises (a) and (b). The pressure on the ring (p) is received by the sides
of the top of the main casting, and is adjusted and fixed in its required
position by keys or bolts, or any other suitable fastenings. (k, and 7,) are
shears; (m, and n,) being the steel cutters. (1) is the stationary blade,
and (k) the moveable one, and is moved by means of the excentric (i)
fixed upon the horizontal shaft. t, is a guage, by means of which the
iron is cut to the necessary length. (s) is a guide for conducting the cut
iron in a vertical position to the rollers (0,) (0). (7) is a stud, which is
pressed forward by the shears on ascending, and retains the piece of
iron fast until the rollers receive it and carry it forward gradually,
rolling it against the excentric ring (p) to the form required, when it
falls through the opening (,) finished. (w) is the piece of hot iron to
be cut by the shears (k, l).
Should it be found necessary, teeth may be placed upon the bearings
of the rollers (0, 0), working into corresponding teeth upon the disc (a),
so as to ensure their revolution.
Having thus described my Invention, and the method of performing

page_text: the same, I wish it to be understood that I do not confine myself to the
exact details described above; but what I claim is, the making of bolts
or rivets by rolling them separately in the direction of their circum-
ference from pieces of iron of suitable lengths.
In witness whereof, I, the said Robert Griffiths, have hereunto
set my hand and seal, this Twenty-sixth day of January, in
the year of our Lord One thousand eight hundred and fifty-four.
Witness,
J. S. TONGUE.
ROBT GRIFFITHS. (L.S.)