IMPROVEMENTS MACHINERY OR APPARATUS FOR FORGING OK CHAPING GRANAS UN BARD
Year: 1860

page_text: LETTERS PATENT to John Platt, of Oldham, in the County of Lancaster,
Mechanical Engineer, for the Invention of "IMPROVEMENTS
MACHINERY
OR APPARATUS FOR FORGING OK CHAPING GRANAS UN BARD
PROVISIONAL SPECIFICATION left by the said John Platt at the Office
of the Commissioners of Patents, with his Petition, on the 6th October
1860.
IN
I, JOHN PLATT, of Oldham, in the County of Lancaster, Mechanical Engineer,
do hereby declare the nature of the said Invention for "IMPROVEMENTS
MACHINERY OR APPARATUS FOR FORGING OR SHAPING CRANKS OR BARS OF METAL,"
to be as follows:-
In the machinery which forms the subject of my Invention there are three
divisions, by means of one of these the metal is forced forward so as to effect
the required bending, and the other two thrust the bar in the direction of its
length so as to furnish the quantity required for the crank. These three
operations are not effected by separate motions, but are so brought into action
as to be mutually dependent, and act therefore complete in themselves as one
motion.
A convenient arrangement of the machinery consists in placing the bar upon
bottom dies capable of sliding towards each other; above these is a plunger,
[Price Sd.]
+

page_text: which, when caused to descend, bends the metal for the required crank, bringing
at the same time top dies to bear upon the bar, and operating by inclined
planes so as to contract it in the direction of its length, which inclined planes
also cause the bar to be held firmly for that operation.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Platt, in the Great Seal Patent Office on the 6th
April 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, J, JOHN
PLATT, of Oldham, in the County of Lancaster, Mechanical Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent bearing date the Sixth day of October, in the year of our Lord
One thousand eight hundred and sixty, in the twenty-fourth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said John Platt, Her special license that I, the said John Platt,
my executors, administrators, and assigns, or such others as I, the said
John Platt, 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 vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for IMPROVEMENTS
IN MACHINERY OR APPARATUS FOR FORGING OR SHAPING CRANKS OR BARS OF METAL,"
upon the condition, amongst others, that I, the said John Platt, by an
instrument in writing under my hand and seal; should particularly de-
scribe 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 1, the said John Platt, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement and accompanying Drawings (that is to say):-
My Invention consists in the employment of machinery whereby a crank-
formed bar is produced by thrusting or forcing the metal in two directions. the
one to effect the required bending, and the other lengthwise. These effects,

page_text: however, are not produced by motions acting separately, but by a concerted
action, so as to render them mutually dependent.
The apparatus consists of two dies with certain moveable parts, which dies
may be adapted to a steam hammer or other machinery capable of effecting
suflicient pressure.
In the accompanying Drawings, Fig. 1 represents one of the dies in section.
this may be considered a top die, and Fig. 2 is a view, also in section, of the
bottom die; Fig. 3 is a sectional view of the two dies brought together, with
a bar between them on which a crank has been forged or shaped; Fig. 4 is
a plan of the under side of the top dic, Fig. 1, and Fig. 5, a plan of the upper
side of the bottom die, Fig. 2.
The body of the upper die is shewn at a, provided with a boss b, by which
it may be attached to a steam hammer or other machine. To the body a are
attached projecting parts c, the inward sides of which are inclined planes q
provided with grooves d, within which are mounted pieces e, having on their
under sides rounded cavities f, such cavities being somewhat less than one-
half the diameter of the bar to be shaped. The pieces e have a central
projecting part, as seen in Fig. 4, and on either sides of this there are inclined
formed parts g. To the centre of the body a is fixed a punch h, the office of
which, as will hereafter be seen, is to press the metal downward in order to
effect the required bending. The body of the bottom die is shewn at i
provided with a boss by which it may be attached to the machine. Upon
this are mounted in guides two sliding pieces 1, each one having two projecting
parts,, between which is a cavity m, equal to somewhat less than one-half
the diameter of the bar to be shaped. The projections 1, P, are provided with
inclines n, corresponding in angle to the inclines g of the top die. At a is a
central part for giving shape to the lower part of the crank.
The operation is as follows:-Supposing the top die to be drawn up, as in
Figs. 1 and 2, the heated bar of metal is placed in the bottom die, Fig. 2, as.
shewn by the red lines, and the upper die is then caused to descend; in doing
this the points of the inclines g will pass clear of those shewn at n in the bottom
die, and the pieces e will arrive in contact with the bar of metal and will press
it in the cavities m; the top die, however, still descending, will impart, by
means of the inclines q, an inward motion to the pieces e, so as to bring the
inclines in contact with those shewn at n, and then a compound effect will
be produced, for the sliding pieces will then be carried forward by the action
of the inclines q, while, at the same time, the pieces e will be forced downward
by the inclines n, the effect of which will be that the bar will be securely held.
and will be thrust in the direction of its length from opposite ends. During

page_text: these operations the central punch will have descended, and will have been
acting upon the bar so as to bend it downward upon the bottom die at o.
Thus it will be seen that the quantity of metal necessary for preventing an
attenuation at the cranked part is provided by means which move bodily with
the central punch. The crank having been formed the top die is caused to
rise, when the pieces e will be drawn back by the action of the inclines into
the position shewn at Fig. 1, after which the sliding pieces are thrust backward
by hand, and the apparatus is ready for a repetition of the operations above
described. The distance to which the sliding pieces I may be moved backward
is determined by set screws r, which thus regulate the quantity of metal to be
afforded for the bending; for, supposing the screws to be turned so as to slide
the pieces nearer to each other, then a wider space will be caused to exist
between the inclines g, n, and the pieces will have to travel further before
they communicate motion to the bar.
Having thus described and ascertained the nature of my said Invention, and
the manner in which the same is to be performed, I desire it to be understood
that I claim as secured to me under the above in part recited Letters Patent,
the use of the inclines shewn and described for holding the bar and thrusting
it in the direction of its length for the purpose above set forth.
In witness whereof, I, the said John Platt, have hereunto set my hand
and scal, this Fifth day of April, in the year of our Lord One thousand
eight hundred and sixty-one.