IMPROVEMENTS IN SECTOR PRESSES
Year: 1854

page_text: LETTERS PATENT to Richard Archibald Brooman, of 166, Fleet Street, in
the City of London, Patent Agent, for the Invention of "IMPROVEMENTS
IN SECTOR PRESSES." _A communication.
Sealed the 15th September 1854, and dated the 15th March 1854.
PROVISIONAL SPECIFICATION left by the said Richard Archibald Broo-1
man at the Office of the Commissioners of Patents, with his Petition,.
on the 15th March 1854.
I, RICHARD ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of
London, Patent Agent, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN SECTOR PRESSES" (communicated to me by a foreigner
residing abroad) to be as follows:-
This Invention consists of improvements in sector presses employed for
punching, cutting, and pressing metals, &c. The improvements consist, firstly,
in a method of combining the sectors, so that contact at their rolling edges.
shall always be insured, and slipping prevented. Secondly, in a method of
locking and insuring the proper set of the sectors at the moment of starting.
Thirdly, in the application of the sectors reversed to act as a power to with-
draw the punch. And, fourthly, in a mode of applying springs to support and
lift the eccentric sector, and to aid in keeping it up to its proper place. The
frame of the press consists of two cast iron plates set near together, and firmly
secured to each other, and to the bed which receives the article to be operated
on; between these the sectors work. The upper sector has its arc. struck

page_text: from the centre on which it vibrates, and in order to insure to contact at all
times with the lower sector, it is not suspended, but has its axis guided in
slotted grooves in the side plates, the grooves extending out to the front edges
of these plates. On its lower back corner it is recessed out, and has also a
tooth cast on it, the recess being to receive a projection on the lower sector,
and the tooth to take into a corresponding recess cut in the lower sector. The
edge of this latter is eccentric, and it is supported upon a cross head to which
the punch stock is attached. There are two parallel rods passing through holes
in the side plates, and secured at their lower ends to the axis of this sector,
their upper ends receiving spiral springs adjustable to any degree of com-
pression by set screws. There are also two eccentric sectors placed reversed,
and secured to this sector, one upon either side, their axes being all the same;
these latter bear against a suitable portion of the permanent cross framing.
The operation of the press is as follows:-If metal is to be punched, a proper
punch is set in the bottom of the punch stock; the sheet of metal resting
upon the bed, and the working lever attached to the lower sector is to be de-
pressed. At the moment of starting the tooth insures the joint action of the
two sectors, so that one cannot possibly slip by the other before pressure is
produced upon them. This is also prevented by the fact that the whole weight
of the upper one rests upon the lower, as before mentioned. The principle of
an eccentric sector working in connection with a true sector (the former being
the driving one) is such, that while the true sector ascends the inclined plane
it is, as it were, pushed along at the same time, because the axes of the two
are not coincident, but one (viz., that of the true sector,) is a little in advance
of the other. If the driving power were applied to the true sector it would
produce no mechanical action, but the true sector would merely slip down the
inclined plane of the eccentric sector; two eccentric sectors would operate in
the same way; hence in the making of such presses it has always been found
necessary to apply cog gearing to cause them to keep their places. In
punching the tool oftentimes sticks so hard in the hole punched out as to
require a considerable force to relieve it. This is accomplished very readily
by the power applied through the action of the reversed sectors, the edges of
which roll upon the cross framing, producing a powerful upward motion which
easily releases the punch.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Richard Archibald Brooman in the Great Seal Patent Office
on the 15th September 1854.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, RICHARD
ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of London, Patent
Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fifteenth day of March, in the year of our Lord
One thousand eight hundred and fifty-four, in the seventeenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Richard Archibald Brooman, Her special licence, that I, the said Richard
Archibald Brooman, my executors, administrators, and assigns, or such others
as I, the said Richard Archibald Brooman, 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 "IM-
PROVEMENTS IN SECTOR PRESSES," (communicated to me by a foreigner residing
abroad,) upon the condition (amongst others) that I, the said Richard Archibald
Brooman, 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 Richard Archibald Brooman, 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, reference being had to the Drawings hereunto annexed,
that is to say:-
The Invention consists of improvements in sector presses employed for
punching, cutting, and pressing metals, &c. The improvements consist, firstly,
in a method of combining the sectors, so that contact at their rolling edges
shall always be insured, and slipping prevented. Secondly, in a method of
locking and insuring the proper set of the sectors at the moment of starting.
Thirdly, in the application of the sectors reversed to act as a power to
withdraw the punch. And, fourthly, in a mode of applying springs to
support and lift the eccentric sector, and to aid in keeping it up to its proper
place.

page_text: Figure 1 of the Drawings annexed is a side view, and Figure 2 a front
view of a press constructed with these improvements. A, A, is a strong cast
iron frame, formed with an appropriate opening a, to allow of the article to be
punched, pressed, &c. being placed on the bed a. This frame consists of
two cast iron plates set near together, and firmly secured to each other, and to
the bed a', which receives the article to be operated on; between these the
sectors work. The upper sector B has its are struck from the centre b, on
which it vibrates, and in order to insure contact at all times with the lower
sector it is not suspended, but has its axis guided in slotted grooves b', 6', in
the side plates A, A, the grooves extending out to the front edges of these
plates. On its lower back corner it is recessed out, and has also a tooth c cast
on it, the recess being to receive a projection on the lower sector, and the
tooth to take into a corresponding recess cut in the lower sector C. The edge
of this latter is eccentric, and it is supported upon a cross head d, to which
the punch stock e is attached. f. f, are two parallel rods passing through holes
in the side plates, and secured at their lower ends to the axis of the sector C,
their upper ends receiving spiral springs adjustable to any degree of compres-
sion by set screws. D are two eccentric sectors placed reversed, and secured
to the sector C, one upon either side, their axes being all the same; these
latter bear against a suitable portion of the permanent cross framing D¹. The
operation of the press is as follows:- If metal is to be punched, a proper
punch is set in the bottom of the punch stock e, the sheet of metal resting
upon the bed a¹, and the working lever F attached to the lower sector is to be
depressed. At the moment of starting the tooth c ensures the joint action. of
the two sectors, so that one cannot possibly slip by the other before pressure,is
produced upon them. This is also prevented by the fact that the whole weight
of the upper one rests upon the lower, as before mentioned. The principle. of
an eccentric sector working in connection with a true sector (the former being
the driving one) is such, that while the true sector ascends the inclined plane
it is, as it were, pushed along at the same time, because the axes of the two
are not coincident, but one (viz., that of the true sector,) is a little in advance.
of the other. If the driving power were applied to the true sector it would
produce no mechanical action, but the true sector would merely slip down the
inclined plane of the eccentric sector; two eccentric sectors would operate in
the same way; hence in the making of such presses it has always been found
necessary to apply cog gearing to cause them to keep their places. In punching
the tool oftentimes sticks so hard in the hole punched out as to require a con-
siderable force to relieve it. This is accomplished very readily by the power
applied through the action of the reversed sectors D, the edges of which roll

page_text: upon the cross framing D¹, producing a powerful upward motion which easily
releases the punch.
And having now described the nature of the said Invention, and in what
manner the same is to be performed, I declare that what I claim as the said
Invention is, -
First, combining an eccentric sector with a true sector for the purpose of
forming a press, as described.
Second, suspending the true sector in its frame in such way that its full
weight will always rest upon the edge of the lower sector, as described.
And, third, the combination of the reversed eccentric sectors with the lower
sector and some fixed portions of the frame, for assisting in withdrawing the
punch, as described.
In witness whereof, I, the said Richard Archibald Brooman, have
hereunto set my hand and seal, this Fifteenth day of September, One
thousand eight hundred and fifty-four.