AN IMPROVED AUGER OR BORING TOOL
Year: 1856

page_text: LETTERS PATENT to Richard Archibald Brooman, of 166, Fleet Street,
in the City of London, Patent Agent, for the Invention of "AN IMPROVED
AUGER OR BORING TOOL."-A communication.
Sealed the 14th January 1857, and dated the 31st July 1856.
PROVISIONAL SPECIFICATION left by the said Richard Archibald
Brooman at the Office of the Commissioners of Patents, with his
Petition, on the 31st July 1856.
I, RICHARD AROHIBALD BROOMAN, of 166, Fleet Street, in the City of
London, Patent Agent, do hereby declare the nature of the said Invention
for "AN IMPROVED AUGER OR BORING TOOL," (communicated to me by a
foreigner residing abroad,) to be as follows:-
This Invention consists in constructing an expanding or adjustable auger or
boring tool much after the plan known as a "lip bit," and in inserting in the
shaft thereof a peculiar cutter, which, following the first, cuts away the wood
or other material at bottom, so as to make a hole larger than that made by
the first cutter, and which is also capable of being delicately adjusted in order
that a hole may be produced of any desired size within the limits of the
particular tool employed.
An auger or bit is first made having a stout shaft, and a lip capable of
boring an ordinary hole, of say an inch in diameter, and may be used for that
purpose when a hole of that size is required. Through the shaft a longitudinal

page_text: slot is made, into which is inserted a thin plate of steel bent at the lower
end into a cutting lip, and having a spur as in bits for fine work. This plate
or auxiliary cutter is strengthened by a rib along its outer edge, and is
secured to the shaft by having several sets of holes made towards its lower
end, through which and a corresponding line of holes in the shaft a pin is
driven, and also by a similar pin in another set of holes near the top. The
holes in the cutter plate are so spaced that by the use of the pin in any one
of them, in combination with the position of the pin in the holes at the upper
part, any delicate adjustment as to the extension or expansion of the cutter
may be obtained. This may be additionally secured by a set screw, which also
holds the cutting part rigidly against the shaft, whereby smoother work may be
performed: The-pins-should be tapering as thereby they may be driven in to
fit closely, and yet be removed by a light blow. The cutter plate not being
set quite down to the end of the auger, the auger proper will first cut out its
own hole which will be enlarged by the spur, the lip of the cutter plate turn-
ing up an annular shaving between the spur, and the outside of the hole
which is being bored a little in advance by the "auger.
thrust of the cutter plate is resisted not merely by the screw, but also by the
bearing of the lower end of the auger against so much of its hole as precedes
that made afterwards by the cutter plate.
Hence the lateral
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 31st January 1857.
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 Thirty-first day of. July, in the year of our Lord
One thousand eight hundred and fifty-six, in the twentieth 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

page_text: the United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "AN IMPROVED AUGERIOR: BORING 'TOOL,"
(communicated to me by a foreigner residing abroad,) upon the condition
(amongst others) that I, the said Richard Archibald Brooman, my executors
or administrators, 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 obe
performed, and cause the same to be filed in the Great Seal.Patent Officó
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 tho.samo 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:-
This Invention consists in constructing an expanding or adjustable auger or
boring tool much after the plan known as a "lip bit," and in inserting in the
shaft thereof a peculiar cutter, which, following the first, cuts away the wood
or other material at bottom, so as to make a hole larger than that made by
the first cutter, and which is also capable of being delicately adjusted, in
order that a hole may be produced of any desired size within the limits of the
particular tool employed.
:
In the annexed Drawings, Figure'l is a front, Eigure 2. an edge, and
Figure 3, a bottom or end view of this auger or boring tool, with a portion
of the cutter plate represented broken out to shew the construction of the
instrument. An auger or bit is first made having a stout shaft a, and a lip a¹,
capable of boring an ordinary hole of, say, one-half of an inch in diameter,
and may be used for that purpose when a hole of that size is required.
Through the shaft a, a longitudinal slot c, Figure 2, is made, into which is
inserted a thin plate of steel b, bent at the lower end into a cutting lip, and
having a spur e, as in bits for fine work. This plate 6, or auxiliary cutter, is
strengthened by a rib d along its outer edge, and is secured to the shaft a by
having several sets of holes made towards its lower end, as shewn at f,
Figure 1, through which and a corresponding line of holes in the shaft, a
pin i is driven, and also by a similar pin in another set of holes h, near the
top. The holes fin the cutter plate are so spaced that by the use of the
pin i, in any one of them, in combination with the position of the pin in the
holes at the upper part, any delicate adjustment as to the extension or expan-
sion of the cutter may be obtained. This may be additionally secured by a

page_text: set screw k, which also holds the cutting part rigidly against the shaft, whereby
smoother work may be performed. The pins are tapering, as thereby they may
be driven in to fit closely, and yet be removed by a light blow.
The cutter plate not being set quite down to the end of the auger, the
auger proper will first cut out its own hole which will be enlarged by the
spur e, the lip of the cutter plate turning up an annular shaving between
the spur and the outside of the hole, which is being bored a little in advance
by the auger. Hence the lateral thrust of the cutter plate is resisted not
merely by the screw 1, but also by the bearing of the lower end of the auger a,
against so much of its hole as precedes that made afterwards by the cutter
.plate.
And having now described the nature of the said Invention, and in what
manner the same is to be performed, I declare that I claim,-
The construction of an expanding or adjustable boring tool, in the manner
and for the purpose substantially as herein described..
In witness whereof, I, the said Richard Archibald Brooman, have here-
unto set my hand and seal, this Twenty-eighth day of January, One
thousand eight hundred and fifty-seven.
R. A. BROOMAN. (L.D.)