IMPROVEMENTS IN CIRCULAR SAWING MACHINERY
Year: 1857

page_text: LETTERS PATENT to Richard Archibald Brooman, of 166, Fleet Street,
in the City of London, E.C., Editor of the Mechanics' Magazine and
Patent Agent, for the Invention of "IMPROVEMENTS IN CIRCULAR SAWING
MACHINERY." A communication from Messieurs Boccard and Coqueval.
Sealed the 29th January 1858, and dated the 1st August 1857.
PROVISIONAL SPECIFICATION left by the said Richard Archibald
Brooman at the Office of the Commissioners of Patents, with his
Petition, on the 1st August 1857.
I, RICHARD ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of
London, E.C., Editor of the Mechanics' Magazine and Patent Agent, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
CIRCULAR SAWING MACHINERY," (communicated to me by Messieurs Boccard
and Coqueval, foreigners residing abroad,) to be as follows:-
This Invention consists in fitting over a circular saw a semicircular metal
envelope, held by a bar made to travel up and down in a standard, upon
motion being communicated by a screw, and having hinged to it just in front
of the saw a set of rods and levers connected and adjusted in such manner as
to allow of the passage of the wood to be cut, and to fall down upon the saw
bench or bed immediately after the wood has passed, and thereby prevent
injury to the workman or attendant feeding the saw.
The Invention also consists of a regulating gauge for determining the.

page_text: breadth at which the wood is to be cut. At the side of the bench there is a
graduated dial, and connected to it a threaded rod, the further end of which
is fixed to a sliding gauge. The threads on the rod correspond to the gradua-
tions on the dial, and an index or pointer shews the distance at which the
gauge is set from the saw. On turning the dial, and with it the threaded
rod, the gauge will be made to approach towards or recede from the saw.
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 1st February 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, RICHARD
ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of London, E.C., Editor
of the Mechanics' Magazine and Patent Agent, 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-seven, in the twenty-first 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 "IMPROVEMENTS IN CIRCULAR SAWING MACHINERY," (a communication from
Messieurs Boccard and Coqueval,) 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 Inven-
tion, 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 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 thereof, reference being had to the Drawings
hereunto annexed, that is to say:-

page_text: This Invention consists in fitting over a circular saw a semicircular metal
envelope, held by a bar made to travel up and down in a standard upon
motion being communicated by a screw, and having combined with it just in
front of the saw a set of rods and levers connected and adjusted in such
manner as to allow of the passage of the wood to be cut, and to fall down
upon the saw bench or bed immediately after the wood has passed, and
thereby prevent injury to the workman or attendant feeding the saw.
The Invention also consists of a regulating gauge for determining the
breadth at which the wood is to be cut. At the side of the bench there is a
graduated scale, and connected to it a threaded rod, the further end of which
is fixed to a sliding gauge. The threads on the rod may correspond to the.
graduations on the scale which shew the distance at which the gauge is set
from the saw. On turning the threaded rod the gauge will be made to
approach towards or recede from the saw.
Figure 1 of the Drawings hereunto annexed is an elevation, and Figure 2,
a plan, of an arrangement of sawing machinery with the foregoing improve-
ments applied thereto. a is the metallic guard or envelope, which is partially
surrounded by a metallic band b, connected to it by the transverse clips c; d is
a curved rod carrying at one end by a straight rod f, the guard plate e, which
is equal in breadth to the guard or envelope a. When the workman intro-
duces the wood to be cut in the direction of the arrow, the curved rod d turns
about its axis g, and raises the rod f, and guard plate e, thereby allowing the
wood to reach the saw. As soon as the wood is past, the guard plate e
descends upon the bench A, and the rods f and d return to the positions
shown in the Figures, thus protecting the hands of the workman from the
saw. The height of the guard or envelope a, is adjusted according to the
thickness of the wood to be cut, by means of a supporting bar k, which is
connected at one end to the guard a. An up or a down motion is imparted
to the bar k, by a guide n, which is moved up or down by a screw l, worked
by a crank handle . The support B which carries the guide m is graduated,
in order that the envelope a may be placed and retained at any suitable
distance. The guide m is slotted in order that as the saw is worn away the
guard or envelope a may be moved in such manner as to preserve a uniform
distance between the two.
The next improvements relate to the gauge or guide piece p, which is so
fitted that it may be set at any required distance from the saw according to
the breadth to be given to the wood to be cut, which wood is simply placed
against the gauge or guide piece p, and pushed forward to the saw. The
gauge p is attached to a screw a, worked by a crank handle f¹, whereby it is

page_text: moved nearer to or farther from the saw as required; g¹ is a graduated
scale for indicating the distance between the gauge p, and the saw. To
impart rigidity and parallelism of motion to the gauge p, it is furnished with
rods v, v, sliding in holes in the bench or frame. The contrivances above
described may be replaced by any equivalent arrangements without departing
from this Invention.
And having now described the nature of the said Invention, and in what
manner the same may be performed, I declare that I claim,―
First, the application to circular sawing machinery of an adjustable guard
or envelope, substantially as herein-before described.
Second, the application to the said machinery of a moveable guard plate in
front of the saw, substantially as herein-before described.
Third, the application to such machinery of a sliding gauge or guide piece
for determining the breadth of the wood to be cut, substantially as herein-
before described.
In witness whereof, I, the said Richard Archibald Brooman, have here-
unto set my hand and seal, this Thirtieth day of January One thou-
sand eight hundred and fifty-eight.
R. A. BROOMAN. (L.S.)