IMPROVE- MENTS IN SAWS
Year: 1851

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
BARLOW, of Chancery Lane, London, Esquire, send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent, bearing date at Westminster, the Thirty-first day of
July, in the fifteenth year of Her reign, did give and grant unto me, the
said Charles Barlow, my exors, adñññors, and assigns, Her especial license, full
power, sole privilege and authority, that I, the said Charles Barlow, my exors,
adiiors, and assigns, and such others as I, the said Charles Barlow, my
exors, adiñiors, and assigns, should at any time during the continuance of the
said grant at any time agree with, and no others, should and lawfully might
make, use, exercise, and vend, within that part of the United Kingdom of
Great Britain and Ireland called England, the Dominion of Wales, and Town
of Berwick-upon-Tweed, and in the Islands of Jersey, Guernsey, Alderney,
Sark, and Man, and in all Her Majesty's Colonies and Plantations abroad, an
Invention communicated to me by a Foreigner residing abroad, for "IMPROVE-
MENTS IN SAWS;" in which said Letters Patent there is a proviso.obliging
me, the said Charles Barlow, particularly to describe and ascertain the nature
of the said Invention, and in what manner the same is to be performed,
by an instrument in writing under my hand and seal, and to cause the same.
to be enrolled in Her said Majesty's High Court of Chancery within six"

page_text: calendar months from the date of the said grant, as in and by the same,
reference being thereunto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said provisions, I, the said
Charles Barlow, do hereby, declare that I have particularly described and
ascertained the nanner of the said Invention, and in what manner the same
is to be performed, in and by the following, reference being had to the
Drawings annexed, and to the figures and letters marked thereon, that is to
say :-
This Invention relates to an improved mode of forming, arranging, and
combining the teeth of saws of any description, to be used for sawing timber
or other materials. The teeth I employ are of two kinds, viz., fleam teeth,
or teeth having sharp points, and chisel or planing teeth. The fleam teeth
having their points set slightly out from the plate in each direction sideways,
and standing in advance of the edges of the chisel teeth, are for the purpose
of scribing or cutting in two incisions between which the chisel teeth plane
out a shaving, the difference between the operation of saws constructed on
this principle and those of common saws being that the common saw in
cutting makes what is called sawdust, while this makes shavings, clearing
itself at every cut, and therefore working with the smallest possible friction.
.
Fig. 1 is a side view of a mill saw having a curved edge; Fig. 2 is a
side view of another mill saw having a straight edge; Fig. 3 represents part
of 'one of the saws seen in an oblique direction, being on a larger scale than
Figures 1 and 2, for the purpose of showing the form of the teeth; Fig. 4 is
an edge view of the part shown in Figure 3; and Figure 5 is a cross section,
showing the set, of; the teeth. Similar letters of reference indicate corresponding
parts in each of the several Figures. A and B represent the fleam teeth, and
C the chisel or planing teeth. The fleam teeth may be made to stand up.
from the plate in any suitable shape, and are sharpened to points by bevelling
off the opposite sides of the plate to that on which they are intended to cut,
see: Figures 3 and 5, those marked A being bevelled on one side, and those
B.on the opposite side, the points being set slightly outwards to make the saw
plate clear in the cut, see Figure 5. The chisel or planing teeth are or may
be of the form of any ordinary saw tooth having no set. Their chisel points
may be slightly hooked, so as to present their edge at a more acute angle to
the stuff. I have represented in the Drawing what I consider to be the best
mode of arranging the teeth in relation to each other for reciprocating mill
saws, to wit, two fleam teeth and two chisel teeth alternately, except at the
cils of the saw, where I make more fleam teeth. Of each two fleam teeth
above mentioned one is set in cach direction sideways, and of each two

page_text: chisel teeth one is turned in each direction lengthways. This arrangement
of the chisel teeth causes the saw to cut both ways. Though I consider this
the best order of succession for the teeth, I by no means intend to confine
myself to it, as they may be arranged one fleam and one chisel tooth alter-
nately, or in various other ways, still producing the same effect. The im-
provement is applicable to saws having their edges straight, or of any other
form, and also to saws which cut only one way, the difference in that case
being that the chisel teeth should be all turned in one direction. The saw
will make a cleaner cut than the common saw, and may be worked by less
power, as it will work more steadily from the absence of anything like tearing
or jagging, the fleam teeth being always in advance of the chisel or planing
teeth, making or cutting the width of their shavings.
What I claim is, the combination in the same saw of fleam teeth A and B,
and chisel teeth C, substantially as herein described.
In witness whereof, I, the said Charles Barlow, have hereunto set my
hand and seal, the Thirty-first day of January, in the year of our Lord
One thousand eight hundred and fifty-two.