IMPROVEMENTS IN THE MOUNTING OP BAND SAWS
Year: 1858

page_text: LETTERS PATENT to Henry Wilson, Engineer, in the employment of
Powis and James, of Watling Street, in the City of London, Engineers,
for the Invention of "IMPROVEMENTS IN THE MOUNTING OP BAND SAWS."
Sealed the 22nd February 1859, and dated the 24th August 1858.
PROVISIONAL SPECIFICATION left by the said Henry Wilson at the
Office of the Commissioners of Patents, with his Petition, on the 24th
August 1858.
I, HENRY WILSON, Engineer, in the employment of Powis and James, of
Watling Street, in the City of London, Engineers, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN THE MOUNTING OF BAND
SAWS," to be as follows:-
My Invention is intended to prevent the breaking or snapping of band saws
from any sudden strain or otherwise, while at work, and from the liability to
snap on the cooling of the saws after ceasing to work; also to allow of ready
adjustment of the bearings of the pulleys over which the saws are stretched.
I connect to the bearing of pulley over which the saw is stretched an upright
rod or spindle threaded at top, pass over the thread or upper part one arm-of
a lever, and adjust the spindle to the height required by a nut curved at bottom
to fit any change of position in the lever, and to allow of the adjustment of
the bearing of the pulley. The lever is centred upon a pin supported upon a
pillar. The opposite arm of the lever is connected to a second vertical shaft
or rod, the lower end of which is connected to a vulcanized rubber or other
spring, and is carried down on the outside of the pillar, and is provided with a

page_text: screw adjustment or not, as deemed necessary. The bearing of the pulley
before named being free to move up and down within certain limits, it follows
that upon any strain upon or contraction of the saw, the spring will allow of
the bearing yielding, and thus prevent the snapping of the saw. I do not limit
myself to the precise arrangement of compound lever with screw adjustment
and spring compensation, or either, just described, although I believe it the best
suited to the purposes of my Invention; but I desire also to secure the so con-
necting of the movable bearing of a stretching pulley over which band saws
are stretched to a spring or springs, as will enable the saws to accommodate
themselves to any sudden strain and to contract without snapping.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Henry Wilson in the Great Seal Patent Office on the
24th February 1859.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
WILSON, Engineer, in the employment of Powis and James, of Watling Street,
in the City of London, Engineers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fourth day of August, in the year of our Lord
One thousand eight hundred and fifty-eight, in the twenty-second year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Henry Wilson, Her special licence that I, the said Henry Wilson,
my executors, administrators, and assigns, or such others as I, the said
Henry Wilson, 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
THE MOUNTING OF BAND SAWS," upon the condition (amongst others) that I,
the said Henry Wilson, my executors or administrators, by an instrument
in writing under my, or their, or one of their hands and seals, should par-
ticularly 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 Henry Wilson, do hereby declare the
nature of my said Invention, and in what manner the same is to be per-

page_text: formed, 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:-
My Invention is intended to prevent the breaking or snapping of band saws
from any sudden strain or otherwise, while at work, or from the cooling of the
saws after ceasing to work; also to allow of the ready adjustment of the
bearings of the pulleys over which the saws are stretched.
According to one method of carrying my Invention into effect, I connect to
the bearing of the pulley over which the saw is stretched an upright rod or
spindle threaded at top. Over the thread or upper part of this rod I pass one
arm of a lever, and adjust the rod to the height required by means of a nut
curved at bottom to suit any change of position in the lever, and to allow of
the adjustment of the bearing of the pulley. Between the lever and the nut
I sometimes place a box or other spring. The lever is centered upon a pin
supported upon a pillar. The opposite arm of the lever is connected to a
second vertical rod or spindle, the lower end of which is connected to a
vulcanized rubber or other spring, and is carried down on the outside of the
pillar, and is provided with a screw adjustment or not, as may be deemed
necessary. The bearing of the pulley before named being free to move up and
down within certain limits, it follows that upon any strain upon or contraction
of the saw, the spring will allow of the bearing yielding, and thus prevent the
snapping of the saw.
I do not limit myself to the precise arrangement of compound lever with
screw adjustment and spring compensation, or either, as just described,
although I believe it the best suited to the purposes of my Invention; but I
desire also to secure the so connecting of the movable bearing of a stretching
pulley over which band saws are stretched, to a spring or springs, as to enable
the saws to accommodate themselves to any sudden strain, and to contract
without snapping, whatever may be the particular arrangement of parts
employed.
In the Drawings hereunto annexed I have represented a machine in which
a band saw is mounted according to the method of carrying my Invention into
effect, which I have already described. Figure 1 is a front elevation, and
Figure 2 is a side elevation of the machine. A is the upper band saw pulley,
the bearings of which are bolted to the plate B, which slides up and down in
a dovetailed groove formed on the pillar C; the plate B has formed upon it
the two lugs or projections D, between which is pinned the lower end of the
rod E. The upper end of this rod is screw-threaded, and passes up through
the spring box F, having screwed upon the top of it the pressure wheel G.

page_text: The spring box F, which is shewn in section and enlarged in Figure 3, is
carried by means of the axes H in the end of the beam I, and is fitted with a
The boss on the under side of
helical spring, on which a loose cap K rests.
the wheel G fits into the cap K, and by turning the wheel round upon the
threaded rod E, the movable cover may be pressed down upon the spring, and
the strain upon the band saw be thus adjusted at will. The beam I is carried
by brackets L on top of the pillar C. To the opposite end of it is pinned the
upper end of the rod M. The lower end of this rod is screw-threaded and
passes through a bracket N fastened to the pillar C, and also through a spring
box O, and a pressure wheel P. This spring box and pressure wheel are fitted
similarly, but in a reverse position to those already described. The spring,
however, in this case consists of two rings of vulcanized india-rubber, one
With a
above and one below an iron ring, as shown in section in Figure 4.
machine thus fitted, when any excessive strain comes, however suddenly, upon
the band saw, the springs at the extremities of the rods E and M at once yield
and prevent the breaking of the saw. The strain upon the saw may likewise be
readily adjusted by turning either of the pressure wheels, as already explained.
And having now described the nature of the said Invention, and in what
manner the same may be performed, I declare that I do not confine myself to
the construction or arrangement of all or any of the parts just described, as
they may be varied without departing from my Invention; but I claim,―
First, the method of mounting one or both of the stretching pulleys of band
saws on movable bearings so connected with a spring or springs as to enable
the saws to accommodate themselves to any sudden strain, and to contract
without breaking, and also to enable the strain upon the saws to be readily
adjusted.
Secondly, the method of mounting band saws herein-before particularly
described, and represented in the Drawings hereunto annexed.
In witness whereof, I, the said Henry Wilson, have hereunto set my
hand and seal, this Twenty-fourth day of February, Oue thousand
eight hundred and fifty-nine.
HENRY WILSON. (L.S.)