Improvements in Multiple Saw Frames.
Year: 1890

page_text: Date of Application, 30th Apr., 1890
Complete Specification Left, 19th Feb., 1891-Accepted, 21st Mar., 1891
PROVISIONAL SPECIFICATION.
[Communicated from abroad by ANTOINE JEANSAUME, of No. 6, Boulevard de
Strasbourg, Paris, Engineer.]
Improvements in Multiple Saw Frames.
1, HENRY HARINGTON LEIGH, Fel. Inst. P.A., Assoc. Mem. Inst. C.E.,
practising as Phillips & Leigh, at No. 22, Southampton Buildings, Chancery Lane,
London, W.C., Engineer and Patent Agent, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in multiple saw, frames, and consists in
replacing the well known alternating saws by band saws.
The advantages of a band saw, ie., one with a continuous action, over an alter-
nating saw, ie., one which cuts on one stroke only are well known. Up to the
present time, however, it has been found impracticable to use multiple band saws
for sawing a trunk up into planks simultaneously. The reason of this has been
the impossibility of fitting more than one band on the pulley so as to make them
present their cutting edges fairly to the end of the trunk. It has been proposed
to use stepped pulleys, but even then the several saws would be in different planes,
and running at different speeds, with the result of inferior work; and, as such a
pulley would not be made in one piece, it would be necessary to change it every
time it was required to vary the thickness of the planks.
In carrying my invention into effect, I provide two parrallel drums of a length
proportional to the number and width of the saws, and lead the latter around both
drums.
As the trunk lies horizontally, the drums must be vertical. The bands would
then present their sides, and not their teeth, to the work; and to bring them into
working position as they pass the trunk, I provide grooved pulleys, or their
equivalents, adapted to embrace the bands and twist them through the necessary
angle. I do not confine myself to the number of grooved pulleys which I make nse
of, and may vary their position as required to produce the best result.
Dated this 20th day of 1900
HENRY H. LEIGH.
COMPLETE SPECIFICATION.
Improvements in Multiple Saw Frames.
HENRY HARINGTON LEIGH, Fel. Inst. P.A., Assoc. Mem. Inst. C.E.,
trading as Phillips & Leigh, at No. 22, Southampton Buildings, Chancery Lane,
London, W.C., Engineer and Patent Agent, do hereby declare the nature of this
invention, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
This invention relates to improvements in multiple saw frames, and consists in
replacing the well known alternating saws by band saws.
The advantages of a band saw, ie., one with a continuous action, over an alter-
nating saw, ie, one which cuts on one stroke only, are well known, and may be
summed up as a continuous cut on the part of a band saw against a cut about a
third the stroke of the alternating saw. Up to the present time, however, it
has been found impracticable to use multiple band saws for sawing, say, a
trunk up into planks or a block of marble up into slabs, simultaneously. The
reason of this has been the impossibility of fitting more than one band on the pulley
so as to make them present their cutting edges fairly to the ends of the trunk
ED
21

page_text: or block. It has been proposed to use stepped pulleys, but even then the
several saws would be in different planes, and running at different speeds, with the
result of inferior work, and, as such a pulley would not be made in one piece, it
would be necessary to change it every time it was required to vary the thickness
of the planks.
In carrying my invention into effect, I provide two parallel drums of a length
proportional to the number and width of the saws, and lead the latter around
both drums.
As the trunk lies horizontally, the drums must be vertical. The band, would
then present their sides, and not their teeth to the work; and to bring them into
working position as they pass the trunk, provide grooved pulleys, or their
equivalents, adapted to embrace the bands and twist them through the necessary
angle, which may vary from 10° up to 90º. I do not confine myself to the number
of grooved pulleys which I make use of, and may vary their position as required to
produce the best result.
In order that my invention and the means by which the same is to be carried
into practical effect may be thoroughly understood, I will now describe them in
detail, referring in so doing to the accompanying drawings which are to be taken
as part of the Specification and read therewith.
Figure is a side elevation illustrating the embodiment of my invention.
Figures 2 and 3 are details illustrating the arrangement of the grooved retaining
pulleys.
A, Aare a pair of parallel pulleys such as are ordinarily used to carry hand
saws. They are mounted upon, and have their axes on standards or other
equivalent. Suitable means, eg. a winch handle, are provided for driving them.
Cis a band saw carried by the pulleys A, A in the ordinary way,
D, D are the grooved pulleys.
These pulleys are adjustably supported in their respective working positions in
any convenient way. They are, as shown in Figures and 3, arranged in pairs,
one pair on each side or at each end of the work. Each pulley D has a guiding
groove dent in its periphery of a proper size to receive the saw, and it is the
function of these grooves to retain the cutting portion of the saw in the cutting
plane in the manner described above. The figures shew them as holding it at an
angle of 90° as compared with the non-entting portion.
Although only two carrying pulleys & are shown on Figure 1. I wish it to be
distinctly understood that my invention does not confine me in this respect,
inasmuch as may arrange inore than one upon the same axis, side by side,
necording to the number of saws in the frame, it being noted that all the saws with
the exception of their respective cutting portions move in the same planes. The
installation illustrated may be regarded as simple an embodiment of my invention
as it is capable of, and which may be modified or amplified as may be required.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, 1 declare that
what claim is :-
1. A band saw carried by a pulley and as to its cutting portion retained in the
cutting position by grooved pulleys, as set forth.
2. Band saws carried by pulleys in one and the same plane and retained as to
their cutting portions in the cutting positions by grooved pulleys, as set forth.
3. The combination of band saws and grooved retaining pulleys.
ليمى
" Palm 1901
HENRY H. LEIGH.