Improvements in or Connected with Tubular Saws.
Year: 1888

page_text: Date of Application, 14th Aug., 1888
Complete Specification Left, 14th May, 1889-Accepted, 29th June, 1889
PROVISIONAL SPECIFICATION.
Improvements in or Connected with Tubular Saws.
We, THOMAS HOWE, Joiner, and MARY HOWE, Wife of the said Thomas Howe
both of 48 Brook Street, Saint Helens, in the County of Lancaster, do hereby
declare the nature of our said invention to be as follows:-
:
Our invention has reference to that class of saws which are of tubular or cylindrical
form to be used for cutting channels, gutters, or grooves of circular form in wood, for
example, in the cutting of wood to form rain or water gutters for roofs of buildings.
Saws of this kind, have, prior to our invention been driven by friction strap gear.
According to our invention we drive a tubular saw by a positive gearing this we
obtain by providing slots or teeth in the shell of the saw, into which a toothed wheel
will gear, thus the saw has a plain shell surface and will pass and clear the wood as it
cuts it. The tube, round one edge of which the saw teeth are cut, is carried in a
semi-circular bearing and is kept in place by rollers which bear on the under side of
the inner face of the tube. Anti-friction rollers or ball bearings may be provided to
reduce the friction, and the rollers may be provided with india rubber rings to form
an elastic bearing for the saw. The wood to be cut or grooved, is fed and held by
rollers to, and past, the saw-the groove being cut as the wood travels.
Dated this 13th day of August 1888.
THOMAS HOWE.
MARY HOWE.
By Cheesbrough & Royston,
Agents.
COMPLETE SPECIFICATION.
Improvements in or Connected with Tubular Saws.
We, THOMAS Howe, Joiner, and MARY HOWE, both of 48, Brook Street, Saint
Helens, in the County of Lancaster, do hereby declare the nature of our said inven-
tion and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
Our Invention has reference to that class of saws which are of tubular or cylindrical
form, to be used for cutting channels, gutters, or grooves of circular form in wood,
for example, in the cutting of wood to form. rain or water gutters for roofs of
buildings. Saws of this kind have, prior to our invention, been driven by friction
strap gear. According to our invention we drive a tubular saw by a positive gearing:
this we obtain by providing slots or teeth in the shell of the saw, into which a
toothed wheel will gear, thus the saw has a plain shell surface and-will-pass and clear
the wood as it cuts it. The tube, round one edge of which the saw teeth are cut, is
carried in a semi-circular bearing and is kept in place by rollers which bear on the
under side of the inner face of the tube. Anti friction rollers or ball bearings
may be provided to reduce the friction, and the rollers may be provided with
The wood to be cut
india-rubber rings to form an elastic bearing for the saw.
or grooved, is fed and held by rollers to, and past, the saw-the groove being
cut as the wood travels. The wood can be cut in the form of an ornamental
gutter, by cutting the corner out. The corner piece cut ont can then he added to
the gutter.
The annexed drawings which form a part of this specification, and the description
of them set forth together a construction and arrangement of tubular saw with the
improvements according to this invention applied thereto,

page_text: DESCRIPTION OF THE DRAWINGS.
Figure 1 is an end elevation of a tubular saw and frame constructed and arranged
according to this invention.
Figure 2 is a side elevation of the saw and frame, shown in section at the line XX
Figure 1.
Figure 3 is a plan of the saw and frame; in this Figure the saw is brought
forward, to shew the rollers.
.
Figures 4 and 5 show sections of ornamental gutters, cut by the saw.
A is the saw which is of tubular form. According to our invention we provide
the saw with slots or teeth a, cut round the shell by preference in a double row,
these slots or teeth are cut in the shell of the saw and are made to fit and gear onto
the teeth b of a toothed wheel B, the wheel having a groove b¹ to take the bar a¹
which divides the slots a of the saw A. The tubular saw A is carried and runs in a
semi-circular bearing C, formed in a frame D. The saw A is kept in its place by the
three rollers d which are carried by and run in bearings e which are carried by, and
adjustable on the frame D by means of the screwed shanks fand' nuts g. The
rollers d are provided with india-rubber or other elastic rings d¹ to form an elastic
bearing for the saw.
As will be understood, the saw and frame above described can be mounted on any
suitable kind of bench, and the wheel B driven by any suitable gearing, and provided
with a suitable "saw feed." The saw A has a plain shell surface and is driven by a
positive gearing a b and it will pass and clear the wood as it cuts it. The saw is
particularly suitable for cutting the groove in gutters as illustrated in Figures 4
and 5 for example the saw will cut the groove which forms the channel and then
can cut off the corner as shown at i (see Figure 4), the piece i¹ cut out can then be
added to the gutter as shown at Figure 5.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
1. Effecting the rotation of tubular saws by positive gearing; substantially as
set forth.
2. In sawing apparatus, the combination of a tubular saw, provided with slots or
teeth in or on the shell thereof, and a toothed wheel or wheels adapted to gear into
said slots or with said teeth and to drive the saw.
3. A tubular sawing apparatus comprising a tubular saw A, having slots or teeth a,
a frame D, having a semi-circular bearing in which the saw runs, rollers d to keep
the saw in position, and a toothed wheel B to drive the saw; constructed and
arranged as set forth.
Dated this 13th day of May 1889.
CHEESBROUGH & ROYSTON,
15, Water Street, Liverpool, Agents for the Applicants.