Improvements in or connected with Band Saw Guides.
Year: 1890

page_text: Date of Application, 2nd Apr., 1890
Complete Specification Left, 2nd Jan., 1891-Accepted, 28th Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in or connected with Band Saw Guides.
We, JONATHAN PLUMRIDGE, Senior, Saw Mills Proprietor, JONATHAN
PLUMRIDGE, Junior, Manager, both of Denmark Street and Desborough Road,
High Wycombe, in the County of Buckingham, and SPENCER JACKSON, Engineer,
of Chinnor, Tetsworth, in the County of Oxford, do hereby declare the nature of
this invention to be as follows:-
This invention relates to improvements in, or connected with, band saw guides,
and has for its object to guide the saw more truly, and with less friction than
heretofore.
For this purpose, we employ an arm or bracket, which is mounted on the machine
with capability of vertical and horizontal adjustment to accommodate the varying
thicknesses of the work, or width of saws employed, and upon the end of the
bracket or arm, we form a head provided with projecting screw studs or bolts.
In the face of the head, we form a recess, within which is placed a disc of
hardened steel provided with an annular groove in the face thereof, and mounted
with capability of revolution upon a stud or axis, and at the back of the recess is a
fixed disc or plate formed with a corresponding annular groove in the face thereof,
and within the two annular grooves and between the discs are located a number of
anti-friction balls or rollers.
In the face of the head, above and below the loose disc, and near to one edge
thereof, we form grooves to receive the back of the saw, and permit it to rest
against, and run in contact with, the loose disc, which constitutes a guide in that
direction, and in order to guide and support the saw laterally, we employ two
wooden guide blocks, which are, in their outer edges, provided with open-ended
slots to receive the screw studs or bolts of the head, and permit of adjustment for
different thicknesses of saws.
The wooden guide blocks are securely clamped to the face of the head with the
saw between their inner edges by means of nuts screwing on to the studs or bolts,
and in order that the wooden blocks may form an efficient guide, they are, when
commencing work, set up as tightly as possible, leaving the saw to form for itself a
smooth chase between them.
In lieu of employing loose anti-friction balls or rollers running in a groove or
chase formed partly in each disc as hereinbefore described, in order to support the
revolving disc, we may dispense with such balls or rollers and groove or chase and
employ an anti-friction wheel or roller mounted with capability of revolution upon
an axis arranged at right angles to the axis of the revolving disc and immediately
at the rear thereof and in or near the same vertical plane as the saw.
Dated this 2nd day of April 1890.
VAUGHAN & SON,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in or connected with Band Saw Guides.
We, JONATHAN PLUMRIDGE, Senior, Saw Mills Proprietor, JONATHAN
PLUMRIDGE, Junior, Manager, both of Denmark Street and Desborough Road,
High Wycombe, in the County of Buckingham, and SPENCER JACKSON, Engineer,
of Chinnor, Tetsworth, in the County of Oxford, do hereby declare the nature of
Price 8d l

page_text: this invention, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
Our said invention relates to improvements in, or connected with, band saw guides,
and has for its object, to guide the saw more truly, and with less friction, than
heretofore.
For this purpose, we employ an arm or bracket, which is mounted on the
machine with capability of vertical or horizontal adjustment to accommodate the
varying thicknesses of the work, or width of saws employed, and upon the end of
the arm or bracket, we form a head.
In the face of the head, we form a recess, within which is placed a disc of
hardened steel mounted with capability of revolution upon a stud or axis, or, it
may be fixed upon its axis, in which case, the latter is arranged to revolve within a
socket or other bearing.
In order that the said disc, or the disc and its axis may revolve truly, we arrange
within the said recess some suitable anti-frictional device, such as a number of balls
or rollers, or a wheel or roller having an axis at right angles to that of the disc, the
said device being so arranged that it will prevent the pressure of the saw blade from
forcing the disc, or disc and axis out of proper alignment.
When the anti-frictional device, employed as lastly stated, consists of a number
of balls or rollers, we fix at the back of the recess, a disc or plate formed with an
annular groove, and on the inner face of the loose disc, we form a corresponding
annular groove, the balls or rollers being situated within the groove or chase formed
by the two annular grooves.
When a wheel or roller is employed as an anti-frictional device, the same is
mounted upon an axis at right angles to the axis of the disc, with capability of
revolution, and it is so arranged within the recess, that it will be in or near the
same vertical plane as the saw blade.
In the face of the head, above and below the loose disc, and near to one edge
thereof, we form grooves to receive the back of the saw, and permit it to rest against,
and run in contact with, the disc, which constitutes a guide in that direction, and,
in order to guide and support the saw laterally, we employ two wooden guide blocks,
which are, in their outer edges, provided with open ended slots to receive the
clamping plates and guide plates or studs of the head and permit of adjustment for
different thicknesses of saws.
One of the said wooden guide blocks is securely clamped to the face of the head,
and the second block is so mounted that its position can be adjusted by a screw
projecting through an arm carried by the before mentioned bracket in order that the
said blocks may form an efficient guide.
We will now proceed to refer to the accompanying drawings from which the
nature of our said invention will be more clearly understood.
The same letters of reference indicate like parts in all the figures.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a front view of a band saw guide constructed in accordance with this
invention.
Figure 2 is a like view with the two wooden guide blocks removed, and,
Figure 3 is a vertical section taken on the line 1-1 Figure 1.
In the arrangement represented at Figures 1, 2, and 3, the anti-frictional device
consists of a number of balls arranged within the annular grooves in the two
metal discs.
Figure 4 is a horizontal section of a band saw guide constructed in accordance
with this invention, in which, a wheel or roller, arranged as hereinbefore described,
is employed as an anti-frictional device.
Figure 5 is a similar view to Figure 4, but showing a slight modification in the
method of mounting the disc.
Referring to Figures 1, 2, and 3, a is the before mentioned arm or bracket of the

page_text: machine, is the head of the guide and is the recess formed in the face thereof;:
the disc is illustrated as being mounted loosely on the axis c', which, if desired,
may be made capable of being tightened up to compensate for any wear in the
frictional devices or bearing surfaces, but the disc c may be fixed on its axis, as
hereinafter described. is the disc or plate fixed at the back of the recess 7,
cc are the annular grooves in the discs cc, and d are the balls against which the
disc c revolves.
E E are
clamping devices projecting from the head which serve to clamp the
two wooden guide blocks ff; e is the screw for adjusting the position of the
block feare guide plates, or they might be studs which take into the lower
slots of the guide blocks ff. G is the saw blade. The face of the head bis
cut down at 6 to allow of the escape of dust. The face of the disc c may be recessed
in the centre as illustrated.
In the arrangement represented at Figure 4, an anti-frictional wheel or roller d
is substituted for the loose balls and is located in alignment with the saw blade G
and so that the inner face of the disc c bears against the periphery thereof.
In the arrangement represented at Figure 5 the disc c is fixed in relation to the
stud or axis c¹ and the latter fits with capability of freely revolving in a socket or
bearing & formed in the head b, but otherwise the parts are similar to those lastly
hereinbefore described.
On the saw blade being caused to travel, it will, by the assistance of the material
being acted upon, be pressed back on the disc c which revolves loosely on, or with,
its axis c' against the anti-frictional device, which affords it the necessary support
at that point where it takes the pressure of the saw, thereby greatly reducing
the friction of the parts and the wearing action of the back of the saw on the
guide.
We are aware that it has been, prior to the date of our present invention, proposed
to employ a disc so that the back of the saw blade takes its bearing against the peri-
phery thereof, but a disc so employed was not a practical success; we are also aware
that it has been suggested to guide the blade of a band saw by causing the back thereof
to bear against the face of a disc, so arranged as to be capable of revolution, but
the pressure of the saw blade against the face of the disc, at one side, tends to
cause the disc to be forced out of its proper alignment, the consequence being that
the disc is not only prevented from revolving freely, but is, after a time, rendered
useless owing to the uneven wear of the centre of the disc or of the axis
thereof.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:-
:-
In a band saw guide, the combination with a revolving disc of an anti-frictional
device arranged in manner substantially as herein shown and described and for the
purpose stated.
VAUGHAN & SON,
Agents for the Applicants.