IMPROVEMENTS IN MACHINES FOR SHARPENING CIRCULAR SAWS
Year: 1885

page_text: I, GILBERT HENRY GARRETT, Works Manager to Messrs L Sterne and Company,
Limited, of the Crown Iron Works, Glasgow, in the County of Lanark, North
Britain, do hereby declare the nature of my said invention for "IMPROVEMENTS IN
MACHINES FOR SHARPENING CIRCULAR SAWS," and in what manner the same is to
he performed, to be particularly described and ascertained in and by the following
statement, that is to say:
My said Invention has for its object to improve the construction of machines for
sharpening circular saws; and a machine as made with my improvements is
delineated on two accompanying sheets of explanatory drawings, figures, 1, 2,
and: 3, on sheet, 1, thereof being respectively a front elevation, a side elevation, and
a back elevation, whilst figure, 4, on sheet, 2, is a plan. In these drawings the
same reference numerals are used to mark the same or like parts wherever they
are repeated..
T
In my improved machine an emery wheel, 5, formed with a bevilled edge, is used
for the sharpening operation, and being fixed on a spindle, 6, having also fast on it.
a driving pulley, 7, is carried at the upper part of a vertical frame, 8, centered at
its lower end. The two sides of the frame, 8, are carried on centre studs, 9, fixed
into two side cheeks, 10, which are cast upon the sole plate, 11, of the machine,
and are connected by a web at their front edges. The frame, 8, can rock on its
centre studs, 9, its outward movement being limited by stops, 12, formed on the
cheeks, 10, and encountered by arms, 13, formed on the arins of the frame and
extending nearly at right angles thereto. The inward movement of the frame, 8,
is limited by stop pins, 14, which are screwed through lugs formed for them on the
cheeks, 10, and which are adjustable. In using the machine, the frame, 8, carrying
the emery wheel, 5, is moved inwards and outwards by the attendant operator by
means of either a vertical handle, 15, at the top of the frame, or a pair of horizontal
handles, 16, projecting from its sides.
The circular saw to be sharpened is placed upon a horizontal carrying arm or
bracket, 17, which is formed with a slot, in which a centre pin, 18, can be adjusted
to suit saws of various diameters the saw being placed with its eye on the centre
pin. The carrying bracket, 17, is attached to a standard, 19, being jointed to the
upper end of a screw spindle, 20, which enters down into a socket in the standard
and is adjustable as to height by means of a screw nut, 21, resting on the top of
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page_text: the standard. The console or downwardly projecting part, 22, of the carrying
bracket, 17, is enlarged at its bottom part and formed with an arc-shaped slot, 23,
through which there projects a screw stud, 24, fitted into a vertical T-shaped
groove in the standard, 19; and a nut on the screw stud, 24, serves for fixing the
carrying bracket, 17, when adjusted to hold the saw in the position to suit the
bevil of the front edges of the teeth. The joint at the top of the screw spindle, 20,
allows of the carrying bracket, 17, being turned about a horizontal axis for the
purpose referred to, whilst the screw stud, 24, is movable vertically in its groove in
the standard to suit the vertical adjustment of the carrying bracket.
The standard, 19, is attached to the sole plate, 11, by a screw bolt, 25, which
serves as a centre about which the bracket can be adjusted to suit the inclination
which the front edges of the saw teeth have to the radii passing through their
points; and when the standard has been so adjusted it is fixed by a screw bolt, 26,
the head of which is movable in an arc-shaped slot formed for it in the sole
plate, 11.
The first-motion shaft, 27, of the machine and which carries the usual fast-and-
loose pulleys, 28, for a driving belt, is partly carried by an outside standard
bearing, 29, and partly in bearings in the cheeks, 10, cast on the sole plate, 11;
whilst between those cheeks it has fast on it a pulley, 30, a belt from which drives
the pulley, 7, fast on the spindle, 6, of the emery wheel, 5.
In sharpening a circular saw by means of the machine, the alternate teeth are
first operated on, the parts carrying the saw being adjusted to suit the outward
inclination or bend of those teeth; and then the adjustment of the carrying
bracket, 17, is reversed, and the remaining teeth are operated on.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I have to state that
I do not restrict myself to the precise details herein described or delineated but
I declare that what I claim is
1―The combination of parts constituting the improved machine for sharpening
circular saws substantially as herein before described and as shown in the accom-
panying drawings.
2-The improved mode of arranging or combining together the parts for
carrying and adjusting the circular saws substantially as hereinbefore described
and as shown in the accompanying drawings.