Improvements in or relating to Tool Grinding Machines.
Year: 1895

page_text: Date of Application, 26th Nov., 1895
Complete Specification Left. 26th Aug.. 1896-Accented 10th Oct. 1896
PROVISIONAL SPECIFICATION.
Improvements in or relating to Tool Grinding Machines.
We, CHARLES HENRY DALE and FREDERICK JAMES DALE trading as
H. & F. Dale, Newarke Street, Leicester, Engineers do hereby declare the nature
of this invention to be as follows:-
This invention has reference to tool grinding machines and embodies improve-
ments in tool holding mechanism to be employed therewith for the purpose of
presenting the tool to the emery or other grinding disc or stone hereinafter referred
to as the grinding disc.
The said mechanism is designed more especially for presenting the rotary cutters
of boot heel paring machines to the grinding disc, but is also applicable for use
with tools of other kinds.
The tool holding mechanism constructed in accordance with this invention is
provided with the fullest possible scope of adjustability and includes within its
range, means for enabling the tool to be presented to the grinding disc at any
required angle as well as to be raised or lowered or moved to or fro relatively
thereto.
The said mechanism comprises in its construction, jays for holding the said tool,
one or each of which may be adjustable relatively to the other and provided if
desired with projections or recesses corresponding to those on the tool to be
ground.
The said jaws are adjustably connected to a carrier plate by one or more
clamping screws, which allow of the position of the said jaws being varied
relatively to the axis of the grinding disc so as to present the edge of the tool
at any desired angle to the acting face or the peripheral edge of the said
grinding disc.
The said carrier plate may be pivotted to an arm the boss of which is free to
move to and fro on a spindle and thus traverse the tool across the said face or edge
of the grinding disc.
The said tool will thus be moved to and fro in a line either transverse or parallel
to the axis of the grinding disc according to whether the periphery or face of the
latter is being used for grinding purposes.
To vary the bevel or chamfer of the edge of the tool being ground, the said
carrier plate may be provided with a curved slot and clamping screw or equivalent
neans which permits of it being adjusted in an arc of a circle relatively to the edge
or face of the grinding disc.
The before mentioned spindle may be supported at each end in a bracket one
part of which is slidable within the other part to raise or lower the tool relatively
to the grinding disc and the lower part of the bracket is slidable on an arm or
equivalent means so as to permit of the tool holding mechanism being moved to and
fro relatively to the grinding disc for varying diameters of the latter and different
lengths of tools required to be ground.
Means are also employed in combination with the jaws to insure that each knife
or tool be ground to the same extent as regards width or length.
This is an essential feature in rotary cutters such as before mentioned to obtain
even and uniform motion of the cutter bead.
Dated this 25th day of November 1895.
BOULT & WADE,
Agents for the Applicants.

page_text: Improvements in or relating to Tool Grinding Machines.
We, CHARLES HENRY DALE and FREDERICK JAMES DALE trading as
H. & F. Dale, Newarke Street, Leicester, Engineers, 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 has reference to tool grinding machines and embodies improve-
ments in tool holding mechanism to be employed therewith for the purpose of
presenting the tool to the emery or other grinding disc or stone hereinafter referred
to as the grinding disc.
The said mechanism is designed more especially for presenting the rotary cutters
of boot heel paring machines to the grinding disc, but is also applicable for use with
tools of other kinds.
The tool holding mechanism constructed in accordance with this invention is
provided with the fullest possible scope of adjustability and includes within its
range, means for enabling the tool to be presented to the grinding disc at any
required angle as well as to be raised or lowered or moved to or fro relatively
thereto.
The invention will be fully understood in reference to the accompanying drawings
and the following further description.
Figure 1 is a side elevation and Figure 2 a plan of the adjustable tool holding
mechanism constituting our invention and illustrated in its application to a grinding
machine.
Figures 3 and 3 are elevation and plan respectively of one of the tool holding
jaws hereinafter referred to.
Only so much of the grinding machine is shown in the drawings and will be
hereinafter described as is necessary to clearly illustrate the invention.
Like letters of reference indicate similar parts in each of the figures.
A represents a grinding disc mounted on a shaft A' which may be provided with
fast and loose pulleys in the well known manner.
A 2 is the standard of the grinding machine aud A 3 an ordinary trough of
any suitable construction attached either to the standard or on the shaft A 1 as may
be convenient.
B represents one of a series (usually three) of blades (hereinafter referred to
as the tool) forming the rotary cutter of a boot heel paring or trimming machine.
CCI are the two jaws between which the said tool is held and which may be
adjustable the one relatively to the other.
In the present construction the jaw C is formed as an integral part of a plate C2
while the other jaw C1 shown detached in Figures 3 and 34 is made adjustable,
being removable from and connected to the plate C 2 by a clamping screw C3
which passes through a hole C 3 in the jaw and when tightened in position holds
the tool firmly between the two jaws.
A screw C6 passing through a hole C 6 in the jaw C1 and entering a recess in
the plate C2 prevents the jaw rotating on the clamping screw C 3 when the latter
is partly withdrawn.
Each jaw is provided with recesses C4 and projections C5 corresponding with
projections and recesses on the tool to be ground.
The jaws are attached to a carrier plate D by a screw D1 which (when partly
withdrawn) forms a centre upon which the jaws may be partly rotated to vary their
positions relatively to the grinding disc to permit of the presentation of the edge
of the tool B at any desired angle to the acting face or the peripheral edge of the
grinding disc.
The said carrier plate is pivotted at D 2 to an arm E the boss E1 Figure 2 of

page_text: which may be mounted on a spindle F and be free to move to and fro thereon an
thus traverse the tool B across the face or edge of the grinding disc.
The said spindle is supported in bracket bearings GI G 2 but instead of rigidly
securing the spindle in the brackets, we prefer to mount it loosely therein and
secure the boss E1 of the arm E to the said spindle by a screw E 2 or other means
and by connecting a disc F 1, one to each end of the spindle, the latter can be more
easily moved to and fro in its bearings and the tool across the edge of the grinding
disc as before described.
The said tool will thus have a movement in a line which is either transverse or
parallel to the axis of the grinding disc according to whether the periphery or face
of the latter is being used for grinding purposes.
A set screw K provided with a lock nut K1 and passing through each of the
bearings G1 G2 is employed to limit the movement of the boss El and spindle F
and prevent the tool passing over the edge of the grinding disc A in either direction..
In order to vary the bevel or chamfer of the cutting edge of the tool, provision
is made for adjusting the carrier plate in an arc of a circle relatively to the edge
or face of the grinding disc.
This is effected by constructing the carrier plate with a rearward extension D 3
in which is a curved slot D4 through which a wing headed screw bolt D 5 passes
into the upward continuation E 3 of the arm E.
Upon releasing the said screw bolt B5 the carrier plate is freely movable on its
pivot D2 in an arc of a circle within the limits of the slot D 4 so that the edge of
the tool may be ground to a more or less acute angle as desired.
This angle having been found an adjusting screw H 1 passing through the jaw C
and on to a rest H may be turned in one or the other direction until the edge of the
knife rests on the grinding disc.
The tool is then moved to and fro across the grinding disc until the required.
amount has been ground off it, when it may be removed from the jaws and every
subsequent tool which is placed in the jaws will be ground to the same extent
and to the same angle while the position of the adjusting screw remains unaltered.
The rest H is connected to a slotted plate L by a screw bolt L 1 passing
through them and provided with a wing nut L 2 on its end by which it can be fixed.
in position.
The plate L is connected to the trough A 3 by a thumbscrew L 3.
In order that the tool holding mechanism may be raised or lowered relatively to
the grinding disc, which may be requisite with tools of varying shapes, the spindle
supporting bracket is formed in two parts G 3 G 4 one of which is slidable within
the other.
The two parts are connected together by a screw bolt G 5 passing through slots
therein and a wing nut G 6 tightened on the end of the bolt.
Upon releasing the said nut the inner plate G3 can be raised as shown in
Figure 1.
A boss or sleeve G 7 formed as an integral part G4 of the bracket is
movable to and fro on an arm J so that the tool holding mechanism may be
adjustable for varying diameters of grinding discs and different lengths of tools to
be ground.
The arm may be secured to the trough A 3 by screw bolts J1 and the boss be
rigidly secured by a set screw J2 in position thereon. It is obvious that tool
holding mechanism, capable of universal adjustment i.e. of being moved to or fro,
and up or down and in an arc of a circle relatively to the grinding disc as
hereinbefore described is adapted to present the tool at any required angle or
position to the grinding disc.
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 :-
1. In tool holding mechanism for grinding machines the combination of two jaws

page_text: adjustable the one relatively to the other, a carrier plate to which the said jaws are
adjustably attached and means to allow the said carrier plate being adjusted in an
arc of a circle relatively to the face or edge of the grinding disc substantially as
and for the purpose described.
2. In tool holding mechanism for grinding machines, the combination of jaws
adjustable the one relatively to the other, a carrier plate to which the said jaws
are adjustably attached, an arm connected to the said carrier plate, and movable to
and fro on a spindle to traverse the tool across the grinding disc substantially as
and for the purpose described.
3. In tool holding mechanism for grinding machines the combination of adjustable
jaws, a carrier plate for the said jaws adjustable in an arc of a circle, and au arm
connected to the said carrier plate and movable to and fro on a spindle in a direction
either transverse or parallel to the axis of the grinding disc substantially as and
for the purpose described.
4. In tool holding mechanism for grinding machines the combination of adjustable
jaws, a carrier plate for the said jaws, an arm connected to the said carrier plate
and movable to and fro to traverse the tool across the grinding disc and a supporting
bracket for the said arm capable of being raised and lowered substantially as and
for the purpose described.
5. In tool holding mechanism for grinding machines the combination of adjustable
jaws, a carrier plate therefor, an arm attached thereto capable of being moved to
and fro in a line parallel with the acting face of the grinding disc and attached also
to a bracket capable of being raised or lowered or moved to and fro relative to the
grinding disc substantially as and for the purpose described.
6. In tool holding mechanism for grinding machines the combination of adjustable
jaws, adjustable carrier plate, traversable arm, slidable bracket and supporting arm
substantially as described.
7. The universally adjustable tool holding mechanism for grinding machines
consisting of the parts constructed, arranged and operating substantially as described
and illustrated in the accompanying drawings.
Dated this 21st day of August 1896.
FREDERICK JAMES DALE.
Boult & Wade,
Agents for the Applicants.