IMPROVEMENTS APPLICABLE TO MACHINES FOR Moulding, Cutting, and Setting-out TOOTHED WHEELS
Year: 1875

page_text: LETTERS PATENT to James Cuthbert Scott, of Manchester, in the
County of Lancaster, Engineer, for the Invention of "IMPROVEMENTS
APPLICABLE TO MACHINES FOR Moulding, Cutting, and Setting-out TOOTHED
WHEELS
"
Sealed the 10th March 1876, and dated the 13th September 1875.
PROVISIONAL SPECIFICATION left by the said James Cuthbert Scott
at the Office of the Commissioners of Patents, with his Petition,
on the 13th September 1875.
I, JAMES CUTHBERT SCOTT, of Manchester, in' the County of Lan-
caster, Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS APPLICABLE TO MACHINES FOR MOULDING, CUTTING, AND
SETTING-OUT TOOTHED WHEELS," to be as follows:-
My Invention relates to that part of machines for moulding, cutting,
and setting out, which is usually called the dividing apparatus, and
consists in an arrangement whereby I am enabled to dispense with
change wheels, and to secure increased accuracy of division, To

page_text: accomplish this I cause the handle which gives motion to the movable
part always to start from the same point, and to finish after the required
number of turns have been made against a stop, which is adjustable on
_a_graduated disc, after which it is turned in the reverse direction to its
starting point, and I propose to effect the driving through the inter-
vention of a ratchet wheel or wheels and a click or clicks, so that no
motion is imparted when the handle returns to its starting point.
To illustrate this I will take that arrangement of moulding machine
for which Letters Patent were granted to me dated 15th January 1875,
No. 170. Upon the axis of the driving worm I place a series of clicks
which gear into a like number of ratchet wheels mounted loosely upon
the worm shaft, but fast with the handle by which motion is imparted,
and which handle is capable of being turned into and out of a notch
formed in a disc as usual. Upon this disc which is graduated is a stop.
capable of being adjusted to any of the said graduations, and which
determines the space through which the handle shall be turned, but the
said handle may be moved outward so as to allow it to pass the stop
when more than one revolution is required, and the starting point as
before stated is always the same, the teeth of the ratchet wheels slipping
over the clicks when the backward movement takes place.
In like manner my Invention may be applied to other moulding
machines in which segmental patterns are used, whether the said pattern
or the mould box is caused to move, and it may also be applied to
machines for cutting the teeth of wheels or for setting out what are
-called-pitched-wheels..
...
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Cuthbert Scott in the Great Seal Patent
Office on the 13th March 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
CUTHBERT SCOTT, of Manchester, in the County of Lancaster, Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirteenth day of September, in the
year of our Lord One thousand eight hundred and seventy-five, in the

page_text: thirty-ninth year of Her reign, did for Herself, Her heirs and suc-
cessors, give and grant unto me, the said James Cuthbert Scott, Her
special license that I, the said James Cuthbert Scott, my executors,
administrators, and assigns, or such others as I, the said James.
Cuthbert Scott, my executors, administrators, and assigns, should at
any time agree with, and no others, from time to time and at all
times thereafter during the term therein expressed, should and lawfully.
might make, use, exercise, and vend, within the United Kingdom of
Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "IMPROVEMENTS APPLICABLE TO MACHINES FOR MOULDING,
CUTTING, AND SETTING OUT TOOTHED WHEELS," upon the condition, amongst
others, that I, the said James Cuthbert Scott, by an instrument in
writing under my hand and seal, should particularly describe and ascer-
tain the nature of the said Invention, and in what manner the same was
to be performed, and cause the same to be filed in the Great Seal
Patent Office within six calendar months next and immediately after
the date of the said Letters Patent.
NOW KNOW YE, that I, the said James Cuthbert Scott, do hereby.
declare the nature of my said Invention, and in what manner the
samo is to be performed, to be particularly described and ascertained
in and by the following statement and accompanying Drawings, that is
to say:―
My Invention relates to that part of machines for moulding, cutting,
and setting out toothed wheels which is usually called the dividing
apparatus, and consists in an arrangement whereby I am enabled .to
dispense with change wheels, and to secure an increased accuracy of
division. To accomplish this I cause the handle which gives motion to
the moveable part always to start from the same point, and to finish
after the required number of turns and fraction of a turn have been
effected against an adjustable stop on a graduated disc, after which it is
turned in the reverse direction back to its starting point.
In order to illustrate my Invention I will in the first instance suppose
it to be applied to a moulding machine of that construction for which
Letters Patent were granted to. me, dated Fifteenth January, One
thousand eight hundred and seventy-five, No. 170, Figs. 1, 2, repre-
senting a portion of such machine as shown in the Specification of the
said Patent, a being the worn wheel connected to the trammel, and b

page_text: the worm which drives the said wheel. At c is the handle by which the
said worm is driven, and at d the notched plate into.which the said
handle takes, but-according-to-the usual method this handle drives the
said worm through the medium-of-change-wheels, whereas-according_to_|
my present Invention the said change wheels are dispensed with, and
the handle c and its notched plate are placed direct upon the axis of the
worm, as seen at Figs. 1, 2.
Having thus pointed out the position of the parts which constitute my
Invention, I proceed to shew their construction, referring to the views
upon an enlarged scale, Figs. 3, 4, 5. At e is the fixing attached to the
moulding machine, and which carries the before-mentioned worm
mounted on the shaft 6*. Upon this shaft is mounted loosely a brush 1
provided with a flange 2, which carries the jointed handle c pressed
towards the notched plate d by a spring 3, such plate for the purposes of
my Invention having one notch 4 only. Fast with the brush 1 is
a broad ratchet wheel 5 cut with fine teeth for its whole breadth (say
eight or ten to the inch), and taking into these teeth are two series of
clicks 6, 7, placed as regards their points in advance of the preceeding,
and each one being capable of moving independently of the others upon
axes 8, 9, one end of each of which is carried by a plate 10 fast with the
shaft b*, and the other by a ring 12 mounted loosely within the fixing e.
The clicks 6, 7, are pressed in contact with the ratchet wheel 5 by india-
rubber tubes 12*, 13*, mounted on metal rods or it may be by any other
suitable springs. It will now be seen that when the handle c is turned,
the flange 2 will carry with-it-the-collar 1-and ratchet wheel 5, which
wheel acting as a driver upon the clicks 6, 7, will carry round the axes
8, 9, and consequently the plate.10, which being fast upon the shaft 6*,
the worm-b-will-bo-caused-to-revolve and give motion to the trammel in
the ordinary manner. Upon the edge of the notched plate is a T groove
12, within which is placed a stop 13, and capable of being adjusted in
any required position by means of a tightening screw.
This stop pro-
jects over the edge of the plate d so as to form (when required) a stop
against which the handle c may arrive. The edge of the plate d. is
graduated with fine divisions (see Fig. 3) pointing out (say) the
thousandth part of a circle.
--
The graduations shewn are only few in number, but in practice they
are extended around the circle. In using this dividing apparatus the
handle c always starts from the notch 4, and supposing a number of

page_text: b
whole turns are required, say three, then the handle having been passed
through the necessary space gives the required motion to the worm
through the medium of the ratchet wheel 5 and clicks 6, 7, as above
described, but supposing now that three whole turns and a portion of a
turn are required, then the calculation is made in the ordinary manner
to ascertain what portion of a revolution in addition to the three whole
revolutions is required, and the stop 13 is set upon the plate d by means
of the graduations marked on the said plate d, so that the actual
stopping part will bring the zero mark 14 on the handle c to coincide
with that division of the said graduation which corresponds to the
fraction of a circle through which the handle is to move. This having
been done the handle is turned to the required number of whole
revolutions, being moved outward upon its centre c* to avoid the stop
13, but when these whole revolutions have been made, the handle is not
moved outward but is allowed to arrive in contact with the stop 13,
and then the worm b will have been turned the required distance for
moulding a tooth in the usual manner. When this has been done the
handle c is turned in the reverse direction back to its notch 4, the
ratchet wheel 5 slipping this time over the clicks 6, 7. In order to
prevent any undue motion of the worm 6 a binding screw as at 15 may
be adapted and tightened between each working of the handle c. It
will be seen from the above description that the turning handle c always
starts from the same place, and that it finishes at a stop which may be
adjusted according to the space that the dividing instrument is to pass
through. The stop 13 is jointed as at 16, for the purpose of allowing it
to be turned back out of the way of the handle c should the said stop be
situate within the range of the handle notch 4.
Figs. 6 and 7 shew my Invention adapted to a lathe for cutting
wheels or setting out. Behind the face plate is the worm wheel a
driven as before by the worm b, the handle and notched plate being
shewn at c, d. The part e which carries the worm shaft is mounted in a
slide 17 which may be lowered to disengage the worm 6, when the lathe
is required for ordinary purposes by means of an excentric e*. The
wheel to be cut is placed on the face plate 18 and cut with the slide rest
in the usual manner; Fig. 8 represents my Invention applied to a
trammel for setting out the teeth of wheels or other such purposes.
The trammel is at 19 mounted to turn in any suitable stand, and
carrying the worm wheel a, the other parts are the same as before.

page_text: Fig. 9 represents the Invention applied to an ordinary wheel cutting
machine. At a is the worm wheel before described and mounted upon
an axis which carries the wheel to be cut by the sliding cutter 20.
Having-thus-described-and-ascertained the nature of my said
Invention and the manner in which the same is to be performed, I
desire it to be understood that I do not limit myself to the examples
of the application of my Invention shewn and described, for in the
moulding machine for instance it may be employed in any construction
thereof in which a segmental pattern is used whether such pattern be
caused to rotate or to remain stationary, and the necessary movement
imparted to a mould box or other such apparatus, that which I claim as
my Invention and for the purposes above set forth being the use of the
forward and backward motion of the handle c in combination with the
adjustable stop 13.
In witness whereof, I, the said James Cuthbert Scott, have here- :
unto set my hand and scal, this Eleventh day of March, in the
year of our Lord One thousand eight hundred and seventy-six.