Improvements in Machines or Apparatus for Describing Figures, applicable more especially for use in Making Moulds for Foundry Purposes.
Year: 1890

page_text: Date of Application, 4th Sept., 1890
Complete Specification Left, 3rd June, 1891-Accepted, 4th July, 1891
PROVISIONAL SPECIFICATION.
Improvements in Machines or Apparatus for Describing Figures,
applicable more especially for use in Making Moulds for
Foundry Purposes.
We, JOHN BROAD JACKSON and GEORGE BENTLEY both of Lodge Bank
Works Bury in the County of Lancaster, Engineers, and SAMUEL SMITH of
No. 25 Parker Street Bury in the County of Lancaster, Foreman Pattern Maker,
do hereby declare the nature of this invention to be as follows
This invention has for its object to provide a machine or device by means of
which various figures can be described and it is more especially intended for use for
making moulds for foundry purposes although its use is not limited to that particular
purpose.
We will describe the apparatus as adapted for use in describing at one operation the
figure of a mould for the two parts of a pulley from which description its general
construction for other purposes will likewise be understood. Pulleys or analogous
castings require to be made in halves or separate parts and the apparatus constructed
according to this invention is adapted to describe two semicircles making up the
complete circle of the pulley the said two semi-circles being separated by a space for
being filled in by a core so as to separate the two parts of the mould so that the metal
can be poured into both parts at the same time and then on the core being removed
the two parts so cast are joined together to make the complete pulley. These two
parts and the space for the core are described by one revolution of the apparatus
without moving it from its position.
In an apparatus constructed according to this invention upon a suitable base or
support a spindle is secured and upon this spindle is mounted a disc having therein
a cam groove of the shape of the two semicircles joined by the part which corre-
sponds to the space for the core between them. The arm which carries the tool by
which the mould is formed has its inner end forked or provided with a slot which
embraces the spindle or a collar on it and the said arm is provided with a projection.
preferably consisting of a pin with a roller upon it which enters the cam groove
and when the arm is rotated it follows the cam groove and the tool consequently
describes the figure of the cam groove. The disc is preferably secured to the
spindle by means of a collar and pinching screw engaging in a longitudinal groove
in the spindle so that the disc can be raised or lowered and secured in positions
which are the same relatively to the circumference of the spindle although varying
in height. The inner end of the arm and the cam groove and parts adjacent
thereto can be boxed in to protect them and this can be done by means of a fixed
cover piece and an encircling piece capable of revolving with the arm and having
an opening through which the arm projects. A pin may pass through the arm and
serve to indicate the terminations of the half circles and consequently the position
for the core by engaging in diametrically opposite holes in the box cover.
be understood that by substituting discs with different shaped cam grooves in them
figures other than that mentioned can be described.
Dated this 4th day of September 1890.
It will
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Machines or Apparatus for Describing Figures,
applicable more especially for use in Making Moulds for
Foundry Purposes.
We JoHN BROAD JACKSON and GEORGE BENTLEY both of Lodge Bank
Works Bury in the County of Lancaster Engineers and SAMUEL SMITH of
No. 25 Parker Street Bury in the County of Lancaster Foreman Pattern Maker
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 for its object to provide a machine or device by means of
which various figures can be described and it is more especially intended for use for
making moulds for foundry purposes although its use is not limited to that particular
purpose. We will describe the apparatus with reference to the accompanying
drawings as adapted for use in describing at one operation the figure of a mould for
the two parts of a pulley from which description its general construction for other
purposes will likewise be understood.
Figure 1 shews in vertical section and Figure 2 in plan an apparatus constructed
according to our invention.
Figure 3 shews the guiding or cam groove or matrix and
Figure 4 is a perspective sectional view of a form of the apparatus in operation
upon a mould shewing how the standard may be protruded through the mould.
Pulleys or analogous castings require to be made in halves or separate parts and
the apparatus constructed according to this invention is adapted to describe two
semi-circles making up the complete circle of the pulley the said two semi-circles
being separated by a space for being filled in by a core to separate the two parts of
the mould so that the metal can be poured into both parts at the same time and
then on the core being removed the two parts so cast are joined together to make
the complete pulley. These two parts and the space for the core are described by
one revolution of the apparatus without moving it from its position.
In an apparatus constructed according to this invention upon a suitable base or
support A is secured a spindle 13 and upon this spindle is mounted a dise C having
therein a cam groove of the shape of the two semi-circles joined by a part which
corresponds to the space for the core between them, as shown in the separate view
Figure 3. The arin D which carries the tool by which the mould is formed (or the
tool by which any desired figure is to be described) has its inner end forked as at d
or provided with a slot or hollow boss which embraces the spindle B or a collar on
it, as at E, and the said arm is provided with a projection preferably consisting of
a pin with a roller upon it which enters the cam groove and when the arm D
is rotated it follows the cam groove c' and the tool consequently describes the figure
of the cam groove and forms the required mould or makes the required figure.
The disc C is preferably secured to the spindle B by means of a collar and fixing
screw g² engaging in a longitudinal groove in the spindle so that the disc C and
its adjuncts can be raised or lowered and secured on the spindle in the same positions
relatively to the circumference of the spindle although varying in height. The inner
end of the arm and the cam groove and parts adjacent thereto can be boxed in to
protect them and this can be done by means of a fixed cover piece and an encircling
piece the latter being capable of revolving in the grooves with the arm D and
having an opening through which the sail arm projects. A pin may pass through the
arm as shown at & and serre to indicate the terminations of the half circles, and
consequently the position for the core, by engaging in diametrically opposite holes e
in the disc C. It will be understood that by substituting discs with different shaped
cam grooves in them figures other than that mentioned can be described. Figure 5
for instance is a plan of a disc with a cam groove adapted for forming moulds in
four parts.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The arrangement and combination of parts hereinbefore described and
illustrated in the accompanying drawings constituting the machine or apparatus for
the purposes herein before explained.
2. In machines or apparatus for the purpose described an arm capable of
revolving round a spindle or axis which carries a matrix or cam grooved disc in or
on which runs a projection or roller from the arm substantially as and for the
purposes hereinbefore explained.
T
1001
J. H. JOHNSON & Co.,
Agents.