IMPROVEMENTS IN MOULDING APPARATUS FOR CASTING SCREWS
Year: 1881

page_text: LETTERS PATENT to William Allen Ingalls, of Providence, Rhode Island,
United States of America, but at present of No. 26, Sackville Street, in the
County of Middlesex, for an Invention of "IMPROVEMENTS IN MOULDING
APPARATUS FOR CASTING SCREWS."
PROVISIONAL SPECIFICATION left by the said William Allen Ingalls at the
Office of the Commissioners of Patents on the 1st March 1881.
"
WILLIAM ALLEN INGALLS, of Providence, Rhode Island, United States of America,
but at present of No. 26, Sackville Street, in the County of Middlesex.
'IMPROVEMENTS IN MOULDING APPARATUS FOR CASTING SCREWS."
My Invention relates to method of casting screws, wherein the screw pattern
is screwed into and out of the mould box through the mould board, so that after
the mould box has been rammed the pattern is removed by screwing it out through
the mould board, thus forming the complete mould for the screw without any
parting of the mould box. In constructing apparatus for this purpose I provide
on the outer face of the mould board a screw nut, by preference divided into two
halves, which are pivotted together on one side, while on the other side they have
forks fitting round a screw by means of a thumb nut, on which they are nipped
when in their closed position embracing the screw pattern, which is consequently
screwed into and out of the mould box through the said nut. Between the inner
face of the nut and the inner face of the mould board is formed a chamber, through
which the screw pattern passes freely, so that any particles of sand that may
adhere to the screw pattern as it is screwed out of the mould box can fall off into
such chamber, and are thus prevented from entering the screw nut with the
pattern, whereby the wearing away of the pattern and nut by friction caused by
particles of sand between them is prevented. In order to allow any particles of
sand that may nevertheless enter the nut with the pattern to escape without
[Price Gd

page_text: passing through the whole of the screw threads thereof, the two half nuts are so
formed that they do not fit closely together, a narrow space being made to
intervene between their meeting faces, into which space such particles of sand
escape. The said screw nut may also be made in one piece, with one or more
longitudinal grooves in the thread for the particles of sand to escape into, but I
prefer to make it in two opening halves as described, as by this means when it is
desired to introduce the screw pattern into the mould box again for forming
another mould, I am enabled by opening the screw nut to slide in the screw
pattern longitudinally through the chamber in the mould until it is in proper
position, and then to close the nut upon it, by which means the loss of time and
wear of the parts in screwing in the pattern through a solid nut would be prevented.
The before described chamber intervening between the nut and the sand in the
mould box is by preference formed in a collar or piece separate from the mould
board, and secured thereto in any convenient manner.
When using the said moulding apparatus for forming the screws for lifting jacks,
having a head at one end with holes through it for receiving the turning bar, I
arrange the same as follows:-The pattern for the head is divided transversely
into two parts; the one part next the screw is fitted against the inner face of the
before described mould board, and has a hole through it for the screw pattern to
pass through, and it also has four opposite semi circular lugs for the core-prints for
receiving the cores that form the holes of the head. After ramming this half
pattern together with that of the screw the mould board is removed, leaving the
half pattern of the head in the box; the second half pattern is then fitted on to it,
for which purpose the one half has pins fitting holes on the other part, and the
second half of the pattern is rammed in a separate box. This is then taken off, and
after removing the patterns of the head, a cross shaped core for the holes is placed
in the core prints of the head, and on replacing the mould of the second half of the
head the screw is cast.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Allen Ingalls in the Great Seal Patent Office on the
29th August 1881.
WILLIAM ALLEN INGALLS, of Providence, Rhode Island, United States of America,
but at present of No. 26, Sackville Street, in the County of Middlesex.
"IMPROVEMENTS IN MOULDING APPARATUS FOR CASTING SCREWS."
My Invention relates to a method of casting screws wherein the screw pattern is
screwed into and out of the mould box through the mould board, so that after the
mould box has been rammed the pattern is removed by screwing it out through
the mould board, thus forming the complete mould for the screw without any
parting of the mould box. In constructing apparatus for this purpose I provide on
the outer face of the mould board a screw nut, by preference divided into two
halves, which are pivotted together on one side, while on the other side they have
forks fitting round a screw by means of a thumb nut on which they are nipped
when in their closed position, embracing the screw pattern, which is consequently
screwed into and out of the mould box through the said nut. Between the inner
face of the nut and the inner face of the mould board is formed a chamber through
which the screw pattern passes freely, so that any particles of sand that may adhere
to the screw pattern as it is screwed out of the mould box can fall off into such
chamber, and are thus prevented from entering the screw nut with the pattern,
whereby the wearing away of the pattern and nut by the friction caused by
particles of sand between them is prevented. In order to allow any particles of
sand that may nevertheless enter the nut with the pattern to escape without
passing through the whole of the screw threads thereof, the two half nuts are so
formed that they do not fit closely together, a narrow space being made to intervene
between their meeting faces, into which space such particles of sand escape. The
said screw nut may also be made in one piece with one or more longitudinal
grooves in the thread for the particles of sand to escape into, but I prefer to make
it in two opening halves as described, as by this means when it is desired to introduce
the screw pattern into the mould box again for forming another mould, I am enabled
by opening the screw nut to slide in the screw pattern longitudinally through the
chamber in the mould board until it is in proper position, and then to close the nut
upon it, by which means the loss of time and wear of the parts in screwing in the
pattern through a solid nut are avoided. The before described chamber intervening
between the nut and the sand in the mould box is by preference formed in a collar or
piece separate from the mould board and secured thereto in any convenient manner.
The accompanying Drawing shews my before described Invention applied to
the casting of screws for screw jacks, that is to say, screws having a head at
the one end in which are holes at right angles to each other for receiving
the bar that serves to turn the screw. Fig. 1 is a vertical section of a mould
box with the screw pattern in position for ramming, shewing the screw nut
closed; Fig. 2 is the same view with the box inverted; Fig. 3 is a plan of the
outer side of the mould board; Fig. 4 is a plan of the inner side thereof; Fig. 5
is an elevation of the pattern for the upper half of the screw head; and
Fig. 6 is a plan of the core for the crossholes. The mould board A of the
box A' has fitted into it a collar B having a hole B' formed through it of such a
size that the screw pattern C will pass freely through it into and out of the sand
in the mould box, the hole B¹ being thus made to constitute the before described
chamber into which the particles of sand fall that may adhere to the pattern C on
withdrawing it from the mould. To the outer face of the collar B is secured, by
means of the screw D, the divided nut E, E¹, the halves of which open on D as a
pivot, as indicated at Figs. 2 and 3, and which when closed together so as to
embrace the pattern C fit round the screw F by means of forks, and are thus
secured in that position by tightening up the thumb nut F. As shewn at Fig. 3,

page_text: a narrow space e is left between the half nuts when closed for the purpose before
mentioned. In operating, the nut E, E, is first opened, and the pattern C is slid
through the chamber B¹ into its required position in the mould box, and the screw
nut is then closed upon it. The pattern for the head of the screw is made in two
halves G, G¹, of which the lower half G is placed against the inner face of the
mould board, as shewn at Fig. 4, fitting with its dowel pins g into holes in the
collar B. The pattern consists of a cylindrical piece G, with a central hole through
which the screw pattern passes freely, and with four semi-cylindrical lugs g³, g¹,
that serve to form the core-prints for the core H, Fig. 6. The above described
parts being in the position shewn in Fig. 1, the mould box is rammed, after which
it is placed on its side, and the screw pattern is withdrawn by screwing it back-
wards, as shewn at Fig. 2. The mould box is then inverted, as shewn in this
Figure, and the mould board A with the screw pattern is removed, leaving the half
pattern G in its place in the sand. The second half pattern of the head G¹ is then
placed on G, fitting with its holes on to the dowel pins g, and after placing a
shallow mould box on A¹, the pattern G¹ is rammed in the usual manner. Upon
then removing the mould box with the pattern G¹, this and the pattern G are
taken out, and after placing the core H, Fig. 6, in the core prints g, the box with
the mould of G¹ is fitted on again, thus forming the complete mould of the screw
with its head G, G', which is then cast in the usual manner. On again commencing
operations the screw nut E, E¹, is opened out, as at Fig. 2, and the screw pattern is
again slid into position in the box.
.
It will be evident that several sets of nuts E and screw patterns C, G, G¹, of
different sizes may be provided for use with one and the same mould board, it
being merely necessary to unscrew the screw D for replacing the nut by one of a
different size, the chamber B¹ being provided with bushes to suit screws of smaller
sizes.
'
Having thus described the nature of my Invention, and in what manner the
same is to be performed, I claim in respect of moulding apparatus for casting
screws,-
First. The use of a screw pattern that is screwed through a nut on the outer
side of the mould board, and that passes freely through a chamber provided between
such nut and the inner face of the mould board, which chamber serves to receive
particles of sand that pass along with the pattern on withdrawing this from the
mould, substantially as and for the purposes described.
Second. In combination with the screw moulding apparatus set forth in the
preceding claim, the provision of grooves or openings intersecting the thread of the
screw nut through which the screw pattern passes for receiving particles of sand,
substantially as herein described.
Third. In screw moulding apparatus as set forth in the first claim, constructing
the nut through which the screw pattern is screwed in two separate halves so that
it can be opened out to allow of the insertion of the screw pattern into the mould
box without screwing, substantially as herein described.
Fourth. The combination of the mould board A, collar B, divided screw nut E, E¹,
and screw patterns C, G, and G¹, arranged and operating substantially as herein
described for forming the moulds for casting jack-screws.
In witness whereof, I, the said William Allen Ingalls, have hereunto set my
hand and seal, this Twenty-seventh day of July, in the year of our Lord One
thousand eight hundred and eighty one.