An Improved Appliance for Making Loam Cores.
Year: 1893

page_text: Date of Application, 14th June, 1893
Complete Specification Left, 11th Dec., 1893-Accepted, 13th Jan., 1894
PROVISIONAL SPECIFICATION.
An Improved Appliance for Making Loam Cores.
FREDERICK ARTHUR WILLIAMS, Engineer, Glaslyn Caerau Newport Mon-
mouthshire, do hereby declare the nature of this invention to be as follows:-
My invention relates to an improved appliance for sweeping or forming in loam
on a bar having a rotary motion cores of a more or less rectangular form, such as
used in the manufacture of ingot moulds and the like; also for making other cores
that cannot be made by means of a fixed loam board and a revolving bar as is
usual in pipe making.
In order that my invention and the application thereof may be clearly under-
stood, I have appended the accompanying sheet of drawings-
Fig. 1 shows a plan and Fig. 2 an end elevation.
AA are two flanges each being made in halves hinged at M and fastened on to
core bar B by means of pin, and cotter, or other suitable arrangement at N. The
flanges are fixed one at each end of core bar B and revolve with it.
I; these
On faces of flanges A. A are cast or formed suitable guide grooves
grooves are similar in shape to core required to be made; attached to loam
board E are two guides or brackets carrying two rollers F, F, which are arranged
to run in grooves I I-in flanges A. A.
The core bar B is provided with suitable centres, or spindle G G, on either
end of which a handle may be fixed for the purpose of turning the core bar.
These centres work in suitable bearings provided on the tops of trestles H H.
The tops of trestles also support loam board; which loam board is allowed to
travel according to motion transmitted to it by means of grooves I I and
rollers F F.
The mode of using the appliance is as follows:-
The core bar B is bound round with hay-band or other suitable material, turned
towards loam board E and loam applied in same manner as in round pipe core
making. The forming edge J of loam board E is always in the same relative
position to centre of core bar B as the guide grooves II are to centre of core
bar G; therefore by a series of revolutions and application of loam a core is
formed, of similar shape to guide groove; and the size of core may be varied
according to relative position of forming edge J and centre of groove I by means
of a suitable adjustment.
Dated this 13th day of June 1893.
FREDERICK ARTHUR WILLIAMS.
COMPLETE SPECIFICATION.
An Improved Appliance for Making Loam Cores.
I FREDERICK ARTHUR WILLIAMS of Arbarland, Bryngwyn Road, Clytha
Park, Newport, in the County of Monmouthshire 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 relates to an improved appliance for forming loam cores upon
a rotating core bar by what is known as "sweeping.".

page_text: Hitherto it has only been practicable to form cores of a circular transverse
section, such as are used in pipe making for example, by this process.
Now the object of the present invention is to enable cores of a more or less
rectangular section (such as those employed in the manufacture of ingot moulds
and the like for example) or cores of various sections other than circular, to be
formed by sweeping on a rotating core bar, and I attain this object by the
employment of a reciprocating loam board arranged and operated substantially as
hereinafter described.
My invention will be clearly understood on referring to the drawings left with
my Provisional Specification in which
Figure 1 is a plan and Figure 2 an end view of the appliance or apparatus.
B is the core bar which corresponds in section with that of the core to be
formed, and is rotated in suitable bearings in the side frames or trestles H by any
convenient means such as a handle secured to its axis G. E is the loam board
supported on the horizontal parts of the side frames H (or upon other suitable
supports) so as to be capable of movement thercon towards and from the core
bar B. A, A, are flanges detachably secured one at each end of the core bar B
and revolving therewith. In the drawings I have represented these flanges as
being each made in two portions hinged together at M, and secured around the
core bar by a pin and cotter at N. II are grooves serving as cam paths cast or
otherwise formed in the faces of the flanges A A, which grooves also correspond
in shape with the section of the core to be formed.
The loam board E is provided at each end with arms or runners which travel
upon the side frames H and carry at their extremities rollers or pins F F, which
engage with and accurately fit the grooves II in the flanges A. It is clear
that when the core bar B is rotated, as by the handle secured to its axis G, a
reciprocating movement towards and from the axial line of the core bar will be
imparted to the loam board E, and that the distance which separates the forming
edge of said loam board from said axial line will vary in the same proportion as
the distance between the acting points of the grooves II and said axial line
varies.
The apparatus is used as follows:-
The core bar B is bound with hay band or other suitable material and rotated
towards the loam board E loam is then applied to the core bar and swept off
therefrom by the loam board in the usual manner as in pipe core making, and,
since as before mentioned, the distance which separates the forming edge of the
loam board from the axial line of the core bar B varies in the same proportion as
the distance between the acting points of the grooves or cam paths II and said
axial line, it follows that by a series of revolutions of the core bar a core exactly
corresponding in transverse section with the shape of the grooves or cam paths I I
will be produced. The thickness or size of the core may be varied by increasing
or diminishing the space between the forming edges of the loam board and the core
bar which may be effected in any suitable manner.
Although I have described and illustrated the core bar B as corresponding in
section with the shape of the grooves or cam paths I I, it would be possible to
employ if desired a core bar only approximately corresponding in section to
the shape of such grooves or cam paths but in this case the sides of the cores
produced would necessarily be of unequal thickness which would be objectionable.
Referring to the sheet of drawings left herewith in which the various parts are
lettered to correspond with like parts represented in the drawings above referred to
and left with my Provisional Specification
Figure 1 is a diagrain representing a slight modification wherein the cam paths
for reciprocating the loam board consist of webs or flanges I¹ formed on the
flanges A and engaged on either side by rollers F F' mounted on the arms or
runners of the loam board E.
Figure 2 is a plan and Figure 3 a sectional end elevation on line 1-2 Figure 2
of another slightly modified arrangement of the appliance.

page_text: In these last mentioned figures it will be seen that the flanges A are dispensed:
with and that the cam paths consist merely of the ends I* I' of the core bar itself
which ends are made the exact shape of the core to be produced. The rollers F
are held in close engagement with these cam paths or surfaces I' I' by weighted
levers O the slotted portions of which engage with pins P on the arms or guides of
the loam board E. E' E' are projections on the loam board which limit the length.
of the core produced.
Referring again to Figure 1, in lieu of two rollers F F' embracing either side of
the cam path one roller only may be employed maintained in contact with the
inner or outer surface of 1' by an arrangement of weighted lever O as represented.
in Figures 2 and 3.
It will be understood that instead of the weighted lever ☐ a spring or other
equivalent arrangement for holding the roller F in close contact with the cam path.
or surface may be employed.
When a number of cores of uniform size are to be produced I prefer to employ
core bars provided with detachable flanges A as described with reference to the
drawings left with my Provisional Specification, since this arrangement permits
one pair of flanges to be used upon any number of core bars and thus ensures-
absolute uniformity in the size of the cores produced the said size being as
before explained regulated by the shape of the cam paths carried by the
flanges A.
I also prefer to move the loam board both towards and from axial line of
the core bar by means of the cam paths or surfaces revolving with the latter
(see the drawings left with my Provisional Specification and Figure 1 of the-
drawings left herewith) in lieu of moving the said loam board in one direction
only by the cam paths and in the other direction by weights or springs as.
described with reference to and illustrated in Figures 2 and 3 of the drawings
herewith, since in the last mentioned arrangement the motion of the loam board
will be less even and on account of the extra friction more power will be required
to rotate the appliance.
Having now particularly described and ascertained the nature of the said inven--
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. An appliance for making loam cores by "sweeping" wherein a groove or cam.
path rotating with the core bar and corresponding in shape with the section of the
core to be formed imparts movement to the loam board substantially as and for the
purpose described and illustrated.
2. In an appliance for forming loam cores by sweeping, in combination, a rotating
core bar B. flanges A. A secured thereto and rotating therewith, and provided with.
cam paths or grooves I I corresponding in shape with the section of the core to be
produced, a loam board E and arms or runners secured to said loam board and
carrying rollers or pins F which engage with the cam paths or grooves I I
substantially as described and illustrated.
3. The general construction arrangement and combination of parts constituting:
an appliance for making loam cores substantially as described and illustrated.
Dated this 11th day of December 1893.
E. P. ALEXANDER & SON,
Chartered Patent Agents,
19, Southampton Buildings, Chancery Lane, London, W.C.,
For the Applicant.