Improvements in Sand-moulding Patterns.
Year: 1896

page_text: Date of Application, 31st Dec., 1896-Accepted, 6th Mar., 1897
COMPLETE SPECIFICATION.
Improvements in Sand-moulding Patterns.
I, JEAN AUZILLON of Famel (Lot and Garonne) in the Republic of France,
Mechanical Engineer 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 sand moulding tool principally intended to
be used for impressing or forming in the sand in a mould an undercut or enlarged
groove of any profile on the interior of a cylindrical or similar surface, as for
instance in forming the profiles for the ends of pipes.
This tool is shown in the annexed drawing in Fig. 1 in longitudinal section and
in Fig. 2 in oroes section on line ay of Fig. 1, the remaining figures illustrating
detail views of the various separate parts of the tool.
B is the body or frame of the tool and is made of cast iron for large sizes or of
bronze for small sizes. The part P serves as a pivot for the upper end of the shaft
of the excentric E and itself penetrates at the upper end into the model M with
which it is concentric, it may be of iron bored and screw threaded where shown by
means of the lathe, as indeed are the most of the parts of the apparatus. The
sleeve F may be of iron for the smaller and medium sizes, of cast iron only for the
larger sizes, it is screw threaded to engage in a screw threaded socket in
the model M or connected by a collar in two pieces if preferred, in either case in
such a way that it secures the remainder of the apparatus to the model M. It has
in its lower face a circular groove in which a projection on the body B engages,
this being for the purpose of preventing sand entering the interior of the tool and
of keeping the parts truly concentric in their rotary movement. The excentric E
should be of steel and should make only a half turn in its cage C, that is to say so
that when the blade O has been pushed out to the end of its course by a half turn
of the excentric the latter should need to be turned in the other direction to again
draw in the blade. The cage C which carries the blade O is excentrically disposed
in the frame B so that the excentric may make only a half turn. The cage moves
with slight friction in the frame and may if desired be made in one or several parts
for facility of manufacture. The part R is made of iron or steel and serves as a
bearing for the shaft of the excentric E, the part R being of any suitable length,
the shaft however being longer by some two or three centimeters according to the
space there may be to be disposed of for operating the tool. The section a b c d
Fig. 1 will vary according to the disposition of the tool that is to say of the models
and moulds in connection with which the tool is to be employed. The nut H
serves to keep the sleeve Fagainst the body B, it is screwed up so far that the
body B may turn with slight friction and without play on the surface tn while the
nut itself turus in the model M with which it should have no contact. O is
the blade of cast and tempered steel as hard as possible, it is embedded and
soldered with tin on the cage C. This operation which should be done when the
blade is already completely finished must be so performed as not to destroy the
temper of the steel, it is therefore tinned with the soldering iron, the iron cage C
is heated on a piece of a red hot iron and after the groove has been tinned the
blade is carefully placed therein and firmly pressed into place and the whole is
cooled with a little water. This blade is the only part of the tool subject to wear
and to frequent replacement.

page_text: In using the tool it should always be turned in a direction contrary to the hands
of a watch, the blade which may be called a slide compresses the sand without
cutting it, and the tendency is then for the various parts of the tool to become
screwed up more firmly as the screws are all cut to the right.
The use of this tool is as follows;-The tool being fixed to the model and its
action tested, the blade is protruded by turning the shaft of excentrio E by means
of a steel rod introduced into one of the holes at the exterior end of the shaft.
The blade is moistened with a littlo oil and left protruding. The mould is
provided with a little special sand, rather finer and with more body than the
ordinary sand, up to the height of the profile, say twelve or fifteen centimeters the
remainder of the mould being provided with the ordinary quality of sand.
When the mould is filled up to say half its height the workman at the lower end
of the mould places a key or spanner on the hexagon at the lower end of the part R
andi gives two or three turns to the left. When the operation is terminated as will
be the case when the tool is found to turn easily, the workman removes his spanner
and again withdraws the blade by turning the shaft of excentric E while the work-
men will have filled the upper part of the mould. The model is then drawn out in
the usual way and placed in another mould, the blade having been again protruded
and oiled.
This device is suitable for use in any kind of pipe making and makes with
correspondingly shaped blades and form of cross section without burr and with
perfect regularity and is therefore suitable for use in replacement of boxes
with inserted pieces, or detachable models.
Having now particularly described and ascertained the nature of this said
invention and in what manner the same is to be performed I declare that what
I claim is;
The construction of sand moulding tool with projectable and withdrawable blade
substantially as herein described and for the purpose set forth.
HERBERT HADDAN & Co.,
18 Buckingham Street, Strand, London, W.C., Agents to Applicant.