Improvements in the Manufacture of Tiles and the like, and in Apparatus therefor.
Year: 1891

page_text: Date of Application, 21st Nov., 1891
Complete Specification Left, 29th Aug., 1892-Accepted, 8th Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Tiles and the like, and in
Apparatus therefor.
We, CRAVEN DUNNILL AND COMPANY LIMITED, of the Jackfield Works,
Jackfield, in the County of Salop, Encaustic, Geometric and Ceramic Mosaic
Manufacturers, and FRANCIS RAWDON SMITH, of Ironbridge, in the County of
Salop, Assistant Manager to the aforesaid Company, do hereby declare the nature
of this invention to be as follows:-
Our invention relates to the manufacture of tiles and the like having undercut
recesses in their backs, sides and faces and to apparatus therefor.
In manufacturing tiles with undercut recesses by the means heretofore employed
the projecting edges of the undercuts and other parts of the tiles have been more
or less damaged while removing them from the die or mould. The object of our
invention is to obviate these objections.
For this purpose we advantageously make the parts of the bottom plate or die
which form the undercuts tapering from one end to the other and hinged or
movable upon pivots so that one end can be lifted.
The tile when moulded is slid off the die, the tapering form of which causes the
undercuts in the tile to be released from contact with the die, at the same time any
tendency of the tile to rise whilst being drawn off the die is provided for by the
hinged parts of the die moving upon its pivots whereby the undercut portions of
the tile are prevented from being broken off or injured.
Or the die may be made in parts kept in position by wedge-shaped pieces
engaging therewith by suitable means such as by dovetails and carried on a
movable bottom in such a manner that, when the tile has been moulded, the
movable bottom or plate is lowered carrying with it the wedge, thereby moving the
two parts of the die towards one another so as to free thein from the undercuts
when the tile can be removed. The parts of the die are provided with suitable
guides.
Dated the 21st day of November 1801
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Tiles and the like, and in
Apparatus therefor.
We, CRAVEN DUNNILL AND COMPANY LIMITED, of the Jackfield Works,
Jackfield, in the County of Salop, Encaustic Geometric and Ceramic Mosaic
Manufacturers, and FRANCIS RAWDON SMITH, of Ironbridge, in the County of
Salop, Assistant Manager to the aforesaid Company, 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 :-
Our invention relates to the manufacture of tiles and the like having undercut
recesses and to apparatus therefor.
In manufacturing tiles with undercut recesses by the means heretofore employed
the projecting edges of the undercuts and other parts of the tiles have been more

page_text: or less damaged while removing them from the die or mould. The object of our
invention is to obviate these objections.
For this purpose we advantageously make the parts of the bottom plate or die
which form the undercuts tapering from one end to the other and hinged or
movable upon pivots so that one end can be lifted.
Or the die may be made in parts kept in position by wedge-shaped pieces or
blocks engaging therewith by suitable means such as by dovetails and carried on a
movable bottom.
To enable our invention to be fully understood we will describe how it can be
carried into practice by reference to the accompanying drawings, in which :-
Figure 1 is a plan of the bottom plate or die of one form of apparatus for the
manufacture of tiles and the like according to our invention.
Figures 2 and 3 are elevations of the two respective ends of Figure 1.
Figure 4 is a section on the line A B of Figure 1, and
Figure 5 is a section of a tile made by means of this apparatus.
Figure 6 is a similar view to Figure 1 but shewing the bottom plate or die of the
modified form of our apparatus.
Figure 7 is a vertical section taken on the line C D of Figure 6, and,
Figure 8 is a section of a tile made by means of this apparatus.
We will first describe our invention by reference to Figures 1 to 5.
a, a' are the parts of the bottom plate or die which form the undercuts in the
tiles, such parts being made tapering from the ends a to the ends a¹ as shewn and
placed in recesses in the other part or base b of the bottom plate or die; c, c are
the pivots by which the ends a are hinged to the base & and which allow the other
ends a to be lifted as shewn by the dotted lines in Figure 4.
The top plate or die is of usual construction and is therefore not shewn.
The tile when moulded is slid off the die, the tapering form of the parts a, a' of
which causes the undercuts (d, d Figure 5) in the tile to be released from contact
with the die, at the same time any tendency of the tile to rise, whilst being drawn
off the die is provided for by the yielding movement of the parts a, a¹ of the die
upon its pivots c, c whereby the undercut portions d, d of the tile are prevented
from being broken off or injured.
It is evident that the parts of our hinged bottom plate or die which form the
undercuts in the tiles can, if desired, be made parallel instead of tapering from
end to end.
In the modification shewn in Figures 6 and 7 instead of making the parts of
the bottom plate or die which form the undercuts, tapering from end to end we
construct them in parts a, a¹ which are kept in their normal or moulding position
by means of wedge shaped pieces or blocks e, e formed with dovetail grooves
engaging corresponding dovetails indicated at f, in dotted lines on the inner
faces of the parts a, a' of the bottom plate or die. These wedge shaped blocks e, e
are carried on a bottom or plate y which is adapted to be lowered and raised by
suitable means not shewn in the drawing. The parts a, a' of the bottom plate or
die are provided with pins or projections (shewn in dotted lines at h, h) engaged in
recesses in the other part 6 for the purpose of retaining the said parts within the
part b. The part 6 of the die is supported on a standard i enclosed within the
hollow supporting column of the plate y and which column works over the said
standard when raising and lowering the plate g.
By this construction when a tile has been moulded (during which moulding
operation the parts are in the position shewn by the full lines in Figures 6 and 7)
the movable bottom or plate g is lowered (as shewn by the dotted lines in Figure 7)
carrying with it the wedge shaped blocks e, e thereby moving the two parts a, a¹ of
the die inwards towards one another so as to free them from the undercuts d, d
(Figure 8) of the tiles, when the latter can be removed from the die.
It will be obvious that instead of the bottom plate g being movable the part b of
the die may be arranged to lift while the plate remains stationary.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1. In apparatus for the manufacture of tiles and the like having undercut
recesses making the bottom plate or die which forms the undercuts tapering from
one end to the other, or parallel, and hinged or movable upon pivots, substantially
as and for the purposes herein before described.
2. Apparatus for the manufacture of tiles and the like with undercut recesses,
comprising a bottom plate or die having the portions thereof which form the
undercuts made in parts kept in their normal or moulding position by wedge
shaped pieces or blocks engaging therewith and carried on a suitably operated
movable botton, substantially as and for the purposes set forth.
3. The improved apparatus for the manufacture of tiles and the like hereinbefore
described and illustrated in Figures 1 to 4 and in Figures 6 and 7 of the accom-
panying drawings.
4. The manufacture of tiles and the like by the improved apparatus hereinbefore
described and illustrated in Figures 1 to 4 and in Figures 6 and 7 of the accom-
panying drawings.
3100th dow of A vonot 180°
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.