IMPROVEMENTS IN THE MANU- FACTURE OF STOPPERS AND CAPS FOR BOTTLES AND SIMILAR ARTICLES, AND IN THE APPARATUS OR MEANS TO BE EMPLOYED THEREIN, PARTS OF WHICH IMPROVEMENTS ARE ALSO APPLICABLE TO THE MANUFACTURE OF OTHER ARTICLES CAPABLE OF BEING MOULDED OR SHAPED BY COMPRESSION
Year: 1880

page_text: .
LETTERS PATENT to Alexander Richmond Stocker, of Islington, in tho
County of Middlesex, for an Invention of "IMPROVEMENTS IN THE MANU-
FACTURE OF STOPPERS AND CAPS FOR BOTTLES AND SIMILAR ARTICLES, AND
IN THE APPARATUS OR MEANS TO BE EMPLOYED THEREIN, PARTS OF WHICH
IMPROVEMENTS ARE ALSO APPLICABLE TO THE MANUFACTURE OF OTHER
ARTICLES CAPABLE OF BEING MOULDED OR SHAPED BY COMPRESSION."
"
PROVISIONAL SPECIFICATION left by the said Alexander Richmond Stocker
at the Office of the Commissioners of Patents on the 6th April 1880.
ALEXANDER RICHMOND STOCKER, of Islington, in the County of Middlesex.
IMPROVEMENTS IN THE MANUFACTURE OF STOPPERS AND CAPS FOR BOTTLES
AND SIMILAR ARTICLES, AND IN THE APPARATUS OR MEANS TO BE EMPLOYED
THEREIN, PARTS OF WHICH IMPROVEMENTS ARE ALSO APPLICABLE TO THE MANU-
FACTURE OF OTHER ARTICLES CAPABLE OF BEING MOULDED OR SHAPED BY
COMPRESSION."
This Invention relates to the manufacture of solid and perforated stoppers and
caps for bottles and similar articles from compressed pulverized clay or "dust," by
the aid of certain improved arrangements and combinations of apparatus or tools
specially adapted for operating upon dry pulverized clay or "dust "for facilitating the
removal of the compressed and moulded article from the tools without fracture. I
am aware that it has been proposed to manufacture stoppers and caps such as
feeding bottle tops, perfume sprinkler tops, and pomade caps from plastic clay
and from dry pulverized clay or "dust" by the aid of dies and pressure, and
therefore I lay no claim to such a mode of manufacture generally, my present
Invention consisting partly of improvements in the construction, arrangement, and
combination of the tools hitherto employed for the purpose of producing the class
of articles referred to and described in the Specifications to Letters Patent granted
to Alexander Southwood Stocker, bearing date respectively the 20th of April 1871,
No. 1149, and the 18th of January 1872, No. 154.
Heretofore a separate loose matrix has been employed for forming the screwed
nipple or projecting stem of sprinkler tops, which loose matrix was lifted out of
the lower die or mould along with the article which adhered to the top tool and
bad to be subsequently unscrewed by hand from the nipple, which operation
•

page_text: frequently resulted in the spoiling of the entire stopper by the twisting off or
fracture of the screwed part thereof; or the die for forming the screwed nipple was
secured to a spindle and unscrewed whilst the article remained in the matrix, but
in as much as the end of the nipple remained unsupported during the unscrowing
of the die frequent fractures still occurred.
Now, according to one part of my Invention, I employ a peculiar arrangement
of bottom tool or matrix for forming the said screwed part and the underside of
the article, such matrix consisting of a cast iron block having a cavity therein of
sufficient depth to accomodate the required amount of "dust" to form the article,
and containing a sliding steel collar, tube, or lifter within which works a second
steel collar or tube screwed internally, and fitting round a stationary screwed plug
or pin screwed centrally therein so that its upper end shall form the bottom of
that part of the matrix. which serves for producing the said projecting screwed
part or nipple of the stopper or sprinkler top. By this arrangement. I-am enabled.
to accomplish the release of the screwed part or nipple before the removal of the
entire article from the matrix by screwing downwards the second or inner collar
along the central plug or pin which serves, during that operation, as a support for
the end of the said nipple. By causing the top of the central pin to stand above
the screwed collar, and making the pin to screw downwards within the surrounding
screwed collar which in this case would remain stationary, I am enabled to produce
from clay "dust"a sprinkler top having an internally screwed aperture in the
top in lieu of a projecting screwed nipple, the said aperture being closed by a solid
screwed plug fitting therein. The outer sliding collar or tube serves as a lifter to
release the completed article from the matrix after the screwed portion has been
freed as above described.
I use in combination with the said improved matrix or bottom tool a peculiar
top tool or plunger for imparting the pressure and for forming the shank intended
to receive the cork of a plug stopper or sprinkler top, also the internal parts of caps
for bottles. This improved top tool consists of a plunger provided with an outer
annular slide in combination or not (as required) with a central tubular slide, the
said plunger and slide or slides entering within the deepened cavity of the matrix,
which they fit accurately, in lieu of abutting against the top surface or edge thereof.
The object of this arrangement of top tool is to facilitate the release of the articlo
from the face of the plunger by pressing upon the outer portion or edge of the
compressed article, and also at the same time upon the inner or contral portion,
according to the size of the article or whether it be made with a central shank.
Either or both of these annular or tubular slides are worked by a cross bar in
connection with the plunger, which may further be provided with a piercer if a
perforated stopper be required. This improved top tool with its releasing slide or
slides may also be used as a plunger in connection with other forms of matrices
or bottom tools shaped to produce the article required, whether stoppers, caps, or
sprinkler tops, but in all cases the matrices employed therewith should be made to
fit accurately round the plunger and its annular slides, and should bo of extra
depth for the reception of the required amount of "dust" and be further provided
with a lifter or releaser. The same arrangements and combinations of tools,
hereinbefore described, may also be employed for producing various other articles
capable of being moulded from clay"dust" by pressure, such as pots and jars,
table and chair castor balls or runners, bedstead furniture, and the like, or may be
applied to the manufacture of the class of stoppers or parts of stoppers referred to
in my Provisional Specification deposited on or about the 11th of December 1879,
No. 5064, the tools being of course of such a configuration as to produce the
particular shape of article required, and in cases where the lower matrix is
required to be undercut I divide the same vertically into two or more parts held
together by screws or otherwise, and used in conjunction with a bottom lifter for
releasing the article, and with the improved top tool or plunger herein before
described. In those stoppers requiring a shauk or screwed nipple, or both, such as
sprinkler tops, I propose, according to another part of my Invention, to make the

page_text: tops, shanks, and screwed nipples separately in lieu of in one piece, and to attach or
join the said part or parts to the tops after the first firing, and after having been
dipped in the glaze. The glazed parts having been thus put together the articlo
is fired in the usual manner, when the running of the glazo effectually reunites the
5 said parts together. By this mode of manufacture I effect greater economy by
avoiding the loss of the entire article in those cases where a defect in the formation
of the sbank or of the screwed part alone may occur, it being simply necessary in
such cases to select a fresh shank or nipple.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexander Richmond Stocker in the Great Seal Patont Office on
the 6th October 1880.
ALEXANDER RICHMOND STOCKER, of Islington, in the County of Middlesex.
"IMPROVEMENTS IN THE MANUFACTURE OF STOPPERS AND CAPS FOR BOTTLES
AND SIMILAR ARTICLES, AND IN THE APPARATUS OR MEANS TO BE EMPLOYED
THEREIN, PARTS OF WHICH IMPROVEMENTS ARE ALSO APPLICABLE TO THE MANU-
FACTURE OF OTHER ARTICLES CAPABLE OF BEING MOULDED OR SHAPED BY
COMPRESSION."
My said Invention relates chiefly to improvements in the tools to be employed in the
manufacture of solid and perforated stoppers and caps for bottles, such as perfume
sprinklers and pomade caps, feeding bottle tops, and similar articles from pulverized
clay or "dust" by compression, the said improved tools being specially constructed
and combined with a view to the better production of the class of stoppers above
referred to, by facilitating the release and removal from the tools of the compressed
and moulded articles without injury or fracture, and consists more particularly of
improvements in the construction, arrangement, and combination of the tools
described in the Specifications to Letters Patent granted to Alexander Southwood
Stocker, bearing date respectively the 29th of April 1871, No. 1149, and the
18th of January 1872, No. 154, for the manufacture from pulverized clay or
"dust" of the class of articles herein referred to.
Heretofore a separate inner loose matrix has been employed for forming the
screwed nipple or projecting stem of sprinkler tops, which loose matrix was lifted
out of the lower die or mould along with the article which adhered to the top tool,
and the said matrix had to be subsequently unscrewed by hand from off the nipple,
and this operation frequently resulted in the spoiling of the entire stopper by tho
twisting off of fracture of the screwed part thereof; or the die for forming the
screwed nipple was secured to a spindle and unscrewed whilst the article remained
in the matrix, but in as much as the end of the nipple remained unsupported during
the unscrewing of the die frequent fractures still occurred. Now, according to one
part of my lnvention, I employ a peculiar arrangement of bottom tool or matrix
for shaping, or forming and releasing the said screwed nipple along with the

page_text: corresponding side of the article or sprinkler top. This matrix or bottom tool is of
greater depth than heretofore in order to accomodate the extra bulk of material
or dust" required to form the compressed article, and is provided either with
rising and falling sides, or with fixed sides and a sliding steel collar or lifter to
facilitato the release of the article. In the centre of the bottom part of the matrix
(which when provided with rising and falling sides may be stationary) or inside
the sliding steel collar or lifter when employed in conjunction with fixed sides to
the matrix, works the upper portion of a tubular spindle capable of being rotated
round and also slid along a central stationary pin which acts as a support for
the end of the screwed nipple of the stopper when being freed or released from its
matrix, as hereinafter explained. The upper end of this pin forms the bottom of
an internally screwed cavity in the top of the tubular spindle when the latter is
elevated, which cavity serves for producing the projecting screwed part or nipple
of the stopper or sprinkler top. By screwing down the tubular spindle I unscrew
this part of the matrix and accomplish the release of the nipple therefrom before
the removal of the article, and as the central pin remains stationary during that
operation its upper extremity serves as a support or rest for the end of the
suspended screwed nipple, and thereby prevents the fracture of the same. By
having an external thread formed on the top of a central pin or spindle, and
causing it to stand slightly above the bottom of the die (the tubular spindle and
screwed cavity being dispensed with), and also making such pin to screw downwards
within the die I am 'enabled to produce an internally screwed aperture or recess in
the top of a sprinkler in lieu of a projecting screwed nipple, as above described,
the said aperture or recess serving for the reception of a separate solid screwed plug
or stopper. Or the projecting part which forms the said recess in the stopper may
be made plain and in one with the bottom die so as to produce a plain recess in the
stopper for the reception, as hereinafter mentioned, of a separate screwed nipple or
shank. The outer sliding collar serves not only as a portion of the lower die but
as a lifter to release the completed article from the matrix after the screwed portion
or nipple has been freed, as above described.
I use in combination with the above described improved matrix or bottom tool a
peculiar top tool or plunger for imparting the pressure and for forming the under
surface of the stopper, as well as the shank intended to receive the cork of a plug
stopper or sprinkler top, also the internal parts of caps for bottles and other
receptacles. This improved top tool consists of a plunger provided with an outer
annular slide and; a central slide, or either one or the other, the said combined
plunger and slide or slides ontering within and fitting the deepened cavity of the
matrix. The object of this arrangement of top tool is to facilitate the release of the
compressed article from the face of the plunger by applying a separate downward
releasing thrust upon the outer portion or edge of the article (either before or after
it has left the matrix), and also at the same time, if desired, upon the inner or central
portion, or upon the central portion alone, according to the size of the article,
or whether it be made with or without a central shank. One or both of these
slides may be worked by a cross bar in connection with the plunger acted upon by
fixed stops as the plunger rises, or (which I prefer) in lieu of the cross bar and
fixed stops a helical or other spring may be interposed between the top of the slide
or slides, and a projection or collar on the body of the plunger, the said spring
tending always to force the slide or slides downwards, and thereby release the
article from the top tool. The plunger (or, in some cases, the matrix) is further
provided with a piercer if a perforated stopper be required. The hereinafter
described improved top tool may also be used as a plunger in connection with other
forms of matrices or bottom tools, shaped to produce the article required, whether
stoppers, caps, or sprinkler tops, but in all cases the outer slide should enter within
and fit the matrix accurately, and the matrix, whether made in one or more parts,
should be of extra depth to allow for the reception of the required amount of "dust,"
and should either be further provided with a convenient lifter or releaser, or made
to divide or open for the release of the article, or be provided with descending sides.

page_text: The same arrangements and combinations of tools hereinbefore described may
obviously be employed for producing various other articles capable of being moulded
from clay-dust by pressure, such as pots and jars, table and chair castor balls or
runners, bedstead furniture, and the like, or may be applied to the manufacture of
the particular class of stoppers or parts of stoppers for which I obtained Letters
Patent bearing date the 11th of December 1870, No. 5064, the acting faces of the
said improved tools being of course of such a configuration as to produce by their
combined action the particular shape of article required. In those stoppers requiring
a shank or a screwed nipple, or both, such as sprinkler tops, gum bottle tops, and
the like, I propose, according to another part of my Invention, to make the shanks
and screwed nipples separately in any well known or convenient manner in lieu of
in one piece with the top or stopper, and to attach or join the said part or parts to
the tops after the first firing, and after the parts have been dipped in the glaze.
The glazed parts having been thus put together the article is fired in the usual
manner, when the running of the glaze effectually secures the said parts together.
By this mode of manufacture I effect greater economy by avoiding the loss of the
entire article in those cases where a defect in the formation of the shank or of
the screwed part alone may occur, it being simply necessary in such cases to select
a fresh shank or nipple.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same, and for that purpose shall
refer to the several Figures on the explanatory Sheet of Drawings hereunto
annexed, the same letters of reference indicating corresponding parts in all the
Figures.
Figures 1 and 2 of my Drawings represent in vertical section the combination of
my improved top and bottom tools, here shown as adapted for making sprinkler
tops with perforated scrowed nipples and cork shanks, from pulverized clay or
"dust." In Figure 1 the top tool or plunger A is shown elevated, and the bottom
tool or matrix B is shown as filled with the required amount of pulverized clay or
"dust" to form the completed article. In Figure 2 the top tool is shown in its
lowest position inside the matrix, having completed the act of compression and
being just about to ascend so as to release itself from the article. In this Figure
I have also represented the screwed nipple tas released from its inatrix, and
supported at its lower end by the central stationary supporting pin in readiness
for the release of the entire article from the bottom tool or matrix.
a is a portion of the descending block of a fly or other press, into which is
secured the improved top tool A, consisting of a fixed part a¹ an outer annular
slide b, an inner slide c, and a piercer or perforator d to be employed when making
a perforated article; or, if preferred, the perforator may be fitted into the bottom
tool. e is a cross bar passing transversely through a slot fin the plunger body to
which bar e are connected the outer and inner releasing slides b and c, or either of
them, according as one or two slides may be required; g is a spring for forcing the
said slide or slides outwards. The outer slide 6 is made to enter and fit accurately
the matrix B (see Figure 2), which is of sufficient depth to contain the required
amount of "dust." This matrix consists of a steel collar h of an inner diameter
corresponding to the largest diameter of the article to be made, and fixed by a set
screw or otherwise in the stationary block or holder i. The matrix is here shown
as provided with an annular die or lifter, within which works by a screw thread
at the central rotary tubular spindle m, carrying a hand wheel n for the cou-
venience of rotating the same, the part & being prevented from rotating within the
collar h by any well known contrivance. The tubular spindle m rotates round
and slides freely up and down the central stationary supporting pin o, secured in
any convenient manner to the fixed part of the tool, but by preference so as to be
vertically adjustable. Within the upper end of the tubular spindle m there is
formed an internal screwed cavity or matrix p (see detail Figure 2), of sufficient
depth for forming the desired length of screwed nipple, the pitch of the thread in
the said cavity being the same as that of the external thread on the spindle. The

page_text: upper end of the stationary pin o constitutes the bottom of the small screwed
matrix p when the tubular spindle is fully screwed up, in which position it receives
the "dust" (see Fig. 1). q shows one of a pair of lever arms connected to a rocking
shaft T, and coupled by pins to the annular lifter k, which pins work in slots in
the holder . Thus by incans of a lever handle (not shown in my Drawing)
mounted on the shaft r the entire bottom of the matrix B can be readily lifted so
as to release the compressed article. It is obvious that other arrangements of
levers may be employed for the same purpose. The perforator d, as here shown,
is fixed in or made in one piece with a stem d screwed centrally into the upper
part of the shank of the plunger, it is of any required diameter and passes centrally
down the inner slide c, its length being sufficient to pass completely through the
compressed article, as shown in Fig. 2.
The combined action of these tools is as follows :-
The matrix B having been filled with "dust" -the-top tool A is brought down
with considerable force inside the matrix, when the outer and inner projecting
slides b and c on entering the matrix first commence to compress the “dust,” the
pressure being imparted to the said slides from the press through the spring g. As
the top tool continues to descend the part a' thereof follows down along with the
piercer or perforator d (when used in the said tool) until it reaches the position
shown in Fig. 2, thereby forming the central cavity in the top tool requisite for
shaping the shank u for the reception of the cork, and when requisite perforating the
same, by which time the spring g is fully compressed, see Fig. 2. Before the article
is lifted or released from the bottom tool the screwed nipple is first freed by
screwing down the tubular spindle m to the position shown in Fig. 2. The part a'
of the top tool then commences to rise, whilst the spring g as it expands still
maintains for a time the slide or slides b and c in contact with the article so
as to enable the top tool to free itself therefrom whilst it is still in the
matrix. The top tool continues its ascent and the spring g at the same time
by its expansion forces outwards the slide or slides b, c, until they assume the
position shown in Fig. 1. The lifter k, along with the tubular spindle m constituting
The bottom of the matrix, is then elevated by the arms q, or otherwise, until the
compressed article is brought to the top of the matrix in readiness to be
removed by the attendant, who then prepares the matrix for a fresh charge of
"dust" by allowing the bottom to descend again and screwing up the tubular
spindle m, so as to form the cavity for shaping the nipple when the operations are
repeated, and so on. If desired, the top tool and the bottom of the matrix may
both be made to rise simultaneously, so as to maintain the article in contact with
both the acting faces until it has been raised to the desired height, when the top
tool by continuing its ascent will carry up the article along with it until quite clear
of the matrix, by which time the slides b and c will have all but completely
released it from the face of the top tool, leaving it to be removed therefrom by the
hand of the attendant. Figure 3 shows a modification of the matrix B, intended to
be used in combination with the same top tool A (Figure 1) for the production of a
sprinkler top having, in lieu of a screwed projection or nipple, a screwed recess
therein, which recess is intended for the reception of a separate solid plug or
stopper of metal or other suitable material (see Figure 3a). In this case the externally
screwed end m³ of the central rotary rising and falling spindle m is made to pass
through and project to the required extent above the surface of the bottom lifter k,
the diameter of the screwed part m' being that of the required recess. In order to
release the screwed recess, the spindle m is screwed downwards after the article has
been formed, and the compressed article is then lifted out of the matrix by sliding
upwards the spindle m along with the lifter through which it is screwed, as
shown. By making the part m' plain, a plain recess 8 may be made in the article
for the reception of a separately formed screwed nipple (see Figure 4), or a
separately formed shank u for the cork on the opposite side of the article, such
separate part or parts being glazed, and subsequently fitted into the said corre-
sponding recess or recesses, and permanently secured therein by the running of the

page_text: glaze in the process of firing, as herein before described. When a plain recess is to
be made, the spindle m need not be rotated, but may be simply slid up or down
within the part k, and raised bodily along with it for the releasing of the completed
article. The same matrix, Figure 3, may be provided with a solid loose bottom die or
lifter, made with or without a central projecting part in one therewith, for
forming or not a plain recess in the article, in which case the separate projecting
end m of the spindle m may be dispensed with, and by giving the required shapo
to the die k, various shaped stoppers, whether perforated or not, may be made
thereby, with or without the recess. Figure 5 is a vertical section of a top and
bottom tool constructed and arranged so as to work together according to my
Invention, and showing their respective acting faces as adapted for producing
pomade bottle caps, and the like articles froin pulverized clay or dust; and
Figure 6 is a separate section of the top tool alone, showing the moulded article as
all but released therefrom. In these Figures I have only illustrated a single outer
slide bon the top tool, the said slide being so made as to fit and enter within the
sides of the matrix or botton tool, which is made deep enough to contain the
required amount of clay "dust," and is further provided with a lifter or moveable
bottom die k for releasing the article from the matrix. The slide b, as in Figure 1,
works freely along the body a' of the plunger with which it is connected by the
cross bare working in a slot f, but in lieu of being acted upon by the spring g, tho
ends of the bar e are brought by the rising of the top tool into contact with fixed
stops, by preference made adjustable in the body or frame of the press, so that as
the top tool rises with the article adhering thereto, the stops will cause the slide b
to descend (see Figure 6), and will free tho article therefrom. m is a central sliding
rod worked by a hund lever or otherwise for elevating the lifter k. By making
a central projection on the face al of the top tool, and a corresponding projection on
the surface of the bottom die k, a cap with an opening through the centre may be
produced; and in cases where a cork shank is required in the said cap, the top tool
may be constructed as in Figure 1, that is to say, with a central cavity to form the
shank, and either with or without the perforator, according as the shank is to be
perforated or solid. The matrix employed in conjunction with the improved top
tools may be made to release the article either by using a lifter or rising bottom, or
by making the sides to descend, leaving the bottom of the matrix stationary, or
by dividing the matrix into two or more parts or segments.
Having now described and particularly ascertained the nature of my said
Invention and the manner in which the same is or may be used or carried into
effect, I would observe in conclusion that I do not claim generally the manufacture,
by the aid of dies and pressure, of stoppers and caps for bottles, such as feeding
bottle tops, perfume sprinkler tops, pomade caps, and the like, from plastic clay,
nor from dried and pulverized clay in its "dust" state, the same being set forth in
the Specifications, Nos. 1149, A.D. 1871, 154, A.D. 1872, and 702, A.D. 1873;
neither do I claim generally, for the purpose specified, the use of a plain plunger
fitting and entering into a socket or matrix, the same being shown in the aforesaid
Specification, No. 702, A.D. 1873; nor the use of a top tool fitted with an outer
slide, which is made so as to abut against the top of the matrix, the same being
shown in the aforesaid Specification, No. 1149, A.D. 1871; nor do I claim the
releasing of the externally screwed parts of stoppers whilst in the matrix or mould
by unscrewing therefrom an internally screw threaded ring or matrix, the same
being shown and described in the aforesaid Specification, No. 154, A.D. 1872; nor
the use of a fixed central pin or core and sliding concentric annular die or lifter in
the matrix or bottom tool, the same being also shown in the aforesaid Speci-
fications, Nos. 154, A.D. 1872, and 702, A.D. 1873; but what I consider to be
novel and original, and therefore claim as the Invention secured to me by the herein-
before in part recited Letters Patent is,-
"
First. The combination and arrangement of parts constituting an improved
bottom tool or matrix to be employed for producing from pulverized clay or "dust"
by compression, perfuine sprinkler tops or stoppers, and other like articles having

page_text: externally screwed projections or nipples, and for releasing such articles from the
matrix without fracture, substantially as hereinbefore described and illustrated by
Figures 1 and 2 of my Drawings.
Secondly. The combination of central stationary supporting pin and concentric
rotary screwed matrix for forming the screwed nipples of perfume sprinkler tops,
and other like stoppers made by compression from pulverized clay or "dust," and
supporting the same during the withdrawal of the matrix, substantially as herein-
before described and illustrated by Figures 1, 2, and 2 of my Drawings.
Thirdly. In the manufacture of moulded compressed articles, of the kind referred
to, from pulverized clay or "dust," the use in combination of a plunger and matrix
when the plunger is provided with an outer annular releasing slide so arranged as
to enter and fit accurately within the matrix, and the matrix is of sufficient depth to
contain the amount of pulverized clay or "dust" required to produce the article,
and is further provided with a lifter, or is otherwise so-constructed as to release the
compressed article, substantially as hereinbefore described.
Fourthly. In the manufacture of moulded compressed articles, of the kind herein
referred to, from pulverized clay or "dust," the use in combination of a plunger
and matrix when the plunger is provided with an inner or central releasing slide,
and is made to enter and fit accurately within the matrix, and the matrix is of
sufficient depth to contain the amount of pulverized clay or "dust" required to
produce the article, and is further provided with a lifter, or is otherwise so
constructed as to release the compressed article, substantially as hereinbefore
described.
.
Fifthly. In the manufacture of moulded compressed articles, of the kind herein
referred to, from pulverized clay or "dust," the use in combination of a plunger
and matrix when the plunger is provided with inner and outer releasing, slides
made to enter the matrix along with it, and the matrix is of sufficient depth
to accomodate the amount of pulverized clay or " dust" required to produce
the article, and is further provided with a lifter, or is otherwise so constructed as
to release the compressed article, substantially as hereinbefore described.
Sixthly. The manufacture of sprinkler tops and other like stoppers from com-
pressed pulverized clay or "dust" by making the screwed nipples or the shanks for
the corks of such stoppers, or both, separately from the head, and uniting such parts
thereto by glazing and firing, substantially in the manner and for the purpose
herein before described.
"dust" of
Seventhly. The manufacture from compressed pulverized clay or
perforated stoppers and sprinkler tops, having an internally screwed aperture or
recess made therein for the reception of a separate stopper or plug of metal or other
suitable material, and the combination and arrangement of tools for producing
the same, as hereinbefore described and illustrated by Figures 3 and 3ª of my
Drawings.
In witness whereof, I, the said Alexander Richmond Stocker, have hereunto
set my hand and seal, this Sixth day of October, in the year of our Lord