Improvements in or relating to Moulds for Making Glass or similar Ware.
Year: 1899

page_text: Date of Application, 5th June, 1899
Complete Specification Left, 5th Mar., 1900-Accepted, 28th Apr., 1900
Improvements in or relating to Moulds for Making Glass or similar
Ware.
A communication from GEORGE B. M. GRAY, Broker, and WALTER H. WRAZER,
Broker, both of Oakland, Alameda County, California, United States of
America.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention to be as
follows:-
This invention has reference to improvements in moulds for making glass or
similar ware and has special reference to moulds for making threaded glass caps
for fruit jars and the like.
"
The mould consists of four principal operative parts, viz. a base-piece to be
set removably upon the glass-moulding press, having a central portion shaped to
form the top of the glass cap and having a groove or channel outside of the
said central portion concentric therewith; a mould-ring seated on the base-plate,
having an underside flange to fit in the groove in the base-plate, and having a
central opening with vertical corrugations, the counterpart of corrugations to
be formed on the outside of the top of the glass cap, said central opening, above
the corrugations, being increased in diameter to form a seat for a screw-ring;
a screw-ring seated in the said increased opening of the mould-ring and having
an outside flange to overlap the top of the mould-ring, and having a central
cylindrical bore to receive a cylindrical plunger, and a cylindrical plunger which
passes down into the mould to press the glass article into shape.
The cylindrical opening in the screw-ring is enlarged on the inner side to a
degree equal to the thickness of the flange to be formed on the underside of the
glass cap, and the walls of this increased bore are screw-threaded to form
counterpart threads on the flange of the cap.
The mould-ring and the screw-ring are fastened together in a manner to permit
of free rotation of one piece on the other without their separation, and the two
rings are each provided with handles by which the lower, or mould-ring, is held
while the upper screw-ring is rotated. After the glass-cap has been formed the
mould and screw rings are lifted off of the base-plate and the cap is discharged
(screwed) from the mould by rotating the screw-ring. The vertical corrugations
in the mould-ring prevent rotation of the glass cap when the screw-ring is
rotated.
Dated this 6th day of June 1890
BOULT & WADE,
Agents for the Applicant.

page_text: "
COMPLETE SPECIFICATION,
Improvements in or relating to Moulds for Making Glass or similar
Ware.
A communication from GEORGE B. M. GRAY, Broker, and WALTER H. WRAZER.
Broker, both of Oakland, Alameda County, California, United States of
America.
I. ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, 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 improvements in molds for making externally screw
threaded glass caps for fruit cans and the like, the object being to provide means
whereby the thread forming part of the mold is removed by screwing it off
of the cap in order to produce a more perfect thread than can be produced in a
two-part hinged mold which opens to receive the product.
The object of the invention is to produce a simple, efficient and quick acting
mechanism whereby the caps can be made rapidly and consequently at small cost.
Referring to the accompanying drawings, Figure 1 is a view in side elevation
of my improved mold with the several parts in place after the article of glass-
ware has been pressed therein; Figure 2, a vertical cross section through the
axis of the mold of Figure 1; Figure 3 a horizontal section on the dotted
lines 3, 3, of Figure 2, and Figure 4 a view in perspective of the finished article
of glassware externally screw-threaded as it comes from the mold shown in the
preceding figures.
Similar letters of reference indicate like parts throughout the several views of
the drawings.
The mold consists of four operative parts-viz., the base of the mold A, the
internally corrugated mold-ring B, the screw-ring C, and the plunger D. The
base-piece A is adapted to be set upon the glass-molding press, so as to be readily
removed therefrom. It has the central protuberance a, to fashion the concavity
in the top of the glass-cap, and at a suitable distance outside of said protuberance
it is provided with the annular groove a¹, preferably with a sloping inner wall a².
The mold-ring B has a central opening with vertical corrugations B¹, the
counterpart of the corrugations to be formed on the outside of the top flange of
the glass cap E. It also is provided with the marginal under-side flange b.
shaped to fit the groove a¹ of the base A, where it is placed without being attached
thereto. Above the corrugated opening through the mold-ring a cavity is formed
large enough to receive the screw-ring C.
The screw-ring C has a flange e, which extends over or upon the top of the
mold-ring B. It has a central cavity or hore C which is cylindrical and of such
diameter as to receive the cylindrical plunger D. The under side of the plunger D
may be a plain surface, or may have any pattern or letters, formed either in
cameo or intaglio, that may be desired to be impressed in the inner surface of
the glass screw-cap. The collar of the glass cap is formed by increasing the
diameter of the central cavity or bore of the screw-ring C at its inner end an
amount equal to the desired thickness of the said collar. The side wall of this
enlarged bore is provided with screw-threads the counterpart of the screw-threads
to be formed on the outside of the collar of the glass cap E. The shoulder
formed by the increased bore is shown at 2. Figure 2. and has an annular
flange, which produces a recess or groove in the under face of the collar of

page_text: the glass-cap. The outside diameter of the threaded collar made by the mold
is just small enough to pass freely through the corrugated opening in the mold-
ring B in discharging the finished article of glass-ware from said mold. Formed
around the screw-ring C, immediately under the flange e, is a groove, into
which the ends of plates C are projected. These plates C7 are fastened by
screws in recesses in the mold-ring B and are for the purpose, of rendering the
mold-ring and the screw ring inseparable while permitting the rotary adjust-
ment or turning of the ring C in the ring B.
By means of handle H connected with the mold-ring B, the rings B and C
may be lifted off the base A, together, and the ring C is provided with a crank
extension G. by which, when the ring B is held by means of the handle H,
the screw-ring C can be rotated.
The operation of this improved glass-mold is as follows: The base-piece A
being set on the glass-press in the proper position, the mold-ring B with attached
screw-ring C which latter is always in right operative position. is placed on
the base-piece A as above described. A suitable quantity of molten glass is
dropped into the cavity of the mold through the screw-ring C, and then the
plunger D is lowered, which causes the glass to fill the cavity of the mold. The
Screw-cap, being thus formed is readily removed from the mold. The plunger D
is first withdrawn, then the rings B and C are lifted off the base A taking the
newly formed cap with them. The rings B and C are set down on any suitable
level surface as the table of the glass-press and while the mold-ring B is held
stationary by means of its handle the screw-ring C is rotated by means of its
crank. The glass cap E cannot rotate because of the corrugations of its rim,
consequently it is forced down by the action of the rotating screw-ring on its
threaded part and will be dropped upon the table as soon as the threads on the
cap are released from the screw-ring. The operation being complete the parts
are replaced by simply setting the mold-ring back in place on the base A when
the mold is ready for a repetition of the operation.
The advantages are apparent. There is no screwing of the parts together;
the base remains in place under the plunger to insure a register of the plunger
with the openings through the removable rings and the operation of removing
the glass cap from the mold is simple and quick.
Having now particularly described and ascertained the nature of the said
invention, as communicated to me by my foreign. correspondents, and in what
manner the same is to be performed, I declare that what I claim is:
1. In a glass-mold, the combination of the mold-base, the mold-ring seated
thereon and having a central hole with means to prevent rotation of the glass
article therein and means to be grasped by the hand to prevent the rotation
of the mold-ring, and the screw-ring revolubly mounted in the mold-ring and
having a central opening of two diameters, the larger being inside and forming
a shoulder with the smaller outside part of said opening and the walls of the
inside portion being screwthreaded, substantially as described.
2. In a glass-mold, the combination of the mold-base, the mold-ring seated
thereon having a central hole with indents or means for preventing rotation
of the glass article therein, the screw-ring mounted in the mold-ring and having
a central opening the lower or inner portion of which is screw-threaded, and
means for connecting the screw-ring to the mold-ring to permit rotation but
not separation, substantially as described.
3. In a glass-mold, the combination of the mold-base the mold-ring seated
thereon said mold-ring having a vertical bore with indents or the like to prevent
rotation of the glass article therein, the screw-ring mounted in the mold-ring
and having a central bore or hole screw-threaded at its lower or inner portion,
means for lifting the two rings off of the base together and for rotating the
screw-ring while holding the mold-ring against rotation, and a plunger arranged
to reciprocate through the hole in the screw-ring, substantially as described.

page_text: 4. In a glass-mold, the combination of the mold-base having an annular
groove near the edge of its upper surface, a mold-ring having a flange to fit in
the grooved base and having a corrugated central opening and a larger circular
opening concentric with and above the corrugated opening, said ring having a
handle, a screw-ring fitting in the larger upper opening of the mold-ring, the
central opening of the said screw-ring having approximately its lower half
enlarged in diameter and having the walls of said larger part screwthreaded said
screw-ring having a flange to rest on the top of the mold-ring and said
screw-ring having a circumferential groove under said flange and said ring having
a crank handle, a locking plate or plates secured to the mold-ring and entering
the grooves in the screw-ring and a plunger arranged to reciprocate through the
hole in the screw-ring, substantially as described.
Dated this 5th day of March 1900.
BOULT, WADE & KILBURN,
Agents for the Applicant.