IMPROVEMENTS IN " IN APPLIANCES FOR MOULDING OR PRESSING SCREW FORMS OR THREADS PLASTIC MATERIAL
Year: 1883

page_text: LETTERS PATENT to Dan Rylands of Hope Glass Works Stairfoot near
Barnsley in the County of York, for an Invention of "IMPROVEMENTS IN
"
IN
APPLIANCES FOR MOULDING OR PRESSING SCREW FORMS OR THREADS
PLASTIC MATERIAL the result partly of a communication from abroad
made to him by Homer Brooke of the City & State of New York U.S.A.
PROVISIONAL SPECIFICATION left by the said Dan Rylands at the Office
of the Commissioners of Patents on the 26th October 1883.
"
DAN RYLANDS of Hope Glass Works Stairfoot near Barnsley in the County
of York. "IMPROVEMENTS IN APPLIANCES FOR MOULDING OR PRESSING SCREW
FORMS OR THREADS IN PLASTIC MATERIAL [the result partly of a communication
from abroad made to him by Homer Brooke of the City & State of New
York U.S.A. and partly of invention and discovery made by him]
This invention is specially adapted for overcoming the difficulty heretofore
experienced in moulding or pressing screw threads in plastic material such as
glass, clay or other such material. This difficulty has been caused by the tendency
which the glass or clay has of setting and becoming fast on the screw threads of
the die used for pressing the same, and when the die is withdrawn it drags or
disturbs the screw.
According to this invention this difficulty is overcome by giving the die
a backward or withdrawing motion simultaneously with its forward or entering
motion into the plastic material and thus removing all danger of breaking dragging
or disturbing the screw. This is accomplished by attaching to the frame of the
machine a crosshead through which a spindle works in which is cut a screw thread.
working into a corresponding screw thread on the said bar and also working
through an enlargement on top of frame. An L shaped lever is also attached
outside of the middle of the cross head which has its fulcrum on one side of the
frame in the centre of a toggle joint. This L shaped lever is also provided with

page_text: a pole which is held by a spring or other suitablo motion to the ratchet teeth
formed on side of frame, the upper part of this L shaped lever is provided with
a slot fitting upon a pin in top bar which top bar is provided with ratchet teeth
working a pinion fitting loosely on the screw threaded spindle.
Suitable mechanism is arranged for working in conjunction with the mechanical
arrangements before described and thus secure at one time the two simultaneous
motions giving the plunger or die simultaneously a pressing motion into the plastic
material and at same timo a backward outward motion. This arrangement may
be used with specially shaped moulds so as to make a larger quantity of screw
forms or threads than is usually made at once. For this purpose the mould is
made in sections working on horizontal pins each section being fastened to the
other by means of toggle joints at the ends and the mould is opened and shut by
means of a screw handle.

page_text: said clutch H, is carried around with the revolutions of the said spindle B. S is a
spring holding said clutch in contact with the pinion G.
M is a mould, holding the plastic material and L is the upper part or cover to
the said mould M held in position by any suitable means.
N is the material in which the screw is to be formed, and P the plunger or
former on the lower end of the spindle B, which forms the screw thread in the
material.
O is a balance or hand wheel placed on the upper end of the spindle B. . Q is a
balance weight to balance the L-shaped lever C, c.
The mode of operation of my improvement (with respect to Figures 1 and 2) is
as follows.-
The material in which the screw thread is to be formed being placed in the
mould, M, the lever C is pressed downward, carrying with it the crosshead D, with
its engaged spindle B, and the plunger or former P, pressing the latter into the
material, the toggle joint formed by the shorter arui c of the lever C, and the
bar E permitting a perpendicular movement of the spindle B by means of
the attachment of the lever C to the crosshead D. At the same time the
downward movement of the short arm c of the lever C sets in operation the
rack on the bar F, which, engaging with the pinion G, communicating motion
to the collar E, causes the spindle B, to revolve, in an upward direction, these two
simultaneous motions giving the plunger or former P, a pressing motion into the
material, and at the same time a backward outward motion. When the former or
plunger P has penetrated sufficiently into the material to make the proper form
therein, the pressure on the lever C is stopped, and the pawl I, engaging with the
ratchet teeth on the frame A, holds the lever in position. At the same time
the upward backward motion of the spindle B, is continued by the continued
revolution of the balance or hand wheel O, and this being further increased
by the hand of the operator, the plunger or former P is backed entirely out of the
inaterial.
Figure 3 is a plan, Figure 4 a longitudinal section on the line X, X, of Figure 3.
Figure 5 is a front elevation and Figure 6 a side elevation of my improved mould
for making a large quantity of screw forms or threads at once.
The sections a, a, a, a, a, a, work on the two horizontal pins d, d, and are
connected to each other by means of the joints e, e, e, e, e. The screw works
'through and screws into the cross bar m, in which is formed a thread to correspond
with the thread of the screw j. One end of the screw i has a hand wheel p, keyed
or fastened thereon, the other end is attached to the section a, by means of the
*small plate r. The moulds or hollows a', a¹, a', made between the sections a, a, a,
'may be of any desired shape, for instance, thoy may be made in the form of
threads, so that the plastic material may have an external screw form as well as
an internal one. The sections a, a, a, are placed on the bottom plate T. The mode.
of operation with respect to Figures 3, 4, 5 and 6 is as follows.―-
The material in which the screw thread is to be formed is placed in the several
moulds a¹, a¹, a', it is then pressed therein by means of the plunger or former P,
Figures 1 and 2 in the manner as herein before described after which the upper
part or sections a. a. a. is lifted off or from the under part or plate T, and is carried
and placed over a box or any suitable receptacle.
The hand wheel p is then turned in one direction, it being secured or keyed
onto the screw j, causes the said scrow j to rotate within the nut or threads formed
in the cross bar m, the other end of the screw j being attached to the section a,
pulls that section towards the cross bar m, and the aforesaid section a, being
connected to the next section a, by means of the joints e. e. also pulls that section a,
in the same direction, and so on with all the sections a, but the first section a, that
is the one with the screw j attached thereto, moves away from the second section a,
a distance allowed by the joints e, e, before it pulls that (the second section a,)
with it, and so on with the rest of the sections a, When the hand wheel p, is or
has been turned sufficient to withdraw the sections a. a. a, a distance apart

page_text: permitted by the joints e. e. the several screw forms made within the moulds a¹ a¹
drop or fall out into the receptacle placed below. The hand wheel p. is then
turned in a reverso direction, thus closing all the sections a a in which position
it may again be placed on the lower plate T, in which place it is ready for more
screw forms to be made.
Having thus described the nature of my invention and in what manner the same
is to be performed, I would have it understood that I claim as the improvement
secured to me by the herein before mentioned Letters Patent.-
First. My improved appliance for moulding or pressing screw forms or threads
in plastic material consisting of a screw die which at the same time that it is
pressed forward into the plastic material has a backward or withdrawing rotary.
motion imparted to it.
Second. A machine for forming screw-threads in plastic material, consisting of
an upright frame having a weighted cross-lever pivotted at one side of said frame
and held in place by pawl and ratchet at the opposite side, a screw threaded
spindle vertically journalled through the top of said frame, and having a hand
wheel on its outer end, coiled springs, guide rods, cross bar, and pinion, with
suitable clutches, a cross head below the lever, through which the rods and spindle
pass, and a mould secured below said spindle, for holding plastic material, said
mechanism adapted to give a simultaneous vertical, rotary, and reverse movement,
as shown and specified.
Third. The combination of the frame A, the L-lever C, cross-head D, vertical
spindle B, hand wheel O, cross arm F, collar clutch H, rods f, spring S, connections c,
pinion G, key h, and plunger P, with the plastic material N, mould M. and top or
cover L all arranged and operated substantially as herein before described with
reference to Figures 1 and 2.
Fourth. A mould wherein may be made a larger quantity of screw forms or
threads than is usually made at once, consisting of sections working or moving
on horizontal pins and having a screw spindle working in a cross bar having
a hand wheel at one end and attached to a section at the other with joints
connecting the said sections together and having a bottom plate on which the
sections rest.
Fifth. The combinations of the sections a. a. a. a. a. a. horizontal pins d, d,
screw spindle j, hand wheel p, cross bar m, joints e, c, e, e, e. and bottom plato T,
all arranged and operated substantially as hereinbefore described with reference to
Figures 3 to 6.
In witness whereof I the said Dan Rylands have hereunto set my hand and
seal this Twenty fifth day of April in the year of our Lord One thousand eight
hundred and eighty four.