Improvements in Apparatus for Moulding Glass and other Insulators.
Year: 1891

page_text: Date of Application, 10th Nov. 1891-Accepted, 24th Dec, 1891.
COMPLETE SPECIFICATION.
[Communicated from abroad by LAWRENCE B. GRAY, of Boston, Massachusetts,
United States of America.]
Improvements in Apparatus for Moulding Glass and other
Insulators.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention and in what manner the same is to be performed, to he
particularly described and ascertained in and by the following statement:―
The invention relates especially to the portion of the press known as the plunger
case and plunger and particularly to the construction of the plunger whereby it is
adapted to be easily removed from the moulded insulator after it has formed" a
screw thread therein.
The plunger is of the kind known as a sectional plunger. It is made in four
principal parts or pieces which are arranged to be moved in pairs and each of
which contains a section of a screw thread. Each of the two pairs of sections has
the same movements and they are formed or arranged in operative positions as
follows:-
One pair of the plunger sections is loosely attached to the case and moved'
downward with it and the other pair of plunger sections is attached to an actuating
block carried by a rod or spindle. The downward movement of the case moves
the first pair of sections into the mould but does not spread them. This spreading
movement is accomplished by an actuating block carried in the case and moved by
the said rod or spindle upon its downward movement into contact with the first
named pair of sections, thereby spreading them. The vertical movement of the
rod and actuating block carried thereby and the second pair of plunger sections is
continued until they are upon a line with the first pair, when by the further move-
ment of the plunger and actuating block, they are spread or moved laterally:
In removing the plunger from the moulded material, without spreading the screw
thread which it forms, the actuating rod and its block are moved' upward. This
causes the pair of plunger sections secured to the said block to be first closed"
laterally and to be then moved upward vertically and the rod still moving upward
comes in contact with the actuating block which actuates the said first named pair
of plunger sections and closes them laterally together, and' the upward vertical'
movement of the case and its attachments removes said last named' plunger sections
from the mould or moulded insulator.
In the accompanying drawings,
Figure 1 is a view of the plunger case and' plunger in vertical section upon the
dotted line-x of Figure 3.
Figure 2 is a vertical section of the plunger case and plunger showing the parts
in a different position from that shown in Fig. 1.
Figure 3 is a horizontal section of the plunger case and plunger upon the dotted*
line - of Figure 1.
Figures 4, 5 and 6, illustrate in vertical section various positions of the parts to
which, reference will be hereinafter made.
Figure 7 is, a view in plan of the end of the plunger inverted:
A represents the plunger. case. It is preferably cylindricali in form and its ends
are alosed by the. heads or caps a a'. The case. A contains a movable-head or
block B.and a movable block C. The block. C'is attached to the lower end of a
rod or spindle c-which extends upward through a hole b in the upper end 6 of the
block B, and through the hole a in the case head a, see Figure 1
་

page_text: The block C has its sides c c¹ parallel from its upper end c², see Figure 5, to its
lower end and its sides c c inclined from its upper end downward to the
point, see Figure 2, and from the point c to the end c³ the sides c c are parallel,
see Figure 2. On or in each of the inclined faces e c, there is a dovetail
groove c³ clo, see Figure 3, and these dovetail grooves receive the dovetail
tongues d d of the members D D₁ of the sectional plunger. Each of the
members D D is shaped as represented in Figure 2, that is, it has the upper
section d² having the straight outer edge ³ curved to fit the cavity 62 of the
movable head B and the inclined inner face d₁ from which the tongue extends.
The sections are of the width of the wedge block C. From each of the sections
extend the straight threaded extensions or sections do do and the lower end of each
threaded extension or section has an inwardly extending foot d' the upper face d³
of which is inclined. The two members Ď D' are movable vertically with the
wedge C to the lower end of the case, when their vertical movement is stopped and
an opening or lateral movement given them. The movable head B has two down-
wardly extending sections or ends 6³ 64 see Figure 5, each of which has the inclined
face or surface 65 see Figure 5, in which is a dovetail recess 6 and these dovetail
recesses 66 receive the dovetail tongues e e¹ of the members E E¹ of the plunger,
each of these sections having the section or upper end e² provided with an inclined
inner face e³ from which the tongue above referred to extends and the recess e* in
its outer face, see Figure 5, which is inclined from the shoulder upward and
outward. These recesses receive the inclined stops a³ extending from the inner
surface of the case A. The lower portions e of these members E E¹ of the
plunger are threaded. From this it will be seen that the members E E¹ of the
plunger are attached to the case A and are vertically movable with it and not with
the movable head B, and that the movable head B is movable in the case A to
separate or bring together the members E E¹ but not to otherwise move them.
The operation the complete device is as follows:
The parts prior to their downward movement have the position represented in
Figures 4 and 6. That is, the rod C has been moved upward sufficiently to bring
the movable head B to the upper end of the case and the case sufficiently
elevated to remove the members E E' of the plunger from the mould. To then
form the plunger, in the mould, the case and the rod e are moved downward. This
causes the wedge block C and the members D D' of the plunger to be moved down-
ward and also the movable head B. This downward, movement of the movable
head B spreads or separates the members E E' from their position represented in
Figure 6 to that represented in Figure 5, and the movable head B then comes to
rest. The movement of the wedge block C and members D D' of the plungers
continues until the stops do d' upon the members D D' come in contact with the
upper surface of the lower cap a¹ of the case at which time the lower ends of the
threaded sections are upon a line with the lower ends of the threaded sections of
the members E E¹ when they came to rest so far as their vertical movement is
concerned but by the further movement of the block G they are spread apart or
moved horizontally from their closed position represented in Figure 4 to the
position represented in Figure 1, the lower end 3 of the plunger coming in contact
with the inclines ds upon the lower ends of the said sections and assisting in the
spreading or opening movement.
The plunger is then used in the ordinary way in which said plungers are
employed in moulding the insulator and is then removed from the moulded material
as follows. The upward movement of the rod c and its connected wedge block C
first draws the members D D' inward towards each other, this inward movement
of these members being due to their dovetailed tongue and groove connections with
the inclined faces of the wedge block C and to the fact that the portions 6' of said
head serves as stops to prevent their upward movements. When these members
have become closed against the straight lower portion of the said block and have
been moved inward so as to clear the portions 67 of the movable head B to
positions which will permit them to enter the cavity 2 of said head the continued

page_text: upward movement of the rod c and wedge block C lifts the closed members D D'
to the position shown in Figure 2 where the upper ends of said members and of the
wedge block C are shown as being in contact with the upper portion b¹ of the
movable head or block B. The further upward movement of the rod c and wedge
block C causes the head or block B to be lifted in the case A and owing to the
dovetailed tongue and groove connections of the upper portions of the members E
and E' with the inclined lower part of the head or block B the said members are
now drawn together from the positions shown in Figure 5 to the positions shown in
Figure 6; the stops a³ on the case A engaging the lateral projections e' on the
members E and E' and by thus preventing them from rising in the said case A.
compel them to move towards each other, thus freeing them from the moulded
insulator, and the case A may then be lifted from the mould.
It will be understood that the device can be used for forming threads or under-
cut recesses or formation in any mouldable material.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed as communicated to me by
my foreign correspondent, I declare that what I claim is :-
First. In a press for moulding insulators the combination with a case A having
stops a³ of a head or block B movable in said case and having downwardly
extending parts 63 64 with inclined surfaces 6, the plunger members E E¹ the upper
part of which have dovetailed tongue and groove connections with said parts 664
and said members having projections e beneath said stops, the wedge block C, its
operating rod c and the plunger members D D' having dovetailed tongue and
groove connections with the inclined faces of said wedge block, substantially as set
forth.
Second. In a press for moulding insulators, the combination with a case A of a
sectional plunger consisting of two parts or members E E' movable laterally in
said case but held from longitudinal movement therein, and two members D D'
longitudinally and laterally movable in said case, a longitudinally movable head or
block B for operating said members E and E', and a longitudinally movable
wedge-block C for operating said members D D' and said head or block B.
Third. The combination with the case A, of the head or block B movable in
said case and having the recess 62 of the plunger members D D' longitudinally and
laterally movable in said case and arranged, when lifted, to enter at their upper
parts in said case, the plunger members E É laterally movable in said case but
held from longitudinal movement therein, said members E E' having dovetailed
tongue and groove connections with said head B and said members D D¹ having
similar connection with said wedge block C.
Fourth. The combination of the case A, having the stops a³ with the plunger
members E E¹ having the shoulders e and sections e shaped as specified with the.
actuating head or block B shaped and connected with the said section e³ as specified
as and for the purposes described.
Fifth. The press for moulding threads in glass and similar insulators and other
mouldable material herein shown and described.
Dated this 10th dow of November 1901
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.