A. Method and Means for Producing Mica Rings or Disks, suitable principally for Insulating Purposes.
Year: 1893

page_text: Date of Application, 31st Jan., 1893
Complete Specification Left, 1.th Oct., 1893-Accepted, 18th Nov., 1893
PROVISIONAL SPECIFICATION.
A. Method and Means for Producing Mica Rings or Disks, suitable
principally for Insulating Purposes.
1 REGINALD HADDAN of the Firm of Herbert Haddan and Co. of 18 Buckingham
Street Strand W.C. London Patent Agent do hereby declaro the nature of this
invention a communication to me from abroad by Charles W. Jefferson of
Schenectady, State of Now York United States of America Electrician to be as
follows:-
The object of this invention is twofold. First to provide a process for moulding
mica scales, and consisting in building a mica sheet by cenienting together lumine
of mica scales with overlapping edges, compressing the sheet into the desired form
while the cement is wet, drying the cement by evaporating the solvent thereof
and finally chilling the moulded micn sheet while under compression. Secondly
the object is to construct a mould which may be employed in carrying out the
invention.
Inasmuch as the mould is intricate in shape and function drawings are annexed
which will show in connection with the description the nature of this invention.
The device embodying the invention consists of the combination of the core a in
the form of a ring having rounded edges, whore it fits into a corresponding
groove in the upper part of the ring c. In this groove and between the core a
and moulding ring c is the mica flanged ring d compressed from the annular disk d'.
The under surface of the ring c is flat except for the spiral groove e, and fits
upon the aunular plate 'in such a manner that the groove e becomes a conduit
having an entrance at g and exit at y'. A gasket h is placed between the plate ƒ
and ring e and all are clamped together by bolts i.
It is evident that the conduit e may be used for the passage of hot or cold fluide,
as for example, cold water or steam.
The operation consists in placing the disk in the groove 6 of the ring c and
applying the core a under pressure. In order that the result of the operation may
be successful the following preliminaries should be known. The disc d' is built up
of a series of mica scales, forming one ring and overlapping one another, a second
series of mica scales j arranged in a smaller circle and overlapping one another, the
scales in each ring being short strips radiating from the centre of the annular disc.
Joining the two rings formed of the strips jaro overlapping strips jil over-
lapping at their ends, and overlapping the ends of the strips. The dotted lines
indicate the overlapping joints. All the pieces are held to one another by a cement
preferably copal varnish or shellac.
While the cement is still soft, the disk is placed in the groove b and pressure
applied. When the sheet or disk d' is bent over by the former, or core a the
individual scales of mica, of which the disk is composed slide upon one another and
do not buckle up as when a sheet of a single piece is employed. Heating the mould
by he passage of the hot water or steam through the conduite dries out the
solvent of the cement, which is still wet when the disk d' is first put into the mould.
Soon, cold water is passed through the conduit e to act, the mica. The chilling by
this means causes the flanged ring d to have a permanent set. The ring d may be
employed in the Gramme ring armature for the purposes of insulation. In practice
several layers of disks d' are superposed and cemented together and moulded while
green or wet and then chilled, thereby forming thick and strong insulating flanged
rings.
Dated shi
T

page_text: COMPLETE SPECIFICATION.
A Method and Means for Producing Mica Rings or Disks, suitable
principally for Insulating Purposes.
1, REGINALD HAddan, of the Firm of Horbert Haddan & Co., of 18 Buckingham
Street, Strand, W.C., London, Patent Agent, do hereby declare the nature of this
invention, a communication to me from abroad by Charles W. Jefferson of
Schenectady, in the County of Schenectady, and State of New York, United
States of America Electrician and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
The object of my invention is twofold :---
First, to provide a process for moulding mica scales, and consisting in building
a mica sheet by cementing together lamina of mica scales with overlapping edges,
compressing the sheet into the desired form while the cement is wot, drying the
cement by evaporating the solvent thereof, and finally chilling the moulded mica
sheet while under compression.
Secondly, , my object is to construct a mould which may be employed in carrying
out the invention.
Inasmuch as the mould is intricate in shapo and function, the drawings filed with
the Provisional Specification will show in connection with the description all the
details which I have invented to date.
The device embodying my invention, consists of the combination of a core a, in
the form of a ring having rounded edges, where it fits into a corresponding groove b₂
in the upper part of the ring o. In this groove, and between the, coro u, and
moulding ring c, is the mica flanged ring d, compressed from the annular disc d
The under surface of the ring c, is flat, except for the spiral groove e, and fits
upon the annular plate, in such a manner that the groove e, becomes a conduit
baving an entrance at g, and exit at g'. A gasket . is placed between the plateſ,
and ring c, and all are clamped together by bolts i.
It is evident that the conduit e may be used for the passage of hot or cold fluids,
as for example, cold water or steam.
The operation consists in placing the disc d' in the groove b, of the ring o, and
applying the core a, under pressure. In order that the result of the operation may
be successful the following preliminaries should be known. The disc d', is built up
of a series of mica scales, forming one ring and overlapping one another, a second
series of mica scales, arranged in a smaller circle and overlapping one another; the
scales in each ring being short strips radiating from the centre of the annular disc.
Joining the two rings formed of the strips j, are overlapping strips overlapping
at their ends and overlapping the ends of the strips j, jª. The dotted lines
indicate the overlapping joints. All the pieces are held to one another by a cement,
preferably copal varnish or shellac.
.
While the cement is still soft, the disc is placed in the groove b, and pressure
applied.
When the sheet or disc d', is bent over by the former or core a, the individual
scales of mica, of which the disc is composed slide upon one another and do not
buckle up, as when a sheet of a single piece is employed.
Heating the mold by the passage of hot water or steam through the conduit e,
dries out the solvent of the cement, which is still wet when the disc d', is first
put into the mould. Soon, cold water is passed through the conduit e, to set the
mica. The chilling by this means, causes the flanged ring d, to have a permanent set.
The ring d, may be employed in the Gramme ring armature for the purposes of
insulation. In practice several layers of discs d', aro superposed and cemented
together and molded while green or wet, and then chilled, thereby forming thick
and strong insulating flanged rings.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
olaim is :
1. A mold for forming and setting laminated mica sheets, consisting of an annular
plate, an annular plate c, having a spiral groove extending from its outer to its
inner periphery clamped to the plate, in such relative positions that the groove
becomes a conduit, closed except at the ends and having a curved groove b. for
containing the laminated and cemented mica scales, a core u. fitting in the groove b,
and means for preventing leakage, consisting of a gasket at and between the outer
poripheries of the rings c and f
2. The hereinbefore described process of bending and setting mica sheets,
Consisting in building a mica sheet by cementing together lamins of mica scales
with overlapping edges, compressing the sheet into the desired form while the
cement is wet or soft, and finally chilling the molded mica sheet while under
compression.
DL J...
1000
R. HADDAN,
Of the Firm of Herbert Haddau & Co.,
18, Buckingham Street, Strand, W.C., Agent for Applicant.