Improvements in, or Additions to, the Covers or Casings of Switches, Cut-outs, Ceiling Roses, and other Electrical Fittings.
Year: 1897

page_text: Improvements in, or Additions to, the Covers or Casings of Switches,
Cut-outs, Ceiling Roses, and other Electrical Fittings.
I, THOMAS TAYLOR, of the Firm of Taylor, Tunnicliff and Company, of Eastwood,
Hanley, in the County of Stafford, Manufacturer, do hereby declare the nature
of this invention to be as follows:-
-
This invention relates to the covers, casings or enclosures of electrical switches,
cut-outs, ceiling roses and other analogous electrical fittings. Usually such
covers or casings are made either wholly of metal, or wholly of stone ware or
porcelain and those made wholly of metal are liable to become a medium for
Short-circuiting and sparking, and owing to this serious defect, such metallic
covers have been condemned and their use prohibited by many electrical corpora-
tions.
The object of my invention is a composite cover, comprising a metal outer
shell lined with some non-electricity-conducting material such as earthenware,
porcelain, glass, vulcanite or the like, whereby the polished metallic appearance
of the article is preserved and at the same time the cover is rendered perfectly
safe.
In carrying out one form of my invention in connection with a switch cover,
I take a metallic outer shell having a pierced crown with the metal surrounding
the piercing drawn down into a sleeve which is interiorly wormed to take upon
the summit of the switch bridge, and through which hole the operating lever
extends Fitted within the interior of the said shell is a porcelain, glass or
other vitreous lining, preferably being of the same shape as the inside of the shell'
and having an axial hole through its crown and at its lip or bottom edge, a slight
annular shoulder or beading, over which the extreme bottom edge of the metal
shell is turned, rolled or spun, thus securing the lining within the metal shell,
or the outer shell to the lining. It is understood that the hole in the crown of
the lining surrounds the depending sleeve at the neck of the cover, and that the
lip at the bottom edge of the lining is not necessary, as the metal at the edge of
the cover may be turned over the plain adjacent edge of the lining.
As another form of my improvements, I make the lining to constitute the body
of the switch cover, and provide the same with an outwardly extending beaded lip
at the bottom edge, and form also an axial hole in the crown, as before, where-
through the depending and inside screwed sleeve of a metallic cover, whose lower
edge rests upon the beading of the lining, inwardly passes. The cover is secured
to the lining by rolling, spinning or expanding the thin metal lower edge of the
sleeve over the interior part of the lining surrounding the hole in the crown.
the lining and cover may be secured together by an independent and interiorly
wormed eyelet threaded through the coincident holes in the crowns, with the top
and bottom edges spun or rolled respectively over the surrounding parts of the
Or

page_text: metallic shell and non-conducting lining, or a metal ring may be spun or rolled
over the beaded edge of the lining and a flanged lower edge of the cover.
I do not confine myself to the particular methods of securing together the cover
and lining, as the metal of the cover may be impressed into annular or other
grooves or indentations in the outer surface of the lining Further, the appli-
cation of my invention to the covers of cut-outs, ceiling roses and the like differs
in no essential respect from its application to switch covers as herein described.
Improvements in, or Additions to, the Covers or Casings of Switches,
Cut-outs, Ceiling Roses, and other Electrical Fittings.
2.
1.1. ai ¼
I, THOMAS TAYLOR, of the Firm of Taylor, Tunnicliff and Company, of Eastwood,
Hanley, in the County of Stafford, Manufacturer, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:
.
This invention relates to the cover, casings or enclosures of. electrical switches,
cut-outs, ceiling. roses, and.. other... analogous electrical fittings... Usually - such
covers or casings are made either wholly of metal or wholly of stone ware.or
porcelain, so that: when made of metal, they are liable. to; become a medium for
short-circuiting and sparking, owing to which. serious defect, such metallic covers
have been condemned and their use prohibited by many electrical. corporations,
whilst when made entirely of porcelain they are liable to be easily.broken and are
not of such good appearance as metal covers.
The object of my invention is a composite cover, comprising a metal outer shell
lined with some non-electricity-conducting material, such as earthenware, porce-
lain, stoneware of the like, whereby the polished metallic appearance of the article
is preserved and at the same time the cover is rendered perfectly safe.
י די
Figure represents a cross section of one form of my. invention as applied-to
the cover of a tumbler switch, in the construction of which, I take a metallic
outer shell a, having a pierced crown a¹, with the metal surrounding the piercing
drawn down into a sleeve a², which is interiorly wormed to take upon the summit
if the switch bridge, and through, which hole the operating lever extends. Fitted
within the interior of the said shell is a porcelain, glass or other vitreous lining. b,
preferably being of the same shape as the inside of the shell and having an axial
hole, through its crown and at its lip or bottom edge 62, a slight annular
shoulder or beading, over which the extreme bottom edge.a³, of the metal shell
is turned, rolled or spun, thus securing the lining within the metal shell, or the
outer shell to the lining. It is understood that the hole in the crown of the lining
surrounds the depending sleeve at the neck of the cover, and that (as shown in
Figure 2) the lip at the bottom edge of the lining is not necessary, as the metal
at the bottom edge a³, of the metal cover a, may be turned over the plain adjacent
edge b2, of the vitreous lining b.
As another form of my improvements which is represented partly in section,
and partly in elevation in Figure 3, I make the lining b, to constitute the body
of the switch cover and provide the same with an outwardly extending beaded

page_text: lip 62, at the bottom edge, and form also an axial hole b¹, in the crown, as before,
wherethrough the depending and inside screwed sleeve a², of the metallic cover,
whose lower edge a³, rests upon the beading of the lining, inwardly passes. The
cover is secured to the lining by rolling, spinning or expanding the thin metal
at the lower edge a5, of the sleeve a², over the interior part of the lining sur-
rounding the hole 6¹ in the crown. Or the lining and cover may be secured
together (as represented in Figure 4) by an independent and interiorly wormed
eyelet c, threaded through the coincident holes a¹, 61, in the crowns with the top
and bottom edges c¹, c³, of the same spun or rolled respectively over the sur-
rounding parts of the metallic shell and non-conducting lining, or a metal ring c,
may (as represented in Figure 5) be spun or rolled over the beaded lower edge 63,
of the lining, and a flange a6, at the lower edge a³, of the metal outer shell
or covering a.
I do not confine myself to the particular methods of securing together the
cover and lining, as the metal of the outer shell a, may be impressed into annular
or other grooves or indentations 65, in the outer surface of the lining b, as repre-
sented in Figure 6. Further, the application of my invention to the covers of
cut-outs, ceiling roses and the like differs in no essential respect from its appli-
cation to switch covers as herein described.
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
claim is:-
First: A composite cover or casing for switches, cut-outs, ceiling roses and
other electrical fittings, consisting of an inner lining of vitreous porcelain or
other non-electricity-conducting material, and an outer metallic shell.
Secondly: A composite cover or casing for switches, cut-outs, ceiling roses and
other electrical fittings, consisting of an inner lining of vitreous or other non-
electricity-conducting material, and an outer metallic shell, with the said shell
being secured to the lining by turning, spinning or closing parts of the metal
of the same around or into parts of the said lining, substantially as described and
set forth in Figures 1, 2, 3 and 6.
Thirdly: A composite cover or casing for switches, cut-outs, ceiling roses and
other electrical fittings, consisting of an inner lining of vitreous or other insulating
material and an outer metallic shell, said lining and shell being secured together
by a separate eyelet or sleeve, threaded through coincident holes in the crowns
of the said shell and lining, the inner and outer ends of which eyelet are turned,
spun or rolled respectively over surrounding parts of said shell and lining, sub-
stantially as described and set forth in Figure 4.
Fourthly: A composite cover or casing for switches, cut-outs, ceiling roses and
other electrical fittings, consisting of an inner lining of vitreous or other insu-
lating material and an outer metallic shell, said lining and shell being secured
together by a metal ring spun or rolled over a beaded lower part of the lining and
a flanged lower edge of the shell, substantially as described and set forth in
Figure 5.
1000
THOMAS TAYLOR.
By Henry Skerrett,
24, Temple Row, Birmingham,
Agent for Applicant.