Improvements in Electrical Switches, Fuzes, Ceiling Plates, Wall Connectors, and the like.
Year: 1893

page_text: Date of Application, 7th June, 1893-Accepted, 15th July, 1893
COMPLETE SPECIFICATION.
Improvements in Electrical Switches, Fuzes, Ceiling Plates, Wall
Connectors, and the like.
We, CHARLES MARK DORMAN, of Ordsal Electrical Works, Salford, in the
County of Lancaster, Electrical Engineer, and REGINALD ARTHUR SMITH, of
Ordsal Electrical Works, Salford, in the County of Lancaster, Electrical Engineer
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:-
Our invention relates to those electrical fittings where conducting metallic parts
are attached to an insulating base of porcelain, slate or other similar materials.
The object of our invention is to enable the fittings to be made without any
metallic parts projecting through at the back of the insulating base, and also, at
the same time, without any screw threads tapped into the front of the insulating
base.
To carry out our invention we form suitable recesses in the front or upper
surface of the insulating bases; into these recesses we introduce either metallic nuts
or metallic studs and hold them there by means of pins or screws which are passed
inwards from the outer edge of the bases through suitable holes provided in the
bases, the said pins or screws also passing through the nuts or studs. The metallic
parts of the fittings may then be held down firmly on the insulating bases by means
of screws screwed into the nuts, or by means of nuts screwed on to the studs.
Referring to the drawings
Fig. 1. and Fig. 2 shew two insulating bases a 1. a 2. in section. 61. 6 2. 63. are
the metallic conducting parts of the fittings. c 1. c 2. are metallic nuts or internally
screwed bushes which are sunk into the upper surface of the bases. d shews a
metallic stud also sunk into the upper surface of base. The nuts c 1. c 2. and also
the stud d are held in the base by means of pins or screws e 1. e 2. e 3. which are
passed inwards from the outer edge of the insulating bases through both base and
nut or stud, thus forming a cotter which prevents the nut or stud from being
withdrawn from the base. These pins can if desired be screwed into the nut or
stud as shown in the case of e 2.
The metallic parts of the fittings 61. 62. are held down on the bases by means of
the screws 1.2. screwed into the nuts c 1. c 2. The metallic part 63 is beld
down on the insulating base by means of the nut g screwed on the upper end of the
stud d.
It is desirable that the tunnels for the pins or screws are so placed that their
open ends, on the edge of the bases are hidden by the cover of fittings when
placed in position, as shown in drawings. The metallic conducting parts of
fittings 1. 2. 3. are shown in drawings as thin plates, but it is obvious that by
making the screws or studs longer any form of metallic piece or terminal may be
held on the base.
It is also evident that the upper end of the screws or studs which hold down the
conducting parts may be prolonged if desirable for the attachment of other
insulated parts of the fittings thus the screw 'l is formed into a peg for a switch
arm to revolve upon.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is.
1. The method of attaching the metallic parts of switches fuzes, ceiling plates,
11

page_text: internally screwed bushes sunk into the upper surface of the insulating bases and
held there by means of pins or screws which are passed inwards from the outer
edge of the insulating bases through suitable holes provided in the bases, the said
pins or screws also passing through the nuts or tubular bushes; the metallic parts
of the switches etc. being held down on the bases by means of screws screwed into
the nuts or tubular bushes, substantially as described & shown.
2. The method of attaching the metallic parts of switches, fuzes, ceiling-plates,
wall connectors & the like to the insulating bases by means of metallic studs sunk
into the upper surface of the insulating bases and held there by means of pins or
screws which are passed inwards from the outer edge of the insulating bases
through suitable holes provided in the bases, the said pins or screws also passing
through the metallic studs; the metallic parts of the switches etc., being held
down on the base by means of nuts screwed on to the studs substantially as described
and shown.
nh: th th of Tuna 1002
CHARLES MARK DORMAN.
REGINALD ARTHUR SMITH.