Improvements in Electrical Out-outs or Safety Fuses, Switches, and the like.
Year: 1895

page_text: Date of Application, 9th May, 1895-Accepted, 22nd June, 1895
COMPLETE SPECIFICATION.
Improvements in Electrical Out-outs or Safety Fuses, Switches, and
the like.
I JOHN BENIAMIN VERITY of Plume Works, Aston, in the County ol
Warwickshne, 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.
My invention relates to the method of attaching terminals to clectical cut-outs,
switches, ceiling roses, and the like, and consists in the herein described improve-
ments In electric cut-outs, switches ceiling roses and other electrical accessories,
in order to ensure good electrical contact between the wire or cable supplying the
curent, and the terminals of the cut-out or other article, it is customary, and
necessary to solder the two together, particularly in the larger sizes of such
articles As hither to made the terminals of cut-outs, switches, ceiling loses, and
the like have been so attached to the insulating base as to require several paits to
be loosened before the wires could be soldered into them, thus causing delay,
danger of small parts being mislaid, and the possibility of the various parts not
being firmly secured together again whereby heating of the connections might
result.
In order to prevent the loss of tune and the other diawbacks mentioned, I employ
china or other insulating bases of the size and shape to suit the various purposes for
which they are intended, and provided with lots or grooves in which the terminals
easily slide into position, and in which they are held by a nut or washer hitting ovel
By this method no
the top of the slot or groove, or in niccess formed thereat
parts have to be entirely disconnected, but on loosening a nut, the whole terminal
It can then be
can be withdrawn intact ready for soldering onto the wire or cable
placed back in position and the nut being instantly tightened up the operation is
completed.
The
In the case of a cut-out, to avoid the use of double nuts, one to clamp the
terminal and one to lix the safety fuse, I employ a spring nut to hold the safety
fuse firmly and at the same time to hold the terminal securely in position
use of the spring out also prevents any loosening of the contacts of the safety fuse
whether from expansion and contraction or froin vibration and thus obviates any
danger of heating at the point of convection.
will now proceed to describe my invention with reference to the accompanying
drawing.
Fig. 1. is a plan of a double pole cut-out made according to my invention, and is
shown partly provided with terminals and safety fuse
Fig 2 is a side elevation and section of the same cut-out and is also shown with
a terminal in one part
Fig. 3. 18 an end elevation of the same cut-out and is also shown with a terminal
in one part.
Fig 4 is an end elevation of a terminal or socket as used on the cut-out shown
by Figs. 1 to 3
Fig 5 is a side elevation and section of the same terminal showing concealed
spring inside the nut.
Fig. 6. 18 a perspective view of spring as used in nut of terminal illustrated by
Figs. 4 & 5.

page_text: The same letters of reference indicate the same parts in the several figures of the
drawing.
A is the china or other insulating base or mounting block.
B represents the slot or groove in which the terminal is placed.
Crepresents the recess above the slot B into which the washer F'hts and keeps
The recesses are made oval instead of round in order to
the terminal in position
allow for unequal contraction in the insulating base if made in china
D is a cable socket or terminal into which the electric wire or cable 1s
soldered.
E is the hollow nut to tighten down the washers and fuse and thereby keep the
terminal in position according to the length of fuse.
Fis the washer giving a laige contact surface 'to the fuse.
G is the fuse
18 the spring concealed in the nut E to always keep a constant pressure on the
fuse and thereby prevent heating from loose connectious.
My said invention is applied to switches, cut-outs, ceiling roses and other like
electric fittings in which it is desirable to remove the terminal in order to make a
soldered joint and is not restricted solely to the electric cut-out which is drawn as
an example.
1
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declaro that I claim as my
invention of "Improvements in Electrical Cut-outs or Safety Fuses, 'Switches and
the like "
Fust The use of slots or grooves in china or other insulating bases of electric
switches, cut-outs, ceiling 10ses and the like. whereby the terminals can be readily
detached from the base
'Secondly. The use of a sping nut on hollow nut with a concealed spring to
overcome the effects of expansion & contraction or of vibration in electric switches,
cut-outs, ceiling roses and the like
Thudly. The combination of a slotted base and a nut either with or without a
spring as a method of attaching terminals to an insulating base for electric switches
cut-outs, ceiling roses and the like.
Dated the 9th day of May 1895
JOHN BENJAMIN VERITY