Improvements in Wall Sockets for Temporary Electric Connections.
Year: 1890

page_text: Date of Application, 19th July, 1890
Complete Specification Left, 20th Apr., 1891-Accepted, 11th July, 1891
PROVISIONAL SPECIFICATION.
Improvements in Wall Sockets for Temporary Electric Connections.
I, JOHN MACINTOSH MACKAY MUNRO, of 136 Bothwell Street, Glasgow, in
the County of Lanark, North Britain, Electrical Engineer, do hereby declare the
nature of this invention to be as follows:-
The wall socket consists of two parts the socket proper and the plug which fits
into it and to which is attached the conductors usually flexible which carry the
current to a portable lamp or for other use. The socket has a round orifice with
two slots in its sides so made that any capped glow lamp such as those now made by
the Edison Swan Coy. Ld. will fit into it and flexible contact springs (one for
the positive end of branch lead and the other for negative end) are so placed within
it that when such a glow lamp is pushed into the socket the lamp will incandesce
if the wires joined to the socket are connected with a suitable dynamo or battery
circuit. A side spring is set so as to fall into a notch (which must be made in the
brass caps of lamps) when the lamp is home and therefore making good contact.
There is no bayonet movement as in most lamp holders.
The working part of plug is made of similar size and construction as the caps of
glow lamps and has the two projecting pins same as those are usually fitted with,
only larger and stronger. Owing to the round shape there is no difficulty in
getting the plug entered which difficulty is the chief characteristic of contact plug
hitherto. Terminals are provided on the plug to which flexible wires can be
attached. An ornamental cover which forms a convenient handle screws on
By so constructing the plug it will fit into any lamp socket in the house which
will hold a capped lamp.
over these.
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BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.
COMPLETE SPECIFICATION.
Improvements in Wall Sockets for Temporary Electric Connections.
I, JOHN MACINTOSH MACKAY MUNRO, of 136 Bothwell Street, Glasgow, in
the County of Lanark, North Britain, 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 :-
The wall socket consists of two parts, the socket proper and the plug which fits
into it, and to which is attached the conductors, usually flexible, which carry the
current to a portable lamp, or for other use. The socket has a round orifice with two
slots in its sides so made that any capped glow lamp such as those now made by
the Edison Swan Company Limited will fit into it, and flexible contact springs (one
for the positive end of branch lead, and the other for negative end) are so placed
within it that when such a glow lamp is pushed into the socket the lamp will
incandesce if the wires joined to the socket are connected with a suitable dynamo
or battery circuit. A side spring is set so as to fall into a notch (which must be
made in the brass caps of lamps) when the lamp is home and therefore making
good contact. There is no bayonet movement as in most lamp holders.
The working part of plug is made of similar size and construction as the caps
of glow lamps, and has the two projecting pins same as those usually fitted, but only
Price6d1

page_text: larger and stronger. Owing to the round shape there is no difficulty in getting the
plug entered, which difficulty is the chief characteristic of contact plug hitherto.
Terminals are provided on the plug, to which flexible wires can be attached. An
ornamental cover which forms a convenient handle screws on over these.
By so constructing the plug it will fit into any lamp socket in the house which
will hold a capped lamp.
In order that my invention may be properly understood and readily carried into
effect I have hereunto appended two explanatory sheets of drawings, in the
several figures of which corresponding parts are marked with the same letters of
reference.
Figure 1 is a section.
Figure 2 is a horizontal section of the same.
Figure 3 is a section through the line A B, Figure 2.
Fi
Figure
Figure 5 is a horizontal section of the same.
4 is a section of a modification.
A is the socket; and B the plug which fits into it, and to which is attached
the conductors x, y, usually flexible, which carry the current to á portable lamp,
or for other use. On each side of the orifice in the socket there is a springy piece
of metal c c¹, having notches d, d, into which the two projecting pins e, e¹ in the
plug pass so as to retain the plug in its place and thus ensure direct contact.
C is the piston rod, which is preferably made of brass, to which there is secured the
insulating block D carrying the spring central clips f, . I, I, are the holes for
the supply wires. E is a safety fuse plug; and F a porcelain ridge which separates
the fuse from the clips ff. When the piston rod C is in the position shewn in
full lines Figures 1, the circuit is complete. The circuit enters at I passes from
the plate to the spring f, and metal piece G of the plug up to x, from thence
through the flexible wire to the lamp and back to y; then down a second wire
in the plug B to a second metal piece which rests on the spring f, and from
the plate through the fuse E to the terminal I', in the plate Z. When the piston
rod C is pushed to the dotted position Figure 1, the circuit is broken, as there is
no connection between the spring clips f, f, and the metallic piece of the plug G.
The socket is secured into the wall by means of the screws H, H¹.
In Figures 4 and 5 in place of the piston rod C and its connections, I fix
the spring clips f, j, to the sole plate of the socket, so that when the plug B is
pushed into the socket the metallic pieces G, G' come in contact with the clips f, f³,
and so completes the circuit. The springy piece of metal c c¹ described and shewn
with reference to Figure 1 is similar although not shewn in Figure 4. When
the plug is removed the orifice in the socket is closed over by means of a hinged
cover J.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed; I declare that what I
claim is :-
Wall sockets for temporary electric lights, substantially as described.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.