Improvements relating to Plug Switches and Plug Connections for the Control and Distribution of Electric Currents.
Year: 1898

page_text: Date of Application, 23rd Mar., 1898
Complete Specification Left, 8th Sept., 1898-Accepted, 26th Nov., 1898
Date of Application, 23rd Mar., 1098
Complete Specification Left, 8th Sept., 1898-Accepted, 26th Nov., 1898
Improvements relating to Plug Switches and Plug Connections for
the Control and Distribution of Electric Currents.
HAROLD FARADAY PROCTOR, of No. 13, Burlington Road, Redland, Bristol,
A.M. Inst. C.E., Electrical Engineer, and JOHN RUTHERFORD BLAIKIE, of No. 13,
Burlington Road, Redland, Bristol, A.M. Inst. E.E., Electrical Engineer, do
hereby declare the nature of this invention to be as follows:―
Our improvements consist in having a specially constructed spiral spring or
springs to be enclosed within a tube, gland, or guides through which the plug
passes, thereby ensuring better electrical connection between the plug and the
tube, gland or guides or other electrical contact, together with greater facilities
for renewing the wearing portions of the connections.
The spring above mentioned may be formed by winding a wire of round, square,
or other section upon a mandril, having an elliptical or other shaped section.
The spring so formed is then bent so that its longitudinal axis forms a circle
and is placed into the tube gland or guides.
The action of pushing the plug into the aperture thus formed by parts of each
convolution of the wire, will create a pressure between the plug and the spring,
and the spring and the tube gland, or guides, and will form the improved
electrical connection, which will allow of a great amount of wear, and may be
renewed by the replacing of a spring.
Dated this 22nd day of March 1898.
H. FARADAY PROCTOR,
J. RUTHERFORD BLAIKIE.
Improvements relating to Plug Switches and Plug Connections for
the Control and Distribution of Electric Currents.
HAROLD FARADAY PROCTOR, Electrical Engineer, 13, Burlington Road, Redland,
Bristol, and JOHN RUTHERFORD BLAIKIE, Electrical Engineer, 13, Burlington
Road, Redland, Bristol, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
Our improvements consist of having a specially constructed spiral spring or
springs marked A on the drawing to be enclosed in a tube, gland, or guides
marked B on the drawing through which the plug marked C on the drawing
Dino R77

page_text: passes, thereby insuring better electrical connection between the plug C and the
tube gland or guides B or other electrical contact, together with greater
facilities for renewing the wearing portion of the connection.
The spring A above mentioned may be formed by winding a wire of round,
square, or any other section, upon a mandril, the mandril having an elliptical
or other shaped section.
The spring so formed is then bent so that its longitudinal axis forms a circle
and is placed into a tube gland or guides.
The action of pushing the plug into the aperture thus formed by parts of each
convolution of the wire, will create a pressure between the plug and the springs,
and the springs, and the tube, gland or guides, and will form the improved
electrical connection, which will allow of a great amount of wear and may be
renewed by the replacing of a spring. The covers marked D on the drawing of
the gland or guides, may be screwed to the same and the wear in the spiral springs
can be taken up by screwing up one of these end covers.
A substitute for a spiral spring, may be constructed by bending a metal ribbon,
or stamping of sheet metal on itself in alternate directions, so as to form an
accordion fold." A short length of the ribbon or stamping thus folded being
then bent into the form of a cylinder having the folds parallel to the axis and be
placed inside the tube gland or guides before mentioned in substantially the same
manner and for the same purpose as the spiral spring.
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:
1st. A plug switch or electrical connection substantially as described.
2nd. The use of a spiral spring in the manner specified for the purpose of
electrical contacts.
3rd. The use of a bent metal ribbon or stamping of sheet metal in the manner
specified and for the purpose of electrical contacts.
Dated this 7th day of September 1898.
H. FARADAY PROCTOR.
J. RUTHERFORD BLAIKIE.