An Improved Form of Telephone Plug whereby the Strain is Taken Entirely off the Metallic Connection.
Year: 1890

page_text: Date of Application, 18th June, 1890
Complete Specification Left, 18th Apr., 1891-Accepted, 23rd May, 1891
PROVISIONAL SPECIFICATION.
An Improved Form of Telephone Plug whereby the Strain is Taken
Entirely off the Metallic Connection.
CHARLES PATRICK JOSEPH FITZSIMON No. 5 Ellis's Quay Dublin Clerk,
do hereby declare the nature of this invention to be as follows:-
A cylinder of metal or other suitable substance covered with insulating material
and terminating at one end with a cover in which is a hole for the cord or other
connection to pass through. The inside of the other end has a thread to which any
form of plug may be screwed and there is at this end a small hole through the
insulating material in which a binding screw is fixed that secures the plug to the
cylinder and prevents its turning round.
Doted the 10 of
.... 1800
C. P. J. FITZSIMON.
COMPLETE SPECIFICATION.
An Improved Form of Telephone Plu whereby the Strain is Taken
Entirely off the Metallic Connection.
1, CHARLES PATRICK JOSEPH FITZSIMOX, No. 5 Ellis's Quay, Dublin,
Clerk, 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 :-
This invention has reference to an improved form of telephone plug, whereby the
strain of the circuit wire is entirely taken off the metallic connection, and also its
tendency to twist or turn, effectually obviated.
In carrying out my invention I construct a cylinder of metal or other suitable
substance, covered or encased with an insulating material, and provided at one end
with a cover or cap pierced by an aperture, through which passes the cord, or other
connection.
On the internal surface of the other end of the cylinder is formed a screw
thread, into which may be screwed any form, or construction of plug, or connecting
rod.
The insulating case round the cylinder may be fixed, or simply slipped on, so as
to turn freely round same.
At the open end of the cylinder, a side screw is inserted through the insulating
case, which penetrates the thickness of the cylinder, and entering the base of the
plug, or connecting rod, prevents same turning when screwed home; or a transverse
pin may be inserted through the cylinder and plug, and its ends covered by the
insulating case.
To a binding screw in the base of the plug, or connecting rod the circuit wire, or
cord is attached, having been first provided with a knot in the ordinary manner to
take the strain or pull off the binding screw, and for the purpose of obviating its
tendency to twist or turn, a longitudinal slit is formed at opposite extremities of a
diameter in the cylinder, in which slides a transverse pin, which is caused to pass
through the section of the circuit wire, or cord, or through a loop or knot formed
on same.
In order that my said invention may be more readily understood, I will describe
the accompanying drawings, in which
Fig. 1 represents a view of my improved telephone plug complete, with the
circuit wire, or cord attached.

page_text: Fig. 2, is a similar view with the insulating case removed.
a, is the cylinder provided with a cap b, at its lower end, through which the
circuit wire, or cord passes; c, is the plug, or connecting rod, screwed on at the
top, which may be of any form most convenient in practice as already mentioned;
d, is the insulating case; e, is the transverse screw hereinbefore referred to, for
securing the parts and preventing rotation; y, is the transverse pin sliding in longi-
tudinal slits formed in the cylinder, which passes through the circuit wire, or cord
and prevents same turning, or twisting, while at the same time it helps to take the
strain off the binding screw.
Where a double circuit wire, or cord is used a second binding screw may be
provided in the cylinder as shown at h, to which the second end of the circuit wire,
or cord is attached.
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.
First. In apparatus used for telephonic purposes, the method whereby the strain
of the circuit cord is taken off the metallic connection, and the twisting or turning
of the circuit cord prevented, in the manner substantially, as herein specified and
set forth.
Second. In apparatus used for telephonic purposes, the combination formed by
the cylinder a, the insulating case d, the plug or connecting rod c, the transverse
screw e, and also the sliding transverse pin g, all substantially in the manner herein
described and set forth.
Dated this 16th day of Auril 1891
J. K. FAHIE & SON,
9, Westland Row, Dublin, Agents for Applicant.