Improvements in Tools for Stripping Insulation from Wires.
Year: 1896

page_text: Date of Application, 1st May, 1896-Accepted, 20th June, 1896
COMPLETE SPECIFICATION.
Improvements in Tools for Stripping Insulation from Wires.
I WILLIAM MCMURTRIE, Machinist of Proctorknott Post Office, Proctorknott
Minn. U.S.A. 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 improvements in tools for stripping insulation from wires,
and the object of the invention is to provide a very cheap, simple and strong tool,
by means of which the insulating material on a wire may be conveniently stripped
either from the ends of the wire, or from any desired part thereof, and also to
produce a tool which is adapted to split the insulation longitudinally to facilitate
its easy removal, and is also adapted to cut the insulation transversely, so as to
determine the length of the wire to be stripped.
To these ends, my invention consists of a wire stripping tool, the construction
of which will be hereinafter described and claimed.
Reference is to be had to the accompanying drawings forming part of this
Specification, in which similar figures of reference indicate corresponding parts in
all the views.
Fig. 1 is a perspective view of my improved tool, illustrating the operation of
stripping a wire.
Fig. 2 is an end elevation of the tool, showing in cross section a wire held
between the bearing wheel and the cutting disc of the tool.
Fig. 3 is a side elevation; and
Fig. 4 is a plan view thereof.
The tool comprises handles A and A', pivoted together as at B, and terminating
in short jaws a, and a'. On a spindle or stud C, extended laterally from the
jaws a, is mounted to rotate a peripherally grooved bearing wheel D, and on a
stud or spindle C¹, extended laterally from the opposite jaw is mounted to
rotate a disc E, having a cutting edge e, adapted to enter the groove of the
bearing wheel.
By mounting the bearing wheel D, and cutting disc E, to project beyond
the side plane of the jaws and also beyond the adjacent side plane of the handles,
it is obvious that the tool may be drawn longitudinally along any desired
length of wire as 1, illustrated in Fig. 1 of the drawings, to cut through the
insulation which would not be possible were the parts D, and E, mounted to rotate
between the said jaws.
On the sides of the jaws a and a', opposite the bearing wheel and cutter
disc, blades F, are secured and are designed for use in cutting insulation
transversely or around a wire at a point from which it is desired to strip the
insulation.
In use, the bearing wheel and cutter disc are placed in engagement with the
insulated wire 1, shown in Figs. 1 and 2, and then by pressing the handles together
the cutter will be forced through the insulation and upon drawing the tool length-
wise of the wire, or the wire lengthwise through the tool, the insulation will be
severed and may be readily pulled off, thus adapting the wire for many purposes,
such as making contact, splicing, etc.
I do not confine myself to the specific details of mere mechanical construction
as herein shown and described, as it is obvious that under the scope of my invention
I am entitled to make slight changes of detail.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
-claim is
1. A wire stripping tool, comprising handles pivoted together and terminating
in jaws, a peripherally grooved bearing wheel mounted to rotate on the side of
one of the jaws and laterally of the adjacent side of the handles, and a cutter
disc mounted to rotate on the side of the other of said jaws and laterally of the
adjacent side of the handles, whereby the tool may be drawn lengthwise of a long
stretch of wire, substantially as specified.
2. A wire stripping tool, comprising pivoted handles terminating in jaws, a
grooved bearing wheel mounted to rotate on a stud or spindle extended laterally
from one of said jaws, a cutter disc mounted to rotate on a stud or spindle extended
laterally from the other of said jaws, and cutter blades secured to said jaws,
substantially as specified.
Dated this 1st day of May 1896.
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C., Agents.