Improvements in Tools for Electric Linemen.
Year: 1891

page_text: Date of Application, 1st May, 1891
Comp ete Specification Left. 30th Jan., 1892-Accepted, 5th Mar., 1892
PROVISIONAL SPECIFICATION.
Improvements in Tools for Electric Linemen.
I, ARTHUR CUTHBERT, residing at No. 25 Rosemont Road, Acton in. the
County of Middlesex, London W., Gentleman, occupied in studying Electrical
Engineering, do hereby declare the nature of this invention to be as follows:-
Whereas the usual way of cutting the insulation from electrically insulated wires
with an ordinary knif is troublesome and endangers the nicking and subsequent
breaking of the wire so the object of this invention is to ease this opperation and to
do away with this danger by the devising of a practicle hand tool, or pair of tools,
for bearing and cleaning electrically insulated wire as a preparation for making
electrical joints and connection, or other purposes.
This invention consists of two essential parts which may be constructed as two
separate tools, or as one combination tool which may have other useful parts such as
as wire cutters, pliers, screwdriver etc. added there to.
In the accompanying sheet of drawings,
Fig. 1. shows a construction of my insulation cutter, here-in-after described, with
wire cutters, a, added ;
Fig. 2. is a plan of the lower half of, A, (Fig. 1.) and upper part of B;
Fig. 3. is the end elevation of A, Fig. 1;
Fig. 4. showes elevation of a form of combined insulation cutter with wire
cutters, a, pliers, b, and screwdriver, c, added.
The first part of this invention, A, (Figs. 1, 2, 3, and 4) consists of a V trough
shaped jaw, with a blade parallel to it mounted in such a manner upon an opposite
jaw or arm that it (the blade) will cut any circular object exactly in half, if placed
between the jaws, in descending to the bottom of the V, and if a peice of insulated
wire be drawn through, the blade (pressing upon it) will slit the insulation so that
it can be pulled off if not actually sticking too fast to the wire. This V shaped jaw
is preferably furnishe with, or may be replaced by, suitably arranged friction
rollers.
The second part of this invention, B, (Figs. 1, 2, and 4) consists of cross nippers
which close past each other, the cutting-edges being curved so as to forme the
corners into points for cutting the insulation round the wire without cutting or
nicking the wire; these curved edges being also adapted for scraping the wire and
for cutting and snipping the insulation in any way that may be found convenient.
The cross nippers are preferably not at right angles to the line of the handles but
are made at the most convenient angle for cutting the insulation at right angles to
the line of the wire. Simularly part A, is not parallel with the line of the handles
but is made at the most convenient angle for cutting the insulation parallel to the
line of the wire.
In Figs. 1, 2, and 4, are are to take a spring, not shown, to open the
is a stop to save the cutting edges. In Fig. 4, the pliers, b, serve as
tool;
and
the stop.
y
Dated this Thirtieth day of April 1891.
ARTHUR CUTHBERT.
COMPLETE SPECIFICATION.
Improvements in Tools for Electric Linemen.
I ARTHUR CUTHBERT of Rosebourne, Castle Hill, Maidenhead in the County
of Berkshire, Electrical Engineer do hereby declare the nature of this invention
[Price 8d.1

page_text: and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
This invention consists in a hand tool for slitting the insulating covering of
electrical wires and dressing the wire for forming connections, etc.
The improvement consists in the shape and form of the two cutting blades which
are intended to sever the insulation around the wire, and in the form of cutter and
wire guide for slitting the insulation longitudinally so that the part severed may be
removed from the wire.
In the drawings
Fig. 1 is a view of such hand tool open for use.
Fig. 2 is a side view thereof.
Fig. 3 is an end view of the one end of the tool closed.
Fig. 4 is an end view of the other end of the tool closed.
A. A are the two malleable iron handles to which the steel blades B B are
fastened by screws. C is the pivotal screw or bolt and nut. D the spring tending
to open the tool. E the connector for keeping the tool closed when not in use.
According to this invention the blades B B' are made with the two dull
points bbbbat the extremities of their cutting edges these points being sharpened
along their inner edges but not along their outer edges, between the points b b
and b¹ b. are sharpened edges c c¹ which may be straight or curved. The insulating
cover around the wire is cut on the side of the wire nearest the operator by the
outer points of the tool and on the side furthest from the operator by the inner
points of the tool. The wire itself lies to the outside of the outer points or to the
inside of the inner points and is therefore uninjured by complete closure of the
tool.
39
Having severed the length of insulating cover to be removed from the remainder
as described or before doing so, this length is slit from end to end from the periphery
to the surface of the wire by drawing the wire between the slot or recess d in one
of the handles A and the knife e on the other. The knife rocks in a socket in the
rotary pin e and its lateral movement allows for working on wire that may not be
quite straight. A "V guard on the end of the knife gives the wire a central
guiding towards the knife, the same effect being arrived at by shaping the recess d
as shown. The lugs el limit lateral play of the knife e. The knife is preferably
made with rounded saw like teeth sharp all round. This form of slitter needs no
adjustment being automatically suited to centrally slit wire of any size from the
outside cover to the core with one cut.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is
1. A tool for severing the covering of covered wire having the pair of cutting
blades B B with projections bbb16 with dull points, sharpened on the inside, and
cutting edges ce' between said projections as set forth.
2. A tool for slitting the covering of covered wire with one slit lengthwise of said
wire, having a slot d on one arm and a knife e on the other arm movable in the
central axis of said slot d and adapted to slit a covered wire drawn through said
slot d.
3. A tool for slitting the covering of covered wire having a wire receiving slot d
and a rocking and rotative knife e with guide e thereon adapted to slit centrally a
curved wire drawn through said slot d.
Dated this 30th day of January 1892
HERBJRT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.