Year: 1899

page_text: wires.
In the accompanying drawing
Figure 1 is a side elevation of the tool.
Figure 2 is a longitudinal section on the line 2-2 Figure 3 and
Figure 3 is a vertical cross-section through the jaws of the tool.
Figures 4 and 5 are two knives employed in the tool.
Figure 6 is a longitudinal section of the insulating tube, to be cut through and
Figure 7 is the similar longitudinal section of the tube, after being cut through
by the tool.
In the drawings like letters denote like parts; 1 and 2 being handles of the
tongs, which are united by the pivot joint 3.
In carrying the invention into effect as illustrated in the accompanying drawing
two semi-circularly shaped knives 8 and 9 are secured within one or both the jaws 4
and 5, and are adapted to cut through the composite tube 6, 7 (Figure 6). This
tube is provided of an inner tube 6, especially intended to insulate the con-
ducting wire, and an outer tube or cover 7 mainly intended for protecting the
tube G, and the radius and of the knives 8 and 9 are of different and corres-
ponding length, as is clearly shown in Figures 4 and 5. The knives 8 and 9
may be secured in position by screws 10 and clamp plates 11. The knife 9, has
its radius corresponding to the radius s¹ of the tube 7, whilst the radius of the
knife 8 corresponds with the radius of the inner tube 6. There is however no
necessity for the knives and 9 to correspond perfectly in the radius and shape of
their edges with the radius and shape of the respective tubes that is to say, with
the outer and inner diameter of the inner tube 6; but the best results are obtained
if the knives exactly correspond.
In order to cut through the insulating tube 6 and its protecting cover 7 in such
a manner that the tube 6 after being cut, projects a distance out of its cover 7,
the knives 8 and 9 are arranged at a distance apart, corresponding to the desired
length 12 (Figure 7) of the projection, Figure 3 shows clearly this arrangement
of the knives 9 and 10.
In using the tongs or cutting tools, the handles 1 and 2 are gripped and the
interposed spring 13 thereby compressed and the mouth of the tongs or cutting
tool opened, so as to enable the latter to receive the tube 6, 7 (Figure 6). Then the
handles 1 and 2 are released and the jaws 4 and 5 embrace the tube 6, 7, under the
pressure of the spring 13. As soon as the tube 6, 7 is now turned the knife 8,
(Figures 3 and 4), at first cuts through the cover 7, then under the permanent

page_text: action of the spring 13, both the knives 8 and 9 simultaneously cut into the tube 6
and its cover 7, until the knife 9 touches the outer surface of the tube 6 and the
knife S has completely cut through it. The cut part then drops away.
The tongs or cutting tool, shown in the drawings is fitted with only two knives
8 and 9 within the same jaw, whilst the other jaw contains two rollers 15, adapted
to facilitate the turning of the tube. These rollers 15 may however be dispensed
with and replaced by knives, such as those illustrated in Figures 4 and 5 and
arranged immediately opposite them.
Any number of knives may be employed as may be required and at any distance
apart.
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
1. An instrument or tool for cutting through insulating tubes, and for similar
employment, consisting of knives such as 8 and 9 rigidly secured parallel to and
in a determined distance from one another, the one of which may be adapted to cut
through an inner or insulating tube, whilst the other cuts its outer or protecting
cover, such tool being preferentially either provided with rollers in the lower jaw
or with corresponding supplementary knives for the purpose and substantially as
described.
2. An instrument or tool constructed substantially as and for the purposes
hereinbefore described and illustrated.
Dated this 2nd day of November 1899.
EDWARD EVANS & Co..
27, Chancery Lane, London, W.C., Agents for the Applicant.