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Патент USA US3032884

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May 8, i962
H. L. COHN ET AL
3,032,874
MARINE CABLE KNIFE
Filed Sept. 8, 1959
„Figi
INVENTORS
HA/zny L. (0H/v
/P/cfmka ift/_ CoH/V
BY
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ATTORNEY
United States Patent O
pr'
ICC
2
1
end of the cable 23.
3,032,874
3,032,874
Patented May 8, 1962
The remaining armor in the cut
portion is bent back and removed by complete scoring
MARINE CABLE KNIFE
around the cable at 21.
`instead of cutting towards a -free end, another com
Mass., and Richard W. Cohn, Newton Centre, Mass.
plete scoring around the cable may be used as a termina
5
(340 Commonwealth Ave., Newton 67, Mass.)
tion point for the armor strip to be removed.
Filed Sept. 8, 1959, Ser. No. 838,630
The end of the hook is rounded to prevent it from
3 Claims. (Cl. StL-91)
digging into the armor and to also protect the operator
in case of a slip of the knife. The blade is preferably
This invention relates to a knife blade for removing
Harry L. Cohn, 1119 Boylston St., Newton Highlands,
woven-metal covering from cable.
fabricated from high carbon, high chrome rust resistant
For many years, a practical tool has been sought to
remove the woven-metal sheath `from marine cable and
the like which are often as muchas four inches in diam
eter. Cutting tools that are used for cutting off insula
steel.
While the preferred embodiment of our invention has
been described in detail, it will be understood that we
do not wish to be limited to the particular construction
tion (eg. rubber, plastic, cloth, etc.) from ordinary wires
set forth, since various changes in the form, material,
proportions and arrangement of parts, and in the details
and land cables are unsatisfactory for such armored cable.
No hand cutting tool is known which can be made as to
be effective for such armored cable.
One object of this invention is to provide a novel knife
blade which can readily and easily remove a longitudinal 20
of construction may be resorted to without departing
from the spirit and scope of the invention, or destroying
any of the advantages contained in the same, heretofore
described and defined in the following claims.
We claim:
strip of the armor and thus permit the remainder to be
1. A stripping tool comprising an elongated blade body
readily pulled off.
equipped with a handle at its inner end and terminating
Further objects and a fuller understanding of the in
at its outer end in a U-shaped hook; said blade body hav
ven-tion will hereinafter appear from the following de
scription of a preferred embodiment illustrative of the 25 ing a longitudinal scoring edge on its stem extended by
a guiding longitudinal edge, a transverse cutting edge
invention and shown in the accompanying drawings in
and another guiding cutting longitudinal edge; said trans
which:
FIG. l is a side view of the blade inserted in a handle.
FIG. 2 is a top view of cable showing scoring.
verse edge and said longitudinal edges being positioned
on the inner portion of said U-hook; said longitudinal
FIG. 3 is a top view of cable showing a portion of a 30 edges being substantially parallel said transverse cutting
edge being a straight edge substantially perpendicular to
strip of armor removed.
FIG. 4 is a section taken on line 4~--4 of FIG. 3.
said guiding edges.
2. A stripping tool consisting of an elongated blade
body equipped with a handle at its inner end and termi
stem portion terminating in a U-shaped hook. A double 35 nating at its outer end in a `U-shaped hook; said blade
bevel scoring edge is provided along the inner side of the
body having a longitudinal scoring edge on its stem ex
stem. Within the U-hook there is a double bevel cutting
tended by a guiding longitudinal edge, a transverse cutguide edge which is an extension of the scoring edge.
ting edge and another »guiding cutting longitudinal edge;
Transverse to this edge is a sli-tting edge, the bevel sides
said transverse edge and said longitudinal edges being
of which preferably form an angle smaller than »the angle 40 positioned on the inner portion of said U-hook; said
The device consists of a stripping tool firmly attached
on its shank end to a handle. The blade has an elongated
between the bevel sides of the cutting lguide edge. EX
tending from the other end of the slitting edge is another
short cutting guide edge extending approximately to the
longitudinal edges being substantially parallel; all said
edges being beveled; the angle between the bevel sides of
the cutting edge of said transverse edge being smaller
than the angle between the bevel sides of the edge of said
Referring to the drawings, the device therein shown 45 longitudinal edges, said transverse cutting edge being a
end of the hook.
as illustrative of one embodiment of our invention com
stà‘aight edge substantially perpendicular to said guiding
prises a cutting tool for removing woven wire armor
from an insulated cable. It consists of a blade 1€)` having
a shank portion 11 to be firmly tixed in or clamped by a
e ges.
3. A cable knife blade having an elongated stem por
tion terminating in a U-shaped hook, comprising a shank
handle 12. The blade 10 has four double bevel edge 50 portion and a body portion; said body portion having a
portions. The edge of stem portion 13 is Iused for scor
longitudinal scoring edge, and a transverse cutting edge
ing and cutting the armor in order to start and then to
extended on either end by a substantially longitudinal
complete the cutting operation. Edge 14 with edges 15
guide cutting edge; said transverse and longitudinally
and 16 as guide cutters is operable to cut a strip of the
guide cutting edges being positioned on the inner edge of
armor 17 from cable 18 exposing the outer electrical 55 the U-hook, the end of said hook being rounded, said
insulation 19 surrounding the electrical conductors 20.
transverse cutting edge being a straight edge substantially
Edge 14 is a straight edge substantially perpendicular
to edges 15 and 16.
In operation, a transverse scoring and starting cut 21
is made by edge 13. With the blade 10 placed flat against 60
the cable and with edge 14 facing the operator and en
perpendicular to said -guiding edges.
References Cited in the tile of this patent
UNITED STATES PATENTS
21, the handle is pulled towards the operator. The edge
318,211
1,187,386
Seaman _____________ __ May 19, 1885
Pehrson _____________ __ June 13, 1916
14 with guide cut-ters 15 and 16 cut a strip of armor 22
away from the insulation 19 and all the way to the free 65
1,546,975
2,348,429
Feller _______________ __ July 21, 1925
Walker _______________ __ May 9, 1944
gaged with the portion of the armor slightly raised at cut
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