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Патент USA US2403443

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July 9, 1946. _
I
' È. 1:).r KNAB '
2,403,443
ÍMPALING INSTRUMENT
Filed Jan. 13, 1945
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5.0. KNAB
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Patented July 9, 1946
2,403,443
UNITED STATES PATENT OFFICE
2,403,443
IMPALING INSTRUMENT
Emil D. Knab, Lake Parsipany, N. J., assignor
to Bell Telephone Laboratories, Incorporated,
New York, N. Y., a corporation of New York
Application January 13, 1945, Serial No. 572,692
1 Claim.
1
This invention relates to a punching and per
forating tool for mounting a succession of washers
upon the central wire of a coaxial cable.
An object of the invention is to simultaneously
(Cl. 164-86)
2
ceive the upper end of the wire Il upon which the
washers are to be placed.
Let us now suppose that the operation of per
Another object of the invention is to provide
forating and impaling washers is to be performed.
The handle I6 of the tool is depressed enough so
that the cam surface 6 slightly separates the
blocks 8 by pushing upon extensions II thereof
and a short straight length of wire is thrust up
means for and a method of more expeditiously
ward through the barrel I2 and into an opening
cut and impale upon a Wire a series of washers
made from polythene sheet stock or similar ma
terial.
constructing coaxial conductors.
10 i3 in the plunger 5. The wire Il is adjusted so
The nature of an embodiment of the invention
that it is centered at the bottom end in a small `
is set forth in detail in connection with the ac
groove I4 and clamped into place by a small
clamping screw I8. The barrel I2 is of a diame
Fig. 1 is a side View of an exemplary embodi
ter exactly equal to the outer diameter of the
ment of the invention;
15 washers. The handle I `li is now raised which lifts
Fig. 2 is an end view thereof as viewed from
the smaller plunger 5 upward away from the
the left with parts in section;
blocks 8 and the withdrawal of the larger plunger
Fig. 3 is a top view showing a strip of sheet
4 allows the springs to press the -two blocks 8 to
stock in the tool, from one end of which washers
gether upon the end of the wire which is centered
have been cut;
,
in the opening defined in the two grooves of the
Fig. 4 is a, section on the line 4_4 of Fig. l, look
abutting surfaces of the blocks. It is desirable
ing downward;
that the upper end of the wire be adjusted to lie
Fig. 5 is a section on the line 5-5 of Fig. 1; and
a Very small amount above the upper surfaces of
Fig. 6 is a view of a short coaxial line with
the blocks 8. The strip of polythene is now in
washers hunched upon a piece of a central con 25 serted and the handle depressed. The small
ductor which extends from the outer conductor.
plunger forces the wire through the strip, the end
In its exemplary embodiment, the invention
of the wire passing up into the bore I9 of the
comprises a hand-operated tool for simultaneous
plunger 5, and at the same time the plunger cuts
ly impaling washers and placing them upon the
the washer out of the strip with an outer diameter
central wire of a coaxial cable.
.
30 of a size which just lits the bore I2. I‘he entrance
A group of washers mounted upon the central
of the wire into the central hole of the washer is
wire of a coaxial conductor before they have been
effected by lateral displacement of the material
inserted in the outer circular conductor is indi
hence no chad or circular cuttings are taken out
cated at I located in the positions in which they
of the hole into which the wire ñts nor does the
companying drawing in which:
are applied to the wire by the tool; after applica 35 tool require any means for disposing of such
tion, the Washers are distributed along the wire
chads. The handle and plungers are then re
and thrust into the cylindrical outer conductor 2
tracted, the strip moved along and the operation
along with the wire and serve to insulate the cen
repeated over and over again until the bore I2 is
tral wire therefrom. It is found in practice that
approximately ñlled with washers; in the embodi
the washers are impaled upon the wire rather 40 ment illustrated, it holds about forty to sixty
tightly as a result of which considerable friction
washers. Although shown as hand-operated, it
is offered along the movement of the central wire
is quite within the scope of the invention to em
and after being distributed they remain in place
body the operative elements of the device in
within the outer cylindrical conductor 2 as they
power operated mechanism.
45
are distributed before being inserted therein.
What is claimed is:
.
The tool for impaling the washers consists of
Washer making, impaling and mounting
a base block 3 having perforations therethrough
means comprising a set of normally adjacent but
for two plungers 4 and 5. The plunger 5 performs
separable die blocks, means for mounting an elon
the cutting and impaling of the washers whereas
gated member with an end between the blocks,
the plunger 4 comprises a guide and also has a 50 and a sheet of washer strip upon the die blocks, a
camming surface 6 to separate two anvil blocks
hollow member for cutting, perforating, and im
8 which will be hereinafter referred to. The
paling each washer upon a single stroke, means
plungers are rigidly connected to a block 9 and
simultaneously operable to advance the hollow
the length of the plunger 4 is adjustable so that
member against the blocks for cutting the Washer,
the camming surface `[i will be effective at the
and means advancing with the hollow member to
proper instant. A narrow flat strip of polythene
separate the die blocks whereby a washer is cut
is inserted in a diagonal guideway I0 which passes
from the sheet, perforated and impaled upon the
over the blocks 8. 'I'he blocks 8 are pushed to
elongated member and advanced therealong in
gether by springs and at their adjoining surfaces
a single operation.
have small grooves which define an opening to re 60
EMIL D. KNAB.
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