Note: Descriptions are shown in the official language in which they were submitted.
ELECTROMAGNETIC WAVE INTERFERENCE PREVENTION
DEVICE FOR MULTIELECTRODE CONNECTOR
BACKGROUND OF THE INVENTION
Field of the Invention:
This invention rslates to improvements in an
electromagnetic wave interference prevention device for a
multielectrode connector, which prevents leakage of
electromagnetic waves from the periphery of a plurality of
cord lines connected to respective contacts held in a
connector body.
BRIEF DESCRIPTION OF THE DRAWINGS
The object and feature of the invention will become
apparent from the following description of a preferred
embodiment of the invention with reference to the accompanying
drawings, in which:
Fig. 1 is an axial sectional view showing a prior art
multielectrode connector;
Fig. 2 is a perspective view showing a multielectrode
connector in the course of assembly according to the present
invention;
Fig. 3 is a perspective view for explaining a state in
which a cord clamp of the multielectrode connector is secured
to a cord;
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Fig. 4 is a perspective view showing a modification of
the cord clamp used for the multielectrode connector;
Fig. 5 is a perspective view showing a modification of
means for securing the multielectrode connector to the cord;
Fig. 6 is a perspective view showing a state in which
the cord clamp of the multielectrode connector is assembled
to an outer sleeve;
Fig. 7 is a bottom view of the outer sleeve of the
multielectrode connector;
Fig. 8 is a top view showing the outer sleeve of the
multielectrode connector;
Fig. 9 is an axial sectional view showing the outer
sleeve of the multielectrode connector;
Fig. 10 is a side view, partly broken away, showing the
multielectrode connector in the assembled state; and
Fig. 11 is a side view, partly broken away, showing a
modificàtion of the multielectrode connector.
Description of the Prior Art:
Fig. 1 shows a multielectrode connector A. As is shown,
in an outer sleeve 1 consisting of a cylindrical metal member
a molding 3 of a synthekic resin member holding a plurality
of contacts 2 is fitted like a plug. Core wires 42a of a
plurality of cord lines 42 wrapped in an outer cover 40 and
shield wires 41 of a cord 4 are connected to the rear ends
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(right ends in Fig. 1) of the contacts 2 held in the molding
3. A cover 5 consisting of a synthetic resin member is fitted
on a range from a rear half of the outer sleeve 1 to a front
end portion of the outer cover 40 of the cord 4. When
connecting the individual cord lines 42 of the cord 4 to the
rear ends of the contacts 2 held in the molding 3, the cord
lines 42 are exposed by stripping the shield wires 41.
Therefore, the shield is insufficient in the neighborhood of
the connection region, leading to electromagnetic wave
interference.
There are various means for preventing the
electromagnetic wave interference. In either case,
complication of the fabrication is increased. In addition,
the components are increased to increase the assembly steps
and also increase the size of the overall multielectrode
connector.
SUMMARY OF THE INVENTION
An object of the present invention has been intended in
order to overcome the a~ove problems, and its object is to
provide novel means, which can reliably prevent the
electromagnetic wave interference without increasing the
number of components.
According to the present invention, there is provided,
in a multielectrode connector comprising a cylindrical outer
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sleeve made of a metal member, a molding fitted in the outer
sleeve and consisting of a synthetic resin material in the
form of a plug and a plurality of contacts held in the
molding, core wires of a plurality of cord lines of a cord
covered by an outer cover and shield wires, an electromagnetic
wave interference prevention device comprises a cord clamp
consisting of a metal member in the form of a lid closing a
rear open end of the outer sleeve, the cord clamp being fitted
on the outer periphery of an end portion of the outer cover
of the cord and integrally coupled to the cord, the cord clamp
being integrally assembled to a rear end of the outer sleeve
such as to close the rear open end of the outer sleeve.
DETAIL~D DESCRIPTION OF THE PREFERRED EMBODIMENT
In the Figures, components having the same effects as
those in the prior art means described above are designated
by like reference numerals.
Fig. 2 is a perspective view showing a multielectrode
connector ~ being assembled for carrying out the present
invention. Reference numeral 1 designates an outer sleeve
serving as outer electrode and consisting of a cylindrical
metal plate, 3 a molding of a synthetic resin material fitted
like a plug in the outer sleeve 1, 2 contacts inserted through
and held in respective through holes 30 formed in the molding
3, 4 a cord having cord lines 42 connected to connection
terminals of the contacts 2 on the rear end side (right
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end side in Fig. 2) thereof, 5 a cord clamp having a
lid-like form for closing a rear open end 10 of the
outer sleeve 1.
The outer sleeve 1 is formed by processing a
: 5 steel plate stampted to a predetermined shape and havinga spring character with a press into a cylindrical
shape. Axial but faces 11 of the stamped steel plate,
which are abutted when the steel plate is formed into
the cylindrical shape, are respectively provided with a
wedge-like engagement projection 12 and a notch 13
having a complementary shape. The inner periphery of
the sleeve 1 near the front end is provided with
stoppers 14 in the form of short ribs (Fig. 8) for
restricting the position of the molding 3 fitted in the
sleeve 1. The bottom portion of the sleeve 1 opposite
to the butt faces 11 is provided with a guide rib ].5
serving as a guide when inserting the molding 3 and also
with a stopper pawl 16 for restricting the return of the
fitted molding 3 (Figs. 7 and 9).
Engagement pawl pieces w extend from the rear end
of the outer sleeve l. They are formed integrally with
the steel plate when stamping the steel plate material.
As shown in Figs~ 7 and 8, they extend rearwardly from
the rear end la of the outer sleeve 1. As shown in
Figs. 7 and 8, the engagement pawl pieces w are provided
at positions dividing the circumference of the rear end
of the outer sleeve 1 into four uniform sections. Of
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these engagement pawl pieces w, adjacent two are
provided on the opposite sides of the butt faces 11
(Fig. 8).
The molding 3 has axial through holes 30
(extending to the left and right in Fig. 10), in which
the contacts 2 are inserted and held. The front end
(left end in FigO 1) of the outer periphery of the
sleeve 1 are provided with recesses 31, in which the
stoppers 14 are engaged. The outer periphery of the
molding 3 is also formed with an axial guide groove 32
open at the opposite ends, in which the guide rib 15
noted is engaged.
The cord clamp 5 is a metal member in the form of
a flange having radial projections as shown in Fig. 2.
It is formed at one axial end of a cylindrical member 50
which is slidably fitted,on the outer periphery of an
outer cover 40 of the cord 4. The cylindrical member 50
is fitted on and moved along the cord 4 up to a
predetermined position, at which shield wires 41 having
been folded up are covered. In this state, the
cylindrical member 50 is crushed with a suitable tool so
that it is pressed on and integrally coupled to the
outer periphery of the outer cover 40 of the cord 4, as
shown in Fig. 3. Fig. 4 shows a modification of the
cord clamp 5. This cord clamp 5 is a C-shaped metal
member having a gap portion 5a. It is fitted from the
gap portion 5a on the outer periphery of the outer cover
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40 of the cord 4, and then the gap portion Sa is closed.
In consequently, the inner periphery of a central
portion 5b wedges on the outer periphery of the outer
cover 40 of the cord 4, whereby the cord clamp is
tightly integrally coupled to the cord 4.
Further, the cord clamp 5 with the cylindrical
member 50 may be tightly fitted on the outer periphery
of the outer cover 40 of the cord 4 with the cylindrical
member 50 on the front side, as shown in Fig. 5.
The cord clamp 5 is formed to have a shape and a
size such that it serves as a lid to close the rear open
end 10 of the outer sleeve 1 when it is joined to the
rear end la oE the outer sleeve 1 by moving it together
with the cord 4 toward the outer sleeve 1 by inserting
the molding 3 holding the contacts 2 having been
connected to the cord lines 42 into the outer sleeve
when it is secured to the outer periphery of the outer
cover 40 of the cord 4. As shown in Figs. 2 and 3, the
outer periphery of the cord clamp 5 has radially spaced-
apart outer projections y provided at positionsuniformly dividing the circumference of the cord clamp 5
into four sections. Each of the outer projections y has
a width to be closely engaged in the gap between
adjacent engagement pawl pieces w provided at the rear
end of the outer sleeve 1 and has a height such that the
projecting end overlaps at least the rear end la of the
outer sleeve 1 with the cord clamp 5 joined to the rear
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end of the outer sleeve 1 as shown in Fig. 6. The outer
projections y provided on the outer periphery of the
cord clamp 5 are fitted in gaps between adjacent
engagement pawl pieces w of the outer sleeve 1 so that
the cord clamp 5 is not rotated in the circumferential
direction relative to the outer sleeve 1. The number of
the outer projections y corresponds to the number of
engagement pawl pieces w formed on the rear end of the
outer sleeve 1.
When the cord clamp 5 is as shown in Fig. 4,
having the gap portion 5a, the molding 3 holding the
contacts 2 connected to the core wires 42à of the cord
lines 42 of the cord 4 is inserted into the outer sleeve
1 with the cord clamp 5 tightly fitted on the outer
periphery of the outer cover 40 of the cord 4, the cord
clarnp 5 is joined to the rear end of the outer sleeve l,
and the outer projections y are fitted in the gaps
between adjacent engagement pawl pieces w such that the
position of the gap portion 5a of the cord clamp 5 is
shifted in phase in the circumferential direction with
respect to the butt faces 11 of the outer sleeve 1.
The cord clamp 5 joined to the rear end of the
outer sleeve 1 is integrally assembled on the outer
sleeve 1 by caulking each engagement pawl piece w of the
outer sleeve 1 to the outer side (rear side) of the cord
clamp 5 as shown in Fig. 6.
In the illustrated embodiment of the device,
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reference numeral 7 designates a synthetic resin cover
molded on a region from the outer periphery of the rear
half of the outer sleeve 1 to the outer periphery of an
end portion of the cord 4, and 17 a positioning notch
serving as a positioner when inserting the front end of
the outer sleeve 1 into the corresponding part of the
multielectrode connector.
The embodiment of the device having the above
construction has the following function.
The cord clamp 5 which is secured to the rear end
of the outer sleeve 1 consists of a metal member and
close wires the rear open end lO of the outer sleeve 1.
Thus, the cord lines 42 taken out from the shield wires
41 of the cord 4 and connected to the rear ends of the
contacts 2 and connection regions between the core wires
42a of the cord lines 42 and the contacts 2 are confined
in and in cooperation with the outer sleeve 1, as shown
in Figs. 10 and 11, so that it is possible to reliably
prevent the leakage and intrusion of electromagnetic
waves.
The cord clamp 5 having the inner wall of its
central hole portion 5b is integrally fitted on the
outer periphery of the outer cover 40 of the cord 4.
~lso, it is integrally coupled to the rear end of the
outer sleeve 1 serving as a body of the connector body a
of the multielectrode connector A. Thus, it is possible
to reliably prevent the cord 4 to be withdrawn relative
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to the connector body a when the stem end side of the
cord 4 ls strongly pulled with the multielectrode
connector A coupled to the opposi-te side connector.
As has been described in the foregoing, with the
electromagnetic wave interference prevention device in
the multielectrode connector according to the present
invention, the cord clamp 5 provided to retaining the
cord 4 against detachment is made of a metal member and
assembled to the rear end of the outer sleeve 1 like a
lid closing the rear open end 10 of the outer sleeve 1,
whereby the plurality of contacts 2 held in the molding
3 and connection regions between the shield lines 41 of
the cord 4 and a plurality of cord lines 42 taken out
from the shield wires 41 of the cord 4 are perfectly
covered by the metal member in cooperation with the cord
clamp 5 and outer sleeve 1. Thus, it is possible to
retain the cord 4 against detachment and reliably
prevent electromagnetic wave lnterference by merely
assembling the cord clamp 5 for retaining the cord 4 and
without use of any particular part for electromagnetic
wave interference prevention or increasing the number of
assembly steps.
