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Патент USA US3056861

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Oct. 2, 1962
w. J. sco'r'r
3,056,851
CONNECTOR
Filed Dec. 3, 1959
IN VEN TOR.
nit
tates
atent
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1
3,055,851
CONNECTOR
William J. Scott, Sycamore, ill, assignor to ideal indus
tries, Inc., Sycamore, llll., a corporation of Delaware
Filed Dec. 3, 1959, Ser. No. $57,099
it} Claims. (£3. l'7li-=~8‘i)
3,056,851
Patented Oct. 2, 1962
2
of the shell or cap to function as a shoulder or anchor
for the end of the coil. This abutment or shoulder may
be of a suitable formation but it is preferred that it op
pose the end of the coil to resist the normal rotative
tendency of the coil, when the connector is being turned
down over the stripped ends of a plurality of wires. The
abutment may be a separate metal insert, but I ?nd it
easier to mold it as an integral part. The end 34 of the
coil might be blunt, turned in or back, or otherwise suit
This invention is in the ?eld of connectors of the screw
on type and is ‘a new and improved insulating cap with
a connecting structure, constructed and arranged to be 10 ably shaped, to engage the abutment regardless of its
turned or screwed down over the stripped ends of a plu
particular size, shape or disposition.
rality of ‘electric wires, for example, two or more, either
The open end of the cap may be provided with an en
stranded and/ or solid, of the same or different sizes, or
larged, preferably integral skirt 40, which may ‘be cy
otherwise.
lindrical and well rounded, as at 42, where it joins the
A primary object of the invention is a new ‘and im 15 shell or cap to function as a guide or funnel and also as
proved electrical connector of the screw-on type.
a skirt to prevent arcing to a ground.
Another object is a connector having a cap of a stifily
The end wall of the cap at the closed end of the bore
?exible material constructed so that the stripped ends of
is offset, as at 44, and moves into a tapered socket or
the wires being connected will not pierce, penetrate or
damage the end of the cap.
Another object is a connector protected against the
stripped ends of the wires puncturing the end of the cap
but without complicating manufacture or assembly.
cavity 136 behind the abutment 38.
The depth of the
socket 46 or cavity may varysomewhat and I position a
steel or metal ball or sphere 48 in the form of an insert
next to or in the socket which, as shown, has an outside
diameter slightly greater than the inside diameter of the
throat 5d of the coil to prevent the ball orsphere from
for the stripped ends of the wires to prevent the cap from 25 coming out. As shown in FIGURE 3, the ball may ?t
being damaged or pierced.
loosely within the large or expanded turn ‘32 of the coil
Another object is a connector structure with a guide
Other objects will appear from time to time in the en
suing speci?cation and drawings in which:
FIGURE 1 is a plan view of the connector;
FIGURE 2 is an end view; and
FIGURE 3 is a section along line 3—3 of FIGURE 2.
In the drawings, the connector has been shown with an
insulating cap or cover which has been indicated gen
erally at it) ‘and may include a generally cylindrical body
which pilots or centers the coil in the rear end of the cap.
The socket has a tapered inner wall 52 which is closed
off by a rear wall 54 which has a diameter less than the
ball diameter 48. Since the socket is tapered, it enlarges
forwardly and the inside diameter of the socket at its
entrance, say at the beginning of o?set 44, is on the order
of and possibly slightly greater than the ball diameter.
Or it might be slightly less. But, in any event, the ma
or shell 12 closed at one end by an end wall 14, which
terial is su‘f?ciently distortable or ?exible so that when
is preferably integral with the cap and generally open at
the ball is pushed toward the socket, the sides will ?ex
the other end at 16, providing what shall be termed a
generally open central bore 18. The bore of the cap or
be forced in. The object of this is that when the stripped
out somewhat at the socket entrance, and the ball may
coil houses or encloses a wire coil 2t}. For purposes of
ends of the wires move through the throat 50 and con
illustration, the coil has been shown generally tapered
tact the ball, the pressure developed will force the ball
into the tapered socket where it will seat ?rmly. There
after, if the connector is backed off of the wires, the ball
will stay in the socket.
This has the advantage that a connector of this type
in use expands the throat 50 of thecoil. The throat may
with a large end 22, adjacent the open end of the cap and
a small end 24 adjacent the closed end.
‘I may provide an enlarged or thickened portion 26 in
the cap or shell generally at the open end which may be
formed with a threaded inner surface ‘or relief surface 28
on the inside, although this is not necessary. The threads
may be molded directly into the inside, and the large end
22 of the coil meshes into the groove of the threads. I
prefer to make the cap or shell out of nylon, or poly
ethylene, ‘or any other suitable thermoplastic material
which is tough but somewhat resilient and at the same
‘time is a good dielectric and suitable for high temperature
use.
taken an enlarged set and could open up su?iciently so
that the ball would otherwise fall out. But this can only
occur after the connector has been used at least once and
possibly more. And when the connector has been used
the ball will have been forced into the socket and will
stay in place.
The use, operation and function of the invention are
as follows:
The inner surface of the bore may remain somewhat
I provide a cap or cover which is preferably made of a
cylindrical from the open end toward the end wall but 55 stif?y ?exible plastic, such as nylon, polyethylene, or the
the intermediate or middle turns of the coil have ‘been
like. A wire coil is positioned in the cap and is held
shown as decreasing in diameter, or tapered, as at 29, so
that a clearance ‘or spacing is provided at 30 throughout
the majority or a substantial portion of the length of the
coil with respect to the inner surface of the cap, although
this is not necessary. This provides what is referred to as
therein in a suitable manner. The cap and coil, as a unit,
are then screwed down on the stripped ends of a plurality
of electric Wires in a known manner. The coil functions
like threads so that the cap and coil automatically ‘feed
down on the stripped ends of the wires ‘and will compress
a “free spring” connector.
the wires together and form grooves or threads thereon
An extended and possibly distended turn 32 may be
corresponding to the coil. The coil is interlocked to the
provided adjacent the small end of the coil to serve as a
cap so that when the cap is rotated, the coil will also be
guide or pilot for the small end to center it relative to'the 65 rotated.
axial bore of the cap. The spacing, shown at 36, is not
When the coil is screwed down on the Wires, the stripped
totally necessary and the coil may have a uniform pitch
ends will eventually pass completely through the coil and
throughout its length.
will engage the end wall of the cap. The ends of the
The end at of the coil may be extended slightly or
70 wires have normally been cut or snipped with electrician’s
pulled away from the normal turns of the coil and an
pliers or the like and are sharp or jagged. When the
abutment 38 may be provided in or ‘as an integral part
stripped ends contact the end wall of the cap, if the cap is
3
3,056,85l
4
thereafter turned an ‘appreciable amount, the sharp ends
of the wires may rip or drill through or otherwise mar the
end wall which is plastic.
To prevent this, I position a ball insert or sphere or
spherical object in the cavity or socket between the end
of the coil and the end wall of the cap which functions as
a de?ector or guide, as well as a shield, for the end wall.
I claim:
a
1. In an article of manufacture, a connector for join
ing the stripped ends of two or more electric wires and
the like, including a cap of a sti?iy ?exible plastic mate
rial capable of being penetrated by the wire ends with a
generally central bore open at one end and closed by an
end Wall at the other end, a generally cylindrical wire coil
This is to say that in addition to preventing direct contact
between the sharp ends of the wires and the end wall, the .
in the bore, an insert having the general shape of a sphere
positioned between the inner end of the coil and the end
spherical object will de?ect or guide the stripped ends in 10 wall of the cap and having a diameter greater than the
an outward direction and at the same time will bend the
ends of the wires into a helical or circumferential direc
tion so that even if the stripped ends were extended and
inside diameter of at least a part of the coil, and means
dropped within the cap and then the spring may be in
serted and turned into place until it is fully seated. The
the cap accepting the sphere.
for holding the coil in the bore.
,
2. The structure of claim 1 further characterized in that
could get past the sphere, they would not contact the end
the sphere is con?ned between the end wall of the cap
wall. At the same time, the stripped ends will pass be 15 and the inner end of the coil, and is otherwise free for
tween the throat of the coil and the forward convex face
movement.
of the sphere and will become tightly interlocked resisting
3. The structure of claim 1 further characterized in
withdrawal.
that the inner end of the coil is provided with an enlarged
In a connector of the particular type shown, the throat
turn and with a reduced turn forwardly thereof toward
of the coil will expand when the stripped ends of the 20 the open end of the cap to de?ne a partial socket opposite
wires are inserted and in all probability will eventually
and spaced somewhat from the sphere.
come to an inside diameter which is greater than the out
4. The structure of claim 1 further characterized in
side diameter of the sphere. But this is of no consequence
that the sphere has an outside diameter which, while
since the presence of the wires will prevent the sphere
greater than the inside diameter of at least a part of the
from coming out.
25 coil, is less than the inside diameter of the bore.
The use of a ball has the advantage that, in assembly,
5. The structure of claim 1 further characterized in
it does not have to be oriented. The ball can be merely
that the end wall of the cap is formed into a socket inside
6. The structure of claim 1 further characterized in
ball in no way interferes with the drive or interlock be
30 that the end wall of the cap is formed into an inner tapered
tween the cap and coil since the abutment 38 is radially
outside of the circumference of the ball. The ball may
be totally free in the socket between the inner end of the
coil and the end wall of the cap. But since its diameter is
greater than that of the throat of the coil, it cannot get
out. The ball has the ‘additional advantage that it will
rotate when contacted by the stripped ‘ends of the wires
of the cap and having an initial diameter on the order
of the diameter of a sphere such that when the connector
is screwed down on the stripped ends of a plurality of
" electric wires and the wires contact the sphere and push it
and will provide a distributed area of contact under the
thrust of the stripped ends, thereby spreading the load
socket, the entrance to the socket opening into the bore
into the socket, the sphere will become lodged in the
socket in a tapered press ?t.
7. ‘In an article of manufacture, a connector for join
ing the stripped ends of two or more electric wires and
and preventing a failure. The ball does not have to be 40 the like, including a cap of a sti?ly ?exible plastic capable
truly spherical but I want it to be self-orienting.
of being penetrated by the wire ends with a generally
The ball may be simply dropped into the cap during
central bore open at one end and closed at the other end
manufacture and then the coil is screwed in and assembly
by an end wall, a generally cylindrical wire coil in the
is complete.v In this condition the ball will be loose. But
bore, an insert positioned freely between the inner end of
once the connector has been used the ball will be forced 45 the coil and the end wall and having a circular exterior
into the tapered socket and will thereafter stay in place.
with an outside dimension greater than the inside dimen
It should be noted that the spacing is such that when
sion of at least a part of the coil, and means for holding
loose, the ball is sufficiently behind the last turns of the
the coil in the bore.
spring, as ‘at 24 and 50‘, so that a certain amount of cavity
8. In an article of manufacture, a connector for join
behind the throat 50 is available to accept the stripped 50 ing the stripped ends of two or more electric wires and
ends of the wires when they come through the throat. In
the like, including a cap of a sti?ly ?exible plastic capable
effect, I provide a certain amount of cavity behind the
of being penetrated by the Wire ends with a generally
spring to ‘allow for some misalignment of the wires. This
central bore open at one end and closed at the other end
also allows the connector to hold on to the minimum
by an end wall, a generally cylindrical wire coil in the
5 bore, the end wall of the cap being formed into an inner
combinations. The ball is free prior to use of the con
nector and will actually rattle around a bit. But when
socket, one end of the socket opening in the bore of the
the connector is turned upright with the bore up and the
cap, and an insert positioned freely between the inner
ball resting on the inlet of the tapered socket, there will
end of the coil and the socket in the cap and having an
be suf?cient spacing between the top of the ball and the
outside dimension slightly greater than at least a portion
throat 70 such that the stripped ends of the wires can
of the diameter of the socket such that when the con
work their way in during assembly.
nector is screwed down on the stripped ends of a plurality
Since the ball is round, it de?ects the wires on an angle
of electric Wires and the Wires contact the insert and force
other than what the connectors would ordinarily take.
In fact, the wires actually bend around and become inter
locked behind the coil.
it toward the socket, the insert will become lodged in the
socket in a press ?t.
7
While I have shown and described the preferred form
and suggested several variations of my invention, it should
be understood that several additional modi?cations, sub
stitutions, alterations and changes may be made without
departing from the invention’s fundamental theme. The
.
9. In an article of manufacture, a connector for join
ing the stripped ends of two or more electric wires and
the like, including a cap of a stif?y ?exible material other
wise capable of being penetrated by the wire ends with a
generally central bore open at one end and closed by an
end Wall at the other end, a generally cylindrical wire
coil in the bore, means for holding the coil in the bore,
and a de?ector in the bore at the end wall for preventing
it might be any other suitable material. With these and
the wire ends from penetrating the end wall having an
other modi?cations in mind, I wish that the invention be
outside dimension appreciably less than the inside di
75 mension of the bore at the end wall.
unrestricted, except as by the appended claims.
cross section of the wire may be round, square, or other
wise. I mentioned nylon as the material of the cap but
8,056,851
5
6
10. The structure of claim 9 in which ‘the de?ector is
2,199,532
Weeks _____ __.__________ __ May 7, 1940
in the form of an insert formed separartely from mhe cap
2,308,286
Joyce __- ______________ __ Jan. 12, 1943
and coil.
2,890,266
3,001,002
Bollmeier ____________ __ June 9, 1959
Schinske _________ "0-- Sept. 19, 19611
2721928
Switzerland ~~ --------- -— APY- 2’ 1951
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,110,458
LApplegate ____________ __ Mar, 3, 19-33
5
FOREIGN PATENTS
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