U.S. patent number 3,861,776 [Application Number 05/323,541] was granted by the patent office on 1975-01-21 for electrical connector with terminal lock means.
This patent grant is currently assigned to Multilam Corporation. Invention is credited to Robert S. Deal.
United States Patent |
3,861,776 |
Deal |
January 21, 1975 |
ELECTRICAL CONNECTOR WITH TERMINAL LOCK MEANS
Abstract
An electrical connector of the type having a tubular array of
spaced, angled louvers resiliently connected to a pair of axially
spaced, generally circular end bands. The connector is adapted to
be inserted into a tubular first terminal and to receive a
jack-like second terminal so that the louvers will be in bridging
electrical contact with the terminals. The connector has a number
of teeth integral with one of the bands for engaging a portion of
the second terminal after the latter has been inserted into the
connector for holding the second terminal against removal
therefrom.
Inventors: |
Deal; Robert S. (Mountain View,
CA) |
Assignee: |
Multilam Corporation (Los
Altos, CA)
|
Family
ID: |
23259648 |
Appl.
No.: |
05/323,541 |
Filed: |
January 15, 1973 |
Current U.S.
Class: |
439/434; 439/843;
439/380 |
Current CPC
Class: |
H01R
13/187 (20130101) |
Current International
Class: |
H01R
13/15 (20060101); H01R 13/187 (20060101); H01r
013/20 () |
Field of
Search: |
;339/74,95,256,258,253
;174/84R,88R,94R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: McGlynn; Joseph H.
Claims
I claim:
1. An electrical connector comprising: an electrically conducting,
unitary body having a pair of spaced, annular bands having a common
central axis, a plurality of spaced louvers integral with the bands
and extending therebetween, the louvers being disposed about said
central axis, being at respective inclined positions relative to
diametral planes passing therethrough, and projecting laterally
from the connections thereof with said first bands, whereby one
side of each louver will engage the inner surface of a first,
tubular terminal in which said body is positioned and the opposite
side of each louver will be disposed to engage the outer surface of
a second, jack-like terminal inserted into the body; a third
annular band spaced from one of said pair of bands and being
concentric to said axis; means connecting the third band to said
one band; and a plurality of spaced teeth integral with the third
band and being inclined relative thereto, the teeth extending
inwardly of the third band and in a direction away from said one
band, said teeth adapted to engage the outer surface of said second
terminal after the latter has been inserted in one direction into
said body to thereby lock said second terminal against movement in
the opposite direction out of said body.
2. An electrical connector as set forth in claim 1, wherein said
connecting means includes a plurality of spaced connecting elements
integral with said one band and said third band.
3. An electrical connector as set forth in claim 1, wherein said
bands, said louvers and said teeth are formed from an initially
flat sheet of electrically conducting material, said bands being
initially flat and being moved into circular configurations about
said axis.
4. An electrical connector as set forth in claim 1, wherein is
provided a second body substantially identical to said first body
and being axially spaced therefrom, said second body including a
pair of spaced, annular bands concentric to said axis, a plurality
of spaced louvers integral with the last-mentioned bands and
spanning the distance therebetween, said louvers being disposed
about said central axis at an angle relative to diametral planes
passing therethrough, a fourth band spaced from the last-mentioned
pair of louvers and from the third band a plurality of spaced teeth
integral with said fourth band and projecting therefrom at an angle
toward the teeth of the third band, and means integral with the
third and fourth bands for interconnecting the same and thereby
said bodies, each body having an open, terminal-receiving end.
5. An electrical connector as set forth in claim 4, wherein said
interconnecting means comprises a fifth band between and spaced
from said third and fourth bands, and means integral with said
fifth band for connecting the same to said third and fourth
bands.
6. An electrical connector comprising: a tubular, electrically
conducting body having a central axis, a pair of spaced, circular
bands, and a plurality of spaced, longitudinally extending, outer
peripheral louvers disposed about said central axis and spanning
the distance between and being integral with said bands, said body
adapted to receive a terminal therewithin and said louvers adapted
to engage the terminal when the latter is received within said
body; and means on the body for holding said terminal received
therein against removal therefrom, said holding means including a
third band spaced from and coupled to one of said pair of bands
near one end of the body, and a plurality of spaced teeth integral
with and extending laterally from said third band in a direction
away from said pair of bands, said teeth being inclined and
disposed for engaging the outer surface of said terminal after the
latter has been inserted into the body through the opposite end
thereof.
Description
This invention relates to improvements in devices for enhancing the
electrical contact between a pair of electrical terminals and, more
particularly, to an electrical connector of the type having a
plurality of electrically conducting louvers arranged in a tubular
array.
BACKGROUND OF THE PRIOR ART
In U.S. Pat. No. 3,426,587, there is disclosed a tubular electrical
conductor comprised of a pair of spaced, generally circular bands
between which are disposed a number of spaced, electrically
conducting, oblique louvers arranged about the common, central axis
of the bands. The connector is adapted to be inserted into a
tubular first terminal and to receive a second jack-like terminal.
The louvers are adapted to engage both terminals as they
resiliently bear against the inner surface of the first terminal
and the outer surface of the second terminal. In this way, maximum
current transfer between the terminals can be achieved yet the
second terminal can be pulled out of the first terminal and
re-inserted many times.
In some situations, it is desirable that the terminals be
permanently connected together. For instance, in the wiring of
houses, buildings and the like, it is desirable to have a permanent
connection between each wire and a terminal to a junction box. At
the present, plastic-covered screw-type connectors are used to lock
several spliced wires together. While the conventional screw-type
connector has proven satisfactory to some extent, it has certain
limitations in that time and effort are required to couple it to a
pair of wires and breakage of the plastic cover sometimes
occurs.
In U.S. Pat. No. 3,161,451, an electrical connector is disclosed
wherein the connector has a number of circumferentially spaced
contact springs arranged in a tubular array for making bridging
contact between a first, tubular terminal and a second, jack-like
terminal. The patent further discloses a releasable holding means
removably carried by the first terminal and engageable with the
second terminal to releasably hold the latter in the first
terminal. However, the holding means, being separate from either
terminal, requires assembly time and effort. Moreover, the second
terminal must be of a special construction. Specifically, it must
be provided with an annular groove for receiving portions of the
holding means. Because of its special character, the connector of
this patent would be expensive to make and would be limited to a
special type of terminal.
SUMMARY OF THE INVENTION
The present invention is directed to an improved electrical
connector of the type adapted to be carried in a first, tubular
terminal having a plurality of louvers in a tubular array. The
connector is adapted for use in receiving one or more second
terminals and for permanently holding the same against removal
therefrom as the louvers make bridging electrical contact between
the terminals. In a preferred embodiment of the invention, the
connector is provided with spaced teeth integral with the normally
innermost of the two circular bands to which the louvers are
connected. The teeth extend inwardly of the tubular array of
louvers and downstream with respect to the normal direction of
insertion of the second terminal thereinto. Thus, the teeth, when
the second terminal has been inserted, will engage and "bite" into
the outer surface of the second terminal and prevent its retrograde
movement out of the connector thereby holding the second terminal
in a substantially permanent operative position.
The present invention has a wide variety of applications. Moreover,
a number of second terminals, such as several wires twisted or
spliced together, can be held permanently in place in the connector
of this invention, yet the louvers of the connector will provide
the desired electrical contact between the second terminals and the
first terminal in which the connector is mounted.
The primary object of this invention is to provide an improved
electrical connector of the type adapted to be mounted in a first,
tubular terminal and having a plurality of electrically conductive
louvers arranged in a tubular array for receiving a second terminal
for making bridging electrical contact between the terminals,
wherein the connector is provided with means thereon for
permanently holding a second terminal therein to thereby assure a
permanent connection between the terminals merely by inserting the
second terminal in the connector.
A further object of this invention is to provide a connector of the
type described wherein the connector has a plurality of spaced
teeth along the innermost, circular edge thereof with the teeth
being oriented to grip and hold a terminal against movement out of
the array once the terminal has been inserted thereinto so as to
permanently maintain the terminal in its normal operative condition
in electrical contact with the louvers.
Other objects of this invention will become apparent as the
following specification progresses, reference being had to the
accompanying drawing for an illustration of the invention.
In the drawings:
FIG. 1 is a side elevational view of a part of one embodiment of
the connector of this invention with the connector flattened out
and before the same is moved into a configuration in which the
louvers thereof form a tubular array;
FIG. 2 is a cross-sectional view taken along line 2--2 of FIG.
1;
FIG. 3 is a perspective view of the connector in its operative
configuration, and illustrating the way in which it receives a
jack-like terminal;
FIG. 4 is a cross-sectional view of the connector, showing the way
in which the locking teeth thereof engage a terminal therein;
and
FIG. 5 is a view similar to FIG. 1, but showing a second embodiment
of the connector.
One embodiment of the electrical connector of this invention is
broadly denoted by the numeral 10 and is shown in FIGS. 1-4.
Connector 10 is formed in integral fashion from a sheet of suitable
electrically conducting material, such as beryllium copper or the
like. Connector 10 is formed in any suitable manner, such as by a
stamping process. It includes a pair of spaced bands 12 and 14 to
which a number of spaced louvers 16 are coupled in spanning
relationship therebetween. Each louver has a pair of opposed,
curved sides 18, the sides being convex so that the end connections
of each louver to bands 12 and 14 have reduced widths, thereby
rendering the louvers resiliently connected to the bands and
capable of twisting or rocking slightly about the longitudinal axis
of the louver.
Bands 12 and 14 are adapted to be formed into circular
configurations as shown in FIG. 3 so that louvers 16 will be
arranged in a tubular array. Moreover, the louvers are formed so
that they are oblique to bands 12 and 14 as shown in FIG. 2. Thus,
one side 18 of each louver 16 will engage an outer, first, tubular
terminal, such as an electrically conducting sleeve and the
opposite side 18 of each louver will be in a position to engage the
outer surface of a second, jack-like terminal 20 when the latter is
inserted within connector 10. Thus, louvers 16 will enhance the
electrical contact between the terminals to minimize losses and to
optimize the energy transfer therebetween.
Connector 10 is provided with a plurality of spaced tongues 22
integral with and projecting outwardly from the outer side edge 24
of band 12. Similarly, a plurality of spaced tongues 26 are
integral with and project outwardly from the outer side edge 28 of
band 14. Tongues 22 and 26, when connector 10 is in the
configuration of FIG. 3, are inclined with respect to respective
bands 12 and 14 as shown in FIG. 2 and are adapted to engage the
inner surface 30 of the tubular terminal 32 in which connector 10
is carried. Thus, tongues 22 and 26 provide standoff means to
properly position louvers 16 so that first sides 18 thereof
properly make electrical contact with inner surface 30.
Device 10 includes lock means 34 thereon adjacent to band 14. Lock
means 34 includes a third band 36 integral with band 14 by means of
a number of connector elements 38 parallel with and adjacent to
tongues 26.
Band 36 has a number of spaced teeth 40 integral therewith and
projecting laterally from the outer margin 42 thereof. Teeth 40 are
adapted to be formed so that they are inclined with respect to band
36 as shown in FIGS. 2 and 4. Each tooth 40 has an outer edge 44
adapted to engage and thereby "bite" into the outer surface 46 of
terminal 20 to hold the latter against movement in the direction of
arrow 48 out of connector 10 after the terminal has been inserted
thereinto.
In operation, connector 10 is formed into the configuration of FIG.
3, then inserted into an operative position in terminal 32 with
first sides 18 of louvers 16 in electrical contact with inner
surface 30 of terminal 32. When the connector is in such position,
louvers 16 are oblique with respect to the central axis of the
connector and tongues 22 and 26 also engage surface 30 as shown in
FIG. 4. The opposite sides 18 of louvers 16 thus project into the
tubular space surrounded by bands 12 and 14 and thereby in position
to engage the outer surface 46 of terminal 20 when the latter is
inserted therewithin. Also, teeth 40 are inclined, i.e., they
extend into the aforesaid tubular space and downstream with respect
to the direction of insertion of terminal 20 into connector 10.
When terminal 20 is inserted in connector 10, teeth 40 engage and
"bite" into surface 46 while louvers 16 also engage the same. Teeth
40 are arranged so that they prevent retrograde movement of
terminal 20 out of the connector, i.e., in the direction of arrow
48. Thus, terminal 20 is permanently connected to connector 10.
While terminal 20 has been shown as being formed of a single
member, it may be formed of several members, such as a pair of
wires twisted and spliced together. In such a case, the spliced
wires will have a composite outer surface and louvers 16 and teeth
40 will engage such composite surface in the manner described above
with respect to surface 46.
The teachings of the invention can be applied to a connector for
insertion into a first, tubular terminal wherein the terminal has a
pair of open ends to permit second terminals to be inserted
thereinto from opposite ends thereof. To this end, a connector 110
(FIG. 5) is formed by a stamping process or the like from a single
sheet of electrically conducting material, the forming operation
being such that a unitary construction is achieved which, in
effect, comprises two connectors 10 (FIG. 1) integral with each
other. Thus, connector 110 includes a first connector section 110A
and a second connector section 110B, each section being identical
with the other and comprised of a pair of spaced bands 112 and 114,
a plurality of spaced louvers 116 spanning the distance between
bands 112 and 114 and standoff tongues 122 and 126 on respective
bands 112 and 114. Each connector section further includes terminal
locking means 134 comprised of a third band 136 provided with
spaced, laterally projecting teeth 140 thereon. Each band 136 is
connected to the adjacent band 114 by integral connecting elements
138. Also, a pair of central bands 142 and 144 are connected by
connecting elements 146 to respective bands 136, band 142 having a
plurality of spaced standoff tongues 148 which serve the same
purpose as tongues 122 and 126. Thus, tongues 148 support the
central portion of connector 110 when the latter is in a tubular
configuration and inserted into a tubular open end terminal.
In operation, connector 110 is formed into a tubular configuration
with tongues 122, 126 and 148 being inclined with respect to the
various circular bands 112, 114, 136, 142 and 144 so that these
tongues engage the inner cylindrical surface of a tubular, open end
terminal (not shown) such as terminal 32 (FIG. 4). Thus, the
various louvers 116 will be in operative positions, similar to
those shown with respect to louvers 16 of FIG. 4. Also, teeth 140
on bands 136 will be inclined inwardly and extend toward each other
so that they will be in positions to engage and "bite" into
terminals inserted into respective connector segments from the
corresponding open ends of the tubular terminal in which connector
110 is carried. Thus, teeth 140 will function in the same manner as
that described above with respect to teeth 40 (FIG. 4) to prevent
retrograde movement of corresponding terminals from connector 110,
once the terminals have been inserted thereinto. The terminals are,
therefore, permanently coupled to connector 110 yet the various
louvers 116 engage the terminals to enhance the electrical contact
between the inserted terminals and the tubular terminal surrounding
connector 110.
The ends of the terminals in connector sections 110A and 110B can
butt up against each other if tongues 148 are not inclined or if
the tongues are removed altogether. Moreover, the terminal-engaging
teeth 140, like teeth 40 of connector 10, bite deeper into the
corresponding terminals when there is a tendency to pull outwardly
on the terminals. Thus, they are permanently locked in place in the
connector.
The present invention, therefore, provides an improved connector of
one-piece construction or enhancing the electrical contact between
two terminals yet serves to lock one of the terminals within the
tubular array of resilient louvers to provide a permanent
connection therebetween. The connector can be of any diameter and
can be formed from various types of electrically conducting
materials.
* * * * *