U.S. patent number 3,627,942 [Application Number 04/358,548] was granted by the patent office on 1971-12-14 for terminal block having an opening therein with normally engaged contacts in alignment with the opening and a plug for engagement with the contacts.
This patent grant is currently assigned to AMP Incorporated. Invention is credited to Clifford Frank Bobb.
United States Patent |
3,627,942 |
Bobb |
December 14, 1971 |
TERMINAL BLOCK HAVING AN OPENING THEREIN WITH NORMALLY ENGAGED
CONTACTS IN ALIGNMENT WITH THE OPENING AND A PLUG FOR ENGAGEMENT
WITH THE CONTACTS
Abstract
A terminal block and plug are disclosed, the block comprising a
plurality of stacked block members having openings therein, each
opening having normally engaged contact means therein, the plug
having means for engaging the contacts and being insertable into
the openings. The plug is rotatable in the openings to make and
break the contact means disposed in the openings.
Inventors: |
Bobb; Clifford Frank (Carlisle,
PA) |
Assignee: |
AMP Incorporated (Harrisburg,
PA)
|
Family
ID: |
59091792 |
Appl.
No.: |
04/358,548 |
Filed: |
April 9, 1964 |
Current U.S.
Class: |
200/51.07;
200/51.1; 439/45; 200/51.12; 439/680 |
Current CPC
Class: |
H01R
13/62 (20130101); H01R 29/00 (20130101); H01R
24/58 (20130101); H01R 4/2491 (20130101); H01B
1/00 (20130101); E01B 7/24 (20130101); H01R
13/703 (20130101); H01R 2107/00 (20130101) |
Current International
Class: |
E01B
7/24 (20060101); H01B 1/00 (20060101); E01B
7/00 (20060101); F23D 14/12 (20060101); H01R
29/00 (20060101); H01R 24/04 (20060101); H01R
4/24 (20060101); H01R 24/00 (20060101); H01R
13/62 (20060101); H01R 13/70 (20060101); H01R
13/703 (20060101); H02r 033/30 () |
Field of
Search: |
;200/51.09,51.1,51.07,51.12
;339/186,186M,183,198,198G,198.1,15B,161B,196,176P ;179/96 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Smith, Jr.; David
Claims
What is claimed is:
1. A terminal block comprising at least one block member having at
least one opening therein, contact members disposed in said block
member and having semicircular sections in alignment with said
opening and with the free ends thereof in normal engagement to
define a substantially circular contact area, means in said block
member and on said contact members to maintain said contact members
in normal engagement and in alignment with said opening, the
diameter of said contact area being less than that of said opening,
said semicircular sections upon being engaged by contact means of
plug means providing contact therewith before the free ends are
disengaged, and the free ends in disengaging and reengaging slide
along their respective portions of the semicircular sections
thereby cleaning these contact areas, and another block member
disposed on said one block member and having a hole in alignment
with said opening, the diameter of said hole being less than that
of said opening, said hole having diametrical recesses with the
diameter therebetween being about equal to that of said opening,
and recesses mating with corresponding sides of said plug means to
polarize insertion of said plug means into said opening without
said contact means engaging said contact area.
2. A plug member comprising a dielectric contact-carrying member
having rounded sides, contact means oppositely disposed on said
rounded sides in recesses thereof to define substantially smooth
sides, a dielectric hollow tubular member fitted over substantially
the entire length of said contact-carrying member and being
provided with slots extending along said sides so that said sides
and contact means thereon project outwardly through said slots, and
means connecting said contact-carrying member and said tubular
member to lock said contact-carrying member and tubular member
together to form a unitary structure, edges of said slots engaging
said contact means to thereby hold said contact means in said
recesses.
3. A plug member according to claim 2 wherein said contact means
are connected to insulated conductor means, strain-relief means
having a section secured to the insulation of said conductor means
and another section for engagement with said contact-carrying
member to provide strain relief for said conductor means.
4. A plug member according to claim 2 wherein said hollow tubular
member includes surfaces extending outwardly therefrom which are
disposed in a direction normal to that of said slots and are spaced
therefrom.
5. A plug member according to claim 4 wherein one of said outwardly
extending surfaces is pointed to indicate the direction in which
said plug member is connected within a terminal block.
6. A plug member comprising a dielectric contact-carrying member
having rounded sides provided with spaced and opposed recesses
therein, contact members disposed in said recesses and filling same
to define substantially smooth sides, a dielectric hollow tubular
member extending over the said contact-carrying member and
extending along substantially the length thereof, said tubular
member having diametrical slots extending along said sides and
contact members so that said sides and contact members thereon
project outwardly through said slots beyond said tubular member,
and locking means on said contact-carrying member and said tubular
member maintaining said contact-carrying member and said tubular
member together to form a unitary structure, edges of said slots
engaging said contact members and keeping said contact members in
place in said recesses.
7. A terminal block comprising at least one block member having at
least one opening therein, contact members disposed in said block
member and having semicircular sections in alignment with said
opening and with the free ends thereof in normal engagement to
define a substantially circular contact area, means in said block
member and on said contact members to maintain said contact members
in normal engagement and in alignment with said opening, the
diameter of said contact area being less than that of said opening,
said semicircular sections upon being engaged by contact means of
plug means providing contact therewith before the free ends are
disengaged, and the free ends in disengaging and reengaging slide
along their respective portions of the semicircular sections
thereby cleaning these contact areas, and means on said block
member coaxial with said opening and matable with the configuration
of the plug means to polarize insertion of said plug means into
said opening without said contact means engaging said contact area.
Description
This invention relates to a terminal block and a plug therefor.
More particularly, the present invention is directed to a telephone
terminal block and a plug therefor, the combination of which
performs a number of operations.
Telephone terminal blocks have been inserted between the plant
equipment and subscriber's equipment in order to perform various
functions on telephone circuits, such as, monitoring, test the line
circuits, jumper the line circuits, disconnect the line circuits,
etc. These terminal blocks and the shoes or plugs therefor have
proved to be complicated, some contain moving parts, their
versatility is limited and, in general, have not proved
satisfactory.
It is, therefore, an object of the present invention to provide a
terminal block and plug assembly which is simple of construction
and ease of operation and which overcomes the above-mentioned
drawbacks.
Another object of the present invention is to provide a terminal
block and plug assembly wherein the function being performed and
the direction thereof is visibly indicated.
A further object of the present invention is to provide a terminal
block and plug assembly including a positive locking arrangement of
the plug within the terminal block to prevent accidental
removal.
An additional object of the present invention is the provision of a
terminal block and plug assembly wherein the plug always makes
contact with a circuit upon which it is being operated before
breaking or shunting the circuit.
A still further object of the present invention is to provide a
terminal block and plug assembly wherein the input or output of a
plug connection can be readily changed.
A still other object of the present invention is the provision of a
terminal block and plug assembly which is reliable, versatile,
economical and has a self-cleaning contact feature.
Other objects and attainments of the present invention will become
apparent to those skilled in the art upon a reading of the
following detailed description when taken in conjunction with the
drawings in which there is shown and described an illustrative
embodiment of the invention; it is to be understood, however, that
this embodiment is not intended to be exhaustive nor limiting of
the invention but is given for purposes of illustration and
principles thereof and the manner of applying it in practical use
so that they may modify it in various forms, each as may be best
suited to the conditions of a particular use.
In the drawings:
FIG. 1 is a perspective part sectional view of the terminal block
and plug assembly;
FIG. 2 is a perspective exploded view of the plug;
FIG. 3 is a perspective view of the plug in assembled
condition;
FIG. 4 is a sectional view taken along lines 4--4 of FIG. 1;
FIG. 5 is a sectional view taken along lines 5--5 of FIG. 1;
and
FIG. 6A-H are diagrammatic views of different ways by which the
present invention may be used.
Turning now to the drawings and more particularly FIGS. 1-4, there
is illustrated a terminal block TB and plug or shoe members PM.
Terminal block TB comprises a plate member 1 having on each side
parallel rows of staggered holes 2 and 3 and each end has a recess
4 (only one being shown) to receive a screw or similar device for
mounting purposes. One or any number of such rows of staggered
holes may be provided. A number of stacked contact-carrying block
members 5 of insulation material, such as, plastic or the like, are
disposed on plate member 1 between the rows of holes 2 and 3. Three
such contact-carrying block members are illustrated, but one up to
any number can be used.
Each member 5 has parallel rows of holes 6 and 7 with the holes in
one row staggered with respect to the holes in the other row. While
only two rows of holes have been illustrated, it is obvious that
one up to any number may be provided. The sides and ends of upper
surface 8 of member 5 has an upwardly directed continuation 9
defining a border. Extending upwardly from surface 8 between
adjacent holes of the row of holes 6 and the row of holes 7 are
projections 10 having diametrical surfaces 11 which are arcuately
shaped and coincident with the adjacent holes thereby having the
same radii as they have.
Midway between each projection 10 is a slot 12 which divides the
projection into equal parts and this slot continues as a recess 12'
downwardly a short distance below surface 8. Projections 10 at one
end of the block member as illustrated in FIG. 4 merge with border
9 and have a single surface 11 coincident with the end holes. One
of these end projections has slot 12 therein while the other
projection has extending upwardly therefrom a keying member 13
which mates with a recess 14 in the bottom surface of the adjacent
block in engagement therewith to properly align the block members.
The other end of the block member is conversely arranged since the
outermost hole in one end will be the innermost at the other end
due to the staggered relationship. Each end of block member 5 has
an arcuate depression 15 in alignment with recess 4 to facilitate
engagement with the mounting screw, bolt or nut.
Diametrical slots 16 are disposed in each side of border 9, a pair
of which are in alignment with each hole and are contained in the
vertical plane in which the axis of the hole is contained. Each
pair of slots is also in alignment with a slot 12. Every other slot
in each side of border 9 has a recess 17 which is disposed below
surface 8. Each hole has associated therewith a pair of contact
elements 18 and 19.
Both contact elements comprise a shank section 20 and a
semi-circular section 21. Section 20 has spaced inclined recesses
22 into which conductor members (not shown) are to be disposed, a
channel 23 formed therein for strengthening purposes and a
projection 24.
Section 21 of each contact element extends outwardly from shank
section 20 and is more narrow as shown more clearly in FIG. 5. The
inner portion of section 21 which includes an angular disposition
of about 120.degree. - 130.degree. has the same radius while the
remainder thereof is substantially straight to the free end which
has a rounded edge. The outermost point of the free end is normally
in a plane beyond the plane containing the shank section and
parallel therewith.
As can be discerned, contact element 18 is the shorter one, and
when it is placed in block member 5, shank portion 20 is disposed
in slot 16, projection 24 thereof is disposed in recess 17 and
semicircular section 21 has a portion lying across the hole with
which it is to be associated. Contact element 19 is the longer one,
and when it is placed in block member 5, shank portion 20 is
disposed in slots 16 and 12, projection 24 thereof is disposed in
recess 12' and semicircular section 21 has a portion lying across
this hole. As shown in FIG. 4, contact elements 18 and 19 form a
pair in association with a hole in correspondence therewith, and
the rounded free end of one contact element engages the other
contact element beyond the point where the semicircular
configuration begins. Shank portions 20 are in alignment with a
corresponding hole 2,3 in plate member 1 through which the
conductors pass and then are affixed in recesses 22. One of
semicircular sections 21 has an outwardly directed bump 21'
therein.
An upper block member 25 having ends and sides of the same
configuration as block members 5 is keyed onto topmost block member
5 by recesses 14 located in the bottom surface. Holes 26 are
located in block member 25 in correspondence with holes in rows 6
and 7, and the part containing holes 26 is about half the thickness
of block member 25. Each hole 26 has a diameter less than the
diameter of the holes in rows 6 and 7. Semicircular recesses 27 are
diametrically disposed in each hole 26 and the distance between
both recesses is equal to the diameter of the holes in rows 6 and 7
as illustrated in FIG. 5. Aligned holes (not shown) extend through
the block members and plate member 1 to receive screws 28 to secure
these members together in stacked alignment, to maintain the
contact elements in place and to define staggered aligned openings
each of which include at least one pair of engaged contact
elements. A channel 29 is disposed in the top surface of block
member 25 to receive indicia and projections 30 overlie this
channel to hold the indicia therein after it has been threaded into
position.
Turning now to plug member PB and more particularly FIGS. 2 and 3,
a stripped multiple-conductor means 31 has a contact member 32
affixed to each conductor 33. Contact member 32 has an almost
cylindrical section 34, the free end of which is rounded in the
manner as that of contact elements 18 and 19.
A contact-mounting member 35 of insulating material comprises a
flat section 36 having sides 37 which are about twice the thickness
of section 36 and are rounded. Diametrical recessed sections 38 are
disposed in spaced relationship along each rounded side, which are
rounded and of less diameter than the rounded sides but thicker
than section 36. The spacing of recessed sections 38 corresponds to
the spacing of each pair of contact elements 18 and 19 in block
members 5. Cylindrical sections 34 of contacts 32 flexibly engage
sections 38, and the thickness of sections 34 on sections 38 render
the outer surfaces thereof coincident with that of sides 37.
One up to six contacts can be placed on member 35 as illustrated,
but, of course, more can be applied by lengthening this member. The
flexibility of the material of the contacts maintains them on
sections 38.
A portion 39 extends outwardly from section 36 and contains
diametrical recesses 40 disposed in the sides thereof. Recesses 40
receive lugs 41 (only one being shown) of a retaining member 42
having a cylindrical part secured to the insulation of conductor
means 31. As can be discerned, lug 41 includes an extension 43
whose flat surfaces engage portion 39 to maintain retaining member
42 in position.
Bottom 44 of section 36 has a configuration similar to that of
holes 26 in block member 25; however, the circular part has a
smaller diameter than holes 26 but sides 37 will slidably fit into
recesses 27 thereof. At the bottom of sides 37 is a disc-shaped
section 45 concentric with the circular part of bottom 44 and which
has a diameter slightly less than that of holes 26. Arcuate-shaped
openings 46 (only one being shown) are contained in section 45 from
one side to the next. A hole 47 extends through the circular part
of bottom 44.
A cover member 48 comprises a hollow tubular section 49 having a
diameter equal to that of section 45 which fits over
contact-mounting member 35 as shown in FIG. 3 and has diametrical
slots 50 (only one being shown) to allow sides 37 and cylindrical
sections 34 of contact 32 to be exposed. Slots 50 also engage
contacts 32 to hold them securely in place. Arcuate-shaped
projections 51 are located at the bottom of member 48 which mate
with arcuate-shaped openings 46 to hold the bottom of the cover
member in place. Holes 52 in member 48 correspond in position to
that of hole 47, and a pin 53 passes through these holes to secure
members 35 and 48 together to form a plug for insertion into holes
26 and the holes of rows 6 and 7 in terminal block TB.
Cover member 48 includes a top section 54 which has a hole 55 to
allow conductor means 31 to pass therethrough and surfaces 56
projecting diametrically outwardly from section 49 in a direction
normal to slots 50 and spaced from the top of these slots a
distance slightly in excess of the height of holes 26 in block
member 25.
Thus, sides 37 of the plug member and recesses 27 in holes 26 of
block member 25 define polarizing means to always insure that the
plug member is inserted into one of the aligned openings in the
terminal block without engaging and thereby interrupting the
engaged contact elements therein. After the plug member has been
inserted into one of the aligned openings, whereby surfaces 56
engage the top surface of block member 25, the plug member can be
rotated 360.degree.. At 0.degree. and 180.degree., the plug member
can be removed from the terminal block, but any other angular
disposition will cause the plug member to be locked in the terminal
block because of the normal and spaced dispositions between
surfaces 56 and sides 37. This provides a locking means for the
plug member to maintain the plug member within the terminal block
and to prevent accidental removal therefrom. Part 57 of section 54
is pointed to define an indicating means on the plug member which,
in accordance with the functions to be performed, indicates in
which direction through the circuit in the terminal block it is
being performed. The height between the bottom of the plug member
and surfaces 56 thereof corresponds to that between plate member 1
and the top of block member 25 of the terminal block.
OPERATION
The operation of the plug member within the terminal block will be
described in connection with FIG. 4. As shown in the bottom pair of
engaged contact elements 18 and 19, sections 34 of contacts 32 are
within semicircular sections 21 and are in alignment with the
shanks of these contact elements; the circuit connected through
these contact elements remains connected. Upon rotation of the plug
member in either direction, sections 34 engage semicircular
sections 21 as illustrated in the middle pair of contact elements
and make contact therewith before the contact elements become
disengaged; and upon further rotation of the plug member, the
contact elements are disengaged from each other. The plug member is
rotated 90.degree. as shown by the top pair of contact elements
whereupon one of sections 34 engages bump 21' to hold the plug
member at this position. Semicircular sections 21 may engage
surfaces 11 of projections 10 to limit their movement. Thus, it can
be discerned that the present invention discloses a make before
break arrangement which can be useful for a number of different
functions, some of which will be discussed subsequently.
It should be pointed out that by sections 34 engaging semicircular
sections 21, there is always provided a wiping action between these
engaging sections which is highly desirable because this provides a
self-cleaning feature. In addition, when the free ends of
semicircular sections are disconnected and reconnected via the
action of the plug member, these free ends slidably disengage and
reengage the respective semicircular sections so that a
self-cleaning action is also performed at these locations on the
contact elements.
When the plug member engages the contact elements, contact element
18 will pivot from slot 16 in border 9 while contact element 19
will pivot from slot 12 in projection 10. Since contact element 19
has a longer lever arm than contact element 18, it is the general
case that the free end of the semicircular section of contact
element 19 will become disconnected from that of contact element 18
before the free end of the semicircular section of contact element
18 becomes disconnected from that of contact element 19. However,
regardless of which free end becomes disconnected first or they
become disconnected simultaneously, there is a make with the plug
member before a break of these contact elements; and, therefore,
continuity, if desired, will also be maintained.
As shown in FIGS. 1 and 5, each aligned opening in the terminal
block contains three pairs of contact elements which is the
conventional arrangement for telephone circuits; however, the
present invention contemplates that the terminal block and plug
assembly may conveniently be used in conjunction with other
arrangements, such as, for example, the power field with single and
three-phase circuitry.
FIG. 6 diagrammatically illustrates a single row of contact
elements in plan view and some of the uses of the present
invention. FIG. 6A illustrates a broken circuit when it is desired
to discontinue the circuit such as, for example, to a delinquent
subscriber. The plug member, in this instance, has no external
connections.
FIG. 6B shows the plug member connected to reproducing means, such
as, for example, ear phones to monitor any of the circuits and the
contacts on each side are interconnected for this purpose.
FIG. 6C shows two plug members connecting an input circuit to
another output circuit since the normal output circuit could be
noisy or working improperly for some unknown reason.
FIG. 6D represents crossing the inputs and outputs of two circuits
as when subscribers move from different parts of an exchange to
other parts thereof.
FIG. 6E is similar to FIG 6B in that test equipment is placed in
shunt with the circuit to perform a test thereon.
FIG. 6F is directed to a novel manner to test the input and output
of a particular circuit. In this example, the plug member has
connections to only one side thereof to the test equipment, and the
pointed edge of the plug indicates whether the output or input side
of the circuit is being tested in order to establish on which side
of the circuit the trouble exists.
FIGS. 6G and 6H illustrate respectively parallel outputs and
parallel inputs between two different circuits.
While the foregoing represent some of the uses of the present
invention, others can, no doubt, be visualized to perform other
functions.
As can be discerned, there has been disclosed a novel and useful
terminal block and plug assembly which is simple to manufacture,
easy to operate and provides self-cleaning contacts of the terminal
block and plug.
It will, therefore, be appreciated that the aforementioned and
other desirable objects have been achieved; however, it should be
emphasized that the particular embodiment of the invention, which
is shown and described herein, is intended as merely illustrative
and not as restrictive of the invention.
* * * * *