U.S. patent number 3,860,312 [Application Number 05/369,554] was granted by the patent office on 1975-01-14 for electrical slip coupling.
This patent grant is currently assigned to Welco Industries, Inc.. Invention is credited to Frank Gordon, Jr..
United States Patent |
3,860,312 |
Gordon, Jr. |
January 14, 1975 |
ELECTRICAL SLIP COUPLING
Abstract
The electrical slip coupling comprises elongate plug and socket
elements wherein the plug element constitutes a slip ring assembly
containing a plurality of laterally spaced conductor rings
separated by non-conductive regions and wherein the socket element
constitutes a brush holder assembly having a housing for receiving
the brush holder assembly, the housing containing a plurality of
conductor brushes, each brush in yieldable contacting relationship
with one of the conductor rings to produce selective electrical
continuity therebetween. The plug is adapted to be freely and
repeatedly inserted into and/or withdrawn from the socket without
adversely effecting the electrical continuity when coupled. The
subject coupling is ideally adapted, without change or alteration,
for association with the hinge pin and hinge pin-socket portion of
a hinge for establishing one or more electrical circuits between
the hinge halves.
Inventors: |
Gordon, Jr.; Frank (Cincinnati,
OH) |
Assignee: |
Welco Industries, Inc.
(Cincinnati, OH)
|
Family
ID: |
23455939 |
Appl.
No.: |
05/369,554 |
Filed: |
June 13, 1973 |
Current U.S.
Class: |
439/31 |
Current CPC
Class: |
H01R
39/64 (20130101); H01R 24/58 (20130101); H01R
35/04 (20130101); E05D 11/0081 (20130101); H01R
2107/00 (20130101); E05Y 2400/656 (20130101) |
Current International
Class: |
E05D
11/00 (20060101); H01R 24/04 (20060101); H01R
39/64 (20060101); H01R 35/00 (20060101); H01R
24/00 (20060101); H01R 39/00 (20060101); H01R
35/04 (20060101); H01r 039/64 () |
Field of
Search: |
;339/4,5,8,182,183 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Moore; Richard E.
Attorney, Agent or Firm: Kinney, Jr.; J. Warren
Claims
What is claimed is:
1. An electrical slip coupling including complementary socket and
plug elements;
said plug element comprising an elongate member having a plurality
of spaced, parallel conductor rings in circumscribing relationship
therewith;
said socket element comprising an elongate brush holder having a
plug-receptive bore therein;
a plurality of spaced, circumferential brush-receiving channels in
the outer surface of said holder wherein a portion of each channel
is in open communication with said bore;
a pluraltiy of resilient conductor brushes, one in each of said
channels, wherein each brush includes a plug-contact portion which
normally and yieldably extends into and beyond the inner surface of
the said bore;
an elongate, axially extending, conductor-receptive channel in the
periphery of said brush holder intersecting and in open
communication with each of said circumferential channels;
means engaging portions of the outer surface of the brush holder
and portions of the brushes and conductors received in said
circumferential and axial channels securing said brushes and
conductors to and against accidental or unintentional displacement
from said holder;
the peripheral surface of said plug element and the inner surface
of the bore of said socket element providing endwise, longitudinal
and free rotary relative motion between said plug and socket
elements;
the plug-contacting portion of each of said brushes being disposed
in yielding contacting relationship with a conductor ring for
providing electrical continuity therewith when the plug element is
housed within the socket element.
2. A coupling as called for in claim 1, wherein that portion of
each of said brush receiving channels are defined by a pair of
spaced, co-planar surfaces one each on opposite sides of the
channel opening into the said bore, and wherein the pairs of
coplanar surfaces of each of said channels are disposed in axial
alignment.
3. A coupling as called for in claim 2, wherein the plug contact
portion of each brush engages the spaced, coplanar surface areas of
a corresponding brush-receiving channel and spans the bore between
said surfaces.
4. A coupling as called for in claim 1, wherein each brush is in
series circuit with an electrically isolated conductor disposed in
the said conductor-receptive channel.
5. An electrical coupling as called for in claim 1, wherein the
plug element includes an outer substantially cylindrical surface
defined by alternate non-conductive areas between adjacent
conductor rings and wherein the outer diameter of the
non-conductive areas conforms substantially to the outer diameter
of said conductor rings, providing an overall, uniform, continuous
outer surface.
6. A coupling as recited in claim 1, wherein each conductor ring is
in series circuit with an electrically isolated conductor, and
wherein each conductor is embedded within the interior of the plug
element.
7. A coupling as called for in claim 1, wherein the means engaging
the outer surface of the brush holder comprises a sleeve which
substantially encases the brush holder and maintains said brushes
and conductors in their respective brush-retaining and
conductor-receptive channels.
8. A coupling as called for in claim 1, in combination with a pair
of bodies pivotally interconnected for movement about a common axis
of rotation, wherein there is provided means for securing said plug
element relative to one of said bodies and in axial alignment with
its said axis of rotation, and means for securing said socket
element relative to the other of said bodies and in axial alignment
with its said axis of rotation.
9. A combination as called for in claim 8, wherein one of said
bodies includes a cylindrical hinge pin and the other of said
bodies includes a hollow hinge-pin-receptive sleeve for providing
pivotal connection between said bodies when the hinge pin is housed
within the said hinge pin receptive socket.
10. A combination as called for in claim 9, wherein said plug
element is secured to and is in substantial axial alignment with
the said hinge pin and wherein said socket element is contained
within and in substantial axial alignment with said hinge pin
receptive socket.
11. A combination as called for in claim 8, wherein each of said
bodies comprises a hinge leaf.
12. A combination as called for in claim 11, wherein each hinge
leaf includes a bearing surface which limits the relative axial
movement between the hinge pin of one leaf and the hinge pin
receptive socket of the other leaf.
13. A combination as called for in claim 12, wherein the conductor
rings of the plug element comprise continuous peripheral surfaces
which provide continuous electrical continuity with the conductor
brushes of the socket element for all pivotal positions of the
hinge leaves.
14. A combination as called for in claim 12, wherein one or more of
the conductor rings of the plug element comprise discontinuous
peripheral surfaces which provide selective electrical continuity
and discontinuity with the conductor brushes of the socket element
for different pivotal positions of the hinge leaves.
15. A multi-electrical-circuit conductive hinge of the type which
includes a pair of hinge leaves, one of which leaves includes a
hinge pin having an outer terminal end, the other of said leaves
including a hinge-pin receptive socket, a slip ring assembly
secured to, carried by and projecting axially from the terminal end
of the hinge pin, a conductor brush assembly housed within the said
hinge-pin receptive socket, said slip ring assembly including
conductor rings which are disposed in contacting relationship with
the brushes of the conductor brush assembly for providing
electrical continuity therebetween when the hinge pin is fully
housed within the hinge-pin receptive socket.
16. A hinge as called for in claim 15, wherein a surface of each of
the hinge leaves is provided with conductor-receptive channels,
wherein conductors from each of the conductor rings of the slip
ring assembly are disposed within the conductor-receptive channels
of the hinge leaf which includes the hinge-pin, and wherein
conductors from each of the brushes of the conductor brush assembly
are disposed within the conductor-receptive channels of the hinge
leaf which includes the hinge-pin receptive socket.
17. A hinge as called for in claim 15, wherein the overall length
of the hinge pin and slip ring assembly projecting therefrom are
adapted to be received within the hinge-pin receptive socket.
18. A hinge as called for in claim 17, wherein the slip ring
assembly is secured to the terminal end of the hinge pin for
relative lateral movement therewith.
Description
BACKGROUND OF THE INVENTION
While electrical slip couplings are not novel, per se, none of the
prior art devices provide couplings that are adapted to be
repeatedly coupled and uncoupled without the requirement of special
tools or skilled labor, or without requiring at least a partial
disassembly of one or more of the elements which collectively
constitute the assembly.
A primary object of the present invention is to achieve a rotary
coupling which will provide electrical continuity between circuits
contained in elements disposed in rotational or pivotal
relationship while ensuring the easy and frequent coupling and/or
uncoupling of the slip ring assembly and brush holder assembly
without impairing the electrical continuity therebetween when said
assemblies are in coupled relationship.
It is further an object of the invention to provide an electrical
slip coupling that may be used in combination with a pair of
pivotally mounted elements, for example, a hinge assembly, without
requiring alteration in the design of the elements and without
requiring special tools or skilled labor to assemble and
disassemble the combination.
DESCRIPTION OF THE PRIOR ART
U.S. Pat. No. 3,185,951 discloses a slip ring assembly which
comprises a rotor element 11, opposite ends of which are journalled
for rotation within and relative to a multi-element outer housing
12. The rotor element is provided with a plurality of integrally
formed flanges 17 which define the side limits of each of a
plurality of metallic slip rings 14. An individual brush 30 is
provided for each slip ring wherein each brush comprises a pair of
parallel legs 31, 32, which are adapted to engage opposite sides of
a slip ring 14. The brushes are secured to and carried by an insert
29 which, as clearly illustrated in FIGS. 2 and 3, is secured to
and carried by the upper half 25 of the two piece housing 12, the
other portion of said housing being indicated by the numeral 26.
The structural details of the assembly are such as to preclude
withdrawal of the rotor unit 1 without completely disassembling the
unit.
U.S. Pat. No. 3,564,168 discloses a slip ring assembly which
includes a core member, the outer surface of which is suitably
grooved for containing a loop of wire 34 which constitutes an
individual slip ring (see FIG. 4), and an outer housing is provided
with a plurality of laterally spaced brush members 44 (note FIGS.
2, 4, and 4A) which are adapted to engage the outer surface of a
corresponding slip ring. The "locking" relationship between brush
members 44 and the grooves (32) in which the slip rings are located
preclude endwise withdrawal of the core member 14.
U.S. Pat. No. 3,297,973 discloses a miniaturized slip ring assembly
comprising an inner member 12, the outer surface of which is
provided with a plurality of pairs of grooves each containing a
slip-ring 34. As best illustrated in FIGS. 3 and 4, wires 16 are
adapted to be received in said grooves to contact the slip rings
34, wherein the upper ends of the wires 16 are loosely secured to
and carried by a conducting sleeve 28 carried by outer housing or
insulating cylinder 32. Although the specification of this patent
reference is to the fact that the assembly can be "disassociated"
for cleaning, it would appear that the manner in which wires 16 are
disposed within the slip ring grooves would seriously impair the
free assembly and disassembly of the device.
U.S. Pat. No. 3,243,866 discloses a method of constructing an
elongate plug-type miniature slip-ring assembly.
None of the aforesaid patents disclose or suggest an electrical
rotary coupling of the type which comprises elongate plug and
socket elements which are adapted to be freely and repeatedly
coupled and uncoupled without impairing electrical continuity
between said elements when coupled.
A search of the prior art for electrically conductive hinge
assemblies revealed the existence of U.S. Pat. No. 3,355,695 which
discloses a hinge having means for providing one or more
slip-ring-type circuits in conjunction with the barrel portion of a
hinge, such as found in automotive vehicles. An electrical path is
provided by the structure illustrated in FIGS. 3, 4, and 5 by means
of hinge leaf 31 and 32 which are securely, though movably
interconnected by means of a grommet 35.
U.S. Pat. No. 1,744,040 discloses a hinge structure having means
for establishing an electrical circuit between a pair of hinge
plates 10 and 11, by means of a hinge pin 42 having conductive
portions 18 and 19 which are adapted to engage and electrically
interconnect sockets 14 and 15 of the hinge pin receptive portions
of plates 10 and 11.
No prior art was located which disclosed a hinge construction which
included a slip ring assembly in the form of an elongate plug
element secured to, carried by and projecting axially from a hinge
pin for the free insertion into and/or withdrawal from a brush
holder assembly in the form of an elongate socket member housed
within the hing-pin-receptive socket of a hinge assembly, for
enabling a plurality of electrical circuits to be established
between the hinge leaves when in assembled, cooperating
relationship.
SUMMARY OF THE INVENTION
The present invention relates generally to the class of electrical
couplings referred to as rotary couplings, floating brush
assemblies or electrical slip couplings, that is, couplings
providing electrical continuity between two rotationally or
pivotally disposed elements.
The device of the present invention comprises an elongate plug
constituting slip ring assembly containing a plurality of laterally
spaced conductor rings separated by non-conductive regions and an
elongate unitary socket consituting a brush holder assembly for
rotationally receiving the plug, the socket containing a plurality
of conductor brushes, wherein insertion of the plug into the
receptive socket provides electrical continuity between conductor
rings and conductor brushes. Electrical connectors are carried in
each assembly and coupled to the conductor elements to provide easy
access of the coupling components to an external electrical
circuit.
The slip ring assembly includes a smooth continuous outer surface
having alternative conducting and non-conducting regions, the
assembly being insertable in the brush holder assembly without
longitudinal or rotational restriction. The slip ring assembly may
likewise be freely withdrawn from the brush holder. The electrical
slip coupling may, therefore, be used in combination with a pair of
rotationally disposed elements, such as a hinge assembly, without
requiring special tools or skilled labor to assemble and
disassemble the hinge components.
While a detailed description of exemplary embodiments is contained
in the drawings and following description, it is to be understood
that modifications may be made in structural details here shown and
described within the scope of the appended claims without departing
or exceeding from the spirit and scope of the invention.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded view illustrating the relationship of the
various components which collectively comprise an electrical slip
coupling which embodies the teachings of the invention.
FIG. 2 is a view of the assembled electrical slip coupling, partly
in section, for clarity of detail and understanding.
FIG. 3 is a sectional view taken along line 3--3 of FIG. 2.
FIG. 4 is a view similar to FIG. 3, illustrating a modification
thereof.
FIG. 5 is an end view of the elongate plug or electrical slip ring
assembly of FIG. 1.
FIG. 6 is a perspective view of a hinge assembly which is provided
with the slip coupling of FIG. 1.
FIG. 7 is an enlarged fragmentary view of the hinge assembly of
FIG. 6 shown partially in section for clarity of detail and
understanding.
FIG. 8 is an exploded view illustrating the relationship of the
various components of the hinge assembly in combination with the
components of the electrical slip coupling.
FIG. 9 is an exploded view of the hinge assembly of FIG. 6, with
the hinge halves or plates in a disconnected relationship.
DETAILED DESCRIPTION
The structural details of the electrical slip coupling of the
present invention are illustrated in FIGS. 1-5 of the drawings,
whereas FIGS. 6-9 illustrate utilization of the coupling in
combination with a typical hinge assembly.
FIG. 1 is an exploded view of the various components of the
electrical slip coupling. The plug or slip ring assembly denoted
generally by the numeral 10 comprises an elongate cylindrical
member 12 of a non-conductive material having a plurality of
conductor rings 14-17 separated by non-conductive regions 18. The
slip ring assembly is designed to be inserted in the central bore
20 (see FIG. 2) of the housing 22 of the brush holder assembly or
socket denoted generally as 24. Housing 22 contains a plurality of
peripheral channels 26 providing suitable seats for conductor
brushes 27-30. Each peripheral channel contains a spaced planar
surface area 32 formed by a chord sector. The spaced planar surface
areas 32 are in open communication with bore 20 to provide exposure
of or free access to conductor rings 14-17 when the slip ring
assembly 10 is inserted within the housing 22. Each of the brushes
27-30 include a contact projection 33 which is designed to be
seated in the planar surface region 32 of a corresponding
peripheral channel 26. When brushes 27-30 are seated in channels 26
and the slip ring assembly 10 is inserted in bore 20 each of the
conductor brushes will be in contact with its respective conductor
ring. In the embodiment illustrated, the projecting surface 33 of
brush 27 will bear against conductor ring 14; likewise, brush 28
with respect to ring 15, brush 29 with respect to ring 16, and
brush 30 with respect to ring 17. Thus, electrical continuity is
provided between slip ring assembly 10 and brush holder assembly
24.
Brushes 27-30 are fabricated from any suitable spring like material
such as strip, beryllium copper, for example, thus establishing a
yielding contacting relationship with the conductor rings 14-17 and
allowing free rotation of the various components when assembled. A
sleeve 34 embraces housing 22 to encase the housing and maintain
the brushes in proper relationship with their respective channels
26.
Electrical connectors 36a-39 a (which are collectively designated
by the letter A) are suitably secured at 40 one each to a
corresponding brush 27-30. Each connector is insulated by a typical
wrapper 42 to ensure electrical isolation of the various brush
elements. Connectors A are carried within the brush holder assembly
in a suitable channel 44 extending the length of housing 22. Thus,
when sleeve 34 embraces housing 22, all of the components of the
brush holder assembly are encased, forming a single, unitary
coupling component. Connectors A extend beyond end 46 of the brush
holder assembly to provide easy access to external electric
circuitry. The brush holder assembly is easily assembled and
disassembled by simply removing the outer sleeve 34 to expose
housing 22. If desired, an adhesive substance may be applied to
interior 48 of the sleeve thus securing the sleeve to peripheral
surface 50 of the housing, sealing the brush holder assembly in a
compact, unitary package.
Electrical connectors 36b-39b (which are collectively designated by
the letter B) are secured one each to a corresponding slip ring
14-17 at 52, shown particulary in FIG. 2. As with connectors A, the
connectors B are each suitably insulated by a typical wrapper 42.
Connectors B are carried within the elongate member 12 and extend
beyond end 54 to provide easy access to external electrical
circuitry.
When slip ring assembly or plug 10 is inserted in brush holder
assembly or socket 24 electrical continuity is established between
connectors A and B. For example, wire 36a establishes electrical
continuity with wire 36b through the yielding contacting
relationship between slip ring 14 and conductor brush 27, likewise
wires 37a and 37b through brush 28 and conductor ring 15, 38a and
38b through brush 29 and conductor ring 16, and 39a and 39b through
brush 30 and conductor ring 17. It is often desirable to identify
the complementary connectors or wires by uniquely coloring each
wrapper 42 of the various complementary connector pairs.
The slip ring assembly 10 may be made in any suitable manner. One
suitable method comprises the placement of the conductor rings
14-17 and attached connectors B in proper relationship within a
mold and molding or vacuum casting a plastic non-conductive
material thereabout to provide elongate member 12 and generate the
assembled slip ring assembly 10. It is possible to provide a smooth
continuous outer peripheral surface on the elongate member 12 by
removing the excess plastic from the assembly, generating a surface
wherein the outer diameter of the rings 14-17 is substantially
equal to the diameter of the non-conductive regions 18. Providing
the slip ring assembly with a smooth, continuous peripheral surface
permits unrestricted longitudinal as well as rotational movement
between central bore 20 of housing 22 and elongate member 12. To
enhance this feature, taper end portion 56 is provided at leading
end 58 of the elongate member to lift contact projections 33 as the
elongate member enters bore 20. Thus, the slip ring assembly
provides an outer, substantially cylindrical surface defined by
non-conductive areas between adjacent conductor rings with the
outer diameter of the non-conductive areas conforming substantially
to the outer diameter of the conductor rings to provide an overall
uniform and continuous outer surface.
When slip ring assembly 10 and brush holder assembly 24 are
constructed in this manner, they form a suitable plug and socket
assembly wherein the entire slip ring assembly may be inserted
and/or withdrawn from the brush holder assembly without use of
special tools or skilled labor, or without disassembly of any of
the various components of the electrical slip coupling, that is
without the disassembly of either the brush holder assembly or the
slip ring assembly.
It is often desirable to include an enlarged base portion 60 on the
tail end 54 of elongate member 12. This permits attachment of the
slip ring assembly to a rotating external member containing
electrical circuitry. While base portion 60 may be of any suitable
configuration, permitting easy attachment of the slip ring assembly
to an external element, the flat portions 62 contained in the
illustrated embodiment permit lateral movement of the slip ring
assembly with respect to the center line C.sub.L of the electrical
slip coupling assembly while insuring rotational engagement with
the external element. In this manner, the tolerance to be
maintained between the various components of two bodies held in
rotational relationship need not be as critical as the tolerance to
be maintained in manufacturing the electrical slip coupling to
provide adequate electrical continuity between the various
components of the system.
An alternative embodiment of the slip ring assembly is illustrated
in FIG. 4. FIG. 4 conforms generally to the view illustrated in
FIG. 3, however, the continuous slip ring 17 illustrated therein
has been replaced by a split slip ring 64 separated by a pair of
ends 66 and 68 to form a C-shaped element. The non-conducting
material comprising the elongate element 12 extends beyond the slip
ring 64 to form a non-conductive area 70 between the spaced ends 66
and 68. The non-conducting area 70 has an outer surface conforming
substantially with the overall outer peripheral surface of the
elongate member 12 to provide a smooth and continuous surface on
the slip ring assembly 10 for easy insertion into bore 20. By
introducing the split ring 64, continuous electrical continuity is
replaced with selective electrical continuity and discontinuity.
For example, as the ring 64 rotates in the direction of arrow 72,
the electrical slip coupling will conduct when contact portion 33
is in communication with the slip ring 64, and will not conduct
when contact projection 33 is bearing against the non-conductive
region 70. It should be understood that any split ring
configuration could be utilized, producing any desired pattern of
electrical continuity and discontinuity without departing from the
invention as herein described. It should be further understood that
split rings and continuous rings can be used alternatively or in
any suitable order to provide the desired electrical continuity and
discontinuity between rotationally mounted elements containing
electrical circuitry.
FIGS. 6-9 illustrate a typical hinge assembly in combination with
the electrical slip coupling of the present invention. The hinge
assembly includes two hinge halves or leaves 74 and 76 each adapted
to be secured via mounting holes 78 to an element designed to be
disposed in rotational relationship with another element. While the
hinge assembly here shown includes one leaf 74 having a hinge pin
80 adapted to be received by sleeve or socket 82 of the other hinge
leaf 76, see particularly FIG. 8, it should be understood that the
combination could include any suitable hinge assembly or pair of
rotationally disposed elements.
Brush holder assembly 24 is attached to one of the rotational
elements and substantially in coaxial relationship therewith, and
slip ring assembly 10 is attached likewise to the other element to
provide electrical continuity between elements upon their proper
assembly. In the illustrated embodiment, the brush holder assembly
24 may be inserted in socket 82, with slip ring assembly 10 being
attached to the end portion 84 of pin 80. As shown in FIG. 7, when
the two leaves 74 and 76 are assembled, the slip ring assembly 10
is properly inserted within the brush holder assembly 24 to provide
electrical continuity between the hinge leaves.
The base portion 60 of the slip ring assembly contains flat
surfaces 62 to provide limited lateral movement between the hinge
pin 80 and slip ring assembly 10, thus ensuring proper alignment of
the slip coupling components when the hinge is assembled. A
complementary slot 86 is supplied in the end 84 of hinge pin 80 for
this purpose. Thus the slip ring assembly 10 is free to move
laterally with respect to the center axis of hinge pin 80 while
engaged rotationally therewith.
Groove 88 milled or otherwise provided in surface 90 of hinge plate
76 is adapted to receive wires A of brush holder assembly 24, said
groove being in open communication with open recess 92 at the upper
or closed end of socket 82. Connectors or wires A extend through
the end of the brush holder assembly 24 and are carried by the
recess 92 and grooves 88 to external electric circuitry in the
element to which the hinge plate 76 is secured. Likewise, groove 94
is provided in surface 96 of hinge plate 74 to receive wires B of
slip ring assembly 10, said groove being in open communication with
open recess 98 in the lower or secured end 100 of pin 80. A central
bore 99 is provided in pin 80, having open ends in communication
with slot 84 and recess 98 for carrying connectors B extending
through end 54 of the slip ring assembly, see FIG. 7. An adhesive
substance 102 is then inserted in each recess 92 and 98 to hold the
electrical slip coupling components in place with respect to their
respective hinge leaves. When the hinged leaves are assembled as
shown in FIGS. 6 and 7, it is desirable to provide clearance
between the leading end 58 of the slip ring assembly and the
interior end wall 104 of bore 20. This is to ensure that the weight
of the hinged elements is borne by the hinge assembly and not by
the electrical slip coupling. For this reason, each of the hinge
halves 74 and 76 contains bearing surfaces contacting one another
when hinge halves are properly assembled. The bearing surface 106
of hinge leaf 76 slidably bears against the surface 108 of leaf 74
when the leaves are assembled as shown in FIG. 7. Due to the
unrestricted endwise longitudinal relationship as well as the
unrestricted rotational relationship of the electrical slip
coupling, it is possible to assemble and disassemble the hinge
halves with ease and efficiency, without requiring special tools or
skilled labor.
When the electrical slip coupling has been properly combined with
the hinge components, electrical circuitry may be attached to
connectors A and B. When the continuous slip conductor rings 14-17
are utilized, continuous electrical continuity is provided, while
use of the split ring 64, shown in FIG. 4, permits predetermined
selective continuity and discontinuity between hinge halves during
rotation. By using a suitable adhesive 102 it is possible to remove
and replace the components of the electrical slip coupling without
special tools or skilled labor. Thus, the present invention
provides a simple and efficient electrical slip coupling for
ensuring electrical continuity between two rotationally disposed
elements which may be easily assembled and disassembled without
impairing the electrical conductive properties of the various
components of the combination.
* * * * *