U.S. patent number 3,733,577 [Application Number 05/115,475] was granted by the patent office on 1973-05-15 for electrical two-part connectors.
This patent grant is currently assigned to The Bunker-Ramo Corporation. Invention is credited to Peter George Henry Hammond.
United States Patent |
3,733,577 |
Hammond |
May 15, 1973 |
ELECTRICAL TWO-PART CONNECTORS
Abstract
An improved two-part connector of which one part has one or more
bayonet pins while the other part is fitted with a coupling ring
adapted to telescope over the one part. The coupling ring has an
internal annular groove which receives an annular spring strip in
the form of a band having one or more pairs of spring jaws facing
forwardly of the coupling ring, the spring jaws being adapted to
snap over the bayonet pin or pins of the one part when the two
parts are mated.
Inventors: |
Hammond; Peter George Henry
(Whitstable, EN) |
Assignee: |
The Bunker-Ramo Corporation
(Oak Brook, IL)
|
Family
ID: |
26241353 |
Appl.
No.: |
05/115,475 |
Filed: |
February 16, 1971 |
Foreign Application Priority Data
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Feb 16, 1970 [GB] |
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7,332/70 |
Nov 20, 1970 [GB] |
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55,380/70 |
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Current U.S.
Class: |
439/357; 285/305;
24/630; 285/921 |
Current CPC
Class: |
H01R
13/6278 (20130101); Y10T 24/45607 (20150115); Y10S
285/921 (20130101) |
Current International
Class: |
H01R
13/627 (20060101); H01r 013/54 () |
Field of
Search: |
;339/69,70,73,74,76-79,90,91 ;285/DIG.22,305,317,319,404
;287/DIG.7,119 ;24/201,23R |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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1,045,762 |
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Jul 1953 |
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FR |
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481,485 |
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Dec 1969 |
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CH |
|
Primary Examiner: McGlynn; Joseph H.
Claims
What we claim is:
1. A first connector part for receiving a mating second connector
part having at least one radially directed projection thereon, said
first part comprising a cylindrical body and a coupling ring
coaxial with and rotatable on said body, said coupling ring
enclosing at least one pair of axially extending jaws adapted to
receive and retain said projection when said first and second
connector parts are brought together, said coupling ring having an
annular forward portion which provides a shroud for said jaws, and
at least one aperture in said forward portion through which said
projection is observable when said connector parts are brought
together.
2. A first connector part for receiving a mating second connector
part having at least one radially directed projection thereon, said
first part comprising a cylindrical body, a coupling ring carried
thereon and coaxial therewith, having an annular internal groove,
intersected by at least one axial internal groove extending from
said annular groove to the outer end of said coupling ring, and a
spring received in said groove, said spring having at least one
axially-opening jaw thereon adapted to receive and retain said
radially directed projection when said connector parts are mated,
said jaw being received in said axial groove.
3. The invention as defined in claim 2, wherein the spring is of
normal curvature less than that of said groove, so that when fitted
therein it exerts outward force.
4. The invention as defined in claim 2, wherein said jaw consists
of a pair of opposed members defining a flared mouth with its large
end toward the outer end of said coupling ring, and its smaller end
opening into a first aperture of interrupted circular outline
larger than said projection.
5. The invention as defined in claim 4, wherein said coupling ring
includes a second aperture radially aligned with said first
aperture, through which said projection is observable when said
connector parts are brought together.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The field of art to which the present invention pertains is that of
electrical two-part connectors of the type in which the two mating
parts of the connector are maintained in a mating locked position
by a snap or snatching action when the mating parts are
connected.
2. Description of the Prior Art
One common form of known electrical two-part connector has one or
more bayonet pins on a male connector plug body and a coupling ring
rotatable on a mating female receptacle body, the coupling ring
having bayonet slots therein corresponding to the bayonet pins on
the plug body. The two parts are drawn together when the coupling
ring is rotated to cause the pin to ride up the slots of the
coupling ring. Such a connector requires the coupling ring to be
rotated in the opposite direction to effect disconnection of the
parts. Requirements exist, however, for connectors which will
disconnect simply in response to a pull, such connectors being
designated in the art as snatch connectors.
Many designs for snatch connectors exist, of varying degrees of
complexity, but all have distinguishable disadvantages, in that
generally they are quite complex and thus difficult to manufacture,
and generally are not suitable for mating with corresponding mating
connectors already implemented in existing equipment systems.
SUMMARY OF THE INVENTION
In view of the need in the art of a simple snatch type connector,
but yet one which can easily be adapted to present manufacturing
equipment and be relatively compatible with existing mating
connectors, it is an object of the present invention to provide an
electrical two-part connector which is simple in construction but
which is nevertheless structured so as to require only minor
manufacturing modifications of conventional bayonet type connectors
to be compatible therewith. This enables the manufacturer of a
variety of bayonet connectors to supply the same selection or range
of connector types to his customers in the alternative snatch
connector version, with only small additional tooling costs and
stock-carrying requirements.
According to the present invention, there is provided an electrical
two-part connector of which one part has one or more bayonet pins,
while the other part is fitted with a coupling ring adapted to
telescope over the one part, the coupling ring having one or more
pairs of spring jaws fitted therein or integral therewith and
facing forwardly of the open end of the coupling ring so as to snap
over the bayonet pin or pins when the two parts are mated.
It will be appreciated that the male plug body portion of the
connector, carrying the bayonet pins is of the type presently being
used with conventional bayonet type connectors and accordingly
requires no modification whatsoever. The female receptacle body may
also be manufactured without change or modification provided that
the conventional coupling ring rotatable thereon be replaced with a
coupling ring in accordance with the present invention, in order to
change a conventional bayonet connector into a snatch-type
connector.
The pairs of spring jaws in a preferred embodiment of the invention
are arranged on a length of resilient band formed of either a
synthetic material or metal which is bent into an annular form,
inserted into the forward end of the coupling ring, and maintained
therein by the resilient biasing force it exerts on the inner
surface of the coupling ring.
It will be particularly noted that conventional bayonet connectors
are normally constructed to create a certain mating pressure
between the connector parts when the coupling ring is rotated on
the bayonet pins to the coupled position. The snatch connector of
the present invention, on the other hand, is arranged so as to
establish a mating pressure by arranging the spring jaws of the
coupling ring to grip the bayonet pin or pins of the plug body,
thereby tending to draw the plug body into the open end of the
coupling ring. Thus, while major portions of the connector (both
male and female) are constructed of presently available parts, the
unique action of the coupling ring and spring jaws of the subject
invention result in a significantly different and improved means of
drawing the two parts of the connector together.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail, by way of example,
with reference to the figures of the accompanying drawings, in
which:
FIG. 1 is a view of a coupling ring in axial cross-section and the
plug body and receptacle body in vertical elevation;
FIG. 2 is a view of the structure comprising the pairs of spring
jaws prior to flexing of the spring to fit internally of the
coupling ring; and
FIG. 3 is a fragmentary view of a single spring jaw pair showing
one pin in the snatched position within the jaw.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGS. 1 and 2, the two principal parts of the two-part
connector are shown as male body plug 10 and female receptacle body
16. The plug body 10 houses socket contacts, one of which is
indicated schematically at 12. The body 10 has three bayonet pins
14 projecting radially therefrom at 120.degree. intervals.
The receptacle body 16 comprises pin contacts, one being shown
schematically at 18, which mate and electrically contact
corresponding ones of the socket contacts 12 of the plug body 10
when the two parts are joined.
The pin contacts 18 are shrouded within the forward end 20 of a
coupling ring 22 which is rotatably mounted on the receptacle body
16, e.g., by means of a circlip (not shown) engaging in an annular
groove 24 inside the ring 22.
As viewed externally of the connector, the coupling ring has the
appearance not unlike an ordinary bayonet coupling ring, with the
exception that the conventional bayonet slots are not formed on the
forward end 20 of the ring 22, as in prior art connectors. Instead,
the forward end 20 is relieved internally so as to form an annular
groove 26 which opens forwardly at 120.degree. intervals, forming
wide slots 28 on the inner front surface of the coupling ring 22.
The slots 28 are of such dimension as to leave projections or lands
30 between the slots 28 of even greater width than the slots
28.
The lands 30 serve to retain a spring strip in the forward end 20
of the ring 22, the strip being formed of a length of tough
resilient synthetic material, or of a metal if preferred, which is
bent into a circle and sprung into the forward end 20. The spring
strip comprises a band 32 which enters the groove 26 and is
prevented from being pulled out axially by the spring strip
abutting the walls of the groove 26 and is prevented from rotation
in the ring 22 by the spring strip abutting the walls of the slots
28. In the preferred embodiment, three pairs of jaws 34 project
forwardly from the band 32 through the slots 28.
Each pair of jaws 34 has a flared mouth 36 into which one of the
bayonet pins 14 can be pushed to spread the jaws apart. The smaller
dimensioned end of the mouth 36 opens into a circular aperture 38.
When the pins 14 enter the apertures 38, the jaws snap together
again and hold the two parts of the connector together until a
sufficient pull separates the two parts. The required pull or
separating force can be established by selectively designing the
jaws 34 to suit the particular application contemplated.
The ring 22 is drilled with three radially directed holes 40
through which the pins 14 can be seen when the pins 14 are fully
home in the apertures 38.
As indicated earlier, the snatch connector of the present invention
is arranged to establish a mating pressure between the two
connector parts by designing the spring jaws 34 of the band 32 so
as to grip the bayonet pin or pins, thereby tending to draw the
same into the coupling ring 22. When the pins 14 are snapped into
the circular apertures 38, they are thus not loose therein. Rather,
the pins are gripped by the shoulders 42 formed where the apertures
38 meet with the flared mouth portion 36 of the jaws 34. These
shoulders direct forces against the pin 14 that are directed
axially inwardly with respect to the forward end 20 of the coupling
ring 22, and therefore act against the cylindrically-shaped pin 14
to cam the pin into the coupling ring. Utilizing a suitable design
for the dimensions between the ends of the connector bodies 10 and
16, together with the respective dimensions of the pin 14 and the
apertures 38, a mating pressure is established between the plug
body 10 and the receptacle body 16 when the pin is under camming
pressure. The camming action between the shoulders 42 and pin 14 is
illustrated in FIG. 3, which shows a fragmentary portion of the
band 32, one of the pair of jaws 34 having captured a pin 14 which
had been forced between the jaws 34 through the flared mouth 36 and
into the FIG. 3 position within aperture 38.
In the FIG. 3 position, the shoulders 42 exert force in the
direction of arrows 43 as the jaws 34 spring together. As the
shoulders 42 cam against the pin 14, a component of force in the
direction of arrows 44 is also generated. In this manner, while the
pin 14 is, as shown in FIG. 3, somewhat smaller in diameter than
aperture 38, the pin 14 is not loosely fitted within the aperture
in the coupled position of the connector.
The connector parts are designed to separate in response to a
direct pull on the cables which are connected by the connector.
However, the recommended manner of separating the two parts is to
provide a direct pull while grasping the two parts in the hands of
the user. The person attempting to disconnect the two parts may not
realize initially that he is handling a snatch connector instead of
a bayonet connector, and may therefore attempt to rotate the
coupling ring 22 relative to the plug body 10. This inadvertent
act, however, will not cause any damage to the connector because
the jaws 34 of the spring strip will merely be pushed against the
lands 30 and cannot be forced beyond such a position.
The use of a spring strip sprung into a coupling ring enables the
production of a coupling ring having a conventional external
appearance, e.g., a narrowed metal ring, while the particular
structure internally thereof provides the convenience and speed of
connecting and disconnecting which is associated with snatch-type
connectors. Thus, the advantages of a snatch-type connector is
realizable concomitant with being simple and inexpensively
produced.
It is contemplated that the jaws 34 could be provided using various
manufacturing techniques. As an example, the ring 22 could be
molded from a tough, resilient synthetic material, the jaws being
molded integrally therewith. Alternatively, the coupling ring could
be produced from metallic material and the band 32 could be
produced from synthetic material and/or from a sheet metal material
by stamping operations.
Since the receptacle body 16 is intended to be adapted with the
unique coupling ring in accordance with the present invention, the
body members 10 and 16 are considered to be parts which are
presently available on the market. Thus, the present invention is
related specifically to the coupling ring 22 and the band 32
mounted therein. The coupling ring 22 and band 32 can be sold
separately, e.g., as an adaptor which the user can fit onto
existing connectors as a replacement for their ordinary bayonet
coupling rings, thereby effecting conversion of the connector to a
snatch-type connector.
With specific reference to FIG. 2, it will be seen that the
coupling ring and spring jaws are manufacturable with the band 32
having generally straight portion 33 with the three pairs of jaws
34 projecting laterally therefrom. In use, this strip is bent into
a circle and snapped into the coupling ring. As shown in FIGS. 2
and 3, the jaws preferably have a mouth 36 which is flared and
tapers inwardly toward the straight part 33 of the band 32 and then
opens into an enlarged aperture 38 for receiving the bayonet pin
14.
It will be apparent that the spring strip insert band 32 can easily
be pried out of the coupling ring 22 and a new band snapped into
place, if replacement is needed for any reason. It will also be
noted that the form of the band 32, with relatively short jaws 34,
will allow the band to be accommodated in the coupling ring 22
without increasing either its axial or its radial dimensions beyond
that of conventional bayonet type connectors. Externally, the
coupling ring can be identical with the ordinary bayonet coupling
ring which it replaces.
When the connection is made or broken, the jaws 34 flex open by the
action of the jaws 34 bowing and twisting to accommodate the pin
14. Pin 14 is designed to be of larger diameter than the smallest
dimension of the flared mouth 36 but of smaller diameter than the
aperture 38. The twisting character of the jaws 34 is particularly
effected at the roots of the jaws where they merge into the
straight portion 33 of the band 32. However, it will be appreciated
that the band itself may bow or twist laterally in the narrowed
region thereof adjacent the aperture 38. In order to permit
twisting of the straight portion 33 of the band 32 itself, the
axial width of the band 32 may be designed to be somewhat less than
the axial width of the annular groove 26 which receives the band
32.
While the invention has been particularly shown and described with
reference to a preferred embodiment thereof, it will be understood
by those skilled in the art that the foregoing is an example only,
and that other changes in form and detail may be made therein
without departing from the spirit and scope of the invention.
* * * * *