U.S. patent number 3,792,418 [Application Number 05/177,730] was granted by the patent office on 1974-02-12 for electrical connector.
This patent grant is currently assigned to Bunker-Ramo Corporation. Invention is credited to William A. Kailus.
United States Patent |
3,792,418 |
Kailus |
February 12, 1974 |
ELECTRICAL CONNECTOR
Abstract
A high-temperature electrical connector including
interengageable mating sections each having a central and an
outer-tubular metallic contact and an insulating sleeve disposed
therebetween with the insulating sleeve of the one section having
self-lubricating surfaces of a fluorocarbon engaging the sleeve or
its associated outer-tubular metallic contact of the other section,
the fluorocarbon having a relatively low heat deflection
temperature so as to deform at high temperatures. The other
insulating sleeve is composed of a material such as an aromatic
polysulfone with a relatively high heat deflection temperature to
provide a relatively rigid support for the fluorocarbon sleeve.
Inventors: |
Kailus; William A. (North
Riverside, IL) |
Assignee: |
Bunker-Ramo Corporation (Oak
Brook, IL)
|
Family
ID: |
26873586 |
Appl.
No.: |
05/177,730 |
Filed: |
September 3, 1971 |
Current U.S.
Class: |
439/578;
439/607.01; 439/933 |
Current CPC
Class: |
H01R
24/40 (20130101); Y10S 439/933 (20130101); H01R
31/02 (20130101); H01R 2103/00 (20130101) |
Current International
Class: |
H01R
13/00 (20060101); H01R 13/646 (20060101); H01R
31/02 (20060101); H01R 31/00 (20060101); H01r
017/06 () |
Field of
Search: |
;339/60,61,89C,9C,91P,94R,94C,94M,126J,136C,177R,177E,278D
;174/75C,88C,89 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
57,453 |
|
Jul 1952 |
|
FR |
|
1,168,745 |
|
Dec 1958 |
|
FR |
|
1,929,846 |
|
Dec 1970 |
|
DT |
|
Other References
The Condensed Chemical Dictionary, 8th Ed., July 6, 1971, pages 712
& 713..
|
Primary Examiner: Champion; Marvin A.
Assistant Examiner: Staab; Lawrence J.
Attorney, Agent or Firm: Arbuckle; F. M. Lohff; W.
Claims
I claim:
1. An electrical connector comprising first and second
interengageable mating sections, each including at least one
central metallic contact and outer protective longitudinally
elongated sleeve therefor, the sleeve of the first section being
composed of a self-lubricating fluorocarbon having a heat
deflection temperature below about 300.degree. F. at 66 psi and
having a mating end with an inwardly projecting lateral riser sized
to telescope over and engage the sleeve of the second section with
said mating end except for said riser being sized so as to be
spaced apart from the second sleeve to permit release of the
sleeves, the second sleeve having a mating end with a periphery of
an essentially constant cross-sectional dimension along the
longitudinal axis for engagement with said riser and being composed
of a material having a heat deflection temperature above about
400.degree. F. at 264 psi, the riser bearing against said periphery
with a laterally directed force when said sections and sleeves are
mated.
2. The electrical connector of claim 1 wherein each of said
sections includes a second metallic contact outwardly disposed
about said sleeve as a shield for the central contact with the
shield for one of the central contacts including an inward curve to
form a spring means for engagement with the shield for the other of
said central contacts, and the sleeve of said second section is a
thermoplastic polysulfone.
3. The connector of claim 1 wherein said sleeve with said riser
extends longitudinally beyond said central contact and is laterally
spaced apart therefrom.
4. The electrical connector of claim 3 wherein said second sleeve
is a plastic sleeve disposed around and spaced apart from said
central contact and said plastic is a polysulfone.
5. The electrical connector of claim 4 wherein said riser extends
radially around said mating end for sealing engagement with the
mating end of the sleeve of the second section.
6. The electrical connector of claim 5 wherein said fluorocarbon is
polytetrafluoroethylene.
Description
BACKGROUND OF THE INVENTION
In connectors of the plug-and-receptacle type, interengageable
connector sections are mated to provide electrical connection
between centrally-mounted mating contacts and to interconnect
protective housings surrounding these contacts. In one type of
connector, the housings are composed of insulating materials with
at least one housing being shaped as a sleeve to receive the other
in engaging relationship.
In another type, the housings are metallic to provide electrical
shielding of the central contacts and insulating members are
provided to isolate the central and outer contacts. In one example
of the second type of connector used at elevated temperatures (e.g.
250.degree.-300.degree. F.), one of the insulating members
longitudinally extends as a sleeve between the central and outer
contacts and abuts against the other insulating member rearwardly
located in the connector section.
As the temperature requirements of these connectors have increased,
it has been necessary to provide dielectric materials for the
sleeves which are insulatively stable at the higher temperatures in
addition to having other properties required for connector
housings. Some materials, while insulatively stable at temperatures
of 400.degree.-500.degree. F.,are so rigid that they do not easily
mate; and in those instances where a seal is to be established,
these materials are not sufficiently yieldable to provide sealing
effect.
Another problem associated with some materials insulatively stable
at temperatures of 400.degree.-500.degree. F. is that they tend to
distort at the higher temperatures and this distortion interferes
with the desired mating of the connector sections. In some
instances, it is possible for the mating surfaces of the same
material to lock and resist separation of the sleeves during
attempts to release the connector sections. Among the materials
having heat distortion properties which can result in this problem
are the self-lubricating fluorocarbons and particularly
polytetrafluoroethylene.
SUMMARY
This invention relates to electrical connectors with
interengageable mating sections in which an insulating sleeve on
one of the sections is mated within a complimentary protective
housing on the other section. The sleeve is composed of a
self-lubricating fluorocarbon with a relatively low heat deflection
temperature and thereby heat distortable in a mating relationship
with the complimentary protective housing. More particularly, the
invention is directed to an electrical connector with
interengageable mating sections in which the complimentary
protective housing engageable with the fluorocarbon sleeve is
composed of a material having a relatively high heat deflection
temperature to maintain the mating relationship while permitting
the sections to be released at high temperatures. Exemplary of a
material with such high heat deflection temperatures is an aromatic
polysulfone which is insulatively stable at temperatures of
400.degree.-500.degree. F. and also has a heat deflection
temperature of over 500.degree. F. at 264 psi as measured in ASTM D
648-56.
Several advantages result from the electrical connector of the
invention. One is the utilization of a high temperature,
self-lubricating fluorocarbon as an elongated insulating sleeve in
the connector construction. In addition to its useful
high-temperature properties, the fluorocarbon provides
self-lubricating properties and thereby can be easily inserted
within or over a complimentary protective housing without requiring
the second housing to be similarly self-lubricating. It is also
sufficiently yieldable to form an interference fit with the
complimentary housing.
Another advantage is provided by the combination of the
fluorocarbon sleeve with a complimentary protective housing
composed of a material comparatively rigid at the higher
temperatures. The rigid housing provides a mating surface which
resists distortion and permits release of the connector
sections.
Another advantage is provided by the use of a complimentary
protective housing mateable in an engaging relationship with the
fluorocarbon sleeve and composed of a material having a high heat
deflection temperature to maintain the engaging relationship
without preventing the connector sections from being released.
In those instances where a seal is desired, a further advantage is
provided at the high temperatures when the fluorocarbon sleeve
includes a raised collar which tightly bears against the mating
surface of the rigid complimentary housing. Although the raised
collar is under stress and distorted by the heat, it tends to
conform to the mating surface of the rigid material and maintains
some sealing effect.
DESCRIPTION OF THE DRAWING
In the drawings
FIG. 1 is a side view in cross section of the electrical connector
of the invention.
FIG. 2 is a side view in cross section of a second embodiment of
the connector of the invention.
FIG. 3 is a side view of a third embodiment of the connector of the
invention.
FIG. 4 is a side view partially in cross section of one of the
mating sections of the connector of FIG. 1.
FIG. 5 is a side view partially in cross section of the second
mating section of the connector of FIG. 1.
FIG. 6 is a side view in cross section of a socket contact of FIG.
2.
GENERAL DESCRIPTION
The electrical connector of the invention is designed for high
temperature use and comprises first and second interengageable
mating sections, each with a protective body containing one or a
plurality of contact-receiving bores and contacts mounted therein.
In one mating section, the body includes one or a plurality of
yieldable sleeves extending around the contacts in the bores with
self-lubricating surfaces adapted to easily slide against surfaces
in the other mating section while being insulatively stable at
temperatures in the order of 400.degree.-500.degree. F. The
protective body of the second mating section includes a similar
number of bores and complimentary contacts mounted therein to mate
with those contacts in the first section. Advantageously, the
second protective body provides one or a plurality of insulating
surfaces insulatively stable at the higher temperatures and
relatively rigid to accept the self-lubricating surfaces of the
sleeves and form insulated enclosures around the mated
contacts.
Preferably, the self-lubricating surfaces are composed of a
fluorocarbon such as polytetrafluoroethylene and provide
self-lubrication at temperatures of 400.degree.-500.degree. F.
Since the fluorocarbons with these characteristics tend to be heat
distortable as illustrated by low heat deflection temperatures
(e.g. below about 300.degree. F. at 66 psi as measured in ASTM D
648-56), the adverse effects of heat distortion on the mating
surfaces of the connector are reduced by including as the
complimentary mating surface, a material which is relatively rigid
at the higher temperatures. Advantageously, when the mating is
accompanied by bearing stress on the adjacent surfaces, the
fluorocarbon surface includes a raised portion as a bearing surface
which can be heat distorted while maintaining engagement with the
adjacent surface which can be formed to permit easy release of the
mating sections.
Connectors according to the present invention are applicable to a
wide variety of constructions but in a typical installation will
comprise one or a plurality of pairs of interengageable mating
sections 10 and 12 with mating contacts 14 and 16 made of leaded
copper and centrally mounted in their respective sections.
As illustrated in FIG. 1, first section 10 includes central contact
14 with forward pin 18, rear socket 20, and intermediate
cylindrical portion 21 for mounting the contact in section 10.
Second section 12 includes central contact 16 with forward socket
22, rear pin 23 swagged in a bussing ring 24, and intermediate
irregular surfaces 25 for mounting in section 12. Bussing ring 24
is part of a bussing assembly described in my copending application
entitled "CONNECTOR MODULE" and filed Sept. 7, 1971 as Ser. No.
178,097.
Disposed around and laterally spaced apart from contact 14 are
protective sleeve 26 of plastic such as the described fluorocarbon
and sleeve 27 of berryllium copper which serve respectively for
insulating and electrical shielding purposes. Sleeve 26 is disposed
between contact 14 and outer-tubular contact of sleeve 27 and
includes mating end 28 which engages section 12 when sections 10
and 12 are mated. As illustrated, sleeve 26 includes an outer
peripheral surface 29 with laterally projecting riser 30 which
extends around surface 29 in a direction normal to the longitudinal
axis 31 of sleeve 26 and is designed to telescopingly engage with
surface 34 of section 12. Mating end 28 except for riser 30 is
sized so as to be spaced apart from sleeve 27 to permit release of
the sleeves. As illustrated, sleeve 26 extends longitudinally
beyond contact 14 and is laterally spaced apart from the
contact.
Section 12 also includes protective sleeves 32 and 33 which provide
insulative and electrical protection for central contact 16 in a
similar manner to sleeves 26 and 27 in respect to contact 14. The
combination of sleeves 32 and 33 provides at least one surface
illustrated in FIG. 1 as surface 34 on sleeve 33 for snug
engatement and more advantageously an interference fit with riser
30 of sleeve 26. Sleeve 33 includes mating end 35 from which
surface 34 extends rearwardly as a smooth annular shape with a
minimum cross section at mating end 35 in order that the heat
deflection and distortion in sleeve 26 will not result in the
interlocking of sleeves 26 and 33 together. Since riser 30 also
serves for sealing purposes, it is preferred that surface 34 be
circular with its diameter remaining essentially constant for
length 36 over which riser 30 passes.
In some instances, as illustrated in FIG. 2, connector sections 13
and 15 are provided in which section 15 includes metallic sleeve 37
with surface 38 for mating with riser 39 of sleeve 40 and no
separate insulating sleeve is provided. Metallic sleeve 37 also
includes outer surface 41 for mating with metallic sleeve 42 to
provide electrical connection between the two outer contacts.
Sleeve 42 includes mating end 43 shaped as a spring 44 which
resiliently bears against metallic sleeve 41. As illustrated,
section 15 is formed with glass insulator 85 as part of a hermetic
seal (not shown).
As illustrated in FIG. 3, insulating sleeve 45 can provide surface
46 upon which riser 47 engages during the mating. In this
embodiment, central contacts 48 and 49, insulating sleeves 45 and
50, and outer tubular contacts 51 and 52 respectively become mated.
As illustrated, sleeve 50 is sized so as to telescope over surface
46 of sleeve 45 with riser 47 engaging surface 46.
Mating sections 10 and 12 of FIG. 1 are releasable and separately
illustrated in FIGS. 4 and 5 respectively. Contact 14 is centrally
mounted on internal collar 53 of sleeve 26 and locked into its
position along longitudinal axis 31 by retainer clip 54 of
beryllium copper which includes a forwardly extending inwardly
tapered end 55 which engages shoulder 56 of cylinder 21 on contact
14 and resists movement in a rearward direction. Rear sleeve 57 of
clip 54 serves to prevent contact 14 from moving in a forward
direction by engaging outer flange 58. Clip 54 includes outer
collar 59 snugly positioned between shoulder 60 of sleeve 26 and
surface 61 of rear insulator 62 of a high-temperature plastic to
retain clip 54 in section 10.
After an external contact (not shown) is connected to socket 20 and
its shielding cable is connected to rear ferrule 63, connector
section 10 is potted by pouring a potting compound into aligned
apertures 64 and 65 in sleeves 26 and 27 respectively. In this
operation, the rear internal end 66 becomes potted and retains rear
insulator 62, sleeve 26, and contact 14 in position. The potting
compound is prevented from entering socket end 20 by the presence
of the external contact. Outer metallic sleeve 27 is formed as
spring 67 on mating end 68 and when mated with sleeve 33 (FIG. 5),
bears against its surface 69 with sufficient force to prevent
accidental removal of the sections 10 and 12. Spring 67 is
conveniently formed with an inwardly depressed bow 71 which extends
to a forwardly positioned, inwardly bent hook 72.
FIG. 5 is illustrateive of mating section 12 without central
contact 16 and includes internal collar 73, retainer clip 74, and
rear insulator 75 similar to those members described for section
10. Sleeve 32 is cylindrical shaped and extends forwardly with
smooth inner and outer surfaces 76 and 77 to mating end 78.
Central socket 79 for the mating section 13 of FIG. 2 is
illustrated in FIG. 6 and includes forward and rear sockets 80 and
81 separated by cylindrical mounting portion 82. Forward socket 80
includes pressure spring 83 to bias socket 80 inwardly. A forwardly
hooked hood 84 is fastened over socket 80 and limits the outward
deflection of socket 80.
The foregoing description of the present invention is only
illustrative of an exemplary form which the invention may take.
Still other modifications and variations will suggest themselves to
persons skilled in the art. It is intended, therefore, that the
foregoing detailed description be considered as exemplary only and
that the scope of the invention be ascertained from the following
claims.
* * * * *