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Патент USA US3028585

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April 3, 1962
M. LAzAR ET AL
3,028,575
REMOVARLE CONTROL ASSEMBLY FOR AN ELECTRICAL CONNECTOR
Filed May 14, 1958
2 Sheets-Sheet 1
1NVENTOR.
MICHAEL LAz-AR".
BY
JOSEPH u. BERTRAM.
ATTORNEY
April 3, 1962
M. LAzAR ET AL
3,028,575
RENOVABLE CONTROL ASSEMBLY FOR AN ELECTRICAL CONNECTOR
l
[l l '
INVENTORS
BY
MICHAEL LAZAR.
JOSEPH d. BERTRAM.
MM
ATTORNEY
United States Patent O
r'
ICC
3,028,575
,
Patented Apr. 3, 1962
2
l
from sheet ymetal for use in the electrical connector of
our invention;
FIG. 6 is a view in perspective of the pin contact of
FIG. 5 rotated 180° about its longitudinal axis;
FIG. 7 is a view in perspective of the socket contact
formed from sheet metal for use in the electrical connec
tor of our invention;
FIG. 8 is a side view in cross section of a plug and
receptacle portion of an electrical connector having mul
3,028,575
REMOVABLE CQNTROL ASSEMBLY FOR AN
ELECTRICAL CDNNECTOR
Michael Lazar, White Plains, N.Y., and Joseph J. Ber
tram, Norwalk, Conn., assignors to Burndy Corpora
tion, a corporation of New York
Filed May 14, 1958, Ser. No. 735,229
7 Claims. (Cl. 339-217)
This invention relates to electrical connectors of the 10 tiple pin and socket contacts;
FIG. 9 is a view in cross section of the mated pin and
contacts and, more particularly, to electrical connectors
socket contacts of our invention;
l0 is a view in cross section showing the first step
having multiple pin and socket contacts which are remov
in the releasing of the contact of our invention from its
able from mating plugs and receptacles.
mating plug and receptacle type having pin and socket
The advantages of electrical connectors of the mating
plug and receptacle type having multiple pin and socket
contacts is obvious, but the prior art connectors have not
been completely satisfactory `because the known struc
tures have often required a-large number of different
components to be manufactured by relatively expensive
methods. The contacts, once assembled in their respec
tive plugs and receptacles, could not be removed nor
housing; and
'
FIG. 11 shows the second step in the releasing of a
contact of our invention from its housing.
Referring to FIG. 1 of the drawing, an exploded view
of an electrical connector in accordance with .the princi
ples of our invention is therein seen to comprise a socket
il) with an associated socket retainer spring 12 which,
as one of its functions, retains the socket 10 within the
insulation housing 14. A pin or male contact 16 utilizes
could they be interchanged, and usually, the contacts re
a pin spring retainer i3 in a similar manner to retain the '
quired that a solder operation be performed in a diñcult
25 pin'contact 16 within the bore of insulation housing 26.
location under poor conditions.
Insulation housing I4 having a socket 10 therein maybe
One of the objects of this invention, therefore, is to
provide a novel contact structure for use in electrical
termed a “receptacle” while the assembly of a pin con~
connectors of the mating plug and receptacle type.
tact l5 within insulationhousing 20 is normally called a
Another object of this invention is to provide a contact
assembly structure which allows easy insertion and ready 30 pThe female or socket contact 1li comprises a body por
tion 21 including a 'wire receiver or barrel portion 22
removal from the supporting plug or receptacle.
and having at the rear end thereof an insulationY grip
Still another object of this invention is to provide a
terru’le 24`and at the forward end an entry portion 28.
novel socket contact assembly which has a closed entry
The entry portion' 23' has a central opening to receive-the
substantially preventing damage thereto due to the inser
tion of an oversized pin contact or probe.
‘
35 pin contact 16. The central opening is substantially comi-
A further object of this invention is to provide a novel
pletely enclosed by the entry portion 28 and forms a
socket contact having a single spring member functioning
' “closed entry socket” which is a socket limiting the size
to retain the mating piu in the socket, ensure electrical
of the pin which can be acceptedtherein close to the
substantially complete surrounding of the 'central openv~`
Contact of the cooperating contact members and retain
the socket in the supporting receptacle.
Still a further object of this invention is to provide an
electrical connector structure having a minimum numberl
of parts which can be readily and .inexpensively fabri~
cated.
’
‘
ing. To the rear of the closed entry y2i; is a T-slot 30
comprising' a longitudinal slot 32 and a transverse'slot
Zilli. A peephole 26vis provided-as the wire receiver por
tion of the body 22 at the rear of lshoulder 23.'
t '
' The closed entry portion 28 of the socket 10 limit/sl the:
maxim-um size of mating pin contact which can lbe'
One of the features of this invention is the provision
accepted. lt is also desirable to' Vkeep the widthgof the
of a multiple contact plug and receptacle type electrical
longitudinal slot 3‘2 of the T-slot 30 less than the diameter
connector wherein the mating portions may be of identi~
of the pin contact to be inserted. If the width of the slot
cal design, each havingl a plurality of bores therethrough
32 is Vgreater than the diameter of the pin inserted, it
into which are removably disposed mating vpins and
sockets. In one embodiment the pins and sockets each 50 may be possible to cause the pin to project through` the
slot and cause damage. lt is also desirable that any test
have a tubular body portion about which is disposed a
probe which is inserted into the socket 10 have a diam-‘
retaining spring which locks the Contact to the recep
tacle.
Each retaining spring includes a releasing cam
eter greater than the width of slot 32.
'
_ `
A tubular-shaped retaining spring 12 shown in greater
surface which, when acted upon, permits the removal of
55 detail in FIGS. 2 and 3 may be formed of sheet metal
the contact from the bore of the receptacle.
shown in FIG. 4. 'Ihe blank shown in FIG. 4 is stamped
These and other features and objects of this invention
from resilient spring material such as beryllium copper
will become more apparent by reference tothe follow
and the edges 36a and 36h are brought together to form
ing description taken in conjunction with the accom~
a cylindrical shape having a longitudinal slit 36. One
panying drawings, in which:
60 portion of retaining spring 12 forms a tongue 38 which
FiG. l is an exploded view partly in cross section of
is formed or pressed inwardly. The end of the tongue i8`
the receptacle and plug portions of an electrical connec
is preferably slightly curved upward. The outer or for
tor, each containing a socket and pincontact respectively;
Ward end of spring 12 is formed into La spiral lstrap '40
FiG. 2 is an enlarged View in perspective of the retain
terminated on one end with a tab 42. The spiral strap 40
ing spring for use with the contacts of the electrical con
has its forward end 46 closer to the central axis of `the
nector of our invention;
l
cylindrical spring 12 than the rearward edge 44 of the
FlG. 3 is a front end view of the retaining spring shown
in FIG. 2;
strap 40. Due to the slope or differential in the distance
from the axis of the spring 12 to the edges 44 and 46,
FlG. 4 is a plan view of the sheet metal stamping
the spiral strap 4i) assumes a conical shape which func
from which the retaining spring of FIG. 2 is formed; 70 tions as a camming surface. The rear end of the retain~
FIG. 5 is a view in perspective of a pin contact made
ing spring 12 is upset in a plurality of places to form re
,esagera
n
à
taining louvers 48.
In manufacturing the cylindrical
spring for use with our invention, a tie or connecting strip
49 is utilized to join the spring blanks during manufacture
and upon assembly easily detaches from the connecting
strip by breaking along the dotted line 47.
The housing 14 for the contact assembly comprising
contact 10 and spring 12 includes an insulating block
having a bore 50 therethrough. The bore 50 has a re
stricted portion 51 of minimium diameter under which
the spring 12 is disposed when the spring and contact are
inserted into the bore 50. The louvers 4S of the spring
12 cooperate with the shoulder 54 of the restricted por
tion 51 to limit the forward movement of the Contact as
sembly. The rear edge 44 of the spiral strap of the spring
closed entry portion 100 of the socket body 78a. '111e pin
82 is separated from the body portion 78 by a transition
S4 and the pin contact 75 is terminated at its rear end in
a U-shaped trough 86 which has two upstanding ears 88
for gripping the wire and separated therefrom are larger
ears ‘90 for gripping the insulation of a conductor. The
contact iliustrated lin FIGS. 5 and 6 or 7 may be applied
to a conductor in any well known manner by having the
ears 88, 88a and 90, 90a about a bared conductor and its
insulation, respectively. A cable stop 92 is provided at
the rear of the T~shaped slot 94. The cable stop 92, 92a,
is formed by pressing in a portion of the body wall. The
T-shaped slot 94, 94a comprises a transverse slot 96, 96a
and a longitudinal slot 98, 98a. The socket contact illus~
trated in FIG. 7 is similar in every respect to the pin
12 engages the front shoulder 52 of the bore 50 so that
contact shown in FIGS. 5 and 6 except that its forward
the contact assembly cannot be pulled out or moved to
end terminates in an entry 100 which is adapted to
the rear of the bore. The camming surface of the spiral
receive the pin contact 82.
strap permits the forward movement of the contact assem
ln order to produce a sheet metal closed entry contact
bly within the bore until the louvers 48 engage the shoul
der 54 at which time the rear edge 44 of the spiral strap, 20 of improved strength, it may be desirable to braze the
seam 80a. This will ensure that the entry 100 will not
due to the tendency of the strap to return to its original
accept an oversized probe or pin.
shape, locks into the forward shoulder 52. The remaining
The completed Contact assembly for either the sheet
portions 56 and 58 of the bore 50 receive the barrel and
metal or machined pin and socket comprises the contact
insulation ferrule portions of the contact, respectively. A
plus the spring retainer. 'Ihe tubular spring retainer of
shoulder 57 provides the transition between the two por
FIG. 2 is fitted over the body portion of the Contact and
tions 56 and 5S of the bore 50. If desired, shoulder 54
has its inwardly depressed or deformed tongue 38 dis
may be chamfered to ease insertion of the contact.
posed into the longitudinal slot of the contact. The
The pin or male contact 16 comprises a body portion
spiral strap 40 of the spring retainer is designed to fit
60 having at the rear end thereof an insulation grip 62.
In front of the insulation grip 62 is a peephole 63. The 30 within the transverse slot of the contact. Thus longi
tudinal movement of the spring on the contact is pre
portion of the body between the insulation grip 62 and
vented because the depressed tongue 38 is in contact with
shoulder 64 comprises a wire receiver barrel into which
the end of the longitudinal slot while the front edge 46
the bared conductor is positioned. When the bared con~
of the spiral strap 44 is in contact with the edge of the
ductor is properly positioned in this barrel, a portion of
it is visible through the peephole 63. Forward of the 35 T-slot. Additional longitudinal movement is prevented
by a portion of the strap 44 abutting the rear edge of
peephole63 is a shoulder 64. The front end of the body
the transverse slot. Rotary movement of the spring on
portion 60 includes a T-slot 66 comprising a longitudinal
the tubular socket body is prevented because the tongue
slot 68 and a transverse slot 70. It is seen that physically
38 is depressed within the longitudinal slot and thus pre
the pin contact so far described is similar to the socket
Contact. However, the major difference is that the pin 40 vents relative axial rotation.
As an additional factor of safety, the retaining spring
socket 16 has connected to the front end thereof a male
may be secured to the contact by spot welding or brazing
or pin portion 72 which is adapted to be inserted within
or adhesive, although this is not essential since the co
the socket contact 10. As shown, connected to the pin
operation of the T-slot and the spring will limit relative
contact 16 in FIG. 1, an insulated conductor comprising
motion. The spring is formed in such a manner that the
insulation 74 over conductive wire 76 is joined to the
tubular body portion grips the body of the contact while
contact 16 by having a portion of the insulation bared
the strap portion 44 has a tendency to maintain its
and the wire inserted into the barrel or Wire receiver of
original shape which provides a diameter at edge 44
the body portion with the edge of the insulation 74 under
which is larger than the diameter measured at the tubular
lying the insulation grip 62 and a bared portion of the
body portion of the spring.
conductor underlying the peephole. A crimp or indenta
Referring to FIG. 8 of the drawing, there is therein
tion 65 is then made in the body portion, coining the body
shown a multiple contact connector in accordance with
to the bared wire 76 in the barrel and the insulation grip
the principles of my invention. An insulation housing
62 is crimped to the insulation 74 as shown. Obviously,
102 having a plurality of bores therein 104 and 106 is
an insulated conductor can be connected to the socket
contact 10 in a similar manner.
55 provided. Each bore 104 and 106 is similar to the bores
shown in FIG. 1. A socket contact 108 is inserted in
The pin contact 16 has associated with it a pin retainer
the rear of 102 and moved forward into the bore 104.
spring 1S and an insulation housing 20. The spring 18
The rear cam edge of the tubular spring 110 locks onto
and the housing 20 for the pin contact 16 are identical in
the front shoulder of the bore 104, while the rear louvers
structure and function to the spring retainer 12 and the
housing 14 associated with socket contact 10 and are 60 prevent forward movement of the socket and spring as
sembly by engaging the middle shoulder of the bore 104.
actually interchangeable therewith. In order to so indi
A wire 112 is inserted in the socket contact and the in
cate this identity, the reference characters of spring 12
sulation grip 114 and wire receptacle 116 function as
and housing 14 have been applied to the drawing of spring
heretofore explained.
18 and housing 20 with the addition of the reference letter
The bore 106 has a pin contact inserted therein. For
"a” thereto.
65
purposes of illustration, a pin contact 109 is inserted in
While the socket contact 10 and pin contact 16 illus
bore 106. A mating connector comprising an insulation
trated in FIG. 1 may be machined, it is advantageous to
stamp or form or otherwise manufacture these components
from sheet metal stock. Such sheet metal contacts are
housing 103 (which is identical to the housing 102) has
bores 118 and 130 located therein. A pin contact 120
illustrated in FIGS. 5-7. Referring to FIGS. 5-7, the 70 is inserted in bore 118 and in the usual manner heretofore
explained, the spring 122 is utilized to position the con
sheet metal pin and socket contacts 75 and 77, respec
tact within the bore and the conductor 124 is bared and
tively, are each seen to comprise a generally tubular body
inserted into the wire grip 128 while the insulation grip
78 and 78a having longitudinal seams 80 and 80a therein.
126 is closed upon the conductor insulation. In a simi
The pin contact 7S of FIGS. 5 and'6 has at the forward
end thereof a pin portion S2 designed to tit within the 75 lar manner, a socket contact 107 is located within bore
accesar;
Mi
o
d
130. It is obvious that since the pin and socket con
tacts are interchangeable within the bores of the insula
tion housing, it is necessary to make sure that mating
contacts oppose one another in each housing 102 and 103.
To assure proper connection, polarizing connections
132, 133, 134, and 135 are utilized. Each of the polar
izing connections 132-135 terminate in their rear with
threaded portion 138 having lock washer 139 and nut 141)
for mounting the plug onto a panel 142. In use, the two
complished, as it is obvious that the particular embodi
ments herein shown Áand described are only some of the
many that can be employed to attain these objects and
accomplish these results.
We claim:
‘
l. A spring for mounting on a tubular contact support
comprising a resilient sheet metal =blank pressed into tu
bular form and including first means for cooperating with
said support and preventing rotation of said spring «there
mating portions are brought together properly due to l0 on, second means for cooperating with said support for
the polarizing connections and the pin contact fit into
preventing longitudinal movement of said spring thereon
the socket contacts. Obviously, either housing may con
and first and second opposed radially projecting longitudi
tain contacts of one type, i.e., all pins or all> sockets, or,
nally spaced stops for locking said spring within a hous
if desired, the pins and sockets may be located in the
ing said first radially projecting means comprising a strap
most convenient bores, provided mating contacts are lo
cated in opposed bores.
Referring to FIG. 9 of the drawing, a pair of mating
contacts in accordance with the principles or" my inven
tion are shown connected to each other. A plug 144
having an insulation housing containing a bore 148 is
shown in the left-hand portion of, FIG. 9. Located with
in the bore 111% is a pin Contact 151i on which is disposed
a pin retaining spring 152. The spring cam surface 154
engages the front shoulder 153 of the bore. The rear
louvers 156 of the spring retainer 152. engage the rear l
shoulders 169 of the restricted portion of the bore. The
wire 166 is bared and inserted within the wire grips 162
which are crimped for mechanical strength and electrical
connection and the insulation of the wire is gripped by
means of insulation grip 164. The bore 148 is widened
at the rear end thereof to provide sufficient clearance for
the insulation grip. The receptacle 146 comprises the
insulation housing containing a bore 19u in which is lo
cated a socket contact 168.
The socket contact has
portion for disposition concentrically on said tubular con
tact and having the rear edge thereof radially projecting
so that said strap is of generally spiral shape a portion
of said strap disposed Within the periphery of said tube.
2. An electrical contact yassembly for an electrical con
nector; said connector including a dielectric housing hav
ing a >Contact receiving bore therein, said bore being re
stricted in `a ,portion thereof to provide front and back
stop shoulders; said contact assembly comprising: a
metallic Contact including integral conductor receiving
and body portions; a sleeve disposed circumferentially
about said contact and including outwardly extending re
taining fianges adapted to engage the bore b-ack stop
shoulder, a strap integral with said sleeve, its rear por
tion extending radially from said sleeve and adapted to
engage said `‘bore front stop shoulder, land its front por
tion forming a camming surface; such that said rear por
tion is adapted to be disengaged from said bore front stop
shoulder in response to a longitudinal thrust on said cam
ming surface; said `Contact and circumferential sleeve be
mounted thereon a spring 173 having spring tongue 172 35 ing adapted to be jointly and concurrently inserted and
deformed inwardly. The cam surface 174 engages the
removed from said housing bore; and means to ñxedly
front shoulder 176 of the bore to provide a locking action
prevent rotational movement of said contact relative to
while the rear louvers 17S engage the rear shoulder 13€)
of the bore.
The wire 186 is bared and the socket is
said sleeve.
.
3. A retention clip for mounting on a contact, com
crimped thereto at 182 while the insulation is gripped by 40 prising: a sheet metal blank lfor-med into a tube and in
a second crimp 184. The pin portion of pin contact 151i
cluding first means for cooperating with said contact and
is inserted into the closed entry of the socket 168 and
preventing rotation of said clip thereon, second means
electrical contact is made thereby. Electrical contact is
for cooperating with said contact `for preventing longitudi
assured due to the tongue finger 172 pressing on the pin
nal lmovement of said clip thereon, and first and second
portion of the male contact 15€).
opposed, radially projecting, longitudinally spaced stops
Referring to FIG. 10, there is therein shown a remov
for locking said clip within a housing, said ñrst radially
able socket contact 196 disposed in the bore 19t) of insu
projecting means comprising a strap portion for disposi
lation housing 189 and retained therein by means of a
spring retainer 1%. The rear louvers 201 abut upon
the rear shoulders of the bore and prevent the socket
assembly from being inserted too far. When the rear
lonvers 201 abut the rear shoulder, the rear portion of
the cam surface 192 locks onto the front shoulder ot the
bore.
To remove the contact, a tool 200 having a hol
low bore 202 is fitted over the front portion 191 of the
socket contact 196. As the tool 209 is fitted over the
front portion of the socket contact, the spiral strap cam
tion concentrically on said contact and having the rear
edge thereof radially projecting, =a portion of said strap
disposed within the periphery of said tube.
4. An electrical connector assembly comprising an
insulation housing having a contact receiving fborc there
in, said bore being restricted in a portion thereof to pro
vide front and `back stop shoulders, an elongated cylindri
cal lmetallic contact body including at least a conductor
receiving portion and a body portion, said body portion
ming surface 192 is depressed, releasing it from the front
including a' transverse recess, a split tubular spring sleeve
shoulder as shown in FIG. 11. An axial force applied to
the right now causes the withdrawal of the socket 196
ing outwardly extending retaining flanges to engage said
Obviously, while a socket contact is shown in FIGS.
tending `from said tubular spring to engage said front stop
shoulder and limit longitudinal movement of said con
disposed circumferentially `about said contact and «includ
back stop shoulder, a spirally wound strap integral with
from the bore 190 in insulation housing 189, permitting 60 said
spring having its rear portion thereof radially ex
the removal of the contact.
10 and 1l, the 'bore 202 of tool 200 is sufficiently deep
to accept the pin portion of la pin contact 'and the opera
tact and forming a camming surface such that said strap
rear portion is disengaged in response «to a longitudinal
tion of removability or insertion is substantially the same. 65
thrust
on said camming surface, said strap cooperating
We have thus described our invention, but we desire
with said recess on the body portion vfor limiting move
it understood that it is not confined to the particular
ment of said spring on said contact and said recess pro
forms or uses shown and described, the same being mere
viding space into which said radially extending rear por
ly illustrative, and that the invention may be carried out 70 tion of said strap is disposed in response to said longitudi
in other ways without departing from the spirit of our
nal thrust.
invention, and, therefore, we claim lbroadly the right to
5. A resilient sheet metal blank for Iforming a tubular
employ all equivalent instrumentalities coming within the
spring comprising »a generally rectangular main body scc
tion including a plurality of projecting detents adjacent
objects of our invention are attained and new results ac 75 the rear thereof formed by part shearing said sheet metal,
scope of the appended claims, and by means of which,
scadere
7
a resilient tongue portion extending lforwardly from said
main body section and an additional portion extending
forwardly from said main `body section including a curved
strap at the forward edge of said blank having one end
terminating in a tab extending beyond the side of said
main body section.
6. An electrical connector assembly comprising:
an insulation housing having a front and a rear face
and a contact receiving bore therethrough from face
to face, said bore having a constriction therein pro
viding a front and a rear shoulder;
and a contact assembly including an elongated metal
lic contact having a forward body portion and a rear
ward conductor receiving portion, said body portion
including a recess therein;
a split tubular sleeve disposed contiguously and circum
ferentially about said contact;
outwardly extending retaining means secured to said
Contact assembly and rearward of and abutting said
bore constriction rear shoulder;
an outwardly struck up resilient portion from said
sleeve forward of and abutting said bore constriction
front shoulder, said struck up portion providing an
and a contact assembly including an elongated metal
lic contact having a forward body portion and a
rearward conductor receiving portion, said body por
tion including a recess therein;
a split tubular sleeve disposed externally, contiguous
ly and circumfcrentially about said contact;
outwardly extending retaining means integral with one
of the elements of said contact assembly and rear
ward or” and abutting said bore constriction rear
shoulder;
an outwardly struck up resilient portion from said
sleeve forward of and abutting said bore constriction
front shoulder, said struck up portion providing an
exterior, outwardly and rearwardly extending cam
ming surface such that said struck up portion is dis
engaged from sa-id bore constriction front shoulder
in response to a longitudinal thrust from the direc
tion of said `housing front face on said camming sur
face, said struck up portion abutting within said con
tact recess to prevent rearward movement of said
Contact relative to said sleeve, said contact recess
providing space into which said struck up portion is
disposed in response to said longitudinal thrust on
exterior, outwardly and rearwardly extending carn
ming surface such that said struck up portion is dis
said camming surface;
and a portion integral with said sleeve abutting within
engaged -from said bore constriction front shoulder
said contact recess to prevent forward movement of
in response to -a longitudinal thrust from the direc
tion of said housing front face on said camming sur
face, said struck up portion cooperating with said
contact recess to prevent rearward movement of said
contact relative to said sleeve, said contact recess
providing space into which said struck up portion
is disposed in response to said longitudinal thrust
on said camrning surface;
and means secured to said sleeve cooperating with said
contact recess to prevent forward movement of said
contact relative tto said sleeve;
whereby said contact and sleeve may be concurrently
inserted into, snap locked within and removed from
40
said bore by way of said housing rear face.
7. An electrical connector assembly comprising:
said Contact relative to said sleeve;
whereby said Contact and sleeve may be concurrently
inserted into, snap locked within and removed from
said bore `by way of said housing rear face.
References Cited in the ñlc of this patent
UNITED STATES FATENTS
1,387,252
2,389,454
2,463,826
2,477,849
2,689,337
2,715,215
2,716,744
an insulation housing having a front and a rear face
and a contact receiving ‘bore therethrough from face
to face, said bore having a constriction therein pro
viding a front and a rear shoulder;
Fredricks ____________ __ Aug. 9,
Picard ______________ _- Nov. 20,
Thacker _____________ __ Mar. 8,
Adams ______________ __ Aug. 2,
Burtt et al. __________ __ Sept. 14,
Flora ________________ __ Aug. 9,
Swanson et al _________ __ Aug. 30,
1921
1945
1949
1949
1954
1955
1955
FOREIGN PATENTS
563,966
643,627
Belgium ______________ __ Jan. 3l, 1958
Great Britain _________ __ Sept. 20, 1950
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