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Патент USA US3085232

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April 9, 1963
‘ w. s. WATTS
Filed May 13, 1960
Uuuan Swans
{Patented Apr. 9, 1963
William S. Watts, Harrisburg, Pa, assignor to
AMP Incorporated, Harrisburg, Pa.
Filed May 13, 1950, Ser. No. 28,?17
4i Claims. (ill. 339-217)
corresponding contact in the contact set of the ?xed plug
board, not shown.
Plug 6 comprises a hollow cylindrical sleeve or shell
10 of a conductive metal, such as tin-plated brass, pref
erably rolled up from ?at sheet stock into tubular form
with a butt seam 12 extending longitudinally of the
sleeve, FIGURE 4. At its rearward end, the left-hand
end as viewed in FIGURE 1, sleeve 10 is provided with
This invention relates to plug contactors for use with
integral means 14 by which conductor 16 is mechanically
the plugboar-d or circuit connecting panel of an electrical
calculating or accounting machine or the like, and more 10 and electrically attached to the plug. Preferably attach
particularly to a spring detent system securing the plug
ing means 14 is formed into a ferrule from an initially
from being pushed from the plugboard by ordinary pres
U-shaped cross-sectional con?guration, the ferrule being
sures on the nose of the plug, but permitting Withdrawal
tightly crimped around wire core 18 of the conductor,
from the plugboard by a pull on the rear portions of the
FIGURE 5, by cold-forging techniques conventional in
15 the art as illustrated, for example in Patent No. 2,600,012,
.p "lghe detent systems of the prior plugs of the type de
issued June 10, 1952, to James C. Macy. To take up
scribed are of complex design, generally including mul
any metal of the ferrule in excess of that required to en
compass wire core 18, and to align the wire core more
tiple parts which are expensive in manufacture and to
incorporate in assembly in the plug body. It is among
nearly coincident with the plug axis, the anvil die, not
the objects of the present invention to provide a spring 20 shown, utilized in forming the crimp may have a central
rib to form a longitudinally extending indentation 19 in
detent system for such a plug embodied in a single piece
of inexpensive material and simple design, which piece
the bottom of the crimp.
may easily and quickly be assembled in a plug body. An
An insulating sheath 20 of a suitable resin, such as
other object of the invention is the provision of a plug
polyvinyl chloride, preferably is molded around the rear
of the type described which is simple and economical 25 end of the plug and adjacent portions of the insulation
of conductor 16. Sheath Z0 insulates the ferrule or at
in construction while being rugged in use and foolproof
taching means 14 and supports the adjacent portion of
in operation.
Other objects and attainments of the present invention
conductor 16 to increase its resistance to bending fatigue
while conveniently sewing as a handle for manipulating
will become apparent to those skilled in the art upon
a reading of the following detailed description when
the plug.
taken in conjunction with the drawings in which there
At the rearward end of the cylindrical body of sleeve
are shown and described several illustrative embodiments
10 adjacent the forward end of sheath 20, an integral
circumferential bead 22 is provided, the bead being dis
of the invention; it is to be understood, however, that
limiting of the invention [but are given for purposes of
posed so as to engage the face of plugboard 4 adjacent
edge portions of an aperture 2 to act as a stop for limit
illustration in order that others skilled in the art may
ing movement of the plug into the plugboard.
fully understand the invention and the principles thereof
Forwardly, nose 8 smoothly converges to present a
rounded tip, except for an opening-or slot 24 at the very
these embodiments are not intended to be exhaustive nor
and the manner of applying it in practical use so that
they may modify it in various forms, each as may be 40 tip, in alignment with and symmetrical about the longi
tudinal axis of the plug for purposes to be explained.
best suited to the conditions of a particular use.
Disposed within sleeve 10 to provide the spring detent
iIn the drawings:
system of the plug is a spring 26 which is arranged to
FIGURE -1 is a longitudinal section View of an em
render the plug capable of being relatively easily in
bodiment of a plug contactor incorporating features of
the present invention, the plug being fully inserted in a 45 sorted and withdrawn by sheath 20 or conductor 16, but
ordinarily incapable of being dislodged from the plug
board by forces applied to the nose of the plug, except
under very violent conditions where it may be preferred
spring detent system during insertion of the plug in a
to lose the detent latch rather than risk extensive damage
plugboard aperture;
50 to the plug or plugboard. In general, spring 26 may
FIGURE 3 is a view similar to FIGURE 2 in a further
be formed of any spring material of any suitable cross
sectional con?guration which is resistant to crumpling on
stage during insertion of the plug;
axial loading, for example, steel piano wire.
FIGURE 4 is an enlarged sectional view taken along
As shown in FIGURE 1, the forward portion of spring
line 4-—4 of ‘FIGURE 1;
26 is generally U-shaped, the Ibight 28 extending into
FIGURE 5 is an enlarged sectional view taken along
slot 24 and presenting a rounded tip, from which the legs
line ‘5—5 of FIGURE 1; and
30 of the U gradually diverge to merge smoothly into
FIGURE 6 is a view similar to FIGURE 1 illustrating
the forward legs 32 of the V-shaped ear or detent por
a modi?ed form of a plug contactor.
tions 34. A pair of diametrically spaced longitudinal
The particular type of plug contactor to which this
invention relates is especially adapted for use in the plug 60 slots 36 in the forward portion of sleeve 10, and spaced
from bead 22 a distance slightly greater than the plug
board wiring system of an electrical accounting or cal
board thickness, provide openings through which detents
culating machine or the like, which system typically in
34 project for engaging behind the aperture edges on the
cludes a ?xed plugboard carrying a set of permanent con
front face as bead 22 comes into abutment with the rear
tacts arranged in rows and columns. A movable plug
face of the plugboard.
board removably carrying a corresponding set of plug
The rear legs 33 of detents 34 extend at a steep angle
contactors is arranged to bring the sets of contact elements
to the longitudinal axis of the plug to lie substantially
into engagement so as to complete the electrical circuits
parallel to the face of the plugboard on insertion of the
plug. Adjacent its ends, which reenter sleeve 10, legs 38
Referring now to FIGURES 1 through 5, a plurality
engage the back edge of slots 36, legs 32 engaging the
of apertures 2 of plugboard 4 receives a set of plug con
forward edge of slots 36 to de?ne the rest position of
tactors, such as the plug generally designated at 6, in an
the detent spring, at which position bight 28 at least is
array each for interengaging at its projecting nose 8 a
FIGURE 2 is a fragmentary longitudinal section view
of the plug of FIGURE 1 illustrating the action of the
disposed within and preferably protrudes slightly out of
slot 24.
From the foregoing, it will be appreciated that bight
28 need not protrude in the rest position of spring 26
On assembling the plug, spring 26 is inserted through
from nose 8 as shown, but may be ?ush to the same effect.
the rear of sleeve 10 until detents 3-4 protrude through
slots 36 as bight 28 enters slot ‘24, legs 30 being formed
with an initial bias tending to open spring 26 slightly
In addition, if it be assured that at least initially the
edges of the plugboard aperture exert no inward camming
component on the detents, as by arranging lateral legs
more than the diameter of sleeve 10 to assure protrusion
38 to lie parallel to the plugboard face, or to have a
of detents 34 and retention of the spring in position.
Slot 24, in length, is in alignment with slots 36 and thus
slight reverse inclination, adequate strength of spring 26
of bight 28 properly oriented for insertion in slot 24.
Ferrule means 14, upon wire core 18 being laid therein,
Under certain conditions of use, however, it may be
desirable that the plug be released prior to its destruction,
is crimped and sheath 20 molded over the crimp as
in which event lateral legs 38 may be slightly inclined
assures destruction of the plug or the plugboard before
can serve to locate detents 34 in slots 36 upon the plane 10 the plug will unseat on pressure applied to the plug nose.
to the plug axis as desired. i
As thus constructed and assembled, on insertion of the 15
From the foregoing, it will be seen that the embodi
plug the sloping forward legs 32 of detents 34 engage the
ments of the invention described in detail are comprised
edges of aperture 2, FIGURE 2, to initiate a camming
of a minimum number of parts which may be easily and
action tending to compress the U of the detent spring,
quickly assembled in achievement of the objectives afore
ultimately resulting in the detents being fully depressed,
said. Other embodiments, of course, will occur to those
FIGURE 3. As bead 22 engages the rear plugboard 20 skilled in the art. For example in the embodiment of
face, slots 36 pass out of aperture 2 permitting detents
FIGURE 6, to achieve simplicity in fabrication and
34 to spring out of sleeve 10, FIGURE 1, whereupon
handling, spring 26a advantageously is shown to be a
legs 38 are positioned along the ‘front face of the plug
sheet metal stamping. The characteristics and con?gura
board thereby latching the plug.
tion of the plug and spring detent system otherwise are
To withdraw the plug it is necessary only to pull rear 25 generally the same as that of the embodiment of
wardly on cord 16 or sheath 20 which applies, through
the rearward movement of the forward edge of slot 36
I claim:
relative to and along the sloping forward leg 32, a
1. In a plug contactor, a sleeve having a round front
camming-in force component to depress detents 34. As
the forward edge of slot 36 rides up leg 32 of the detent,
it will be observed that, as a coincident effect, bight 28
must move relatively forwardly in sleeve 10 thus to
portion with an elongated axially symmetrical rectangular
slot in the end thereof, a generally U-shaped detent spring
disposed in said sleeve, the bight of the U extending into
said slot and having substantially matching dimensions
protrude out of the nose of the plug more fully for a
therewith so as to be restrained from movement laterally
purpose to be explained.
of the plug axis, the legs of the U having adjacent their
ends detent portions biased to protrude through opposed
slots in the sidewall of said sleeve, the longitudinal axes
of the symmetrical slot and the opposed slots lying in the
vIt will be appreciated that by varying the slope rela
tive to the plug axis of legs 32, the force required to
insert the plug may be varied slightly; and that
required to withdraw the plug relative to the
force may be varied by inclining leg portions
or less from perpendicular relation relative to
the force
same plane. 38 more
the plug 40 - 2. A plug contactor according to claim 1 wherein said
detent spring is formed from steel wire.
3. A plug contactor according to claim 1 wherein said
When any attempt is made to unseat the plug by pres
detent spring is an integral sheet metal stamping.
sure applied to the nose, the effect is simply to urge
4. A plug connector according to claim 1 wherein said
detents 34 more forcefully into latching engagement with
the plugboard. This effect is achieved because, in order 45 detent portions are V shaped and de?ne the extreme ends
of the legs of the U.
for detents 34 to be depressed, it is necessary that, short
of complete internal collapse of the spring, bight 28 must
References Cited in the ?le of this patent
move outwardly of slot 24, as has been explained, which
is contrary to the direction the applied force is urging
it. Moreover, any force applied to bight 28 is directly
Andersson et a1. ______ .__ Dec. 6, 1949
transmitted along legs 30 to jam lateral legs 38 more
Schelke et a1. ________ __ May 29, 1956
tightly against the plugboar-d face, from which it can be
Watts ___________ __>___ Aug. 7, 1956
seen that substantial resistance to dislodgment of the plug
lFrancis ______ _'__.__;____ Apr. 2, 1957
will be o?ered even where the inside ends of the spring
are not anchored to the plug sleeve.
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