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Патент USA US3049699

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Aug- 14, 1962
D. E. CHENEY
3,049,691
INSULATION-CRUSHING TERMINAL ASSEMBLY
Filed March 20, 1959
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United States Patent O??ce
3,049,691
Patented Aug. 14, 1962
1
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3 049 691
and small enough to avoid signi?cant conductor deforma
tion and consequent loss of mechanical strength.
Donald E. Cheney, Wheaten, 111., assignor to Reliable
perform the incidental function of con?ning the conduc
INsULAnoN-cnUsHnsc’rERanNAL ASSEMBLY
The protuberances, if more than one is employed, also
Electric Company, Franklin Park, 111., an Illinois com
tor and preventing it from working its way out from
between the two members of the terminal.
Filed/Mar. 20, 1959, Ser. No. 800,882
Referring now to the drawing, the invention is shown
5 Claims. (Cl. 339—95)
embodied in a terminal of the binding post type mounted
in a terminal block. It will be understood, however, that
This invention relates to an insulation‘crushing termi
nal for a plastic-insulated conductor, and more particu 10 the invention may ‘be embodied in various other types of
terminal devices.
arly to a terminal wherein pressure is applied to remove
The numeral 5 designates a fragmentary portion of the
the insulation from the conductor at the terminal.
exterior shell of a terminal block. The interior of shell
Prior terminals have been devised which rely on pres
5 contains suitable ?ller material 6.
sure to crush away and remove plastic insulation at the
Pally
.
terminal. Such terminals, however, provide no control 15
Referring particularly to FIGS. 3 and 4, the terminal
of the invention in its ‘broadest aspect includes a ?rst
member 19 having a generally ?at surface 11. It also
there often is excess pressure. This excess pressure un
includes a second member 12 having a generally ?at
duly deforms the conductor, i.e. ?attens it out, with
surface 13. Members 10 and 12 are arranged so they
consequent loss of mechanical strength. In fact, con
ductors often are broken in two in connecting them to 20 are relatively movable toward each other, with the gen
over the amount of pressure applied, with the result that
such terminals. If not broken initially, they usually are
weakened so breaking occurs subsequently.
One object of the invention, therefore, is to provide a
terminal for plastic-insulated conductors wherein pres
erally flat surfaces 11 and 13 opposing each other and
in generally parallel relation.
Opposing surface 11 of ?rst member 10 is provided
with at least one unyielding protuberance 15.
As best
sure is employed to crush away or remove the insulation 25 shown in FIG. 2, four such protuberances 15 are em
but wherein means are provided for limiting the amount
of pressure so that no signi?cant conductor deformation
occurs.
ployed in the illustrated embodiment. These protuber
ances are so dimensioned that the tops thereof lie in and
de?ne a plane which is generally parallel to and spaced
from surface 11 of member 19. As here shown, protu
Another object of the invention is to provide such a
terminal which lends itself to use in various types of 30 berances 15 are located in quadrature relation on surface
terminal devices, such as terminal attachments, terminal
blocks, binding posts, etc.
Still another object of the invention is to provide such
11 of member 10. The protuberances provide a positive
stop means limiting the possible proximity of the oppos
ing surfaces of the relatively movable members 10 and 12.
The numeral 20‘ designates a plastic-insulated conduc
a termnial which is inexpensive to construct and which
35 tor of the type commonly used in the communications
is highly e?ective in use.
?eld at the present time. By way of example, plastic
Other objects, advantages and details of the invention
material used for insulation on conductors of this type
will become apparent as the description proceeds, ref
erence being had to the accompanying drawing wherein
one embodiment of the invention is shown.
It will be
is polyethylene or polyvinyl chloride.
Such insulation
material, while providing satisfactory insulation, has the
understood that the description and drawing are illustra 40 characteristic of readily being crushed away from the
conductor in response to the application of moderate pres
tive only and that the scope of the invention is to be
sure. This characteristic, of course, is taken advantage
measured by the appended claims.
of in terminals of this character to avoid the time con-.
In the drawings:
suming step of physically removing the insulation from
FIG. 1 is a fragmentary elevational view, partly in sec
tion, ‘of a terminal block showing a portion of a terminal 45 the conductor before connecting the conductor to the
terminal. In the drawings the insulation is designated
embodying the invention;
21 and the metallic conductor itself is designated 22.
FIG. 2 is a top view of the terminal portion shown in
Means are provided for forcing members 10 and 12
FIG. 1, -a dotted line conductor shown applied to the
toward each other and into engaging relation whereby
terminal portion;
surface 13 of member 12 engages and is positioned by
FIG. 3 is a fragmentary sectional view of a terminal
the tops of protuberances 15 which act as a stop means.
block showing a complete terminal embodying the inven
This ?nal relationship is shown in FIG. 4.
tion, and
In the form of the invention shown, the means for
FIG. 4 is a fragmentary elevational view, partly in sec
forcing the two relatively movable members 10 and 12
tion, showing the terminal of FIG. 3 in operative engage
together comprises a threaded stem member 25 and a nut
ment with a plastic-insulated conductor.
member
26. As shown, relatively movable member 10 is
Before referring to the drawing in detail, a terminal
associated with and has a ?xed relation with threaded
embodying the present invention comprises a ?rst mem
stem member 25, and relatively movable member 12, in
ber and a second member relatively movable toward each
the
form of a washer, loosely is received on stem mem
other. The opposing surfaces of these members are
generally ?at and parallel to each other. The opposing 60 ber ‘25. Nut member 26 serves to force movable mem
ber 12 into engagement with the tops of protuberances
surface of one of the members has at least one protuber
15, as best shown in FIG. 4.
ance, the top of which lies in a plane spaced from the
As previously mentioned, the distance between surface
surface by a distance slightly less than the diameter of
11 of member 10 and the plane of the tops of protuber
a conductor, exclusive of insulation, to be used with the
ances 15 is slightly less than the diameter of metallic
terminal. Finally, means are provided for forcing said 65 conductor 22. This relationship results in a slight de
members toward each other with a plastic~insulated con
formation of conductor 22, but such deformation is in
ductor therebetween until the second member engages
the top of the protuberance.
When the members are thus engaged, the force applied
to the conductor is large enough to crush away and re
move the insulation from the conductor at the terminal
signi?cant so far as the mechanical strength of the con
ductor is concerned. The resulting modest deformation
is of proper amount to insure that the deforming force
is adequate mechanically to hold conductor 22 in the ter
minal. This force, however, is more than adequate to
3,049,691
3
13
crush ‘away and remove insulation 21 from conductor 22
surface slightly less than the diameter of said conductor
exclusive of insulation, and means forcing said members
toward each other with said~plastic—insulated conductor
therebetween until the top of the protuberance on said
in the regions thereof in engagement with members 11)
and 12, thus providing requisite electrical connection With
out requirinlg manual stripping.
Portion 30 of the illustrated terminal simply serves to
anchor the terminal properly in the terminal block.
It will be seen that a terminal embodying the invention
is e?ective to apply a highly controlled pressure to a
plastic-insulated conductor connected to the terminal.
one member engages the opposing surface of the other
member whereby the force applied to said conductor is
large enough to crush the insulation from the conductor
-to establish electrical connection and small enough to
avoid signi?cant conductor deformation and consequent
This pressure is great enough to crush away and remove 10 loss of mechanical strength.
the plastic insulation from the conductor at the terminal
3. The combination of claim 2 wherein said opposing
and to mechanically hold the conductor in place, and
it is small enough to avoid signi?cant conductor deforma
tion and consequent loss of mechanical strength.
surface of said one member has four spaced protuber
ances of equal height located in quadrature relation.
4. The combination of claim 2 wherein said forcing
From the above description it is thought that the con
struction and ‘advantages of the invention will be readily
apparent ‘to those skilled in the art. Various changes in
detail may be made ‘without departing from the spirit or
losing the advantages of the invention.
Having thus described my invention, what I claim as
new and desire to secure ‘by Letters Patent is:
1. An insulation-crushing terminal assembly compris
ing a plastic-insulated conductor, a ?rst member and a
second member relatively movable toward each other,
the opposing surfaces of said members being generally
?at and parallel to each other, a plurality of spaced un
yielding protuberances on the said opposing surface of
said ?rst member, the tops of said protuberances lying in
and de?ning a plane spaced from said surface by a dis
tance slightly less than the diameter of said conductor
exclusive of insulation, and means forcing said members
toward each other with said plasticeinsulated conductor
therebetween until said second member engages the tops
of said protuberances whereby the force applied to said
conductor is large enough to crush the insulation from
the conductor ‘to establish electrical connection and small
enough to avoid signi?cant conductor deformation and
consequent loss of mechanical strength.
2. An insulation-crushing terminal assembly, compris
ing a plastic-insulated conductor, a ?rst member and a 40
second member relatively movable toward each other,
the opposing surfaces of said members being generally
?at and parallel to each other, at least one unyielding
protuberance on the said opposing surface of one of said
members, the height of said protuberance above said
means comprises a threaded stem member and an asso
ciated nut member, and wherein one of the relatively
movable members has a ?xed relation with said stern
member and the other relatively movable member is a
Washer on said stem member between said nut member
and said one movable member.
5. An insulation-crushing terminal assembly compris
ing a plastic-insulated conductor, a ?rst member and a
second member relatively movable toward each other,
the opposing surfaces of said members being generally
?at and parallel :to‘each other, positive stop means on one
of said members engageable with the other of said mem
bers limiting proximity of the relatively movable mem
bers at a spacing slightly less than the diameter of said
conductor exclusive of insulation, and means forcing said
members toward each other with said plastic-insulated
conductor therebetween until said positive stop means
becomes effective whereby the force applied to said con
ductor is large enough to crush the insulation from the
conductor to establish electrical connection and small
enough to avoid signi?cant conductor deformation and
consequent loss of mechanical strength.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,206,376
1,867,918
2,137,840
2,558,851‘
2,724,809
Randall _____________ __ Nov. 28,
Lofgren ______________ __ July 19,
Hayes _______________ __ Nov. 22,
Jacobi _______________ __ July 3,
Bunch ______________ __ Nov. 22,
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