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Патент USA US3047845

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July 31, 1962
W. S. AUSHERMAN
3,047,833
BATTERY TERMINAL CONNECTOR
Filed April 12, 1961
46
22
I6
62
56
so
’
es
26
56
FIG 5
32
INVENTOR.
WILLIAM S. AUSHERMAN
"WW
A T TORNEY
United States Patent 0 ice
i
3,647,833
Patented July 31, 1962
2
FIGURE 4 is a view similar to FIGURE 3, however,
showing the connector clamped upon a smaller battery
3,047,833
BATTERY TERMINAL CONNECTGR
terminal than that shown in FIGURE 3;
William S. Ausherman, 3500 N. Topeka, Wichita, Kans.
Filed Apr. 12, 1961, Ser. No. 102,605
9 Claims. ((ll. 339—236)
FIGURE 5 is an end view of the connector of FIGURE
1 from the cable end thereof, with'the cable removed; and
FIGURE 6 is an enlarged top view of a modi?cation of
This invention relates to new and useful improvements
the clamp member shown in FIGURE 2.
Referring now to the drawings, wherein like numerals
in battery terminal connectors, and more particularly per
tains to a device of such character of two-piece construc
tion provided with cam means responsive to tightening of
designate similar parts throughout the various views, the
reference numeral 10 designates the connector generally.
securing means to cause relative translation of the two
parts such that they are moved radially toward the axis
of a battery terminal or post disposed therebetween.
A primary aim is to provide a connector that will make
The connector It) is comprised of a body member 12 of in
tegral construction, and a clamp member 14 also of in
tegral construction. The members 12 and 14' are metal
a good mechanical and electrical connection to a battery
cable on one hand and to the battery terminal on the other
tapped to achieve the features hereinafter set forth in de
tail.
lic, and preferably cast bronze machined, drilled and
hand, with each of such connections being easily made or
broken as may be necessary for cable or battery replace
The body member 12 includes a portion 16 having a lug
18 at a ?rst margin thereof and an ear 20 at a second mar
ment.
An important object is to provide a connector in ac 20 gin thereof, with such portion 16 having a concave surface
area 22 extending between the margins where the lug 18
cordance with the above aim which will function when of a
and the car 20 are positioned.
single size with various sized cables as well as with various
The clamp member 14- includes a portion 24 with a lug
sized battery terminals, especially the two most commonly
26 being provided at a ?rst margin of the portion 24 and
used sizes of terminals on conventional storage batteries
a ?nger 28 being provided at a second margin of the por
used in conjunction with electrical systems associated with 25 tion ‘24, with the portion 24 being provided with a con
internal combustion engines.
cave surface area 34} extending between such margins.
Ancillary aims and objects of the invention will be
A ?nger 28 projects through an aperture 32‘ provided in
made evident ‘during the following description of preferred
the ear 2t}. ‘Optionally, a cotter pin 34 extends through
embodiments thereof.
an opening 36 near the end of the ?nger 28 to prevent re
Broadly, a connector according to the invention com 30
moval of the ?nger 28 from the aperture 32 and separa
prises an electrically conductive body member that in
tion of the members 12 and 14*.
cludes a portion having a concave surface area extending
V
The lugs 13 and 26 are provided with openings 38 and
between ?rst and second margins of such portion adapted
40 to accommodate the shank of a square-headed bolt 42.
to engage a battery terminal, said body member including
clamp member '14‘ is provided with a shoulder 44
an integral lug adjacent the ?rst margin of said portion, 35 The
that prevents rotation of the bolt 42 during the application
an electrically conductive clamp member that includes a
of torque to a nut 46 threaded upon the bolt 42 by means
portion having a concave surface area extending between
?rst and second margins of such portion adapted to en
gage a battery terminal, said clamp member including an
integral lug adjacent the ?rst margin of said portion there
of, securing means for forcibly urging said lugs toward
‘each other, and cooperating cam means carried by the
body member portion and the clamp member portion ad
jacent their respective second margins for moving said
of which the lugs 18 and 26 are urged toward each other.
The bolt 42 and the nut 46 are preferably brass or bronze,
40
though plated steel, if deemed necessary or desirable, will
suffice. Preferably, the lugs 18 and 26 are generally paral
lel and it will become evident presently that this relation
ship is not disturbed during use of the connector notwith
standing different spacings of the lugs 18 and 26. For
reasons also to become apparent shortly, there is an
concave surface areas toward substantially direct opposi 45 oblique
motion \of the lug 26 relative to the lug 18‘ as it
tion during operation of said securing means.
More speci?cally, the cam means according to the in
vention comprises said portions being provided adjacent
their second margins respectively with an apertured ear and
approaches the latter, and accordingly the openings 38
and 40 are sized as shown to permit the bolt 42 to remain
perpendicular to the lugs 18 and 26.
‘It will be evident upon inspection of FIGURE 3 that
a ?nger, with the latter projecting through the aperture. 50
the concave surface areas 22 and 30 are conformable to
Preferably the ear is on the body member portion, though
a cylindrical surface such as the battery terminal or post
in any event the ?nger presents a surface for sliding and
48 with respect to which the connector 10 is shown ap
carnming engagement with a side or edge of the ear de?n
plied. The concaved surface area 22 can subtend an
ing a part of the periphery of the aperture in the latter.
angle in the general neighborhood of 180°, though it is
One embodiment of the invention involves the concaved 55 preferred that the angle be somewhat in excess of 180°,
surface of at least one of the portions having differing
as shown. The concave surface area 30‘ subtends an
radii of curvature.
angle in the general neighborhood of 90°, though it is
The invention will be best understood upon reference to
preferred that the same subtend an angle as large as is
the accompanying drawings illustrative of preferred em
feasible or compatible with the angle subtended by the
bodiments thereof taken together with the forthcoming
area 22. It is to be expressly understood that although
description thereof.
the surface areas 22 and 30 are shown as being conform
In the drawings:
able to a cylindrical surface, it is considered within the
FIGURE 1 is an isometric View of a connector accord
ing to the invention showing the same connected to a
scope of this invention that either one or both of such
broken battery cable;
inasmuch as battery terminals are sometimes tapered in
surface areas can be conformable to a frustum of ‘a cone
FIGURE 2 is an isometric view of the clamp member
con?guration.
forming a part of the connector shown in FIGURE 1;
It will be noted on further inspection of FIGURE 3
FIGURE 3 is a top plan view of the connector of FIG
that the ear 20 is offset so as to afford a spacing between
URE 1 showing the same secured to a large size battery 70 the portion 24 of the clamp member 14 and the ear 20‘,
post, with certain hidden structural details being shown
whereby the clamp member 14 can be easily disengaged
in dashed outline;
from the battery terminal 48 upon loosening of the nut
ll
3
46. In fact, herein lies one of the principal advantages
of the connector of this invention as the inherent ?exi
bility of two-piece construction enables easier disengage
ment of the connector 10 from the battery terminal or
post 48. After loosening the nut 46, the clamp member
1a- can be released by gentle tapping if necessary at all
upon the ear 28 or the lug 26.
Thereafter, the body
member 12 can be freed by lifting and/or twisting accom
built up adjacent the point of emergence of the opening
60 through the boss 56 as shown at 61 to reinforce the
threaded engagement of a cap screw 62 threaded in the
boss 56 through the opening 60'. It will be understood
that a battery cable comprising stranded conductors 64
provided with insulation 66 has the insulation 66 stripped
from the conductors 64 adjacent the end of the cable.
The bare electrical conductors 64 are inserted into the
open end of the recess 58 as far as possible and the cap
panied by light tapping, if necessary at all. The ease of
disengagement is also due to the fact that engagement of 10 screw 62 is then tightened to engage the electrical con
the connector 10 does not require any deformation of the
parts of the connector 10' or deformation of the battery
terminal to which it is clamped. The fact that the pre
ferred construction involves the ‘area 22 subtending an
ductors 64 a short distance from their ends, to establish
the excellent mechanical and electrical connection indi
cated in dashed outline in FIGURES 3 and 4. The cap
screw 62 is preferably brass or bronze, though if desired
angle of more than 180° further facilitates separation of 15 the same can be plated steel. The connector 10 is suit
able for connection to widely differing sizes of electric
member 12 will be apparent. Also contributing to the
cables. When especially large cables are to be used, the
ease of disengagement is the fact that during engagement
of the ‘connector 10 with a battery terminal or post, the
relative‘movement of the clamp member 14 is such that
the‘ center of curvature of the ‘area 30 moves substantially
radially with respect to the center of curvature of the
area 22, as will be seen presently. Such relative move
ment is conducive to a superior mechanical and electrical
connection to a post, and does not contribute to deforma
tion of either the connector or the terminal post as is 25
likely to be occasioned when the relative movement of
connector parts is pivotal in nature with consequent like
lihood of di?iculty in separation of parts and damage to
the battery terminal.
The previously mentioned relative motion between the
members 12 and 14 during movement of the lugs 18 and
cap screw 62 will simply be withdrawn farther than usual
and the bared stranded conductors can be shaped for
easy insertion into the rectangular con?nes of the recess
58 after which the cap screw 62 is tightened. Though
not so shown, in use the cap screw 62 can be easily short
ened by ?ling the end to such an extent that the head
thereof will seat ?ush against the raised portion 61 of the
boss 56 on proper engagement of the cap screw 62 with
the conductors 64-.
A modi?ed construction of the clamp member 14 of
FIGURE 2 is shown in FIGURE 6 which may in some
circumstances be deemed preferable to that of the mem
ber 14. The clamp member 70 shown in FIGURE 6 is
therefore to be considered as a substitute in the connector
19 for the previously described clamp member 14, with
all other portions of the connector 10 to remain unchanged
and to be used therewith. The only difference between
28. The ?nger 28 preferably is generally rectangular in
cross section and has a side surface 50 that is in sliding 35 the clamp member 711 and the clamp member 14 resides
in the concave surface area thereof. Whereas the clamp
and camming engagement with a surface 52 de?ning a
member 14 is provided with a single concave surface
portion of the periphery of the aperture 32. Recalling
30 having the same radius of curvature as the surface
the desiderata previously stated with respect to the angles
26 toward each other is a function of the cam means
constituted of the structure of the ear 20 and the ?nger
area 22, the clamp member 79 has two concave surface
subtended by the surface areas 22 and an and the rela
tive dimensions and geometries of the surface areas 22 40 areas 72 and 74 that are spaced apart and which have the
same center of curvature and the radius of curvature
and 30 shown in FIGURE 3, the camming surfaces 50
as that of body member 12 at 22. The areas 72 and 74
and 52 are inclined in order to effect the previously stated
are separated by an intervening concave surface area 76,
relative motion of the members 12 and 14 and particular
as shown, which has a radius of curvature less than that
ly to cause the mid-points of the arcs de?ned by the sur
of the areas 72 and '74, for example, such as the radius
face areas 22 and 38* to move directly in opposition to
of the battery terminal 54. Furthermore, the center of
each other. Obviously, the relative motion will be sub
curvature of area 76, the center of curvature of the areas
stantially as described with the structure shown in FIG
‘72 and 74, and the center of the arc of area 76 lie sub
URE 3 ‘as extension of the plane of the surface 50 of
stantially on a straight line. Again, the clamp member
the ?nger 28 passes for all practical purposes through the
centers of the arcs of the areas 22 and 30 as well as 50 70 is structurally identical to and of the same size as the
clamp member 14 except to the extent speci?cally already
through the centers of curvatures of such areas 22 and 36.
mentioned, so as to be used in lieu of the clamp member
FIGURE 4 can be compared to FIGURE 3 to show
14. It will be noted that substitution of the clamp mem
different relative positions of the clamp member 14 with
ber 7%} for the clamp member 14 in the connector 10
respect to the body member 12 upon the lugs 26 and 13
will result in the clamp member having surface areas
being in closer proximity to each other. In FIGURE 4
conformable to either of the terminals 48 or 54. It is
the connector 10 is shown with the nut 46 tightened down
considered within the scope of the present invention that
sufficiently that the surfaces 22 and an engage a battery
an intermediate portion of the concace extent of the area
terminal 54 that is relatively small as compared to the
22 can have. a lesser radius of curvature, and that this
battery terminal 48. Though it is preferred that as large
\an amount of surface area of the connector 11) engage 60 structural modi?cation can be used in addition to or in
lieu of the substitution of clamp member 71} for clamp
a terminal post as possible, it has been found that the ap
member 14.
plication of the connector 10 to a relatively small battery
The preferred embodiments of the invention have been
terminal such as shown at 54 is generally satisfactory
described in considerable detail in order to convey a full
mechanically and electrically for most practical uses.
The connector 10 is not only wellasuited for connection 65 and complete understanding of the principles involved,
and any narrowness in the scope of the invention is not
to a battery terminal, but also includes means for estab
tobe imputed therefrom. Numerous variations in struc
lishing a highly satisfactory connection both mechanically
ture have been indicated and it is obvious that many
and electrically to the conductors of a battery cable. The
others will immediately occur to those skilled in the art
means provided ‘for this purpose comprises the body mem
in the light of the foregoing detailed speci?cation. Ac
ber 12 having an integral generally rectangularly shaped
cordingly, the actual scope of the invention must be ascer
boss 56 having a generallyrectangularly shaped recess 53
tained upon reference to the appended claims.
therein that opens outwardly from the connector 10 from
I claim:
the portion 16, as shown. The boss 56 is, provided with
1. A battery terminal connector comprising an elec
a lateral opening ‘60 communicating with the recess 58,
with the wall thickness of the boss 56 being preferably 75 trically conductive body member that includes a portion
CA)
F533
5
having a concave surface area substantially coextensive
with and extending between ?rst and second margins of
such portion adapted to engage a battery terminal, said
body member including an integral lug adjacent the ?rst
margin of said portion, an electrically conductive clamp
member that includes a portion having an concave sur
face area substantially coextensive with and extending be
tween ?rst and second margins of such portion adapted to
engage a battery terminal, said clamp member including
an integral lug adjacent the ?rst margin of said portion
thereof, securing means for forcibly urging said lugs to
ward each other, and cooperating cam means carried by
the body member portion and the clamp member portion
adjacent their respective second margins for moving said
6
adjacent their respective second margins for moving said
concave surface areas toward substantially direct opposi
tion during operation of said securing means, said cam
means comprising an ear on the second margin of one
of said portions having an aperture therethrough, and a
?nger on the second margin of the other of said portions
extending through the aperture in the ear, with said car
being offset and overlying the second margin of the other
portion, and said ?nger being in slideable and in camming
engagement with the ear.
4. The combination of claim 1, wherein one of said
concaved surface areas is in part conformable to a refer
ence surface that is in turn circular in cross section along
its axial extent, and wherein the other of said concaved
concave surface areas toward substantially direct opposi 15 surface areas is at least in part conformable to a second
tion during operation of said securing means, said cam
reference surface that is similar to the ?rst-mentioned
means comprising an car on the second margin of one
reference surface though of lesser radius.
of said portions that is offset and overlaps the second
5. A battery terminal connector comprising an elec
margin of the other portion, said ear being apertured,
trically conductive body member that includes a portion
and a ?nger on the last-mentioned second margin slide
able through the aperture.
2. A battery terminal connector comprising ‘an elec
trically conductive body member that includes a portion
having a concave surface area extending between ?rst
and second margins of such portion adapted to engage
a battery terminal, said body member including an in
tegral lug adjacent the ?rst margin of said portion, said
body member including on the side thereof opposite the
concave surface area an integral boss having a recess
therein that opens outwardly in a direction extending
from the concave surface area of said body member por
tion, said boss having an opening communicating laterally
having a concave surface area extending between ?rst
and second margins of such portion adapted to engage
a battery terminal, said body member including an in
tegral lug adjacent the ?rst margin of said portion, an
electrically conductive clamp member that includes a por
tion having a concave surface area extening between ?rst
and second margins of such portion adapted to engage a
battery terminal, said clamp member including an in
tegral lug adjacent the ?rst margin of said portion there
of, securing means for forcibly urging said lugs toward
each other, and cooperating cam means carried by the
body member portion and the clamp member portion ad
jacent their respective second margins for moving said
with the recess, a cable engaging element threaded in the
concave surface areas toward substantially direct opposi
boss through the opening adapted to engage a cable With
tion during operation of said securing means, said cam
in the recess, an electrically conductive clamp member 35 means comprising an ear carried by the body member
that includes a portion having a concave surface area ex
portion having an aperture therethrough, with the second
tending between ?rst and second margins of such portion
adapted to engage a battery terminal, said clamp member
including an integral lug adjacent the ?rst margin of said
margin of said clamp member portion being interposed
portion thereof, securing means for forcibly urging said
extending through the aperture in the ear, said ?nger be
ing in slideable and camming engagement with the ear.
6. The combination or" claim 5, wherein said lugs are
lugs toward each other, and cooperating cam means car
ried by the body member portion and the clamp member
portion adjacent their respective second margins for mov
ing said concave surface areas toward substantially direct
opposition during operation of said securing means, said 45
cam means comprising an car on the second margin of
one of said portions that is offset and overlaps the second
margin of the other portion, said car being apertured, and
a ?nger on the last-mentioned second margin slideable
through the aperture.
3. A battery terminal connector comprising an elec
trically conductive body member that includes a portion
having a concave surface area substantially coextensive
with and extending between ?rst and second margins of
such portion adapted to engage a battery terminal, said
body member including an integral lug adjacent the ?rst
margin of said portion, an electrically conductive clamp
member that includes a portion having a concave surface
between said ear and the ?rst margin of the body mem
ber portion, and a ?nger on the clamp member portion
substantially parallel, and said ?nger includes a camming
surface inclined to the parallelism of the lugs.
7. The combination of claim 6, including said lugs hav
ing registering openings therethrough, said securing means
comprising a bolt extending through the openings in the
lugs, with at least one of said openings being larger than
the bolt whereby the bolt is not canted during oblique
translation of the clamp member caused by the cam means.
8. The combination of claim 7, wherein said bolt in
cludes a polygonal head, and one of said members hav
ing a shoulder engageable with the head to prevent rota
tion of the bolt.
9. The combination of claim 8, wherein at least one of
said concaved surface areas includes a pair of areas con
formable to a reference surface of one radius and an area
intermediate said pair of areas that is conformable to a
area substantially coextensive with and extending between
second reference surface of lesser radius.
?rst and second margins of such portion adapted to en 60
gage a battery terminal, said clamp member including
References Cited in the ?le of this patent
an integral lug adjacent the ?rst margin of said portion
FOREIGN PATENTS
thereof, securing means for forcibly urging said lugs to<
Canada ______________ __ Mar. 20, 1956
ward each other, and cooperating cam means carried by
522,794
the body member portion and the clamp member portion 65
571,060
‘Canada _________ _,__..__._ Feb. 24, 1959
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