U.S. patent number 3,848,080 [Application Number 05/451,326] was granted by the patent office on 1974-11-12 for ground wire clip.
This patent grant is currently assigned to Illinois Tool Works, Inc.. Invention is credited to Bradley J. Schmidt.
United States Patent |
3,848,080 |
Schmidt |
November 12, 1974 |
GROUND WIRE CLIP
Abstract
The present invention relates generally to ground wire clips for
attachment to wooden poles and the like, and more particularly to a
novel and very practical electrically nonconductive one piece
ground wire clip. Embodiments of the present invention disclosed
herein include an electrically nonconductive one piece clip having
an elongate shank section and a hook shaped head section integral
with one extremity of said shank section. The entering extremity of
the elongate shank section is relatively sharp to facilitate
driving the shank into a wooden workpiece. The hook shaped head
provides a conductor accomodating recess and means is provided in
the vicinity of the head for limiting the extent to which said
shank may be longitudinally driven into a workpiece. Barbs or teeth
disposed on opposite sides of the shank section are so arranged as
to reduce to a minimum the possible fracture or severance of wooden
fibers and function effectively to resist unauthorized or
unintentional retrograde movement or withdrawal of the shank.
Inventors: |
Schmidt; Bradley J. (East
Dundee, IL) |
Assignee: |
Illinois Tool Works, Inc.
(Chicago, IL)
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Family
ID: |
27014841 |
Appl.
No.: |
05/451,326 |
Filed: |
March 14, 1974 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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394691 |
Sep 6, 1973 |
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Current U.S.
Class: |
174/164; 174/159;
248/216.1; 411/485; 248/71; 411/456; 411/920 |
Current CPC
Class: |
F16B
15/02 (20130101); F16B 15/06 (20130101); H02G
7/205 (20130101); Y10S 411/92 (20130101) |
Current International
Class: |
F16L
3/04 (20060101); F16L 3/02 (20060101); H02G
7/20 (20060101); F16B 15/00 (20060101); F16B
15/02 (20060101); F16B 15/06 (20060101); H01b
017/00 (); F16b 015/02 (); F16b 015/06 () |
Field of
Search: |
;174/4CC,159,164,170
;52/155,680 ;85/5R,1R,21,28,29,49,DIG.2 ;135/15PE ;238/366
;248/71,216,217 ;256/48 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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849,438 |
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Sep 1952 |
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DT |
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916,048 |
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Jan 1963 |
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GB |
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Primary Examiner: Askin; Laramie E.
Attorney, Agent or Firm: Beart; Robert W. Benno; Edward
L.
Parent Case Text
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of applicant's
application Ser. No. 394,691, filed Sept. 6, 1973, now abandoned.
Claims
I claim:
1. A clip capable of being hammer-driven into a wooden pole to hold
a ground wire against said pole, said clip comprising an integral
elongated shank portion and a head portion of an electrically
nonconductive plastic material, said shank portion being
substantially rectangular in transverse cross-section and the side
walls thereof tapering from said head portion to a chisel point at
the other end thereof, a plurality of barbs on two opposite side
walls of said shank portion, said barbs on each of said two
opposite side walls arranged in a spaced apart relationship
longitudinally of said shank portion and each of said barbs
extending substantially completely transversely across said side
walls, a plurality of recesses in the other two opposite side walls
of said shank portion, said recesses arranged in a spaced apart
relationship longitudinally of said shank portion and spanning said
barbs to render at least the ends of said barbs deflectable
inwardly of said shank portion, said head portion including a
central driving section in axial alignment with said shank portion
and a hook section and a stop section, said hook and stop sections
arranged on opposite sides of said driving section and extending
transversely outwardly of said clip, said stop section including a
shoulder extending outwardly of said clip and terminating in a
transverse plane substantially including the longitudinally inner
end of said head portion and an integral web perpendicularly
arranged between said shoulder and one side of said driving
section, said hook section comprising a hook portion directed
outwardly from the head end of said driving section and
longitudinally of said driving section and frangible web means
integrally interconnected between said driving section and said
hook portion.
2. A clip as defined in claim 1, wherein said frangible web means
terminates substantially in said transverse plane in which said
shoulder of said stop section terminates.
3. A clip as defined in claim 1, wherein said frangible web means
of said hook section is of increasing thickness in a direction
toward the head end of said clip.
4. A clip as defined in claim 1, wherein said two opposite side
walls of said shank portion carrying said barbs are substantially
wider than said other two opposite side walls of said shank
portion.
Description
SUMMARY OF THE INVENTION
It has been found that when commercially available, metallic ground
wire securing clips are employed on wooden poles, the area in the
vicinity of the clips is at times subjected to heat of such
intensity as to actually cause burning of the wood adjacent the
clips. Induced surges of high voltage conditions in the ground wire
causing such intense heat may result from electrical storms and
other voltage fluctuations induced by the conductors supported by
the pole. To counteract this tendency of wood fibers to burn in the
vicinity of conventional grounding clips, the present invention
contemplates the provision of an electrically nonconductive clip
which may be driven into a wooden pole.
More specifically, the present invention is directed to an improved
electrically nonconductive clip of the general type referred to
above which may be driven into a wooden pole without tearing or
fracturing wood fibers, thereby assuring permanent attachment of
ground wires and the like to said pole.
It is a further object of the present invention to provide a novel,
inexpensive fastener or clip for ground wire and the like which is
so arranged as to limit the extent to which an elongate clip shank
may be longitudinally driven into structures such as wooden
poles.
The present invention also contemplates a unique, efficiently
operable clip having a novel shank arrangement which facilitates
the ease with which the clip shank may be driven into a wooden pole
and upon complete insertion will prevent unintentional retrograde
movement or withdrawal of said shank .
BRIEF DESCRIPTION OF THE DRAWING
The foregoing and other objects and advantages will be more
apparent in connection with the accompanying drawing wherein:
FIG. 1 illustrates the manner in which clips or fasteners of the
present invention are distributed along a conventional wooden
transmission pole for securing a ground wire to the pole;
FIG. 2 is a perspective view of a ground wire clip of one type
contemplated by the present invention;
FIG. 3 discloses the clip of FIG. 2 in operative association with a
wooden pole for securing a ground wire to the pole;
FIG. 4 is a horizontal sectional view taken substantially along the
line 4--4 of FIG. 3;
FIG. 5 is an elevational view taken from the right side of FIG.
4;
FIG. 6 is a plan view of another embodiment of the clip of the
subject invention;
FIG. 7 is a side view of the clip shown in FIG. 6;
FIG. 8 is an end view of the clip of FIG. 6;
FIG. 9 is a view of the clip of FIGS. 6-8 in association with a
wooden pole and a ground wire; and
FIG. 10 is an end view of the assembly of FIG. 9.
DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION
Referring to the drawing more in detail wherein like numerals have
been employed to designate similar parts throughout the various
views, it will be seen that one embodiment of a ground wire clip
contemplated by the present invention is designated generally by
the numeral 10. The clip 10 is formed of suitable electrically
nonconductive material such as plastic material exhibiting
sufficient strength to permit a shank 12 thereof to be
longitudinally hammer-driven into a conventional wooden
transmission line pole 14. The entering extremity 16 of the shank
12 is relatively sharp so as to facilitate initial penetration and
subsequent driving of the shank into the wooden workpiece or pole
14.
The opposite extremity of the shank 12 is provided with a hook
shaped head 18. The head 18 projects laterally from the clip shank
12 and is formed with an aperture 20 for accommodating a
conventional ground wire or conductor 22. The hook shaped head 18
also presents a relatively flat surface 24 against which driving
pressure, as by means of a hammer, may be applied to force the clip
10 into the pole 14.
Extending from opposite sides of the shank 12 is a plurality of
teeth or barbs 26. Each barb 26 is defined by acutely intersecting
surfaces which will readily permit penetration of the shank 12 into
the workpiece 14, and upon complete insertion the teeth surfaces
facing the driven end of the clip will aggressively dig into the
workpiece and prevent unauthorized or unintended withdrawal of the
clip. Attention is directed to the fact that the teeth or barbs 26
are located in the vicinity of complementary recesses 28. With this
structural arrangement, the shank 12 provides sufficient transverse
yieldability to permit the barbs 26 to resiliently resist
penetration of the workpiece 14. Once the shank 12 has been
completely driven into the wooden workpiece or pole 14, the
resiliency of the shank stock on opposite sides of each of the
recesses 28 serves to urge the barbs 26 into firm impingemnt or
locking engagement with the wood fibers.
In order to control the amount of pressure exerted by the hook
shaped head 18 against the periphery of the ground wire or
conductor 22, shoulders 30 are provided in the vicinity of the
driven extremity of the clip. These shoulders are so dimensioned as
to bear against the periphery of the pole 14 after the hook shaped
head 18 has been firmly clamped or tightened against the periphery
of the ground wire 22. Thus, by controlling the extent to which the
clip shank may be driven into the workpiece, the possibility of
excessive pressure against the ground wire is precluded. An
aperture 32, FIGS. 2 and 3, completely transverses the head
extremity of the clip or fastener. It will also be noted that the
depth of the ground wire accommodating recess 20 is such as to
permit the relatively sharp free extremity of the hook shaped head
section to bite into the periphery of the hole 14, FIG. 3. With
this arrangement, the head section 18 will be further secured
against lateral displacement. This assures the maintenance of firm
clamping pressure against the ground wire 22.
From the foregoing it will be apparent that the present invention
contemplates the provision of a very simple yet highly efficient
and novel one piece ground wire clip. The design of the clip
disclosed herein is such as to enable the device to be molded from
suitable plastic material, thereby greatly reducing manufacturing
costs. Obviously, the electrically non-conductive material such as
plastic used in the fabrication of the present clip must be
sufficiently rigid to withstand heavy hammer blows against the
surface 24 of the head section 18. The above-described arrangement
of barbs is such as to reduce to a minimum the possibility of wood
fiber fractures. The arrangement of longitudinally disposed
recesses in the shank with the barbs strategically located with
respect to said recesses provides the desired degree of lateral
flexibility in the shank. In the disclosed embodiment, the shank of
the clip increases gradually in diameter from the entering
extremity to the head section. The possibility of applying
excessive clamping force to the ground wire is precluded due to the
pressure of the shoulders in the vicinity of the head section.
The clip disclosed herein is formed with a chisel-like entering
edge. This chisel-like edge when applied to a wooden transmission
line pole is vertically disposed and thus extends in a direction
substantially parallel with the wood fibers of the pole. As a
result, the entering edge will not sever said fibers as the clip is
hammer driven into position.
The second embodiment of the invention, shown in FIGS. 6-10, is
designated generally by the numeral 40. The clip 40 is also formed
of a suitable electrically non-conductive material such as a
plastic material exhibiting sufficient strength to permit the clip
40 to be hammer-driven into a conventional wooden power
transmission pole 41.
The clip 40 comprises a shank portion 42 and a head portion 43. As
may be seen in FIGS. 6-8, the shank portion 42 is substantially
rectangular in transverse cross-section, and the four sides of the
shank portion 42 are tapered to a chisel point 44. The two broader
sides of the chisel point 44 taper substantially to a sharp point
so as to facilitate initial penetration and subsequent driving of
the clip 40 into the wooden pole 41.
The two broader sides of the shank portion 42 are provided with
barbs or teeth 45. Each barb includes an inclined surface directed
downwardly and inwardly of the shank portion 42 in a direction
toward the point 44 and a transversely disposed surface. Thus, the
barbs 45 are shaped to permit relatively easy penetration of the
shank portion 42 into the wooden pole 41 but will resist easy
withdrawal of the shank portion 42 from the pole 41.
The two narrower sides of the shank portion 42 are provided with
recesses 46, 47 and 48. The recesses 46, 47 and 48 span the barbs
45 longitudinally of the shank portion 42 and produce sufficient
resiliency in the shank portion 42 in the areas at each end of the
barbs to permit flexing of the ends of the barbs as the clip 40 is
driven into the pole 41.
The head portion 43 of the clip 40 substantially comprises three
sections, a hook section 50, a driving section 51, and a stop
section 52. The driving section 51 is in axial alignment with the
shank portion 42, and the hook section 50 extends from one side of
the driving section 51, while the stop section 52 extends outwardly
from the other or opposite side of the driving section 51. As may
be seen in FIGS. 6-8, the hook section 50 and the stop section 52
extend outwardly of the driving section 51 in a plane extending
longitudinally of the clip 40 and perpendicularly through the two
broader sides of the shank portion 42.
The hook section 50, the driving section 51 and the stop section 52
terminate substantially in the same transverse plane at the
intersection of the head portion 43 with the shank portion 42 of
the clip 40.
The hook section 50 includes a hook shaped portion 50a and two web
sections 50b and 50c. The web portions 50b and 50c extend between
the hook portion 50a and the driving section 51, with the web
section 50b disposed contiguous to web portion 50c and adjacent web
portion 50c in a direction toward the shank portion 42. The web
portion 50b is substantially thinner than web portion 50c, as may
be seen in FIGS. 7 and 8. The web portions 50b and 50c are
frangible with the web portion 50b being obviously substantially
more frangible than web portion 50c. As clip 40 is driven into a
pole 41 as shown in FIG. 9, the web portions 50b and 50c will
fracture about a ground wire such as a ground wire 54 to the extent
necessary to accommodate the ground wire 54 dependent upon the size
of the ground wire 54. Because of the difference in thickness of
the web portions 50b and 50c, ground wires of smaller diameters
will be firmly encircled by the web portion 50b without damaging
the smaller ground wires. Larger diameter wires will cause some
encircling fracturing of the web portion 50c in addition to
fracturing of the web portion 50b. Larger diameter ground wires in
causing fracturing of the web portion 50c will not be damaged by
web portion 50c. The driving section 51 has a broadened head
portion to absorb the blows of a hammer and weight reducing
depressions 51a, 51b and 51 c in each side thereof.
The stop section 43 comprises a transversely outwardly extending
shoulder 52a and an integral longitudinally extending web portion
52b. The stop section 52 serves to prevent the clip 40 from being
driven too deep into the pole 41.
While for purposes of illustration, specific embodiments of the
invention are disclosed herein, it should be understood that
modifications and changes are contemplated which come within the
spirit and scope of the appended claims.
* * * * *