U.S. patent application number 10/788726 was filed with the patent office on 2004-11-18 for base for use with a pole puller.
Invention is credited to Booker, Brian A., Brittain, Carl C., Piotrowski, James P..
Application Number | 20040227133 10/788726 |
Document ID | / |
Family ID | 34082928 |
Filed Date | 2004-11-18 |
United States Patent
Application |
20040227133 |
Kind Code |
A1 |
Brittain, Carl C. ; et
al. |
November 18, 2004 |
Base for use with a pole puller
Abstract
A base (108) for supporting a pole puller (110) utilized to
manipulate a pole (186) includes first and second bearing arms
(112, 114) configured to rest on a surface (60) with the pole (186)
located between the first and second bearing arms (112, 114). A
cross member (128) interconnects the first and second bearing arms
(112, 114) and a housing (138) extends from the cross member (128)
into which the pole puller (110) is seated. A flexible member (62)
coupled to a ram (174) of the pole puller (110) encircles the pole
(186). An upward force (72) is imposed on the flexible member (62)
via the ram (174) to extract the pole (186) from a fixed, upright
position in the ground (60). The support provided by the base (108)
prevents the pole puller (110) from kicking into the ground as the
upward force (72) is imposed.
Inventors: |
Brittain, Carl C.; (Dewey,
AZ) ; Booker, Brian A.; (Glendale, AZ) ;
Piotrowski, James P.; (Scottsdale, AZ) |
Correspondence
Address: |
Lowell W. Gresham
Meschkow & Gresham, PLC
Suite 409
5727 North Seventh Street
Phoenix
AZ
85014
US
|
Family ID: |
34082928 |
Appl. No.: |
10/788726 |
Filed: |
February 26, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
10788726 |
Feb 26, 2004 |
|
|
|
10435181 |
May 9, 2003 |
|
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Current U.S.
Class: |
254/30 |
Current CPC
Class: |
B66C 1/62 20130101 |
Class at
Publication: |
254/030 |
International
Class: |
E21B 019/00 |
Claims
What is claimed is:
1. A base for supporting a pole puller utilized to manipulate a
pole, said base comprising: a first bearing arm; a second bearing
arm in spaced-apart relation with said first bearing arm, said
first and second bearing arms being configured to rest on a surface
with said pole located between said first and second bearing arms;
a cross member interconnecting said first and second arms; and a
housing extending from said cross member, said housing being
configured to support a body of said pole puller.
2. A base as claimed in claim 1 wherein: each of said first and
second bearing arms has a front end and a rear end; and said base
further comprises a rear support extending between and coupled to
each of said first and second bearing arms at said rear end.
3. A base as claimed in claim 1 wherein each of said bearing arms
is a U-channel having upwardly directed legs.
4. A base as claimed in claim 1 further comprising a strut coupled
to each of said housing and said first bearing arm.
5. A base as claimed in claim 4 wherein said strut is a first
strut, and said base further comprises a second strut coupled to
each of said housing and said second bearing arm.
6. A base as claimed in claim 4 wherein said housing has a top end,
said first bearing arm has a front end, said strut is attached to
said housing at said top end, and said angle brace is attached to
said first bearing arm at said front end.
7. A base as claimed in claim 4 wherein said first bearing arm
includes a brace arranged transverse to a longitudinal dimension of
said first bearing arm, said strut being coupled to said brace.
8. A base as claimed in claim 1 further comprising ring members
extending from a top surface of said first and second bearing arms
for attachment of a hoist mechanism for facilitating placement of
said base.
9. A base as claimed in claim 1 wherein said cross member comprises
an attachment interface configured for attachment of said pole
puller to said cross member.
10. A base as claimed in claim 9 wherein said pole puller includes
a first and a second bracket extending from a bottom of said pole
puller, and said attachment interface comprises a horizontally
disposed shaft configured to enable said bottom of said pole puller
to be seated upon said shaft such that said first and second
brackets reside on opposing surfaces of said shaft relative to a
width of said shaft.
11. A base as claimed in claim 9 further comprising a pin member
configured to be directed through a first hole in said first
bracket, beneath said horizontally disposed shaft, and through a
second hole in said second bracket.
12. A base as claimed in claim 1 wherein said body of said pole
puller is generally cylindrically-shaped, and said housing is an
arcuate member configured to conform to said cylindrically-shaped
body.
13. A base as claimed in claim 1 wherein said housing is configured
to partially surround said body of said pole puller at a
pole-facing side of said pole puller.
14. A system for manipulating a pole comprising: a pole puller
having a generally-cylindrical body and a ram extendable from a top
of said body; and a base for supporting said pole puller, said base
including: a first bearing arm: a second bearing arm in
spaced-apart relation with said first bearing arm, said first and
second bearing arms being configured to rest on a surface with said
pole located between said first and second bearing arms; a cross
member interconnecting said first and second arms; and an arcuate
housing extending from said cross member and partially surrounding
said body at a pole-facing side of said body, said arcuate housing
conforming to said cylindrically-shaped body.
15. A system as claimed in claim 14 further comprising: a first
strut coupled to a top end of said housing and a first front end of
said first bearing arm; and a second strut coupled to said top end
of said housing and a second front end of said second bearing
arm.
16. A system as claimed in claim 14 wherein said cross member
comprises an attachment interface to which said pole puller is
attached.
17. A system as claimed in claim 16 wherein: said pole puller
includes a first and a second bracket extending from a bottom of
said pole puller; said attachment interface comprises a
horizontally disposed shaft onto which said bottom of said pole
puller is seated such that said first and second brackets reside on
opposing surfaces of said shaft relative to a width of said shaft;
and said base further comprises a pin member directed through a
first hole in said first bracket, beneath said horizontally
disposed shaft, and through a second hole in said second
bracket.
18. A system as claimed in claim 14 further comprising: a flexible
member coupled to said ram of said pole puller; and a pole bridle
including plates configured for placement in spaced-relation about
said pole, and retaining members coupled to an outer surface of
said plates, said retaining members being configured to retain said
flexible member in encircling-relation about said pole wherein an
upward force imposed on said flexible member via said ram creates a
transverse force on said plates to direct said plates against said
pole.
19. A method for manipulating a pole utilizing a pole pulling
system that includes a pole puller having a body and a ram
extendable from a top of said body, a base for supporting said pole
puller, a flexible member coupled to said ram of said pole puller,
and a pole bridle, said method comprising: placing said base on a
surface with said pole being located between first and second
bearing arms of said base; encircling said pole with plates of said
pole bridle; retaining said flexible member in encircling-relation
about said pole via retaining members coupled to an outer surface
of each of said plates; actuating said ram to impose an upward
force on said flexible member thereby creating a transverse force
on said plates to facilitate manipulation of said pole.
20. A method as claimed in claim 19 wherein said pole is sheared
proximate said surface with a butt of said pole remaining below
said surface, and said method further comprises excavating surface
material proximate said butt so that said encircling occurs below
said surface, and said actuating operation causes said sheared pole
to be pulled.
Description
RELATED INVENTION
[0001] The present invention is a continuation in part (CIP) of
"Pole Bridle," U.S. patent application Ser. No. 10/435,181, filed 9
May 2003, which is incorporated by reference herein.
TECHNICAL FIELD OF THE INVENTION
[0002] The present invention relates to the field of utility pole
maintenance. More specifically, the present invention relates to a
base for use with a pole pulling mechanism that functions to
extract poles from an embedded location in the earth.
BACKGROUND OF THE INVENTION
[0003] Large, elongate poles, often having a tapered shaft, are
typically used as support structures for utility lines, billboards,
large area lighting, antenna systems, and so forth. These poles
sometimes need to be removed for any number of reasons. For
example, when utilities are being placed underground or when an
electrical line is being decommissioned, the poles are removed so
that the land can be reclaimed for another purpose, such as for
building roadways. The old poles may also be replaced when the
poles have lost structural integrity.
[0004] When a pole, embedded in the earth and used as a support
structure, needs to be removed, a pole puller is sometimes
utilized. This device typically includes a hydraulic cylinder
mounted to a base, with the cylinder aligned vertically adjacent
the pole to be removed. The cylinder is affixed to the pole with a
chain wrapped around the pole. Repeated actuations of the cylinder
permit the pole to be extracted in small increments. Once the pole
is extracted, the pole may be reused or discarded.
[0005] When used with a wooden pole, the links of the chain tend to
bite into a wood to largely prevent the chain from rolling or
slipping. Unfortunately, when such an apparatus is used to remove a
steel pole, the chain cannot readily bite into the steel. Thus, the
chain may slip, thereby making extraction of steel poles very
difficult. If the chain is forced tight enough to bite into the
steel, the hoop strength of the steel pole may be compromised. Hoop
strength is a physical property that describes the ability of a
tube, in this case the steel pole, to withstand internal pressure,
bending force, and crushing force. Accordingly, if the hoop
strength of the steel pole is compromised, the pole may be more
likely to fail when a load is placed on the pole, leading to
potentially costly equipment damage and significant safety
issues.
[0006] Another problem with the use of pole pullers is that the
chain must be loosened from the pole by a workman along with each
downward (return) stroke of the cylinder. The workman must then
work the chain down the pole prior to each upward stroke of the
cylinder. Obviously, such activity increases the time required for
pole extraction. Moreover, such activity is hazardous for the
workman whose task it is to manipulate the chain. Indeed, fingers
have been broken and even amputated due to the tension imposed on
the chain by the pole puller.
[0007] For the reasons discussed above, the use of a pole puller
with a chain has not previously been suitable for the removal of a
steel pole. Therefore, excavation around the pole to the bottom, or
butt, of the pole has been adopted as an alternative technique for
pole removal. Once excavation is complete, the pole can then be
pulled out with the boom on a boom truck. Unfortunately, such a
technique is costly, due to the undesirably long time it takes to
excavate and remove a single pole, due to the costly digging
equipment needed to remove a steel pole, and due to the likelihood
of damage to the pole by the excavating equipment. In addition,
while this method may work satisfactorily in rural areas, it
presents many problems and hazards if attempted in an urban
setting, where underground utilities, pavement, etc., can limit its
use. Also, after having extracted a pole by this means, it is
thereafter difficult to insure that a new pole placed in the
original hole will be firmly held in place, as the hole is, in
effect, twice as big as was necessary.
[0008] The use of pole pullers has long been hindered by a problem
that occurs when pulling either wood or steel poles. That is, when
the ram of the pole puller is actuated, the tension between the ram
and the pole can cause the puller base to kick (i.e., dig) into the
ground, capsizing the pole puller, and disrupting the pull. Such a
situation can undesirably lengthen the time required to pull a pole
and cause equipment damage and/or personnel injury. This problem is
exacerbated when the pole has been sheared off a ground level
because a conventional pole puller must abut the pole to be pulled.
If there is no pole to abut, the puller base has an even greater
tendency to kick into the ground. Accordingly, pole pullers cannot
be utilized to pull sheared poles. Therefore, costly excavation
around the pole to the bottom of the pole is typically employed for
the removal of sheared poles.
[0009] Another method for removing old poles involves the use of a
boom truck. The boom truck is backed up to the pole to be removed,
and the boom is secured to the pole. By making repeated upward
jerks with the boom, some poles, if not too tightly embedded, could
be removed. However, this method is extremely disadvantageous in
that it places severe stress on the most expensive equipment
typically owned by utility or sign companies--the boom truck. In
particular, with repeated use, the boom tends to bend or break at
the interface between the boom and the truck bed. In addition,
winch lines can snap, causing equipment damage and/or personnel
injury.
[0010] Faced with these difficulties, some companies have chosen to
cut off the pole and leave a "butt" in place, finding it to be less
expensive to purchase a new pole rather than attempting to extract
the old pole and reuse it. This is obviously a wasteful practice,
since the pole cannot then be reused. In addition, environmental
concerns arise when leaving a treated wooden pole "butt" in place.
With regard to steel poles, companies and the general public may
find it quite unacceptable to cut off a steel pole and leave the
steel pole "butt" in place. As such, this practice is not a viable
option if a reasonably practicable alternative is available.
[0011] Accordingly, what is needed is a mechanism for facilitating
safe and economical removal of old poles, especially of steel
poles, and for removal of sheared poles.
SUMMARY OF THE INVENTION
[0012] Accordingly, it is an advantage of the present invention
that a base for supporting a pole puller is provided.
[0013] It is another advantage of the present invention that a pole
bridle is provided that is operable with the base and pole puller
for manipulation of a pole.
[0014] It is another advantage of the present invention that a
base, pole puller, and pole bridle are provided that facilitate the
extraction of a sheared pole.
[0015] Yet another advantage of the present invention is that a
base for use with a pole puller is provided that is of simple
construction, is sturdy, and is readily maneuvered into place.
[0016] The above and other advantages of the present invention are
carried out in one form by a base for supporting a pole puller
utilized to manipulate a pole. The base includes a first bearing
arm and a second bearing arm in spaced-apart relation with the
first bearing arm. The first and second bearing arms are configured
to rest on a surface with the pole being located between the first
and second bearing arms. A cross member interconnects the first and
second arms, and a housing extends from the cross member, the
housing being configured to support a body of the pole puller.
[0017] The above and other advantages of the present invention are
carried out in another form by a method for manipulating a pole
utilizing a pole pulling system. The pole pulling system includes a
pole puller having a body and a ram extendable from a top of the
body, a base for supporting the pole puller, a flexible member
coupled to the ram of the pole puller, and a pole bridle. The
method calls for placing the base on a surface with the pole being
located between first and second bearing arms of the base. The pole
is encircled with plates of the pole bridle. The method further
calls for retaining the flexible member in encircling-relation
about the pole via retaining members coupled to an outer surface of
each of the plates, and actuating the ram to impose an upward force
on the flexible member thereby creating a transverse force on the
plates to facilitate manipulation of the pole.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] A more complete understanding of the present invention may
be derived by referring to the detailed description and claims when
considered in connection with the Figures, wherein like reference
numbers refer to similar items throughout the Figures, and:
[0019] FIG. 1 shows a front view of a pole bridle;
[0020] FIG. 2 shows a highly simplified top view of a circular pole
showing a configuration of plates of the pole bridle of FIG. 1
encircling the pole;
[0021] FIG. 3 shows a side view of one of a number of plates and
retaining members of the pole bridle of FIG. 1;
[0022] FIG. 4 shows a side view of the pole encircled by the pole
bridle of FIG. 1;
[0023] FIG. 5 shows a front view of an alternative pole bridle;
[0024] FIG. 6 shows a highly simplified top view of a hexagonal
pole showing a configuration of plates of the pole bridle of FIG.
5;
[0025] FIG. 7 shows a highly simplified top view of a hexagonal
pole showing a configuration of angled plates of another pole
bridle;
[0026] FIG. 8 shows a perspective view of a base for supporting a
pole puller in accordance with a preferred embodiment of the
present invention;
[0027] FIG. 9 shows a partial side view of a pole puller;
[0028] FIG. 10 shows a partial rear view of the pole puller coupled
with the base of FIG. 8; and
[0029] FIG. 11 shows a perspective view of the base of FIG. 8 and a
pole puller being utilized with a pole bridle to remove a sheared
pole.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0030] Referring to FIGS. 1-3, FIG. 1 shows a front view of a pole
bridle 20 in accordance with a preferred embodiment of the present
invention. FIG. 2 shows a highly simplified top view of a circular
pole 22 showing a configuration of plates 24 of pole bridle 20
encircling pole 22, and FIG. 3 shows a side view of one of a number
of plates 24 and retaining members 26 of pole bridle 20. Pole 22
may be fabricated from any of a number of materials, such as wood,
steel, concrete, fiberglass, and so forth. Pole bridle 20 functions
to facilitate the extraction of pole 22 by a hoist mechanism, such
as a conventional pole puller (not shown). In particular, pole
bridle 20 enables the use of a conventional pole puller for
removing steel poles.
[0031] One each of retaining members 26 is coupled to an outer
surface 28 of one each of plates 24. Plates 24 are desirably
manufactured from steel, and exhibit a rectangular shape having a
length 30 that is greater than a width 32. For example, length 30
may be approximately eighteen inches and width 32 may be
approximately five and one half inches. In addition, plates 24 are
concave to accommodate the curvature of circular pole 22.
[0032] Each of plates 24 includes a first region 34 and a second
region 36, first region 34 exhibits a first thickness 38 that is
greater than a second thickness 40 of second region 36. For
example, first thickness 38 of first region 34 may be approximately
one inch, and second thickness 40 of second region 36 may be
approximately three eighths of an inch. Retaining member 26 is
coupled to plate 24 at first region 38. The additional thickness at
first region 34 provides strength and rigidity to plates 24 for the
attachment of retaining member 26, while the thinner dimension of
plates 24 at second region 36 reduces the overall weight of plates
24. Those skilled in the art will recognize that plates 24 may also
be fabricated having the same thickness throughout their lengths
and widths. As shown, pole bridle 20 includes four plates 24.
However, it will become apparent in the ensuing discussion, that
pole bridle 20 may be adapted to include less than or more than
four of plates 24.
[0033] Each of plates 24 also includes an eye 42 extending from
outer surface 28. Linking means, in the form of a chain 44 is
directed through each eye 42 of each of plates 24. Chain 44
includes a first end 46 and a second end 48. A connector 50 is
secured to first end 46 and couples first end 46 to second end 48,
as discussed below.
[0034] Plates 24 include an inner surface 52 on a side opposite
outer surface 28 of each of plates 24. A slip-resistant material 54
may optionally be adhered to inner surface 52. In a preferred
embodiment, slip-resistant material 54 is a spray- or brush-on
coating such as, polyurethane, rubber, and the like. Slip-resistant
material 54 forms a permanent bond with inner surface 52 and forms
a non-skid, non-abrasive surface texture for protecting pole 22
from damage by plates 24.
[0035] In an exemplary embodiment, retaining members 26 are
conventional weld-on lift hooks, such as those manufactured by the
Crosby group, Inc., Tulsa, Okla. 74101. Retaining members 26 are
bonded by welding to outer surface 28 of plates 24. Latch means, in
the form of a heavy duty latch 54 interlocks with a hook tip 56 of
each weld-on lift hook. Weld-on lift hooks are designed for
attachment to mobile lifting equipment and typically have a working
load limit of one to ten metric tons. Those skilled in the art will
recognize that other retaining devices may be utilized in place of
the weld-on lift hooks that are rated with high working load limits
and have an opening through which a flexible member (discussed
below) of a hoist mechanism, such as a pole puller (discussed
below), may be directed. For example, a retaining device might be a
weld-on or bolt-on ring or other such capturing member.
[0036] FIG. 4 shows a side view of pole 22 encircled by pole bridle
20. As shown, a butt 58 of pole 22 is in a fixed, embedded upright
position in the ground 60. In operation, an operator places pole
bridle 20 about pole 22 with inner surface 52 (FIG. 2) facing pole
22, and length 30 (FIG. 1) of plates 24 axially aligned with pole
22. Plates 24 are spaced apart from one another about pole 22 at
approximately equal distances. Connecter 50 is then coupled to
second end 48 of chain 44 to loosely retain plates 24 about pole
22. As such, chain 44 temporarily holds pole bridle 20 in place
about pole 22.
[0037] Once pole bridle 20 is loosely secured in place, a flexible
member, in the form of a chain 62, is directed through retaining
members 26. Chain 62 may be a high strength logging, or skidding,
chain such as those utilized in connection with a conventional pole
pullers. Alternatively, other approved flexible members may be
employed, such as, a braided steel cable, a stranded steel cable,
and so forth. Chain 62 is directed through each of retaining
members 26 to encircle pole 22. An eye element 64 of chain 62 is
then used to secure an end 66 of chain 62 to itself. More
specifically, end 66 is coupled to eye element 64, and chain 62 is
routed through a center opening 67 of eye element 64. As such,
retaining members 26 retain chain 62 in an encircling-relation
about pole 22.
[0038] A second end 68 of chain 62 is secured to a hoist mechanism
70. In a preferred embodiment, hoist mechanism 70 is a conventional
pole puller, only a portion of which is shown for simplicity of
illustration. Pole puller 70 desirably imparts a generally upward
lift force to extract pole 22, while a boom (not shown) of a boom
truck may be used to move pole 22 once it has been extracted. Pole
pullers for large, elongate poles, typically used as support
structures for utility lines, billboards, large area lighting,
antenna systems, and so forth, are manufactured by, for example,
Fairmont Hydraulics of Fairmont, Minn., and Thiermann Industries,
Inc. of Cedarburg, Wis.
[0039] Once chain 62 is secure, a generally upward force,
represented by an arrow 72, is imposed on chain 62. That is, pole
puller 70 is actuated to begin the extraction of pole 22 from the
ground 60. Upward force 72 imposed on chain 62 creates an inwardly
directed transverse force, represented by an arrow 74, on plates
24. That is, as chain 62 is pulled upward, chain 62 held by
retaining members 26 tightens about pole bridle 20, thus drawing
plates 24 snuggly against pole 22.
[0040] The use of plates 24 between chain 62 and pole 22 prevents
chain 62 from biting into and damaging pole 22. In addition, first
thickness 38 (FIG. 3) at first region 34 (FIG. 3) of plates 24
serves to hold chain 62 away from pole 22, and limit damage by
chain 62 to pole 22. The inward directed transverse force 74 is
distributed across the surface area of inner surface 52 (FIG. 3) of
each of plates 24. Moreover, as upward force 72 increases, so to
does transverse force 74. This distributed transverse force 74
causes pole bridle 20 to grip pole 22 largely preventing plates 24
from slipping along pole 22. This distribution of transverse force
74 is particularly advantageous when pole 22 is fabricated from
steel because the distribution of transverse force 74 about pole 22
prevents the tubular steel pole from collapsing during
extraction.
[0041] When the cylinder (not shown) of pole puller 70 has reached
its maximum upward stroke, thus extracting pole 22 by an increment
of, for example, fifteen inches, pole puller 70 begins its downward
(return) stroke. The downward stroke causes a release of upward
force 72 on chain 62. This release of upward force 72 causes an
associated release of transverse force 74. As such, pole bridle
loosens and readily slides down pole 22 for repositioning prior to
the next upward stroke of the pole puller. Accordingly, chain 62
need not be manipulated by a workman along with the downward stroke
of the cylinder and prior to the next upward stroke. Thus,
significant savings, in terms of time, equipment, and labor costs,
is achieved through the use of pole bridle 20. Moreover, increased
personnel safety is achieved because a workman does not undertake
the hazardous activity of manipulating chain 62 in response to
downward and upward strokes of the pole puller. Repeated actuations
of the pole puller can then be efficiently and safely performed to
extract pole 22. Once pole 22 is extracted, pole 22 may be reused
elsewhere.
[0042] Referring to FIGS. 5-6, FIG. 5 shows a front view of a pole
bridle 76 in accordance with an alternative embodiment of the
present invention. FIG. 6 shows a highly simplified top view of a
hexagonal pole 78 showing a configuration of plates 80 of pole
bridle 76. Pole bridle 76 is adapted to facilitate the extraction
of pole 78 having flat sides 82. Pole 78 is shown as having only
six sides for simplicity of illustration. Those skilled in the art
will recognize that a flat sided pole may have more or less than
eight sides. In addition, pole bridle 76 includes only three plates
80 for simplicity. Like pole bridle 20, pole bridle 76 may include
more than three plates 80.
[0043] Retaining members 26 of pole bridle 76 are coupled to plates
80. Chain 62 of a hoist mechanism is shown directed through
retaining members 26. Each of plates 80 also includes eyes 42
through which chain 44 is directed for loosely retaining pole
bridle 76 about pole 22 (FIG. 4). Plates 80 exhibit a planar, or
flat, shape, as opposed to the convex shape of plates 24 (FIG. 1)
of pole bridle 20 (FIG. 1). Accordingly, a large surface area of an
inner surface 84 of plates 80 will contact flat sides 82 of pole 78
when upward force 72 (FIG. 4) is imposed on chain 62.
[0044] Pole bridle 76 further includes linking means, in the form
of chains 86 securing plates 80 to one another in aligned-relation.
The "aligned-relation" refers to chains 86 securing each of plates
80 to one another along corresponding longitudinal edges 88, with
the exception of one pair of plates 24. Chains 86 hold plates 80 of
pole bridle 76 together for easier storage and handling when pole
bridle 76 is not in use, and when pole bridle 76 is first placed on
pole 78 prior to the interconnection of chain 44.
[0045] Chains 86 are shown as a fixed length of three links.
However, chains 86 may be adjustable in length by adding a clasp
and additional links to accommodate varying sizes of poles.
Furthermore, plates 80 and chain 86 may be configured so that
additional plates 80 may be attached. By way of example, a total of
six plates 80 may be utilized so that plates 80 contact every flat
side of pole 78. In another exemplary situation, additional plates
80 may be attached to accommodate a pole having more than six flat
sides 82. In yet another example, multiple narrow, planar plates 80
may be used for gripping a circular pole, such as pole 22 (FIG.
4).
[0046] FIG. 7 shows a highly simplified top view of hexagonal pole
78 showing a configuration of angled plates 90 of a pole bridle 92
in accordance with another alternative embodiment of the present
invention. Like pole bridle 76, pole bridle 92 is also adapted to
facilitate the extraction of pole 78 having flat sides 82. Although
not shown, retaining members 26 (FIG. 1) are coupled to an outer
surface 94 of angled plates 90, and chain 62 (FIG. 4) of pole
puller 70 (FIG. 4) is directed through retaining members 26.
[0047] Each of angled plates 90 includes a first leg 96 and a
second leg 98 that join at a common edge 100. First and second legs
96 and 98, respectively, are configured for abutment against
adjacent sides 82 of pole 78. As such, an angular separation 102
between first and second legs 96 and 98 corresponds with the shape
of pole 78. For example, pole 78 is illustrated as a regular
hexagon, thus each angle 104 of pole 78 is one hundred twenty
degrees. Accordingly, for a regular hexagonal pole, angular
separation 102 of angled plates 90 is approximately one hundred
twenty degrees. Similarly, for a regular octagonal pole, angular
separation 102 is approximately one hundred thirty five
degrees.
[0048] First and second legs 96 and 98, respectively, each exhibit
a planar, or flat, shape, as opposed to the convex shape of plates
24 (FIG. 1) of pole bridle 20 (FIG. 1). Accordingly, a large
surface area of an inner surface 106 of angled plates 90 contacts
adjacent flat sides 82 of pole 78 when upward force 72 (FIG. 4) is
imposed on chain 62. The location of angled plates 90 over the
corners of adjacent sides of pole 78, largely prevents chain 62
from coming into contact with and potentially damaging pole 78 as
transverse force 74 (FIG. 4) causes angled plates 90 to be drawn
snuggly against pole 78.
[0049] Referring to FIGS. 8-10, FIG. 8 shows a perspective view of
a base 108 for supporting a pole puller 110 in accordance with a
preferred embodiment of the present invention. FIG. 9 shows a
partial side view of pole puller 110, and FIG. 10 shows a partial
rear view of pole puller 110 coupled with base 108. Base 108
supports pole puller 110 to prevent pole puller 110 from kicking
into the surface, i.e., ground 60 (FIG. 4), upon which base 108
rests. It will become apparent below, that base 108 and pole puller
110 form a system that may be advantageously employed to pull
sheared and intact poles from ground 60. In addition, the system
forms a "one-unit" construction that is readily maneuvered and
efficiently utilized, thus saving the operators set-up and
tear-down time.
[0050] Base 108 includes a first bearing arm 112 and a second
bearing arm 114 in spaced-apart relation with the first bearing arm
112. First and second bearing arms 112 and 114, respectively, are
U-channels having upwardly directed legs 116. The use of U-channel
enhances the strength of first and second bearing arms 112 and 114
so that they are better able to resist bending. First bearing arm
112 is defined by a front end 118 and a rear end 120. Similarly,
second bearing arm is defined by a front end 122 and a rear end
124. Base 108 is further strengthened by a rear support 126
extending between and coupled to each of first and second bearing
arms 112 and 114 at corresponding rear ends 120 and 124.
[0051] A cross member 128 interconnects first and second bearing
arms 112 and 114, respectively, and an attachment interface 130
extends from cross member 128. Attachment interface 130 generally
includes a first support member 132, a second support member 134,
and a horizontally disposed shaft 136 coupled to and extending
between first and second support members 132 and 134,
respectively.
[0052] A housing 138 is located between first and second support
members 132 and 134, respectively. Housing 138 is attached to an
inner surface 140 of each of first and second support members 132
and 134 by, for example, welding, bolting, and so forth. Housing
138 is a generally arcuate member configured to conform to a
generally cylindrically-shaped body 142 of pole puller 110. In
addition, housing 138 includes an open region 144 through which
appendages 146 of pole puller 110 may extend.
[0053] A first strut 148 is attached to a top end 150 of housing
138. First strut 148 extends toward and couples to front end 118 of
first bearing arm 112. In particular, first bearing arm 112
includes a first brace 152 interposed between legs 116 and arranged
transverse to a longitudinal dimension 154 of first bearing arm
112. First strut 148 is attached via, for example, welding, to a
rear side 156 of first brace 152. Similarly, a second strut 158 is
attached to top end 150 of housing 138. Second strut 158 extends
toward and couples to a front end 122 of second bearing arm 114.
Second bearing arm 114 includes a second brace 160 interposed
between legs 116 and arranged transverse to a longitudinal
dimension 162 of second bearing arm 114. Second strut 158 is
attached via, for example, welding, to a rear side 164 of second
brace 160.
[0054] The arrangement of first bearing arm 112, housing 138, and
first strut 148 yields a rigid, triangular framework for providing
strength to base 108. The arrangement of second bearing arm 114,
housing 138, and second strut 158 yields a second rigid, triangular
framework for providing additional strength to base 108. First and
second struts 148 and 158 are configured in the manner described
above for optimal strength. However, other strut configurations may
be alternatively employed that also yield a rigid framework.
[0055] Ring members 166 (three of which are visible) extend from a
top surface 168 of first and second bearing arms 112 and 114,
respectively. Ring members 166 allow attachment of a hoist
mechanism, generally denoted by a single lift element 168, to base
108 to facilitate placement of base 108. Base 108 includes four
ring members 166 for four point attachment of lift elements 168. As
well known in the art, elements 168 merge at a single point from
which the hoist mechanism can apply a lifting force to manipulate
base 108 readily into and out of position.
[0056] With particular attention to FIGS. 9-10, pole puller 110
couples to attachment interface 130. To that end, pole puller 110
includes a first bracket 168 and a second bracket 170 extending
from a bottom 172 of pole puller 110. In a preferred embodiment,
pole puller 110 has a top loading ram 174 (see FIG. 11). That is,
ram 174 extends from a top 176 (FIG. 11) of body 142 of pole puller
110. As such, bottom 172 provides a solid, non-movable surface for
attachment of a base plate 178 to which first and second brackets
168 and 170, respectively, are attached.
[0057] Pole puller 110 is positioned in housing 138 and base plate
178 is seated upon shaft 136 of attachment interface 130. In this
manner, first and second brackets 168 and 170, respectively, reside
on opposing surfaces of shaft 136. A pin member 180 is directed
through a first hole 182 in first bracket 168, beneath shaft 136,
and through a second hole 184 in second bracket 170. Thus, pole
puller 110 is attached to attachment interface 130 of cross member
128. Should pole puller 110 need to be removed from base 108, pin
member 180 is simply removed, and pole puller 110 is lifted from
housing 138.
[0058] FIG. 11 shows a perspective view of base 108 and pole puller
110 being utilized with pole bridle 20 to remove a sheared pole
186. As shown, a butt 188 of sheared pole 186 is in a fixed,
embedded upright position in ground 60. In operation, base 108
supporting pole puller 110 is placed on ground 60 with sheared pole
186 between first and second bearing arms 112 and 114,
respectively. Once in position, housing 138 partially surrounds
body 142 of pole puller 110 at a pole-facing side 190 of pole
puller 110. Since pole 186 has been sheared at ground level, enough
dirt is excavated to allow pole bridle 20 to be situated about butt
188 of pole 186.
[0059] An operator encircles pole 186 with plates 24 of pole bridle
20 and with flexible member 62 in encircling-relation about pole
186, as discussed in detail above in connection with FIG. 4. Ram
174 is actuated to impose upward force 72 (FIG. 4) on flexible
member 62, which creates transverse force 74 (FIG. 4) on plates 24
of pole bridle 20 to direct plates 24 against pole 22. Transverse
force 74 largely prevents plates 24 from slipping off of butt 188
of pole 186 as upward force 72 incrementally extracts sheared pole
186 from a fixed, upright position in ground 60. In addition, as
forces are applied, pole-facing side 190 of pole puller 110 abuts
housing 138. The abutment of pole puller 110 against housing 138
prevents pole puller 110 from tipping toward pole 186. In addition,
the attachment of pole puller 110 to base 108 prevents pole puller
from kicking into the ground.
[0060] Base 108 is advantageously suited for the removal of sheared
poles because base 108 supports pole puller 110 and prevents pole
puller 110 from kicking into ground 60. As such, pole puller 110
need not abut the pole. However, base 108 additionally facilitates
the removal of poles, such as pole 22 (FIG. 4), that are not
sheared. In addition, pole bridle 20 need not be utilized when the
pole to be removed is a wood pole. Rather, a chain, may be wrapped
directly around the pole. As upward force 72 is applied, the links
of the chain will bite into the wood to largely prevent the chain
from rolling or slipping.
[0061] In summary, the present invention teaches of a base for
supporting a pole puller. In addition, the present invention
teaches of a pole bridle that is operable with the base and the
pole puller for manipulating a pole. The base provides support for
the pole puller so that the pole puller cannot kick into the
ground. Moreover, the housing of the base partially surrounding the
pole puller provides support for the pole puller so that the puller
need not abut the pole to be pulled. Accordingly, the base with
attached pole puller facilitate the extraction of a sheared pole.
The base is sturdily built, includes rings to which hoist lines may
be connected for ready placement and removal, and the one-piece
configuration of the base and pole puller makes the pole puller
system easy to use. Thus, significant savings is achieved in time,
equipment, and labor costs associated with other pole pulling
techniques, while increasing worker safety.
[0062] Although the preferred embodiments of the invention have
been illustrated and described in detail, it will be readily
apparent to those skilled in the art that various modifications may
be made therein without departing from the spirit of the invention
or from the scope of the appended claims. For example, the use of
the pole pulling system is described in connection with the
extraction of poles from fixed, embedded upright positions.
However, the present invention may also be used to manipulate poles
when setting the poles.
* * * * *