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Патент USA US3028034

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April 3, 1962
R. R. McCAMlSH
3,028,022
METHOD AND APPARATUS FOR HOISTING POLES
Filed April 25, 1957
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Aprll 3, 1962
R. R. MCCAMISH
3,028,022
METHOD AND APPARATUS FOR HOISTING POLES
Filed April 23, 1957
2 Sheets-Sheet 2
26
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776.5.
[.IME
ROBERT R. MC CAM/SH
INVENTQ‘?
HUEB/VER, BEEHLER 8 WORREL
A TTORNEKS"
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WWW
3,ll28,®22
Sttes
Patented Apr. 3, 1982
2
1
FIG. 5 is a somewhat enlarged fragmentary longitudi
nal section of a portion of the pike particularly showing
3,028,022
IVEETHOD AND APPARATUS FOR
a check valve passage in an hydraulic system forming
HOISTING POLES
Robert R. McQarnish, 4546 E. Nevada, Fresno, Calif.
Filed Apr. 23, 1957, Ser. No. 654,595
10 Claims. (Cl. 214-3)
part of the implement.
FIG. 6 is a somewhat enlarged longitudinal section of
the lower end of the hoisting implement showing other
passageways in the hydraulic system.
Referring more particularly to the accompanying draw
The present invention relates to a method and appara
ing, a mechanically powered pike is generally indicated
tus for hoisting or raising poles and more particularly
to a powered hoisting implement, or pike, especially 10 by the numeral 10 in FIG. 1. The pike provides a lower
body 11 having an upwardly disposed internally threaded
adapted to erect and set poles in precisely vertical, or
other generally upright, positions.
socket 12.
An hydraulic ram 16 includes an elongated ram cylinder
17 having a lower externally threaded end 18 screw
cording to conventional practices. The poles are usually 15 threaded into the socket 12 and an upper externally
threaded end 19. A nut 20 is screw-threaded over the
inserted in holes dug for the purpose with the aid of a
upper end of the ram cylinder and provides a central
,-cable connected to a truck hoist. While the cable is
bore axially aligned with the ram cylinder. An elongated
still connected to a pole, the workmen shove elongated,
cylindrical tube 21 is extended between the nut and the
rigid hoisting implements having sharpened points into
Crews of seven or eight workmen are usually assigned
to erect power poles for electrical transmission lines ac
the pole from all sides in order to steady, guide and posi
tion the pole. These implements are known in the art as
pikes and are hereinafter so designated. Obviously con
20
body in circumscribing, peripherally spaced, concentric
relation to the ram cylinder. The tube is in ?uid-tight
engagement with the nut and the body and together with
the ram cylinder de?nes a ?uid reservoir 22.
siderable teamwork is required between the workmen
An elongated piston rod 26 is mountedfor slidable
for satisfactory results. Conventional pikes are frequent
ly about eighteen feet long and of metal or wood. With 25 movement in the ram cylinder 17 and has a lower end
27 terminating in external threads. A cup piston 30 is
the pikes impaling the pole, the workmen increase or
relieve pressure on various sides of the pole and thus
?tted over the lower end of the rod and a nut 32 is screw
threaded on said lower end to retain the piston on the
attempt to hoist the pole into precise position. After
rod. The piston rod has an upper end slidably extended
the position has been obtained, dirt is ?lled in the hole
around the pole and tamped down.
30 ‘through the bore of the nut 29. The invention is not
to be limited to the use of an hydraulic ram but other
This is a tedious, time consuming, and somewhat haz~
telescopic extension devices, such as a mechanical jack,
ardous task. When the pikes are made of wood, work
may be employed. However, the described hydraulic
men frequently get splinters in their hands. It has been
ram has marked advantages for the purpose.
known for heavy pikes to fall onto workmen imposing
An elongated, cylindrical outer sleeve 36 is concentric~
serious injury. Further, sprained backs and other undue 35
ally slidably ?tted over the tube 21 for longitudinal slid
muscular strains result from suddenly having to bear
able movement on the tube. The sleeve has an open
part of the weight of a pole while attempting to bring
lower end terminating adjacent to the lower end of the
it into vertical position.
tube when the piston 30 is fully retracted and an upper
Accordingly, it is an object of the present invention
to provide an improved method and apparatus for erect 40 end secured, as by welding, to- a head 38 on the upper
end of the piston rod 26.
ing poles and the like.
The body 11 provides a substantially cylindrical bore
‘Another object is to provide a powered extensible and
49, constituting a pump cylinder, positioned with its longi
retractable pike.
tudinal axes extended upwardly in acute angular relation
Another object is to minimize or prevent muscular and
bodily injury and/ or fatigue in erecting poles.
45 to the axis of the socket 12 and opening exteriorly of the
body. A packing nut 41 having a central bore is screw
Another object is to enable the hoisting of poles by
threaded into the pump cylinder 49, and an elongated
mechanical rather than manual means.
pump piston rod 42 is longitudinally slidably ?tted in
Another object is to reduce the time and labor incident
the pump cylinder and the bore of the packing nut. The
to the hoisting of poles and the expenses incident thereto.
Another object, in a power operated pike adapted to 50 pump piston rod has a lower end 43 over which is ?tted
a backing washer 44, and a cup piston 45. A piston re
penetrate a pole, is to prevent undue impalement of the
tainer 46 is secured to the pump piston rod endwardly
pole with the pike and to facilitate subsequent removal
of the piston.
thereof.
Other objects are to provide a hoisting implement of
Brackets 50 are upwardly extended from the body 11
on opposite sides of the pump cylinder 40 and mount a
the character described which is simple in construction
horizontal pivot pin 51 therein. A handle socket 52 is
and operation, dependable in action, and durable in
journaled on the pivot pin, and a further pin '53 connects
form.
These and other objects will become more fully ap
I the handle socket to the pump piston rod 42. A pump
parent upon reference to the following description.
handle 54 is provided for releasable insertion into the
In the drawings:
60 handle socket for moving the pump piston rod longi
tudinally inwardly and outwardly of the pump cylinder ‘40.
FIG. 1 is a perspective view of two of the pikes of the
present invention shown as used in raising a power pole
into vertical position.
,
The body 11 has a check valve passage 60, best seen
in FIG. 5, including an inner cylindrical section 61, an
intermediate cylindrical section 62, and an outer cylin
FIG. 2 is a somewhat enlarged elevation, with por
‘ tions in longitudinal section and other portions broken 65 drical section 63 opening externally of the body, each
away, of one of the pikes of FIG. 1 with the cap removed.
of successively greater diameter. A valve plug 64 is
FIG. 3 is a fragmentary side elevation of the upper
screw-threaded into the open end of the valve passage,
end of the pike of FIG. 2 showing the cap ?tted on said
and a valve seal 65 positioned against the plug. A suc
upper end.
tion ball 67 is yieldably urged against the mouth of the
FIG. 4 is a fragmentary front elevation, partially in 70
inner section by means of a suction spring 68, and a
section, of the lower end of the pike and showing in par
, ticular a supporting base therefor.
‘pressure ball 69 is yieldably urged against the mouth of
3,028,022
3
4
the intermediate section by means of a pressure spring 70.
hole 135 is dug in the ground 136 so as to provide a
bottom wall 137 and an upstanding circumscribing side
The latter spring also bears against the valve seal.
An extension passage 75 interconnects the inner section
61 of the check valve passage 60 with the reservoir 22.
wall 138 terminating in an upper edge 139.
It is as
sumed for illustrative convenience that a concrete pave
ment ‘14% is located near the hole.
A ram passage 76 interconnects the outer section 63 with
the ram cylinder 17 at the lower end thereof beneath the
The lower end 131 of the pole 130 is inserted into the
piston 30. The ram passage has an inner end portion,
hole 135 with the aid of a cable and truck hoist, neither
and an outer end extension 78 in which is screw-threaded
of which are shown, but which are conventionally used
in such an operation. The lower end of the pole rests
a packing nut 77. A release valve 79 is screw-threaded
into a bore in the packing nut having an inner end adapt 10 on the bottom wall 1'37 of the hole and the pole leans
ed to seat in the inner end portion of the ram passage.
against the upper edge 139 toward the pavement. With
The body also has a retraction reservoir passage 80‘ inter
the cable, not shown, still connected to the pole, the hole
connecting the outer end portion 78 of the ram passage
is partially ?lled, preferably about one-half, with dirt 145
and the reservoir. When the release valve is backed off,
so that the lower end of the pole is surrounded with dirt.
?uid communication is established between the reservoir 15 This dirt is then tamped in around the pole with the pole
still in slightly inclined position.
and the ram passage. When the release valve is tightened
inwardly, however, this communication is blocked. Still
Next, two pikes 10 are placed on the side of the pole 130
further, the body has a pump cylinder passage 81 inter
toward which the pole leans. The auxiliary base 112 of
connecting the intermediate section of passage 6% and the
each pike is positioned with the plate 113 ?ush against
lower end of the pump cylinder 40.
the pavement 1'40 and with the shaft 115 substantially,’
An elongated rigid shank 85 has a lower end ‘86 se
tangential to a circle concentric to the hole 135 and in
cured, as by welding, to the upper end of the outer sleeve
spaced relation thereto. The chain 120 is connected to
36. The shank is axially extended from the sleeve, and
the eyelet 124 and the hook 126 is engaged over the
thus the ram piston rod 26, and has an upper end 87 of
upper edge 139 of the hole, or the edge of the pavement
reduced diameter. The upper end has a slightly curved, 25 between the hole and the auxiliary base, as indicated in
tapered tip 88 which is preferably somewhat ?attened
dashed lines in FIG. 1; the chain is looped around the
though terminating in a sharpened knife edge. A stop
pole and connected to a link of the chain, as shown in
collar 89 is secured to the upper end of the shank at an
full lines in FIG. 1; or the chain is otherwise anchored
angle of substantially 45° with the shank and immediate
in the ground so that movement of the base away from the
30
ly below the tip.
pole is resisted. With the ram 16 retracted, the bearing
An eyelet 95 is secured to the shank 85 adjacent to the
‘108 is ?tted over the shaft 115 and the pike leaned against
upper end 87, and a coiled tension spring $6 has an end
the pole with the tip 88 in engagement therewith. The
connected to the eyelet. A substantially cylindrical elon
cap 97 is, of course, ?rst removed. The length of the
gated hollow cap 97 provides a closed upper end 98 and 35 chain, that is, the distance of the base 112 from the hole
an open lower end 99 circumscribed by a beveled edge at
an angle of approximately 45° with the longitudinal axis
of the cap. The spring provides an extended end which
is connected to the cap adjacent to its upper end by an
other eyelet 100. The spring is of such length as to
permit placement of the cap over the tip 88 of the shank
with the lower beveled edge of the cap engaging the upper
surface of the collar 89. ‘In this position the spring ex
erts slight pressure on the cap longitudinally of the shank
for dependably holding it in position. The cap, of course,
is conveniently removed by sliding it upwardly off from
the tip and allowing it to hang freely from the shank.
The body 11 of the pike 10 is secured, as by welding,
is such that the angle of the pike with the ground is
approximately 45°. The bearing, in rotating on the shaft,
enables positioning the pike at 45°, or other desired angle.
The pump handle 54 is inserted into the socket 52
and the pump piston rod 42 reciprocated in the pump cyl
inder 40. On the tip-stroke, ?uid is drawn through the
reservoir passage 75 into the intermediate section 62 of
the check valve passage 60, and on the down-stroke, said
?uid in the intermediate section is forced into the outer
section and through the ram passage 76 into the cylinder
17 to extend the piston rod 26 and thus the shank 85.
Continued pumping of the handle 54 causes the tip 88
to penetrate the pole. The stop collar 89 limits this pene
to a channel-shaped main base 105 including a central
tration. Because of the angle of the pike and the angle
panel 106, and a pair of downwardly extended side panels 50 of the collar, the latter is in substantially ?at engagement
107. A downwardly concave, fracto-cylindrical bearing
with the pole. The rotatably engaged bearing 108 and
108 is secured to the underside of the central panel be
shaft 115 preclude imposition of bending forces on the
tween the side panels and substantially parallel to the
pike by allowing the pike to pivot around shaft ‘115 as a
latter.
horizontal axis.
An auxiliary base 112 is provided including a substan~ 55
As the pikes 10 are extended, the pole 130 is shoved
tially rectangular plate 113, spaced substantially parallel
away from them toward a vertical position. Upon reach
side ?anges 114 rigidly upwardly extended from the plate,
ing a vertical, extension of the pikes is stopped, and the
and a rigid shaft 115 interconnecting the side ?anges in
hole is completely ?lled with dirt 145.
spaced relation to the plate.
However, partial ?lling of the hole 135 with dirt 145
An elongated preferably adjusted ?exible tie member 60 enables movement of the pole 130 into vertical position
120, such as a chain provides an end 121 adapted for con
by a preferred procedure. The pikes are extended to
nection to either the main base 105 or to the auxiliary
base 112 by means of eyelets 123 and 124 respectively
move the pole slightly beyond a vertical to place the dirt
146 between the pole on the side of the pole opposite to
the pikes and the side wall 135 of the hole under com
secured to said bases, and an opposite end 125 to which
is connected a hook 126.
65 pression. Although this is preferably purposely done, it
even may occur unintentionally. In any event the dirt
Operation
in the hole provides a resilient cushion inasmuch as it is
somewhat resiliently compressible and forces the pole
The operation of the described embodiment of the sub
back toward a vertical position upon slightly contracting
ject invention is believed to be readily apparent and is
brie?y described at this point. The operation is best un 70 the ram 16. It will be evident that the dirt acts as an
automatic and controllable force on the opposite side of
derstood in connection with the erection of a power pole,
the pole from the pikes so that a latitude of adjustment
indicated at 130, having a lower end 131 and an upward-i
is afforded for bringing the pole in-to precise position.
ly extended end 132.
While describing the operation of the pike 10‘, a novel
Thus with the rams both slightly over extended, great
method of erecting a pole is also described. Initially, a 75 ?nesse can be achieved in precise positioning by placing
3,028,022
5
6
a level or other position checking means against the pole
is adapted for ?ush engagement with a pole to enable
and gradually releasing hydraulic ?uid from either or
maximum application of pressure to the pole.
3. The pike of claim 1 wherein the mounting means in
both rams by means of the valves 79 so that the resiliently
cludes a body having a socket into which the ram cylinder
is ?tted, an annular nut connected to the cylinder in
compacted soil urges the pole into position.
After the pole 130 is positioned and with the pikes 10'
still in position, the hole is completely ?lled with dirt
145 and tamped down. The pikes are then contracted
and removed from the pole by backing off the release
spaced relation to the body and slidably receiving the
piston rod, an elongated tube in circumscribing circum
ferentially spaced relation to the ram cylinder having
opposite ends in ?uid-tight engagement with the nut and
valve 79 to allow ?uid to escape from the ram cylinder
17 into the reservoir 22. As above stated, the collars 89, 10 with the body and de?ning a resorvoir with the ram
cylinder, the sleeve being in slidable ?tted engagement
over the tube, the body including a pump cylinder and
?uid passageways interconnecting the pump cylinder, the
ram cylinder, and the ?uid reservoir, a pump piston rod
is usually not employed. The main base M5 is then used
since the side panels 109 frictionally engage or slightly 15 longitudinally reciprocally mounted in the pump cylinder
for pumping ?uid from the reservoir into the ram cylinder
penetrate the earth to hold the base in position. In this
in preventing undue penetration, facilitate disengagement
from the poles.
In working on ordinary ground, the auxiliary base 112
case, the chain 120 can also be employed, as before.
for extending the shank, a handle connected to the pump
It will be evident from the foregoing that the powered
pike 10 offers a decided improvement over the pikes of
piston rod for enabling reciprocation thereof and ex
tended outwardly from the sleeve adjacent to the base,
and means mounted in the body releasably extended into
the prior art. The device reduces the time and labor re—
quired in erecting poles and avoids the hazards ‘and strain
previously encountered. In practice, a line of power
poles extending over many miles of mountainous terrain
has been erected by only three men using pikes of the
the passageways for releasing ?uid from the ram cylinder
for return to the reservoir to enable retraction of the
shank.
4. An hydraulic pike for hoisting an elongated pole
present invention as compared with the usually required 25 into substantially vertical position, which pole has a lower
end inserted into a hole in the ground and prior to being
crew of seven or eight needed for even level ground
hoisted by said pike is in angular relation to the ground,
operation.
comprising an hydraulic ram including a cylinder and a
Although the invention has been herein shown and de
piston rod longitudinally reciprocally mounted in the
scribed in what is conceived to be the most practical and
preferred method and embodiment, it is recognized that 30 cylinder for extension and retraction relative to the
cylinder, an elongated rigid shank connected to the piston
departures may be made therefrom within the scope of
rod and axially extended therefrom having an upper
the invention, which is not to be limited to the details
sharpened pole penetrating end adapted to engage the
disclosed herein but is to be accorded the full scope of
pole in upwardly spaced relation from the‘ ground, an
the claims so as to embrace any and all equivalent
methods, devices, and apparatus.
35
elongated outer guide sleeve longtudinally slidably ?tted
Having described my invention, what I claim as new
and desire to secure by Letters Patent is:
in circumscribing relation to the ram and having an upper
end rigidly connected to the shank for longitudinal move
1. An hydraulic pike for hoisting an elongated pole
ment therewith relative to the ram, means connected to
the ram for extending the piston rod to drive the pene
being hoisted by said pike is in angular relation to the 40 trating end into the pole and to raise the pole and for
retracting the rod to remove said end from the pole, the
ground comprising a base member adapted to rest on the
sleeve serving to impart strength to the connection be
ground in spaced relation to the hole, an hydraulic ram
tween the shank and the ram and particularly when the
including a cylinder and a piston rod longitudinally re
piston rod is extended and Weight of a pole is borne by
ciprocally mounted in the cylinder for extension and re
traction relative to the cylinder, means mounting the 45 the pike thereby resisting bending forces and facilitating
free slidable movement of the piston rod in the cylinder,
cylinder on the back, an elongated rigid shank connected
a stop collar connected to the shank adjacent to said
to the piston rod and axially extended therefrom having
penetrating end transversely of the shank and engageable
a single upper sharpened pole penetrating end adapted
with the pole upon extension of the ram for limiting
to engage the pole in upwardly spaced relation from the
penetration of said end into the pole whereby extension
ground, an elongated outer guide sleeve longitudinally
of the ram urges the pole into substantially vertical posi
slidably ?tted in circumscribing relation to the ram and
tion, a substantially rectangular plate adapted to be sup
having an upper end rigidly connected to the shank for
ported on the ground in ‘spaced relation to the hole,
longitudinal movement therewith relative to the ram,
spaced ?anges upstanding from the plate, a shaft rigidly
means connected to the ram for extending the piston rod
to drive the penetrating end into the pole and for retract 55 interconnecting the ?anges adapted to be positioned sub
.stantially tangential to a circle concentric to the hole, a
ing the rod to remove said end from the pole, the sleeve
concave bearing rotatably ?tted on the shaft, and means
serving to impart strength to the connection between the
mounting the bearing on the cylinder of the ram in sub
shank and the ram and particularly when the piston rod
stantially perpendicular relation thereto for enabling
is extended and weight of a pole is borne by the pike
thereby resisting bending forces and facilitating free slid 60 pivotal movement of the ram and the shank around said
shaft as an axis toward and away from the pole during
able movement of the piston rod in the cylinder and a
extension and retraction of the ram whereby bending
stop collar connected to the shank adjacent to said pene—
forces are not imposed on the ram and the shaft.
trating end transversely of the shank and engageable with
5. A method for erecting an elongated power pole hav
the pole upon extension of the ram for limiting penetra
tion of said end into the pole whereby extension of the 65 ing a lower end comprising digging a hole in the ground
having a substantially horizontal bottom and a substan
ram urges the pole into substantially vertical position.
tially vertical circumscribing side wall terminating in an
2. The pike of claim 1 wherein the tip is slightly
upper edge, inserting the lower end of the pole in the hole
curved, is tapered to a point, and is somewhat ?attened
and resting said lower end on said bottom with the pole
transversely thereof; wherein the shank has a longitudinal
concentric axis; and wherein the collar is annular, pro 70 leaning against the upper edge of the hole in angular
relation to the surface of the ground, ?lling substantially
vides a plane upper surface and is in oblique angular
half of the hole around the pole with dirt having resilient
relation to the axis of the shank and in substantially the
compressibility so that the lower end of the pole in the
same angular relation thereto as the angular relation be
hole is surrounded by dirt, tamping said dirt in the hole
tween the shank and the ground when the pike is in posi
tion against a pole so that the upper surface of the collar 75 until it is packed around the lower end of the pole, ap
lower end inserted into a hole in the ground and prior to
‘3,028,022
a
viding a substantially cylindrical peripheral portion and
plying pressure to the pole in Vertically spaced ‘relation
a piston mounted for reciprocal movement in the cylinder
and having a piston rod ‘extended from the cylinder, con
trolled hydraulic means‘ connected to the ‘cylinder of the
to the ground to move the pole from said angular p‘osia
tion to slightly beyond a vertical position so as to place
the dirt under compression between the pole and the side
wall on the opposite side of the pole from the side on
ram for longitudinally extending and contracting the
which pressure is applied, gradually relieveing the pres
sure on the pole until the resilience of said compressed
dirt returns the pole to substantially vertical position,
completely ?lling the hole with dirt around the pole,
tamping said dirt to pack it tightly around the pole, and
removing said pressure.
6. An apparatus for hoisting an elongated pole, such
piston rod from the cylinder, ‘means mounting the cylinder
angular relationship with the hole, hydraulic rams‘in
pressibility in the hole about the pole, applying independ
on the base member, an elongated shank rigidly con
nected to the piston rod in longitudinal alignment there
with, the shank having an extended end providing a
sharpened tip for pole engagement, a stop collar mounted
on the shank adjacent to the tip having a pole engaging
surface obliquely related to the shank, and a sleeve rigidly
connected to the shank and slidably received on the pe
as those employed in connection with electrical power
ripheral portion of the cylinder of the ram to resist mis
lines, into substantially vertical position, the pole having
a lower end inserted into a hole in the ground and, prior 15 alignment of the shank with the piston rod ‘during con
traction and extension movement thereof.
to such hoisting, being in angular relation to the ground,
9. A method for setting an elongated pole having a
comprising a pair of elongated, individually longitudi
lower end, in a hole previously provided in the ground
nally continuously adjustable hydraulic pikes individually
comprising placing the lower end of the pole in the hole
including base members ‘adapted to rest on the ground in
with the pole upwardly inclined therefrom whereby the
spaced relation to each other and to the hole on the side
pole has an underside, placing dirt having resilient com
of the hole toward which the pole is leaning and in tri
eutly contrclled lifting pressures to the underside of the
eluding cylinders individually secured to their respective
bases and piston rods longitudinally reciprocally mounted
in their respective cylinders for extension and retraction
relative to the cylinders, elongated rigid shanks connected
to the piston rods and axially extended therefrom having
upper sharpened pole penetrating ends adapted to engage
the pole in upwardly spaced relation from the ground and
in closely adjacent ‘peripherally spaced relation on the
side of the pole toward which the pole is leaning, means
pole along two angularly related lines of force spaced
transversely of the pole to lift the pole to approximately
a desired ultimate substantially upright position ‘whereby
dirt is resiliently compressed in the hole on the side of
the pole opposite to said lines of force, and independently
regulating said pressures in relation to the resilient com
pression of the dirt to achieve movement of the pole to
said ultimate position in selected universal direction.
connected to the rams for extending the piston rods to
10. A method for setting an elongated pole having a
drive the penetrating ends into the pole and for retracting
lower end, in a hole previously provided in the ground
comprising placing the lower end of the pole in the hole
with the pole upwardly inclined therefrom whereby the
pole has an underside, ?lling substantially the lower half
the rods to remove said ends from the pole, stop collars
individually connected to the shank adjacent to their re
spective penetrating ends, transversely of the shanks, and
of the hole about the pole with dirt having resilient com
engageable with the pole upon extension of their respec
tive rams for limiting penetration of said ends into the
pole whereby extension of the rams urges the pole into
pressibility, applying independently controlled lifting
erect positions comprising a base member adapted to rest
on the ground, an elongated hydraulic ram having oppo
said pressures in relation to resilient compression of the
dirt whereby when either pressure is substantially greater
than the resilient compression of the dirt the pole moves
pressures having horizontal components of force to the
substantially vertical position, ‘and tension members in 40 underside of the pole along two angularly related lines of
force spaced peripherally of the pole to lift the pole to
dividually interconnecting the base members and the pole
approximately a desired ultimate substantially upright po
adjacent to the ground anchoring the base members in
sition whereby dirt is resiliently compressed in the hole on
predetermined substantially ?xed spaced relation to the
the side of the pole opposite to said lines of force, and
hole.
independently and selectively increasing and decreasing
7. An hydraulic pike for hoisting elongated poles into
site ends and a substantially smooth cylindrical periphery,
in the direction of said pressure and when either pressure
controlled hydraulic means connected to the ram for
longitudinally extending and contracting the ram, an 50 is substantially less than the resilient compression of the
dirt the pole moves in opposition to said pressure until the
elongated rigid shank connected to the end of the ram
pole reaches said ultimate position, and ?lling the re
mainder of the hole to hold the pole in said position while
the pole is still subject to said pressures.
opposite from the base ‘and extended longitudinally from
the ram in substantial alignment with contraction and
extension movement thereof, a shank having an extended
end providing a sharpened tip endwardly extended there
from, a stop collar mounted on the shank in spaced adja
cent relation to the tip having a pole engaging surface
obliquely related to the shank, and a sleeve rigidly con
nected to the shank and slidably ?tted to the cylindrical
periphery of the ram to resist misalignment of the shank
with said contraction and extension movement of the ram.
55
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,174,950
Sedgwick _____________ __ Mar. 7, 1916
1,482,846
2,604,640
Harrah _______________ __ Feb. 5, 1924
Junkin ______________ __ July 29, 1952
8. An hydraulic pike for hoisting elongated poles into
2,757,903
Bill __________ .__> ______ __ Aug. 7, 1956'
erect position comprising a base member adapted to rest
on the ground, an hydraulic ram having a cylinder pro
2,814,396
2,915,210
Neale _______________ __ Nov. 26, 1957
Ehmann ______________ __ Dec. 1, 1959
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