U.S. patent number 3,752,242 [Application Number 05/199,121] was granted by the patent office on 1973-08-14 for hydraulically actuated cavity forming device.
Invention is credited to Ernest J. Gremillion.
United States Patent |
3,752,242 |
Gremillion |
August 14, 1973 |
HYDRAULICALLY ACTUATED CAVITY FORMING DEVICE
Abstract
A pair of longitudinally movable stems supported for generally
vertical movement by a supporting and guiding structure on a mobile
vehicle with the stems being extended and retracted by a unique
actuating mechanism in the form of a hydraulically powered piston
and cylinder assembly and an overdrive driving connecting with the
stems for moving the stems a longitudinal distance twice the
longitudinal extension and retraction of the piston and cylinder
assembly. A hydraulic motor is provided for rotating the stems
which are hollow and provided with an auger flight on the lower end
thereof to facilitate insertion into the ground surface after which
the stems may be slightly elevated to form an underground cavity
into which an explosive charge may be introduced through the hollow
stems for detonation, such as is employed in determining
underground formations in underground surveys.
Inventors: |
Gremillion; Ernest J. (Cut Off,
LA) |
Family
ID: |
22736315 |
Appl.
No.: |
05/199,121 |
Filed: |
November 16, 1971 |
Current U.S.
Class: |
175/108; 173/50;
181/116; 173/147 |
Current CPC
Class: |
E21B
7/026 (20130101); E21B 19/084 (20130101) |
Current International
Class: |
E21B
19/084 (20060101); E21B 19/00 (20060101); E21B
7/02 (20060101); E21c 005/06 (); E21c 005/11 () |
Field of
Search: |
;175/108,122,203
;173/147.50,52 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Brown; David H.
Claims
What is claimed as new is as follows:
1. A device for forming an underground cavity comprising a
supporting frame adapted to be carried by a mobile vehicular
structure, at least one stem extending generally vertically for
longitudinal insertion into the soil, means guidingly supporting
said stem from said frame to guide and support the stem during its
longitudinal movement, and means interconnecting the frame and stem
for extending and retracting the stem longitudinally, said means
including a fluid pressure operated piston and cylinder assembly
having a reciprocally movable power output rod, and overdrive means
interconnecting the power output rod and the stem for moving the
stem a longitudinal distance a multiple of the longitudinal
distance of movement of the power output rod of the piston and
cylinder assembly thereby enabling the stem to be forced downwardly
into the ground a distance substantially greater than the over-all
length of the piston and cylinder assembly, said means guiding and
supporting the stem from the frame including a tubular sleeve rigid
with the frame, a tubular member slidable longitudinally in the
tubular sleeve, and said stem being longitudinally slidably movable
in the tubular member, said tubular member being connected with
power output rod for direct longitudinal reciprocation therewith
whereby the guiding relationship of the stem within the tubular
member is longitudinally reciprocated as the stem is longitudinally
extended and retracted by operation of the piston and cylinder
assembly, said overdrive means including a flexible chain member
having one terminal end anchored with respect to the power output
rod for movement therewith, an upwardly extending portion entrained
over rotatable means journaled stationarily with respect to the
frame, a downwardly extending portion entrained under journal means
movable with the power output rod, an upwardly extending portion
connected with the upper end of the stem and entrained over journal
means movably supported with respect to the supporting frame, a
downwardly extending portion entrained under journal means rigid
with respect to the frame and an upwardly extending portion
anchored movably with respect to the supporting frame to provide a
positive longitudinal reciprocation of the stem a distance
substantially twice the movement of the power output rod.
2. The structure as defined in claim 1 wherein said piston and
cylinder assembly is mounted substantially parallel to the path of
reciprocation of the stem and tubular member, the lower end of said
cylinder being rigidly supported from said frame, a guide member
movably supported from the upper end of the cylinder and forming a
support for the journal means supported movably in relation to the
frame and a terminal anchor point for the terminal end of a chain
movable with respect to the frame.
3. The structure as defined in claim 2 wherein the lower end of the
power output rod is connected to a crosshead having the lower end
of the tubular member anchored thereto, said crosshead including
power means drivingly connected with the stem for rotating the
portion of the stem inserted in the ground, said stem including an
auger flight on the lower end portion thereof to facilitate
insertion of the stem into the ground without removing a column of
dirt therefrom.
4. The structure as defined in claim 3 wherein said supporting
frame includes a downwardly opening hollow cavity receiving the
crosshead and power means for the stem when in retracted position
to enable the lower end of the stem to be elevated to a position
for movement over substantially any terrain.
5. The structure as defined in claim 4 wherein said stem is
provided with a longitudinal bore therethrough for communication
with the lower end of the stem and adapted to be communicated with
a pressurized source of explosive mixture for introducing an
explosive charge into a cavity formed underground when the stem has
been inserted completely into the ground surface and then elevated
a short distance whereby the flight on the lower end of the stem
will form a relatively short cavity for receiving an explosive
charge to be detonated during underground survey.
6. The structure as defined in claim 5 together with means mounting
the frame from a vehicle for pivotal movement about a transverse
axis to enable the piston and cylinder assembly, tubular member,
sleeve and stem to be pivoted to an inoperative position in a
horizontally inclined position to facilitate movement from one
location to another.
7. The structure as defined in claim 6 wherein said piston and
cylinder assembly and power means for the stem are hydraulically
actuated.
8. A device for simultaneously forming a pair of underground
cavities comprising a supporting frame adapted to be carried by a
mobile vehicular structure, a pair of parallel stems extending
generally vertically for longitudinal insertion into the soil,
means guidingly supporting said stems from said frame to guide and
support the stems during their longitudinal movement, and means
interconnecting the frame and stems for extending and retracting
the stems longitudinally, said means including a fluid pressure
operated piston and cylinder assembly having a reciprocally movable
power output rod, and overdrive means interconnecting the power
output rod and the stems for moving the stems a longitudinal
distance a multiple of the longitudinal distance of movement of the
power output rod of the piston and cylinder assembly thereby
enabling the stems to be forced downwardly into the ground a
distance substantially greater than the over-all length of the
piston and cylinder assembly.
9. The structure as defined in claim 8 wherein said overdrive means
includes a pair of flexible members each having one terminal end
anchored for movement with the power output rod, an upwardly
extending portion entrained over means mounted stationarily with
respect to the frame, a downwardly extending portion entrained
under means movable with the power output rod, an upwardly
extending portion connected with the upper end of the respective
stem and entrained over means movably supported with respect to the
frame, a downwardly extending portion entrained under means
stationary with respect to the frame and an upwardly extending
portion anchored for movement with the power output rod to move the
stem a longitudinal distance substantially twice the distance of
movement of the power output rod.
10. The structure as defined in claim 9 wherein the lower anchored
terminal ends of the flexible members are anchored to a crosshead
attached to the lower end of the power output rod, said crosshead
being lowerable along with the terminal ends of the flexible
members.
11. A device for forming an underground cavity comprising a
supporting frame adapted to be carried by a mobile vehicular
structure, at least one stem extending generally vertically for
longitudinal insertion into the ground, means guidingly supporting
said stem from said frame to guide and support the stem during its
longitudinal movement, and means interconnecting the frame and stem
for longitudinally extending and retracting the stem, said means
including a power drive having a power output member, and overdrive
means interconnecting the power output member and the stem for
moving the stem a longitudinal distance a multiple of the distance
of movement of the power output member of the power device, said
overdrive means including a flexible member having one terminal end
anchored with respect to the power output member for movement
therewith, an upwardly extending portion entrained over means
mounted stationarily with respect to the frame, a downwardly
extending portion entrained under means movable with the power
output member, an upwardly extending portion connected with the
upper end of the stem and entrained over means movably supported
with respect to the supporting frame, a downwardly extending
portion entrained under means stationary with respect to the frame
and an upwardly extending portion anchored for movement with the
power output member to move the stem a longitudinal distance
substantially twice the distance of movement of the terminal ends
of the flexible member.
12. The structure as defined in claim 11 wherein said power output
member is connected to a vertically reciprocal crosshead having the
lower terminal end of the flexible member anchored thereto, said
means guidingly supporting said stem including a vertically
extending tubular member reciprocally guided in the frame and
having the crosshead rigid with the lower end thereof, said stem
being reciprocally mounted in the tubular member for extension and
retraction and means on the upper end of the tubular member to
which the upper terminal end of the flexible member is anchored.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a device for forming
below ground cavities for introduction of an explosive charge and
which includes a pair of rotatably driven stems that are forced
downwardly into the ground surface by a hydraulic mechanism which
includes a piston and cylinder assembly which is longitudinally
extensible and retractable and which is connected with the stems in
such a manner to extend and retract the stems a longitudinal
distance twice the longitudinal extension and retraction of the
piston and cylinder assembly.
2. Description of the Prior Art
In underground exploration and survey work, the characteristics of
the underground formations are determined by detonation of
explosive charges in predetermined patterns and recording the
characteristics of the shock waves emanating from such explosions.
Those skilled in the art are then able to interpret such
information to determine the characteristics of the underground
formations involved. In carrying out such surveys, it is necessary
to form an underground cavity into which the explosive charges are
placed for detonation. Various techniques have been employed for
forming such cavities and while the performance thereof is adequate
to a certain degree, such previously known devices generally
require excessively large equipment which is extremely difficult to
maneuver into position and also does not form the cavity in a quick
and efficient manner which is necessary to economically conduct an
underground survey.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a cavity forming
device mounted on a vehicle capable of traversing any terrain
encountered and constructed for high maneuverability with the
cavity forming device including a pair of stems which are
longitudinally guided in a generally vertical direction by a
suitable supporting and guiding framework and which are extended
and retracted by a hydraulically operated piston and cylinder
assembly connected to the respective stems by a unique mechanism
which extends and retracts the stems a longitudinal distance twice
that of the longitudinal extension or retraction of the piston and
cylinder assembly, thereby enabling a rapid insertion and
retraction of the stems for reducing the time necessary to form the
cavities and also enabling an overall reduction in the dimensions
of the piston and cylinder assembly and the related structure.
Another object of the invention is to provide a cavity forming
device in which the stems are hydraulically rotated and provided
with an auger flight at the bottom thereof which is substantially
greater in diameter than the external dimensions of the stems to
facilitate insertion of the stems into the ground and enabling a
cavity to be formed after the stems have been inserted by elevating
the stems a relatively short distance, thus lifting the column of
soil above the flight a short distance to provide a cavity with
which the bottom end of the stems communicate.
A further object of the invention is to provide a cavity forming
device in accordance with the preceding object in which the stems
are hollow and adapted to be communicated with an explosive charge
forming material for introduction of an explosive charge into the
cavity formed below the auger flight through a check valve assembly
in the lower end of each stem to provide for detonation of the
explosive charge in the cavity after which the rotational direction
of the stems may be reversed and the stems rapidly retracted from
the ground surface without leaving a vertically elongated bore in
the ground surface.
Yet another object of the invention is to provide a cavity forming
device in accordance with the preceding objects in which the
extending and retracting mechanism for the stems as well as the
supporting and guiding mechanisms therefor includes a vertically
movable crosshead forming the driving end and a portion of the
guiding mechanism is vertically movable from a retracted upper
position to a lower extended position against the ground surface to
provide for maximum clearance when in elevated position and
facilitate movement of the stems a distance twice that of the
piston and cylinder assembly.
Still another important object of the present invention is to
provide a hydraulically actuated cavity forming device which is
highly maneuverable, quick and efficient in forming a plurality of
cavities in a predetermined pattern and relatively inexpensive to
manufacture, operate and maintain.
These together with other objects and advantages which will become
subsequently apparent reside in the details of construction and
operation as more fully hereinafter described and claimed,
reference being had to the accompanying drawings forming a part
hereof, wherein like numerals refer to like parts throughout.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the hydraulically operated cavity
forming device of the present invention illustrating the stems
partially extended;
FIG. 2 is a side elevational view of the rear portion of the
assembly of FIG. 1 illustrating the stems extended with the
crosshead engaging the ground surface and illustrating the
relationship of the various components of the mechanism;
FIG. 3 is a vertical sectional view taken transversely of the
device, with parts in elevation, illustrating the association of
the components of the device when the stems are in fully extended
or lowered position;
FIG. 4 is a sectional view similar to FIG. 3 but with the stems
elevated;
FIG. 5 is a diagrammatic perspective view illustrating the
overdrive chain mechanism employed for moving the stems
longitudinally a distance twice that of the longitudinal extension
and retraction of the hydraulically actuated piston and cylinder
assembly;
FIG. 6 is a fragmental sectional view ilustrating the downwardly
opening hollow cavity which receives the crosshead when in elevated
position and taken substantially along a plane indicated by section
line 6--6 of FIG. 3;
FIG. 7 is a sectional view taken substantially upon a plane passing
along section line 7--7 of FIG. 2 illustrating the relationship of
the components of the mechanism;
FIG. 8 is a fragmental detailed view illustrating the position and
condition of the lower end of the stem after it has been slightly
lifted or elevated after complete insertion into the ground to form
the underground cavity.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now specifically to the drawings, the hydraulically
actuated cavity forming device of the present invention is
generally designated by reference numeral 10 and is illustrated in
combination with a carrying vehicle generally designated by the
numeral 12 which may be in the form of an articulated, wheeled
vehicle such as a "swamp buggy" which in and of itself is a
conventional four-wheeled vehicle employed in terrain not suitable
for conventional truck operation and the like. It is pointed out
that the device of the present invention may be mounted on various
types of vehicles which include a supporting framework 14 and
ground engaging propelling and steering control wheels or other
components 16.
The hydraulically actuated device includes a generally horizontally
disposed frame 18 having an upwardly extending conical member 20
rigid therewith which terminates in a horizontal top plate 22 to
which is attached a lower end plate 24 of a vertically elongated
hydraulic cylinder 26 which has a double acting piston therein and
a piston rod 28 extending downwardly therefrom through the top
plate 22. The lower end of the piston rod 28 is connected with a
crosshead generally designated by numeral 30 which is dimensioned
to be telescopingly received within the depending flange 32 which
forms a part of frame 18 so that when the crosshead 30 is elevated,
it will be within the confines of the frame 18 as illustrated in
FIG. 4.
Also connected to the crosshead 30 is a pair of upwardly extending
parallel rigid tubular members 34 and 36 which extend up through
the frame 18 and upwardly extending tubular guides 38 and 40
projecting upwardly from the frame 18 to guide the tubular members
34 and 36 during vertical movement in relation to the frame 18 as
the crosshead 30 is moved between a retracted position as
illustrated in FIG. 4 to an extended position as illustrated in
FIG. 3 in which the lower surface of the crosshead 30 engages the
ground surface. The upper ends of the tubular members 34 and 36 are
rigidly connected to a cross member 42 in the form of a plate that
extends horizontally between the upper ends of the tubular members
34 and 36 and which is movable in relation to the hydraulic
cylinder 26 with the hydraulic cylinder 26 being guided through and
in relation to the plate 42 for stabilization thereof. Thus, the
two tubular members 34 and 36 and the crosshead 30 and the cross
member 42 form a rigid rectangular frame structure which is
vertically guided by the tubular guides 38 and 40.
Longitudinally movably disposed in the tubular members 34 and 36 is
a pair of stems or posts 44 and 46 which have their lower ends
projecting below the crosshead 30. Each of the stems 44 and 46
includes a projecting lug 48 on the upper end thereof which extends
through a longitudinal slot 50 along the inner surface of each of
the tubular members 34 and 36 with the bracket or lug 48 on each of
the stems 44 and 46 projecting beyond the surface of the tubular
members 34 and 36 for guided longitudinal reciprocation. The lug 48
on the stem 44 is connected to an elongated flexible chain 50 while
the lug 48 on the stem 46 is connected to a corresponding chain 52.
The chains 50 and 52 are substantially identical in construction
and have a lower terminal end anchored to the crosshead 30 by an
anchor 54 with a vertical run of the chain then extending upwardly
and passing overtop of a pulley 56 supported from the undersurface
of the top plate 22 on the conical portion 20 of the frame 18 by a
suitable bracket 58. The chain 50 then extends downwardly and is
entrained under a pulley 60 journaled from the bracket or plate 62
on the crosshead 30. The chain then extends upwardly and is
entrained over a top pulley 64 supported by an upstanding bracket
66 on the cross member 42. The lug 48 is attached to the chain 50
between the pulleys 60 and 64 as illustrated in FIG. 5 and as can
be seen in FIGS. 3 and 4. The chain 50 then extends downwardly and
is entrained under a pulley 68 carried by a bracket 70 on the upper
surface of the plate 22 that is rigid with the frame 18. The chain
then extends upwardly and is provided with an anchored attachment
72 to cross member 42. The various pulleys are in the form of
rollers which have smooth external surfaces with peripheral
outwardly extending flanges on each end to retain a leaf-type chain
thereon. The anchor points may be provided with adjustment means to
facilitate adjustment of tautness of the chain as may be necessary.
Also, the tubular guides 38 and 40 which slidably receive the
tubular members 34 and 36 each also have a longitudinal slot 39
therein for permitting movement of the lugs 48 so that the stems 44
and 46 may move from a position adjacent the upper ends of the
tubular members 34 and 36 to a lowered position adjacent the lower
end of the tubular members 34 and 36.
In use of the invention, the crosshead 30 is installed so that it
is four feet above the ground surface. As the piston rod 28 is
extended to lower the crosshead 30 to engagement with the ground
surface, the chain and pulley arrangement will move the stems 44
and 46 a distance of eight feet beyond the crosshead 30 which is
the desired depth of detonation of an explosive charge during
underground survey work. As the crosshead 30 is elevated by
retracting the piston rod 28, the stems 44 and 46 will be retracted
twice the distance of the crosshead 30 due to the particular
arrangement of the chains and pulleys. This is accomplished by the
pulleys 56 and 68 being stationary insofar as vertical movement is
concerned and the pulleys 60 and 64 being vertically movable along
with the anchor points 54 and 72 thereby causing longitudinal
movement of the point of attachment of the lug 48 with the chain 50
to be moved downwardly to the bottom end of the slot in the tubular
member 34 so that the full desired length of the stem 44 will be
extended below the crosshead 30.
The frame 18 and its associated cone-shaped member 20, plate 22 and
guides 38 and 40 are supported from the framework 14 of the vehicle
by upwardly extending support brackets 80 carried by the frame 14
having the upper apex thereof pivotally attached to lugs 82 on the
frame or guide members 38 and 40 by a pivot pin or bolt 84 thereby
providing a transverse axis of pivotal movement for the device 10
to enable it to be pivoted from a substantially vertical operative
position to a generally inclined position with the upper end
thereof extending toward or over the top surface of the cab of the
vehicle. A hydraulically actuated piston and cylinder assembly 86
interconnects the frame 14 of the vehicle and the frame 18 at a
point below the pivot axis defined by the bolt 84 so that the
device may be power actuated to be pivoted from an operative
vertical position to and from an inoperative horizontal or
horizontally inclined position, such as when the device is being
moved to a new location to eliminate possible entanglement of the
upper end of the device with tree branches, power lines, or the
like.
Also, each of the stems 44 and 46 is provided with a spiral auger
flight 90 at the lower end thereof which forms one revolution
around each of the stems so that it will serve to auger the stems
44 and 46 into the ground in much the same manner as a screw
anchor. Each stem 44 and 46 also includes a hollow bore or
passageway 92 extending therethrough which terminates in the hollow
interior of a lower tapered end 94 below the flight 90. This
tapered end 94 is in the form of four pivotal triangular plates
which have the depending apex and the two side edges thereof free
of each other and normally oriented in a downwardly converging
relation so as they penetrate the ground, the pointed ends 94 will
facilitate insertion of the stems 44 and 46 into the ground during
rotation thereof or by merely pressing the stems into the ground in
the event the flights 90 are not used. When the stems 44 and 46
reach the bottom point of movement, the stems may be elevated or
lifted a short distance (several inches) to form a cavity 96 and
since no pressure is exerted on the pivotal plates forming the
tapered end 94, the plates swing downwardly to an open position to
provide communication between the cavity 96 and the bore 92 through
the stems 44 and 46 thus enabling an explosive charge to be
discharged into the cavity 96. The explosive charge may be in the
form of a gaseous material having supply tanks 98 carried by the
vehicle and communicated with the bore 92 through flexible hoses,
tubes, or the like, 100 which extend over a pulley 102 mounted on
the plate 42 by suitable bracket structure 104 so that the hose 100
may be moved with the stems 44 and 46 with the hose being guided
over the pulley 102. Tension springs 106 or the like may be
attached to the hoses 100 to retract the hoses when the stems are
lifted and enable downward movement of the hoses when the stems are
extended so that the explosive charge may be introduced into the
cavity and ignited by a suitable ignition device which does not
constitute any specific part of the present invention. The
hydraulic fluid for actuating the piston rod may be supplied
through hoses 108 connected to a suitable pump and tank assembly
generally designated by numeral 110 to provide for extension and
retraction of the hydraulic piston and cylinder assembly for
extending and retracting the crosshead 30 and stems 44 and 46, in a
well known manner with suitable controls being provided
therefor.
The crosshead is provided with a hydraulic motor 112 with gearbox
114 associated therewith to provide a chain drive to both of the
stems 44 and 46 with suitable hoses, pipes, or the like, providing
hydraulic pressure to the motor 112. With this construction, a
single torque arm reducer is employed and one hydraulic motor
provides rotational torque to both of the stems 44 and 46.
As an alternative arrangement, two torque arm reducers driving
individual stems may be employed which, of course, includes two
hydraulic motors each driving a stem in order to increase the
torque and rpm of the stems and in such an arrangement, a gearbox
will not be necessary. The hydraulic motors, gearbox and drive
chain connection with the stems 44 and 46 is conventional whether a
single torque arm is used or whether two torque arm reducers are
employed for independently driving the stems through a chain drive.
In either construction, the hydraulic system is connected to the
hydraulic motors in a manner to provide reverse rotational
direction thereof.
The gearbox 114 and motor 112 are connected with a housing 116
which forms the crosshead and has the chain drive and driving
connection with the stems 44 and 46 disposed interiorly thereof in
a manner well known in the art.
This device permits simultaneous insertion of two stems or poles
into the earth. In many locations, a stem of reasonable size may be
pushed directly into the soil rather than being augered by use of
the double acting hydraulic cylinder mounted in a generally
vertical position and fixed to a frame or other supporting
structure. The piston rod protruding from the cylinder is attached
to the crosshead 30 which in turn has two tubular guides 34 and 36
mounted in vertical position and braced across the top with the
cross member 42. The stems slide freely inside the guides and
protrude below the cross member. Force is transmitted from the
cylinder to the stems to move them longitudinally by the chain
system illustrated so that when the piston rod is moved downwardly,
the chain anchored to the crosshead and entrained over the pulleys
as illustrated and connected to the upper end of the stems so that
the stems move twice as fast as the piston rod and crosshead
thereby providing an overdrive arrangement. The return chain
assembly works in the same manner and this extension and retraction
mechanism also operates in the same manner when a mechanism is
incorporated into the crosshead to rotatably drive the stems 44 and
46. Thus, the unique feature of the apparatus for moving the stems
is the travelling pulleys which move the stems at twice the rate of
the cylinder stroke as well as the compactness and simplicity of
the movable guide members and the guide structure for the movable
guide members and the association of the chains and connection
between the chains and stems. This together with the movement of
the crosshead from a position adjacent the ground to a higher off
the ground position when retracted enables effective transportation
from location to location and the engagement of the crosshead with
the ground surface serves to anchor the column of dirt or soil
above the auger flight when the explosive charge is detonated.
The plate 42 may be provided with a centrally disposed tubular
guide or sleeve 43 which is rigid therewith and which is slidably
mounted on the upper end portion of the cylinder 26 to stabilize
the upper end of the cylinder 26 in relation to the vertically
movable components. Suitable cutouts or openings may be provided
for permitting passage of hydraulic hoses to enable inlet and
outlet of hydraulic fluid to the upper end of the cylinder 26 as
well as the lower end thereof. The particular orientation of all of
the hoses is not shown in detail since this particular arrangement
does not form an essential part of this invention.
The foregoing is considered as illustrative only of the principles
of the invention. Further, since numerous modifications and changes
will readily occur to those skilled in the art, it is not desired
to limit the invention to the exact construction and operation
shown and described, and accordingly all suitable modifications and
equivalents may be resorted to, falling within the scope of the
invention.
* * * * *