i12iUK Patent i19iGB (11}2
`
`B
`
`(54) Title of invention
`
`Reciprocating device
`
`(51)
`
`INT cu‘; F03c1I26
`
`(21) Application No
`3239395
`
`(22) Date of fifing
`25 Oct 1932
`
`(30) P]-iufity data
`
`(313 313432
`
`(32)
`
`5 Nov 1981
`
`(33) United States of America
`(Us)
`
`(433 Application published
`-[3 May1933
`
`(45) Patent published
`12 Mar 1986
`
`(733 Propriemrs
`lngersoll-Band Company
`(USA-Newderseyl
`200 Chestnut Ridge Road
`Woudciiff Lake
`New Jersey
`United States of America
`
`Inventor
`Ewaid H. Kurt
`
`Agent andlor
`Add'e55f°' Sewice
`Raworth, Moss &Cook.
`36 Sydenham Road.
`Crovdom
`Surrey CR0 ZEF
`
`(52) Domesticclassification
`FIW1081 ‘ID 230 CM
`ETFEH
`U‘lS1761 E1FF1W
`
`(56) Documents cited
`GBA20D8187
`GB 1558685
`GB 1555754
`GB1541314
`GB 1515566
`GB 1202246
`
`(58) Field of search
`F1W
`BF
`
`LONDON THE PATENT OFFICE
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`8176980LZ85)
`
`NOV
`
`Exhibit 2010
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` NOV
`Exhibit 2010
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`

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`mmummmE
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` NOV
`Exhibit 2010
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`

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`Reciprocating Device
`
`This
`
`invention pertains
`
`to a hydraulic
`
`reciprocating
`
`device for a hydraulic reciprocating drill,
`
`wherein,
`
`a
`
`piston member continuously communicates with pressurized
`fluid
`pneumatic
`on
`one
`side
`and
`intermittently
`communicates with a hydraulic pressure source on the other
`
`side.
`
`Fluid reciprocating devices have found many uses, such as
`
`down—the—hole drilling.
`
`The fluid reciprocating devices
`
`include
`
`both
`
`pneumatic
`
`and
`
`devices.
`
`It
`
`is
`
`desired
`
`hydraulic
`to
`
`obtain
`
`reciprocating
`8.
`
`hydraulic
`
`reciprocating
`
`device
`
`that
`
`reciprocates
`
`as
`
`fast
`
`as
`
`pneumatic reciprocating devices but uses less energy.
`
`U.S. Patent 2,876,7H2 to Sherrill relates to a variable
`
`speed fluid pressure actuated
`
`impact device,
`
`and more
`
`particularly,
`
`to a device of
`
`this character of a type
`
`wherein the
`
`impact member
`
`is
`
`rotatable.
`
`The device
`
`includes a rotating valve driven by an external motor.
`
`U.S. Patent 3,327,790 to Vincent et al relates to a fluid
`
`actuated tool for applying repeated percussive blows to a
`
`drill bit
`
`in the drilling of oil
`
`and gas wells.
`
`particular,
`
`the patent concerns
`
`percussive motors
`
`In
`
`for
`
`incorporating
`
`in drill strings causing drill bits
`
`to
`
`vibrate or oscillate axially at
`
`the same time they are
`
`being rotated for the drilling of such wells.
`
`U.S. Patent 2,H02,3OO to Shimer relates to fluid actuated
`
`mechanisms and systems.
`
`A rotary valve is employed to
`
`port fluid alternatively to opposite ends of a piston.
`
`U.S. Patent 3,H8fl,2OH to Caviness relates to a reactor for
`
`mixing viscous liquids under
`
`inert conditions and more
`
`NCfi/
`
`EXNbH201O
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` NOV
`Exhibit 2010
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`

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`-2-
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`particularly to a reactor having a plunger—type agitator
`
`for reacting highly viscous liquids under inert conditions
`
`in very small quantities. The device has a rotating valve
`
`which supplies pressure alternatively to the end of a rod.
`
`U.S. Patent 4,103,591 to Reiersdal relates to a device for
`
`hydraulically driven percussion hammer for activating a
`
`tool,
`
`especially intended as
`
`a drilling hammer.
`
`The
`
`device discloses a rotating valve that admits oil
`
`to a
`
`chamber and then vents the oil
`
`to a return line.
`
`The
`
`impact piston is driven upwards by this oil
`
`so that
`
`a
`
`surface on the top of the piston is charged with pressure
`
`and accumulated. When the bottom end of
`
`the piston is
`
`vented as the rotary valve turns,
`
`the piston is driven
`
`downwards by the accumulated pressure.
`
`According to the present
`
`invention there is provided a
`
`reciprocating device for a downhole drill comprising:
`
`a
`
`housing; a first piston in said housing, said first piston
`
`having
`
`an operating
`
`surface; means
`
`for
`
`alternately
`
`communicating said first piston operating surface with a
`
`hydraulic fluid supply and a hydraulic fluid return;
`
`a
`
`second piston in said housing, said second piston having
`
`an
`
`operating
`
`surface;
`
`means
`
`for
`
`continuously
`
`communicating said second piston operating surface with a
`
`supply of pneumatic fluid whereby the pistons move in an
`
`impact
`
`direction when
`
`the
`
`hydraulic
`
`fluid
`
`supply
`
`communicates with said first piston operating surface and
`
`the pistons move
`
`in a return direction when the first
`
`piston operating surface communicates with the hydraulic
`
`fluid return; and means for venting said pneumatic fluid.
`
`The pneumatic supply may be used to provide cleaning fluid
`
`to purge chips from the hole which result from drilling.
`
`An embodiment of the invention will now be described by
`
`way of example with reference to the accompanying drawings
`
`in which:-
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`NCfi/
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`EXNbH201O
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` NOV
`Exhibit 2010
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`

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`-3-
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`Figure 1
`
`is a schematic illustration of a hydraulic
`
`down-the-hole drill, and
`
`Figure 2
`
`is a schematic illustration of’
`
`a crossa
`
`section of a hydraulic down-the—hole drill.
`
`Referring to Figure
`
`1,
`
`a
`
`reciprocating
`
`device
`
`for
`
`a
`
`hydraulic drill
`
`10 is shown.
`
`The device 10 comprises a
`
`housing.
`
`The housing may be a single section or multiple
`
`section such as sections
`
`12,
`
`14,
`
`16 and 18 as shown in
`
`Figure 1.
`
`Located in the housing
`
`is a piston member
`
`having a first surface and a second surface. As shown in
`
`Figure 1,
`
`the piston member
`
`is comprised of two separate
`
`members,
`
`that is a first piston 20 and second piston 22.
`
`First piston 20 has a first surface 26 and second piston
`
`22 has a second surface 28.
`
`A means for intermittently
`
`communicating the first surface of
`
`the piston 20 with
`
`hydraulic fluid is provided. The means for intermittently
`
`communicating includes a rotating valve 30 having a port
`
`32 which alternately communicates with a hydraulic fluid
`
`supply 35 and a hydraulic fluid return 36. Rotating valve
`
`30 may be rotated by conventional means such as a motor
`
`38.
`
`A
`
`means
`
`is
`
`also
`
`provided
`
`for
`
`continuously
`
`communicating the second surface of
`
`the piston 22 with
`
`pressurized pneumatic fluid.
`
`In. Figure 1
`
`a pneumatic
`
`supply H0 is shown.
`
`According to the embodiment of this invention as shown in
`
`Figure 1, pneumatic supply #0 communicates with second
`
`surface 28 by means of passage #2 which extends through
`
`sections
`
`12,
`
`1%,
`
`16
`
`and
`
`18.
`
`This
`
`tends
`
`to move
`
`the
`
`pistons in a second direction shown as direction B.
`
`When
`
`valve 30 is positioned such that hydraulic fluid supply 3H
`
`does not communicate with first surface 26,
`are allowed to move in direction B.
`
`the pistons
`
`As valve 30 rotates
`
`port 32 communicates with hydraulic fluid supply 3H.
`
`Thus
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`first surface 26 communicates with hydraulic supply 33 by
`
`means of passage 44.
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`The communication is done
`
`in an
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`NCfi/
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`EXNbH201O
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` NOV
`Exhibit 2010
`
`

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`_H-
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`intermittent manner.
`
`When
`
`hydraulic
`
`supply
`
`34
`
`communicates with first surface 26 the pressure of
`
`the
`
`hydraulic supply 34
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`times
`
`the
`
`surface area of first
`
`surface 26
`
`is greater
`
`than the pressure of pneumatic
`
`supply H0 times the area of second surface 28 which causes
`
`the
`
`pistons
`
`to move
`
`in a
`
`first direction
`
`shown
`
`as
`
`direction A.
`
`The device as
`
`shown
`
`in Figure
`
`1
`
`has
`
`a
`
`percussive
`
`direction A
`
`drill bit
`
`#6.‘ As
`
`the
`
`piston 22 moves
`
`in
`
`it
`
`impacts bit
`
`46 producing a percussive
`
`drilling affect.
`
`This device is used for down—theLhoie
`
`drilling.
`
`Rotary movement is supplied to the percussive
`
`bit #6 by rotating the housing. The housing is rotated by
`
`conventional means known to those skilled in the art and
`
`is
`
`not
`
`shown.
`
`As
`
`shown
`
`in Figure
`
`2,
`
`the
`
`spline
`
`arrangement of
`
`the
`
`percussive bit
`
`#6
`
`and
`
`the housing
`
`allows
`
`for
`
`the rotational
`
`and percussive movement of
`
`percussive bit 46.
`
`In the embodiment shown in the Figures the pistons form a
`
`two-piece construction with the space between the pistons
`
`vented. This eliminates any alignment problems associated
`
`with two piston sealing diameters.
`
`The venting of
`
`the
`
`_ pneumatic
`
`fluid occurs
`
`by means of
`
`the fluid passing
`
`between second piston 22 and section
`
`1% towards first
`
`piston 20.
`
`The pneumatic fluid then passes around first
`
`piston 20 by means of spiral groove 48 to port 50.
`
`From
`
`port 50 the pneumatic fluid passes through passage 52 to
`
`vent.
`
`When the device is employed as a percussive down-the—hole
`
`drill,
`
`pneumatic supply H0 may additionally be used to
`
`provide cleaning fluid which may purge chips from the hole
`
`which result from the drilling.
`
`This may be accomplished
`
`by continuous venting of pneumatic supply #0 past second
`
`piston 22 or by intermittent
`
`blow—by
`
`venting
`
`wherein
`
`cleaning fluid is permitted into the hole by means of an
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`NCfi/
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`EXNbH201O
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` NOV
`Exhibit 2010
`
`

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`exhaust
`
`tube as
`
`second piston 22
`
`reciprocates.
`
`The
`
`details for utilizing cleaning fluid to purge chips from
`
`the hole are known to those skilled in the art such as
`
`those taught
`
`in U.S. Patent No.
`
`ll,O8lI,6l£6 to Kurt.
`
`It is
`
`believed when small drills are employed the continuous
`
`leakage method is preferred but when large drills are
`
`used,
`
`the intermittent method is preferred.
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`NOV
`
`Exhibit 2010
`
` NOV
`Exhibit 2010
`
`

`
`CLAIMS:
`
`1!
`
`A.
`
`reciprocating
`
`device
`
`for
`
`a
`
`downhole
`
`drill
`
`comprising:
`
`a housing;
`
`a first piston in said housing,
`
`said first piston having an operating surface; means for
`
`alternately communicating said first piston operating
`surface witri a hydraulic fluid supply and a hydraulic
`
`fluid return; a second piston in said housing, said second
`
`piston having an operating surface; means for continuously
`
`communicating said second piston operating surface with a
`
`supply of pneumatic fluid whereby the pistons move in an
`
`impact
`
`direction
`
`when
`
`the
`
`hydraulic
`
`fluid
`
`supply
`
`communicates with said first piston operating surface and
`
`the pistons move
`
`in a return direction when the first
`
`piston operating surface communicates with the hydraulic
`
`fluid return; and means for venting said pneumatic fluid.
`
`2|
`
`in which the pneumatic
`A device according to claim 1
`supply is used to provide cleaning fluid to purge chips
`
`from the hole which result from drilling.
`
`3.
`
`A reciprocating device according to claim 1 or 2,
`
`wherein
`
`the means
`
`for alternately communicating
`
`the
`
`operating surface of
`
`the first piston with a hydraulic
`
`supply and with a hydraulic return comprises a rotatable
`valve.
`
`3.
`
`A
`
`reciprocating
`
`device
`
`for‘
`
`a
`
`drill
`
`arranged,
`
`constructed and
`
`adapted to operate
`
`substantially
`
`as
`
`hereinbefore described with reference to the accompanying
`
`drawings.
`
`5.
`
`A drill comprising a reciprocating device according
`
`to any preceding claim and a percussive bit wherein the
`
`second piston impacts on the bit when the pistons move in
`
`the impact direction.
`
`NCfi/
`
`EXNbH201O
`
` NOV
`Exhibit 2010