Source: http://www.google.com/patents/US5318140?dq=%22Meaning-based+advertising+and+document+relevance+determination%22
Timestamp: 2016-10-01 22:06:57
Document Index: 20835859

Matched Legal Cases: ['art 7', 'art 8', 'art 8', 'art 17', 'art 17', 'art 14', 'art 7', 'art 8', 'art 7', 'art 14', 'art 7']

Patent US5318140 - Fluid operated drill apparatus - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsDown-the-hole drill comprising a housing (1), a hammer piston (6) movable to-and-fro in the housing and intended for impacting a drill bit (5). A back piece (3) provided with an extension (12) with a valve part (17) cooperates with a part (8) of a central channel in the hammer piston. This part of the...http://www.google.com/patents/US5318140?utm_source=gb-gplus-sharePatent US5318140 - Fluid operated drill apparatusAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS5318140 APublication typeGrantApplication numberUS 07/992,247Publication dateJun 7, 1994Filing dateDec 14, 1992Priority dateDec 20, 1991Fee statusPaidAlso published asCA2085425A1, CA2085425C, DE69211514D1, DE69211514T2, EP0549549A1, EP0549549B1Publication number07992247, 992247, US 5318140 A, US 5318140A, US-A-5318140, US5318140 A, US5318140AInventorsBerndt Ekwall, Torbjorn Jakobsson, Martin PetersonOriginal AssigneeUniroc AbExport CitationBiBTeX, EndNote, RefManPatent Citations (9), Referenced by (13), Classifications (7), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetFluid operated drill apparatus
US 5318140 AAbstract
Down-the-hole drill comprising a housing (1), a hammer piston (6) movable to-and-fro in the housing and intended for impacting a drill bit (5). A back piece (3) provided with an extension (12) with a valve part (17) cooperates with a part (8) of a central channel in the hammer piston. This part of the central channel comprises a zone (16) with larger diameter than adjacent parts at an intermediate part of this part. This results in that pressure medium can pass the valve part when it is situated at the zone and that the valve part and the hammer piston sealingly cooperate when the valve part is on either side of the zone.
1. A fluid operated drill apparatus comprising a housing (1), a rear element (3) mounted to a rear end (2) of the housing, a drill bit (5) mounted to a front end 94) of the housing and a hammer piston (6) reciprocally movable within the housing for impacting against an end of said drill bit as said hammer piston moves in a direction towards said front end of said housing, the hammer piston defining a central channel which at its end towards the drill bit has a first part (7) with a first diameter and at its end towards the rear element has a second part (8) with a larger diameter than said first part, the hammer piston including an annular section (9) which is movable together with said hammer piston relative to a cutout (10) in the housing for controlling the supply of a pressure medium to a first chamber (11) situated in front of the hammer piston, the rear element (3) having an extension (12) extending from said rear element in a direction towards said front end for controlling the supply of said pressure medium to said central channel from a second chamber (13) situated about the extension and continuously pressurized during operation, said second part (8) comprising an intermediate portion disposed between two end portions of said second part, said intermediate portion comprising a zone (16) having a larger diameter than said end portions, said extension 912) having a valve element (17) mounted thereto such that said pressure medium passes said valve element (17) when said zone passes the valve element, said valve element (17) and said second part (8) cooperating to prevent said pressure medium from passing said valve element when the valve element is situated on either side of said zone (16).
The present invention relates to a down-the-hole drill of the kind where the movement of the hammer piston controls the supply of pressure medium to the forward and rearward end surfaces of the hammer piston for the driving of the hammer piston in a to-and-fro movement.
The present invention aims at achieving a down-the-hole drill where the impact frquency and the impact energy are higher than in prior art down-the-hole drills. Furthermore, the invention aims at achieving a down-the-hole drill where the amount of pressure medium needed is comparatively low in relation to the output power of the machine.
The invention is exemplified below with reference to the accompanying drawings in which
The down-the-hole drill according to FIGS. 1-3 comprises a housing 1 provided with a rear end 2 and a front end 4. At the rear end a back piece 3 is arranged for connection of the down-the-hole drill to a not shown tube string. The back piece is for this purpose provided with a thread 20. At the front end a drill bit 5 is arranged. The drill bit is provided with a flushing channel 25 and a diameter reduction 26. The drill bit 5 is guided by bushings 21 and 23 and prevented from falling out of the down-the-hole drill by a stop ring 22. Bushing 23 is screwed into housing 1. The rotation of the not shown tube string is transferred via housing 1 and a splines connection 24 to the drill bit 5. The drill bit is provided with a tube piece 27 which together with the hammer piston 6, movable to-and-fro in housing 1, forms a foot valve. The housing 1 is provided with a cutout 10 for cooperation with an annular section 9 on the hammer piston. The hammer piston is on each side of the annular section provided with a turndown 18 and 19 respectively. At the front end of the hammer piston 6, which has the same diameter as the annular section 9, the hammer piston is provided with a number of grooves 28 distributed around the periphery of the hammer piston. In the same way the rear end of the hammer piston, which has the same diameter as the annular section 9, is provided with grooves 29. The hammer piston is internally provided with a central channel which comprises a first part 7 with a first diameter and a second part 8 with larger diameter. The second part of the central channel comprises a zone 16 with larger diameter than the other parts of the second part 8. This zone is situated at an intermediate part of the second part. Through this the hammer piston can sealingly cooperate with a valve part 17 on an extension 12 on the back piece 3 when the valve piece 17 is situated on either side of the zone 16 and allow passage of pressure medium when the valve part 17 is at the zone 16. Pressure medium for the driving of the down-the-hole drill is supplied via channel 30, check valve 31, chamber 32, holes 33, channel 34 and holes 35 to a second chamber 13 which is arranged about the extension 12 and during operation continuously pressurized. Chamber 13 is continuously connected with the turndown 19 via the grooves 29 and the slot 36 between the hammer piston 6 and the housing 1. A first chamber 11 situated in front of the hammer piston is continuously connected with the turndown 18 via the grooves 28. The extension is provided with a tube formed part 14 which extends into the first part 7 of the central channel in the hammer piston. The tube formed part is provided with holes 15 which form pressure medium connection between the second part 8 and the first part 7 when the hammer piston is situated in the position shown in FIG. 1. This pressure medium connection is controlled by the hammer piston 6 which in the positions shown in FIGS. 2 and 3 prevents pressure medium from passing through the holes 15. Because the tube formed part 14 all the time extends into the first part 7 of the central channel the risk of damaging the tube formed part and the hammer piston 6 is decreased. Back piece 3 comprises a sleeve 38 about which a ring 40 of elastic material is arranged and holes 39. At certain drilling conditions it is desirable to supply flushing medium at the rear end of the down-the-hole drill. In such a case one can provide sleeve 38 with radial holes under the elastic ring 40 which then will operate as a check valve.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS2837317 *Feb 15, 1957Jun 3, 1958Ingersoll Rand CoHole cleaning deviceUS2937619 *Feb 11, 1957May 24, 1960Ingersoll Rand CoHole cleaning deviceUS2951467 *Nov 6, 1958Sep 6, 1960Ingersoll Rand CoRock drillUS3095047 *Sep 15, 1961Jun 25, 1963Gulf Research Development CoHammer drillUS3379261 *May 23, 1966Apr 23, 1968Leo A. MartiniPercussion toolUS3692122 *Dec 23, 1970Sep 19, 1972Baker Oil Tools IncHigh frequency pneumatically actuated drilling hammerUS4819746 *Dec 18, 1987Apr 11, 1989Minroc Technical Promotions Ltd.Reverse circulation down-the-hole hammer drill and bit thereforUS4958691 *Jun 16, 1989Sep 25, 1990James HippFluid operated vibratory jar with rotating bitUS5139096 *Sep 14, 1989Aug 18, 1992William ListerPneumatic percussion hammers* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS5413185 *May 12, 1992May 9, 1995Powermole International Ltd.Soil displacement hammer with movable headUS5564510 *Dec 14, 1994Oct 15, 1996Walter; Hans-PhilippPneumatic drill hammerUS5662180 *Oct 17, 1995Sep 2, 1997Dresser-Rand CompanyPercussion drill assemblyUS5787995 *Dec 7, 1995Aug 4, 1998Atlas Copco Rock Drills AbWater driven hammer deviceUS5957220 *Sep 30, 1996Sep 28, 1999Dresser-Rand CompanyPercussion drill assemblyUS6050346 *Feb 12, 1998Apr 18, 2000Baker Hughes IncorporatedHigh torque, low speed mud motor for use in drilling oil and gas wellsUS6543557 *Mar 27, 2001Apr 8, 2003Bernard Lionel GienDrill hammer assemblyUS9016404 *Aug 20, 2010Apr 28, 2015Tracto-Technik Gmbh & Co. KgRam boring deviceUS20040130841 *Dec 17, 2003Jul 8, 2004Murphy Timothy A.Method and apparatus for providing an integrated communications, navigation and surveillance satellite systemUS20120228031 *Aug 20, 2010Sep 13, 2012Tracto-Technik Gmbh & Co. KgRam boring deviceEP0992747A2 *Oct 4, 1999Apr 12, 2000Kabushiki Kaisha Toyoda Jidoshokki SeisakushoAir conditioning systemsWO1999041483A1 *Feb 12, 1999Aug 19, 1999Baker Hughes IncorporatedHigh torque, low speed mud motor for use in drilling oil and gas wellsWO1999057411A1May 4, 1999Nov 11, 1999Permon S.R.O.Pneumatic submersible boring tool* Cited by examinerClassifications U.S. Classification175/296, 173/80, 175/298, 173/78International ClassificationE21B4/14Cooperative ClassificationE21B4/14European ClassificationE21B4/14Legal EventsDateCodeEventDescriptionFeb 28, 1994ASAssignmentOwner name: UNIROC AB, SWEDENFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:EKWALL, BERNDT;JAKOBSSON, TARBJORN;PETERSON, MARTIN;REEL/FRAME:006894/0568Effective date: 19921127Sep 25, 1997FPAYFee paymentYear of fee payment: 4Sep 27, 2001FPAYFee paymentYear of fee payment: 8Nov 14, 2005FPAYFee paymentYear of fee payment: 12RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services