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| Number | Title | Issue Date |
| 7325599 | Safety shield for rotary drilling rigs This invention relates to a novel safety shield for rotary drilling rigs. More particularly, the invention pertains to a portable, clam-shell style extendible leg safety shield which can be readily installed on the ground around the drill stem of an operational dril... | 02/05/2008 |
| 7128168 | Reamer apparatus for ground boring machine The invention provides a reamer apparatus for a ground boring machine that is capable of restricting increase in drawing resistance when performing drawing of a buried pipe by using a reamer and of efficiently performing drawing operations of the buried pipe without... | 10/31/2006 |
| 7080702 | Rotating deck bushing with dust guard system A rotary deck bushing having an outer body held in a fixed orientation within a drill deck and an inner bushing portion that is configured for rotatable positioning within the outer body portion. A floating center bushing is removable positioned within the inner bus... | 07/25/2006 |
| 7011167 | Device for sealing a drill hole and for discharging drillings or stripped extraction material In a device for sealing a bore hole and discharging drill cuttings and stripped excavation material, including a housing adapted to receive sealing elements and an opening capable of being connected to the bore hole, one side wall of the housing is provided with at ... | 03/14/2006 |
| 6994628 | Locking swivel apparatus with replaceable internal gear members A locking swivel apparatus is provided. The locking swivel includes an upper body portion having a counter bore about a cylindrical axis and a mandrel receivable in the counter bore. The apparatus further includes a locking arrangement, including at least one replac... | 02/07/2006 |
| 6915865 | Locking swivel apparatus with a supplemental internal locking mechanism A locking swivel apparatus is provided. The locking swivel includes an upper body portion having a counter bore about a cylindrical axis, a mandrel receivable in the counter bore, and a lower cap member threadably engaged with the upper body portion. The apparatus f... | 07/12/2005 |
| 6848520 | Bushing for a drilling rig A bushing for retaining a spider and comprising a basket portion having an opening in its upper end and a base at its lower end, there being a further opening in the base to allow a tubing string to extend substantially axially through the basket portion. The bushin... | 02/01/2005 |
| 6651737 | Collar load support system and method A wellbore tubular handling system and method is provided for operation in holding and lowering tubulars, such as tubing strings, casing strings, pipe strings, and the various components thereof, at a rig site. The handling system utilizes a shock table w... | 11/25/2003 |
| 6386283 | Elevator and spider converter Shaped plates are provided, one above each side of a spider, to replace the bails and links used to suspend the spider and its pipe payloads. The load applied to the housing suspension hard points, whether ears or lugs, to suspend the spider is transferre... | 05/14/2002 |
| 6089338 | Flush mounted self aligning spider A spider for use within the rotary table opening has all movable elements flush with or below the rig floor. The conventional wedge shaped slips are supported and aligned by a slip carrier that has a spherical outer surface that slideably mates with a sph... | 07/18/2000 |
| 5996712 | Mechanical locking swivel apparatus A mechanical swivel apparatus which has a first upper body portion threadably attached to the lower end of a side entry sub apparatus, and a second lower portion which is threadably attached to a section of drill pipe, the apparatus positionable above the... | 12/07/1999 |
| 5263899 | Cylindrical telescopic kelly-bar apparatus A kelly-bar apparatus includes, for example, an inner kelly-bar, a second kelly-bar and an outer kelly-bar. These kelly-bars are relatively telescopically operable and torque is transmitted from outside to inside. When the second and outer kelly-bar are i... | 11/23/1993 |
| 5107941 | Kelly saver drive A split, solid mass, drive bushing-drive plate for use when a kelly is used to sever a length of well casing. The invention fits into the master bushing and prevents wear on the corners between the flat sides of the kelly.... | 04/28/1992 |
| 4328857 | Mounting device for heat recovery wheels Disclosed is a mounting device for a ceramic heat recovery wheel having a central bore therein. A metal hub is situated in the bore having a plurality of radially movable shoes for fastening the hub to the wheel. The radially movable shoes each have a rad... | 05/11/1982 |
| 4317493 | Kelly drive bushing adapter An adapter is provided for positioning a kelly drive bushing of a surface drilling assembly in spaced relationship to an associated rotary table. The adapter permits the wireline of an electronic steering assembly to pass through the central aperture in t... | 03/02/1982 |
| 4312404 | Rotating blowout preventer Improved rotating blowout preventer including a stationary housing, a bearing housing and a bearing means assembly and seal assembly for mounting an internally located, rotating sleeve for rotating, sealable movement within the bearing housing. The bearin... | 01/26/1982 |
| 4285215 | Rotary table and kelly guard A kelly bushing guard which encapsulates the rotating parts of a rotary table of a rotary drilling rig. The guard includes a shoe which rests on the fixed floor area of the table. The rotating center is located inwardly of the shoe. A bearing member has a... | 08/25/1981 |
| 4254638 | Positive release means for articulated flexible shaft A flexible shaft is formed of a plurality of linked sections which lock together to provide a rigid shaft when turned in a first direction as for drilling and which, when turned in the opposite direction, unlatch, thereby permitting limited relative movem... | 03/10/1981 |
