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| Number | Title | Issue Date |
| 7406887 | Pumping unit with variable work stroke and return stroke torque factor characteristics A pumping unit system having vertical sampson post, a walking beam pivotally supported at the upper end of the sampson post and a horsehead affixed at a forward end thereof that supports a reciprocated sucker rod string, including a gear reducer mounted at selectabl... | 08/05/2008 |
| 7341122 | Actuator for a working element, particularly a walking robot and the method of controlling said actuator The invention relates to an actuator which is characterized in that the kinematic connection between the motor and the working element of the robot comprises a mobile link which is pivot fixed to the base of the actuator, a runner which is mounted to the mobile link... | 03/11/2008 |
| 7220184 | Adjustable seesaw A seesaw includes a manually rotatable actuator for adjusting the balance of the seesaw to accommodate a weight differential between two riders. After adjusting the seesaw, the actuator automatically locks the adjustment mechanism in place. A rack-and-pinion assembl... | 05/22/2007 |
| 7100469 | Hypoid reducing device A hypoid reducing device that allows the coupling/connection between a hypoid gear set and a motor to be more flexible and have a wider applicability. A hypoid pinion shaft is supported by two bearings in a bearing case portion in a gear case. A hypoid pinion engage... | 09/05/2006 |
| 7077023 | Toroidal continuously variable transmission In a toroidal continuously variable transmission, a roller-and-cage bearing assembly is interleaved between a power-roller outer ring and a trunnion power-roller accommodating portion to permit a parallel translation of a power roller in an axial direction of input ... | 07/18/2006 |
| 7036584 | Method and system for accessing a subterranean zone from a limited surface area A method and system for accessing subterranean resources from a limited surface area includes a first well bore extending from the surface to the target zone. The first well bore includes an angled portion disposed between the target zone and the surface to provide ... | 05/02/2006 |
| 6655224 | Downward offset barbell type walking beam compositively balance oil pump A downward offset barbell type walking beam compositively balance oil pump, in which at the rear end of the walking beam is mounted a downward offset barbell type balancing device consisting of a shoe plate, a cross shaft and balancing pieces, retains mos... | 12/02/2003 |
| 6450050 | Walking beam balanced span and moment regulating economized oil pump and a stroke regulating device of the same A walking beam balanced span and moment regulating oil pump having an arc, a walking beam, a support, a pitman, a base, a crank, a decelerator, a power machine, and a string device. The upper part or the lower part of the front end of a boom is articulate... | 09/17/2002 |
| 6386322 | Method and apparatus for oil well pumping A walking beam pumping system is disclosed wherein the pumping system's prime mover is gravity. In one embodiment, the system comprises a walking beam pivotally coupled to a support structure at a pivot point substantially central along the length of the ... | 05/14/2002 |
| 6265786 | Turbogenerator power control system A power control system for a turbogenerator which provides electrical power to pump-jack oil well. When the induction motor of a pump-jack is powered by three-phase utility power, the speed of the shaft varies only slightly over the pumping cycle but the ... | 07/24/2001 |
| 6253631 | Pumping unit lock down apparatus A lock down apparatus for use with an oil well pumping unit of the walking beam type. It includes upper and lower clamps for attachment to the walking beam and to the bottom frame of the unit, respectively, and an adjustable tensioning arrangement extendi... | 07/03/2001 |
| 6015271 | Stowable walking beam pumping unit An improved beam pumping unit for pumping fluids from a well having a foldable support structure to allow storage of the pumping unit in a low profile position. The beam pumping unit utilizes a walking beam pivoted on a central bearing, a drive means conn... | 01/18/2000 |
| 5957796 | Belt guard A cover for a pump jack includes a main rear wall with two slots for engaging over a pair of shafts of the pump jack at the drive belt on the pulleys on the drive shafts. The rear cover portion includes a peripheral wall extending around the sides and top... | 09/28/1999 |
| 5829958 | Pumping unit with speed reducing means A pumping unit comprising a supporting post and a walking beam, having a head end and a tail end, pivotally connected to the post to allow for rocking of the beam about a horizontal pivot axis. The head end is connected to a vertical pump rod. The walking... | 11/03/1998 |
| 5735170 | Pumping unit with dynamic fluid ballast A pumping unit apparatus is provided for operating a well pump having sucker rod drive which is reciprocated from an uppermost position to a lowermost position, the apparatus having a base, a support structure mounted on the base, a member mounted on the ... | 04/07/1998 |
| 5730671 | Gear reduction box A gear reduction box designed to be integrated into an existing oil field pumping unit to reduce the gear ratio and thereby reduce the size of the motor needed to operate the pumping unit. More specifically, the invention is a gear reduction box including... | 03/24/1998 |
| 5549156 | Shock absorber & Wiper A safety shock absorber and wiper for use in an oil well pumping unit and attached to the top of a stuffing box. The shock absorber and wiper is constructed of a high density elastomeric material which is designed to absorb the shock created in the event ... | 08/27/1996 |
| 5528947 | Rod pumping assembly A rod pumping unit used in the oil field, which has high efficiency and saves power, characterized in that: for the connection of the 2ω crank and the main crank in the 2ω crank balance device there is provided a differential phase adjusting mechanism, ... | 06/25/1996 |
| 5309992 | Pulley-drive lifting system An improved lifting system is disclosed for pumping liquid such as oil from a subterranean pump using a band-and-pulley assembly. The device uses a single-piece band shaped in the form of an elongated loop. Both intermediate lengths of the looped band are... | 05/10/1994 |
| 5253541 | Oil well pumping mechanism A pumping mechanism particularly adapted for coupling a rotating prime mover to the sucker rod of an oil well lift pump is disclosed. A linkage assembly comprised of a V-shaped floating link and two grounded links provides straight line, reciprocating mot... | 10/19/1993 |
| 5105671 | Well pumping unit with adjustable balance beam A well pumping unit utilizing a walking beam that is longitudinally adjustable in length in order to vary the ratio of the length between the fulcrum point of the beam and the end of the beam connected with a pump rod as compared to the length of the beam... | 04/21/1992 |
| 5101676 | Attachment for sucker rod depth adjustment A sucker rod depth adjusting attachment for conventional oil well surface units for operating down-hole pumps includes a cross bar which rests atop the existing carrier bar and supports a matching adjusting bar by means of interconnecting, adjustable leng... | 04/07/1992 |
| 4997346 | Well pumping systems The present invention provides a method and apparatus for eliminating at least a portion of the energy losses in a well pumping system which are due to "regeneration" (i.e. those periods during the pumping cycle in which the pumping system experiences neg... | 03/05/1991 |
| 4788873 | Portable walking beam pump jack A portable walking beam pump jack for use in pumping liquids from an oil well having an elongated frame and an axle with wheels thereon mounted transversely on the frame for providing rolling transportation. Stabilizer pads are provided for securing the f... | 12/06/1988 |
| 4743172 | Belt driven pumping unit A pumping unit has a drive train comprising a very large mass including large diameter series connected sheaves, one of which is a large crank sheave. The crank sheave is directly connected to a pitman arm which oscillates a walking beam, which in turn re... | 05/10/1988 |
| 4727760 | Connection between the equalizer beam and the walking beam of a walking beam type oil well pumping unit The invention is directed to a connection between the equalizer beam and the walking beam in a walking beam type oil well pumping unit, the walking beam having a tail shaft rotatably mounted generally perpendicular to the longitudinal axis of the beam. Th... | 03/01/1988 |
| 4723452 | Belt driven pumping unit A pumping unit has very large series connected crank and flywheel sheaves. The crank sheave is connected to oscillate a walking beam which reciprocates a horsehead attached to a bridle. The bridle is connected to a polished rod associated with a downhole ... | 02/09/1988 |
| 4718825 | Active control system for high speed windmills A pump stroke is matched to the operating speed of a high speed windmill. The windmill drives a hydraulic pump for a control. Changes in speed of a wind driven shaft open supply and exhaust valves to opposite ends of a hydraulic actuator to lengthen and s... | 01/12/1988 |
| 4715240 | Pumping device The following specification discloses an apparatus and method for providing lifting motion on a substantially symmetrical and compact basis for a pump through a linkage, comprising two members pivotally coupled for relative movement driven by a gear reduc... | 12/29/1987 |
| 4703665 | Well pumping unit A pumping unit has a short base frame and interchangeable crank arms, while retaining a relatively low net peak torque requirement obtained through a slower upstroke and a faster downstroke.... | 11/03/1987 |
| 4686862 | Low profile pump jack A pump jack for reciprocating a string of rods in a well is disclosed in which a drive shaft having an axis below the axis of a guide wheel supported above the wall has a crank arm mounted to each end of the drive shaft for rotation therewith, counterweig... | 08/18/1987 |
| 4683764 | Pump drive for deep well pumping installations A tiltable horse-head shaped transmission part at the end of a rocking beam of a cornish type pump drive, is pivotably supported at one end portion of the rocking beam. The rocking beam is pivotably supported on a stationary stand. The horse-head transmis... | 08/04/1987 |
| 4681515 | Walking beam pump having adjustable crank pin Variable stroke pump apparatus includes a photovoltaic array for providing electrical current to motors, one of which provides for the pumping action of a walking beam, one of which provides for movement of a control unit which varies the length of stroke... | 07/21/1987 |
| 4671126 | Walking beam pumping unit The walking beam of a pumping unit is suspended from an oscillating hanger arm. It is pivoted at one end to a crank and to a link, the other end of the latter being pivoted to a fixed position shaft. At the other end of the walking beam is a point which f... | 06/09/1987 |
| 4665761 | Long stroke pumping unit A long stroke pumping unit comprising a tower mounted on a base and a counterweight-polished rod system which bestrides a top wheel mounted on the top of said tower, employs an electric motor as its prime mover. The motor rotates in a fixed direction, and... | 05/19/1987 |
| 4660426 | Pumping unit for actuating a down hole pump with static and dynamic counterweights A pumping unit for actuating a down hole pump is disclosed for a pumping units of the type wherein a counterweight is mounted on a beam to balance a down hole load consisting substantially of pump rods. One end of the beam includes a static counterweight ... | 04/28/1987 |
| 4651578 | Well pumping unit An improved oil well pumping unit has an arc latch which is remotely actuable so that a workman is not required to climb onto, or be in the immediate vicinity of the arc, in order to move the arc to an inoperative position spaced from the centerline of th... | 03/24/1987 |
| 4631970 | Pumping unit A pumping unit for pumping fluids from a location beneath the surface of a field. The rotary motion of a crankarm is changed to a reciprocating motion of a pair of flexible members by pitman arms pivotally secured at one end to the crankarm and at the oth... | 12/30/1986 |
| 4603592 | Off-vertical pumping unit A pumping unit or pump jack, of the walking beam type of class I geometry, is provided which is arranged to permit relatively efficient pumping of a well inclined to the vertical, by suitable selection of beam support configuration and location, horsehead... | 08/05/1986 |
| 4586879 | Well pumping unit A well pumping unit for use in association with an oil well, water well or the like having a downhole pump operated by a reciprocating pump rod with the pumping unit including a pair of large diameter rotatable wheels independently supported from upstandi... | 05/06/1986 |
