Fluid Pressure Change Controls Drive Patents (Class 173/177)
  • Patent number: 10377023
    Abstract: A hydraulic torque impulse generator includes a drive cylinder with a hydraulic fluid chamber, an output shaft with an impulse receiving portion connected to a radially movable seal element and intermittently dividing the hydraulic fluid chamber into high and low pressure compartments, and cam profiles which can displace the seal element from an idling position to a high pressure pulse generating position. A by-pass passage communicates fluid between the high and low pressure compartments, and a valve element movable between closed and open positions controls the fluid flow. The valve element is closed during pressure build-up in the high pressure compartment and opens when a high pressure pulse is completed, and is part of a control spindle coupled to the drive cylinder. The control spindle rotates through an angular play by inherent kinetic energy at an abrupt stop of the drive cylinder at the generation of each high pressure pulse.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: August 13, 2019
    Inventor: Per Thomas Söderlund
  • Patent number: 10328564
    Abstract: Mechanisms for reducing power output of a power tool by restricting airflow into the motor of the tool. The power regulator can be implemented in only one of the rotational directions, for example, the forward (or clockwise) direction, and can be independent of the forward/reverse mechanism to avoid a user becoming confused as to the source of tactile feedback. By limiting air input to the motor, rather than bleeding out motor output, the mechanisms prevent wasted power output. Also, the power regulation mechanism can be located near the motor to more effectively restrict airflow.
    Type: Grant
    Filed: February 27, 2015
    Date of Patent: June 25, 2019
    Assignee: Snap-on Incorporated
    Inventors: Dennis A. Nowak, Jr., John R. Williams
  • Patent number: 9850716
    Abstract: A remote-controlled adjustable-speed screw drill for gas-drive hydraulic-motive during gas drilling is provided, including a piston speed control system, a motor assembly, a cardan shaft assembly and a transmission shaft assembly which are connected with each other from up to down in sequence. The motor assembly includes air inlets, a cam, air cylinders, pistons, a connecting rod, air outlets, liquid inlets, hydraulic cylinders, liquid check valves, a liquid storage chamber, liquid outlets, a liquid injecting chamber, a liquid injecting hole, an anti-drop cap, a rotor, a stator, and a motor assembly housing. The present invention utilizes the high-pressure gas injected by the gas drilling to drive the pistons to move back and forth at high-speed, so as to drive the incompressible liquid within the driving screw to achieve the self-circulating motion, and the screw rotor is driven to rotate by the liquid.
    Type: Grant
    Filed: May 3, 2016
    Date of Patent: December 26, 2017
    Assignee: Southwest Petroleum University
    Inventors: Tiejun Lin, Ying Zhang, Zhanghua Lian, Qiang Zhang, Yong He, Gao Li, Taihe Shi, Hao Yu
  • Patent number: 9845662
    Abstract: A downhole actuator typically for a downhole tool such as a valve, and typically for incorporation in a string of tubulars in an oil or gas well has a central axis with radially movable counterweights on opposite sides of the axis, which move radially outward to change the activation state of the actuator. The counterweights are supported by link arms which control the movement of the counterweights in response to centrifugal force created by rotation of the body, for example, during rotary drilling operations of the string. Radial outward movement of the counterweights typically transmits axial forces between sleeves at the upper and lower ends of the counterweights, so when the counterweights move radially outward, the upper and lower sleeves approach one another, which typically triggers the actuator.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: December 19, 2017
    Assignee: CFF Technologies Limited
    Inventors: Bruce Thornton Jepp, Keith Scott Gaskin, Rae Andrew Younger, Stuart Thomas Rothnie
  • Patent number: 9840407
    Abstract: A beverage dispensing system includes a plurality of beverage sources each containing a beverage component, and at least one flow valve connected to one or more of the beverage sources and operable to control a flow of the beverage component therefrom. The system further includes a graphical display that presents a plurality of available beverages and a gesture capture device that receives a selection gesture input to select a beverage from the plurality of available beverages. A controller is also included that adjusts the at least one flow valve based on the selection gesture input to dispense the selected beverage.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: December 12, 2017
    Assignee: Cornelius, Inc.
    Inventors: Vincenzo DiFatta, Jeffrey Joray, Christopher Knight
  • Patent number: 9643301
    Abstract: An impact device for power transmission includes an impact unit and a hydraulic pressure adjusting unit. The impact unit has a hydraulic cylinder which is installed with a piston assembly and an output shaft therein for outputting torque through the output shaft by utilizing a hydraulic pressure provided in the hydraulic cylinder. The hydraulic pressure adjusting unit is disposed in the hydraulic cylinder and operative to adjust the hydraulic pressure of the hydraulic cylinder. Therefore, the impact device for power transmission can generate a hydraulic torque pulse, and the magnitude of the output torque can be adjusted by the hydraulic pressure adjusting unit.
    Type: Grant
    Filed: July 22, 2014
    Date of Patent: May 9, 2017
    Assignee: Tranmax Machinery Co., Ltd.
    Inventor: Hsin-Chi Chen
  • Patent number: 9296094
    Abstract: A pneumatic driven wrench comprises: a housing defining a middle channel; a cylinder defining two fluid passages; a rotor; a first valve; a second valve driven by a valve-switching member for controlling fluid communication between the middle channel and a selected one of the fluid passages; a valve-triggering unit for driving the first valve; and a locking member driven by the valve-triggering unit to move between releasing and locking positions. The locking member engages one of the valve-switching member and the second valve when at the locking position. The locking member is disengaged from the one of the valve-switching member and the second valve when at the releasing position.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: March 29, 2016
    Assignee: Basso Industry Corp.
    Inventors: San-Yih Su, Cheng-Wei Lai
  • Patent number: 8972736
    Abstract: A method, system, and computer readable medium containing programming for handling fully authenticated transmission of video or other data (content) from a provider to a recipient device via an intermediary device. An inner envelope containing the content and/or security features is prepared and digitally signed using a private cryptographic key. The signed inner envelope is then included in a second, outer envelope which may also include some or all of the content. The outer envelope is also digitally signed, thereby forming a data package which may be sent from the provider to the intermediary device. If the signature of the outer envelope is authenticated at the intermediary device, then the inner envelope is sent to the recipient device which then uses the inner signature to verify its authenticity. Authenticated content may then be presented or otherwise used at the recipient device.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: March 3, 2015
    Assignee: General Motors LLC
    Inventors: Kenneth L. Peirce, Alfred C. Tom, Robert A. Hrabak
  • Patent number: 8939227
    Abstract: A pressure protection valve is provided which provides a fluid short circuit between a fluid pressure inlet of a hydraulic tool such as a hydraulic hammer and a low pressure region when the pressure at the fluid pressure inlet exceeds a first trigger pressure equal to a predetermined permissible pressure. This prevents damage to the hydraulic tool which can arise through operation at excessive fluid flow or pressure from hydraulic fluid supplied by a carrier vehicle. The pressure protection valve may maintain fluid communication between the fluid pressure inlet and the low pressure region until the pressure at the fluid pressure inlet reduces to a pressure below a predetermined second trigger pressure which is less than the first trigger pressure, to prevent further operation of the tool until the flow of fluid to the fluid pressure inlet has been stopped by an operator.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: January 27, 2015
    Assignee: Caterpillar Inc.
    Inventor: Francis Theobalds
  • Patent number: 8820432
    Abstract: A pneumatic impulse wrench for tightening screw joints includes a housing with a pressure air inlet passage, an exhaust air outlet passage, a rotation motor, a hydraulic impulse generator, and is connected to a stationary programmable control unit. The impulse wrench also includes a torque indicating mechanism connected to the control unit for feeding back electric signals responsive to the output torque of the wrench, an electromagnetically activated inlet valve arranged in the air inlet passage, and an electromagnetically activated exhaust valve which controls the exhaust air flow from the motor. The exhaust valve is a proportional valve activated by a linearly operated electromagnetic actuator and arranged to continuously adapt the exhaust air flow and, hence, the motor power to the characteristics of the actual screw joint being tightened in response to feed back signals from the torque indicating mechanism and in accordance with a programmed tightening strategy.
    Type: Grant
    Filed: May 8, 2009
    Date of Patent: September 2, 2014
    Assignee: Atlas Copco Industrial Technique Aktiebolag
    Inventor: Anders Urban Nelson
  • Patent number: 8813870
    Abstract: An arrangement in a rock drill rig 10 has an inlet valve 31 arranged upstream from a displacement compressor 32 that is used for supplying an air flow 34 to at least one flushing hole 23 in the surface of a drill bit 20. The rock drill rig 10 also has an air regulator 35 arranged to regulate the system pressure in the air flow path 34 downstream from the compressor and a detector for detecting air flow through the at least one flushing hole 23 in the surface of the drill bit. The detector has a pressure sensor 36, arranged between the air regulator 35 and the inlet valve 31, for measuring the reduced system pressure.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: August 26, 2014
    Assignees: Atlas Copco Rock Drills AB, Atlas Copco Drilling Solutions LLC
    Inventors: Deyi Jiao, Per Krainer
  • Patent number: 8544559
    Abstract: A portable power tool having a housing with a rotation motor for powering a working implement, wherein sensors are provided to indicate the motor speed and the power supply, and a programmable evaluation unit is arranged to compare indicated speed and pressure values with stored limit values, and to accumulate the total operation time of the power tool and compare that with preset time limits for tool service intervals, and an optical information unit is provided on the housing to indicate whether those stored limit values have been reached.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: October 1, 2013
    Assignee: Atlas Copco Industrial Technique Aktiebolag
    Inventors: John Robert Christian Friberg, Anders Urban Nelson
  • Publication number: 20130081839
    Abstract: A relief valve assembly limits the maximum torque of a gear motor of a hydraulically driven tool. The relief valve assembly dumps flow to a return channel to return hydraulic fluid to the supply when the relief valve assembly is activated. The relief valve assembly is placed in the channel of a directional valve spool, and varies its pressure setting depending upon spool position. This is useful to vary the pressure settings of a hydraulic motor in different directions.
    Type: Application
    Filed: September 27, 2012
    Publication date: April 4, 2013
    Applicant: Greenlee Textron, Inc.
    Inventor: Greenlee Textron, Inc.
  • Patent number: 8347980
    Abstract: A hydraulic aggregate comprises a container, a reservoir for hydraulic oil, and a pump driven by a motor arranged in the reservoir. The motor is a pneumatic motor. An electric control unit for controlling a main valve is mounted on the container. The main valve causes a reversal of the stroke direction of the hydraulic connections. The division into pneumatics and low power electronics leads to an explosion-proof embodiment of low weight and little technical complexity.
    Type: Grant
    Filed: January 25, 2008
    Date of Patent: January 8, 2013
    Assignee: Wagner Vermögensverwaltungs-GmbH & Co. KG
    Inventors: Paul-Heinz Wagner, Bernd Thelen, Ulf Sittig, Günter Andres
  • Publication number: 20120055690
    Abstract: [Problem] To present a impact torque adjusting device of a hydraulic torque wrench capable of enhancing the precision of the magnitude of the impact torque generated by the impact torque generating device of the hydraulic torque wrench, shortening the generation period of impact toques, and enhancing the durability of the impact torque generating device of the hydraulic torque wrench, when rotating in two directions, that is, in normal rotation (when tightening) and in reverse rotation (when loosening).
    Type: Application
    Filed: March 8, 2011
    Publication date: March 8, 2012
    Inventor: Yoji UEMURA
  • Patent number: 8066082
    Abstract: An air driver device having a simple construction, being of a compact size, and having excellent durability. The air driver device is designed to shut off a supply of compressed air to an air motor, by means of a tightening torque control mechanism and a shut-off valve mechanism, in a case where the tightening torque reaches the set torque value. The air device is designed to tighten screw members at a prescribed tightening force, wherein the tightening torque control mechanism is composed of (i) a clutch unit, (ii) a driving piston on the back face of which is formed one clutch plate, so that clutch plates of the clutch unit may move by making rotational differential motions in a case where the tightening torque reaches the set torque value, (iii) a cylinder for storing this driving piston, (iv) a check valve for operating the shut-off valve mechanism, in linkage with the driving piston through an oil charged in the cylinder, and (v) a torque control member for regulating the set torque value.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: November 29, 2011
    Assignee: Uryu Seisaku Ltd.
    Inventor: Koji Tatsuno
  • Patent number: 7982624
    Abstract: A system for preventing accidents in the operation of a monitored apparatus carried by a user has terminal in direct contact with the body of the user and provided with a circuit for continuously or periodically transmitting an authorizing user data signal through the body of the user. A signal receiver assigned on the monitored apparatus or machine has an interface in contact with the user for receiving the signal, a circuit for continuously or periodically testing the received data signal, another circuit for outputting a clearance signal that allows operation of the monitored machine or apparatus after a successful test of the received authorizing user data signal, and yet another circuit for terminating output of the clearance signal following a successful test of the authorizing user data signal when a subsequent test of the data signal fails.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: July 19, 2011
    Assignee: Ident Technology AG
    Inventors: Wolfgang Richter, Stefan Donat, Peter Rosenbeck
  • Patent number: 7978184
    Abstract: A method and system for providing an enhanced and interactive window shopping and retail information exchange with shoppers, includes acoustic sensing in connection with one or more storefront windows of a retail store, and a corresponding transparent display located within the store and visible through the storefront window, the interior of the store being visible through the transparent display. Display of information on the transparent display, and in optional combination with audio information external to the store, prompts shoppers to tap the storefront window at locations which correspond to the locations of information displayed on the transparent display. The system and method is programmed to respond to taps on the window according to the locations of the taps with incentives to enter the store and/or to redeem awards or coupons in the store.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: July 12, 2011
    Assignee: American Greetings corporation
    Inventor: James C. Morrison
  • Publication number: 20100276171
    Abstract: A pneumatic drive system (1) in which the movement of an output drive unit (7) of a pneumatic drive (2) is controlled by control valve means (25 and 26) which are connected with the working chambers (12 and 13) of the pneumatic drive (2). The control valve means (25 and 26) comprise at least one air economy setting (30) setting a choke cross section and a high power setting (29) defining a flow cross section larger than it. Actuating means (12 and 13) serve to ensure that the control valve means (25) are switched over, in a fashion dependent on the air pressure obtaining in the at least one working chamber (12 and 13) from the normally assumed air economy setting (30) into the high power setting (29), when the output drive unit (7) meets with an increased resistance to motion.
    Type: Application
    Filed: February 21, 2006
    Publication date: November 4, 2010
    Inventors: Ulrich Hirling, Ute Casimir
  • Patent number: 7779930
    Abstract: The invention relates to a striking device (5) comprising a striking mechanism (8) which is driven by a pressure medium. Said device comprises a percussion piston (13) which can be displaced back and forth by means of a control device and a control valve which is embodied as a pressure shut-off valve (19) or as a stop valve, said control valve automatically stopping the striking mechanism if it exceeds a predetermined maximum value based on the working pressure controlling the inlet line, blocking the pressure line (3) or maintaining the control device in one of the and positions thereof. The inventive striking device also comprises a hydraulic catcher buffer which is used to brake the percussion piston when it exceeds a predetermined impact plane. According to the invention, the control valve must remain deactivated at least as long as the percussion piston is displaced on the hydraulic catcher buffer.
    Type: Grant
    Filed: July 2, 2005
    Date of Patent: August 24, 2010
    Assignee: Atlas Copco Construction Tools GmbH
    Inventors: Stefan Lohmann, Karlheinz Fritz, Reiner Koch, Markus Mellwig, Hendrik Moller, Uwe Autschbach
  • Publication number: 20100170689
    Abstract: The hydraulic aggregate comprises, within a container (10), a reservoir (11) for hydraulic oil. A pump (15) driven by a motor (18) is arranged in the reservoir (11). The motor (18) is a pneumatic motor. An electric control unit (30) for controlling a main valve (23) is mounted on the container (10). The main valve causes a reversal of the stroke direction of the hydraulic connections (13,14). The division into pneumatics and low power electronics leads to an explosion-proof embodiment of low weight and little technical complexity.
    Type: Application
    Filed: January 25, 2008
    Publication date: July 8, 2010
    Inventors: Paul-Heinz Wagner, Bernd Thelen, Ulf Sittig, Günter Andres
  • Publication number: 20080296035
    Abstract: The invention relates to a striking device (5) comprising a striking mechanism (8) which is driven by a pressure medium. Said device comprises a percussion piston (13) which can be displaced back and forth by means of a control device and a control valve which is embodied as a pressure shut-off valve (19) or as a stop valve, said control valve automatically stopping the striking mechanism if it exceeds a predetermined maximum value based on the working pressure controlling the inlet line, blocking the pressure line (3) or maintaining the control device in one of the end positions thereof. The inventive striking device also comprises a hydraulic catcher buffer which is used to brake the percussion piston when it exceeds a predetermined impact plane. According to the invention, the control valve must remain deactivated at least as long as the percussion piston is displaced on the hydraulic catcher buffer.
    Type: Application
    Filed: July 2, 2005
    Publication date: December 4, 2008
    Inventors: Stefan Lohmann, Karlheinz Fritz, Reiner Kock, Markus Mellwig, Hendrik Moller, Uwe Autschbach
  • Publication number: 20080264662
    Abstract: A right-handed and reverse air channel button for a pneumatic tool includes a basic body, at least one operating member and two air intake passageways. The basic body is pivotally positioned in a positioning hole of the base of a pneumatic tool, the operating member is secured at one side of the basic body and the air intake passageways are bored in the annular wall of the basic body. When the operating member is turned to actuate the basic body to rotate for a preset angle, the air intake a passageways will respectively correspond to an air intake channel and two guide channels of the base, which communicate with the positioning hole. Thus, air can pass through the basic body and get into the base to drive the pneumatic tool to rotate clockwise or counterclockwise, able to control the air amount, easy in assembly and convenient in operation.
    Type: Application
    Filed: April 24, 2007
    Publication date: October 30, 2008
    Inventor: Jui-Sheng Chang
  • Patent number: 7222680
    Abstract: A pneumatic motor having a motor chamber having an inner surface with an eccentric longitudinal axis, a motive gas fluid inlet, and at least one end wall located transversely to the longitudinal axis with an exhaust aperture located therethrough. A rotor is rotatably disposed in the motor chamber on the eccentric longitudinal axis and having a plurality of radial slots, the rotor defining a first rotational position with respect to the longitudinal axis at which the distance between the rotor and the motor chamber is a minimum. A plurality of vanes is slidably carried within the plurality of radial slots and rotationally moving between the fluid inlet and the exhaust aperture during rotation of the rotor.
    Type: Grant
    Filed: December 1, 2004
    Date of Patent: May 29, 2007
    Assignee: Ingersoll-Rand Company
    Inventors: Patrick S. Livingston, Karl C. Austin
  • Patent number: 7040414
    Abstract: A pneumatic tool includes a housing, a driving mechanism, a rear cap, a direction controller, a speed controller, and an operating member. The housing is formed with a component chamber and an intake passageway. The driving mechanism includes an output shaft rotatable about a rotary axis. The rear cap defines a cap chamber in spatial communication with the component chamber, and has a connecting passageway that intercommunicates the cap chamber and the intake passageway. The direction controller and the speed controller are mounted in the cap chamber for rotation about the rotary axis. The operating member is coupled to the direction controller, is accessible externally of the rear cap and the housing, and is operable to drive rotation of the direction controller about the rotary axis, thereby controlling direction of rotation of the output shaft. The speed controller is operable to vary torque and speed of the output shaft.
    Type: Grant
    Filed: November 16, 2004
    Date of Patent: May 9, 2006
    Inventor: David Kuo
  • Patent number: 6725948
    Abstract: In a method of regulating the feed force of a drilling device having a hydrostatic bore hole motor at the end of a linkage provided with a rotary and a feed drive, the feed of the linkage is set as a function of the pressure of the drive fluid for the bore hole motor in such a way that the liquid pressure remains in a predefined range or else remains constant. If the bore hole motor is equipped with an eccentricity for directional boring, for example with an angled housing, then, in addition or else independently of the feed control, directional deviations normally resulting from the linkage torsion can be compensated for by the eccentricity or the linkage being set to a corrected path angle.
    Type: Grant
    Filed: October 2, 2002
    Date of Patent: April 27, 2004
    Assignee: Tracto-Technik GmbH
    Inventor: Elmar Koch
  • Patent number: 6581696
    Abstract: An impact tool having a control system for turning off a motor at a preselected torque level.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: June 24, 2003
    Assignee: Chicago Pneumatic Tool Company
    Inventor: David A. Giardino
  • Patent number: 6466927
    Abstract: A procedure and method for eliciting expert information on process capability and thereafter manipulating the elicited information in such a manner that it can effectively be used in a process capability database that is operating in a six sigma regime. The manipulation preferably includes converting the expert elicited information from a tolerance-type metric to a short term standard deviation (or sigma) metric, whereby the result of the manipulation is used to populate directly a process capability database and, as appropriate, thereby augment, replace or modulate the data already stored therein.
    Type: Grant
    Filed: November 10, 1999
    Date of Patent: October 15, 2002
    Assignee: General Electric Company
    Inventors: John J. Dougherty, Thomas R. Campbell, Alan L. Arvidson
  • Patent number: 6334494
    Abstract: A pressure leading path in a impact type tool is branched halfway through a bypass passage for connecting a high pressure chamber H with a low pressure chamber (L). The branch includes a first fixed aperture leading to the high pressure chamber (H). The branch also includes a second fixed aperture leading to the low pressure chamber (H). The pressure leading path is connected to a primary side of a relief valve. An automatic shutoff mechanism is operated by hydraulic operating fluid relieved from the secondary side of relief valve. The automatic shutoff mechanism cuts off the air supply to the air motor driving the tool, and thus automatically shuts off the tool, when the pressure in the pressure leading path exceeds a predetermined value. The present invention permits control of pulsed torque with high precision in a simple construction.
    Type: Grant
    Filed: June 15, 2000
    Date of Patent: January 1, 2002
    Assignee: Fuji Air Tools Co., Ltd.
    Inventor: Atsushi Nagato
  • Patent number: 6311786
    Abstract: A process to more accurately determine torque output of power impact tools using impulse. Also disclosed are processes for controlling power impact tools, in particular a mechanical impact wrench, by determining the impulse of the tool impacts and deriving torque values therefrom. A mechanical impact wrench having an electronic control is also disclosed.
    Type: Grant
    Filed: December 3, 1998
    Date of Patent: November 6, 2001
    Assignee: Chicago Pneumatic Tool Company
    Inventors: David A. Giardino, Stephen M. DeMarco
  • Publication number: 20010010267
    Abstract: A torque control type impact wrench includes a first storage section for storing an ideal upper limit of the pulsed torque for screwing a male screw into a female screw, as a first storage value, a second storage section for storing a driving speed at which a driving section drives a torque producing section as a second storage value, and a control section for causing the driving section to drive the torque producing section at the second storage value and stopping the driving section when the pulsed torque exceeds the first storage value, wherein the control section causes the second storage section to store a value, which is larger than the second storage value, as a new second storage value when the pulsed torque does not reach the first storage value within a given time period after the driving section starts.
    Type: Application
    Filed: January 25, 2001
    Publication date: August 2, 2001
    Applicant: Nitto Kohki Co. , Ltd.
    Inventor: Masaki Kawarai
  • Patent number: 6179063
    Abstract: The present invention relates to an impulse wrench for use in conjunction with a fastener engaging tool and a power supply to selectively rotate threaded fasteners. The wrench comprises a housing and an impulse manifold rotatably mounted within the housing. An impulse piston is mounted inside a impulse piston receiving space for reciprocating movement and has an impulse delivering surface and a pressurizing surface. The piston and the piston receiving space are constructed and arranged such that the pressurizing surface and an outer end portion of the piston receiving space cooperate to define at least a portion of a high pressure chamber which is filled with a substantially incompressible fluid.
    Type: Grant
    Filed: May 3, 2000
    Date of Patent: January 30, 2001
    Assignee: The Stanley Works
    Inventors: John A. Borries, Kenneth F. Taucher
  • Patent number: 6164393
    Abstract: A hydraulic impact tool for use in a well, such as an oil or gas well, comprising a movable hammer which is arranged to prestress a spring by means of a hydraulic piston (16) provided with a through channel (20), and in which a movable sealing body (22, 45) is arranged to enable closing of the channel (43), so that hydraulic force from fluid under pressure applied to the impact tool, may displace the piston (16) and the hammer and prestress the spring, and in which the sealing body (22) is arranged to follow the piston (16) into an end position for so to open the channel (20) for throughput, so that the hydraulic force acting on the piston (16, 41) ceases, and the prestressed spring is released and drives the hammer to strike, at the same time as the piston (16, 41) returns to initial piston, whereafter the process is repeated. The sealing body (22) is arranged to close said channel (20) when the sealing body is subjected to a predetemined frictional force from fluid flowing through the impact tool.
    Type: Grant
    Filed: April 30, 1999
    Date of Patent: December 26, 2000
    Assignee: Bakke Technology AS
    Inventor: Stig Bakke
  • Patent number: 6019180
    Abstract: A procedure is described for determining the power output of a downhole drilling motor, when the motor is inside the wellbore. The technique uses stand-pipe pressure and fluid flow rate as the main inputs. The power output of the motor is calculated by carrying out two low flow stall tests at flow rates lower than the drilling flow rate. These tests result in "off-bottom" and stall pressures at the two flow rates. Another off-bottom pressure is taken at the actual flow rate that will be used during drilling operations. From the use of the off-bottom and stall pressure measurements, a determination is made of the differential pressure across the motor and the stall pressure at the actual drilling fluid flow rate. A full power curve and a predicted operating stand-pipe pressure for optimal power generation are provided based on an experimentally verified assumption regarding the change in rotation rate of the motor versus the differential pressure across the motor power section.
    Type: Grant
    Filed: April 29, 1998
    Date of Patent: February 1, 2000
    Assignee: Schlumberger Technology Corporation
    Inventors: Demosthenis Pafitis, Vernon Koval
  • Patent number: 5934385
    Abstract: A threading attachment for internal or external threading includes a spindle head (1) which is intended to be attached to a spindle on a machine tool and also a tap holder (5) with a holder body (6) in which a tap (13) is arranged during the threading work, the spindle head (1) and the tap holder (5) being extended along a joint axle. The tap holder (5) and the holder body (6) respectively have in threading position a power transmitting connection to the spindle head (1) via driving members (15, 16 and 28, 29, respectively) and have in back out position freely rotatable in relation to the spindle head (1) and arranged to be effected by a compressed medium via a driving member (18). The driving member can be a reaction turbine or an action turbine.
    Type: Grant
    Filed: December 17, 1997
    Date of Patent: August 10, 1999
    Assignee: Svenska Precisionsverktyg AB
    Inventor: Gustav Svensson
  • Patent number: 5913371
    Abstract: In a preferably hydraulic control for a preferably hydraulically-driven earth boring mechanism, whereby a boring rod equipped with a boring tool is fed into and out of the earth with simultaneous rotation, the feed speed of the rod is regulated automatically in dependence on the rotational movement applied to the boring rod and/or on the feed force applied to the boring rod to optimize the speed of the boring process and to prevent overload damage to the boring rod, boring tool and other parts of the boring mechanism.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: June 22, 1999
    Assignee: Terra AG fuer Tiefbautechnik
    Inventor: Dietmar Jenne
  • Patent number: 5626198
    Abstract: A pneumatically powered torque impulse delivering tool for screw joint tightening comprises a housing (10) with a forward impulse chamber (11) enclosing a hydraulic impulse generator (15), a motor chamber (12) disposed rearwardly of the impulse chamber (11) and including a vane type air motor (19), and air inlet and outlet passages (26, 27) located at the rear end of the housing (10). The motor cylinder (20) is provided with radial air communication openings (37a,b, 38a,b, 39a,b) and outer grooves (37c,d, 38c,d, 39c,d) forming passages for connecting the openings (37a,b, 38a,b, 39a,b) to the air inlet and outlet passages (26, 27).
    Type: Grant
    Filed: April 22, 1996
    Date of Patent: May 6, 1997
    Assignee: Atlas Copco Tools
    Inventor: Lars M. Peterson
  • Patent number: 5492185
    Abstract: An impulse wrench comprises a pneumatic rotation motor (12), a hydraulic torque impulse generator (13) provided with an impulse magnitude responsive actuator (17), a linear movement responsive electric signal producing device (25) located at the rear end of the motor (12), a movement transferring push rod (21) extending through an axial bore (22) in the motor rotor (16) and interconnecting the actuator (17) and the signal producing device (25), an electrically activated motive air shut-off valve (31) disposed concentrically with the signal producing device (25), and an external process controlling and monitoring unit (40) connected to the signal producing device (25) and the shut-off valve (31) and arranged to compute and compare received signals with predetermined values and to initiate shut-off of the power supply (31) as a desired tightening condition is reached.
    Type: Grant
    Filed: April 15, 1994
    Date of Patent: February 20, 1996
    Assignee: Atlas Copco Tools AB
    Inventors: Knut C. Schoeps, Ingemar J. F. Sjors
  • Patent number: 5439063
    Abstract: A compressed-air screw or bolt tightener having a driving motor which drives a driving shaft for a screwing or tightening tool is disclosed. The motor is operated by compressed air and a control valve for switching the compressed-air supply to the screw or bolt tightener on or off. A pressure-regulating valve is used to regulate the kinetic energy of the screw or bolt tightener.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: August 8, 1995
    Assignee: Cooper Industries, Inc.
    Inventors: Heinz G. Anders, Konrad K. Kettner
  • Patent number: 5421240
    Abstract: This invention is intended to effect torque control of high accuracy by detecting the oil pressure at the time of the generation of a pulse which forms the basis of the generated torque for a torque wrench and using the data thus obtained the effect torque control. Oil pressure pulses generated in a pulse generating mechanism 3 by the rotation of an air motor 1 are transmitted to a hydraulic cylinder 4 by a piston 33, a rod 36 and a piston 35. In addition, a pressure sensor 5 installed in the hydraulic cylinder 34 detects the oil pressure pulses and its signal is used to switch a switching valve 7, whereupon a stopping switching valve 9 and a stopping differential pressure valve 8 are successively switched, stopping the feeding of air to the air motor 1 while cutting of the passage of electric current from a battery 61 to an electric control circuit 6.
    Type: Grant
    Filed: August 6, 1993
    Date of Patent: June 6, 1995
    Assignee: Fuji Kuuki Kabushiki Kaisha
    Inventors: Masaji Ohta, Toshikazu Kitamura
  • Patent number: 5346021
    Abstract: An air tool for setting fasteners includes a pressure selecting valve member and internal passages for air balancing this valve member with a pressure relief pilot valve for bleeding a chamber of the valve member to atmosphere responsive to increased motor operating pressure. A plurality of such pilot valves may be provided in a manually rotatable selector disc. Each pilot valve may be set to a different torque output for quick and easy tool adjustment upon registering a given pilot valve with the pressure selecting valve chamber upon manipulation of the selector disc.
    Type: Grant
    Filed: May 10, 1993
    Date of Patent: September 13, 1994
    Assignee: The Stanley Works
    Inventor: Mark F. Braunlich
  • Patent number: 5217079
    Abstract: A hydro-impulse screwing device comprises a rotary drive motor, a power source for the motor, a drive shaft, a pulsating hydraulic drive connecting the motor to the shaft and a power cut-off for the motor. The load at which the power cut-off functions is adjustable. The tool has a borehole extending through the length of the shaft, a conduit for conducting hydraulic fluid from the drive to the borehole, a valve in the borehole movable from a closed position to an open position in response to hydraulic pressure corresponding to a predetermined load to allow hydraulic pressure from the drive to actuate the power cut-off, a biassing element in the borehole for biassing the valve toward a closed position against the hydraulic pressure, wherein the force of the biassing element is adjusted at the end of the drive shaft to change the load at which the power cut-off operates.
    Type: Grant
    Filed: September 6, 1991
    Date of Patent: June 8, 1993
    Assignee: Cooper Industries, Inc.
    Inventors: Konrad K. Kettner, Heinz-Gerhard Anders, Eugen Mattheiss
  • Patent number: 5117919
    Abstract: An air tool torque control system includes a controller operative to independently control two air tools with continuous programmed adjustment of the torque shut off point for each tool after each fastener joint is made. The torque specification is measured for each fastener joint made, is verified as being within an acceptable torque range, is compared to the set point of that torque specification range to determine the variation therebetween, and is then adjusted toward the mid point by the applicable correction factor for the variation determined to continuously compensate for variations in joint rate, line pressure and/or tool output. To enhance the effectiveness of the system, fast acting solenoid valves utilizing line pressure to assist in valve closure may be included to improve shut off control.
    Type: Grant
    Filed: September 11, 1989
    Date of Patent: June 2, 1992
    Assignee: The Rotor Tool Company
    Inventors: John A. Borries, Dennis A. Jarc
  • Patent number: 5113949
    Abstract: Disclosed is a tightening control apparatus for a torque wrench including a pressure detecting device for detecting an admission pressure supplied to a torque wrench. A pressure change detecting device determines a change in pressure detected by the pressure detecting device. A striking signal output device outputs a striking signal when the change reaches a reference value.
    Type: Grant
    Filed: July 31, 1989
    Date of Patent: May 19, 1992
    Assignee: Fuji Kuuki Kabushiki Kaisha
    Inventors: Masaaki Ohkubo, Ryo Fukada