With Randomly-actuated Stopping Patents (Class 72/1)
  • Patent number: 10330258
    Abstract: A power tool (200) includes a moving implement (222) and an ultrasonic transducer (226) that emits ultrasonic signals and receives echo return signals from an object (224, 229) that reflects the ultrasonic signals. A controller (240) identifies a distance between the implement and the object and identifies a type of the object based on the echo return signals from the object. The controller activates an implement arrest mechanism (236) in response to the distance between the object and the ultrasonic transducer being less than a predetermined threshold and the type of the object corresponding to a portion of a human body.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: June 25, 2019
    Assignees: Robert Bosch Tool Corporation, Robert Bosch GmbH
    Inventors: Bharadwaja Maharshi Ramaswamy, Vishwanatha Manevarthe Srikantiah, Niranjan Sathyanarayanarao Krishnarao
  • Patent number: 10326235
    Abstract: An apparatus for electrically connecting electronic devices includes a first connector including an electromagnet. The apparatus also includes a second connector that includes a magnetic element and is detachably coupleable to the first connector. The electromagnet is energizeable to selectively couple and decouple the first and second connectors. The apparatus further includes a force transducer coupleable to the electromagnet to measure a coupling force between the first and second connector and transmit a signal based on the coupling force, and a controller coupleable to the force transducer to receive the signal from the force transducer. The controller is coupleable to a power source to control the electromagnet.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: June 18, 2019
    Assignee: Facebook Technologies, LLC
    Inventor: Matthew James Devoe
  • Patent number: 9993885
    Abstract: A motorized manually operated pressing tool, in particular a crimping tool, with a fixed holding part, in which at least one pressing jaw is pivotably mounted about a pivot axis. The pressing jaw forms a working area and an impingement region extending in the longitudinal direction of the pressing jaw. In order to carry out a pressing operation the impingement region can be acted upon with an impinging part that is movable relative to the impingement region. The impinging part is movable in the longitudinal direction of the impingement region by exertion of manual force and by a motor.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: June 12, 2018
    Inventor: Egbert Frenken
  • Patent number: 9821359
    Abstract: A system and method for hydraulic forming of sheets is provided. A coil is connected to a pulse generator storing electric energy and discharging the electric energy to the coil, creating a first electromagnetic field in the coil. A conductive plate placed on the coil such that the first electromagnetic field causes creating of a second electromagnetic field in the conductive plate, in a direction opposite to the first electromagnetic field, creating a force. A pressure chamber filled with a fluid and placed on the conductive plate. A piston placed inside the pressure chamber to transfer the force to the fluid. A sheet placed on the pressure chamber, the fluid being configured to receive the force from the piston and transfer the force to the sheet. A die placed on the sheet, wherein the force transferred to the sheet from the fluid causes the sheet to take a shape of the die.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: November 21, 2017
    Inventors: Rasoul Jelokhani Niaraki, Mehdi Soltanpour, Ali Fazli
  • Patent number: 9782816
    Abstract: There is provided a die cushion device that includes a cushion pad, a hydraulic cylinder configured to lift the cushion pad, and a hydraulic closed circuit connected to a die cushion pressure creation chamber of the hydraulic cylinder. The hydraulic closed circuit includes a pilot drive type logic valve that is operable as a main relief valve at the time of the die cushion operation, and a pilot relief valve configured to create pilot pressure for controlling the logic valve. Hydraulic oil is filled in the hydraulic closed circuit, in a pressurized manner, and the hydraulic oil in the hydraulic closed circuit is pressurized by only die cushion force applied from the cushion pad through the hydraulic cylinder, in one cycle period of the cushion pad.
    Type: Grant
    Filed: May 5, 2015
    Date of Patent: October 10, 2017
    Inventors: Yasuyuki Kohno, Tadahiro Kondo
  • Patent number: 9421678
    Abstract: A forming device comprising a machine bed, a tool carrier supported on the machine bed in a manner capable of relative movement for mounting a tool, a drive device coupled to the tool carrier, a machine control unit and a monitoring device designed for monitoring movements of the tool carrier and for providing a shutdown signal to a disconnecting device located upstream of the drive device on the occurrence of a pre-settable monitoring case. It is provided that the machine control unit is designed in accordance with a first safety category of a safety standard, and that the monitoring device and the disconnecting device form a safe operating system designed in accordance with a second safety category of the safety standard, the second safety category being at a higher level than the first safety category within the safety standard.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: August 23, 2016
    Inventor: Lutz Fiessler
  • Patent number: 7685860
    Abstract: A control device for a press machine, by which one of the slide and the die cushion is suitably controlled, when a malfunction occurs in the other, such that the force between the slide and the die cushion does not excessively increase. The control device includes a slide control part for controlling the motion of the slide and a die cushion control part for controlling the motion of the die cushion. A first transmitter transmits an abnormal signal from the die cushion control part to the slide control part when a first detector detects a malfunction of the die cushion. The slide control part is configured to move the slide, when receiving the abnormal signal, such that the slide is away from the position of the die cushion at the time of receiving the abnormal signal by a certain distance and, to stop the slide.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: March 30, 2010
    Assignee: Fanuc Ltd
    Inventors: Yasusuke Iwashita, Tadashi Okita, Hiroyuki Kawamura, Satoshi Ikai
  • Patent number: 7448241
    Abstract: A safety system for use with a machine having a moving tool arranged to move through a known path of movement. The safety system is arranged to detect the presence of an obstruction in a region (20) around a portion of said path deemed to be hazardous. The safety system is characterised by comprising a light emitting means (16), a light receiving means (18) and a processing and control means. The light emitting means (16) is arranged to emit light generally parallel to the path of movement of the tool such that the region (20) is illuminated. The light receiving means (18) is arranged to receive light from the light emitting means (16) which has passed through the region (20).
    Type: Grant
    Filed: June 10, 2003
    Date of Patent: November 11, 2008
    Inventor: Kevin S. Davies
  • Patent number: 7383711
    Abstract: Embodiments of a leveler that may be controlled by a computer are provided. The leveler may include a top frame that has at least a first set of rolls mounted thereon. The top frame includes a plurality of operatively associated ball screw assemblies that enable movement of the top frame with respect to a bottom frame of the leveler. The bottom frame has at least a second set of rolls mounted thereon. The leveler may further include at least one motor operatively associated with the plurality of ball screw assemblies. The motor is designed to drive the plurality of ball screw assemblies to move the top frame. The motor may also have at least one operatively associated encoder configured for monitoring or communicating data associated with rotation of the ball screw assemblies. The leveler may also include at least one position transmitter configured for monitoring a position of at least a portion of the top frame relative to a position of at least a portion of the bottom frame.
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: June 10, 2008
    Assignee: Blue IP, Inc.
    Inventor: James N. McKenna
  • Patent number: 6792787
    Abstract: A workpiece transfer assembly (12, 112) moves workpieces through a press (10) and includes a pair of spaced pulleys (42) and an endless belt (43) entrained about the pulleys (42) and a clamp (46) connecting the belt (43) to a trolley (34, 134) for horizontally moving a pair of trolleys (34, 134) and the arms (24, 124) supported thereby. The clamp (46) is clamped to one reach of the endless belt (43) for moving back and forth along the between the pulleys (42). A biasing device (56) urges a male cam member (52) into driving engagement with a female cam member (54) to connect the belt (43) and the arms (24, 124) and allows the cam members (52 and 54) to react with one another in a camming fashion to move out of the driving engagement to allow the belt (43) to move without moving the arms (24, 124) in response to the predetermined force resisting movement of the arms (24, 124).
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: September 21, 2004
    Assignee: HMS Products, Co.
    Inventor: Glen Coalson
  • Patent number: 6742375
    Abstract: A system for the transport of workpieces in a forming press, particularly a multistation press, has at least one cross traverse for holding the workpieces, which on at least one of its ends is connected with a lifting and lowering device and can be oriented in a space by the lifting and lowering device. At least one overload protection device is arranged between the cross traverse and the at least one lifting and lowering device for cutting the connection between the cross traverse and the at least one lifting and lowering device.
    Type: Grant
    Filed: September 4, 2002
    Date of Patent: June 1, 2004
    Assignee: Schuler Pressen GmbH & Co. KG.
    Inventors: Karl Thudium, Andreas Dangelmayr
  • Patent number: 6737765
    Abstract: A punch and press system includes a low voltage safety circuit and a high voltage control circuit. The high voltage control circuit is further divided into a high voltage low current region and a high voltage high current region. The high voltage low current region is isolated from both the low voltage safety circuit and the high voltage high current region of the control circuit. As the upper tool of the press strikes an object, the object's conductivity will govern whether the press will continue to act on the object. Thus, if the object is conductive, then the upper tool will continue to act on the object. If the object is not conductive, then the upper tool will raise to a neutral position.
    Type: Grant
    Filed: August 13, 2001
    Date of Patent: May 18, 2004
    Inventor: Thomas Gharst
  • Publication number: 20040083785
    Abstract: A tool for flanging coated brake pipes has a basic body with a receiving groove and a clamping jaw with a clamping groove. The receiving groove and the clamping groove form a clamping channel, in which the brake pipe can be received snugly. To achieve the snug hold of the brake pipe without unacceptable deformations as well as the coaxial alignment of this brake pipe in relation to a pressure piece of the basic body, by which the flanged head is formed, different surfaces of the receiving groove and of the clamping groove are provided. Thus, the surfaces may be provided with a surface roughness with an arithmetic average peak-to-valley height Ra of 5.0 to 10.0.
    Type: Application
    Filed: September 15, 2003
    Publication date: May 6, 2004
    Inventor: Horst Klann
  • Publication number: 20040020255
    Abstract: The invention describes a safety device (45), in particular a beam-emitting and beam-receiving system for a production machine (1), e.g. an edging press, with a retaining mechanism (51) for the safety device (45) on a press beam (16) to which bending and/or pressing tools can be attached. The retaining mechanism (51) has at least one retaining means (52) designed to be received in a tool holder device (35). A detection system (66) wired to the machine control system of the production machine (1) is provided between the tool holding device (35) and the retaining means (52).
    Type: Application
    Filed: August 2, 2002
    Publication date: February 5, 2004
    Applicant: Trumpf Maschinen Austria GmbH & Co. KG.
    Inventors: Friedrich Kilian, Gerhard Sperrer
  • Publication number: 20030066323
    Abstract: An overload protection control method for a pressing machine capable of performing overload protection with excellent responsiveness with a simple structure is provided. For this purpose, the overload protection control method includes the steps of driving a slide (4) to reciprocate via a mechanical power transmission mechanism (3) by a servo motor (21), and raising the slide (4) by the servo motor (21) when detecting overload on the slide (4) during pressurization.
    Type: Application
    Filed: September 23, 2002
    Publication date: April 10, 2003
    Applicant: KOMATSU LTD.
    Inventor: Kenichi Teraoka
  • Patent number: 6389860
    Abstract: A press brake machine has a movable ram, a fixed bed, a drive for moving the ram toward and away from the bed, and a control system which controls movement of the ram. The control system includes an emitter which emits a beam of light and a detector assembly which detects an interruption of the light beam. The detector assembly includes two sensors and a beam splitter at which the light is directed. The sensors are connected in series such that if either or both of the sensors detect that the light beam is interrupted, a signal is sent to the drive to open the ram. The press is provided with a reset switch which is closed when the ram is moved to an open position. The reset switch is connected and operable such that the press brake cannot be reset if the light beam is interrupted.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: May 21, 2002
    Assignee: Lion Machinery, Inc.
    Inventor: Leo Stalzer
  • Patent number: 6145366
    Abstract: Damage to the dies due to a die collision caused by an input error of bending data etc. is avoided without use of a specialized device for pressure detection. A die interference checking mode is provided for setting the pressure of the ram, which supports the movable die, to a value that does not cause damage in the event that the movable die and the fixed die interfere with each other and for driving the ram so as to create the set pressure. A die interference determining step is further provided in which it is determined whether the movable die and the fixed die have interfered with each other in the die interference checking step, and if it is determined that the dies have interfered, the movement of the ram is stopped, and if it is determined that the dies have not interfered, the die interference checking step is cancelled and the operation of the press brake proceeds to an ordinary bending step.
    Type: Grant
    Filed: May 24, 1999
    Date of Patent: November 14, 2000
    Assignees: Komatsu Ltd., Komatsu Industries Corporation
    Inventor: Yukihiro Yamada
  • Patent number: 6131429
    Abstract: A safety device for use on a press brake for forming a part between a die mounted on a lower frame of the press brake and a punch mounted on a moveable ram of the press brake. The safety device includes a gate pivotably mounted to the ram and a sensor mounted to the gate. The gate is pivotable between a guarded position and a retracted position, wherein the gate is in the guarded position when the punch is more than a preselected distance from the die, and wherein the gate is in the retracted position when the punch is less than the preselected distance from the die. The sensor is electrically connected to the press brake to suspend operation of the press brake upon actuation of the sensor when the gate is in the guarded position.
    Type: Grant
    Filed: February 11, 1999
    Date of Patent: October 17, 2000
    Inventor: James C. Ward
  • Patent number: 6053099
    Abstract: A system for use in a press machine includes a drive assembly in the form of a pinion gear that selectively engages the flywheel to enable operative driving rotation of the pinion gear by the flywheel. A load system in the form of a hydraulic pump is arranged in operative driving relationship with the pinion gear. Accordingly, rotational energy withdrawn from the flywheel becomes available for use in driving the hydraulic pump, which is preferably arranged in fluid communication with the press machine to supply a flow of oil for lubrication purposes. An adjustment assembly is arranged to controllably reversibly displace the pinion gear to effect its selective engagement with the flywheel. The pinion gear is provided with a geared peripheral surface for intermeshing engagement with the flywheel at a geared periphery thereof. The system may also be operated in reverse to drive the flywheel.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: April 25, 2000
    Assignee: The Minster Machine Company
    Inventor: Steven M. Gruber
  • Patent number: 5970763
    Abstract: If a fault occurs in a servo driving system incorporated in a transfer system, the transfer system is continuously driven or safely stopped without loosing synchronization of the transfer system with a pass system. The transfer system is driven by a plurality of independently controllable servo motors 12.sub.1 to 12.sub.n. In the event that a driver for any one of the servo motors is failed for example, transmission of driving force to the servo motor associated the failed driver is interrupted by a magnet conductor in response to a specified signal indicative of a driver failure so that the servo motor can be brought into a free state.
    Type: Grant
    Filed: April 29, 1998
    Date of Patent: October 26, 1999
    Assignee: Komatsu Ltd.
    Inventor: Yukiyoshi Takayama
  • Patent number: 5934125
    Abstract: There is provided a refuging system for transfer bars of a transfer feeder of a transfer press, in which the transfer bars are driven by a transfer bar driving mechanism including an induction type servo motor. The refuging system includes a servo control for controlling the induction type servo motor, a detector for detecting an occurrence of an abnormal condition of the servo control and urgently stopping operations of a slide of a press body of the transfer press and the induction type servo motor, a detector for detecting a crank angle of the press body and discriminating an area in which the slide or a mold of the press body interfere with the transfer bar of the transfer feeder or an attachment therefor attached to the transfer bar, and a driver for driving the transfer bar to a position at which the slide and the mold of the press body do not interfere with the transfer bar of the transfer feeder and the attachment by applying an A.C.
    Type: Grant
    Filed: June 15, 1995
    Date of Patent: August 10, 1999
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventor: Yukiyoshi Takayama
  • Patent number: 5913932
    Abstract: Synchronous driving of a press system and a transfer system at the time of failure is achieved by employing an extremely inexpensive arrangement. A capacitor is provided in an electric supply line for servo motors incorporated in the transfer system, for supplying energy to the servo motors in the event of power failure. There are provided a power failure sensor for sensing power failure and an uninterruptible power supply unit for supplying energy to a control system (a transfer system controller, relay logic and others) for controlling the servo motors, when the power failure sensor senses power failure.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: June 22, 1999
    Assignee: Komatsu Ltd.
    Inventor: Yukiyoshi Takayama
  • Patent number: 5553478
    Abstract: A crimping tool for crimping electrical connectors. The tool has a compression head, a hydraulic pump, an electric motor, a removable rechargeable battery, and a control system. The control system has a printed circuit board that monitors voltage of the battery, a trigger, and a hydraulic system pressure sensor. The tool is prevented from starting a crimp operation if the circuitry on the printed circuit board senses a predetermined inadequate low voltage level of the battery that could otherwise prevent a good crimp from being obtained. After a good crimp is obtained, the circuitry disables operation of the motor for a predetermined amount of time.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: September 10, 1996
    Assignee: Burndy Corporation
    Inventor: Gary W. Di Troia
  • Patent number: 5471856
    Abstract: A bending processing apparatus includes upper and lower molds made of a flexible synthetic resin material which are interposed between end surfaces of a plurality of driven cylinders opposing a corresponding plurality of movable cylinders. This arrangement is mounted on a base stand and an article to be subjected to bending processing is supported by pressure between the upper and lower molds. A control unit is provided for controlling a stroke amount, stroke order and speed of the respective cylinders such that pressing force may be uniformly obtained during bending processing, thus wrinkling or finding in the article during processing is prevented.
    Type: Grant
    Filed: January 28, 1994
    Date of Patent: December 5, 1995
    Assignee: Kinugawa Rubber Ind. Co., Ltd.
    Inventors: Masatoshi Suzuki, Hajime Kuga
  • Patent number: 5272896
    Abstract: A forging method for making a forged product from an elongate steel bar material. The forging comprises a heating step in which the elongate bar material is heated, a cutting step in which the heated bar material is cut into billet materials each having a predetermined length, and a forging step in which the billet materials are successively forged. In this forging method, when an abnormality arises in the forging step, the cutting in the cutting step is interrupted and the bar material in the heating step is maintained in the heating step without being transferred toward the cutting step. Additionally, unless the abnormality is normalized within a predetermined limit time, the cutting in the cutting step is restarted and the billet materials formed after the restarting of the cutting are transferred to a storing apparatus which is outside of a normal forging line.
    Type: Grant
    Filed: July 15, 1992
    Date of Patent: December 28, 1993
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Koichi Mine
  • Patent number: 5271318
    Abstract: A movable table 1 which rests on a mechanism with two upper parts 3 and two lower parts 4, situated on a fixed counter table 2 under which there is an electromagnet 6, which attracts a counter-weight 5 joined by way of bars 7 to a central ball-and-socket joint of an articulated safety mechanism in such a way that when the electromagnet 6 is disconnected the counter-weight 5 falls, the mechanism folds and the table 1 descends. Under the table 1 and the counter-weight 5, there exist some cylinders and stops 3, 11 which damp and limit the table's descent. The safety mechanism is housed in slots situated under the table 1 and on top of the counter table 2 and its central ball-and-socket joint is formed by the insertion of the lower shaft of the upper part of the mechanism in an upper half tube of the lower piece of the same mechanism.
    Type: Grant
    Filed: August 13, 1992
    Date of Patent: December 21, 1993
    Inventor: Manuel A. Lledos
  • Patent number: 4936126
    Abstract: A press brake with a displacement sensor of an electric signal output has a base distance portion; a displacement sensor disposed opposite the base distance portion and having an electric signal output; a pair of dies one of the molds being provided with either the base distance portion or the displacement sensor, the other being provided with the remaining one of the base distance portion or the displacement sensor through a linear actuator; a servo amplifier for inputting an electric signal output coming from the displacement sensor; a servo valve controlled by an output signal coming from the servo amplifier; and a cylinder controlled by the servo valve and adapted to actuate either one of the pair of dies.
    Type: Grant
    Filed: May 17, 1988
    Date of Patent: June 26, 1990
    Assignee: Daiichi Electric Co., Ltd.
    Inventor: Hiroshi Sato
  • Patent number: 4907432
    Abstract: A safety device comprises a laser beam (7) emitted by an emitter located at one side of a press and received by a receiver located at the other side of the press. The beam is directed in parallel with the edge (5) of the punch of the press (1) at a distance from the surface (4) of the metal sheet lying between the thickness of a finger and the stopping distance of the punch at low speed. A device disposed in the diameter of the beam enables actual measurement of the speed of motion of the punch or of any body being carried along by the punch, so as to order interruption of the motion of the punch when the measured speed is higher than a predetermined speed.
    Type: Grant
    Filed: April 21, 1989
    Date of Patent: March 13, 1990
    Assignee: Cybelec S.A.
    Inventor: Jean-Claude Maillefer
  • Patent number: 4870845
    Abstract: A working apparatus for working a crankshaft having a journal portion and a crank pin includes first and second follow-up mechanisms. The first follow-up mechanism has first and second support members for rotatably clamping the journal portions therebetween. The second support member is moved in relation to the first support member by a first actuator. The second follow-up mechanism has third and fourth support members for rotatably clamping the crank pin therebetween. The fourth support member is moved in relation to the third support member by a second actuator. A first fillet roller is provided at the first support member and pressed against the journal portion, to roll thereon, and a second fillet roller is provided at the third support member and pressed against the crank pin, to roll thereon.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: October 3, 1989
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventor: Kiyoshi Nakagawa
  • Patent number: 4723429
    Abstract: A novel press load monitoring system for a variable speed press which is capable of automatically adjusting the measured load level of the press so as to compensate for strain in the press frame produced by mechanical vibrations occurring as the speed of the press is varied.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: February 9, 1988
    Assignee: Data Instruments, Inc.
    Inventors: Daniel R. Weber, Andrew D. Baker
  • Patent number: 4651601
    Abstract: A device for preventing a collision between a work holder (20) and a tool in numerical control equipment for a turret punch press. A region occupied by the work holder (20) in a mechanical coordinate system, is stored in a work holder region storing memory (4), and the sizes of a plurality of tool posts of a turret (24), or the sizes of tools received in the tool posts, are stored in a tool post shape storing memory (4). At the time of tool selection, a punching inhibit computing circuit (1) computes a punching inhibit region for a selected one of the tools on the basis of the stored contents of the work holder region storing memory (4) and the tool post shape storing memory (4). Immediately before the execution of a punch command, a collision preventing circuit (1) checks whether the position of the selected tool is within the punching inhibit region or not, and if so, it stops the operation of the machine.
    Type: Grant
    Filed: January 23, 1986
    Date of Patent: March 24, 1987
    Assignee: Fanuc Ltd
    Inventor: Takao Sasaki
  • Patent number: 4627253
    Abstract: A continuously running mechanical transfer press includes a workpiece transfer system in which electric motors are used to provide reciprocating movements in the clamp, lift and transfer axes. An independent backup tracking system including a fault detection sensing control is provided which utilizes independent measures of the position of the workpiece transfer system in all three axes along with an independent measure of the position of the press die in its cycle to monitor proper synchronization and operation of the workpiece transfer system. The fault detection system indicates a fault in the event the transfer system loses synchronization with the moving die, in the event two separate measures of die position are not in agreement, or in the event the transfer system fails to maintain parallelism of the two transfer rails included in the system. The press is stopped in response to detection of a fault to protect the press and the transfer system from damage.
    Type: Grant
    Filed: July 25, 1984
    Date of Patent: December 9, 1986
    Assignee: Verson Allsteel Press Co.
    Inventors: Rick L. Tennessen, Harry W. Schulz, Allen J. Vanderzee
  • Patent number: 4593547
    Abstract: A hydraulic overload control system for a mechanical power press having a flywheel driven eccentric shaft and one or more pitmen drivingly coupled to the eccentric shaft. The press has a slide drivingly coupled to the pitmen by corresponding hydraulic piston and cylinder connections.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: June 10, 1986
    Assignee: Danly Machine Corporation
    Inventor: Francis E. Heiberger
  • Patent number: 4420957
    Abstract: An improved particle blasting apparatus for continuously monitoring media flow, nozzle wear, and nozzle blockage. The apparatus includes a source of compressed air, a nozzle, structure for conveying the compressed air from the source to the nozzle in an airstream, structure for introducing the media into the airstream to be carried by the airstream, and an air flow rate meter in the air conveying structure to indicate the air flow rate therein. In a preferred embodiment, indicator lights are included which are illuminated if the air flow rate falls outside of an acceptable range. A method of using the particle blasting apparatus is also disclosed.
    Type: Grant
    Filed: October 26, 1981
    Date of Patent: December 20, 1983
    Assignee: Progressive Blasting Systems, Inc.
    Inventor: Joseph H. Weber
  • Patent number: 4391358
    Abstract: Presented is a hardware punch and/or press apparatus adapted to assemble fastening devices to or punch holes in hardware for various purposes. The apparatus includes a stationary tool or anvil on which hardware on which an operation is to be performed is supported, and a hydraulically operated ram adapted to move against the work piece or hardware upon activation of an appropriate switch. In one aspect of the invention, a mechanism is provided to effect retraction of the hydraulically operated ram without the imposition of a destructive pressure if the operator's finger is contacted by the ram.
    Type: Grant
    Filed: November 5, 1980
    Date of Patent: July 5, 1983
    Inventor: Virgil J. Haeger
  • Patent number: 4217068
    Abstract: A protection device is provided for a machine which works sheet shaped material to stop the displacement of the machine when the protection device encounters an obstacle. The machine includes clamps which are displaced by the machine and which hold the material. The protection device includes two blades arranged parallel to each other and disposed on the machine in a loop shape surrounding each clamp. The two blades form a pair of normally open contacts of which at least the outer blade is flexible and resiliently deformable to allow the blades to be brought into contact with each other and close the contacts when the outer blade encounters the obstacle. A stop device is coupled to the normally open contacts to stop the displacement of the machine when the contacts are closed.
    Type: Grant
    Filed: August 31, 1978
    Date of Patent: August 12, 1980
    Assignee: Raskin S.A.
    Inventor: Marcel Fossard
  • Patent number: 4170121
    Abstract: A protective device for preventing a machine, such as a reversing roll stand, from receiving a new workpiece unless the machine has been reset after the previous workpiece leaves. The device includes an electronic circuit which is set automatically when the previous workpiece leaves and is reset when the machine is reset. In the example of a roll stand, the circuit permits a reverse pass and another forward pass even though the stand is not reset.
    Type: Grant
    Filed: May 11, 1978
    Date of Patent: October 9, 1979
    Assignee: United States Steel Corporation
    Inventor: David L. Koon