Patents Assigned to Kabushiki Kaisha Komatsu Seisakusho
  • Control system for hydraulic fluid pressure
    Patent number: 4658705
    Abstract: A system for controlling the pressure of hydraulic operating fluid selectively supplied from a pressurized hydraulic fluid source into an actuator or actuators for speed-change clutch-brakes of a multi-stage power shift transmission through hydraulic fluid circuits by the interposition of predetermined directional control valves selected from a plurality of directional control valves connected with the actuators, respectively, has a hydraulic fluid pressure control valve assembly including a pressure modulating valve, a modulating relief valve, and a device for raising a preset relief pressure of the modulating relief valve. The preset relief pressure raising device comprises a balance piston-cylinder assembly actuated by a pressurized pilot fluid supplied from the pressurized hydraulic fluid source.
    Type: Grant
    Filed: June 27, 1984
    Date of Patent: April 21, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventor: Fujio Maeda
  • Method for cutting uncoiled web
    Patent number: 4656857
    Abstract: In an uncoiled web feed line including a shear, continuous feed and measuring pinch rolls, a pit for accommodating a loop portion of an uncoiled web, intermittent feed pinch rolls and a metal mold arranged in succession, there is provided a novel method for cutting an uncoiled web at its midway position by a shear such that when the production by the metal mold is continued for the uncoiled web forward of the cut position, just one lot of a desired number of products can be produced without being associated with an excessive waste web.
    Type: Grant
    Filed: November 21, 1985
    Date of Patent: April 14, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventor: Yoshikazu Tomita
  • Device for varying feed stroke of feed bars for use in a transfer press
    Patent number: 4655097
    Abstract: This invention relates to a device for varying feed stroke of feed bars for use in a transfer press. According to the device of the invention, the feed stroke of feed bars is varied by the action of a substantially parallel four-node linkage connected through a connecting rod to the feed bars and actuated by a rotary cam.
    Type: Grant
    Filed: October 22, 1985
    Date of Patent: April 7, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventor: Masami Suzuki
  • Die assembly for use in general type mechanical press machine
    Patent number: 4653310
    Abstract: A die assembly for use in a general type mechanical press machine has opposite upper and lower dies adapted to be fitted in upper and lower die sets, respectively, so as to be slidable freely by a predetermined stroke, and a differential mechanism interposed between the upper and lower dies so as to transmit a predetermined rate of displacement to the lower die in accordance with the movement or displacement of the upper die set. The differential mechanism comprises a rack and pinion mechanism or linkage having two pair of link mechanisms.
    Type: Grant
    Filed: April 9, 1984
    Date of Patent: March 31, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Chieo Urata, Yasuo Suzuki
  • Apparatus for cutting ribbed bars or the like into desired lengths
    Patent number: 4653367
    Abstract: Two pairs of opposed feed rolls are rotatably mounted on the upstream and downstream sides, respectively, of a bar cutting mechanism with respect to the predetermined traveling direction of the bar. Each feed roll pair comprises a fixed feed roll on one side of the bar and a movable feed roll on the other side, with the movable feed roll being movable toward and away from the fixed feed roll. A drive mechanism constantly rotates each pair of opposed feed rolls, so that the bar is fed only when being pressed against the fixed feed roll by the movable feed roll. The feed roll pair on the downstream side of the cutting mechanism is further jointly movable laterally of the path of the bar against the force of a spring for lessening the load exerted thereon, and for preventing the bending of the bar, when the bar is being cut by the cutting mechanism.
    Type: Grant
    Filed: August 21, 1985
    Date of Patent: March 31, 1987
    Assignees: Kabushiki Kaisha Komatsu Seisakusho, Aoki Corporation
    Inventors: Toshiyuki Miki, Kunio Tomioka, Terushige Sakurai, Masao Nakajima
  • Control circuit for transfer device
    Patent number: 4654569
    Abstract: In a control circuit for a transfer device including feed bars movable along two or three axes and servo-actuators respectively provided for driving the feed bars in stroke-forming movements along the axes, there are provided a stroke signal generator for generating a stroke defining signal separately from press movement and press control device for controlling the operation of a press. Based on the output signal from the stroke signal generator, the press control delivers press starting and stopping instructions at appropriate instants not interfere with the movements of the feed bars for initiating press operations of an intermittent nature.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: March 31, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Masakatsu Mizumoto, Yasuhiro Umano
  • Apparatus mounted on vehicles for detecting road surface conditions
    Patent number: 4653316
    Abstract: A road surface is scanned with a laser beam in a direction transverse to the road surface to pick up the scanning locus of the laser beam on the road surface in a direction inclined to a beam scanning surface so as to obtain transverse profile data. The laser light reflected from the road surface is received in a direction inclined to the beam scanning surface for obtaining crack data. The distances to the road at three points in the longitudinal direction of a measuring car are measured. The running distance of the car is measured and the measured distance data are recorded in a recording device together with crack data, transverse profile data and longitudinal profile data.
    Type: Grant
    Filed: March 14, 1986
    Date of Patent: March 31, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventor: Toshihiko Fukuhara
  • Controller device for wheeled construction machine
    Patent number: 4649768
    Abstract: A controller device for a wheeled construction machine has a variable speed lever for electrically controlling steps of speed of a transmission disposed near a steering wheel. It comprises a combination switch box disposed at the top of a steering column, a variable speed lever of a length enough for the leading end thereof to protrude slightly from the periphery of the steering wheel disposed on the left side of the combination switch box in such a manner as to approximate the steering wheel, and a control lever for turning on and off various lamps disposed protrudingly on the right side of the combination switch box. At least either of the variable speed lever and the control lever is attached to the combination switch box.
    Type: Grant
    Filed: December 18, 1985
    Date of Patent: March 17, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Kohei Kusaka, Masaaki Ichimura, Yuuichi Anami
  • Press machine
    Patent number: 4648786
    Abstract: A press machine has a transfer device for transferring blanks to be machined from a blank supply station to a blank machining station. The transfer device includes a rail extending in the longitudinal direction of a bed of the press machine and mounted in front of a press machine body through brackets fixedly secured, respectively, to side faces of the press machine body, a main body located in front of the press machine body so as to be movable along the rail, a lift member mounted on the main body so as to be movable in the vertical direction, a transfer unit fitted to the lift member so as to be movable back and forth with respect to the press machine body, and drive units for driving the main body, lift member and transfer unit, respectively.
    Type: Grant
    Filed: December 9, 1982
    Date of Patent: March 10, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventor: Terushige Sakurai
  • Hydraulic control apparatus
    Patent number: 4646622
    Abstract: A hydraulic control apparatus has at least two meter-in and two meter-out poppet valves. In order to be compact and deal with a great flow rate, the apparatus is arranged such that a pair of meter-in poppet valves and load check valves are located in an upper horizontal plane, a pair of meter-out poppet valves and solenoid-actuated pilot valves are located in a lower horizontal plane, and a pair of a pilot valve associated with the meter-out poppet valve and a reducing valve associated with the meter-in poppet valve are located in a middle horizontal plane and are respectively disposed in opposed relationship to each other, and the load check valve is vertically located in parallel relationship with the meter-out poppet valve.
    Type: Grant
    Filed: November 21, 1985
    Date of Patent: March 3, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Naoki Ishizaki, Sadao Nunotani, Tatsumi Tada, Kazuo Uehara, Shuki Akushicki
  • Monitoring apparatus for a construction machine
    Patent number: 4644334
    Abstract: A monitoring apparatus for a construction machine having an engine includes sensors for detecting abnormality conditions at various predetermined inspection positions. A warning system, cooperating with the sensors, provides an engine idling signal and a visual display in accordance with the detected abnormality condition. A delay circuit causes the warning system to activate the visual display only if the abnormality condition continues for a predetermined time after issuance of the engine idling signal. The engine idling signal itself is provided without delay upon detection of the abnormality condition, and causes the engine to idle.
    Type: Grant
    Filed: January 31, 1986
    Date of Patent: February 17, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Tokuhiro Yato, Yoshio Tsutsumi
  • Method of identifying contour lines
    Patent number: 4644583
    Abstract: A contour line of a circle or an object having a configuration close to a circle or a portion thereof is identified by presuming picture image data representing a contour candidate point of the object to be detected among picture image data representing the brightness of one picture in which the object presents, and then scanning the picture image data of a predetermined region containing the picture image.
    Type: Grant
    Filed: January 14, 1985
    Date of Patent: February 17, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Yuji Watanabe, Kozo Kato
  • Method for feeding material sheet to a press
    Patent number: 4641828
    Abstract: A method for feeding material sheet to a press comprises steps of transferring a material sheet on which print parts and the corresponding positioning marks are printed for a preset distance at least until the positioning mark comes into the field of view of a viewing device provided in a position related to the working position of the press, detecting misalignment between the centers of the positioning mark and a reference mark of the field of view in the X and Y axis directions by the viewing device, and positioning the print part at the press working position automatically and precisely by using the detected amount of the misalignment as a correction value for positioning.
    Type: Grant
    Filed: December 27, 1985
    Date of Patent: February 10, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventor: Toshio Yajima
  • Method of controlling an engine mounted on a construction vehicle
    Patent number: 4640245
    Abstract: A method of controlling an engine mounted on a construction vehicle comprising the steps of reducing the rotation of the engine to a primary number of revolutions per minute, which is in the vicinity of the rated number of revolutions per minute of the engine under earth moving operation conditions, immediately after all operating levers associated with all of the control valves for turning the vehicle body, for actuating work implements and for running of the vehicle are shifted to their neutral positions, maintaining the engine under such a low speed running condition for a predetermined period of time, and then reducing further the rotation of the engine to a lower, secondary number of revolutions per minute which corresponds to the number of revolutions per minute under idle running conditions thereby achieving reduction in fuel consumption and level of noise generated by the engine.
    Type: Grant
    Filed: May 28, 1985
    Date of Patent: February 3, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Yukinobu Matsuda, Takayasu Inui
  • Apparatus for controlling an engine in a hydraulically driven vehicle
    Patent number: 4638779
    Abstract: An apparatus for controlling the engine of a hydraulically driven vehicle includes a transmission mechanism having a loose spring and connecting a fuel control lever operationally to a governor control lever, a decelerator cylinder including a spring having a slightly larger spring force than the loose spring and disposed on the opposite side of a piston from a hydraulic fluid chamber and a piston rod connected to the transmission mechanism by a yoke having a slot, an electromagnetic valve for supplying a hydraulic fluid from a hydraulic pump driven by the engine to the hydraulic fluid chamber in the decelerator cylinder or interrupting its supply, and an electric circuit for opening or closing the electromagnetic valve.
    Type: Grant
    Filed: March 28, 1985
    Date of Patent: January 27, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventor: Tomowo Kitada
  • Process for making foundry molds
    Patent number: 4638845
    Abstract: A process for making a foundry mold for use in metal casting, which comprises the steps of heating and drying mold sand composed of refractory particles and a water-soluble binding agent, charging a cavity formed in a mold pattern with the mold sand under dried condition, during the charging step, moisture being kept on the peripheral surface of the mold to be made, and heating the whole pattern of which the cavity has been filled completely with the mold sand to thereby cure mainly the peripheral surface of the mold.
    Type: Grant
    Filed: September 10, 1985
    Date of Patent: January 27, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Kanichi Sato, Mikio Setoyama, Shoji Kiguchi, Toshio Tanaka
  • Torque regulating system for fluid operated pump displacement control systems
    Patent number: 4637781
    Abstract: A fluid operated pump displacement control system is provided wherein a self pressure is defined as a first control signal, and characterized in that an arbitrary switchable second control signal different from the first control signal is added to the first control signal, and a displacement is adapted to be switched to a displacement corresponding to a value of the second control signal as added to the first control signal. Further, a fluid operated pump displacement control system is provided comprising a control circuit connected to respective displacement control devices of variable displacement pumps and adapted to be operated by discharge pressure fluid from a discrete control pump.
    Type: Grant
    Filed: March 28, 1985
    Date of Patent: January 20, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Teruo Akiyama, Katsuyuki Sasaki, Takaichi Saigo
  • Method of driving hollow piles into the ground
    Patent number: 4637758
    Abstract: A method and apparatus for driving a hollow pile into the ground. By using a hollow rod having a short auger fixedly secured to a leading end portion thereof, excavated earth and sand are lifted to and around the upper portion of the auger where compressed air is spouted from nozzle orifices formed in the hollow rod thereby lifting the excavated earth and sand through the hollow pile and consequently discharging the same from the hollow pile. As earth and sand are discharged from the hollow pile, the pile is sunk or driven into the ground.
    Type: Grant
    Filed: March 16, 1984
    Date of Patent: January 20, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Hiroaki Tamaki, Joji Nakamura
  • Die cushion apparatus for use in a press machine
    Patent number: 4635466
    Abstract: In a die cushion apparatus, a die cushion mechanism for achieving a die cushioning capability as relying upon a preset pneumatic pressure is provided with a hydraulic pressure chamber into which a piston connected to a die cushion pad is fitted, the hydraulic pressure chamber is provided with a hydraulic pressure feed circuit and an exhaust circuit, a relief valve whose relief pressure is controllable is disposed in the exhaust circuit, and relief pressure control means is coupled to the relief valve.
    Type: Grant
    Filed: April 26, 1985
    Date of Patent: January 13, 1987
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Seiji Seki, Kiyoji Aoshima
  • Automatic control system for a loading and unloading vehicle
    Patent number: 4634332
    Abstract: An automatic control system for a vehicle such as a fork lift truck automates the transportation, loading and unloading operations of the vehicle in a work area. Leader cables disposed in the work area are supplied with instruction signals of respectively different frequencies from terminal units in response to commands from a central control device. Any cable or a combination of two cables forms a ehicle guideway along which the travel of the vehicle is controlled by instruction signal pickup coils on the vehicle and along which loading and unloading stations for the vehicle are located. Loading and unloading are effected without using the leader cables, the necessary instruction signals then being received from the central control device by the vehicle from a coil disposed at the loading and unloading station.
    Type: Grant
    Filed: January 15, 1979
    Date of Patent: January 6, 1987
    Assignees: Kabushiki Kaisha Komatsu Seisakusho, Komatsu Fork Lift Co. Ltd.
    Inventors: Takao Kamide, Norio Ueda, Akira Nemoto