Patents by Inventor Masatake Tamaru

Masatake Tamaru has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9086114
    Abstract: A hydraulic mount includes: a container in which a high-viscosity fluid is liquid-tightly sealed; a rubber mount that is provided on an upper side of the container; a rod that slidably penetrates through the rubber mount; a damper plate that is provided to an end of the rod; a damping force generator that is provided by a clearance between the container and the damper plate; a main fluid chamber that includes an upper fluid chamber and a lower fluid chamber provided by dividing an interior of the container by the damper plate; a volume-variable secondary fluid chamber that communicates with the main fluid chamber; and a pressurizer that generates a differential pressure between the upper fluid chamber and the lower fluid chamber during the movement of the rod.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: July 21, 2015
    Assignee: Komatsu Ltd.
    Inventors: Shin Kashiwabara, Toshio Yamashita, Masayuki Konishi, Shinji Mitsuta, Masatake Tamaru
  • Patent number: 8366212
    Abstract: The crawler-type travel device includes a plurality of shoe plates, a first link section, a rotational wheel, and a shaft. The rotational wheel includes a first roller and a second roller. The first roller makes contact with first end portions corresponding to axial outer ends of the first link members forming the first link section. The second roller is aligned with and disposed on the axial inner side of the first roller. The second roller is rotatable independently from the first roller. The second roller makes contact with second end portions corresponding to axial inner ends of the first link members.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: February 5, 2013
    Assignee: Komatsu Ltd.
    Inventors: Kazuo Maeda, Masatake Tamaru
  • Patent number: 8246020
    Abstract: A vibration isolator includes layered rubbers interposed between a support body and a movable body, and a pair of dampers attached to the support body at one ends and to the movable body at the other ends. The layered rubbers are arranged to be spaced apart in an anterior and posterior direction and in a left and right direction, with reference to a direction in which an operator faces when seated. One of the dampers is arranged at a position corresponding to a middle of the left and right direction between the layered rubbers arranged in the left and right direction, and aligned in the anterior and posterior direction. The other one of the dampers is arranged closer to an anterior side than a middle of the anterior and posterior direction between the layered rubbers arranged in the anterior and posterior direction, and aligned in the lift and right direction.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: August 21, 2012
    Assignee: Komatsu Ltd.
    Inventors: Shinya Nakamura, Toshio Yamashita, Shinji Mitsuta, Masatake Tamaru, Hiroyuki Itoh
  • Publication number: 20110221107
    Abstract: A hydraulic mount includes: a container in which a high-viscosity fluid is liquid-tightly sealed; a rubber mount that is provided on an upper side of the container; a rod that slidably penetrates through the rubber mount; a damper plate that is provided to an end of the rod; a damping force generator that is provided by a clearance between the container and the damper plate; a main fluid chamber that includes an upper fluid chamber and a lower fluid chamber provided by dividing an interior of the container by the damper plate; a volume-variable secondary fluid chamber that communicates with the main fluid chamber; and a pressurizer that generates a differential pressure between the upper fluid chamber and the lower fluid chamber during the movement of the rod.
    Type: Application
    Filed: October 2, 2009
    Publication date: September 15, 2011
    Applicant: KOMATSU LTD.
    Inventors: Shin Kashiwabara, Toshio Yamashita, Masayuki Konishi, Shinji Mitsuta, Masatake Tamaru
  • Publication number: 20100270856
    Abstract: The crawler-type travel device includes a plurality of shoe plates, a first link section, a rotational wheel, and a shaft. The rotational wheel includes a first roller and a second roller. The first roller makes contact with first end portions corresponding to axial outer ends of the first link members forming the first link section. The second roller is aligned with and disposed on the axial inner side of the first roller. The second roller is rotatable independently from the first roller. The second roller makes contact with second end portions corresponding to axial inner ends of the first link members.
    Type: Application
    Filed: January 16, 2009
    Publication date: October 28, 2010
    Applicant: KOMATSU LTD.
    Inventors: Kazuo Maeda, Masatake Tamaru
  • Patent number: 7401658
    Abstract: An object of the invention is to provide a blade preferable for being mounted on various kinds of work machines, particularly work machines for digging, carrying of soil and leveling, in which increase in a quantity of soil per tractional force is achieved with a simple structure to reduce consumption horsepower and increase fuel consumption efficiency thereby leading to low cost.
    Type: Grant
    Filed: February 6, 2007
    Date of Patent: July 22, 2008
    Assignee: Komatsu Ltd.
    Inventors: Norihisa Matsumoto, Masatake Tamaru
  • Publication number: 20070209811
    Abstract: An object of the invention is to provide a blade preferable for being mounted on various kinds of work machines, particularly work machines for digging, carrying of soil and leveling, in which increase in a quantity of soil per tractional force is achieved with a simple structure to reduce consumption horsepower and increase fuel consumption efficiency thereby leading to low cost. A blade comprises a central front face section having a linear first cutting edge at a bottom end thereof, a jointed front face section having a second cutting edge which continues from the first cutting edge and extends backward at a predetermined angle, and an end front face section having a third cutting edge which continues from the second cutting edge and extended forward at a predetermined angle. The first cutting edge is protruded forward of the second and third cutting edges in their top view or intersection points of the second and third cutting edges are disposed backward relative to an extension of the first cutting edge.
    Type: Application
    Filed: February 6, 2007
    Publication date: September 13, 2007
    Inventors: Norihisa Matsumoto, Masatake Tamaru
  • Patent number: 7191846
    Abstract: An object of the invention is to provide a blade preferable for being mounted on various kinds of work machines, particularly work machines for digging, carrying of soil and leveling, in which increase in a quantity of soil per tractional force is achieved with a simple structure to reduce consumption horsepower and increase fuel consumption efficiency thereby leading to low cost. A blade comprises a central front face section having a linear first cutting edge at a bottom end thereof, a jointed front face section having a second cutting edge which continues from the first cutting edge and extends backward in an expanding manner at a predetermined angle, and an end front face section having a third cutting edge which continues from the second cutting edge and extended forward in an expanding manner at a predetermined angle.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: March 20, 2007
    Assignee: Komatsu Ltd.
    Inventors: Norihisa Matsumoto, Masatake Tamaru
  • Patent number: 7172257
    Abstract: A crawler track tension adjusting device is provided in which a driving unit having a closed structure carries out automatic tension adjustment in response to a control signal to create optimum tension on a crawler belt. The crawler track tension adjusting device includes a tension adjusting cylinder which is operable to control the tension and is actuated by a hydraulic pump that is driven by a motor. An electromagnetic direction selector valve is disposed in an oil pipeline for connecting the hydraulic pump to the tension adjusting cylinder, and a hydraulic sensor for detecting the operating condition of the tension adjusting cylinder is disposed in the hydraulic circuit in which the tension adjusting cylinder, the hydraulic pump and the selector valve are provided. The hydraulic sensor is connected to a controller to operate the hydraulic pump and the direction selector valve so as to control the tension adjusting cylinder.
    Type: Grant
    Filed: March 23, 2004
    Date of Patent: February 6, 2007
    Assignee: Komatsu Ltd.
    Inventors: Masatake Tamaru, Teiji Yamamoto, Shigeru Yamamoto
  • Publication number: 20050211451
    Abstract: An object of the invention is to provide a blade preferable for being mounted on various kinds of work machines, particularly work machines for digging, carrying of soil and leveling, in which increase in a quantity of soil per tractional force is achieved with a simple structure to reduce consumption horsepower and increase fuel consumption efficiency thereby leading to low cost. A blade comprises a central front face section having a linear first cutting edge at a bottom end thereof, a jointed front face section having a second cutting edge which continues from the first cutting edge and extends backward in an expanding manner at a predetermined angle, and an end front face section having a third cutting edge which continues from the second cutting edge and extended forward in an expanding manner at a predetermined angle.
    Type: Application
    Filed: November 4, 2004
    Publication date: September 29, 2005
    Inventors: Norihisa Matsumoto, Masatake Tamaru
  • Patent number: 6948417
    Abstract: A fluid cylinder with a swivel joint which is more improved with high utility is provided. To this end, in the fluid cylinder, a flow passage (R2b) leading to a chamber (1F) at the rod side of the cylinder is provided inside a rod (3), and a pin hole (3H) in a rod front end portion (3F) and a pin (P1) fitted in the pin hole (3H) are formed into a swivel joint so that the flow passage (R2b) is always guided to an outside even if the pin hole (3H) and the pin (P1) are relatively rotated.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: September 27, 2005
    Assignees: Komatsu Ltd., Komatsu Zenoah Co.
    Inventors: Tatsuya Futami, Yoshiaki Yamamoto, Kenji Kanemaru, Masatake Tamaru
  • Patent number: 6938701
    Abstract: A blade preferably adopted to work machines for digging, carrying of soil and leveling, which achieves an increase in a quantity of soil per tractional force with a simple structure to reduce consumption horsepower and increase fuel consumption efficiency thereby leading to low cost, has a central front face section (12) having a linear first cutting edge (15) at a bottom end thereof, a jointed front face section (13) having a second cutting edge (16) which continues from the first cutting edge (15) and extends backward at a predetermined angle, and an end front face section (14) having a third cutting edge (17) which continues from the second cutting edge (16) and extended forward at a predetermined angle.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: September 6, 2005
    Assignee: Komatsu Limited
    Inventors: Norihisa Matsumoto, Masatake Tamaru
  • Patent number: 6919865
    Abstract: A display device for displaying information toward outside of a work machine is installed in the work machine.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: July 19, 2005
    Assignee: Komatsu Ltd.
    Inventor: Masatake Tamaru
  • Publication number: 20050098332
    Abstract: A blade preferably adopted to work machines for digging, carrying of soil and leveling, which achieves an increase in a quantity of soil per tractional force with a simple structure to reduce consumption horsepower and increase fuel consumption efficiency thereby leading to low cost, has a central front face section (12) having a linear first cutting edge (15) at a bottom end thereof, a jointed front face section (13) having a second cutting edge (16) which continues from the first cutting edge (15) and extends backward at a predetermined angle, and an end front face section (14) having a third cutting edge (17) which continues from the second cutting edge (16) and extended forward at a predetermined angle.
    Type: Application
    Filed: November 12, 2003
    Publication date: May 12, 2005
    Inventors: Norihisa Matsumoto, Masatake Tamaru
  • Patent number: 6880901
    Abstract: A traveling apparatus of a crawler vehicle can achieve both reduction of an impact applied to an operator cab and maintenance of high traction force even at a time of backward traveling on a ground surface having an irregularity. Right and left track frames (11, 11) are mounted to pivot shafts (31, 31) respectively mounted to right and left sides of a rear end portion of a main frame (30) so as to freely swing in a vertical direction, a rear frame (40) having a horizontal shaft apparatus (46) arranged therein is suspended to a rear portion of the main frame so as to freely swing in the vertical direction, final reduction gears (50) are attached to right and left outer sides of the rear frame, and an output shaft of the horizontal shaft apparatus is connected to an input shaft of the final reduction gear.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: April 19, 2005
    Assignee: Komatsu Ltd.
    Inventor: Masatake Tamaru
  • Publication number: 20050073184
    Abstract: An operator's seat (6) is mounted via a posture adjusting mechanism (40) on a supporting plate (3) supported by at least two damper cylinders (50, 30) at a place where an operator's seat is installed, and at least one of the damper cylinders (50, 30) is used as a damper cylinder (50) for reducing vibrations by making use of a magnetic rheological fluid.
    Type: Application
    Filed: August 19, 2004
    Publication date: April 7, 2005
    Applicant: KOMATSU LTD.
    Inventors: Hideki Tsuji, Masatake Tamaru
  • Publication number: 20050035654
    Abstract: A crawler track tension adjusting device is provided in which a driving unit of a closed structure is used as a control operation mechanism and automatic tension adjustment is carried out in response to a control signal to create optimum tension on a crawler belt. To this end, the crawler track tension adjusting device comprises: (a) a tension adjusting cylinder which is operated in a direction to increase tension and in a direction to reduce tension under the same condition; (b) a hydraulic pump driven by a motor; (c) a hydraulic circuit including an electromagnetic direction selector valve disposed in an oil pipeline for connecting the hydraulic pump to the tension adjusting cylinder; and (d) a hydraulic sensor for detecting the operating condition of the tension adjusting cylinder disposed in the hydraulic circuit. The hydraulic sensor is connected to an additionally installed controller to operate the hydraulic pump and the direction selector valve thereby controlling the tension adjusting cylinder.
    Type: Application
    Filed: March 23, 2004
    Publication date: February 17, 2005
    Applicant: KOMATSU LTD.
    Inventors: Masatake Tamaru, Teiji Yamamoto, Shigeru Yamamoto
  • Publication number: 20050029866
    Abstract: Right and left track adjusters each comprise a tension adjusting cylinder operable in forward and backward directions in the same condition; a motor-driven hydraulic pump; and a direction selector valve disposed in a hydraulic circuit for connecting the motor-driven hydraulic pump to the tension adjusting cylinder. The hydraulic circuit includes operating condition detecting means for detecting the operating condition of the tension adjusting cylinder. A controller located in the work vehicle judges a signal released from the operating condition detecting means. If the pressure condition is determined to be higher than a preset value, the tension adjusting cylinder is moved backward to avoid abnormal tension in the crawler belt. If it has a steady-state value, the movement of the tension adjusting cylinder is controlled according to a judgment based on a set value corresponding to the traveling direction of the vehicle, thereby properly adjusting the tension of the crawler belt.
    Type: Application
    Filed: June 25, 2004
    Publication date: February 10, 2005
    Applicant: KOMATSU LTD.
    Inventors: Masatake Tamaru, Teiji Yamamoto, Shigeru Yamamoto
  • Publication number: 20040056531
    Abstract: A traveling apparatus of a crawler vehicle can achieve both reduction of an impact applied to an operator cab and maintenance of high traction force even at a time of backward traveling on a ground surface having an irregularity. Right and left track frames (11, 11) are mounted to pivot shafts (31, 31) respectively mounted to right and left sides of a rear end portion of a main frame (30) so as to freely swing in a vertical direction, a rear frame (40) having a horizontal shaft apparatus (46) arranged therein is suspended to a rear portion of the main frame so as to freely swing in the vertical direction, final reduction gears (50) are attached to right and left outer sides of the rear frame, and an output shaft of the horizontal shaft apparatus is connected to an input shaft of the final reduction gear.
    Type: Application
    Filed: September 4, 2003
    Publication date: March 25, 2004
    Applicant: KOMATSU LTD.
    Inventor: Masatake Tamaru
  • Patent number: 6708787
    Abstract: Hybrid construction equipment leveling an engine load and effectively performing regeneration of energy is provided. For this purpose, the construction equipment includes a hydraulic pump (2) and a first electric motor (7) driven by an engine (1), a battery (9) for charging electric power generated by the first electric motor, a second electric motor (10) driven by electric power of the battery and functioning as a generator at a time of braking revolution, a swash plate angel sensor 33 and a pressure sensor 34 for the hydraulic pump, and a controller (5) for controlling the first electric motor as a generator by surplus torque when absorption torque is smaller than predetermined output torque of the engine and controlling the first electric motor as a motor to generate an amount of shortage of torque when the absorption torque is larger than the predetermined torque.
    Type: Grant
    Filed: February 25, 2002
    Date of Patent: March 23, 2004
    Assignee: Komatsu Ltd.
    Inventors: Masami Naruse, Masatake Tamaru, Kenzo Kimoto