Patents by Inventor Chigaya Sekine

Chigaya Sekine 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: 8141227
    Abstract: An assembly of sheet materials in which a first sheet of material and a second sheet of material are disposed in an overlapping relationship, with a plurality of joint portions being formed therebetween by drawing an overlapping part of the first and second sheets of materials at a plurality of positions. The plurality of joint portions includes at least one first joint portion in which the first sheet of material is laterally extruded into the second sheet of material and at least one second joint portion in which the first sheet of material and the second sheet of material are in contact with each other in a cup-like surface configuration.
    Type: Grant
    Filed: September 5, 2008
    Date of Patent: March 27, 2012
    Assignee: Kabushiki Kaisha Hitachi Seisakusho
    Inventors: Makoto Nishimura, Chigaya Sekine
  • Publication number: 20090007409
    Abstract: The present invention provides an assembly of sheet materials in which a first sheet of material and a second sheet of material are disposed in an overlapping relationship, with a plurality of joint portions being formed therebetween by drawing an overlapping part of the first and second sheets of materials at a plurality of positions. The plurality of joint portions includes at least one first joint portion in which the first sheet of material is laterally extruded into the second sheet of material and at least one second joint portion in which the first sheet of material and the second sheet of material are in contact with each other in a cup-like surface configuration.
    Type: Application
    Filed: September 5, 2008
    Publication date: January 8, 2009
    Inventors: Makoto Nishimura, Chigaya Sekine
  • Publication number: 20040168297
    Abstract: The present invention provides an assembly of sheet materials in which a first sheet of material and a second sheet of material are disposed in an overlapping relationship, with a plurality of joint portions being formed therebetween by drawing an overlapping part of the first and second sheets of materials at a plurality of positions. The plurality of joint portions includes at least one first joint portion in which the first sheet of material is laterally extruded into the second sheet of material and at least one second joint portion in which the first sheet of material and the second sheet of material are in contact with each other in a cup-like surface configuration.
    Type: Application
    Filed: November 26, 2003
    Publication date: September 2, 2004
    Inventors: Makoto Nishimura, Chigaya Sekine
  • Patent number: 6092816
    Abstract: A cylinder 3 is fitted with a piston 5. A pump rod 12 is fitted into a pump tube 11 in a piston rod 6 to form a pump chamber 13. An oil tank 17 is connected to the pump chamber 13 by a line 16 through a switching valve mechanism 18. An accumulator tank 20 is connected to the cylinder 3 by a line 19 through a switching valve 21. Normally, the switching valve 21 is closed, and a switching valve 26 is set to a position (a) in which the fluid flows to the pump chamber through a check value 27. By using the pump chamber 13 and check valves 23 and 27, a hydraulic fluid is supplied from the oil tank 17 to the accumulator tank 20 by the extension and contraction of the piston rod 6, thereby accumulating the pressurized hydraulic fluid in the accumulator tank 20. By opening the switching valve 21, the cylinder 3 is pressurized to raise the vehicle height.
    Type: Grant
    Filed: April 10, 1998
    Date of Patent: July 25, 2000
    Assignee: Tokico Ltd
    Inventors: Chigaya Sekine, Tetuo Katoh, Kenichi Nakamura
  • Patent number: 5941508
    Abstract: A hydraulic shock absorber including a cylinder having a hydraulic fluid sealed therein, a reservoir connected to the cylinder so that a pressure is always transmitted between the cylinder and the reservoir and a self-pumping mechanism provided between the cylinder and an oil tank to effect feeding and discharge of the hydraulic fluid between the oil tank and the cylinder by extension and contraction of a piston rod, to thereby control a length of extension of the piston rod. The cylinder is connected to a pressure accumulating mechanism having a pressure accumulating tank and a switching valve mechanism. The switching valve mechanism is adapted to be switched to accumulate a pressure in the pressure accumulating tank or apply a pressure accumulated in the pressure accumulating tank to the cylinder.
    Type: Grant
    Filed: May 21, 1997
    Date of Patent: August 24, 1999
    Assignee: Tokico Ltd.
    Inventors: Hiroshi Murata, Chigaya Sekine
  • Patent number: 5797594
    Abstract: A hydraulic shock absorber has a case that includes an oil chamber, a cylinder and a reservoir chamber inside the case. A piston connected to a piston rod is fitted into the cylinder. A pump rod is fitted into a pump tube located inside the piston rod for forming a pump chamber. The pump chamber is communicated with an oil chamber through an oil passage and with a cylinder upper chamber through another oil passage. The motion of the pump rod caused by extension and retraction of the piston rod allows oil to flow from the oil chamber to the pump chamber and then to the cylinder upper chamber for extending the piston rod. When a vehicle height is increased to a normal height, cut-outs formed in the pump rod serve to communicate the pump chamber with the cylinder upper chamber for stopping the extension of the piston rod. When it becomes higher than the normal height, an orifice passage serves to relieve oil of the cylinder upper chamber to the oil chamber for lowering the vehicle height.
    Type: Grant
    Filed: July 18, 1996
    Date of Patent: August 25, 1998
    Assignee: Tokico, Ltd.
    Inventors: Chigaya Sekine, Hiromi Machida
  • Patent number: 5655633
    Abstract: A piston connected to a piston rod is slidably mounted in a cylinder, and a lower cylinder chamber is connected to a reservoir. An extension side passage for communicating an upper cylinder chamber with the lower cylinder chamber and a compression side passage for communicating the cylinder chamber with the reservoir are provided with disc valves, respectively, behind which extension side and compression side back pressure chambers are formed. The extension side back pressure chamber is communicated with the upper and lower cylinder chambers through a fixed orifice and ports. The compression side back pressure chamber is communicated with the lower cylinder chamber and the reservoir through a fixed orifice and ports. By rotating a shutter, flow areas of the ports are changed to adjust orifice features and pressures in the extension side and compression side back pressure chambers are changed to adjust valve features.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: August 12, 1997
    Assignee: Tokico Ltd.
    Inventors: Takao Nakadate, Akira Kashiwagi, Takashi Nezu, Chigaya Sekine