Patents by Inventor Naoki Hagiwara
Naoki Hagiwara 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).
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Publication number: 20150224510Abstract: Provided is a classifier-equipped media-agitation type pulverizer, which is capable of moving up pulverized particles to a classification section by supplying a secondary gas in an amount less than ever before, thereby enhancing classification capability of a classifying wheel.Type: ApplicationFiled: February 19, 2013Publication date: August 13, 2015Inventors: Tsuyoshi Ishikawa, Naoki Hagiwara
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Patent number: 8919115Abstract: The operability when performing a combined arm-crowd and bucket operation can be improved. A hydraulic drive device for a hydraulic excavator includes: a bucket directional control valve and a second arm directional control valve, which are connected in parallel tandem with a first hydraulic pump; a first arm directional control valve that is connected to a second hydraulic pump; and a flow rate restriction device that restricts the flow rate of pressure oil supplied to the second arm directional control valve, during crowd operation of a bucket. This flow rate restriction device includes a variable throttle whose opening is controlled so as to become smaller as a bucket operating device is operated to the crowd side, the variable throttle being provided in a bypass path connecting to the supply port of the second arm directional control valve.Type: GrantFiled: February 9, 2011Date of Patent: December 30, 2014Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Naoki Hagiwara, Yasuo Okano, Tsuyoshi Nakamura, Kouji Ishikawa, Kazunori Nakamura
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Publication number: 20140367504Abstract: It is intended to, in a horizontal dry mill, prevent blow-up and adhesion of a raw material, etc., to a raw material input section. In a horizontal dry mill (10) of the present invention, a diameter of a raw material supply section (13) provided in a grinding tank (14) is set to be less than a diameter of a grinding chamber (12). Further, a diameter of a mechanical thrust generating device of the raw material supply section (13) is set to a small value according to the diameter of the raw material supply section. Furthermore, a gap (e1) between an outside dimension of a screw (26) as the mechanical thrust generating device and an inner diameter of the grinding tank (14) in the raw material supply section (13) is set between 0.5 mm and ? of a diameter of each grinding medium M.Type: ApplicationFiled: December 6, 2012Publication date: December 18, 2014Inventors: Tsuyoshi Ishikawa, Naoki Hagiwara, Toshihiro Yamada
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Patent number: 8650778Abstract: A hydraulic drive system realizes a jack-up operation without arrangement of a flow rate control valve and center bypass selector valve. The hydraulic drive system has first and second hydraulic pumps, first and second directional control valves for controlling boom cylinders, a third directional control valve for controlling the boom cylinders, and a third hydraulic pump for feeding pressure oil to the third directional control valve. A jack-up selector valve has a second select position where, when a pressure in bottom chambers of the boom cylinders is not higher than a predetermined pressure, feeding of pressure oil, which is delivered from the first hydraulic pump and second hydraulic pump, to rod chambers of the boom cylinders, is held permissible in association with switching of the second directional control valve and third directional control valve by a manipulation of a control device.Type: GrantFiled: September 1, 2010Date of Patent: February 18, 2014Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Yasuo Okano, Tsuyoshi Nakamura, Kouji Ishikawa, Kensuke Sato, Naoki Hagiwara
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Patent number: 8589038Abstract: A hydraulic drive system for a working machine provides improved safety during forced regeneration. Upon input of a forced regeneration command signal from a forced regeneration switch, a controller detects non-operated states of all hydraulic actuators such as an arm cylinder arranged on a hydraulic excavator based on a lock detection signal from a gate lock detection switch, and also an attitude of a front working mechanism. The attitude is proper from the standpoint of safety. The detection is based on an arm angle signal from an arm angle sensor, a bucket angle signal from a bucket angle sensor and a boom pressure signal from a boom pressure sensor. Taking the detection of the non-operated states and proper attitude as conditions, the controller outputs control signals to a boosting proportional solenoid valve and flow-rate controlling, proportional solenoid valve to make a forced regenerator conduct forced regeneration.Type: GrantFiled: March 15, 2010Date of Patent: November 19, 2013Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Naoki Hagiwara, Tsuyoshi Nakamura, Kensuke Sato, Yasuo Okano, Kouji Ishikawa, Masanori Ezawa
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Patent number: 8516805Abstract: Disclosed is a hydraulic drive system for a working machine, which enables to conduct forced regeneration continuously for a sufficient time. Based on an input of a lock detection signal S1 from a gate lock detection switch 40, a controller 50 detects that a gate lock lever 32 for controlling a gate lock on/off valve 33 is in a locked state, in other words, hydraulic actuators such as an arm cylinder 12 arranged on a hydraulic excavator 1 are all in non-operated states. Upon an input of a forced regeneration command signal So from a forced regeneration switch 53 in this detected state, control signals Cp,Cf are outputted to a boosting control valve 51 and regulator 52 to make a forced regeneration means (an arm cylinder control valve 27 and the regulator 52) conduct forced regeneration.Type: GrantFiled: March 9, 2010Date of Patent: August 27, 2013Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Naoki Hagiwara, Tsuyoshi Nakamura, Kensuke Sato, Yasuo Okano, Kouji Ishikawa, Mitsuhiko Kanehama, Hiroyuki Azuma
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Publication number: 20120163949Abstract: A hydraulic drive system realizes a jack-up operation without arrangement of a flow rate control valve and center bypass selector valve. The hydraulic drive system has first and second hydraulic pumps, first and second directional control valves for controlling boom cylinders, a third directional control valve for controlling the boom cylinders, and a third hydraulic pump for feeding pressure oil to the third directional control valve. A jack-up selector valve has a second select position where, when a pressure in bottom chambers of the boom cylinders is not higher than a predetermined pressure, feeding of pressure oil, which is delivered from the first hydraulic pump and second hydraulic pump, to rod chambers of the boom cylinders, is held permissible in association with switching of the second directional control valve and third directional control valve by a manipulation of a control device.Type: ApplicationFiled: September 1, 2010Publication date: June 28, 2012Applicant: Hitachi Construction Machinery Co., Ltd.Inventors: Yasuo Okano, Tsuyoshi Nakamura, Kouji Ishikawa, Kensuke Sato, Naoki Hagiwara
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Publication number: 20120000191Abstract: Disclosed is a hydraulic drive system for a working machine, which enables to conduct forced regeneration continuously for a sufficient time. Based on an input of a lock detection signal S1 from a gate lock detection switch 40, a controller 50 detects that a gate lock lever 32 for controlling a gate lock on/off valve 33 is in a locked state, in other words, hydraulic actuators such as an arm cylinder 12 arranged on a hydraulic excavator 1 are all in non-operated states. Upon an input of a forced regeneration command signal So from a forced regeneration switch 53 in this detected state, control signals Cp,Cf are outputted to a boosting control valve 51 and regulator 52 to make a forced regeneration means (an arm cylinder control valve 27 and the regulator 52) conduct forced regeneration.Type: ApplicationFiled: March 9, 2010Publication date: January 5, 2012Applicant: Hitachi Construction Machinery Co., Ltd.Inventors: Naoki Hagiwara, Tsuyoshi Nakamura, Kensuke Sato, Yasuo Okano, Kouji Ishikawa, Mitsuhiko Kanehama, Hiroyuki Azuma
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Publication number: 20120003069Abstract: A hydraulic drive system for a working machine provides improved safety during forced regeneration. Upon input of a forced regeneration command signal from a forced regeneration switch, a controller detects non-operated states of all hydraulic actuators such as an arm cylinder arranged on a hydraulic excavator based on a lock detection signal from a gate lock detection switch, and also an attitude of a front working mechanism. The attitude is proper from the standpoint of safety. The detection is based on an arm angle signal from an arm angle sensor, a bucket angle signal from a bucket angle sensor and a boom pressure signal from a boom pressure sensor. Taking the detection of the non-operated states and proper attitude as conditions, the controller outputs control signals to a boosting proportional solenoid valve and flow-rate controlling, proportional solenoid valve to make a forced regenerator conduct forced regeneration.Type: ApplicationFiled: March 15, 2010Publication date: January 5, 2012Inventors: Naoki Hagiwara, Tsuyoshi Nakamura, Kensuke Sato, Yasuo Okano, Kouji Ishikawa, Masanori Ezawa
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Publication number: 20110192155Abstract: The operability when performing a combined arm-crowd and bucket operation can be improved. A hydraulic drive device for a hydraulic excavator includes: a bucket directional control valve and a second arm directional control valve, which are connected in parallel tandem with a first hydraulic pump; a first arm directional control valve that is connected to a second hydraulic pump; and a flow rate restriction device that restricts the flow rate of pressure oil supplied to the second arm directional control valve, during crowd operation of a bucket. This flow rate restriction device includes a variable throttle whose opening is controlled so as to become smaller as a bucket operating device is operated to the crowd side, the variable throttle being provided in a bypass path connecting to the supply port of the second arm directional control valve.Type: ApplicationFiled: February 9, 2011Publication date: August 11, 2011Applicant: Hitachi Construction Machinery Co., Ltd.Inventors: Naoki HAGIWARA, Yasuo Okano, Tsuyoshi Nakamura, Kouji Ishikawa, Kazunori Nakamura
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Patent number: 7113211Abstract: A video signal processing circuit, which performs contour adjustment by means of digital signal processing, is applicable to a viewfinder apparatus for a television camera and an image monitor apparatus, which can be operated both in an NTSC/PAL system and an HDTV system.Type: GrantFiled: March 1, 2000Date of Patent: September 26, 2006Assignees: Alps Electric Co., Ltd., Sony CorporationInventors: Kenichi Seino, Mitsuo Kamiko, Tomoyasu Katsuyama, Yoshihiro Date, Naoki Hagiwara
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Patent number: 7002605Abstract: An image display apparatus fixes the luminance of a blank area and varies only the luminance of an image. The image display apparatus includes an A/D conversion device to convert an input analog image signal into digital image data, a black level setting device for setting the black level of the digital image data by adjusting a lower-limit reference voltage of the A/D conversion device, a blank data generation device to generate blank data to display a blank area around an image display area on the screen, an image data combining device to combine the blank data generated by this blank data generation device and the digital image data output from the A/D conversion device, and a display device to display the output of this image data combining device on the screen.Type: GrantFiled: July 3, 2000Date of Patent: February 21, 2006Assignees: Alps Electric Co., Ltd., Sony CorporationInventors: Tomoyasu Katsuyama, Naoki Hagiwara, Yoshihiro Date, Fumiaki Inage
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Patent number: 6515643Abstract: An image display apparatus has a main display area in which a plurality of pixels are arranged horizontally and vertically in an array condition, and at least one sub display area in which a plurality of pixels are arranged horizontally and vertically in an array condition, provided separately from and outside the main display area. In the image display apparatus, two types of lines are arranged in a matrix manner horizontally and vertically against the main display area and the sub display area to drive the plurality of pixels, and driving units for applying driving signals to the lines arranged in the matrix manner are also provided.Type: GrantFiled: November 23, 1999Date of Patent: February 4, 2003Assignee: Alps Electric Co., Ltd.Inventors: Mitsuo Kamiko, Tomoyasu Katsuyama, Yoshihiro Date, Naoki Hagiwara
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Patent number: 6384867Abstract: A video display apparatus comprises a video-signal processing circuit for processing an input video signal, a PLL circuit for generating a clock signal, a discrimination circuit for identifying the format of the input video signal and a specification circuit for specifying the format of video information to be displayed. In addition, the video display apparatus also includes a diver-control-signal generation circuit, a driver-control-signal switching circuit and a PLL-signal control circuit. The diver-control-signal generation circuit is used for generating control signals for controlling a gate driver and a source driver which are used for driving a display panel in accordance with the identified format of video information to be displayed.Type: GrantFiled: May 25, 2000Date of Patent: May 7, 2002Assignee: Alps Electric Co., Ltd.Inventors: Kenichi Seino, Mitsuo Kamiko, Tomoyasu Katsuyama, Yoshihiro Date, Naoki Hagiwara
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Patent number: 4954937Abstract: A lighting lamp is disclosed, comprising a lamp having laminated on the surface of a bulb thereof a display sheet, said display sheet comprising a support having thereon an active layer containing a pigment which is faded by the action of an active light and an active light-adjusting layer.Type: GrantFiled: September 8, 1989Date of Patent: September 4, 1990Assignees: Tomoegawa Paper Co., Ltd., Hitachi Ltd.Inventors: Yasuo Kobayashi, Naoki Hagiwara, Taisuke Hirota, Churyo Kodama, Yasuo Hirasawa, Katsumi Miyazaki, Fumio Kawamura, Takao Higashi, Masami Yanagisawa, Akinori Sei
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Patent number: 4540915Abstract: A fluorescent lamp having a phosphor layer composed of a glass material represented by the general formula:xLn.sub.2 O.sub.3.yMO.wM'.vM.sub.2 "O.zB.sub.2 O.sub.3(wherein Ln is at least one element selected from the group consisting of Y and lanthanum series elements, M is at least one element selected from the group consisting of Mg, Ca, Sr, Ba and Zn, M' is at least one oxide selected from the group consisting of Al.sub.2 O.sub.3, SiO.sub.2 and Sb.sub.2 O.sub.3, M" is at least one element selected from the group consisting of Li, Na and K, and x, y, z, w and v are the numerical values defined by 1.ltoreq.x.ltoreq.30, 0.ltoreq.y.ltoreq.60, 0.ltoreq.w.ltoreq.20, 0<v.ltoreq.15 and 30.ltoreq.z.ltoreq.80 in molar percent, respectively, but y+w is a value defined by 0.ltoreq.y+w.ltoreq.60 in molar percent), and a phosphor. Said glass material is insoluble in water and can be worked into a water-soluble slurry with said phosphor and other component materials for forming a phosphor layer.Type: GrantFiled: April 29, 1982Date of Patent: September 10, 1985Assignee: Hitachi, Ltd.Inventors: Kouki Shinkai, Naoki Hagiwara, Masaki Nakano