Patents by Inventor Youji Takakuwa
Youji Takakuwa 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: 20150285277Abstract: In a fluid pressure cylinder, first and second cylinder chambers facing respective opposite end surfaces of a piston are formed inside a cylinder tube including a supply port and a discharge port, and a first piston rod connected to one end surface side of the piston is formed to have a greater diameter than that of a second piston rod connected to another end surface side of the piston. Therefore, a second pressure-receiving area of a second pressure-receiving surface formed on the other end surface of the piston is greater than a first pressure-receiving area of a first pressure-receiving surface formed on the one end surface. Pressure fluid in the first cylinder chamber is supplied to the second cylinder chamber, whereby area difference between the first pressure-receiving area and the second pressure-receiving area causes the piston to move toward the first cylinder chamber.Type: ApplicationFiled: December 20, 2012Publication date: October 8, 2015Applicant: SMC KABUSHIKI KAISHAInventor: Youji Takakuwa
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Publication number: 20150198212Abstract: A double-rod type shock absorber includes a rod, first and second pistons held by the rod, first and second piston chambers disposed on an outer side of the first and second pistons, a liquid storage chamber between the first piston and the second piston, a flow path gap formed between an outer peripheral surface of the first and second pistons and an inner peripheral surface of the liquid chamber, and first and second unidirectional flow paths which connect the first and second piston chambers with the liquid storage chamber, wherein, during reciprocating motion of the rod, the unidirectional flow path located on a front side in a movement direction of the rod is closed, and the unidirectional flow path located on a back side in the movement direction of the rod is opened.Type: ApplicationFiled: May 29, 2013Publication date: July 16, 2015Applicant: SMC CORPORATIONInventors: Eiko Miyasato, Youji Takakuwa, Akira Hiroki, Kouichi Matsuzaki, Toshio Minakuchi, Kodai Yoshinaga, Tsuyoshi Mita, Mariko Kessoku
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Publication number: 20150152934Abstract: A bidirectional shock absorber includes a cylinder housing including a liquid chamber, a shock-absorbing mechanism located inside the liquid chamber and supported by a rod sticking out of the cylinder housing. The shock-absorbing mechanism includes a pair of pistons located in the liquid chamber and attached to the rod on the respective sides of a liquid storage chamber constituting an accumulator, resistance paths formed between an outer circumferential surface of the pistons and an inner circumferential surface of a piston chamber, to apply flow resistance to the liquid, and unidirectional flow paths formed along the respective pistons and configured to block the liquid flow toward the liquid storage chamber when the corresponding piston is pressed toward the piston chamber, but to permit the liquid to flow in the opposite direction.Type: ApplicationFiled: May 29, 2013Publication date: June 4, 2015Applicant: SMC CORPORATIONInventors: Eiko Miyasato, Youji Takakuwa, Kodai Yoshinaga, Tsuyoshi Mita, Kouichi Matsuzaki, Toshio Minakuchi, Kazuhiro Iida, Junya Kaneko
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Publication number: 20150145195Abstract: A clamp apparatus is equipped with a body, and a drive unit having a piston displaced under the supply of a pressure fluid. A clamp arm is disposed rotatably on the body. In addition, a piston rod of the drive unit is connected detachably with respect to a displaceable body of a driving force transmission mechanism which is disposed in the interior of the body. Upon detachment of a connector of the piston rod from a connecting recess of the displaceable body, the state of connection between the drive unit and the driving force transmission mechanism is released.Type: ApplicationFiled: June 17, 2013Publication date: May 28, 2015Applicant: SMC KABUSHIKI KAISHAInventors: Chiaki Fukui, Youji Takakuwa
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Patent number: 8857583Abstract: A hydraulic shock absorber that can reduce outflow amount of oil by maximally removing an oil film attached to an outer periphery of a rod and that can achieve securement of high slidability between the rod and a rod packing and prevention of wear of the rod packing. A rod packing interposed between an outer periphery of a rod and an inner periphery of a rod-side end wall includes a first lip for scrapping off an oil film attached to the outer periphery of the rod, and a ring-shaped grease holding member for supplying holding grease to the outer periphery of the rod. The grease holding member is in contact with the outer periphery of the rod at a position closer to a rod distal end than the first lip.Type: GrantFiled: December 1, 2010Date of Patent: October 14, 2014Assignee: SMC CorporationInventors: Eiko Miyasato, Akira Hiroki, Junya Kaneko, Youji Takakuwa, Kengo Monden, Masayuki Ishikawa, Mariko Kessoku
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Patent number: 8757338Abstract: Provided is a shock absorber enabling stable stop by damping at a terminal of a stroke and covering demanded impact-absorbing models. The shock absorber has a piston chamber, a start part for piston movement, a decelerating part, and an end part for stopping the piston. The start part forms a curve to provide a diameter larger than a virtual tapered surface formed within a stroke range of the piston and to be outward to a central axis of the piston chamber. In the decelerating part, a variation of diameter reduction is increased with the result that the diameter becomes smaller than the tapered surface, and a curve is formed so the change in variation of diameter reduction reaches the maximum variation point and turns negative. In the end part, the variation of diameter reduction is decreased with the result that a curve which enables piston stopping by damping is formed.Type: GrantFiled: March 12, 2012Date of Patent: June 24, 2014Assignee: SMC CorporationInventors: Eiko Miyasato, Masayuki Ishikawa, Tsuyoshi Mita, Akira Hiroki, Youji Takakuwa, Kouichi Matsuzaki, Toshio Minakuchi, Mariko Kessoku, Kodai Yoshinaga
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Publication number: 20130015027Abstract: A hydraulic shock absorber that can reduce outflow amount of oil by maximally removing an oil film attached to an outer periphery of a rod and that can achieve securement of high slidability between the rod and a rod packing and prevention of wear of the rod packing. A rod packing interposed between an outer periphery of a rod and an inner periphery of a rod-side end wall includes a first lip for scrapping off an oil film attached to the outer periphery of the rod, and a ring-shaped grease holding member for supplying holding grease to the outer periphery of the rod. The grease holding member is in contact with the outer periphery of the rod at a position closer to a rod distal end than the first lip.Type: ApplicationFiled: December 1, 2010Publication date: January 17, 2013Applicant: SMC CorporationInventors: Eiko Miyasato, Akira Hiroki, Junya Kaneko, Youji Takakuwa, Kengo Monden, Masayuki Ishikawa, Mariko Kessoku
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Publication number: 20120247891Abstract: Provided is a shock absorber enabling stable stop by damping at a terminal of a stroke and covering demanded impact-absorbing models. The shock absorber has a piston chamber, a start part for piston movement, a decelerating part, and an end part for stopping the piston. The start part forms a curve to provide a diameter larger than a virtual tapered surface formed within a stroke range of the piston and to be outward to a central axis of the piston chamber. In the decelerating part, a variation of diameter reduction is increased with the result that the diameter becomes smaller than the tapered surface, and a curve is formed so the change in variation of diameter reduction reaches the maximum variation point and turns negative. In the end part, the variation of diameter reduction is decreased with the result that a curve which enables piston stopping by damping is formed.Type: ApplicationFiled: March 12, 2012Publication date: October 4, 2012Applicant: SMC CORPORATIONInventors: Eiko MIYASATO, Masayuki Ishikawa, Tsuyoshi Mita, Akira Hiroki, Youji Takakuwa, Kouichi Matsuzaki, Toshio Minakuchi, Mariko Kessoku, Kodai Yoshinaga
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Patent number: D574758Type: GrantFiled: April 18, 2007Date of Patent: August 12, 2008Assignee: SMC CorporationInventors: Eiko Miyasato, Junya Kaneko, Youji Takakuwa, Kengo Monden, Soichi Sato, Masayuki Ishikawa
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Patent number: D499348Type: GrantFiled: September 4, 2003Date of Patent: December 7, 2004Assignee: SMC CorporationInventors: Takumi Matsumoto, Youji Takakuwa, Kengo Monden
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Patent number: D594929Type: GrantFiled: April 11, 2007Date of Patent: June 23, 2009Assignee: SMC CorporationInventors: Youji Takakuwa, Kengo Monden, Kazuhiro Noguchi
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Patent number: D594930Type: GrantFiled: April 11, 2007Date of Patent: June 23, 2009Assignee: SMC CorporationInventors: Youji Takakuwa, Kengo Monden, Kazuhiro Noguchi
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Patent number: D655314Type: GrantFiled: January 20, 2011Date of Patent: March 6, 2012Assignee: SMC CorporationInventors: Shinichi Yoshimura, Youji Takakuwa, Kengo Monden, Atsushi Fujiwara, Junji Itabashi
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Patent number: D683767Type: GrantFiled: January 20, 2011Date of Patent: June 4, 2013Assignee: SMC CorporationInventors: Shinichi Yoshimura, Youji Takakuwa, Kengo Monden, Atsushi Fujiwara, Junji Itabashi
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Patent number: D688123Type: GrantFiled: July 13, 2011Date of Patent: August 20, 2013Assignee: SMC Kabushiki KaishaInventors: Youji Takakuwa, Kengo Monden
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Patent number: D705030Type: GrantFiled: October 15, 2013Date of Patent: May 20, 2014Assignee: SMC CorporationInventors: Chiaki Fukui, Youji Takakuwa, Kenichi Takeda
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Patent number: D720977Type: GrantFiled: October 15, 2013Date of Patent: January 13, 2015Assignee: SMC CorporationInventors: Chiaki Fukui, Youji Takakuwa, Kenichi Takeda
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Patent number: D690191Type: GrantFiled: July 13, 2011Date of Patent: September 24, 2013Assignee: SMC Kabushiki KaishaInventors: Youji Takakuwa, Kengo Monden
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Patent number: D690192Type: GrantFiled: July 13, 2011Date of Patent: September 24, 2013Assignee: SMC Kabushiki KaishaInventors: Youji Takakuwa, Kengo Monden