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: 20210301839Abstract: A pressure-booster output stabilizer includes: a first cylinder having therein a first chamber and a second chamber separated by a first piston; a second cylinder having therein a third chamber and a fourth chamber separated by a second piston; and a piston rod configured to couple the first piston and the second piston. The primary pressure of a pressure booster is supplied to the first chamber, the secondary pressure of the pressure booster is supplied to the fourth chamber, and the pressurized fluid is taken out from the fourth chamber.Type: ApplicationFiled: March 24, 2021Publication date: September 30, 2021Applicant: SMC CORPORATIONInventors: Youji TAKAKUWA, Kazufumi WAKI
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Patent number: 11105350Abstract: A sensor mounting tool includes: a rail-shaped sensor holder having a first side wall in which a first connection hole is formed; a band part that has a first projection part, and that is formed to be wound on the outer peripheral surface of a cylinder tube; and a fastening mechanism that is for fastening the band part, and that is arranged at a position shifted away from the sensor holder on the outer peripheral surface of the cylinder tube.Type: GrantFiled: October 5, 2016Date of Patent: August 31, 2021Assignee: SMC CORPORATIONInventors: Youji Takakuwa, Mitsuru Machijima, Shiori Iwatsuki, Kenta Onuki
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Publication number: 20210108657Abstract: A fluid circuit for air cylinders is provided with a switching valve, an air supply source, an exhaust port and a check valve. When the switching valve is in a first position, one cylinder chamber is connected with the air supply source and the other cylinder chamber is connected with the exhaust port. When the switching valve is in a second position, the one cylinder chamber is connected with the other cylinder chamber via the check valve, and the one cylinder chamber is connected with the exhaust port. The acoustic velocity conductance of a pipe connecting the switching valve and a cylinder port part of the one cylinder chamber is lower than the acoustic velocity conductance of the switching valve and the cylinder port part of the one cylinder chamber.Type: ApplicationFiled: May 18, 2018Publication date: April 15, 2021Applicant: SMC CORPORATIONInventors: Yoshiyuki TAKADA, Youji TAKAKUWA, Hiroyuki ASAHARA, Kengo MONDEN, Kazutaka SOMEYA
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Patent number: 10927857Abstract: A fluid pressure cylinder driving device includes a switch valve, a high pressure air supply source, an exhaust port and a check valve. When the switch valve is at a first position, a head side cylinder chamber communicates with the high pressure air supply source, and a rod side cylinder chamber communicates with the exhaust port. When the switch valve is at a second position, the head side cylinder chamber communicates with the rod side cylinder chamber via the check valve, and the head side cylinder chamber communicates with the exhaust port.Type: GrantFiled: September 4, 2017Date of Patent: February 23, 2021Assignee: SMC CORPORATIONInventors: Youji Takakuwa, Hiroyuki Asahara, Kengo Monden, Aki Iwamoto, Naoki Shinjo, Kazutaka Someya, Akihiro Kazama
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Patent number: 10883523Abstract: A cylinder main body of a fluid pressure cylinder includes a switch valve, a check valve, and a flow path communicating a high pressure air supply source with a head side cylinder chamber and communicating an exhaust port with a rod side cylinder chamber when the switch valve is at a second position. Another flow path communicates the head side cylinder chamber with the rod side cylinder chamber and the exhaust port when the switch valve is at the first position.Type: GrantFiled: September 4, 2017Date of Patent: January 5, 2021Assignee: SMC CORPORATIONInventors: Youji Takakuwa, Hiroyuki Asahara, Kengo Monden, Aki Iwamoto, Naoki Shinjo, Kazutaka Someya, Akihiro Kazama
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Publication number: 20200025224Abstract: A cylinder main body of a fluid pressure cylinder includes a switch valve, a check valve, and a flow path communicating a high pressure air supply source with a head side cylinder chamber and communicating an exhaust port with a rod side cylinder chamber when the switch valve is at a second position. Another flow path communicates the head side cylinder chamber with the rod side cylinder chamber and the exhaust port when the switch valve is at the first position.Type: ApplicationFiled: September 4, 2017Publication date: January 23, 2020Applicant: SMC CORPORATIONInventors: Youji TAKAKUWA, Hiroyuki ASAHARA, Kengo MONDEN, Aki IWAMOTO, Naoki SHINJO, Kazutaka SOMEYA, Akihiro KAZAMA
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Publication number: 20190277310Abstract: A fluid pressure cylinder driving device includes a switch valve, a high pressure air supply source, an exhaust port and a check valve. When the switch valve is at a first position, a head side cylinder chamber communicates with the high pressure air supply source, and a rod side cylinder chamber communicates with the exhaust port. When the switch valve is at a second position, the head side cylinder chamber communicates with the rod side cylinder chamber via the check valve, and the head side cylinder chamber communicates with the exhaust port.Type: ApplicationFiled: September 4, 2017Publication date: September 12, 2019Applicant: SMC CORPORATIONInventors: Youji TAKAKUWA, Hiroyuki ASAHARA, Kengo MONDEN, Aki IWAMOTO, Naoki SHINJO, Kazutaka SOMEYA, Akihiro KAZAMA
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Patent number: 10138914Abstract: A sensor attachment tool is provided with a rail-shaped sensor holder having a sensor insertion groove for accommodatably holding a position sensor so that the position of the position sensor can be adjusted, a band part linkable at both ends to the sensor holder and configured so as to be fitted over the outer peripheral surface of a cylinder tube along the peripheral direction, and a tightening mechanism for tightening the band part, the tightening mechanism being arranged on the outer peripheral surface of the cylinder tube in a different peripheral position than the sensor holder.Type: GrantFiled: February 29, 2016Date of Patent: November 27, 2018Assignee: SMC CORPORATIONInventors: Youji Takakuwa, Mitsuru Machijima
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Publication number: 20180283417Abstract: A sensor mounting tool includes: a rail-shaped sensor holder having a first side wall in which a first connection hole is formed; a band part that has a first projection part, and that is formed to be wound on the outer peripheral surface of a cylinder tube; and a fastening mechanism that is for fastening the band part, and that is arranged at a position shifted away from the sensor holder on the outer peripheral surface of the cylinder tube.Type: ApplicationFiled: October 5, 2016Publication date: October 4, 2018Applicant: SMC CORPORATIONInventors: Youji TAKAKUWA, Mitsuru MACHIJIMA, Shiori IWATSUKI, Kenta ONUKI
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Patent number: 10041514Abstract: 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: GrantFiled: December 20, 2012Date of Patent: August 7, 2018Assignee: SMC KABUSHIKI KAISHAInventor: Youji Takakuwa
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Publication number: 20180112689Abstract: A sensor attachment tool is provided with a rail-shaped sensor holder having a sensor insertion groove for accommodatably holding a position sensor so that the position of the position sensor can be adjusted, a band part linkable at both ends to the sensor holder and configured so as to be fitted over the outer peripheral surface of a cylinder tube along the peripheral direction, and a tightening mechanism for tightening the band part, the tightening mechanism being arranged on the outer peripheral surface of the cylinder tube in a different peripheral position than the sensor holder.Type: ApplicationFiled: February 29, 2016Publication date: April 26, 2018Applicant: SMC CORPORATIONInventors: Youji TAKAKUWA, Mitsuru MACHIJIMA
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Patent number: 9909639Abstract: A shock absorber includes a cylinder housing including a piston chamber in which oily liquid is disposed, a piston movable in the piston chamber, a rod connected to the piston and protruding out from the cylinder housing, and a return mechanism for the rod. In the shock absorber, a cylindrical bearing made of a synthetic resin having a shock-absorbing property, a dust collecting member for avoiding entry of dust particles, and a lubricating member for supplying a lubricating oil to a surface of the rod are disposed in a rod guiding hole in the cylinder housing. A leading end of the bearing protrudes outside with respect to an outer end surface of the cylinder housing and acts as a contact portion that allows a moving object to come into contact therewith, and thus the bearing functions to guide the rod and also functions as a stopper for avoiding the moving object from coming into contact with the outer end surface of the cylinder housing.Type: GrantFiled: March 20, 2014Date of Patent: March 6, 2018Assignee: SMC CORPORATIONInventors: Eiko Miyasato, Tsuyoshi Mita, Kodai Yoshinaga, Youji Takakuwa, Junya Kaneko
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Patent number: 9677639Abstract: 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: GrantFiled: May 29, 2013Date of Patent: June 13, 2017Assignee: SMC CORPORATIONInventors: Eiko Miyasato, Youji Takakuwa, Kodai Yoshinaga, Tsuyoshi Mita, Kouichi Matsuzaki, Toshio Minakuchi, Kazuhiro Iida, Junya Kaneko
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Publication number: 20160369863Abstract: A shock absorber includes a cylinder housing including a piston chamber in which oily liquid is disposed, a piston movable in the piston chamber, a rod connected to the piston and protruding out from the cylinder housing, and a return mechanism for the rod. In the shock absorber, a cylindrical bearing made of a synthetic resin having a shock-absorbing property, a dust collecting member for avoiding entry of dust particles, and a lubricating member for supplying a lubricating oil to a surface of the rod are disposed in a rod guiding hole in the cylinder housing. A leading end of the bearing protrudes outside with respect to an outer end surface of the cylinder housing and acts as a contact portion that allows a moving object to come into contact therewith, and thus the bearing functions to guide the rod and also functions as a stopper for avoiding the moving object from coming into contact with the outer end surface of the cylinder housing.Type: ApplicationFiled: March 20, 2014Publication date: December 22, 2016Applicant: SMC CORPORATIONInventors: Eiko MIYASATO, Tsuyoshi MITA, Kodai YOSHINAGA, Youji TAKAKUWA, Junya KANEKO
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Patent number: 9409282Abstract: 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: GrantFiled: June 17, 2013Date of Patent: August 9, 2016Assignee: SMC KABUSHIKI KAISHAInventors: Chiaki Fukui, Youji Takakuwa
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Patent number: 9366306Abstract: 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: GrantFiled: May 29, 2013Date of Patent: June 14, 2016Assignee: SMC CORPORATIONInventors: Eiko Miyasato, Youji Takakuwa, Akira Hiroki, Kouichi Matsuzaki, Toshio Minakuchi, Kodai Yoshinaga, Tsuyoshi Mita, Mariko Kessoku
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Patent number: D782928Type: GrantFiled: March 30, 2016Date of Patent: April 4, 2017Assignee: SMC CorporationInventors: Youji Takakuwa, Mitsuru Machijima, Kengo Monden, Seiichi Nagura, Kenta Onuki
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Patent number: D782929Type: GrantFiled: March 30, 2016Date of Patent: April 4, 2017Assignee: SMC CorporationInventors: Youji Takakuwa, Mitsuru Machijima, Kengo Monden, Seiichi Nagura, Kenta Onuki
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Patent number: D782930Type: GrantFiled: March 30, 2016Date of Patent: April 4, 2017Assignee: SMC CorporationInventors: Youji Takakuwa, Mitsuru Machijima, Kengo Monden, Seiichi Nagura, Kenta Onuki
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Patent number: D782931Type: GrantFiled: March 30, 2016Date of Patent: April 4, 2017Assignee: SMC CorporationInventors: Youji Takakuwa, Mitsuru Machijima, Kengo Monden, Seiichi Nagura, Kenta Onuki