Patents by Inventor Ritsu Yamamoto
Ritsu Yamamoto 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: 9640354Abstract: In a contact device, rotational movement of a movable contactor with a yoke attached is regulated by the fact that the yoke abuts against a wall surface of a wall portion. In an event where the movable contactor with the yoke attached moves rotationally, the yoke is allowed to abut against only a wall surface in one region obtained by dividing the wall surface by a virtual line passing through a rotation center of the yoke.Type: GrantFiled: August 20, 2013Date of Patent: May 2, 2017Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Tsukasa Nishimura, Ritsu Yamamoto
-
Patent number: 9640355Abstract: A contact apparatus is provided and includes fixed terminals having fixed contacts, a movable contact member having the movable contacts provided on one surface thereof so as to come into contact or out of contact with the fixed contacts, a first yoke arranged at one side of said one surface of the movable contact member, and a second yoke arranged at a side of the other surface of the movable contact member, the second yoke having one surface facing the first yoke through the movable contact member. The first yoke is larger in volume than the second yoke.Type: GrantFiled: May 18, 2015Date of Patent: May 2, 2017Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Hideki Enomoto, Ritsu Yamamoto, Yoshihisa Fukuda, Yohji Ikeda, Ryosuke Ozaki
-
Patent number: 9443685Abstract: Provided is a contact device in which all of three movable contacts can be securely brought into contact with fixed contacts. The contact device includes a fixed terminal 37 that has a fixed contact 35, a movable terminal 28 that moves toward and away from the fixed terminal 37 and has three movable contacts 31a, 31b, and 31c that are brought into contact with the fixed contact 35, and a pressing spring 33 that presses the movable terminal 28 and brings the movable contacts 31a, 31b, and 31c into contact with the fixed contacts 35 at a predetermined pressing force. The point of application of the pressing spring 33 is located in a triangle formed by internal tangents of the three movable contacts.Type: GrantFiled: May 22, 2015Date of Patent: September 13, 2016Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Ritsu Yamamoto, Tsukasa Nishimura
-
Patent number: 9269507Abstract: A contact device includes: fixed terminals; a movable contact maker; a pressing spring; an adjustment plate that comes into contact with an upper face of the movable contact maker; a holding portion; a movable shaft; and an electromagnet block. The holding portion is divided into first and second holding portions that are separated from each other. The first and second holding portions are electrically connected to each other via only the adjustment plate, due to the adjustment plate being sandwiched by a first side plate of the first holding portion and a second side plate of the second holding portion. The adjustment plate is moved in extending and contracting directions of the pressing spring, and the adjustment plate and each of the first and second side plates are subjected to resistance welding at a position at which pressing force of the pressing spring is a predetermined value.Type: GrantFiled: April 8, 2013Date of Patent: February 23, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Hideki Enomoto, Hirokazu Asakura, Tetsuya Yamada, Ritsu Yamamoto, Naoki Seki, Toshiyuki Shima, Naoki Inadomi, Yoji Ikeda
-
Publication number: 20150279601Abstract: Provided is a contact device in which all of three movable contacts can be securely brought into contact with fixed contacts. The contact device includes a fixed terminal 37 that has a fixed contact 35, a movable terminal 28 that moves toward and away from the fixed terminal 37 and has three movable contacts 31a, 31b, and 31c that are brought into contact with the fixed contact 35, and a pressing spring 33 that presses the movable terminal 28 and brings the movable contacts 31a, 31b, and 31c into contact with the fixed contacts 35 at a predetermined pressing force. The point of application of the pressing spring 33 is located in a triangle formed by internal tangents of the three movable contacts.Type: ApplicationFiled: May 22, 2015Publication date: October 1, 2015Inventors: Ritsu YAMAMOTO, Tsukasa NISHIMURA
-
Publication number: 20150255236Abstract: A contact apparatus is provided and includes fixed terminals having fixed contacts, a movable contact member having the movable contacts provided on one surface thereof so as to come into contact or out of contact with the fixed contacts, a first yoke arranged at one side of said one surface of the movable contact member, and a second yoke arranged at a side of the other surface of the movable contact member, the second yoke having one surface facing the first yoke through the movable contact member. The first yoke is larger in volume than the second yoke.Type: ApplicationFiled: May 18, 2015Publication date: September 10, 2015Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Hideki ENOMOTO, Ritsu YAMAMOTO, Yoshihisa FUKUDA, Yohji IKEDA, Ryosuke OZAKI
-
Publication number: 20150255235Abstract: In a contact device, rotational movement of a movable contactor with a yoke attached is regulated by the fact that the yoke abuts against a wall surface of a wall portion. In an event where the movable contactor with the yoke attached moves rotationally, the yoke is allowed to abut against only a wall surface in one region obtained by dividing the wall surface by a virtual line passing through a rotation center of the yoke.Type: ApplicationFiled: August 20, 2013Publication date: September 10, 2015Inventors: Tsukasa Nishimura, Ritsu Yamamoto
-
Patent number: 9064664Abstract: Provided is a contact device in which all of three movable contacts can be securely brought into contact with fixed contacts. The contact device includes a fixed terminal 37 that has a fixed contact 35, a movable terminal 28 that moves toward and away from the fixed terminal 37 and has three movable contacts 31a, 31b, and 31c that are brought into contact with the fixed contact 35, and a pressing spring 33 that presses the movable terminal 28 and brings the movable contacts 31a, 31b, and 31c into contact with the fixed contacts 35 at a predetermined pressing force. The point of application of the pressing spring 33 is located in a triangle formed by internal tangents of the three movable contacts.Type: GrantFiled: March 9, 2012Date of Patent: June 23, 2015Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Ritsu Yamamoto, Tsukasa Nishimura
-
Publication number: 20150077202Abstract: A contact device includes: fixed terminals; a movable contact maker; a pressing spring; an adjustment plate that comes into contact with an upper face of the movable contact maker; a holding; a movable shaft; and an electromagnet block. The holding portion is divided into first and second holding portions that are separated from each other. The first and second holding portions are electrically connected to each other via only the adjustment plate, due to the adjustment plate being sandwiched by a first side plate of the first holding portion and a second side plate of the second holding portion. The adjustment plate is moved in extending and contracting directions of the pressing spring, and the adjustment plate and each of the first and second side plates are subjected to resistance welding at a position at which pressing force of the pressing spring is a predetermined value.Type: ApplicationFiled: April 8, 2013Publication date: March 19, 2015Inventors: Hideki Enomoto, Hirokazu Asakura, Tetsuya Yamada, Ritsu Yamamoto, Naoki Seki, Toshiyuki Shima, Naoki Inadomi, Yoji Ikeda
-
Publication number: 20130342293Abstract: Provided is a contact device in which all of three movable contacts can be securely brought into contact with fixed contacts. The contact device includes a fixed terminal 37 that has a fixed contact 35, a movable terminal 28 that moves toward and away from the fixed terminal 37 and has three movable contacts 31a, 31b, and 31c that are brought into contact with the fixed contact 35, and a pressing spring 33 that presses the movable terminal 28 and brings the movable contacts 31a, 31b, and 31c into contact with the fixed contacts 35 at a predetermined pressing force. The point of application of the pressing spring 33 is located in a triangle formed by internal tangents of the three movable contacts.Type: ApplicationFiled: March 9, 2012Publication date: December 26, 2013Applicant: PANASONIC CORPORATIONInventors: Ritsu Yamamoto, Tsukasa Nishimura
-
Patent number: 8448814Abstract: Fit structure of a housing formed of first and second halves is provided. The first half has a fit projection piece having a fit tongue at the tip. The second half has a presser part and an engaging piece constituting a fit groove. The fit projection piece, presser part and engaging piece are formed so that the fit tongue is positioned in the inner part of the fit groove along the root of the presser part. The housing further has a nail stuck out in an inward or outward direction of the housing and a nail holder engaged with the nail. The nail and nail holder are located at one and the other of a part of the fit projection piece and a corresponding part of the engaging piece. The part of the fit projection piece is nearer to the root of the fit projection piece than the fit tongue.Type: GrantFiled: October 11, 2007Date of Patent: May 28, 2013Assignee: Panasonic CorporationInventors: Ritsu Yamamoto, Masahiro Ito, Motoharu Kubo
-
Patent number: 8395463Abstract: A sealed receptacle includes a case, a cylindrical member, and a closure plate. The sealed receptacle is configured to house a fixed contact, a movable contact, and an arc protection member. The arc protection member includes a peripheral wall, and a bottom. The peripheral wall is configured to conceal a junction between the case and the cylindrical member from the fixed contact and the movable contact. The bottom is interposed between the movable contact and the closure plate. The sealed receptacle houses a contact pressure provision member configured to bias the movable contact to come into contact with the fixed contact. The contact pressure provision member is interposed between the movable contact and the bottom so as to come into resilient contact with both the movable contact and the bottom irrespective of a position of the movable contact.Type: GrantFiled: March 16, 2009Date of Patent: March 12, 2013Assignee: Panasonic CorporationInventors: Masahiro Ito, Ritsu Yamamoto, Motoharu Kubo, Tsukasa Nishimura
-
Publication number: 20110032059Abstract: A sealed receptacle includes a case, a cylindrical member, and a closure plate. The sealed receptacle is configured to house a fixed contact, a movable contact, and an arc protection member. The arc protection member includes a peripheral wall, and a bottom. The peripheral wall is configured to conceal a junction between the case and the cylindrical member from the fixed contact and the movable contact. The bottom is interposed between the movable contact and the closure plate. The sealed receptacle houses a contact pressure provision member configured to bias the movable contact to come into contact with the fixed contact. The contact pressure provision member is interposed between the movable contact and the bottom so as to come into resilient contact with both the movable contact and the bottom irrespective of a position of the movable contact.Type: ApplicationFiled: March 16, 2009Publication date: February 10, 2011Inventors: Masahiro Ito, Ritsu Yamamoto, Motoharu Kubo, Tsukasa Nishimura
-
Patent number: 7876183Abstract: This electromagnetic switching device comprises an electromagnetic device 1 in which a movable core 15 comes into contact with or separates from a fixed core 14 in response to energization of an excitation coil 11 wound around a coil bobbin 10 a contact device 2 with a fixed contact 21 and a movable contact which comes into contact with or separates from the fixed contact in conjunction with a movement of the movable core 15 of the electromagnetic device, and a boxy case 3 configured to house the electromagnetic device and the contact device.Type: GrantFiled: November 21, 2006Date of Patent: January 25, 2011Assignee: Panasonic Electric Works Co., Ltd.Inventors: Katsuya Uruma, Masahiro Itou, Motoharu Kubo, Ritsu Yamamoto, Riichi Uotome
-
Patent number: 7859373Abstract: A contact device including a pair of fixed terminals 2 with a fixed contact 2a each, a movable armature 3 with movable contacts 3a which contact to or separate from the fixed contacts 2a, a movable shaft 4 connected to the movable armature 3 at its one end, a movable core 8 secured to the opposite end 4b side of the movable shaft 4, a movable core receiver 7 slid onto the movable shaft 4 so that it faces a surface 8b on the movable armature side of the movable core 3 to receive the movable core 8 driven by an electromagnetic mechanism, an impact absorber 17 disposed on a surface 7a on the movable armature side of the movable core receiver 7 to absorb an impact generated when the movable core 3 hit the movable core receiver 7, and a stopper 16 (a movement restriction member) disposed on a surface on the movable armature side of the impact absorber 17 to restrict a movement of the impact absorber 17.Type: GrantFiled: March 27, 2006Date of Patent: December 28, 2010Assignee: Panasonic Electric Works Co., Ltd.Inventors: Ritsu Yamamoto, Riichi Uotome, Katsuya Uruma, Masahiro Ito, Motoharu Kubo
-
Publication number: 20100270305Abstract: Fit structure of a housing formed of first and second halves is provided. The first half has a fit projection piece having a fit tongue at the tip. The second half has a presser part and an engaging piece constituting a fit groove. The fit projection piece, presser part and engaging piece are formed so that the fit tongue is positioned in the inner part of the fit groove along the root of the presser part. The housing further has a nail stuck out in an inward or outward direction of the housing and a nail holder engaged with the nail. The nail and nail holder are located at one and the other of a part of the fit projection piece and a corresponding part of the engaging piece. The part of the fit projection piece is nearer to the root of the fit projection piece than the fit tongue.Type: ApplicationFiled: October 11, 2007Publication date: October 28, 2010Applicant: Panasonic Electric Works Co., Ltd.Inventors: Ritsu Yamamoto, Masahiro Ito, Motoharu Kubo
-
Publication number: 20090243771Abstract: This electromagnetic switching device comprises an electromagnetic device 1 in which a movable core 15 comes into contact with or separates from a fixed core 14 in response to energization of an excitation coil 11 wound around a coil bobbin 10, a contact device 2 with a fixed contact 21 and a movable contact which comes into contact with or separates from the fixed contact in conjunction with a movement of the movable core 15 of the electromagnetic device, and a boxy case 3 configured to house the electromagnetic device and the contact device.Type: ApplicationFiled: November 21, 2006Publication date: October 1, 2009Applicant: MATSUSHITA ELECTRIC WORKS, LTDInventors: Katsuya Uruma, Masahiro Itou, Motoharu Kubo, Ritsu Yamamoto, Riichi Uotome
-
Publication number: 20070241847Abstract: This contact device comprises a pair of fixed terminals 2 with a fixed contact 2a each, a movable armature 3 with movable contacts 3a which contact to or separate from the fixed contacts 2a, a movable shaft 4 connected to the movable armature 3 at its one end, a movable core 8 secured to the opposite end 4b side of the movable shaft 4, a movable core receiver 7 slid onto the movable shaft 4 so that it faces a surface 8b on the movable armature side of the movable core 3 to receive the movable core 8 driven by an electromagnetic mechanism, an impact absorber 17 disposed on a surface 7a on the movable armature side of the movable core receiver 7 to absorb an impact generated when the movable core 3 hit the movable core receiver 7, and a stopper 16 (a movement restriction member) disposed on a surface on the movable armature side of the impact absorber 17 to restrict a movement of the impact absorber 17.Type: ApplicationFiled: March 27, 2006Publication date: October 18, 2007Inventors: Ritsu Yamamoto, Riichi Uotome, Katsuya Uruma, Masahiro Ito, Motoharu Kubo
-
Patent number: 7046107Abstract: Each movable contact 15 is given a first force by a drive mechanism along a direction for bringing the movable contact into contact with a fixed contact 5 and given a second force through a leg 14b by deformation of a supporting member 14c resulted from an overtravel of the movable plate 14. The fixed contact and the movable contact are arranged such that a resultant force of the first and the second forces acts in a direction normal to a contact surface defined between the fixed contacts and the movable contacts. So, a component force of the resultant force parallel to the contact surface is not generated, therefore, a side slip of the movable contact can be prevented when the contacts are opened or closed.Type: GrantFiled: February 27, 2004Date of Patent: May 16, 2006Assignee: Matsushita Electric Works, Ltd.Inventors: Ritsu Yamamoto, Riichi Uotome, Kouji Yokoyama
-
Publication number: 20050190025Abstract: Each movable contact 15 is given a first force by a drive mechanism along a direction for bringing the movable contact into contact with a fixed contact 5 and given a second force through a leg 14b by deformation of a supporting member 14c resulted from an overtravel of the movable plate 14. The fixed contact and the movable contact are arranged such that a resultant force of the first and the second forces acts in a direction normal to a contact surface defined between the fixed contacts and the movable contacts. So, a component force of the resultant force parallel to the contact surface is not generated, therefore, a side slip of the movable contact can be prevented when the contacts are opened or closed.Type: ApplicationFiled: February 27, 2004Publication date: September 1, 2005Inventors: Ritsu Yamamoto, Riichi Uotome, Kouji Yokoyama