Patents by Inventor Tsutomu Togashi

Tsutomu Togashi 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: 10274061
    Abstract: Provided is a ball screw capable of reducing unevenness of load distribution of balls and extending a service life of the ball screw. In the ball screw, one end part 6 of a nut 2 on a flange 2-2 side is closer to an end 9 of a screw shaft 1 on a fixed side than the other end part 7 of the nut 2 on a side opposite the flange 2-2 is, two or more circulation paths 5a to 5c are arranged in an axial direction of the nut 2, and a diameter of a ball 3a in the circulation path 5a closest to the flange 2-2 of the nut 2 is smaller than a diameter of a ball 3c in the circulation path 5c remotest from the flange 2-2 of the nut 2.
    Type: Grant
    Filed: December 25, 2015
    Date of Patent: April 30, 2019
    Assignee: THK CO., LTD.
    Inventors: Kenji Fujii, Masahiko Yoshino, Tsutomu Togashi
  • Patent number: 10066716
    Abstract: A disclosed screw device provides an allowance for the accuracy of a recess in an end surface of a nut. A nut has a communicating hole communicating in an axial direction, and is provided at an axial end surface of the nut with a recess communicating with the communicating hole. A circulation member including a turn-around path is placed in the recess. When the circulation member is placed in the recess, the turn-around path of the circulation member is linked to a loaded rolling element rolling groove and the communicating hole of the nut to form a circulation path of a rolling element. A clearance between the circulation member and a wall surface of the recess permits the circulation member to move. The circulation member placed in the recess is not fixed in the recess, and is covered with a lid member to be attached to the nut.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: September 4, 2018
    Assignee: THK CO., LTD.
    Inventors: Futoshi Nakamura, Tetsuhiro Nishide, Yuji Kubota, Tsutomu Togashi
  • Publication number: 20170370454
    Abstract: A disclosed screw device provides an allowance for the accuracy of a recess in an end surface of a nut. A nut has a communicating hole communicating in an axial direction, and is provided at an axial end surface of the nut with a recess communicating with the communicating hole. A circulation member including a turn-around path is placed in the recess. When the circulation member is placed in the recess, the turn-around path of the circulation member is linked to a loaded rolling element rolling groove and the communicating hole of the nut to form a circulation path of a rolling element. A clearance between the circulation member and a wall surface of the recess permits the circulation member to move. The circulation member placed in the recess is not fixed in the recess, and is covered with a lid member to be attached to the nut.
    Type: Application
    Filed: January 27, 2016
    Publication date: December 28, 2017
    Inventors: Futoshi NAKAMURA, Tetsuhiro NISHIDE, Yuji KUBOTA, Tsutomu TOGASHI
  • Publication number: 20170335933
    Abstract: Provided is a ball screw capable of reducing unevenness of load distribution of balls and extending a service life of the ball screw. In the ball screw, one end part 6 of a nut 2 on a flange 2-2 side is closer to an end 9 of a screw shaft 1 on a fixed side than the other end part 7 of the nut 2 on a side opposite the flange 2-2 is, two or more circulation paths 5a to 5c are arranged in an axial direction of the nut 2, and a diameter of a ball 3a in the circulation path 5a closest to the flange 2-2 of the nut 2 is smaller than a diameter of a ball 3c in the circulation path 5c remotest from the flange 2-2 of the nut 2.
    Type: Application
    Filed: December 25, 2015
    Publication date: November 23, 2017
    Applicant: THK CO., LTD.
    Inventors: Kenji FUJII, Masahiko YOSHINO, Tsutomu TOGASHI
  • Patent number: 9664268
    Abstract: A ball screw device includes a ball circulation part having a ball circulation path. The ball circulation part is formed by combining a first split body and a second split body. The first split body has a fixing section fixed to an outer surface of a nut member. The second split body has a pair of leg sections configured to scoop up balls moving along a ball load rolling path and return the balls to the ball load rolling path, a connecting section configured to connect the pair of leg sections and disposed between the first split body and the nut member, and a pair of shoulder sections facing side surfaces of the first split body in two directions so as to sandwich the first split body between the pair of shoulder sections.
    Type: Grant
    Filed: February 15, 2015
    Date of Patent: May 30, 2017
    Assignee: THK CO., LTD.
    Inventors: Tsutomu Togashi, Hideo Saito, Eri Kameda
  • Patent number: 9506544
    Abstract: A ball screw device or linear motion guide device has a seal member preventing dust and dirt from entering into a movable member of a linear motion guide device and seals out fine dust, dirt or like by surely contacting a seal to a shaft member without providing a large margin to the seal. The seal member includes a body portion mounted to the movable member and a lip portion contacting an outer portion of the shaft member, the lip portion has an oblique surface having an axial section inclining with respect to its axial direction, the body portion has an urging member urging the lip portion in a diameter direction of the shaft member and a reinforcing portion reinforcing the body portion. The urging member is located on the reinforcing portion side than the tip end of the lip portion in the axial sectional shape of the lip portion.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: November 29, 2016
    Assignee: THK CO., LTD.
    Inventors: Katsuya Iida, Soshi Miyahara, Hideo Saito, Toshiaki Kadono, Masahiko Yoshino, Tsutomu Togashi, Eri Kameda, Futoshi Nakamura
  • Publication number: 20160333995
    Abstract: A ball screw device includes a ball circulation part having a bail circulation path. The ball circulation part is formed by combining a first split body and a second split body. The first split body has a fixing section fixed to an outer surface of a nut member. The second split body has a pair of leg sections configured to scoop up balls moving along a ball load rolling path and return the balls to the ball load rolling path, a connecting section configured to connect the pair of leg sections and disposed between the first split body and the nut member, and a pair of shoulder sections facing side surfaces of the first split body in two directions so as to sandwich the first split body between the pair of shoulder sections.
    Type: Application
    Filed: February 15, 2015
    Publication date: November 17, 2016
    Applicant: THK CO., LTD.
    Inventors: Tsutomu TOGASHI, Hideo SAITO, Eri KAMEDA
  • Publication number: 20130255419
    Abstract: A ball screw device or linear motion guide device has a seal member preventing dust and dirt from entering into a movable member of a linear motion guide device and seals out fine dust, dirt or like by surely contacting a seal to a shaft member without providing a large margin to the seal. The seal member includes a body portion mounted to the movable member and a lip portion contacting an outer portion of the shaft member, the lip portion has an oblique surface having an axial section inclining with respect to its axial direction, the body portion has an urging member urging the lip portion in a diameter direction of the shaft member and a reinforcing portion reinforcing the body portion. The urging member is located on the reinforcing portion side than the tip end of the lip portion in the axial sectional shape of the lip portion.
    Type: Application
    Filed: December 9, 2011
    Publication date: October 3, 2013
    Applicant: THK Co., Ltd.
    Inventors: Katsuya Iida, Soshi Miyahara, Hideo Saito, Toshiaki Kadono, Masahiko Yoshino, Tsutomu Togashi, Eri Kameda, Futoshi Nakamura
  • Patent number: 8375815
    Abstract: A rolling-element screw device includes: a large number of rolling elements; a screw shaft having an outer periphery on which a rolling groove for the large number of rolling elements is helically formed; a nut member which has a through-hole through which the screw shaft is passed and which is threadedly engaged with the screw shaft through intermediation of the large number of rolling elements; a lubricant supply hole formed through the nut member from an outer peripheral surface of the nut member to an inner peripheral surface of the nut member; a lubricant tank mounted to the outer peripheral surface of the nut member and comprising an accommodating chamber for lubricant; and a lubricant applying body standing from the lubricant tank, and inserted into the lubricant supply hole along with amounting operation of the lubricant tank with respect to the nut member.
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: February 19, 2013
    Assignee: THK Co., Ltd.
    Inventors: Soshi Miyahara, Hideo Saito, Toshiaki Kadono, Masahiko Yoshino, Takashi Sakuyama, Tsutomu Togashi, Kazuhiro Tani, Eri Kameda, Futoshi Nakamura
  • Patent number: 8336415
    Abstract: Provided is a roller screw capable of preventing rollers moving from an unloaded return path to a loaded roller rolling path from coming into collision with a scooping portion. The roller screw has: a screw shaft 1 having a spiral roller rolling surface 1a formed on an outer peripheral surface thereof; a nut 2 having a loaded roller rolling surface 2a formed in an inner peripheral surface thereof; a circulation member 3 having an unloaded return path connecting one end of the loaded roller rolling surface 2a of the nut 2 to an opposite end thereof; and a plurality of rollers 4 arranged in a loaded roller rolling path 6 and the unloaded return path.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: December 25, 2012
    Assignee: THK Co., Ltd.
    Inventors: Soshi Miyahara, Masahiko Yoshino, Lina Teng, Tsutomu Togashi, Takashi Sakuyama, Kentaro Nishimura, Tetsuya Miura, Akimasa Yoshida, Yusuke Todoroki
  • Patent number: 8261627
    Abstract: There is provided a new rolling body screw device manufactured with cheap cost without degrading quality in comparison with a conventional device even for a device having any large dimension in an end-cap type rolling body screw device. The rolling body screw device includes the direction changing passages 42 each including: a scoop-up portion 43 scooping a ball rolling in a loaded rolling body passage as a loaded area of the endless track so as to hand over the balls to the direction changing passage 42 as a non-loaded area of the endless track; and a route path 44 forming a circulation path of the ball scooped by the scoop-up portion. Each of the return pieces is composed, in combination, of a metal part 41a formed of a metal material including the scoop-up portion 43, and non-metal parts 41b, 41c formed of a non-metal material including the route path 44.
    Type: Grant
    Filed: October 7, 2008
    Date of Patent: September 11, 2012
    Assignee: THK Co., Ltd.
    Inventors: Soshi Miyahara, Toshiaki Kadono, Masahiko Yoshino, Takashi Sakuyama, Lina Teng, Tsutomu Togashi, Kazuhiro Tani
  • Patent number: 8132477
    Abstract: A ball screw device having a novel ball circulation structure suitable for a screw shaft with a large lead, optimum for downsizing and weight saving of a nut member, capable of being manufactured at low cost, and capable of exhibiting high reliability even under severe use conditions. In a ball screw device where a screw shaft and a nut member are screwed to each other through an intermediation of a large number of balls, a no-load ball path which forms an infinite circulation path for the balls is constituted by a no-load ball groove spirally formed in an inner peripheral surface of a through-hole of the nut member and by a pair of direction change grooves which communicatively couple a load rolling groove and the no-load ball groove to each other so as to complete the infinite circulation path as a closed loop.
    Type: Grant
    Filed: March 19, 2007
    Date of Patent: March 13, 2012
    Assignee: THK Co., Ltd.
    Inventors: Takeki Shirai, Yuji Tachikake, Soshi Miyahara, Masahiko Yoshino, Takashi Sakuyama, Lina Teng, Tsutomu Togashi
  • Publication number: 20120017713
    Abstract: Provided is a rolling-element screw device which does not sacrifice a stroke distance of a nut member (2) although carrying a sufficient amount of lubricant, or hinder heat radiation of the nut member (2), and contributes to facilitation of a replacement operation of a lubricant tank (4).
    Type: Application
    Filed: April 9, 2010
    Publication date: January 26, 2012
    Applicant: THK CO., LTD.
    Inventors: Soshi Miyahara, Hideo Saito, Toshiaki Kadono, Masahiko Yoshino, Takashi Sakuyama, Tsutomu Togashi, Kazuhiro Tani, Eri Kameda, Futoshi Nakamura
  • Publication number: 20100263467
    Abstract: Provided is a roller screw capable of preventing rollers moving from an unloaded return path to a loaded roller rolling path from coming into collision with a scooping portion. The roller screw has: a screw shaft 1 having a spiral roller rolling surface la formed on an outer peripheral surface thereof; a nut 2 having a loaded roller rolling surface 2a formed in an inner peripheral surface thereof; a circulation member 3 having an unloaded return path connecting one end of the loaded roller rolling surface 2a of the nut 2 to an opposite end thereof; and a plurality of rollers 4 arranged in a loaded roller rolling path 6 and the unloaded return path.
    Type: Application
    Filed: October 29, 2008
    Publication date: October 21, 2010
    Applicant: THK CO., LTD.
    Inventors: Soshi Miyahara, Masahiko Yoshino, Lina Teng, Tsutomu Togashi, Takashi Sakuyama, Kentaro Nishimura, Tetsuya Miura, Akimasa Yoshida, Yusuke Todoroki
  • Publication number: 20100242651
    Abstract: Provided is a rolling-element screw device in which a recess can be easily formed in an outer diameter portion of a nut main body for receiving a circulation member. At both ends of a straight passage 5 of the nut main body 2, a pair of circulation members 8 is provided respectively, in each of which a direction change passage 6 is formed for connecting the straight passage 5 to a loaded rolling-element rolling passage 3. The circulation members 8 in a pair are fit in a pair of recesses 15, respectively, formed in the outer diameter portion of the nut main body 2. The direction change passage 6 of each circulation member 8 has a curve passage 22 which is connected to the loaded rolling-element rolling passage 3. The curve passage 22 is formed in such a way that, when seen in the axial direction of the nut main body 2, the track of the center of each rolling element 7 moving in the curve passage takes the shape of an arc.
    Type: Application
    Filed: March 25, 2010
    Publication date: September 30, 2010
    Applicant: THK CO., LTD.
    Inventors: Takeki Shirai, Katsuya Iida, Soshi Miyahara, Tsutomu Togashi
  • Publication number: 20100242652
    Abstract: Provided is a ball screw device having a novel ball circulation structure suitable for a screw shaft with a large lead, optimum for downsizing and weight saving of a nut member, capable of being manufactured at low cost, and capable of exhibiting high reliability even under severe use conditions. In a ball screw device (1) where a screw shaft (2) and a nut member (3) are screwed to each other through an intermediation of a large number of balls (4), a no-load ball path (50) which forms an infinite circulation path for the balls (4) is constituted by a no-load ball groove (33a) spirally formed in an inner peripheral surface of a through-hole (30) of the nut member (3) and by a pair of direction change grooves (34) which communicatively couple a load rolling groove (20a) and the no-load ball groove (33a) to each other so as to complete the infinite circulation path as a closed loop.
    Type: Application
    Filed: March 19, 2007
    Publication date: September 30, 2010
    Applicant: THK CO., LTD.
    Inventors: Takeki Shirai, Yuji Tachikake, Soshi Miyahara, Masahiko Yoshino, Takashi Sakuyama, Lina Teng, Tsutomu Togashi
  • Publication number: 20100236345
    Abstract: There is provided a new rolling body screw device manufactured with cheap cost without degrading quality in comparison with a conventional device even for a device having any large dimension in an end-cap type rolling body screw device. The rolling body screw device includes the direction changing passages 42 each including: a scoop-up portion 43 scooping a ball rolling in a loaded rolling body passage as a loaded area of the endless track so as to hand over the balls to the direction changing passage 42 as a non-loaded area of the endless track; and a route path 44 forming a circulation path of the ball scooped by the scoop-up portion. Each of the return pieces is composed, in combination, of a metal part 41a formed of a metal material including the scoop-up portion 43, and non-metal parts 41b, 41c formed of a non-metal material including the route path 44.
    Type: Application
    Filed: October 7, 2008
    Publication date: September 23, 2010
    Applicant: THK CO., LTD.
    Inventors: Soshi Miyahara, Toshiaki Kadono, Masahiko Yoshino, Takashi Sakuyama, Lina Teng, Tsutomu Togashi, Kazuhiro Tani
  • Patent number: 6734583
    Abstract: A slider unit having built in a moving-coil linear motor ensuring high propulsion, is kept slim in overall height. A moving-coil assembly is made slim, with high stiffness, and is composed of an iron core of platy-configuration, and at least one set of three-phase armature coils wound around the iron core in the form of flat rectangular configuration in a plane intersecting the sliding direction. Comparatively more coil sides of the armature coils contribute to high propulsion. Like poles on either field magnet are placed in opposition to each other across the air gap, whereby the magnetic attraction is cancelled to reduce the load on the linear motion guide unit.
    Type: Grant
    Filed: August 20, 2001
    Date of Patent: May 11, 2004
    Assignee: Nippon Thompson Co., Ltd.
    Inventors: Shoji Fujisawa, Tsutomu Togashi
  • Patent number: 6558430
    Abstract: There is provided an air-cylinder apparatus for use in a prosthetic limb capable of effectively adjusting the pressure characteristics over a wide range of walking speed. A second chamber 82 defined by a piston 113 is increased in pressure by air confined therein in accordance with the bending motion of the knee. Air is restricted from flowing out of the second chamber 82 by a constant throttle valve 140. In addition, the second chamber 82 is divided into plural chambers 821, 822 in accordance with increase in bending angle of the knee and air is restricted from flowing out of the newly divided chambers 821, 822 by throttle valves corresponding thereto. The division of the second chamber 82 is achieved by mutual engagement between a projection 1140b on the piston side and a recess 1127 on the bottom part of a cylinder body.
    Type: Grant
    Filed: November 6, 2000
    Date of Patent: May 6, 2003
    Assignee: Nabco Limited
    Inventors: Yoshiaki Nakaya, Tsutomu Togashi, Masahiko Okuda, Norio Shiraishi
  • Publication number: 20020021050
    Abstract: A slider unit having built in a moving-coil linear motor ensuring much high propulsion, with even kept slim in the overall height to the extent comparative to the slider units ever used. A moving-coil assembly is made slim in construction, with even high in stiffness. The moving-coil assembly is composed of an iron core of platy-configuration, and at least one set of three-phase armature coils wound around the iron core in the form of flat rectangular configuration in a plane intersecting the sliding direction. As there are more coil sides of the armature coils contributing to the propulsion, compared with a pole width in the moving direction of the field magnets, the high propulsion may be realized. Moreover, since like poles on either field magnet are placed in opposition to each other across the air gap, the magnetic attraction is cancelled to reduce the load on the linear motion guide unit, so that the table is allowed withstanding much load capacity.
    Type: Application
    Filed: August 20, 2001
    Publication date: February 21, 2002
    Inventors: Shoji Fujisawa, Tsutomu Togashi