Patents Assigned to Tsubakimoto Chain Co.
  • ENGAGEMENT CHAIN
    Publication number: 20100140572
    Abstract: There is provided an engagement chain whose driving force per occupied space is increased, whose durability is improved by reducing stress in a direction of bending a connecting pin and whose engagement noise during driving is reduced. The engagement chain includes a large number of outer and inner link plates, each having hook-like portions, which are connected in a chain longitudinal direction by connecting pins, the large number of outer and inner link plates are connected flexibly without gap in the chain width direction while the back surfaces of the link plates opposite to the hook-like portions engage with driving sprockets.
    Type: Application
    Filed: November 24, 2009
    Publication date: June 10, 2010
    Applicant: TSUBAKIMOTO CHAIN CO.
    Inventor: Toshihiko AOKI
  • TIMING CHAIN DRIVE SYSTEM
    Publication number: 20100137085
    Abstract: In a timing chain driving system in which the speed of a driving sprocket fluctuates cyclically, the tooth pitch of a driven sprocket from which a tension span of the chain travels toward the driving sprocket varies cyclically around the circumference of the driven sprocket so that the tooth pitch at the point at which the timing chain disengages from the driven sprocket is at a minimum when the rotational speed of the driving sprocket is maximum, moderating fluctuations in chain tension. A similar effect can be achieved in the case of a driving sprocket having a cyclically varying tooth pitch by arranging the driving sprocket so that its tooth pitch is maximum at the point at which it is engaged by the chain when its rotational speed is maximum.
    Type: Application
    Filed: November 11, 2009
    Publication date: June 3, 2010
    Applicant: TSUBAKIMOTO CHAIN CO.
    Inventors: Yoshikazu Nakano, Shunji Sakura, Kohei Kunimatsu
  • TRANSMISSION CHAIN
    Publication number: 20100137088
    Abstract: The invention provides a transmission chain including inner plates, bushings, outer plates, and a cylindrical hollow pin capable of supplying lubricant oil on a outer circumference of the pin across the whole area of the longitudinal direction of the pin when a chain is in operation, even when the chain is tensioned.
    Type: Application
    Filed: November 13, 2009
    Publication date: June 3, 2010
    Applicant: TSUBAKIMOTO CHAIN CO.
    Inventors: Seigo Ohsawa, Arimasa Kaga
  • SILENT CHAIN WITH BUSHINGS
    Publication number: 20100120568
    Abstract: A silent chain with bushings comprises outer and inner links interconnected in alternating relationship. Each outer link comprises outer plates and connecting pins press-fit into the pin holes in the outer plates. Each inner link comprises a center guide plate disposed at a location midway between the sides of the chain, and toothed inner link plates on both sides of the center guide plate. Bushings are press-fit into bushing holes in the guide plate and the toothed inner link plates. The connecting pins of the outer links extend through bushings of the adjacent inner links, thereby connecting the outer and inner links of the chain are in alternating relationship.
    Type: Application
    Filed: September 11, 2009
    Publication date: May 13, 2010
    Applicant: TSUBAKIMOTO CHAIN CO.,
    Inventor: Toshitaka Ogo
  • Chain transmission device
    Patent number: 7713156
    Abstract: In a chain transmission having a sprocket with an elastic ring sandwiched between a central hub and an annular toothed outer member, the tooth form is such that the root diameter, that is, the diameter of the tooth gap bottom circle, is greater than the root diameter in a sprocket having a standard ISO tooth form.
    Type: Grant
    Filed: December 5, 2007
    Date of Patent: May 11, 2010
    Assignee: Tsubakimoto Chain Co.
    Inventors: Shunji Sakura, Akira Hirai
  • Hydraulic tensioner
    Patent number: 7713155
    Abstract: In the check valve of a hydraulic tensioner, a bell-shaped retainer is provided with plural, branched, leg portions which resiliently grip the outer surface of a ball seat. Oil induction slots are formed between adjacent branched leg portions of the retainer to provide oil flow paths that are unimpeded by the plunger-biasing spring of the tensioner.
    Type: Grant
    Filed: December 4, 2007
    Date of Patent: May 11, 2010
    Assignee: Tsubakimoto Chain Co.
    Inventors: Tsutomu Namie, Toyonaga Saitoh
  • PULLEY FOR USE WITH TOOTHED BELT
    Publication number: 20100105509
    Abstract: There is provided a pulley for use with a toothed belt capable of reducing the noise generated when the pulley engages with the toothed belt, while reducing the manufacturing costs and time used to manufacture the pulley. The pulley includes a disk whose inner circumference is fitly attached to a rotary shaft. The outer circumference of the pulley has teeth to be engaged with the toothed belt and flanges erected on both sides of the tooth, wherein the flanges have a plurality of through holes that penetrate through the flanges in a direction of the rotary shaft.
    Type: Application
    Filed: October 14, 2009
    Publication date: April 29, 2010
    Applicant: TSUBAKIMOTO CHAIN CO.
    Inventors: Masato TOMOBUCHI, Masaru KANAMORI
  • Link plate for roller chain and manufacturing method thereof
    Patent number: 7704175
    Abstract: A method of manufacturing a link plate for a roller chain, and the resulting link plate in which (1) the link plate has a shape comprising a pair of right and left pin holes, a pair of right and left half arcs, which are spaced outwardly from the pin holes respectively, and a pair of upper and lower straight line portions connecting both ends of the pair of right and left half arcs. There are shaved lengths along the pair of upper and lower straight line portions extending into the half arcs, the shaved length extending between the outermost positions of both ends of said pin holes.
    Type: Grant
    Filed: September 13, 2006
    Date of Patent: April 27, 2010
    Assignee: Tsubakimoto Chain Co.
    Inventors: Toshihiko Miyazawa, Toshifumi Satoh
  • Chain transmission device
    Patent number: 7699733
    Abstract: In a chain transmission, vibration reduction is improved by an elastic member, sandwiched between an inner hub of a sprocket and a toothed outer circumferential member, in combination with a sprocket tooth configuration in which two or three different tooth form pitch angles are arranged irregularly along the sprocket's pitch circle.
    Type: Grant
    Filed: December 4, 2007
    Date of Patent: April 20, 2010
    Assignee: Tsubakimoto Chain Co.
    Inventors: Shunji Sakura, Akira Hirai
  • CHAIN
    Publication number: 20100093475
    Abstract: In a roller chain or a rollerless bushing chain, each outer link plate is a gourd-shaped plate having, along the direction of elongation of the chain, a narrow middle portion between two end portions larger than the middle portion. The back height of each outer link plate, is smaller than the back height of each of the inner link plates. The area of each cross-section of each outer link plate, on a section plane perpendicular to the direction of chain elongation and passing through the center of a connecting pin, is at least as large as the area of each cross-section of each inner link plate taken on a section plane perpendicular to the direction of chain elongation and passing through the center of a bushing.
    Type: Application
    Filed: September 9, 2009
    Publication date: April 15, 2010
    Applicant: TSUBAKIMOTO CHAIN CO..
    Inventor: Toshihiko Miyazawa
  • Chain transmission device
    Patent number: 7691020
    Abstract: In a roller or bushing chain transmission a standard roller or bushing chain having a uniform chain pitch meshes with a sprocket having at least two different tooth form pitches.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: April 6, 2010
    Assignee: Tsubakimoto Chain Co.
    Inventors: Shunji Sakura, Akira Hirai, Masatoshi Sonoda
  • SELF-LUBRICATING CHAIN
    Publication number: 20100081528
    Abstract: The invention relates to a self-lubricating chain which includes a connecting pin which is used to connect inner and outer link portions. The connecting pin includes a lubricating hole and a hollow portion where a lubricating oil supply may be disposed and held in place by a lid member, which provides a press fit and tight seal so as to provide a reliable lubricating oil supply and a durable chain which has improved durability.
    Type: Application
    Filed: July 30, 2009
    Publication date: April 1, 2010
    Applicant: TSUBAKIMOTO CHAIN CO.
    Inventors: Kentaro YAMANE, Makoto FUJIWARA
  • Timing chain drive system
    Patent number: 7686718
    Abstract: In the timing drive of an internal combustion engine, cyclic variations in chain tension, in the span traveling from a camshaft sprocket toward the crankshaft sprocket are leveled by synchronous reciprocating movement of a guide in sliding contact with that span of chain. The maximum rearward speed of the guide coincides approximately with the maximum tension in the span of chain, and the maximum forward speed of the guide coincides approximately with the minimum tension in the chain.
    Type: Grant
    Filed: July 6, 2007
    Date of Patent: March 30, 2010
    Assignee: Tsubakimoto Chain Co.
    Inventors: Yoshikazu Nakano, Kohei Kunimatsu
  • SILENT CHAIN
    Publication number: 20100069188
    Abstract: In a silent chain having interleaved joint link plates and guide link plates each having a pair of teeth and a pair of pin holes, the pin holes in each of the joint link plate are elongated in the direction of elongation of the chain, and extend toward each other from the two connecting pins extending through the pin holes so that a gap is formed between each of the two connecting pins and the other. The pin holes of each of the toothed guide link plates are circular pin holes. The elongation of the pin holes of the joint link plates allows the joint links to shift longitudinally with respect to the guide link plates on engagement of the chain with a sprocket, reducing clashing noise.
    Type: Application
    Filed: August 17, 2009
    Publication date: March 18, 2010
    Applicant: TSUBAKIMOTO CHAIN CO.
    Inventors: Shouhei Adachi, Takayuki Morimoto
  • Cable protection and guide device
    Patent number: 7677024
    Abstract: A cable protection and guide device includes comb teeth-shaped connecting link units. A plurality of side plates of each unit are interconnected through coupling portions. Stopper links of an opposing unit fit between adjacent side plates and interengage the coupling portions. Stopper links limit the bending angle. Connecting arms are integrally molded with the side plates and reside on the bending inner circumferential side of the device opening/closing arms are integrally molded with one of the side plates and reside on the bending outer circumferential side. The comb teeth-shaped connecting link units are opposed to each other.
    Type: Grant
    Filed: April 5, 2008
    Date of Patent: March 16, 2010
    Assignee: Tsubakimoto Chain Co.
    Inventor: Akihiko Utaki
  • ENGAGEMENT CHAIN TYPE DRIVING DEVICE
    Publication number: 20100059727
    Abstract: The invention relates to an engagement chain type driving device including a pair of driving sprockets, which rotate positively and reversely in opposite directions about a pair of rotating shafts, a pair of engagement chains, which engage with each other by the pair of driving sprockets so to be integrated together, and a driving source, which drives the pair of driving sprockets, wherein the engagement chain includes inner tooth plates and outer tooth plates, which each include buckling limiting flat surfaces, the inner tooth plates and outer tooth plates being brought opposite to each other and into contact with each other when the engagement chains are integrated by the pair of driving sprockets, such that the flat surfaces hold the chain engagement position.
    Type: Application
    Filed: September 8, 2009
    Publication date: March 11, 2010
    Applicant: TSUBAKIMOTO CHAIN CO.
    Inventors: Tomoo Suko, Kohei Nakanishi, Tomoyuki Saji, Yoshifumi Takeuchi, Satoshi Ueda, Naoto Shibata
  • ENGAGEMENT CHAIN
    Publication number: 20100051424
    Abstract: An engagement chain in which a buckling strength of a pair of engagement chains engaged with each other is improved without blocking engagement operations between inner tooth plates and between outer tooth plate. The chain includes inner tooth plates, bushes, outer tooth plates and connecting pins. Buckling limiting flat surfaces of adjoining plates are brought into surface contact with each other when opposing segments of the chain are integrated together by driving sockets.
    Type: Application
    Filed: July 23, 2009
    Publication date: March 4, 2010
    Applicant: TSUBAKIMOTO CHAIN CO.
    Inventors: Tomoo Suko, Kohei Nakanishi, Tomoyuki Saji
  • HOISTING AND LOWERING DRIVING ENGAGEMENT MULTI-ROW CHAIN
    Publication number: 20100044190
    Abstract: Aspects of the invention provide a hoisting and lowering driving engagement multi-row chain in which the weight of the chain is balanced across the chain width direction so as to improve the load balance. This allows the weight of articles to be hoisted and lowered more stably hoisted and at higher positions, and results in an improvement of endurance of the chain, reduction of driving noise, miniaturization of the chain size, while the biasing or deflecting of intermediate tooth plates and inner tooth plates in the chain width direction is suppressed.
    Type: Application
    Filed: July 23, 2009
    Publication date: February 25, 2010
    Applicant: TSUBAKIMOTO CHAIN CO.
    Inventors: Takahisa ANDO, Toshihiko TAKASHIMA, Takeshi KONDO, Michio OITAKA
  • Conveyor chain for travel way
    Patent number: 7641044
    Abstract: A conveyor chain for a travel way on which an operator and/or a work carriage are reliably moved in a nonskid manner. The conveyor chain has a series of modules, each with a nonskid material loaded upper surface with front and rear hinge portions for connecting the modules to each other by connecting pins. The nonskid material loaded upper surface has hollows with the hollow surfaces recessed below the upper surface. The upper surface includes a number of supporting ribs project upwardly from the hollow surfaces and terminate flush with the upper surface, so that the transfer of the work carriage is easy and a back bend radius is decreased. Miniaturization and simplification of the conveyor are attained.
    Type: Grant
    Filed: February 1, 2008
    Date of Patent: January 5, 2010
    Assignee: Tsubakimoto Chain Co.
    Inventors: Hajime Ozaki, Katsutoshi Shibayama
  • Hydraulic tensioner
    Patent number: 7641575
    Abstract: The check valve unit of a hydraulic tensioner comprises a check ball, a ball guide and a disc-shaped retainer. The retainer is fixed to the high pressure oil chamber side of the ball guide by crimping an annular portion of the ball guide over the outer edge of the retainer so that substantially all of an annular circumferential portion of the high pressure chamber side of the retainer is held underneath the crimped portion of the ball guide. The crimped portion of the ball guide forms a recess for receiving and positioning a plunger-biasing spring. A ball seat is similarly secured to the inflow side of the ball guide by crimping.
    Type: Grant
    Filed: January 19, 2005
    Date of Patent: January 5, 2010
    Assignee: Tsubakimoto Chain Co.
    Inventor: Osamu Yoshida