Patents by Inventor Masashi Nagano

Masashi Nagano 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: 4920818
    Abstract: A speed control device for a bicycle is provided, which includes a positioning mechanism comprising a positioning member having a plurality of engaging portions, an engaging member selectively engageable one at a time with the engaging portions and an elastic member for biasing the engaging member toward the engaging portions. A reaction force of the elastic member affects the torque of the operating lever to generate a clicking vibration felt by the cyclist. The speed control device includes a thrust bearing which, when the operating lever is operated and the engaging member disengages from one of the engaging portions and transfers to the adjacent engaging portion, bears the reaction force of the elastic member, thereby reducing the torque of the operating lever and amplifying the clicking vibration thereof.
    Type: Grant
    Filed: July 11, 1988
    Date of Patent: May 1, 1990
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4919004
    Abstract: A speed-change operating device for a bicycle includes an operating lever for actuating a derailleur, the operating lever being supported rotatably through a lever shaft to a base member adapted to be supported on the bicycle. A friction mechanism applies to the lever an adjustable rotational resistance against a bias force of a return spring associated with the derailleur. A positioning mechanism includes a positioning member having a plurality of engaging portions for precisely setting the respective speed change stages of the derailleur and an engaging member engageable with at least one of the engaging portions. An operating mechanism selects between an operating mode and a non-operating mode of the positioning mechanism so that the positioning mechanism can be placed in a non-operating mode, when desired, with the speed-change operation being performed in such non-operating mode only with the friction mechanism resisting the return spring.
    Type: Grant
    Filed: October 20, 1988
    Date of Patent: April 24, 1990
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4905537
    Abstract: A speed-changing device for a bicycle wherein a boss of an operating lever is rotatably supported to a lever shaft, a holder supported non-rotatably to a fixing member including the lever shaft incorporates a sound-generating mechanism comprising a ridge-groove member having a ridge-groove surface and a sound-generator engageable therewith to generate a sound, thereby forming a sound-generator unit, one of the ridge-groove member and sound-generating of the unit is adapted to engage for associated motion with the boss of the operating lever, so that the operating lever is turned to generate a sound.
    Type: Grant
    Filed: February 3, 1984
    Date of Patent: March 6, 1990
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4901824
    Abstract: A bicycle brake shoe for making press contact with a bicycle wheel rim to apply a braking force thereto. The brake shoe includes a shoe body which is elongated in the rotation direction of the wheel rim and which has a braking surface opposite to the braked surface of the rim. The shoe body also includes at least one slit extending in a direction transverse to the longitudinal dimension of the braking surface and extending inwardly into the shoe body to a predetermined depth.
    Type: Grant
    Filed: December 11, 1984
    Date of Patent: February 20, 1990
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4896557
    Abstract: A speed-change lever device for a bicycle in which a boss of an operating lever is rotatably supported to a lever shaft, and in which a friction plate is supported to an eccentric portion of the lever shaft to give a resistance against rotation of the operating lever. An urging member is provided having a not-round through bore by which it is fitted onto the not-round portion of the lever shaft. A screw member is provided to engage with screw threads in the lever shaft forwardly or backwardly to adjust thereby a rotational resistance given to the lever through the urging member. The urging member includes an urging portion for urging the friction plate toward the boss of the operating lever through a forward screw-movement of the screw member during assembly.
    Type: Grant
    Filed: February 7, 1984
    Date of Patent: January 30, 1990
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4895553
    Abstract: A derailleur for a bicycle is provided in which a support member is pivotally supported to a movable member of a linkage mechanism having a forcible movement mechanism. A chain guide is fixed to the support member at adjustable positions, so that the chain guide position can be adjusted by the forcible movement mechanism to change the moving direction of the chain guide. This enables the position of a guide pulley of the chain guide to be adjusted in position with respect to each sprocket of a multi-stage sprocket assembly.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: January 23, 1990
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4892005
    Abstract: An end cap is provided for an outer cable guiding a control wire at a bicycle. The end cap has a chamber formed between the bottom wall of a cap body and a holder for holding the outer cable to be fitted into the cap body. A sealing member is disposed in the chamber, thereby preventing mud attached to the other surface of the control wire from entering into the outer cable.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: January 9, 1990
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4889521
    Abstract: A multistage sprocket assembly is provided which includes at least one larger diameter sprocket and at least one smaller diameter sprocket assembled in a relationship such that the center point between a pair of adjacent teeth at the larger diameter sprocket and the center point between a pair of adjacent teeth at the smaller diameter sprocket are positioned on a tangent extending along the chain path when the chain is being shifted from the smaller diameter sprocket to the larger diameter sprocket. The distance between both the center points is equal to an integer multiple of the chain pitch. A chain guide portion is provided at the inside surface of the larger diameter sprocket and at a position corresponding to a moving path of a driving chain traveling between the aforesaid center points for allowing the chain to move axially of the sprocket assembly slightly toward the larger diameter sprocket during shifting.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: December 26, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4873890
    Abstract: A pedal for a bicycle is provided which includes a shaft unit provided with a pedal shaft and a cylindrical rotary member rotatably supported to the pedal shaft and a pedal body having a foot bearing surface. The pedal body is supported to the shaft unit such that the axially inside portion of the pedal body is displaceable radially of the shaft unit at the fulcrum of the axially outside portion thereof. An elastic member is interposed between the axially inside portion of the pedal body and the shaft unit.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: October 17, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4869709
    Abstract: A driving gear for a bicycle is provided which comprises a gear body provided with a large number of teeth and a support member supporting the gear body. Between the gear body and the support member there is provided a driving transmission for transmitting a driving force from one of the gear body and support member to the other. A gap is provided at the driving force transmission through which the gear body and support member are rotatable relative to each other by a predetermined angle. At a location shifted from the driving force transmission there is provided an elastic member which compensates the gap and is elastically deformed when the gear body and support member rotate relative to each other so as to absorb the gap, thereby enabling the driving force to be transmitted from the driving force transmission.
    Type: Grant
    Filed: May 19, 1988
    Date of Patent: September 26, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4864885
    Abstract: A speed control device is provided for operating a bicycle derailleur via a control wire. The device includes a fixing member, an operating member supported rotatably relative to the fixing member and including a plurality of engaging portions and a passive portion, and an operating lever supported rotatably relative to the fixing member and including a transmitting portion engageable with the passive portion of the operating member to transmit an operating force supplied to the operating lever to the operating member. The operating member has one end of the control wire secured thereto. A lever spring biases the operating lever in a predetermined rotation direction, and a retaining pawl is pivoted to the fixing member and is selectively engageable with the engaging portions of the operating member. A pawl spring biases the retaining pawl in a direction of engagement with the engaging portions.
    Type: Grant
    Filed: March 15, 1988
    Date of Patent: September 12, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4861320
    Abstract: A positioning device is provided for a bicycle derailleur, wherein a fixing member, having a bottom wall and a side wall, has a movable member movably supported thereto, with a plurality of engaging portions for setting the speed change stages of the bicycle being provided at one of the fixing member and the movable member and a retainer engageable with one of the engaging portions being provided at the other of the fixing member and the movable member. Connecting mechanisms are provided at the fixing member and movable member for connecting the positioning device to two members of the derailleur linkage mechanism which are movable relative to each other so that the positioning device is detachably mountable to the derailleur.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: August 29, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4854924
    Abstract: A cover device for a driving chain stretched between a front chain gear and a rear chain gear of a bicycle, which is provided with a large number of first and second covers each provided with an outside cover portion for covering a space between the link plates of the chain and side cover portions in continuation of both widthwise ends of the outside cover portion for covering the side surface of each link plate. The utmost end of each of the side cover portions is bent toward the center of the width dimension of the outside cover portion to thereby form an engaging portion engageable with the widthwise edge of each link plate.
    Type: Grant
    Filed: October 17, 1988
    Date of Patent: August 8, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4854191
    Abstract: A speed change device for a bicycle is provided which includes a planetary gear mechanism in which a plurality of lock pawls are provided at a fixed shaft to control locking and unlocking of a plurality of sun gears. The sun gears are independently rotatably supported relative to a crank shaft. A plurality of clutch pawls corresponding to the lock pawls are provided at a control member, with the clutch pawls being actuated by driving rotation of the crank shaft. This enables the lock pawls to be controlled to move from a locking position to an unlocking position.
    Type: Grant
    Filed: July 11, 1988
    Date of Patent: August 8, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4852698
    Abstract: A side-pull type caliper brake comprising a pair of brake arms having brake shoes respectively, a fixing member having a pivot shaft and a support arm extending from one radial side of the pivot shaft, and a return spring, so that one of the brake arms is pivoted to the pivot shaft, the other is pivoted to the support arm, and an association mechanism having an adjusting screw bolt is provided between the brake arms, wherein the pivot position for the brake arm at the support arm is displaced toward the brake shoe with respect to a horizontal line passing the axis of the pivot shaft, a straight line connecting the axis of the pivot shaft and the pivot position of the brake arm at the support arm, is inclined with respect to the horizontal line, the adjusting screw bolt is disposed perpendicularly with respect to the inclining horizontal line, and the rotary operating portion at the adjusting screw bolt is outwardly inclined with respect to the utmost end of the screw bolt, thereby facilitating operation of th
    Type: Grant
    Filed: November 25, 1988
    Date of Patent: August 1, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4850940
    Abstract: An adjusting mechanism which can adjust the axial portion of a chain guide at a bicycle derailleur by movement of a cylindrical holder, which is larger in diameter than a horizontal shaft supporting the chain guide, with respect to a housing at the movable member.
    Type: Grant
    Filed: December 6, 1988
    Date of Patent: July 25, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4840081
    Abstract: A speed-change operating lever is provided for a bicycle derailleur and includes a winding portion for a control wire connected to the derailleur, an operating portion in continuation of one side of the boss and extending outwardly therefrom, and a retaining portion for retaining one end of the wire. The boss has a winding amount changing device for changing the amount of the control wire wound on the winding portion so as to alter the operating stroke of the lever to adapt it for use with different sprocket assemblies having different distances between sprockets.
    Type: Grant
    Filed: February 11, 1988
    Date of Patent: June 20, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4840085
    Abstract: A pedal for a bicycle is provided in which an utmost end portion or free end of a cantilevered pedal shaft has a reduced diameter and a pair of first and second ball bearings are provided between the utmost end of the pedal shaft and the pedal body. As a result of this structure, the pedal body can be made with a smaller thickness in comparison with conventional pedal bodies which are provided at the base or fixed side of the cantilevered pedal shaft with the first ball bearing.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: June 20, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4838115
    Abstract: A pedal for a bicycle is provided which includes a shaft unit supporting a tubular member to a pedal shaft through a pair of bearing members. The tubular member is held in particular rotational conditions as adjusted by a pusher and a lock member. A pedal body is detachably fitted onto the shaft unit and the tubular member is fixed to the pedal body through a lock bush which screws with the pedal body. This enables the pedal body to be mounted on the shaft unit in a readily exchangeable condition.
    Type: Grant
    Filed: April 22, 1988
    Date of Patent: June 13, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano
  • Patent number: 4838401
    Abstract: A transmission mechanism which includes a rotatable driving member and a driven member. One of the driving member and the driven member includes ratchet teeth and the other supports a first transmission pawl and a second transmission pawl each having engaging portions engageable with the ratchet teeth and substantially semicircular-shaped base portions. A substantially C-shaped pawl spring is wrapped around the one of the driving member and the driven member which supports the pawls. The pawl spring biases the first transmission pawl and the second transmission pawl in a direction such that the engaging portions thereof engage with the ratchet teeth. A locking member is provided to prevent rotation of the pawl spring. The first transmission pawl is positioned such that its engaging portion is oriented toward the first free end of the pawl spring and the second transmission pawl is positioned such that its engaging portion is oriented away from the second free end of the pawl spring.
    Type: Grant
    Filed: March 23, 1987
    Date of Patent: June 13, 1989
    Assignee: Shimano Industrial Company Limited
    Inventor: Masashi Nagano