Patents by Inventor Takaaki Madachi

Takaaki Madachi 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).

  • Publication number: 20020007774
    Abstract: The invention provide an adjustable steering mechanism for a watercraft. The watercraft has a hull including a main body, an upper wall engaging the hull and cooperating therewith to defme an engine compartment for housing an engine. The engine has an output shaft arranged to drive a water propulsion device of the watercraft The upper wall has a top surface and a bottom surface. The bottom surface facing forwardly towards engine compartment. A first steering means extends through the upper wall and is in communication with a steering mechanism of the watercraft. The first steering means also coupled to a steering shaft and handle. The steering shaft and handle are journalled for rotation about a first axis with respect to a rotation member.
    Type: Application
    Filed: March 20, 2001
    Publication date: January 24, 2002
    Inventors: Takaaki Madachi, Tatsuya Yoshida, Masahiro Harada
  • Patent number: 6202584
    Abstract: The invention provide an adjustable steering mechanism for a watercraft. The watercraft has a hull including a main body, an upper wall engaging the hull and cooperating therewith to define an engine compartment for housing an engine. The engine has an output shaft arranged to drive a water propulsion device of the watercraft The upper wall has a top surface and a bottom surface. The bottom surface facing forwardly towards engine compartment. A first steering means extends through the upper wall and is in communication with a steering mechanism of the watercraft. The first steering means also coupled to a steering shaft and handle. The steering shaft and handle are journalled for rotation about a first axis with respect to a rotation member.
    Type: Grant
    Filed: May 2, 2000
    Date of Patent: March 20, 2001
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Takaaki Madachi, Tatsuya Yoshida, Masahiro Harada
  • Patent number: 6139381
    Abstract: An air supply conduit system for a watercraft having an air breathing internal combustion engine within the watercraft interior includes at least one air supply conduit extending from an outlet end located in the watercraft interior to an inlet end located outside the watercraft. A noise suppressing resonating chamber connected to the air supply conduit damps noise from the internal combustion engine from the outlet end of the conduit towards the inlet end thereof. The air supply conduit may be positioned within the watercraft to minimize entrapment of liquid within the conduit and the noise suppressing resonating chamber. An inlet fitting including a noise suppressor is located at the inlet end of the conduit.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: October 31, 2000
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Akitaka Suzuki, Takaaki Madachi, Satoshi Koyano, Masaru Tamaki
  • Patent number: 6105528
    Abstract: A steering handle apparatus for a watercraft provided with a steering shaft comprises a housing attached to the body of the watercraft, a tube member supported on the housing so as to be able to tilt back and forth around a pivot portion and including a gear portion and a guide hole through which the steering shaft is passed, a locking member including a fitting portion movable between a locking position for engagement with the gear portion and an unlocking position for disengagement from the gear portion, and an operating member including a retaining portion for moving the locking member. The operating member is operable between an up position in which the locking member is moved to the unlocking position and a down position in which the locking member is moved to the locking position.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: August 22, 2000
    Assignees: NHK Morse Co., Ltd., Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Shigeru Kuroi, Takaaki Madachi
  • Patent number: 6055922
    Abstract: The invention provide an adjustable steering mechanism for a watercraft. The watercraft has a hull including a main body, an upper wall engaging the hull and cooperating therewith to define an engine compartment for housing an engine. The engine has an output shaft arranged to drive a water propulsion device of the watercraft. The upper wall has a top surface and a bottom surface. The bottom surface facing forwardly towards engine compartment. A first steering means extends through the upper wall and is in communication with a steering mechanism of the watercraft. The first steering means also coupled to a steering shaft and handle. The steering shaft and handle are journalled for rotation about a first axis with respect to a rotation member.
    Type: Grant
    Filed: December 1, 1997
    Date of Patent: May 2, 2000
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Takaaki Madachi, Tatsuya Yoshida, Masahiro Harada
  • Patent number: 5967864
    Abstract: A jet propulsion system for watercraft employs twin impellers contained within a common housing assembly. The housing assembly defines an intake duct that delivers water from a single water inlet opening to impellers supported within the housing. The inlet opining can be positioned centrally on the watercraft to avoid drawing air in during abrupt maneuvering. A dividing wall extends from a location forward of the impellers into the water inlet duct to divide the flow of water well upstream of the impellers. The dividing wall is configured to reduce cross-effects caused of the counter-rotating impellers in the water flow upstream of the impellers without requiring any substantial change in direction of the water flow from the water inlet opening to the impellers.
    Type: Grant
    Filed: November 7, 1996
    Date of Patent: October 19, 1999
    Assignee: Yahama Hatsudoki Kabushiki Kaisha
    Inventors: Satoshi Koyano, Takaaki Madachi, Yasukiko Henmi