Patents by Inventor Ryoji Zama

Ryoji Zama 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: 11326610
    Abstract: A blower may include a motor; a centrifugal fan configured to rotate with rotation of the motor; a casing configured to guide air from a suction port to a discharge port; a trigger configured to be pressed; and a control board configured to control rotation of the motor. The control board may include a normal mode and a low speed mode. In the normal mode, the control board may be configured to adjust a rotation speed of the motor in accordance with a degree by which the trigger is pressed. In the low speed mode, the control board may be configured to adjust the rotation speed of the motor to a target rotation speed, wherein the target rotation speed is lower than a maximum rotation speed of the motor that is achieved when the degree by which the trigger is pressed is a maximum degree in the normal mode.
    Type: Grant
    Filed: October 30, 2020
    Date of Patent: May 10, 2022
    Assignee: MAKITA CORPORATION
    Inventors: Shinsuke Naka, Ryoji Zama
  • Publication number: 20210148372
    Abstract: A blower may include a motor; a centrifugal fan configured to rotate with rotation of the motor; a casing configured to guide air from a suction port to a discharge port; a trigger configured to be pressed; and a control board configured to control rotation of the motor. The control board may include a normal mode and a low speed mode. In the normal mode, the control board may be configured to adjust a rotation speed of the motor in accordance with a degree by which the trigger is pressed. In the low speed mode, the control board may be configured to adjust the rotation speed of the motor to a target rotation speed, wherein the target rotation speed is lower than a maximum rotation speed of the motor that is achieved when the degree by which the trigger is pressed is a maximum degree in the normal mode.
    Type: Application
    Filed: October 30, 2020
    Publication date: May 20, 2021
    Applicant: Makita Corporation
    Inventors: Shinsuke NAKA, Ryoji ZAMA
  • Publication number: 20190301164
    Abstract: A blower reduces debris blown toward an operator when air is jetted from a distal end of a blower pipe. A blower includes a blower body and a blower pipe. The blower body includes an impeller drivable to rotate by a prime mover, and a casing accommodating the impeller. The casing includes an air inlet and an air outlet. The blower pipe includes a basal end coupled to the air outlet, a distal end from which air ejected through the air outlet is jetted, and a peripheral wall having one or more openings.
    Type: Application
    Filed: February 22, 2019
    Publication date: October 3, 2019
    Applicant: MAKITA CORPORATION
    Inventors: Shinsuke NAKA, Ryoji ZAMA
  • Publication number: 20190021243
    Abstract: A power blower includes a power blower main body and a blower tube member. The main body takes in air through an air intake portion by rotation of a blower fan rotated by a motor and discharges the air from an air discharge portion. The blower tube member has an opening on a base end side through which air discharged from the air discharge portion of the main body flows in, and an opening on a tip end side from which the air which has flowed in, is blown out. When a plane perpendicular to an axis of the blower tube member is in contact with the opening at the tip end side of the blower tube member, blown-air passages are formed on opposite sides of contact portions of the opening at the tip end side of the blower tube member and the plane.
    Type: Application
    Filed: June 21, 2018
    Publication date: January 24, 2019
    Applicant: MAKITA CORPORATION
    Inventors: Shinsuke NAKA, Ryoji ZAMA
  • Patent number: 6691650
    Abstract: A piston valve type layered scavenging 2-cycle engine has a reduced engine height, is light and compact, and achieves an exhaust gas purification. An upper edge of a pilot air port provided in an inner wall of a cylinder is positioned at substantially the same height as that of an upper edge of an intake port. An extended portion extended to a lower side rather than a piston lower edge at a position opposing to the intake port is provided in a lower end portion at a position opposing to the pilot air port in the piston. An interval between the right and left extended portions is set to be larger than an outer width of a balance weight of a crank shaft. A piston groove which connects the pilot air port to the scavenging port at a time of an intake stroke is provided on an outer peripheral surface of the extended portion. A second scavenging flow passage having a simple structure is provided in a lower side of a first scavenging flow passage.
    Type: Grant
    Filed: November 6, 2002
    Date of Patent: February 17, 2004
    Assignee: Komatsu Zenoah Co.
    Inventors: Ryoji Zama, Takeshi Watanabe
  • Publication number: 20030140874
    Abstract: A piston valve type layered scavenging 2-cycle engine has a reduced engine height, is light and compact, and achieves an exhaust gas purification. Accordingly, an upper edge (14a) of a pilot air port (14) provided in an inner wall of a cylinder (10) is positioned at substantially the same height as that of an upper edge (15a) of an intake port (15). An extended portion (32) extended to a lower side rather than a piston lower edge (31) at a position opposing to the intake port is provided in a lower end portion at a position opposing to the pilot air port in the piston (30). An interval (W1) between the right and left extended portions is set to be larger than an outer width (W2) of a balance weight (23) of a crank shaft (20). A piston groove (34) which connects the pilot air port to the scavenging port (12) at a time of an intake stroke is provided on an outer peripheral surface of the extended portion.
    Type: Application
    Filed: November 6, 2002
    Publication date: July 31, 2003
    Inventors: Ryoji Zama, Takeshi Watanabe