Patents by Inventor Tsutomu Funakubo

Tsutomu Funakubo 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: 20050083985
    Abstract: A turbo-blower for use with a laser oscillator to provide a flow of a laser medium gas under pressure. The turbo-blower includes an impeller with a rotation axis, the impeller sucking a laser medium gas in an axial direction and discharging the laser medium gas in a radial outward direction; a casing including a gas passage for providing a spiral flow of the laser medium gas discharged from the impeller; and a collecting section provided in the casing and including a chamber fluidly communicated with the gas passage, the collecting section collecting particulates contained in the laser medium gas into the chamber due to a centrifugal force generated in the laser medium gas flowing through the gas passage. The chamber of the collecting section is fluidly communicated with the gas passage through a slit locally formed in a wall of the casing.
    Type: Application
    Filed: October 15, 2004
    Publication date: April 21, 2005
    Applicant: FANUC LTD.
    Inventors: Akira Egawa, Tsutomu Funakubo, Kazuya Ohta
  • Patent number: 5285457
    Abstract: The present invention relates to an apparatus for detecting an abnormal bearing condition of a blower utilized for gas laser equipment, and the purpose of the invention is to immediately find abnormal bearing conditions of the blower as a result of lubrication failures.
    Type: Grant
    Filed: December 18, 1992
    Date of Patent: February 8, 1994
    Assignee: Fanuc Ltd.
    Inventors: Tsutomu Funakubo, Kenji Nakahara
  • Patent number: 5206873
    Abstract: A turbo blower is used in combination with a gas laser oscillation device for machining, e.g., cutting off, workpieces. The turbo blower comprises a shaft (2) having an impeller (1) on one end thereof, a pair of bearings (5, 6) on which the shaft (2) is supported, and a motor (3, 4) for rotating the shaft. Heat radiating fins (11) are mounted on the shaft (2) for radiating the heat which is generated by a rotor (3) of the motor, thus preventing the heat from being transmitted to the bearings (5, 6). The heat radiating fins are forcibly cooled by a portion of a laser gas for thereby greatly increasing the heat radiation efficiency. The service life of the grease in the bearings and the bearings themselves is increased, thus reducing an expenditure of labor for grease replenishment and bearing replacement. The bearings are also increased in reliability.
    Type: Grant
    Filed: May 22, 1991
    Date of Patent: April 27, 1993
    Assignee: Fanuc Ltd.
    Inventors: Tsutomu Funakubo, Norio Karube, Kenji Nakahara
  • Patent number: 5124997
    Abstract: A turbo blower for a laser device, including a shaft having an impeller on one end thereof, a pair of bearings, having inside grease spaces and supporting the shaft Non-contact seal portions are provided for preventing an outflow of grease, whereby other spaces for retaining the grease are formed on either side of the bearings. Although the grease in the inside spaces of the bearings is urged to escape from the bearings by the centrifugal force of the rotation of the shaft, the grease is prevented from flowing out of the spaces on either side of the bearing by the non-contact seal portions.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: June 23, 1992
    Assignee: Fanuc Ltd.
    Inventors: Tsutomu Funakubo, Norio Karube
  • Patent number: 5111474
    Abstract: A laser oscillator device comprises an electric-discharge tube for producing an electric discharge in a laser gas contained in the electric-discharge tube for laser excitation, an optical resonator for effecting laser oscillation, and a gas circulating device having a gas blower and a cooling unit for forcibly cooling the laser gas. The gas blower has an impeller that is rotatable in the laser gas and bearings that are lubricated by grease. With this arrangement, contamination of the optical parts is prevented and the device can easily be maintained.
    Type: Grant
    Filed: July 19, 1991
    Date of Patent: May 5, 1992
    Assignee: Fanuc Ltd.
    Inventors: Tsutomu Funakubo, Norio Karube
  • Patent number: 5060238
    Abstract: A laser oscillator device comprises an electric-discharge tube (1) for producing an electric discharge in a laser gas contained in the electric-discharge tube for laser excitation, an optical resonator (2, 3) for effecting laser oscillation, and a gas circulating device having a gas blower (15) and a cooling unit (8) for forcibly cooling the laser gas. The gas blower (15) has an impeller (16) rotatable in the laser gas. An electric motor for driving the turbo impeller has a stator (20) cooled by thermal contact with a water-cooled medium (25) or an air-cooled medium, and a rotor (19) cooled by contact with a gas flowing between the rotor (19) and the stator (20). The motor for driving the turbo impeller can thus sufficiently be cooled.
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: October 22, 1991
    Assignee: Fanuc Ltd
    Inventors: Norio Karube, Tsutomu Funakubo
  • Patent number: 5022039
    Abstract: A turbo blower for a laser comprises a motor which includes a shaft (17) having a distal end to which a turbo impeller (16) is mounted, a pair of bearings (22,23) for supporting the shaft (17), a rotor (19(, and a stator (20). A squeezed-film damper (36,37) is provided around each of the bearings (22,23), whereby vibration of the blower is damped. The damping coefficient of the squeezed-film dampers (36,37) are different from each other, whereby vibration at the bearing is reduced.
    Type: Grant
    Filed: May 30, 1990
    Date of Patent: June 4, 1991
    Assignee: Fanuc Ltd
    Inventors: Norio Karube, Tsutomu Funakubo