Patents Assigned to Ryobi, Ltd.
  • Patent number: 5323840
    Abstract: The horizontal type casting machine is capable of facilitating installation of a water jacket core and providing sufficient fluidity of the molten metal without generation of gas defect in casting a water-cooled type cylinder block. In the horizontal type casting machine, a cavity for the cylinder block is oriented vertically in which a cylinder bore portion of the cylinder block is positioned up and a crank chamber is positioned down. The cavity is defined by a stationary die, a movable die and movable cores. A movable slide core is provided movable relative to the movable die. When the movable slide core is moved to its retracted position, large working space is provided for installing the water jacket core at a given position. By the retracted movement of the movable slide core, large working space can be provided, thereby facilitating installation of the water jacket core. Further, since the water jacket core is set in its suspended fashion, easy positioning of the water jacket core results.
    Type: Grant
    Filed: August 26, 1993
    Date of Patent: June 28, 1994
    Assignee: Ryobi Ltd.
    Inventors: Hirotake Usui, Yoshiaki Egoshi, Joji Umeda, Toru Komazaki
  • Patent number: 5285934
    Abstract: An automatic molten metal supplying device capable of supplying the molten metal within a short period of time while maintaining accuracy in a supply amount and preventing dripping of the molten metal from a ladle and temperature decrease of the molten metal during its transferring state even if the transferred molten metal is of a small volume. A molten metal intake/discharge port is formed at a bottom portion of a ladle, and an atmosphere communication/blockage unit is provided which selectively communicates an internal space of the ladle with an atmosphere. After the molten metal is introduced into the ladle through the intake/discharge port, the space is shut off from the atmosphere. A cross-sectional area of the intake/discharge port is in a range of from 28 to 80 mm.sup.2.
    Type: Grant
    Filed: September 14, 1992
    Date of Patent: February 15, 1994
    Assignee: Ryobi, Ltd.
    Inventors: Noriyoshi Yamauchi, Hitoshi Ishida
  • Patent number: 5285841
    Abstract: A metal mold cooling device capable of employing a cooling pipe having a small diameter insertable into a cooling hole having a small diameter, and capable of performing fine supply control of a cooling liquid to the metal mold for fine temperature control thereto. A cooling pipe is connected to a compressed air source through a pipe and a first change-over valve. Further, the pipe is connected to a branch pipe to which a second change-over valve is connected. A hermetic cooling liquid tank connected to a water source is connected to the second change-over valve. A third change-over valve is provided between the compressed air source and the cooling liquid tank so as to apply pneumatic pressure onto a surface of the cooling liquid in the cooling liquid tank. Since the cooling liquid tank is provided in addition to the water source, pneumatic pressure from the compressed air source can be utilized. The cooling liquid in the cooling liquid tank is compressed and is supplied to the cooling pipe.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: February 15, 1994
    Assignee: Ryobi Ltd.
    Inventors: Noriyoshi Yamauchi, Hitoshi Ishida, Nobuo Iwakuni, Akio Kobashi
  • Patent number: 5250103
    Abstract: An automatic molten metal supplying device and supplying method capable of promoting discharge of molten metal retained in a ladle during pouring into an injection sleeve of a die-casting machine, and capable of preventing a residual molten metal from being suspended from the intake/discharge port. A ladle is selectively communicatable with an atmosphere by the opening/closing unit. The opening/closing unit is connected to a molten metal pressurizing mechanism 20 and a residual molten metal removing mechanism 30 through pipes. At the time of pouring, small volume or low pressure fluid is introduced into the ladle by means of the molten metal pressurizing mechanism through the opening/closing unit. After completion of the pouring, large volume or high pressure fluid is introduced into the ladle by the residual molten metal removing mechanism. Since low volume or low pressure fluid is applied into the ladle during pouring, the molten metal can be smoothly discharged from the ladle.
    Type: Grant
    Filed: February 27, 1992
    Date of Patent: October 5, 1993
    Assignee: Ryobi Ltd.
    Inventors: Noriyoshi Yamauchi, Hitoshi Ishida
  • Patent number: D337252
    Type: Grant
    Filed: July 9, 1991
    Date of Patent: July 13, 1993
    Assignee: Ryobi Ltd.
    Inventors: Hitoshi Tsuru, Toshiaki Saito
  • Patent number: D338605
    Type: Grant
    Filed: October 15, 1991
    Date of Patent: August 24, 1993
    Assignee: Ryobi Ltd.
    Inventor: Tomoshige Dehari
  • Patent number: D338818
    Type: Grant
    Filed: March 22, 1991
    Date of Patent: August 31, 1993
    Assignee: Ryobi Ltd.
    Inventor: Tooru Katsuba
  • Patent number: D339510
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: September 21, 1993
    Assignee: Ryobi Ltd.
    Inventors: Masakazu Sakamoto, Toshiaki Saito
  • Patent number: D339727
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: September 28, 1993
    Assignee: Ryobi Ltd.
    Inventor: Naoki Kikuchi
  • Patent number: D341155
    Type: Grant
    Filed: January 2, 1992
    Date of Patent: November 9, 1993
    Assignee: Ryobi Ltd.
    Inventors: Yutaka Fujii, Tetsuyuki Doi
  • Patent number: D341532
    Type: Grant
    Filed: March 13, 1992
    Date of Patent: November 23, 1993
    Assignee: Ryobi Ltd.
    Inventors: Satoru Watanabe, Masakazu Sakamoto
  • Patent number: D341533
    Type: Grant
    Filed: April 2, 1992
    Date of Patent: November 23, 1993
    Assignee: Ryobi Ltd.
    Inventors: Nobuhiko Karafuji, Masakazu Sakamoto
  • Patent number: D342425
    Type: Grant
    Filed: July 8, 1992
    Date of Patent: December 21, 1993
    Assignee: Ryobi Ltd.
    Inventors: Satoru Watanabe, Masakazu Sakamoto
  • Patent number: D342430
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: December 21, 1993
    Assignee: Ryobi Ltd.
    Inventors: Toshiaki Saito, Akio Takamura
  • Patent number: D342878
    Type: Grant
    Filed: November 6, 1991
    Date of Patent: January 4, 1994
    Assignee: Ryobi Ltd.
    Inventors: Satoru Watanabe, Masakazu Sakamoto
  • Patent number: D343554
    Type: Grant
    Filed: July 27, 1992
    Date of Patent: January 25, 1994
    Assignee: Ryobi Ltd.
    Inventors: Satoru Watanabe, Masakazu Sakamoto
  • Patent number: D345171
    Type: Grant
    Filed: August 19, 1992
    Date of Patent: March 15, 1994
    Assignee: Ryobi Ltd.
    Inventors: Satoru Watanabe, Masakazu Sakamoto
  • Patent number: D347460
    Type: Grant
    Filed: June 19, 1992
    Date of Patent: May 31, 1994
    Assignee: Ryobi Ltd.
    Inventor: Taku Ohi
  • Patent number: D350561
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: September 13, 1994
    Assignee: Ryobi Ltd.
    Inventors: Etsuo Hiraishi, Hideo Aoyama, Katsushi Hirokawa
  • Patent number: D351188
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: October 4, 1994
    Assignee: Ryobi Ltd.
    Inventors: Etsuo Hiraishi, Hideo Aoyama, Katsushi Hirokawa