Patents by Inventor Jun Tagami
Jun Tagami 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).
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Patent number: 5353559Abstract: An anti-earthquake bearing apparatus for bearing the weight of a structure and reducing the vibration energy propagating to the structure by using bearing bodies disposed between the structure and a foundation or another structure has spherical bag-like bearing bodies serving as said bearing bodies formed by sealing a fluid, rubber-like solid or gas into bags constituted by a rubber-sheet material reinforced with fiber. Each bag-like bearing body is provided with charging/discharging ports. Recesses for preventing positional shift of said bag-like bearing bodies are formed on the bottom surface of the structure and on the upper surface of the foundation.Type: GrantFiled: August 22, 1991Date of Patent: October 11, 1994Assignees: Bridgestone Corp., Kajima Corp.Inventors: Nobuo Murota, Keizo Tatsunami, Koji Ishii, Atsuhiko Yasaka, Masao Iizuka, Jun Tagami
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Patent number: 5347771Abstract: A hydraulic cylinder type high damping device in which a cylinder member or a piston rod member is connected to the frame of a structure and the other member is connected to an earthquake-resisting element integrally secured to the frame. A plurality of passages through the piston connect hydraulic chambers on opposite sides of the piston. The passages are provided with pressure-governing valves which control the flow of oil between the hydraulic chambers. In addition, an accumulator system provides a bypass for oil to flow between the hydraulic cylinders in order to modulate the oil pressure in the damping device. Relief valves are provided in parallel with the pressure governing valves to provide a variable damping coefficient which protects the damping device from overloads caused by excessive seismic shock.Type: GrantFiled: June 19, 1992Date of Patent: September 20, 1994Assignees: Kajima Corporation, Kayaba Kogyo Kabushiki KaishaInventors: Takuji Kobori, Koji Ishii, Motoichi Takahashi, Yoshinori Matsunaga, Naoki Niwa, Jun Tagami, Takayuki Mizuno, Kunio Furukawa
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Patent number: 5193323Abstract: A safety monitoring device is provided for the use in an active seismic response and wind control system for exerting a control force, which restrains the vibration of a structure due to disturbances such as earthquake and wind, from an actuator in response to the above vibration. The safety monitoring device measures the work done of a seismic response control force and judges the work done of the seismic response control force to be positive or negative, so that whether or not the seismic response control is properly carried out by the actuator is judged. If any abnormality is found, a stop signal or the like is generated to stop the seismic response and wind control system, whereby the safety of the structure is ensured.Type: GrantFiled: May 3, 1991Date of Patent: March 16, 1993Assignee: Kajima CorporationInventors: Koji Ishii, Masao Iizuka, Jun Tagami, Toshikazu Yamada, Katsuyasu Sasaki, Yoshiki Ikeda
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Patent number: 5177915Abstract: An elasto-plastic damper adapted to be used in a structure for absorbing vibration energy created by earthquake tremors and other ground vibrations. The damper is formed from flat plates to simplify design and to minimize costs. The damper may be used in combination to absorb vibration energy impacting the structure from different directions.Type: GrantFiled: September 10, 1991Date of Patent: January 12, 1993Assignee: Kajima CorporationInventors: Takuju Kobori, Shunichi Yamada, Shigeru Ban, Koji Ishii, Isao Nishimura, Masatoshi Ishida, Kuniaki Sato, Yasuo Takenaka, Shozo Maeda, Jun Tagami
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Patent number: 5065555Abstract: An elasto-plastic damper is adapted to be used in a structure, such as a building and other facilities, for absorbing vibration energy created by earthquake tremors and other ground vibrations. The damper is a centrally bulged and generally cone-shaped hollow body of revolution so that its section modulus changes substantially porportional to a bending moment created in the damper body due to horizontal stresses, thus permitting a maximum degree of deformability. This elasto-plastic damper is compact in size and demonstrates a high degree of vibrational energy absorbability.Type: GrantFiled: November 21, 1989Date of Patent: November 19, 1991Assignee: Kajima CorporationInventors: Takuji Kobori, Shunichi Yamada, Shigeru Ban, Koji Ishii, Isao Nishimura, Masatoshi Ishida, Kuniaki Sato, Yasuo Takenaka, Shozo Maeda, Jun Tagami
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Patent number: 5046290Abstract: A safety monitoring device is provided for the use in an active seismic response and wind control system for exerting a control force, which restrains the vibration of a structure due to disturbances such as earthquake and wind, from an actuator in response to the above vibration. The safety monitoring device measures the work done of a seismic response control force and judges the work done of the seismic response control force to be positive or negative, so that whether or not the seismic response control is properly carried out by the actuator is judged. If any abnormality is found, a stop signal or the like is generated to stop the seismic response and wind control system, whereby the safety of the structure is ensured.Type: GrantFiled: February 20, 1990Date of Patent: September 10, 1991Assignee: Kajima CorporationInventors: Koji Ishit, Masao Iizuka, Jun Tagami, Toshikazu Yamada, Katsuyasu Sasaki, Yoshiki Ikeda
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Patent number: 5025599Abstract: A combination active and passive mass damping device to attenuate vibrations in a structure caused by seismic and/or wind forces. A mass is actively rendered vibratable by a hydraulic actuator and passively vibratable by use of springs. The device normally functions as an active mass damper, but, in the event of a power failure, is automatically converted by a failsafe means into a passive mass damping mode.Type: GrantFiled: January 16, 1990Date of Patent: June 25, 1991Assignee: Kajima CorporationInventors: Koji Ishii, Kozo Toyama, Jun Tagami
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Patent number: 5022201Abstract: A positive vibration suppression apparatus is disclosed, which suppresses vibrations of a building caused by earthquakes or winds by applying a control force to the building. The apparatus comprises a weight provided on the top of the building in a suspended form to reduce friction and an actuator provided between the weight and the building. The vibration suppression apparatus is controlled through sensing of the vibrations of the building and weight by a sensor, whereas for excessive vibrations of the building the vibrations of the weight are made close to the vibrations of the building to protect the apparatus, because the capacity of the vibration suppression apparatus is limited. Further, in an oil hydraulic system for obtaining a great control force, small and large size oil hydraulic pumps connected to respective small and large size electric motors and an accumulator are provided in parallel, so that the apparatus is warmed up at all time for oil hydraulic control with low power consumption.Type: GrantFiled: April 25, 1989Date of Patent: June 11, 1991Assignee: Kajima CorporationInventors: Takuji Kobori, Mitsuo Sakamoto, Toshikazu Yamada, Isao Nishimura, Koji Ishii, Jun Tagami
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Patent number: 4901486Abstract: An elasto-plastic damper is adapted to be used in a structure, such as a building and other facilities, for absorbing vibration energy created by earthquake tremors and other ground vibrations. The damper is a centrally bulged and generally cone-shaped hollow body of revolution so that its section modulus changes substantially proportional to a bending moment created in the damper body due to horizontal stresses, thus permitting a maximum degree of deformability. This elasto-plastic damper is compact in size and demonstrates a high degree of vibrational energy absorbability.Type: GrantFiled: December 31, 1987Date of Patent: February 20, 1990Assignee: Kajima CorporationInventors: Takuju Kobori, Shunichi Yamada, Shigeru Ban, Koji Ishii, Isao Nishimura, Masatoshi Ishida, Kuniaki Sato, Yasuo Takenaka, Shozo Maeda, Jun Tagami