Patents by Inventor Yataro Nagai
Yataro Nagai 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: 5448924Abstract: A behavior monitoring system for a rotary body is capable of monitoring displacement of the rotary body in a plurality of directions. The behavior monitoring system comprises an inclined surface formed on the rotary body and extending in oblique to a rotational axis, and a sensor means for detecting displacement of said inclined surface.Type: GrantFiled: March 23, 1993Date of Patent: September 12, 1995Assignee: Tanken Seiko Kabushiki KaishaInventors: Yataro Nagai, Yuji Yamauchi
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Patent number: 5067733Abstract: A mechanial seal having a split seal ring which is covered by a support ring over the outer face with a predetermined gap and is fastened in a circular shape by a O ring inserted in the predetermined gap. The split seal ring is easily assembled by a tool which includes a split ring body. The split ring body has a basic inner face contacting to a surface of a rotary shaft, an end face contacting to the end face of the split seal ring an a projection for inserting the O ring into the gap.Type: GrantFiled: May 18, 1990Date of Patent: November 26, 1991Assignee: Tanken Seiko Kabushiki KaishaInventors: Yataro Nagai, Mitsuyoshi Matsushita, Yuji Yamauchi
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Patent number: 5066134Abstract: The present invention relates to a fluid agitator which may stir fluid in a closed space without leakage of the fluid. The fluid agitator has a motive means and a bearing means installed in the closed space. In the fluid agitator employing a electric motor as the motive means, only the stator coil of the motor which is weak in its resistance against high temperatures and humid atmosphere is sealed in a sealing chamber. The sealing chamber may be provided with a cooling device to cool the inside thereof. The driving shaft of the motor is supported by a bearing having resistance to high temperatures and high humidity and is provided with an agitating blade. In the fluid agitator employing a turbine system as the motive means, a turbine chamber and a turbine blade are set in the closed space. A fluid supply is furnished to introduce fluid into the turbine chamber from outside of the closed space for driving and rotating the turbine blade.Type: GrantFiled: August 9, 1990Date of Patent: November 19, 1991Assignee: Tanken Seiko Kabushiki KaishaInventors: Hiroshi Ohbori, Yuji Yamauchi, Yataro Nagai, Sanjiro Nagai, Mitsuyoshi Matsushita
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Patent number: 4997192Abstract: A mechanical seal is, at a sliding surface and at its vicinty, formed of a pore-dispersed cemented carbide, so that the lubricating characteristics can be improved and the strength maintained by strictly stipulating the magnitude, shape, and volumetric ratio of the pores, such that pores are contained in an amount of 0.5 to 20 volume %, formed in at least one shape selected from the group of a substantialy spherical shape and a substantially cylindrical shape, the pores in the substantially spherical shape having an average diameter of 3 to 20 .mu.m, the pores in the substantially cylindrical shape having an average diameter of 3 to 20 .mu.m and an average length in the range from the average diameter up to 300 .mu.m, and that the pores are prevented from linking to each other to give a length greater than 2 mm.Type: GrantFiled: March 19, 1990Date of Patent: March 5, 1991Assignees: Tanken Seiko Kabushiki Kaisha, Nihon Tungsten Kabushiki KaishaInventors: Yataro Nagai, Mitsuyoshi Matsushita, Osamu Ishibashi, Kiyoshi Terasaki, Kei Tokumoto
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Patent number: 4982373Abstract: The present invention relates to a fluid agitator which may stir fluid in a closed space without leakage of the fluid. The fluid agitator has a motive means and a bearing means installed in the closed space.In the fluid agitator employing a electric motor as the motive means, only the stator coil of the motor which is weak in its resistance against high temperatures and humid atmosphere is sealed in a sealing chamber. The sealing chamber may be provided with a cooling device to cool the inside thereof. The driving shaft of the motor is supported by a bearing having resistance to high temperatures and high humidity and is provided with an agitating blade.In the fluid agitator employing a turbine system as the motive means, a turbine chamber and a turbine blade are set in the closed space. A fluid supply is furnished to introduce fluid into the turbine chamber from outside of the closed space for driving and rotating the turbine blade.Type: GrantFiled: October 17, 1989Date of Patent: January 1, 1991Assignee: Tanken Seiko Kabushiki KaishaInventors: Yataro Nagai, Sanjiro Nagai, Mitsuyoshi Matsushita, Hiroshi Ohbori, Yuji Yamauchi
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Patent number: 4925490Abstract: A mechanical seal is, at a sliding surface and at its vicinity, formed of a pore-dispersed cemented carbide, so that the lubricating characteristics can be improved and the strength maintained by strictly stipulating the magnitude, shape, and volumetric ratio of the pores, such that pores are contained in an amount of 0.5 to 20 volume %, formed in at least one shape selected from the group of a substantially spherical shape and a substantially cylindrical shape, the pores in the substantially spherical shape having an average diameter of 3 to 20 .mu.m, the pores in the substantially cylindrical shape having an average diameter of 3 to 20 .mu.m and an average length in the range from the average diameter up to 300 .mu.m, and that the pores are prevented from linking to each other to give a length greater than 2 mm.Type: GrantFiled: December 15, 1988Date of Patent: May 15, 1990Assignees: Tanken Seiko Kabushiki Kaisha, Nihon Tungsten Kabushiki KaishaInventors: Yataro Nagai, Mitsuyoshi Matsushita, Osamu Ishibashi, Kiyoshi Terasaki, Kei Tokumoto
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Patent number: 4545588Abstract: A mechanical seal for sealing a slurry liquid between a casing and a rotary shaft comprises a fixed seat ring; a rotatable slide ring in the casing and abutting against the seat ring to form a sealing face therebetween; a helical spring in the casing and surrounding the rotary shaft, and biassing the rotatable slide ring toward the seat ring; and a rotatable ring on the rotary shaft and rotatable with the rotary shaft and holding the spring at a predetermined position relative to the rotary shaft, the spring being interposed between the rotatable slide ring and the rotatable ring. A small space is provided between the casing and the rotatable ring and the rotatable ring has a helical projection on the outer surface thereof. The helical projection of the rotatable ring and the helical spring are directed such that upon rotation thereof a force is produced in a direction away from the sealing face and toward the interior of the casing.Type: GrantFiled: July 6, 1984Date of Patent: October 8, 1985Assignee: Tanken Seiko Corp.Inventors: Yataro Nagai, Kazuya Fukuoka
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Patent number: 4463957Abstract: A sealing device for a rotary shaft is provided with a spiral member having a determined pitch and a determined thickness on a rotating portion and/or a stationary portion corresponding to the rotating portion. The spiral member may be provided via a shaft sleeve, or may be directly attached on a rotating portion and/or a stationary portion corresponding to the rotating portion. The spiral member may be in advance shaped in a spiral form, or may be a string-like flexible member which may be shaped in a spiral form.Type: GrantFiled: July 1, 1981Date of Patent: August 7, 1984Assignee: Tanken Seiko Corp.Inventors: Yataro Nagai, Yoshiro Imai