Patents by Inventor Isao Sendo
Isao Sendo 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: 9285054Abstract: A control valve according to an embodiment includes a guide member of a cylindrical shape extending coaxially with a valve hole, a valve element of a bottomed cylindrical shape for opening and closing a valve section such that the valve element touches and leaves the valve hole, and a pressure-canceling structure for canceling out at least part of pressure acting on the valve element by introducing a working fluid into a back pressure chamber via a leak passage, the pressure-canceling structure including the back pressure chamber, surrounded by the valve element and the guide member, and the leak passage communicating between the valve hole and the back pressure chamber. A sliding portion and a spacing are formed in an overlapped portion which is a region overlapped by the valve element and the guide member.Type: GrantFiled: September 28, 2012Date of Patent: March 15, 2016Assignee: TGK CO., LTD.Inventors: Michio Matsumoto, Isao Sendo, Masaaki Tonegawa
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Publication number: 20150233487Abstract: In an electromagnetic valve, a solenoid includes a cylindrical bobbin, an electromagnetic coil wound around the bobbin, a yoke that surrounds the electromagnetic coil, a fixed iron core that is fixed, coaxially with the bobbin, to the yoke, and a movable iron core arranged counter to the fixed iron core inside the bobbin in a direction of axis line. The movable iron core including a first iron core that is inserted into the bobbin such that the first iron core is displaceable in the direction of axis line, and a second iron core formed integrally with the first iron core in a position opposite to the fixed iron core, the second iron core being arranged counter to an end surface of the yoke outside the bobbin in the direction of axis line.Type: ApplicationFiled: February 10, 2015Publication date: August 20, 2015Inventors: Michio Matsumoto, Isao Sendo
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Publication number: 20130082199Abstract: A control valve according to an embodiment includes a guide member of a cylindrical shape extending coaxially with a valve hole, a valve element of a bottomed cylindrical shape for opening and closing a valve section such that the valve element touches and leaves the valve hole, and a pressure-canceling structure for canceling out at least part of pressure acting on the valve element by introducing a working fluid into a back pressure chamber via a leak passage, the pressure-canceling structure including the back pressure chamber, surrounded by the valve element and the guide member, and the leak passage communicating between the valve hole and the back pressure chamber. A sliding portion and a spacing are formed in an overlapped portion which is a region overlapped by the valve element and the guide member.Type: ApplicationFiled: September 28, 2012Publication date: April 4, 2013Inventors: Michio Matsumoto, Isao Sendo, Masaaki Tonegawa
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Publication number: 20060196201Abstract: To provide an expansion valve capable of enhancing manufacturing efficiency of a body and yield from material, thereby reducing manufacturing costs thereof. According to the expansion valve of the present invention, a body is formed by die casting an aluminum alloy, and hence even when the body has a complicated shape, it is possible to easily manufacture the body. Further, even a valve seat, which is difficult to form by extrusion, can be formed integrally with the body, and hence the manufacturing efficiency of the body can be enhanced. Furthermore, component parts, such as the valve seat and the like, conventionally formed by cutting, are also formed integrally with the body by die casting, and hence it is possible to enhance yield from material to reduce manufacturing costs of the expansion valve.Type: ApplicationFiled: March 3, 2006Publication date: September 7, 2006Applicant: TGK CO., LTD.Inventors: Isao Sendo, Michio Matsumoto, Takeshi Watanabe, Takanao Kumakura
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Publication number: 20040007015Abstract: The object of the present invention is to provide an expansion valve that suppresses noise generated when an air conditioner is started, and achieves saving of driving force. The stroke of a valve element is set such that refrigerant flows at a flow rate 1.0 to 1.4 times the flow rate corresponding to the set tonnage. This limits the valve lift of the valve in the fully open state during start-up such that it provides a flow rate of refrigerant only 1.0 to 1.4 times the flow rate corresponding to the set tonnage. This prevents an unnecessary and excessive amount of refrigerant from flowing, whereby it is possible to reduce flow noise of refrigerant during start-up. Further, since the excessive amount of flow of refrigerant is reduced, it is possible to achieve saving of driving force.Type: ApplicationFiled: July 10, 2003Publication date: January 15, 2004Applicant: TGK CO., LTD.Inventors: Isao Sendo, Tomohiro Yuasa
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Patent number: 6484950Abstract: To provide an expansion valve which permits both the assembling cost and the cost of parts to be effectively reduced by a large margin and thus is highly economical. A high-pressure refrigerant pipe, a valve casing and a low-pressure refrigerant pipe are previously formed integrally with an evaporator. At the time of assembling, an expansion valve unit having a minimum function to serve as an expansion valve is inserted into the valve casing and fixed thereto by a clip, and a distal end portion of a temperature sensing cylinder is fixed to an outlet pipe of the evaporator, thereby constructing an expansion valve. No special joints are required to connect the expansion valve unit to the high-pressure and low-pressure refrigerant pipes, and therefore, the cost of parts can be cut down.Type: GrantFiled: November 6, 2001Date of Patent: November 26, 2002Assignee: TGK Co. Ltd.Inventors: Hisatoshi Hirota, Isao Sendo, Kuniharu Baba, Takeshi Kaneko
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Publication number: 20020060250Abstract: To provide an expansion valve which permits both the assembling cost and the cost of parts to be effectively reduced by a large margin and thus is highly economical. A high-pressure refrigerant pipe, a valve casing and a low-pressure refrigerant pipe are previously formed integrally with an evaporator. At the time of assembling, an expansion valve unit having a minimum function to serve as an expansion valve is inserted into the valve casing and fixed thereto by a clip, and a distal end portion of a temperature sensing cylinder is fixed to an outlet pipe of the evaporator, thereby constructing an expansion valve. No special joints are required to connect the expansion valve unit to the high-pressure and low-pressure refrigerant pipes, and therefore, the cost of parts can be cut down.Type: ApplicationFiled: November 6, 2001Publication date: May 23, 2002Applicant: TGK Co., Ltd.Inventors: Hisatoshi Hirota, Isao Sendo, Kuniharu Baba, Takeshi Kaneko
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Patent number: 6352207Abstract: In an expansion valve having a control mechanism with an airtight chamber, the airtight chamber is sealed by a steel ball joined into a filling hole in a metallic wall of the airtight chamber. The steel ball is fixed by resistance welding for sealing the filling hole. The diameter ratio between the inner diameter of the filling hole and the outer diameter of the spherical surface of the steel ball is set to a value falling in a range from 0.6 to 0.85.Type: GrantFiled: September 22, 2000Date of Patent: March 5, 2002Assignee: TGK Co., Ltd.Inventors: Satoshi Kawakami, Isao Sendo, Tatsuo Ito, Shigeyoshi Ueno
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Patent number: 6296194Abstract: An expansion valve adapted to achieve a stable operation in case of variations of the pressure of a high-pressure refrigerant is actuated by a power element transmitting an opening force to a valve body via a rod located between the power element and the power body by applying couple forces to the rod and generating a retarding force for the rod while the rod is guided in the direction of its shaft lineType: GrantFiled: January 10, 2000Date of Patent: October 2, 2001Assignee: TGK Co., Ltd.Inventors: Hisatoshi Hirota, Shinji Saeki, Isao Sendo, Masaichi Kawahata, Toshiyuki Shiota, Takashi Kobayashi
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Patent number: 5127237Abstract: An expansion valve (10) for controlling the flow rate of refrigerant supplied to an evaporator (1) of a refrigerating system comprises a temperature-sensing chamber (30) entirely provided within the housing (11) of said expansion valve in a low pressure passage (12) thereof. Said passage (13) is connected to the outlet of said evaporator (1) and the inlet of a compressor (2), for converting a temperature change into a pressure change in order to actuate a valve mechanism (20) in response to a rise and lowering in pressure of said temperature-sensing chamber to open and close a passage (13) for adiabatic expansion of the refrigerant. Said temperature-sensing chamber (30) contains a sealed gas charge and an adsorbent material (35) for adsorbing and releasing said gaseous medium in accordance with temperature changes sensed.Type: GrantFiled: December 3, 1990Date of Patent: July 7, 1992Assignees: TGK Co. Ltd., Deutsche Controls GmbHInventors: Isao Sendo, Tokumi Tsuquwa
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Patent number: D415564Type: GrantFiled: April 1, 1997Date of Patent: October 19, 1999Assignees: TGK Co., Ltd., Deutsche Controls GmbHInventors: Isao Sendo, Hiroaki Masuhara