Patents by Inventor Yuzuru Tamura
Yuzuru Tamura 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: 6565066Abstract: A gate valve includes: a valve plate; a valve rod which the valve plate is fixed to and is supported to be able to tilt; a seal bellows and a dust sealing portion; a stopper member; a tilting cam mechanism which converts supplied straight moving force into tilting force, and tilts the valve rod of which the straight movement is restricted at a closed position in the direction where the valve plate 2 seals an aperture; a seal-releasing cam mechanism which tilts the valve rod in the direction to release the sealing of the valve plate; and an air cylinder as an actuator which supplies the straight movement force for the tilting cam mechanism and the seal-releasing cam mechanism.Type: GrantFiled: April 23, 2001Date of Patent: May 20, 2003Assignees: Eagle Industry Co., Ltd., NOK CorporationInventors: Yoshio Osawa, Koichi Mori, Yuzuru Tamura
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Patent number: 6454241Abstract: A gate valve in which the structure is simplified and inexpensive, movement of a valve body is smooth and high in speed, a force of inclination moving the valve body is strong, and a sealing property of an opening portion can be improved. The gate valve has a valve body capable of sealing the opening portion; a valve rod to which the valve body is fixed; a roller rotatably provided on the other end portion of the valve rod; a roller receiving member having a first holding portion for holding the roller when the valve rod moves the roller straight, an inclined surface for inclining the valve rod, and a second holding portion for holding the roller when the valve rod is inclined up to a predetermined angle; a driving means for moving the roller receiving member straight; and stoppers limiting the straight movement of the valve rod at predetermined positions at which the valve body closes the opening portion. This gate valve is preferably driven by the cylinder apparatus.Type: GrantFiled: August 23, 2001Date of Patent: September 24, 2002Assignee: NOK CorporationInventors: Yuzuru Tamura, Isamu Kinno
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Publication number: 20020000531Abstract: A gate valve includes: a valve plate 2; a valve rod 6 which the valve plate 2 is fixed to and is supported to be able to tilt; a seal bellows 10 and a dust sealing portion 90; a stopper member 12 as a restriction means; a tilting cam mechanism 31 which converts supplied straight moving force into tilting force, and tilts the valve rod 6 of which the straight movement is restricted at a closed position in the direction where the valve plate 2 seals an aperture 51; a seal-releasing cam mechanism 70 which tilts the valve rod 6 in the direction to release the sealing of the valve plate 2; and an air cylinder 60 as an actuating means which supplies the straight moving force for the tilting cam mechanism 31 and the seal-releasing cam mechanism 70.Type: ApplicationFiled: April 23, 2001Publication date: January 3, 2002Inventors: Yoshio Osawa, Koichi Mori, Yuzuru Tamura
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Patent number: 6283445Abstract: A gate valve in which the structure is simplified and inexpensive, movement of a valve body is smooth and high in speed, a force of inclination moving the valve body is strong, and a sealing property of an opening portion can be improved. The gate valve has a valve body capable of sealing the opening portion; a valve rod to which the valve body is fixed; a roller rotatably provided on the other end portion of the valve rod; a roller receiving member having a first holding portion for holding the roller when the valve rod moves the roller straight, an inclined surface for inclining the valve rod, and a second holding portion for holding the roller when the valve rod is inclined up to a predetermined angle; a driving means for moving the roller receiving member straight; and stoppers limiting the straight movement of the valve rod at predetermined positions at which the valve body closes the opening portion. This gate valve is preferably driven by the cylinder apparatus.Type: GrantFiled: February 28, 2000Date of Patent: September 4, 2001Assignee: NOK CorporationInventors: Yuzuru Tamura, Isamu Kinno
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Patent number: 6045117Abstract: A gate valve in which the structure is simplified and inexpensive, movement of a valve body is smooth and high in speed, a force of inclination moving the valve body is strong, and a sealing property of an opening portion can be improved. The gate valve has a valve body capable of sealing the opening portion; a valve rod to which the valve body is fixed; a roller rotatably provided on the other end portion of the valve rod; a roller receiving member having a first holding portion for holding the roller when the valve rod moves the roller straight, an inclined surface for inclining the valve rod, and a second holding portion for holding the roller when the valve rod is inclined up to a predetermined angle; a driving means for moving the roller receiving member straight; and stoppers limiting the straight movement of the valve rod at predetermined positions at which the valve body closes the opening portion. This gate valve is preferably driven by the cylinder apparatus.Type: GrantFiled: March 30, 1999Date of Patent: April 4, 2000Assignee: NOK CorporationInventors: Yuzuru Tamura, Isamu Kinno
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Patent number: 5934646Abstract: A gate valve in which the structure is simplified and inexpensive, movement of a valve body is smooth and high in speed, a force of inclination moving the valve body is strong, and a sealing property of an opening portion can be improved. The gate valve has a valve body capable of sealing the opening portion; a valve rod to which the valve body is fixed; a roller rotatably provided on the other end portion of the valve rod; a roller receiving member having a first holding portion for holding the roller when the valve rod moves the roller straight, an inclined surface for inclining the valve rod, and a second holding portion for holding the roller when the valve rod is inclined up to a predetermined angle; a driving means for moving the roller receiving member straight; and stoppers limiting the straight movement of the valve rod at predetermined positions at which the valve body closes the opening portion. This gate valve is preferably driven by the cylinder apparatus.Type: GrantFiled: April 6, 1998Date of Patent: August 10, 1999Assignee: Nok CorporationInventors: Yuzuru Tamura, Isamu Kinno