Patents by Inventor Shigemitsu Tomita
Shigemitsu Tomita 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: 10883557Abstract: A damper includes a piston provided with a rod, and a housing storing the piston, and generates a braking force by an operation of the piston. The piston includes a seal member relative to an inner wall of the housing; and a slider contacting the inner wall of the housing with a predetermined frictional force. When the braking force is generated, the slider presses against the seal member, and a portion contacting the inner wall of the housing in the seal member deforms toward an outside of the housing. At an inner side of the portion contacting the inner wall of the housing in the seal member, a deformation control portion is provided, which suppresses the seal member from deforming toward an inside of the housing.Type: GrantFiled: August 31, 2017Date of Patent: January 5, 2021Assignee: NIFCO INC.Inventor: Shigemitsu Tomita
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Patent number: 10619692Abstract: A damper includes a piston provided with a rod, and a cylinder storing the piston, and generates a braking force by a movement or relative movement of the piston. The cylinder is provided with width-side wall portions and thickness-side wall portions, and a shape in a cross section of the cylinder in a direction orthogonal to a moving direction of the piston is flat. The cylinder has a connection portion on an open side thereof, and the connection portion bridges the width-side wall portions.Type: GrantFiled: May 11, 2016Date of Patent: April 14, 2020Assignee: NIFCO INC.Inventor: Shigemitsu Tomita
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Patent number: 10584758Abstract: A damper includes a piston provided with a rod, and a cylinder storing the piston, and generates a braking force by a movement or relative movement of the piston. The cylinder is provided with width-side wall portions and thickness-side wall portions, and a shape in a cross section of the cylinder in a direction orthogonal to a moving direction of the piston is flat. The cylinder has a connection portion on an open side thereof, and the connection portion bridges the width-side wall portions.Type: GrantFiled: May 11, 2016Date of Patent: March 10, 2020Assignee: NIFCO INC.Inventor: Shigemitsu Tomita
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Publication number: 20190249739Abstract: A damper includes a piston provided with a rod, and a housing storing the piston, and generates a braking force by an operation of the piston. The piston includes a seal member relative to an inner wall of the housing; and a slider contacting the inner wall of the housing with a predetermined frictional force. When the braking force is generated, the slider presses against the seal member, and a portion contacting the inner wall of the housing in the seal member deforms toward an outside of the housing. At an inner side of the portion contacting the inner wall of the housing in the seal member, a deformation control portion is provided, which suppresses the seal member from deforming toward an inside of the housing.Type: ApplicationFiled: August 31, 2017Publication date: August 15, 2019Inventor: Shigemitsu TOMITA
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Publication number: 20180149228Abstract: A damper includes a piston provided with a rod, and a cylinder storing the piston, and generates a braking force by a movement or relative movement of the piston. The cylinder is provided with width-side wall portions and thickness-side wall portions, and a shape in a cross section of the cylinder in a direction orthogonal to a moving direction of the piston is flat. The cylinder has a connection portion on an open side thereof, and the connection portion bridges the width-side wall portions.Type: ApplicationFiled: May 11, 2016Publication date: May 31, 2018Inventor: Shigemitsu TOMITA
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Patent number: 9850975Abstract: A damper includes a piston provided with a rod, and a housing storing the piston, and generates a braking force by an operation of the piston. The piston is provided with a seal member relative to an inner wall of the housing; and a slider provided slidably relative to the piston, and contacting the inner wall of the housing with a predetermined frictional force. When the braking force is generated, the slider presses against the seal member, and a portion contacting the inner wall of the housing in the seal member deforms outwardly toward the housing.Type: GrantFiled: December 17, 2014Date of Patent: December 26, 2017Assignee: NIFCO INC.Inventor: Shigemitsu Tomita
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Publication number: 20170002886Abstract: A damper includes a piston provided with a rod, and a housing storing the piston, and generates a braking force by an operation of the piston. The piston is provided with a seal member relative to an inner wall of the housing; and a slider provided slidably relative to the piston, and contacting the inner wall of the housing with a predetermined frictional force. When the braking force is generated, the slider presses against the seal member, and a portion contacting the inner wall of the housing in the seal member deforms outwardly toward the housing.Type: ApplicationFiled: December 17, 2014Publication date: January 5, 2017Applicant: NIFCO INC.Inventor: Shigemitsu TOMITA
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Patent number: 7874597Abstract: A movable member moved forward to a predetermined position can automatically move further forward. The mechanism includes first and second connecting members provided in the movable member and an immovable member. The second connecting member includes a catcher for catching the first connecting member and an urging device for urging the catcher. The catcher is arranged to be able to move or relatively move along a moving direction of the movable member, and held in a waiting position while receiving an urging force by the urging device toward a forward movement direction or backward movement direction of the movable member. When the movable member is moved to the predetermined position, the first connecting member is retained by the catcher of the second connecting member, and upon releasing of retention, the movable member is automatically moved forward to the stopped position by the urging force.Type: GrantFiled: March 23, 2007Date of Patent: January 25, 2011Inventors: Shigemitsu Tomita, Mikio Nezu
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Publication number: 20090277735Abstract: A rotary damper is provided so that air incorporated into a housing during assembly is, not excessively compressed, whereby a generation of a peculiar sound due to the air incorporated into the housing can be prevented even though the rotor rotates in both directions, and so that the air is stopped and captured in a fixed place whereby influence on the generated torque can be reduced, and irregularity of the torque can be reduced progressively. A rotary damper includes a housing (11, 51), silicon oil housed inside the housing (11, 51), a rotor 31 housed inside the housing (11, 51), and having a shaft member (32) projecting from the housing (11, 51) and having a resistance member (36) moving through the silicon oil (21) inside the housing (11, 51), and an O-ring (61) for preventing leakage of the silicon oil (21) from between the shaft member (32) and the housing (51). A circumferential groove (54) is provided on an inner face of the housing (51) facing the resistance member (36).Type: ApplicationFiled: December 27, 2006Publication date: November 12, 2009Inventors: Keiji Yamaguchi, Naoto Jinbo, Shigemitsu Tomita, Syunsuke Okabayashi, Ayako Kitakawa, Bunkin Tou, Yuki Hirano, Kazuyoshi Koizumi, Yoshihisa Takei
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Publication number: 20090090587Abstract: A speed responsive damper (10) comprises: a cylinder (11) in which a fluid is enclosed; a piston (13) that is slidably fitted into the cylinder and that has an orifice (19a) through which a fluid passes; a piston rod 14 whose one end is fixed to the piston and whose the other end is extended to the outside of the cylinder; and a slider 15 that is installed within the cylinder, and that moves in a predetermined range relative to the piston, and that adjusts an amount of the fluid passing through the piston, wherein the orifice is formed at a front end side of the piston. Therefore, explosive sound of air can be reduced, and swirl or slip of oil can be previously prevented, and a piston rod can be prevented from tilting.Type: ApplicationFiled: December 28, 2006Publication date: April 9, 2009Applicant: NIFCO INC.Inventor: Shigemitsu Tomita
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Patent number: 7393026Abstract: A lock mechanism holds a moving member on a main body immovably in a locked state and allows movement in an unlocked state. The lock mechanism includes a circulating cam groove formed on the main body or the moving member, and a trace member having an angle bracket shape with one and the other trace parts to sway on the main body or moving member. The one trace part circulates along the circulating cam groove in each approaching and moving away operation of the moving member, and locks the moving member in a state having coupled with the coupling part. A wall surface is formed on the main body or moving member to be disposed in a different position from the circulating cam groove so that the other trace part of the trace member is operable to contact the wall surface only in the locked state of the moving member.Type: GrantFiled: May 15, 2006Date of Patent: July 1, 2008Assignee: NIFCO Inc.Inventors: Yasuhiko Ikeda, Yasushi Ueki, Shigemitsu Tomita
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Publication number: 20070186481Abstract: A movable member moved forward to a predetermined position can automatically move further forward. The mechanism includes first and second connecting members provided in the movable member and an immovable member. The second connecting member includes a catcher for catching the first connecting member and an urging device for urging the catcher. The catcher is arranged to be able to move or relatively move along a moving direction of the movable member, and held in a waiting position while receiving an urging force by the urging device toward a forward movement direction or backward movement direction of the movable member. When the movable member is moved to the predetermined position, the first connecting member is retained by the catcher of the second connecting member, and upon releasing of retention, the movable member is automatically moved forward to the stopped position by the urging force.Type: ApplicationFiled: March 23, 2007Publication date: August 16, 2007Applicant: NIFCO INC.Inventors: Shigemitsu Tomita, Mikio Nezu
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Patent number: 7188718Abstract: A clutch device for transmitting drive power to a transmission-receiving member includes a main shaft; an input side rotating body; an output side rotating body; an inner sleeve body; an outer sleeve body; a braking device; a first coil spring; a first main connection part; a second main connection part; a first sub connection part; a second sub connection part; a first cam surface; a second cam surface; a first catching surface; a second catching surface; an outermost cylinder body; and a second coil spring. Non-transmitting condition can be surely set even if an input side rotational force is small.Type: GrantFiled: February 22, 2005Date of Patent: March 13, 2007Assignee: Nifco Inc.Inventors: Shigemitsu Tomita, Masanobu Kawamoto
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Publication number: 20060258220Abstract: A lock mechanism holds a moving member on a main body immovably in a locked state and allows movement in an unlocked state. The lock mechanism includes a circulating cam groove formed on the main body or the moving member, and a trace member having an angle bracket shape with one and the other trace parts to sway on the main body or moving member. The one trace part circulates along the circulating cam groove in each approaching and moving away operation of the moving member, and locks the moving member in a state having coupled with the coupling part. A wall surface is formed on the main body or moving member to be disposed in a different position from the circulating cam groove so that the other trace part of the trace member is operable to contact the wall surface only in the locked state of the moving member.Type: ApplicationFiled: May 15, 2006Publication date: November 16, 2006Applicant: NIFCO INC.Inventors: Yasuhiko Ikeda, Yasushi Ueki, Shigemitsu Tomita
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Patent number: 6986535Abstract: A latch device includes a movable member and a housing. The movable member is urged with an urging member to a position where a part of the movable member projects from the housing. When the movable member is pushed into the housing against a force of the urging member, a push-push type lock mechanism turns to a lock state and the movable member is locked at a push-in position. When the movable member in the push-in position is pushed into the housing again against the force of the urging member, the lock mechanism turns to an unlock state, so that the movable member is returned to the projecting position. The lock mechanism is provided on front and back surfaces of the movable member as well as on portions of the housing facing the front and back surfaces of the movable member.Type: GrantFiled: November 26, 2003Date of Patent: January 17, 2006Assignee: Nifco Inc.Inventors: Masanobu Kawamoto, Shigemitsu Tomita
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Publication number: 20050189191Abstract: A clutch device for transmitting drive power to a transmission-receiving member includes a main shaft; an input side rotating body; an output side rotating body; an inner sleeve body; an outer sleeve body; a braking device; a first coil spring; a first main connection part; a second main connection part; a first sub connection part; a second sub connection part; a first cam surface; a second cam surface; a first catching surface; a second catching surface; an outermost cylinder body; and a second coil spring. Non-transmitting condition can be surely set even if an input side rotational force is small.Type: ApplicationFiled: February 22, 2005Publication date: September 1, 2005Applicant: NIFCO INC.Inventors: Shigemitsu Tomita, Masanobu Kawamoto
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Publication number: 20040169377Abstract: A latch device includes a movable member and a housing. The movable member is urged with an urging member to a position where a part of the movable member projects from the housing. When the movable member is pushed into the housing against a force of the urging member, a push-push type lock mechanism turns to a lock state and the movable member is locked at a push-in position. When the movable member in the push-in position is pushed into the housing again against the force of the urging member, the lock mechanism turns to an unlock state, so that the movable member is returned to the projecting position. The lock mechanism is provided on front and back surfaces of the movable member as well as on portions of the housing facing the front and back surfaces of the movable member.Type: ApplicationFiled: November 26, 2003Publication date: September 2, 2004Applicant: NIFCO INC.Inventors: Masanobu Kawamoto, Shigemitsu Tomita
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Patent number: 6779640Abstract: A driving force transmitting clutch device includes a main shaft; a first rotor rotatable around the main shaft; a second rotor rotatable around the main shaft; an inner sleeve member attached to the second rotor for engaging the first rotor, and being movable in an axial direction of the main shaft; an outer sleeve member for receiving the inner sleeve member therein; and a coil spring for urging the inner sleeve member in a direction that the inner sleeve member engages the first rotor and the outer sleeve. When a movement of the outer sleeve is stopped, the outer sleeve moves the inner sleeve for releasing the inner sleeve from the first rotor and for releasing the inner sleeve from the outer sleeve.Type: GrantFiled: June 16, 2003Date of Patent: August 24, 2004Assignee: Nifco Inc.Inventor: Shigemitsu Tomita
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Publication number: 20040040811Abstract: A driving force transmitting clutch device includes a main shaft; a first rotor rotatable around the main shaft; a second rotor rotatable around the main shaft; an inner sleeve member attached to the second rotor for engaging the first rotor, and being movable in an axial direction of the main shaft; an outer sleeve member for receiving the inner sleeve member therein; and a coil spring for urging the inner sleeve member in a direction that the inner sleeve member engages the first rotor and the outer sleeve. When a movement of the outer sleeve is stopped, the outer sleeve moves the inner sleeve for releasing the inner sleeve from the first rotor and for releasing the inner sleeve from the outer sleeve.Type: ApplicationFiled: June 16, 2003Publication date: March 4, 2004Applicant: NIFCO INC.Inventor: Shigemitsu Tomita