Patents by Inventor Yasuaki Fujita
Yasuaki Fujita 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: 8083297Abstract: The present invention relates to a coreless rubber crawler traveling device in which spring characteristics are achieved by reducing a contact area of a wheel-rolling contact surface on an inner peripheral surface of a rubber elastic body with an outer surface of a tracker roller. A coreless rubber crawler comprises an endless rubber elastic body, main cord rows embedded in the rubber elastic body in a longitudinal direction of the rubber elastic body, rubber projections formed on the inner peripheral surface of the rubber elastic body at uniform pitches, and rubber lugs formed on the outer peripheral surface of the rubber elastic body. In the coreless rubber crawler traveling device, a tracker roller, which is provided at the side of a vehicle body and which straddles the right and left sides of each of the rubber projections in the widthwise direction, rolls in such a manner that an outer surface of the tracker roller comes into contact with the inner peripheral surface of the rubber elastic body.Type: GrantFiled: January 28, 2005Date of Patent: December 27, 2011Assignee: Bridgestone CorporationInventor: Yasuaki Fujita
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Patent number: 7695077Abstract: To improve the lifespan of a rubber crawler by reducing as much as possible cracks due to bending at the time of wraparound. Bending deformation no longer becomes concentrated at a specific place because bending rigidities at the time of wraparound are not so different from each other overall. For that reason, the occurrence of cracks can be reduced. As a result, the lifespan of the rubber crawler is improved.Type: GrantFiled: December 2, 2005Date of Patent: April 13, 2010Assignee: Bridgestone CorporationInventor: Yasuaki Fujita
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Patent number: 7325888Abstract: A rubber crawler having a very good straight driving property is obtained by modifying a method of embedding bias cords in a rubber crawler and neutralizing shear stresses caused by tensile load of bent portions of the crawler when the crawler is entrained about a vehicle main body. The rubber crawler is comprised of an endless rubber elastic body, a main cord row, two layers of bias cords having opposite angles of inclination, guide projections, and a lug. The bias cords of the first layer at a side near the main cord row are embedded over a region having substantially the same transverse dimension as that of the main cord row, at a fixed angle of inclination, and the bias cords of the second layer are divided into two sections, covering a region having substantially the same transverse dimension as that of the bias cords of the first layer other than a portions corresponding to the guide projections.Type: GrantFiled: May 27, 2004Date of Patent: February 5, 2008Assignee: Bridgestone CorporationInventors: Yasuaki Fujita, Shuichi Matsuo
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Publication number: 20080007118Abstract: To improve the lifespan of a rubber crawler by reducing as much as possible cracks due to bending at the time of wraparound. Bending deformation no longer becomes concentrated at a specific place because bending rigidities at the time of wraparound are not so different from each other overall. For that reason, the occurrence of cracks can be reduced. As a result, the lifespan of the rubber crawler is improved.Type: ApplicationFiled: December 2, 2005Publication date: January 10, 2008Applicant: Bridgestone CorporationInventor: Yasuaki Fujita
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Publication number: 20070252433Abstract: The present invention relates to a coreless rubber crawler traveling device in which spring characteristics are achieved by reducing a contact area of a wheel-rolling contact surface on an inner peripheral surface of a rubber elastic body with an outer surface of a tracker roller. A coreless rubber crawler comprises an endless rubber elastic body, main cord rows embedded in the rubber elastic body in a longitudinal direction of the rubber elastic body, rubber projections formed on the inner peripheral surface of the rubber elastic body at uniform pitches, and rubber lugs formed on the outer peripheral surface of the rubber elastic body. In the coreless rubber crawler traveling device, a tracker roller, which is provided at the side of a vehicle body and which straddles the right and left sides of each of the rubber projections in the widthwise direction, rolls in such a manner that an outer surface of the tracker roller comes into contact with the inner peripheral surface of the rubber elastic body.Type: ApplicationFiled: January 28, 2005Publication date: November 1, 2007Inventor: Yasuaki Fujita
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Publication number: 20060232129Abstract: A rubber crawler having a very good straight driving property is obtained by modifying a method of embedding bias cords in a rubber crawler and neutralizing shear stresses caused by tensile load of bent portions of the crawler when the crawler is entrained about a vehicle main body. The rubber crawler is comprised of an endless rubber elastic body, a main cord row, two layers of bias cords having opposite angles of inclination, guide projections, and a lug. The bias cords of the first layer at a side near the main cord row are embedded over a region having substantially the same transverse dimension as that of the main cord row, at a fixed angle of inclination, and the bias cords of the second layer are divided into two sections, covering a region having substantially the same transverse dimension as that of the bias cords of the first layer other than a portions corresponding to the guide projections.Type: ApplicationFiled: May 27, 2004Publication date: October 19, 2006Inventors: Yasuaki Fujita, Shuichi Matsuo
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Patent number: 6818167Abstract: In a method of manufacturing a rubber crawler through a first vulcanization step and a second vulcanization step using an upper mold, a middle mold and a lower mold, at least the middle mold is heated at each vulcanization step, and a vulcanizing circumferential length at the first vulcanization step is made longer than that at the second vulcanization step, and the second vulcanization step is carried out at a state that each end portion of the crawler part formed at the first vulcanization step is positioned by at least one pitch rate in each mold at the second vulcanization step and the distance between the upper and lower molds is made larger than that in the first vulcanization step.Type: GrantFiled: March 26, 2003Date of Patent: November 16, 2004Assignee: Bridgestone CorporationInventor: Yasuaki Fujita
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Patent number: 6767493Abstract: It is to provide a method of manufacturing a rubber crawler which enhances a degree of freedom in the handling in a vulcanization-shaping of a crawler part and largely improves vulcanization shapability and operability and facilitates an arrangement of an auxiliary device or the like.Type: GrantFiled: November 8, 2002Date of Patent: July 27, 2004Assignee: Bridgestone CorporationInventor: Yasuaki Fujita
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Publication number: 20030168777Abstract: In a method of manufacturing a rubber crawler through a first vulcanization step and a second vulcanization step using an upper mold, a middle mold and a lower mold, at least the middle mold is heated at each vulcanization step, and a vulcanizing circumferential length at the first vulcanization step is made longer than that at the second vulcanization step, and the second vulcanization step is carried out at a state that each end portion of the crawler part formed at the first vulcanization step is positioned by at least one pitch rate in each mold at the second vulcanization step and the distance between the upper and lower molds is made larger than that in the first vulcanization step.Type: ApplicationFiled: March 26, 2003Publication date: September 11, 2003Applicant: BRIDGESTONE CORPORATIONInventor: Yasuaki Fujita
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Publication number: 20030141630Abstract: It is to provide a method of manufacturing a rubber crawler which enhances a degree of freedom in the handling in a vulcanization-shaping of a crawler part and largely improves vulcanization shapability and operability and facilitates an arrangement of an auxiliary device or the like.Type: ApplicationFiled: November 8, 2002Publication date: July 31, 2003Inventor: Yasuaki Fujita
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Patent number: D514133Type: GrantFiled: June 3, 2004Date of Patent: January 31, 2006Assignee: Bridgestone CorporationInventor: Yasuaki Fujita