Patents by Inventor Osamu Gokita
Osamu Gokita 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).
-
Patent number: 9404535Abstract: A sliding bearing assembly for joints of construction equipment can be provided, in which production cost is reduced by decreasing the used amount of Cu and sulfides having high fixability to a matrix are dispersed. The sliding bearing assembly for joints of construction equipment, includes at least a shaft and a bush made of an iron-based sintered material which functions as a sliding bearing, in which the bush has the overall composition of, by mass %, 0.1 to 10% of Cu, 0.2 to 1.2% of C, 0.03 to 0.9% of Mn, 0.36 to 1.68% of S, and the balance of Fe and inevitable impurities, a metal structure has pores dispersed in a matrix mainly including a martensite structure and sulfide particles precipitated and dispersed, and the sulfide particles are dispersed at 1 to 7 volume % in the matrix.Type: GrantFiled: September 24, 2013Date of Patent: August 2, 2016Assignee: HITACHI CHEMICAL COMPANY, LTD.Inventors: Hidekazu Tokushima, Hideaki Kawata, Daisuke Fukae, Osamu Mawatari, Hideki Akita, Makoto Sugaya, Akiko Satou, Osamu Gokita, Shigeyuki Sakurai
-
Publication number: 20150240870Abstract: A sliding bearing assembly for joints of construction equipment can be provided, in which production cost is reduced by decreasing the used amount of Cu and sulfides having high fixability to a matrix are dispersed. The sliding bearing assembly for joints of construction equipment, includes at least a shaft and a bush made of an iron-based sintered material which functions as a sliding bearing, in which the bush has the overall composition of, by mass %, 0.1 to 10 % of Cu, 0.2 to 1.2% of C, 0.03 to 0.9% of Mn, 0.36 to 1.68% of S, and the balance of Fe and inevitable impurities, a metal structure has pores dispersed in a matrix mainly including a martensite structure and sulfide particles precipitated and dispersed, and the sulfide particles are dispersed at 1 to 7 volume % in the matrix.Type: ApplicationFiled: September 24, 2013Publication date: August 27, 2015Inventors: Hidekazu Tokushima, Hideaki Kawata, Daisuke Fukae, Osamu Mawarari, Hideki Akita, Makoto Sugaya, Akiko Satou, Osamu Gokita, Shigeyuki Sakurai
-
Publication number: 20150016761Abstract: The invention pertains to a bearing device used for a connecting part of a construction machine. The bearing device has: a boom having a boss part; an arm having left and right brackets that sandwich the boss part from the left and right sides thereof; a bush that is retained by an inner peripheral side of the boss part; a sealing that is disposed between the bush and the left and right brackets and that prevents a lubricant from leaking out of the bush; a thrust plate inserted between the left and right brackets and the boss part; and a coupling pin that penetrates and is inserted through the left and right brackets and the bush. The thrust plate has a partially cut out annular shape and an angle of a cut-out portion in the circumferential direction is less than 180° at an inner peripheral portion.Type: ApplicationFiled: October 18, 2012Publication date: January 15, 2015Inventors: Hideki Akita, Shigeyuki Sakurai, Akiko Satou, Osamu Gokita
-
Patent number: 8821022Abstract: Provided are a novel sliding bearing and a construction machine provided with same, the sliding bearing being capable of maintaining an excellent sliding performance over a long period of time and exhibiting an excellent strength. A sliding bearing includes at least a brush and a shaft part, the shaft part being provided with a grease feeding pathway for feeding grease from the exterior to the sliding surfaces of the shaft part and the bush, the bush being formed from a porous sintered metal, and a decomposition catalyst being adhered to the sliding surface of the bush.Type: GrantFiled: December 5, 2011Date of Patent: September 2, 2014Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Hideki Akita, Osamu Gokita, Shigeyuki Sakurai, Yasuchika Nagai
-
Patent number: 8596870Abstract: A dust seal is provided with a tubular fitting portion, a bush end surface abutting portion, a lip portion and a sealing projection integrally formed. The sealing projection is formed to project in an axially opposite direction to the lip portion from a radial inner section of the bush end surface abutting portion and abuts against a chamfered portion of a bush in such a manner as to overlap the chamfered portion. Therefore, at the time of supplying lubricant between the bush and a connecting pin, the sealing projection can prevent a part of the lubricant from entering between an end surface of the bush and the bush end surface abutting portion of the dust seal to maintain a sealed state therebetween. In consequence, the dust seal can be stably held on the inner peripheral side of a boss member, preventing the pulling-out of the dust seal.Type: GrantFiled: March 26, 2009Date of Patent: December 3, 2013Assignees: Hitachi Construction Machinery Co., Ltd., Nippon Valqua Industries, Ltd.Inventors: Hideki Akita, Osamu Gokita, Akiko Sato, Eiji Negoro, Tomiyoshi Yamazaki
-
Publication number: 20130279835Abstract: Provided are a novel sliding bearing and a construction machine provided with same, the sliding bearing being capable of maintaining an excellent sliding performance over a long period of time and exhibiting an excellent strength. A sliding bearing (100) includes at least a brush (10) and a shaft part (20), the shaft part (20) being provided with a grease feeding pathway (70) for feeding grease (G) from the exterior to the sliding surfaces of the shaft part (20) and the bush (10), the bush (10) being formed from a porous sintered metal, and a decomposition catalyst (S) being adhered to the sliding surface of the bush (10).Type: ApplicationFiled: December 5, 2011Publication date: October 24, 2013Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Hideki Akita, Osamu Gokita, Shigeyuki Sakurai, Yasuchika Nagai
-
Patent number: 8430593Abstract: A two-member connection structure is provided with a boom to be arranged on a hydraulic excavator, an arm arranged inboard the boom, outboard bushings and inboard bushings press-fit in pin holes of the boom and arm, respectively. A connector pin is inserted in holes of the outboard bushings and holes of the inboard bushings to connect the boom and arm as two members for relative pivotal movement. Flange portions are integrally arranged on opposite end portions of the connector pin, respectively, to restrict slip-out of the connector pin. The connector pin is arranged rotatably relative to both of the outboard bushings and the inboard bushings, and the flange portions are arranged slidably relative to outboard end faces of the corresponding outboard bushings without being prevented from rotation relative to the boom.Type: GrantFiled: October 2, 2008Date of Patent: April 30, 2013Assignee: Hitachi Construction Machinery Co., Ltd.Inventor: Osamu Gokita
-
Patent number: 8376619Abstract: Grease for a slide bearing, which can suppress unusual noise attributable to a slip caused between a shaft and a bearing when a machine is stopped. In slide bearing grease 24 supplied to between a slide bearing 16 formed of a porous sintered alloy-made bushing having pores 30 impregnated with lubricating oil 31 and a shaft 22 inserted in the slide bearing 16 and supported to be slidingly rotatable in the circumferential direction, the slide bearing grease 24 employs base oil having dynamic viscosity of 10-70 mm2/s at 40° C. and exuding under a load of the shaft 22 to form an oil film 35 between the slide bearing 16 and the shaft 22.Type: GrantFiled: January 9, 2012Date of Patent: February 19, 2013Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Hideki Akita, Osamu Gokita, Minoru Fujisaki, Hajime Maezawa, Nobuo Yanaka, Hiroshi Nishimura, Hideyuki Fujiya
-
Publication number: 20120106881Abstract: Grease for a slide bearing, which can suppress unusual noise attributable to a slip caused between a shaft and a bearing when a machine is stopped. In slide bearing grease 24 supplied to between a slide bearing 16 formed of a porous sintered alloy-made bushing having pores 30 impregnated with lubricating oil 31 and a shaft 22 inserted in the slide bearing 16 and supported to be slidingly rotatable in the circumferential direction, the slide bearing grease 24 employs base oil having dynamic viscosity of 10-70 mm2/s at 40° C. and exuding under a load of the shaft 22 to form an oil film 35 between the slide bearing 16 and the shaft 22.Type: ApplicationFiled: January 9, 2012Publication date: May 3, 2012Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Hideki Akita, Osamu Gokita, Minoru Fujisaki, Hajime Maezawa, Nobuo Yanaka, Hiroshi Nishimura, Hideyuki Fujiya
-
Publication number: 20110152139Abstract: Grease for a slide bearing, which can suppress unusual noise attributable to a slip caused between a shaft and a bearing when a machine is stopped. In slide bearing grease 24 supplied to between a slide bearing 16 formed of a porous sintered alloy-made bushing having pores 30 impregnated with lubricating oil 31 and a shaft 22 inserted in the slide bearing 16 and supported to be slidingly rotatable in the circumferential direction, the slide bearing grease 24 employs base oil having dynamic viscosity of 10-70 mm2/s at 40° C. and exuding under a load of the shaft 22 to form an oil film 35 between the slide bearing 16 and the shaft 22.Type: ApplicationFiled: March 7, 2011Publication date: June 23, 2011Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Hideki Akita, Osamu Gokita, Minoru Fujisaki, Hajime Maezawa, Nobuo Yanaka, Hiroshi Nishimura, Hideyuki Fujiya
-
Publication number: 20110111995Abstract: In this grease composition, a grease produced by mixing at least one base oil selected from a mineral oil-type lubricant base oil, a synthetic lubricant base oil, and a biodegradable lubricant base oil with a thickener is compounded with a wax and water, and an additive such as a surfactant and a defoamer is optionally compounded therewith. A soap containing a calcium sulfonate complex is used as the thickener. A carnauba wax is preferably used as the wax. Since this grease composition is mainly composed of a grease and a wax, the grease composition extremely facilities its removal operation after application, is environmentally friendly, and has extremely excellent anti-corrosion performance. When the grease composition is used by being applied to a base material of an object to be welded, an effect of preventing the adhesion of welding spatters can be obtained.Type: ApplicationFiled: October 27, 2008Publication date: May 12, 2011Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Hideki Akita, Shigeyuki Sakurai, Osamu Gokita, Shinichi Sekido, Masafumi Senzaki, Yasuchika Nagai, Mitsuhiro Yamamoto, Tooru Nakajima, Mitsuru Komachi, Hiroshi Nishimura, Jun Araki
-
Publication number: 20110019949Abstract: A dust seal is provided with a tubular fitting portion, a bush end surface abutting portion, a lip portion and a sealing projection integrally formed. The sealing projection is formed to project in an axially opposite direction to the lip portion from a radial inner section of the bush end surface abutting portion and abuts against a chamfered portion of a bush in such a manner as to overlap the chamfered portion. Therefore, at the time of supplying lubricant between the bush and a connecting pin, the sealing projection can prevent a part of the lubricant from entering between an end surface of the bush and the bush end surface abutting portion of the dust seal to maintain a sealed state therebetween. In consequence, the dust seal can be stably held on the inner peripheral side of a boss member, preventing the pulling-out of the dust seal.Type: ApplicationFiled: March 26, 2009Publication date: January 27, 2011Applicants: HITACHI CONSTRUCTION MACHINERY CO., LTD., NIPPON VALQUA INDUSTRIES, LTD.Inventors: Hideki Akita, Osamu Gokita, Akiko Sato, Eiji Negoro, Tomiyoshi Yamazaki
-
Publication number: 20110008142Abstract: A working machine is provided with a front working mechanism. The front working mechanism includes a first working element, a second working element and a hydraulic cylinder. The hydraulic cylinder is connected at a forward end portion thereof to the second working element and at a rearward end portion thereof to the first working element, and is constructed pivotable relative to the second working element within a predetermined range of work angles. The working machine is provided with a pivotal movement restraining device for allowing the hydraulic cylinder to pivot within the predetermined range of work angles while the hydraulic cylinder is connected to the second working element but for restraining the hydraulic cylinder from pivoting beyond the predetermined range of work angles in a direction away from the first working element while the second working element is detached from the hydraulic cylinder.Type: ApplicationFiled: July 8, 2010Publication date: January 13, 2011Applicant: Hitachi Construction Machinery Co., Ltd.Inventor: Osamu GOKITA
-
Publication number: 20100209181Abstract: [Problem] To provide a two-member connection structure for a working machine, which can hold outboard members and their corresponding inboard members for relative pivotal movement without arrangement of stoppers for restricting rotation of flange portions and a connector pin. [Solution] A two-member connection structure is provided with an boom 4 to be arranged on a hydraulic excavator, an arm 5 arranged inboard the boom 4, outboard bushings 6 and inboard bushings 7 press-fitted in pin holes 4a, 5a of the boom 4 and arm 5, respectively, a connector pin 8 inserted in holes 6a of the outboard bushings 6 and holes 7a of the inboard bushings 7 to connect the boom 4 and arm 5 as two members for relative pivotal movement, and flange portions 9 integrally arranged on opposite end portions of the connector pin 8, respectively, to restrict slip-out of the connector pin 8.Type: ApplicationFiled: October 2, 2008Publication date: August 19, 2010Applicant: Hitachi Construction Machinery Co., Ltd.Inventor: Osamu Gokita
-
Patent number: 7452177Abstract: A parallel support member is constituted by a pair of links that are respectively arranged on the left and right sides of a second boom. These links are connected between a first boom and a third boom. Thus, the second boom is moved to the left or right side by an offset cylinder. In this case, when one of the links pulls the third boom, the third boom, an arm, and a bucket can be moved toward the left or right side of a vehicle body to be parallel to the first boom. At this time, the links accept a force exerted in the pulling direction, but need not receive a force exerted in the compression direction, so that the cross sectional areas, the weights of these links can be reduced.Type: GrantFiled: September 14, 2005Date of Patent: November 18, 2008Assignee: Hitachi Construction Machinery Co., Ltd.Inventor: Osamu Gokita
-
Publication number: 20070242910Abstract: Grease for a slide bearing, which can suppress unusual noise attributable to a slip caused between a shaft and a bearing when a machine is stopped. In slide bearing grease 24 supplied to between a slide bearing 16 formed of a porous sintered alloy-made bushing having pores 30 impregnated with lubricating oil 31 and a shaft 22 inserted in the slide bearing 16 and supported to be slidingly rotatable in the circumferential direction, the slide bearing grease 24 employs base oil having dynamic viscosity of 10-70 mm2/s at 40° C. and exuding under a load of the shaft 22 to form an oil film 35 between the slide bearing 16 and the shaft 22.Type: ApplicationFiled: October 25, 2005Publication date: October 18, 2007Applicant: HITACHI CONTRUCTION MACHINERY CO., LTD.Inventors: Hideki Akita, Osamu Gokita, Minoru Fujisaki, Hajime Maezawa, Nobuo Yanaka, Hiroshi Nishimura, Hideyuki Fujiya
-
Publication number: 20070172343Abstract: A parallel support member is constituted by a pair of links that are respectively arranged on the left and right sides of a second boom. These links are connected between a first boom and a third boom. Thus, the second boom is moved to the left or right side by an offset cylinder. In this case, when one of the links pulls the third boom the third boom, an arm, and a bucket can be moved toward the left or right side of a vehicle body to be parallel to the first boom. At this time, the links accept a force exerted in the pulling direction, but need not receive a force exerted in the compression direction, so that the cross sectional areas, the weights of these links can be reduced.Type: ApplicationFiled: September 14, 2005Publication date: July 26, 2007Inventor: Osamu Gokita
-
Publication number: 20060263191Abstract: A tool repositioning mechanism (20) is provided between a fore end of a telescopic boom (12) and a cargo handling tool (35). The tool repositioning mechanism (20) is constituted by a head member (21), swing arm (25), swing cylinder (29), tool mount member (30) and a link (34). As a swing cylinder (29) is expanded or contracted, the cargo handling tool (35) is shifted to the right or to the left of the telescopic boom (12) through the tool repositioning mechanism (20). Accordingly, even if a spot of a lifted cargo on the cargo handling tool (35) is deviated from a cargo unloading spot in a lateral direction, the position of the lifted cargo can be adjusted easily by the tool repositioning mechanism (20) to unload the cargo accurately on a specified spot.Type: ApplicationFiled: July 23, 2004Publication date: November 23, 2006Inventors: Osamu Gokita, Yoshio Namai
-
Publication number: 20060219650Abstract: A telescopic boom device is constructed of a first boom section 1, a second boom section 2 telescopically received in the first boom section 1, and an extension/retraction cylinder. The boom sections 1,2 are constructed of main parts 1a,2a, boss brackets 1c,2c arranged integrally on ends of the main parts 1a,2a via partitions 1b,2b, slide pad brackets 1e,2e arranged integrally on opposite ends of the main parts 1a,2a via partitions 1d,2d, respectively, bosses 1f,2f arranged on the boss brackets 1c,2c, and slide pads 1g,2g arranged on the slide pad brackets 1e,2e, respectively. The plural slide pads 1g are attached on an inner wall of the slide pad bracket 1e formed larger in the width dimension and height dimension than the main part 1a, and the plural slide pads 2g are attached on an outer wall of the slide pad bracket 2e formed smaller in the width dimension and height dimension than the main part 2a.Type: ApplicationFiled: March 8, 2004Publication date: October 5, 2006Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventor: Osamu Gokita
-
Patent number: 7112032Abstract: Protective projections (26D) which are provided on cylinder mounting brackets (26) of a cargo handling tool (21) are arranged to project toward a vehicle body (2) from behind the cargo handling tool (21). When the vehicle body (2) is driven in reverse direction with a boom (12) in a folded position on the side of the ground, the protective projections (26D) are collided against obstacles (A) on the ground prior to a rod (27C) of a fork cylinder (27) if the lower side (2A) of the vehicle body (2) has passed over and clear of the obstacles (A). Thus, the protective projections (26D) function to protect the fork cylinder rod (27C) of the fork cylinder (27) against direct collision against obstacles (A) on the ground.Type: GrantFiled: December 18, 2003Date of Patent: September 26, 2006Assignee: Hitachi Construction Machinery Co., Ltd.Inventor: Osamu Gokita