Patents by Inventor Ossi Kahra
Ossi Kahra 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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Publication number: 20170361445Abstract: A body of an impact unit, an impact unit and a method of forming a body of an impact unit is disclosed. The body can be an elongated hollow piece including at least two body parts. The body parts are arranged successively in an axial direction of the body and are connected to each other by axial connecting joints. The connecting joints include several slanted fastening screws for connecting the body parts together.Type: ApplicationFiled: June 16, 2017Publication date: December 21, 2017Inventors: Ossi KAHRA, Juhani LAINE
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Patent number: 9777842Abstract: A seal of a tool of a breaking hammer, a sealing arrangement, a breaking hammer and a method of sealing a tool of breaking hammer is provided. The seal is a sealing ring having an outer periphery provided with several projecting elements, which are slanted. The projecting elements generate torque in the sealing ring when being pushed in a transverse direction during use of the breaking hammer. Thus, the sealing ring may rotate relative to the tool.Type: GrantFiled: June 24, 2015Date of Patent: October 3, 2017Assignee: SANDVIK MINING AND CONSTRUCTION OYInventors: Ossi Kahra, Jyrki Nissinen
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Publication number: 20160123472Abstract: A seal of a tool of a breaking hammer, a sealing arrangement, a breaking hammer and a method of sealing a tool of breaking hammer is provided. The seal is a sealing ring having an outer periphery provided with several projecting elements, which are slanted. The projecting elements generate torque in the sealing ring when being pushed in a transverse direction during use of the breaking hammer. Thus, the sealing ring may rotate relative to the tool.Type: ApplicationFiled: June 24, 2015Publication date: May 5, 2016Inventors: Ossi KAHRA, Jyrki NISSINEN
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Patent number: 9095968Abstract: The invention relates to a tool for a breaking hammer, a breaking hammer, and the use of a breaking hammer. The breaking hammer includes a percussion device, the percussion piston of which providing impacts to the tool for breaking rock. An impact surface of the tool has a curved form surface that has a radius of curvature and a center axis on the longitudinal axis of the tool. The direction of the centre axis is transverse to the plane through the longitudinal axis of the boom of a work machine.Type: GrantFiled: September 12, 2012Date of Patent: August 4, 2015Assignee: SANDVIK MINING & CONSTRUCTION OYInventor: Ossi Kahra
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Publication number: 20140346840Abstract: The invention relates to a tool for a breaking hammer, a breaking hammer, and the use of a breaking hammer. The breaking hammer includes a percussion device, the percussion piston of which providing impacts to the tool for breaking rock. An impact surface of the tool has a curved form surface that has a radius of curvature and a center axis on the longitudinal axis of the tool. The direction of the centre axis is transverse to the plane through the longitudinal axis of the boom of a work machine.Type: ApplicationFiled: September 12, 2012Publication date: November 27, 2014Applicant: SANDVIK MINING AND CONSTRUCTION OYInventor: Ossi Kahra
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Patent number: 8550180Abstract: The invention relates to a method for fitting a breaking device tool with a bearing, a breaking device and a tool bushing. The tool of the breaking device is fitted with a bearing with at least one bearing bushing manufactured of bearing material and arranged in a bearing space. There is a clearance fit between the bearing bushing and the bearing space, whereby the bearing bushing is insertable into the bearing space by manual force. During the use, compression stress pulses are given to the tool with a percussion device, whereby stress waves travel in the tool, which waves generate on the tool surface a movement in the direction of its perpendicular. This movement is transmitted to the bearing bushing, and it deforms the bearing bushing in the radial direction in such a way that the bearing bushing is pressed against the bearing space.Type: GrantFiled: December 3, 2007Date of Patent: October 8, 2013Assignee: Sandvik Mining and Construction OyInventor: Ossi Kahra
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Publication number: 20080173457Abstract: The invention relates to a method for fitting a breaking device tool with a bearing, a breaking device and a tool bushing. The tool of the breaking device is fitted with a bearing with at least one bearing bushing manufactured of bearing material and arranged in a bearing space. There is a clearance fit between the bearing bushing and the bearing space, whereby the bearing bushing is insertable into the bearing space by manual force. During the use, compression stress pulses are given to the tool with a percussion device, whereby stress waves travel in the tool, which waves generate on the tool surface a movement in the direction of its perpendicular. This movement is transmitted to the bearing bushing, and it deforms the bearing bushing in the radial direction in such a way that the bearing bushing is pressed against the bearing space.Type: ApplicationFiled: December 3, 2007Publication date: July 24, 2008Inventor: Ossi Kahra
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Patent number: 6929098Abstract: An arrangement for lubricating the bearing surfaces between a tool of a hydraulic impact device and the impact device, the arrangement comprising a supply pump and a channel for supplying lubricant. The arrangement comprises at least two separate channels (19, 20), and both channels comprise a separate dosing pump (17, 18) which supply predetermined amounts of lubricant between the bearing surfaces when the impact device starts.Type: GrantFiled: December 23, 2002Date of Patent: August 16, 2005Assignee: Sandvik Tamrock OyInventors: Jouko Ilmarinen, Ossi Kahra, Mika Oksman, Timo Sippus
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Publication number: 20030121725Abstract: An arrangement for lubricating the bearing surfaces between a tool of a hydraulic impact device and the impact device, the arrangement comprising a supply pump and a channel for supplying lubricant. The arrangement comprises at least two separate channels (19, 20), and both channels comprise a separate dosing pump (17, 18) which supply predetermined amounts of lubricant between the bearing surfaces when the impact device starts.Type: ApplicationFiled: December 23, 2002Publication date: July 3, 2003Inventors: Jouko Ilmarinen, Ossi Kahra, Mika Oksman, Timo Sippus
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Patent number: 6561285Abstract: A breaking apparatus, which comprises a percussion device (1), and in the extension thereof, a tool (3) to which a percussion piston (2) belonging to a percussion device delivers impacts. In the axial direction, the movement of the tool is limited by a stopper element (15) if the movement of the tool exceeds a predetermined range of movement (B) in the direction of the impact (A). The stopper element (15) is a piece made of elastic material, which is arranged in a space between the tool and a supporting surface (16). During the stopping of the tool, the capacity of the space for the stopper element reduces, whereby the element is subjected to pressing. By the effect of the tool movement, the stopper element thus rotates about its cross-sectional central axis (21) and at the same time changes its cross-sectional shape in the reducing space. The invention further relates to a tool used in the above-described breaking apparatus.Type: GrantFiled: October 9, 2001Date of Patent: May 13, 2003Assignee: Sandvik Tamrock OyInventors: Juha Intonen, Ossi Kahra, Jari Korkeila, Ilkka Niemi, Timo Sippus
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Publication number: 20020040798Abstract: A breaking apparatus, which comprises a percussion device (1), and in the extension thereof, a tool (3) to which a percussion piston (2) belonging to a percussion device delivers impacts. In the axial direction, the movement of the tool is limited by means of a stopper element (15) if the movement of the tool exceeds a predetermined range of movement (B) in the direction of the impact (A). The stopper element (15) is a piece made of elastic material, which is arranged in a space between the tool and a supporting surface (16). During the stopping of the tool, the capacity of the space for the stopper element reduces, whereby the element is subjected to pressing. By the effect of the tool movement, the stopper element thus rotates about its cross-sectional central axis (21) and at the same time changes its cross-sectional shape in the reducing space. The invention further relates to a tool used in the above-described breaking apparatus.Type: ApplicationFiled: October 9, 2001Publication date: April 11, 2002Inventors: Juha Intonen, Ossi Kahra, Jari Korkeila, Ilkka Niemi, Timo Sippus
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Patent number: 5784943Abstract: A hydraulic actuator includes three cylinder spaces: a first cylinder space (6) located between a ring piston and a cylinder; a second cylinder space (7) between the ring piston and an auxiliary piston inside a hollow piston rod connected to the ring piston; and the third cylinder space (8) formed between the ring piston, the cylinder and the hollow piston rod.Type: GrantFiled: March 13, 1997Date of Patent: July 28, 1998Assignee: Tamrock OyInventor: Ossi Kahra
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Patent number: 5123358Abstract: A bogie for a railway vehicle comprising of at least two articulated, pivotable and rotatable wheel body parts (2, 3) including wheels or a set of wheels (4, 5) mounted in bearings and the supporting body (6) of the bogie being connected to the parts by a suspension (9a, 9b) of the railway vehicle. In the bogie, two wheel body parts (2, 3) have been resiliently interconnected from their side constructions by two stabilizer constructions (16) both of which have been articulated to the supporting body (6).Type: GrantFiled: May 22, 1990Date of Patent: June 23, 1992Assignee: Rautaruukki OyInventors: Markku Kemppainen, Ossi Kahra, Aki Kauhanen
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Patent number: D676061Type: GrantFiled: December 2, 2011Date of Patent: February 12, 2013Assignee: Sandvik Intellectual Property ABInventors: Philipp Beierer, Ossi Kahra