Patents by Inventor Lennart Strandberg
Lennart Strandberg 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: 7610989Abstract: System for controlling at least one hydraulic cylinder (2, 3) having a first control valve unit (4) connected to the hydraulic cylinder for regulation thereof. A first operable control means (5) is included and which is adapted for controlling the first control valve unit. A second control valve unit (6) is also included that is connected to the hydraulic cylinder for regulation thereof, and a second operable control means (7) is further provided and which is adapted for controlling the second control valve unit. The system also includes means (23) for prioritizing the first control means. The prioritizing means (23) is controlled via hydraulics in such a way that the effect of the second control means (6) on the regulation of the hydraulic cylinder (2, 3) is at least substantially reduced as soon as the first control means (5) is operated.Type: GrantFiled: November 29, 2004Date of Patent: November 3, 2009Assignee: Volvo Construction Equipment ABInventors: Bo Vigholm, Lennart Strandberg
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Publication number: 20080116211Abstract: The present invention relates to a container (1) for liquid or another fluid. The container comprises at least two wall elements (2-5) of stainless steel, which are joined by means of tape and/or glue. The present invention also relates to a method of manufacturing a container for liquid or another fluid.Type: ApplicationFiled: January 26, 2006Publication date: May 22, 2008Inventors: Jan Ericson, Lennart Strandberg
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Patent number: 7287374Abstract: The invention relates to a method and system for controlling viscosity of a hydraulic fluid. The viscosity of a hydraulic fluid is usually very much dependent on temperature. By using existing throttles which generate a pressure drop, the hydraulic fluid can be heated by creating a power drain in these existing throttles through a controlled increase of the pressure through them. By controlled heating, the viscosity of a hydraulic fluid can be controlled. According to the invention, the existing throttles are preferably cavity-preventing openings in valves.Type: GrantFiled: October 7, 2005Date of Patent: October 30, 2007Assignee: Volvo Construction Equipment Holding Sweden ABInventors: Bo Vigholm, Lennart Strandberg
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Patent number: 7210395Abstract: The invention relates to a system for handling an implement on a vehicle which comprises a frame. The system comprises a lifting apparatus arranged between the frame and the implement for raising and lowering the implement in relation to the frame, a pump (11) coupled to the lifting apparatus for supplying this with a fluid in order to produce said movements, and an operating valve (10) arranged between the pump and the lifting apparatus for controlling the flow of said fluid to the of said fluid to and from the lifting apparatus. The system further comprises a control device (9) which is designed to disconnect the control of the lifting apparatus via said fluid. The control device is coupled in such a way to an operating element 814) arranged in the vehicle cab (13) that control of the control device via the operating element is permitted independently of the control of the operating valve.Type: GrantFiled: April 28, 2005Date of Patent: May 1, 2007Assignee: Volvo Construction Equipment Holding Sweden ABInventors: Lennart Strandberg, Bo Vigholm, Johan Lillemets
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Patent number: 7052060Abstract: Method and device for gripping one or more elongated element(s), which device includes two main gripping arms (1, 2) adapted to hold the element(s) between them. At least one first hydraulic cylinder (6, 7) is provided for moving the main gripping arms relative to one another. The device also has at least one auxiliary gripping arm (3, 4) and at least one second hydraulic cylinder (8, 9) for moving the auxiliary gripping arm relative to the main gripping arms in order to press the element(s) against the main gripping arms. The second hydraulic cylinder (8, 9) is connected operationally to the first hydraulic cylinder (6, 7) in such a way that the movement of the auxiliary gripping arm (3, 4) is initiated only when the piston of the first hydraulic cylinder reaches a predetermined position.Type: GrantFiled: October 22, 2004Date of Patent: May 30, 2006Assignee: Volvo Construction Equipment ABInventors: Bo Vigholm, Gunnar Lindgren, Lennart Strandberg
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Publication number: 20060021340Abstract: The invention relates to a method and system for controlling viscosity of a hydraulic fluid. The viscosity of a hydraulic fluid is usually very much dependent on temperature. By using existing throttles which generate a pressure drop, the hydraulic fluid can be heated by creating a power drain in these existing throttles through a controlled increase of the pressure through them. By controlled heating, the viscosity of a hydraulic fluid can be controlled. According to the invention, the existing throttles are preferably cavity-preventing openings in valves.Type: ApplicationFiled: October 7, 2005Publication date: February 2, 2006Applicant: VOLVO CONSTRUCTION EQUIPMENT HOLDING SWEDEN ABInventors: Bo Vigholm, Lennart Strandberg
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Publication number: 20050198951Abstract: The invention relates to a system for handling an implement on a vehicle which comprises a frame. The system comprises a lifting apparatus arranged between the frame and the implement for raising and lowering the implement in relation to the frame, a pump (11) coupled to the lifting apparatus for supplying this with a fluid in order to produce said movements, and an operating valve (10) arranged between the pump and the lifting apparatus for controlling the flow of said fluid to the of said fluid to and from the lifting apparatus. The system further comprises a control device (9) which is designed to disconnect the control of the lifting apparatus via said fluid. The control device is coupled in such a way to an operating element 814) arranged in the vehicle cab (13) that control of the control device via the operating element is permitted independently of the control of the operating valve.Type: ApplicationFiled: April 28, 2005Publication date: September 15, 2005Applicant: VOLVO CONSTRUCTION EQUIPMENT HOLDING SWEDEN ABInventors: Lennart Strandberg, Bo Vigholm, Johan Lillemets
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Publication number: 20050146115Abstract: System for controlling at least one hydraulic cylinder (2, 3) having a first control valve unit (4) connected to the hydraulic cylinder for regulation thereof. A first operable control means (5) is included and which is adapted for controlling the first control valve unit. A second control valve unit (6) is also included that is connected to the hydraulic cylinder for regulation thereof, and a second operable control means (7) is further provided and which is adapted for controlling the second control valve unit. The system also includes means (23) for prioritizing the first control means. The prioritizing means (23) is controlled via hydraulics in such a way that the effect of the second control means (6) on the regulation of the hydraulic cylinder (2, 3) is at least substantially reduced as soon as the first control means (5) is operated.Type: ApplicationFiled: November 29, 2004Publication date: July 7, 2005Applicant: VOLVO CONSTRUCTION EQUIPMENT HOLDING SWEDEN ABInventors: Bo Vigholm, Lennart Strandberg
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Publication number: 20050140154Abstract: Method and device for gripping one or more elongated element(s), which device includes two main gripping arms (1, 2) adapted to hold said element(s) between them. At least one first hydraulic cylinder (6, 7) is provided for moving the main gripping arms relative to one another. The device also has at least one auxiliary gripping arm (3, 4) and at least one second hydraulic cylinder (8, 9) for moving the auxiliary gripping arm relative to the main gripping arms in order to press the element(s) against the main gripping arms. The second hydraulic cylinder (8, 9) is connected operationally to the first hydraulic cylinder (6, 7) in such a way that the movement of the auxiliary gripping arm (3, 4) is initiated only when the piston of the first hydraulic cylinder reaches a predetermined position.Type: ApplicationFiled: October 22, 2004Publication date: June 30, 2005Applicant: VOLVO CONSTRUCTION EQUIPMENT HOLDING SWEDEN ABInventors: Bo Vigholm, Gunnar Lindgren, Lennart Strandberg
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Patent number: 5227584Abstract: The invention relates to a condenser type barrier for field control in transformer bushings and their connection to the conductor of a transformer winding for transformers used in HVDC converter plants. The condenser barrier is arranged as a solid of revolution with concentrically laid condenser layers. It is formed from both ends with inwardly-directed, straight frustums of cones with equally large smallest bases, between which the condenser barrier is formed as a concentric inner, straight circular cylinder.Type: GrantFiled: April 22, 1992Date of Patent: July 13, 1993Assignee: Asea Brown Boveri ABInventors: Lars Holmstrom, Lennart Strandberg
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Patent number: 5198622Abstract: The invention relates to a condenser body for field control in transformer bushings and the connection of the body to the conductor of a transformer winding for transformers used in HVDC converter plants. The condenser body is arranged as a solid of revolution with concentrically laid condenser layers. It is formed from one end with an outwardly-directed straight frustum of a cone and from the other end with an inwardly-directed straight frustum of a cone.Type: GrantFiled: May 12, 1992Date of Patent: March 30, 1993Assignee: Asea Brown Boveri ABInventors: Asa Hammarsten, Lennart Strandberg, Bengt-Olof Stenestam