Patents by Inventor Stefan Lohmann
Stefan Lohmann 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: 10112290Abstract: A device for monitoring pressure within a gas space, which is filled with gas, preferably nitrogen, and/or is prestressed, of a pressure accumulator of a hydraulically driven percussive mechanism having a housing in which a piston is mounted, together with a display element which extends through the face surface of the housing, so as to be slidingly movable counter to the force of a spring, wherein the piston divides the housing into a pressure chamber and a spring chamber. The spring acts on a spring chamber-side working surface of the piston, and the pressure accumulator is at least indirectly operatively connected to the pressure chamber-side working surface of the piston, such that, in the event of a critical pressure within the pressure accumulator being undershot, the piston and the display element are displaced to such an extent that the display element protrudes out of the housing.Type: GrantFiled: June 24, 2015Date of Patent: October 30, 2018Assignee: CONSTRUCTION TOOLS GMBHInventors: Uwe Autschbach, Stefan Lohmann
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Patent number: 10052746Abstract: A device for monitoring the pressure within a gas space, which is filled with a gas, preferably nitrogen, and/or is prestressed, of a pressure accumulator of a hydraulically driven percussive mechanism, in particular of a demolition hammer or of a drilling hammer, having a housing in which a piston is mounted, together with an indicator element which extends through the face surface of the housing, in slidingly movable fashion. The piston divides the housing into two chambers, and a first, pressure accumulator-side chamber and a pressure accumulator-side working surface, which is averted from the indicator element, of the piston are operatively connected at least indirectly to the gas space of the pressure accumulator. A second, hydraulics-side chamber and a hydraulics-side working surface, facing toward the indicator element, of the piston are connected to the hydraulic system of the percussive mechanism.Type: GrantFiled: June 24, 2015Date of Patent: August 21, 2018Assignee: Construction Tools GmbHInventors: Uwe Autschbach, Stefan Lohmann
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Patent number: 9574962Abstract: The present invention relates to a hydraulic attachment comprising a hydraulic circuit, the attachment being a construction or demolition tool, in particular a hydraulic breaker, demolition shears, scrap shears, a pulverizer, a gripper, a crusher bucket or a compactor, which can be mechanically connected to a support device and hydraulically connected to the hydraulic system of the support device. In order to enable the hydraulic circuit to be opened quickly and safely within an attachment and, in particular, to make it possible to display the presence of a particular pressure level within a hydraulic attachment and to determine whether a dangerous residual pressure is present in the system, a hydraulic attachment is proposed that has a residual pressure display (40) which is connected to the hydraulic circuit of the attachment in a detachable or non-detachable manner.Type: GrantFiled: March 19, 2013Date of Patent: February 21, 2017Assignee: CONSTRUCTION TOOLS GMBHInventors: Oliver Preuss, Stefan Lohmann, Colin Dirr, Oleg Knjazev, Martina Jaekel, Uwe Autschbach, Markus Mellwig
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Publication number: 20150375383Abstract: A device for monitoring the pressure within a gas space, which is filled with a gas, preferably nitrogen, and/or is prestressed, of a pressure accumulator of a hydraulically driven percussive mechanism, in particular of a demolition hammer or of a drilling hammer, having a housing in which a piston is mounted, together with an indicator element which extends through the face surface of the housing, in slidingly movable fashion. The piston divides the housing into two chambers, and a first, pressure accumulator-side chamber and a pressure accumulator-side working surface, which is averted from the indicator element, of the piston are operatively connected at least indirectly to the gas space of the pressure accumulator. A second, hydraulics-side chamber and a hydraulics-side working surface, facing toward the indicator element, of the piston are connected to the hydraulic system of the percussive mechanism.Type: ApplicationFiled: June 24, 2015Publication date: December 31, 2015Inventors: Uwe AUTSCHBACH, Stefan LOHMANN
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Publication number: 20150375382Abstract: A device for monitoring pressure within a gas space, which is filled with gas, preferably nitrogen, and/or is prestressed, of a pressure accumulator of a hydraulically driven percussive mechanism having a housing in which a piston is mounted, together with a display element which extends through the face surface of the housing, so as to be slidingly movable counter to the force of a spring, wherein the piston divides the housing into a pressure chamber and a spring chamber. The spring acts on a spring chamber-side working surface of the piston, and the pressure accumulator is at least indirectly operatively connected to the pressure chamber-side working surface of the piston, such that, in the event of a critical pressure within the pressure accumulator being undershot, the piston and the display element are displaced to such an extent that the display element protrudes out of the housing.Type: ApplicationFiled: June 24, 2015Publication date: December 31, 2015Inventors: Uwe AUTSCHBACH, Stefan LOHMANN
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Publication number: 20150027569Abstract: The present invention relates to a hydraulic attachment comprising a hydraulic circuit, the attachment being a construction or demolition tool, in particular a hydraulic breaker, demolition shears, scrap shears, a pulveriser, a gripper, a crusher bucket or a compactor, which can be mechanically connected to a support device and hydraulically connected to the hydraulic system of the support device. In order to enable the hydraulic circuit to be opened quickly and safely within an attachment and, in particular, to make it possible to display the presence of a particular pressure level within a hydraulic attachment and to determine whether a dangerous residual pressure is present in the system, a hydraulic attachment is proposed that has a residual pressure display (40) which is connected to the hydraulic circuit of the attachment in a detachable or non-detachable manner.Type: ApplicationFiled: March 19, 2013Publication date: January 29, 2015Inventors: Oliver Preuss, Stefan Lohmann, Colin Dirr, Oleg Knjazev, Martina Jaekel, Uwe Autschbach, Markus Mellwig
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Patent number: 7779930Abstract: The invention relates to a striking device (5) comprising a striking mechanism (8) which is driven by a pressure medium. Said device comprises a percussion piston (13) which can be displaced back and forth by means of a control device and a control valve which is embodied as a pressure shut-off valve (19) or as a stop valve, said control valve automatically stopping the striking mechanism if it exceeds a predetermined maximum value based on the working pressure controlling the inlet line, blocking the pressure line (3) or maintaining the control device in one of the and positions thereof. The inventive striking device also comprises a hydraulic catcher buffer which is used to brake the percussion piston when it exceeds a predetermined impact plane. According to the invention, the control valve must remain deactivated at least as long as the percussion piston is displaced on the hydraulic catcher buffer.Type: GrantFiled: July 2, 2005Date of Patent: August 24, 2010Assignee: Atlas Copco Construction Tools GmbHInventors: Stefan Lohmann, Karlheinz Fritz, Reiner Koch, Markus Mellwig, Hendrik Moller, Uwe Autschbach
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Publication number: 20080296035Abstract: The invention relates to a striking device (5) comprising a striking mechanism (8) which is driven by a pressure medium. Said device comprises a percussion piston (13) which can be displaced back and forth by means of a control device and a control valve which is embodied as a pressure shut-off valve (19) or as a stop valve, said control valve automatically stopping the striking mechanism if it exceeds a predetermined maximum value based on the working pressure controlling the inlet line, blocking the pressure line (3) or maintaining the control device in one of the end positions thereof. The inventive striking device also comprises a hydraulic catcher buffer which is used to brake the percussion piston when it exceeds a predetermined impact plane. According to the invention, the control valve must remain deactivated at least as long as the percussion piston is displaced on the hydraulic catcher buffer.Type: ApplicationFiled: July 2, 2005Publication date: December 4, 2008Inventors: Stefan Lohmann, Karlheinz Fritz, Reiner Kock, Markus Mellwig, Hendrik Moller, Uwe Autschbach
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Patent number: 7412788Abstract: A demolition claw has a support, a pivot pin mounted on the support and centered on and extending along an axis, and two jaws each having a hole through which the pivot pin extends so that the jaws can pivot on the support about the axis. The jaws have adjacent the respective holes confronting flat faces. An arcuate formation fixed on one of the faces adjacent the respective hole projects axially therefrom toward the other of the faces and is generally centered on the axis. A retaining formation fixed on the other of the faces adjacent the respective hole projects axially therefrom toward the one face, is radially offset from the arcuate formation, axially overlaps the arcuate formation, and surrounds the arcuate formation. Structure is provided on one of the jaws for preventing axial separation of the jaws.Type: GrantFiled: May 27, 2005Date of Patent: August 19, 2008Assignee: Atlas Copco Construction Tools GmbHInventors: Sebastian Schipp, Stefan Lohmann
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Publication number: 20060000125Abstract: A demolition claw has a support, a pivot pin mounted on the support and centered on and extending along an axis, and two jaws each having a hole through which the pivot pin extends so that the jaws can pivot on the support about the axis. The jaws have adjacent the respective holes confronting flat faces. An arcuate formation fixed on one of the faces adjacent the respective hole projects axially therefrom toward the other of the faces and is generally centered on the axis. A retaining formation fixed on the other of the faces adjacent the respective hole projects axially therefrom toward the one face, is radially offset from the arcuate formation, axially overlaps the arcuate formation, and surrounds the arcuate formation. Structure is provided on one of the jaws for preventing axial separation of the jaws.Type: ApplicationFiled: May 27, 2005Publication date: January 5, 2006Inventors: Sebastian Schipp, Stefan Lohmann
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Patent number: 6672403Abstract: Depending on the working and application conditions, it may be desirable to equip fluid-operated percussion devices with a mechanism that protects against no-load strokes, particularly in the interest of avoiding undesired stress. In the present case, this protection mechanism is configured such that the control unit that influences the movements of the percussion piston is blocked by a safety element in the form of a multiple-position valve, and the percussion device is halted if the percussion piston overshoots the extended position occurring in normal operation by a defined distance, thereby assuming a no-load-stroke position. The safety element (21) that acts on the control unit (5) of the percussion device (1) is automatically controlled, notably such that it is not switched to be active until some time after the startup of the percussion device (1) acted on by the working pressure. The percussion device (1) can therefore start up without being influenced by the safety element (21).Type: GrantFiled: April 30, 2002Date of Patent: January 6, 2004Assignee: Krupp Berco Bautechnik GmbHInventors: Torsten Ahr, Thomas Deimel, Stefan Lohmann
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Publication number: 20020185285Abstract: Depending on the working and application conditions, it may be desirable to equip fluid-operated percussion devices with a mechanism that protects against no-load strokes, particularly in the interest of avoiding undesired stress. In the present case, this protection mechanism is configured such that the control unit that influences the movements of the percussion piston is blocked by a safety element in the form of a multiple-position valve, and the percussion device is halted if the percussion piston overshoots the extended position occurring in normal operation by a defined distance, thereby assuming a no-load-stroke position. The safety element (21) that acts on the control unit (5) of the percussion device (1) is automatically controlled, notably such that it is not switched to be active until some time after the startup of the percussion device (1) acted on by the working pressure. The percussion device (1) can therefore start up without being influenced by the safety element (21).Type: ApplicationFiled: April 30, 2002Publication date: December 12, 2002Inventors: Torsten Ahr, Thomas Deimel, Stefan Lohmann