Patents by Inventor Stefan Frei
Stefan Frei 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: 11592089Abstract: A spindle nut (S) for a ball screw is conventionally designed as a hollow cylinder with a central-symmetrical middle longitudinal axis (Z). The spindle nut has an internal thread, which is designed as a ball groove (K) arranged on the cylinder inner surface. Pairs of load-relief bores (B) serve as substantially cylindrical channels for guiding the balls out of and into the ball channel (K) through the wall of the spindle nut. Each load-relief bore (B) is distinguished by a generatrix (L), which has an intersection point (C) with the thread base line of the ball channel (K) and constitutes the geometric continuation of the traveling path of a ball from the ball channel (K) into the load-relief bore (B). A tangent (T) to the cylinder surface (G) runs in a parallel manner at a spacing a >0 to the generatrix (L), both T and L being perpendicular to a common normal (R) to the middle longitudinal axis (Z).Type: GrantFiled: September 22, 2021Date of Patent: February 28, 2023Assignee: SFS Group International AGInventors: Andras Nagypal, Stefan Frei, David Fischlin, Marijo Zach
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Patent number: 11572937Abstract: A ball screw including a threaded spindle and a spindle nut has a ball deflector arranged in an opening in the lateral surface of the spindle nut. The ball deflector is formed with an upper shell and a lower shell, the lower shell being arranged radially inwardly closer to the spindle nut longitudinal axis than the upper shell. The lower shell has a substantially half-shell-shaped contour. Both the upper shell and the lower shell are fastened in the spindle nut without any further, discrete mechanical fastening elements, and the ball deflector formed thereby does not protrude beyond the outer contour defined by the spindle nut.Type: GrantFiled: December 14, 2018Date of Patent: February 7, 2023Assignee: SFS intec Holding AGInventors: Andre Schadlich, Stefan Frei, Daniel Sinz, Marijo Zach
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Publication number: 20230003270Abstract: An operating unit for a parking brake of motor vehicles including an operatively connected unit having of a drive spindle and nut, which forms an axially longitudinally adjustable element of a linear drive. The drive spindle has a drive side for connection to an electric drive and a substantially cylindrical spindle portion having an external thread. The nut has a sleeve-shaped central body having an internal thread and a head portion designed to act as a pressure piston on a brake element of the parking brake. The internal and external threads intermesh in the operative connection and define a common axial axis of rotation. The thread is a symmetrical thread, and the flank angles, relative to a radial reference plane perpendicular to the axis of rotation, have angle values which are substantially equal in magnitude.Type: ApplicationFiled: November 17, 2020Publication date: January 5, 2023Applicant: SFS Group International AGInventors: Edi PERIC, Stefan FREI, Christian SUTTER
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Patent number: 11506267Abstract: A ball screw drive (10) including a threaded spindle (12) and a spindle nut (14) which at least partially coaxially encloses the threaded spindle (12) and has a stop at an axial end face (18). A multiplicity of balls can circulate in the space (16) between the threaded spindle (12) and the spindle nut (14). A radial stop element (22) is connected to the threaded spindle (12) in a force-fitting manner and adapted to interact with the complementary axial end face (18) of the spindle nut (14). A bearing element is provided for receiving a first longitudinal end of the spindle nut (12). The radial stop element (22) and the bearing element are designed in combination as an integral bearing/stop element (24) which has two anti-rotation features (26, 28).Type: GrantFiled: July 25, 2019Date of Patent: November 22, 2022Assignee: SFS intec Holding AGInventors: Edi Peric, Andre Schadlich, Stefan Frei, Marijo Zach
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Publication number: 20220356934Abstract: A tolerance ring is an intermediate element for a shaft/hub connection that is positioned in a groove between shaft and hub and that produces a force-fitting connection between these two elements. It has substantially the shape of a hollow cylinder, wherein the lateral surface thereof has embossments in the form of radially inwardly and/or outwardly pointing elevations. Here, provision is made at one longitudinal end of a flange-like collar, which is applied in a radial plane with respect to the central longitudinal axis. The tolerance ring is preferably manufactured in one piece with the flange-like collar from metal as a deep-drawn part, preferably being manufactured from aluminum or an aluminum alloy. An assembly method for such a tolerance ring, and a ball screw drive, and a screw drive, having such a tolerance ring are also provided.Type: ApplicationFiled: May 6, 2022Publication date: November 10, 2022Applicant: SFS Group International AGInventors: Stefan FREI, Markus SCHÖNENBERGER, Alexander Christoph STAUDIGL
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Patent number: 11473657Abstract: A method for producing a spindle nut (10) for a ball screw (12) is provided, having the following steps: providing a substantially cylindrical workpiece (50) with first and second end faces (46, 44) and a lateral surface (14), shaping the workpiece (50) by pressing in an axially symmetrical central opening (16) and by simultaneously pressing in at least one first (18) and one second (20) channel which are arranged axially in parallel in the lateral surface (14) of the workpiece (50), the central opening (16) and the channels (18, 20) being open toward the first end face (46), introducing an internal thread (34) into the central opening (16), and introducing at least two radially running through-openings (22, 24) at least into the first channel in the form of a transfer channel for receiving diverting inserts (26, 28). A spindle nut (10) produced by the method and to a ball screw (12) having such a spindle nut (10) are also provided.Type: GrantFiled: March 25, 2021Date of Patent: October 18, 2022Assignee: SFS intec Holding AGInventors: Daniel Sinz, Stefan Frei
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Publication number: 20220090660Abstract: A spindle nut (S) for a ball screw is conventionally designed as a hollow cylinder with a central-symmetrical middle longitudinal axis (Z). The spindle nut has an internal thread, which is designed as a ball groove (K) arranged on the cylinder inner surface. Pairs of load-relief bores (B) serve as substantially cylindrical channels for guiding the balls out of and into the ball channel (K) through the wall of the spindle nut. Each load-relief bore (B) is distinguished by a generatrix (L), which has an intersection point (C) with the thread base line of the ball channel (K) and constitutes the geometric continuation of the traveling path of a ball from the ball channel (K) into the load-relief bore (B). A tangent (T) to the cylinder surface (G) runs in a parallel manner at a spacing a >0 to the generatrix (L), both T and L being perpendicular to a common normal (R) to the middle longitudinal axis (Z).Type: ApplicationFiled: September 22, 2021Publication date: March 24, 2022Applicant: SFS intec Holding AGInventors: Andras NAGYPAL, Stefan FREI, David FISCHLIN, Marijo ZACH
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Publication number: 20210301911Abstract: A method for producing a spindle nut (10) for a ball screw (12) is provided, having the following steps: providing a substantially cylindrical workpiece (50) with first and second end faces (46, 44) and a lateral surface (14), shaping the workpiece (50) by pressing in an axially symmetrical central opening (16) and by simultaneously pressing in at least one first (18) and one second (20) channel which are arranged axially in parallel in the lateral surface (14) of the workpiece (50), the central opening (16) and the channels (18, 20) being open toward the first end face (46), introducing an internal thread (34) into the central opening (16), and introducing at least two radially running through-openings (22, 24) at least into the first channel in the form of a transfer channel for receiving diverting inserts (26, 28). A spindle nut (10) produced by the method and to a ball screw (12) having such a spindle nut (10) are also provided.Type: ApplicationFiled: March 25, 2021Publication date: September 30, 2021Applicant: SFS intec Holding AGInventors: Daniel SINZ, Stefan FREI
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Patent number: 10948057Abstract: A ball screw drive having a threaded spindle and a spindle nut which coaxially encloses it at least partially. The spindle nut receives a ball deflector and therefore has an imbalance caused thereby. A force transmission element is positively connected to the spindle nut. The outer surface of the spindle nut has a recess which is dimensioned and arranged to serve as a stop or groove for the force transmission element and also contributes to the imbalance compensation of the spindle nut. An imbalance compensation method is also provided by fixing the action surface as a surface recess such that the smallest width of the recess is at least 3 times as large as the maximum radial indentation thereof. The filling up of at least parts of the recess by the force transmission element is accounted for and the recess is lengthened along the spindle nut for imbalance reduction.Type: GrantFiled: April 19, 2019Date of Patent: March 16, 2021Assignee: SFS intec Holding AGInventors: Edi Peric, Stefan Frei, Andre Schadlich, Marijo Zach
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Patent number: 10883580Abstract: A ball screw having a spindle nut (21), a threaded spindle, and a retaining element (23) is provided. The retaining element (23) is connected in a form-fitting, play-free manner to the threaded nut (21) by a projection (24) which fits around the outside of the threaded nut (21) in an end region. The threaded nut (21) and the retaining element (23) functioning as a force transmission member are first positioned precisely during manufacture and then connected by a form-fitting, in particular play-free connection, in particular by caulking, crimping, clinching or other deformation processes.Type: GrantFiled: October 18, 2017Date of Patent: January 5, 2021Assignee: SFS intec Holding AGInventors: Hanspeter Kuster, Marijo Zach, Andreas Kalb, Stefan Frei, Pascal Hutter
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Publication number: 20200049238Abstract: A ball screw drive (10) including a threaded spindle (12) and a spindle nut (14) which at least partially coaxially encloses the threaded spindle (12) and has a stop at an axial end face (18). A multiplicity of balls can circulate in the space (16) between the threaded spindle (12) and the spindle nut (14). A radial stop element (22) is connected to the threaded spindle (12) in a force-fitting manner and adapted to interact with the complementary axial end face (18) of the spindle nut (14). A bearing element is provided for receiving a first longitudinal end of the spindle nut (12). The radial stop element (22) and the bearing element are designed in combination as an integral bearing/stop element (24) which has two anti-rotation features (26, 28).Type: ApplicationFiled: July 25, 2019Publication date: February 13, 2020Applicant: SFS intec Holding AGInventors: Edi Peric, Andre Schadlich, Stefan Frei, Marijo Zach
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Publication number: 20190323586Abstract: A ball screw drive having a threaded spindle and a spindle nut which coaxially encloses at least partially the threaded spindle. The spindle nut receives a ball deflector and therefore has an imbalance caused by the structure. A force transmission element is positively connected to the spindle nut. Here, the outer surface of the spindle nut has at least one recess which is dimensioned and arranged to serve as a stop or groove for the force transmission element and at the same time contributes to the imbalance compensation of the spindle nut. An imbalance compensation method is also provided by fixing the action surface as a surface recess such that the smallest width b of the recess is at least 3 times as large as the maximum radial indentation t thereof. The filling up of at least parts of the recess by the force transmission element is then taken into account and the recess is lengthened along the spindle nut for imbalance reduction.Type: ApplicationFiled: April 19, 2019Publication date: October 24, 2019Applicant: SFS intec Holding AGInventors: Edi Peric, Stefan Frei, Andre Schadlich, Marijo Zach
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Publication number: 20190186606Abstract: A ball screw including a threaded spindle and a spindle nut has a ball deflector arranged in an opening in the lateral surface of the spindle nut. The ball deflector is formed with an upper shell and a lower shell, the lower shell being arranged radially inwardly closer to the spindle nut longitudinal axis than the upper shell. The lower shell has a substantially half-shell-shaped contour. Both the upper shell and the lower shell are fastened in the spindle nut without any further, discrete mechanical fastening elements, and the ball deflector formed thereby does not protrude beyond the outer contour defined by the spindle nut.Type: ApplicationFiled: December 14, 2018Publication date: June 20, 2019Applicant: SFS intec Holding AGInventors: Andre Schadlich, Stefan Frei, Daniel Sinz, Marijo Zach
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Publication number: 20180112751Abstract: A ball screw having a spindle nut (21), a threaded spindle, and a retaining element (23) is provided. The retaining element (23) is connected in a form-fitting, play-free manner to the threaded nut (21) by a projection (24) which fits around the outside of the threaded nut (21) in an end region. The threaded nut (21) and the retaining element (23) functioning as a force transmission member are first positioned precisely during manufacture and then connected by a form-fitting, in particular play-free connection, in particular by caulking, crimping, clinching or other deformation processes.Type: ApplicationFiled: October 18, 2017Publication date: April 26, 2018Applicant: SFS intec Holding AGInventors: Hanspeter Kuster, Marijo Zach, Andreas Kalb, Stefan Frei, Pascal Hutter
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Publication number: 20170329975Abstract: A system and method for modeling viable threats and for evading deployed defenses on a network are described. As a defensive tool used for threat modeling, the system and method allows those responsible for the safety of their critical infrastructure and intellectual property to have a clear view of all failures in the security countermeasure products they have deployed. As an offensive tool used for defense evasion modeling, the system and method can be used to quickly ascertain a viable attack vector, select exploitation code, and cross-reference those exploits that will bypass every layer of countermeasure technologies to commercially- and publicly-accessible crimeware and security testing tools.Type: ApplicationFiled: May 26, 2017Publication date: November 16, 2017Inventors: Francisco S. Artes, Stefan Frei
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Patent number: 9665721Abstract: A system and method for modeling viable threats and for evading deployed defenses on a network are described. As a defensive tool used for threat modeling, the system and method allows those responsible for the safety of their critical infrastructure and intellectual property to have a clear view of all failures in the security countermeasure products they have deployed. As an offensive tool used for defense evasion modeling, the system and method can be used to quickly ascertain a viable attack vector, select exploitation code, and cross-reference those exploits that will bypass every layer of countermeasure technologies to commercially- and publicly-accessible crimeware and security testing tools.Type: GrantFiled: April 21, 2015Date of Patent: May 30, 2017Assignee: NSS LABS, INC.Inventors: Francisco S. Artes, Stefan Frei
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Publication number: 20150310217Abstract: A system and method for modeling viable threats and for evading deployed defenses on a network are described. As a defensive tool used for threat modeling, the system and method allows those responsible for the safety of their critical infrastructure and intellectual property to have a clear view of all failures in the security countermeasure products they have deployed. As an offensive tool used for defense evasion modeling, the system and method can be used to quickly ascertain a viable attack vector, select exploitation code, and cross-reference those exploits that will bypass every layer of countermeasure technologies to commercially- and publicly-accessible crimeware and security testing tools.Type: ApplicationFiled: April 21, 2015Publication date: October 29, 2015Inventors: Francisco S. Artes, Stefan Frei
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Patent number: 8294906Abstract: A measuring head system for a coordinate measuring machine, having a scanning element for contacting a measured object as a contacting part, which can be moved such that an object to be measured can be mechanically scanned using the scanning element. An optical sensor is fixed on the measuring head base. Means are provided to generate a projection on the sensor line using at least one radiation source. The means have at least one first mask element to generate a first partial projection on the sensor line such that said partial projection is optimized to determine an x displacement and a y displacement of the contacting part in relation to the measuring head base in the x direction or y direction. An analysis unit is configured to determine the x displacement and the y displacement from signals only generated by the one sensor line.Type: GrantFiled: October 29, 2008Date of Patent: October 23, 2012Assignee: Leica Geosystems AGInventors: Knut Siercks, Heinz Lippuner, Ursula Schwitter, Stefan Frei, Baptiste Wusk, Claus P. Keferstein
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Publication number: 20110013199Abstract: The invention relates to a measuring head system (1) for a coordinate measuring machine, having a scanning element (6), which has a part provided for contacting a measured object as a contacting part (5), which can be moved in relation to a fixed measuring head base (2) in a lateral x direction (20) and a lateral y direction (21), such that an object to be measured can be mechanically scanned using the scanning element (6). An optical sensor (10), having a sensor line (11) which can be read out and comprises a plurality of array sensor elements, is fixed on the measuring head base (2). Furthermore, means are provided, which are particularly disposed spatially fixed to the contacting part (5), generate a projection—as a function of displacements of the contacting part (5) in relation to the measuring head base (2)—on the sensor line (11) using at least one radiation source (15). In addition, an analysis unit is provided.Type: ApplicationFiled: October 29, 2008Publication date: January 20, 2011Applicant: LEICA GEOSYSTEMS AGInventors: Knut Siercks, Heinz Lippuner, Ursula Schwitter, Stefan Frei, Baptiste Wusk, Claus P. Keferstein