Patents by Inventor Fouad Y. Zeidan
Fouad Y. Zeidan 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: 9328797Abstract: A module flexible ligament damper includes an cylindrical inner structure with a central axis and an outer cylindrical surface. An outer casing with an inner cylindrical surface is positioned around the inner structure. A modular ligament with an inner flange and an outer flange connected by a web is positioned between the inner structure and the casing. The inner flange is connected to the inner structure and the outer flange is connected to the casing to support the inner structure within the casing, and to permit free orbital movement of the inner structure on a plane perpendicular to the axis of the inner structure. In one embodiment, the web is straight but does not intersect the axis of the inner structure for flexing in a radial direction. In other embodiments, the web is curved for radial flexing.Type: GrantFiled: August 15, 2014Date of Patent: May 3, 2016Assignee: WAUKESHA BEARINGS CORPORATIONInventor: Fouad Y. Zeidan
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Publication number: 20140353102Abstract: A module flexible ligament damper includes an cylindrical inner structure with a central axis and an outer cylindrical surface. An outer casing with an inner cylindrical surface is positioned around the inner structure. A modular ligament with an inner flange and an outer flange connected by a web is positioned between the inner structure and the casing. The inner flange is connected to the inner structure and the outer flange is connected to the casing to support the inner structure within the casing, and to permit free orbital movement of the inner structure on a plane perpendicular to the axis of the inner structure. In one embodiment, the web is straight but does not intersect the axis of the inner structure for flexing in a radial direction. In other embodiments, the web is curved for radial flexing.Type: ApplicationFiled: August 15, 2014Publication date: December 4, 2014Inventor: Fouad Y. Zeidan
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Patent number: 8834027Abstract: A module flexible ligament damper includes an cylindrical inner structure with a central axis and an outer cylindrical surface. An outer casing with an inner cylindrical surface is positioned around the inner structure. A modular ligament with an inner flange and an outer flange connected by a web is positioned between the inner structure and the casing. The inner flange is connected to the inner structure and the outer flange is connected to the casing to support the inner structure within the casing, and to permit free orbital movement of the inner structure on a plane perpendicular to the axis of the inner structure. In one embodiment, the web is straight but does not intersect the axis of the inner structure for flexing in a radial direction. In other embodiments, the web is curved for radial flexing.Type: GrantFiled: January 13, 2011Date of Patent: September 16, 2014Inventor: Fouad Y. Zeidan
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Patent number: 8408802Abstract: The bi-directional rotation offset pivot thrust bearing includes a carrier and an array of longitudinal protrusions thereon that run through the center axis of the carrier. An array of pads are in slidable engagement with the longitudinal protrusions to permit the thrusts pads to move between first and second rotational positions. The thrust pads are automatically offset pivoted in a first direction when in a the first rotational position and automatically offset pivoted in a second direction when in the second rotational position. The thrust pads are offset pivoted in an approximate 60 percent to 40 percent ratio with the leading side of the thrust pad being 60 percent in both the first rotational position and the second rotational position. A retainer is also provided to maintain the thrust pads in slidable communication with the protrusions.Type: GrantFiled: June 4, 2010Date of Patent: April 2, 2013Assignee: Waukesha Bearings CorporationInventor: Fouad Y. Zeidan
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Publication number: 20120181734Abstract: A module flexible ligament damper includes an cylindrical inner structure with a central axis and an outer cylindrical surface. An outer casing with an inner cylindrical surface is positioned around the inner structure. A modular ligament with an inner flange and an outer flange connected by a web is positioned between the inner structure and the casing. The inner flange is connected to the inner structure and the outer flange is connected to the casing to support the inner structure within the casing, and to permit free orbital movement of the inner structure on a plane perpendicular to the axis of the inner structure. In one embodiment, the web is straight but does not intersect the axis of the inner structure for flexing in a radial direction. In other embodiments, the web is curved for radial flexing.Type: ApplicationFiled: January 13, 2011Publication date: July 19, 2012Applicant: WAUKESHA BEARINGS CORPORATIONInventor: Fouad Y. Zeidan
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Publication number: 20100310201Abstract: The bi-directional rotation offset pivot thrust bearing includes a carrier and an array of longitudinal protrusions thereon that run through the center axis of the carrier. An array of pads are in slidable engagement with the longitudinal protrusions to permit the thrusts pads to move between first and second rotational positions. The thrust pads are automatically offset pivoted in a first direction when in a the first rotational position and automatically offset pivoted in a second direction when in the second rotational position. The thrust pads are offset pivoted in an approximate 60 percent to 40 percent ratio with the leading side of the thrust pad being 60 percent in both the first rotational position and the second rotational position. A retainer is also provided to maintain the thrust pads in slidable communication with the protrusions.Type: ApplicationFiled: June 4, 2010Publication date: December 9, 2010Applicants: KMC, INC., BEARINGS PLUS, INC.Inventor: Fouad Y. Zeidan
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Patent number: 6379046Abstract: A hydrodynamic bearing is constructed having a modular bearing pad support system which provides flexure pivot motion about an axis parallel to the axis of rotation of the supported shaft to provide hydrodynamic performance and a rocking motion about an axis transverse to the axis of rotation of the supported shaft to provide tolerance to misalignment and bending of the shaft.Type: GrantFiled: November 8, 2000Date of Patent: April 30, 2002Assignee: KMC, Inc.Inventor: Fouad Y. Zeidän
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Patent number: 6170989Abstract: A hydrodynamic bearing is constructed having a modular bearing pad support system which provides flexure pivot motion about an axis parallel to the axis of rotation of the supported shaft to provide hydrodynamic performance and a rocking motion about an axis transverse to the axis of rotation of the supported shaft to provide tolerance to misalignment and bending of the shaft.Type: GrantFiled: June 10, 1998Date of Patent: January 9, 2001Assignee: KMC, Inc.Inventor: Fouad Y. Zeidan
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Patent number: 5743654Abstract: A one piece hydrodynamic bearing which can include hydrostatic support features. The pads are supported on a single thin web for pivoting on a support structure which can include one or more beam-like members. The bearings may have hydrostatic and active control attributes and is very attractive in cryogenic applications where it is very difficult to prevent leakage in conventional hydrostatic tilt pad bearings. The hydrostatic feed through the post eliminates this problem completely and prevents the fretting at the pivots common with conventional tilt pad bearings. A cavity provided under a pad support membrane can be used as an active control device. The pressure can cause the bearing set or assembly clearance to be reduced thus providing better damping and centering capability. The preload in the pad can be actively controlled in this manner. The pad has a limiting device to prevent a negative pre-load condition from occurring.Type: GrantFiled: August 17, 1993Date of Patent: April 28, 1998Assignee: KMC, Inc.Inventors: Russell D. Ide, Fouad Y. Zeidan
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Patent number: 5603574Abstract: A fluid-dampened support for a bearing such as a tilt pad bearing or a rolling element bearing such as a ball bearing, needle bearing, roller bearing and the like. The fluid dampened support includes a network of closely spaced beams which act as structural springs which support the outer race of the roller bearing for movement in any direction. The spring rate or constant of these structural springs can be caused to change after a selected amount of deflection. The amount of deflection needed to cause the change in spring rate can be adjusted to suit the particular application. A liquid is provided in the spaces between the beams to dampen movement of the pads. The damping rate can be made to change with movement of the pads. The structure and space between the beams is designed so as to provide virtually any reasonable damping characteristics.Type: GrantFiled: May 28, 1996Date of Patent: February 18, 1997Assignee: KMC, Inc.Inventors: Russell D. Ide, Fouad Y. Zeidan
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Patent number: 5564836Abstract: A hydrodynamic bearing which includes a carrier and a plurality of bearing pads circumferentially-spaced about the carrier. The pads may have a modular construction whereby pad portions are releasably secured to support portions. The pads may also be releasably secured to the carrier. Various bearing pad constructions, are contemplated including constructions in which the secondary support portion includes a membrane and the primary support portion includes a cylindrical member extending between the membrane and the bearing pads. A continuous bearing pad ring may be substituted for the discrete bearing pads. The carrier may be provided with locator pins in the pad receiving bores to orient the pads properly. The carrier may have cuts and grooves formed therein to provide a flexible or even beam mounted support for the bearing pads. The bearing may also have a multimode configuration and may include smart structures.Type: GrantFiled: April 19, 1994Date of Patent: October 15, 1996Assignee: KMC, Inc.Inventors: Russell D. Ide, Fouad Y. Zeidan
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Patent number: 5547287Abstract: A method and bearing construction for inhibiting hot oil carryover in hydrodynamic bearings. The method includes supporting the pads so that they form a hydrodynamic wedge and supplying oil to the entrance of the wedge. The oil flowing through the wedge is pressurized and oil exiting the hydrodynamic wedge is directed away from the adjacent wedge. Oil is then supplied from another source to the adjacent wedge.Various bearing constructions can be used to practice the method of the present invention. These bearing constructions include some form of a scraper to inhibit flow of hot oil. The scraper is located between the trailing edge of one bearing pad and the fluid nozzle passage of an adjacent pad. The scraper may be integrally formed with the bearing pad or it may be separate. The scraper may be pushed toward or away from the shaft using electrical, mechanical, hydraulic or magnetic devices.An alternative form of hydrodynamic bearing including two different types of pads is also disclosed.Type: GrantFiled: December 7, 1993Date of Patent: August 20, 1996Assignee: KMC, Inc.Inventor: Fouad Y. Zeidan
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Patent number: 5531522Abstract: A fluid dampened support for a bearing such as a tilt pad bearing or a rolling element bearing such as a ball bearing, needle bearing, roller bearing and the like. The fluid dampened support includes a network of closely spaced beams which act as structural springs which support the outer race of the roller bearing for movement in any direction. The spring rate or constant of these structural springs can be caused to change after a selected amount of deflection. The amount of deflection needed to cause the change in spring rate can be adjusted to suit the particular application. A liquid is provided in the spaces between the beams to dampen movement of the pads. The damping rate can be made to change with movement of the pads. The structure and space between the beams is designed so as to provide virtually any reasonable damping characteristics.Type: GrantFiled: October 13, 1994Date of Patent: July 2, 1996Assignee: KMC, Inc.Inventors: Russell D. Ide, Fouad Y. Zeidan
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Patent number: 5513917Abstract: A one piece hydrodynamic bearing which can include hydrostatic support features. The pads are supported on a single thin web for pivoting on a support structure which can include one or more beam-like members. The bearings may have hydrostatic and active control attributes and is very attractive in cryogenic applications where it is very difficult to prevent leakage in conventional hydrostatic tilt pad bearings. The hydrostatic feed through the post eliminates this problem completely and prevents the fretting at the pivots common with conventional tilt pad bearings. A cavity provided under a pad support membrane can be used as an active control device. The pressure can cause the bearing set or assembly clearance to be reduced thus providing better damping and centering capability. The preload in the pad can be actively controlled in this manner. The pad has a limiting device to prevent a negative pre-load condition from occurring.Type: GrantFiled: June 5, 1995Date of Patent: May 7, 1996Assignee: KMC, Inc.Inventors: Russell D. Ide, Fouad Y. Zeidan
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Patent number: 5421655Abstract: A fluid dampened support for a bearing such as a tilt pad bearing or a rolling element bearing such as a ball bearing, needle bearing, roller bearing and the like. The fluid dampened support includes a network of closely spaced beams which act as structural springs which support the outer race of the roller bearing for movement in any direction. The spring rate or constant of these structural springs can be caused to change after a selected amount of deflection. The amount of deflection needed to cause the change in spring rate can be adjusted to suit the particular application. A liquid is provided in the spaces between the beams to dampen movement of the pads. The damping rate can be made to change with movement of the pads. The structure and space between the beams is designed so as to provide virtually any reasonable damping characteristics.Type: GrantFiled: April 16, 1993Date of Patent: June 6, 1995Assignee: KMC, Inc.Inventors: Russell D. Ide, Fouad Y. Zeidan