Patents by Inventor David A. Yeager
David A. Yeager 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: 7955333Abstract: A method of preparing a patient's one leg, that is in need of treatment, for ambulation. The method includes the steps of: applying an external fixation assembly, having at least one external frame component, by pinning the at least one external frame component to at least one of the patient's bones in the patient's one leg so as to prepare the patient's one leg for healing; providing a foot assembly with a sole assembly defining a bearing surface and a connecting assembly; and operatively joining the foot assembly to the patient's one leg, whereby the patient can walk in a manner whereupon weight of the patient's body is applied by a patient's one foot, that is part of the user's one leg, to the sole assembly and therethrough to and against an underlying surface during ambulation.Type: GrantFiled: November 15, 2007Date of Patent: June 7, 2011Inventor: David A. Yeager
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Publication number: 20090131935Abstract: A method of preparing a patient's one leg, that is in need of treatment, for ambulation. The method includes the steps of: applying an external fixation assembly, having at least one external frame component, by pinning the at least one external frame component to at least one of the patient's bones in the patient's one leg so as to prepare the patient's one leg for healing; providing a foot assembly with a sole assembly defining a bearing surface and a connecting assembly; and operatively joining the foot assembly to the patient's one leg, whereby the patient can walk in a manner whereupon weight of the patient's body is applied by a patient's one foot, that is part of the user's one leg, to the sole assembly and therethrough to and against an underlying surface during ambulation.Type: ApplicationFiled: November 15, 2007Publication date: May 21, 2009Inventor: David A. Yeager
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Patent number: 5629091Abstract: A collection of agglomerated anti-friction grains for plasma deposition, the grains each consisting essentially of (a) H.sub.2 O atomized stainless steel particles, (b) solid lubricant particles consisting of at least one of boron nitride or a eutectic of calcium fluoride and lithium fluoride, and (c) a binder holding said steel and solid lubricant particles together for plasma spraying, said binder being present in an amount of 0.5-4.0% by weight and is vaporizable at the temperature of plasma spraying and does not interfere with the deposited process.Type: GrantFiled: December 9, 1994Date of Patent: May 13, 1997Assignee: Ford Motor CompanyInventors: V. Durga N. Rao, Robert A. Rose, David A. Yeager, Carlo A. Fucinari
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Patent number: 5598763Abstract: A piston and ring assembly operative within a cylindrical bore wall to retain fluid to one side. The piston has a side wall for movement along the cylindrical wall and has one or more spaced grooves in the side wall, each groove defining a pair of interior groove surfaces spaced apart a uniform distance; at least one sealing element presenting a pair of opposed surfaces operating between and along the pair of groove surfaces, the sealing element being capable of engaging the cylindrical wall, the spacing between the opposed surfaces of the sealing element and the pair of interior surfaces of the groove being no greater than ten microns; and a solid film lubricant mixture coating the groove surfaces and the opposed surfaces of the sealing element, whereby surface adhesion of the fluid, present in the spacing, inhibiting migration of such fluid through the spacing and flutter of the sealing element, in said spacing, being essentially eliminated.Type: GrantFiled: March 14, 1994Date of Patent: February 4, 1997Assignee: Ford Motor CompanyInventors: V. Durga N. Rao, David A. Yeager
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Patent number: 5568891Abstract: Apparatus for fracturing a powder metal bearing support having stress risers to initiate cracking along a cracking plane. The apparatus has (a) a fixture assembly for holding one internal side of the bearing stationary, and (b) structure for fracturingly pulling a second internal side of the bearing away from the one internal side along a track in a direction substantially perpendicular to the cracking plane.Type: GrantFiled: May 2, 1994Date of Patent: October 29, 1996Inventors: Peter Y. Hoag, David A. Yeager
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Patent number: 5566450Abstract: A method of flexibly manufacturing engine blocks by first bonding an extruded tube liner insert, of a given thickness (1-15 mm), to a fixed configuration block, the liner insert having been coated with an anti-friction wear-resistant coating having a controlled standard thickness, and secondly bonding an extruded tube liner insert of a different thickness (again selected from 1-15 mm) to another of the fixed configuration blocks, the second liner insert having been coated with the same type of anti-friction wear-resistant coating in essentially the same controlled standard thickness. The common sized engine block can have (i) identically shaped circular cylindrical bore walls or (ii) ovoid cylindrical bore walls with the liner insert having an interior surface shape selection varying between circular to ovoid. The block and liner insert may be both made of aluminum.Type: GrantFiled: March 16, 1995Date of Patent: October 22, 1996Assignee: Ford Motor CompanyInventors: V. Durga Nageswar Rao, Robert A. Rose, David A. Yeager, Daniel M. Kabat
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Patent number: 5490445Abstract: A piston and ring assembly operative within a cylindrical bore wall to retain pressurized fluid to one side of the assembly, the piston having a crown and an annular side wall for movement along the bore wall.Type: GrantFiled: March 14, 1994Date of Patent: February 13, 1996Assignee: Ford Motor CompanyInventors: V. Durga N. Rao, David A. Yeager
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Patent number: 5353500Abstract: A method of making a connecting rod for attachment to a bearing journal by separation of parts of the connecting rod, including: (a) forging a powder metal sintered preform to provide a one-piece connecting rod having an annular wall defining a crank opening with a center axis and with stress risers for establishing a cracking plane that extends across said crank opening; (b) providing access for a compression coupling across the cracking plane; (c) while at ambient conditions, applying tension substantially uniformly across the cracking plane to propogate fracture from the stress risers along said cracking plane and thereby separate the connecting rod into a cap and body with cracked surfaces; and (d) remating the cap and body by applying a compression coupling through the access to draw said cap and body together under guidance and with metal yielding pressure to effect substantially an exact rematch of said cracked surfaces.Type: GrantFiled: July 20, 1992Date of Patent: October 11, 1994Inventors: Peter Y. Hoag, David A. Yeager
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Patent number: 5313919Abstract: A low-friction piston construction for use in an oil-fed cylinder bore with the piston skirt relieved to define lands that are coated with SFL (graphite, MoS.sub.2, BN, and a special expoxy resin). A method of making such piston construction including provision of asperities on the skirt wall onto which the SFL coating is thermally sprayed and formation of small pockets at the mouth of the asperities to additionally act as oil replenishing reservoirs. A method of using such piston construction in an engine which comprises provisions of a slightly increased gap between the piston and cylinder wall and formation of a transferred SFL coating from the piston to the cylinder wall resulting in two polished microsmooth mating coatings, each attractive to oil films.Type: GrantFiled: June 14, 1993Date of Patent: May 24, 1994Assignee: Ford Motor CompanyInventors: Vemulapalli D. N. Rao, Daniel M. Kabat, David A. Yeager
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Patent number: 5239955Abstract: A low-friction piston construction for use in an oil-fed cylinder bore with the piston skirt relieved to define lands that are coated with SFL (graphite, MoS.sub.2, BN, and a special expoxy resin). A method of making such piston construction including provision of asperities on the skirt wall onto which the SFL coating is thermally sprayed and formation of small pockets at the mouth of the asperities to additionally act as oil replenishing reservoirs. A method of using such piston construction in an engine which comprises provisions of a slightly increased gap between the piston and cylinder wall and formation of a transferred SFL coating from the piston to the cylinder wall resulting in two polished microsmooth mating coatings, each attractive to oil films.Type: GrantFiled: January 7, 1993Date of Patent: August 31, 1993Assignee: Ford Motor CompanyInventors: Vemulapalli D. N. Rao, Daniel M. Kabat, David A. Yeager
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Patent number: 5140869Abstract: A precision cast connecting rod which has an elongate tubular shank member defining a hollow section for producing desired stiffness to weight characteristics. Piston and crankpin connecting members are attached to opposite ends of the shank member. The connecting members are provided with passages which extend axially therewithin from the hollow section. Defined within the elongate tubular shank member is a radially extending central aperture.Type: GrantFiled: June 24, 1991Date of Patent: August 25, 1992Assignee: Ford Motor CompanyInventors: Robert Mrdjenovich, David A. Yeager
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Patent number: 5131577Abstract: A method of making a connecting rod for attachment to a bearing journal by separation of parts of the connecting rod, comprising: (a) forging a powder metal sintered preform to provide a one-piece connecting rod having an annular wall defining a crank opening with a center axis and with stress risers for establishing a cracking plane that extends across said crank opening; (b) providing access for a compression coupling across the cracking plane; (c) while at ambient conditions, applying tension substantially uniformly across the cracking plane to propogate fracture from the stress risers along said cracking plane and thereby separate the connecting rod into a cap and body with cracked surfaces; and (d) remating the cap and body by applying a compression coupling through the access to draw said cap and body together under guidance and with metal yielding pressure to effect substantially an exact rematch of said cracked surfaces.Type: GrantFiled: January 14, 1991Date of Patent: July 21, 1992Assignee: Ford Motor CompanyInventors: Peter Y. Hoag, David A. Yeager
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Patent number: 5109605Abstract: A method of making a connecting rod for attachment to a bearing journal by separation of parts of the connecting rod, comprising: (a) forging a powder metal sintered preform to provide a one-piece connecting rod having an annular wall defining a crank opening with a center axis and with stress risers for establishing a cracking plane that extends across said crank opening; (b) providing access for a compression coupling across the cracking plane; (c) while at ambient conditions, applying tension substantially uniformly across the cracking plane to propagate fracture from the stress risers along said cracking plane and thereby separate the connecting rod into a cap and body with cracked surfaces; and (d) remating the cap and body by applying a compression coupling through the access to draw said cap and body together under guidance and with metal yielding pressure to effect substantially an exact rematch of said cracked surfaces.Type: GrantFiled: January 14, 1991Date of Patent: May 5, 1992Assignee: Ford Motor CompanyInventors: Peter Y. Hoag, David A. Yeager
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Patent number: 5063992Abstract: A precision cast connecting rod which has an elongate tubular shank member defining a hollow section for producing desired stiffness to weight characteristics. Piston and crankpin connecting members are attached to opposite ends of the shank member. The connecting members are provided with passages which extend axially therewithin from the hollow section. Defined within the elongate tubular shank member is a radially extending central aperture. A precision casting method for preparing the hollow connecting rod includes forming an elongate core with a locating member positioned at each end thereof and a disk-shaped protuberance extending radially therefrom. The core is secured in a die and defines a cavity therebetween for preparing a pattern of the connecting rod using a molding material which substantially encapsulates the core within the cavity. After removing the pattern from the die, coatings of refractory material are applied to form a shell mold which encrusts the pattern.Type: GrantFiled: February 6, 1991Date of Patent: November 12, 1991Assignee: Ford Motor CompanyInventors: Robert Mrdjenovich, David A. Yeager
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Patent number: 5048368Abstract: A precision cast connecting rod which has an elongate tubular shank member defining a hollow section for producing desired stiffness to weight characteristics. Piston and crankpin connecting members are attached to opposite ends of the shank member. The connecting members are provided with passages which extend axially therewithin from the hollow section. Defined within the elongate tubular shank member is a radially extending central aperture. A precision casting method for preparing the hollow connecting rod includes forming an elongate core with a locating member positioned at each end thereof and a disk-shaped protuberance extending radially therefrom. The core is secured in a die and defines a cavity therebetween for preparing a pattern of the connecting rod using a molding material which substantially encapsulates the core within the cavity. After removing the pattern from the die, coatings of refractory material are applied to form a shell mold which encrusts the pattern.Type: GrantFiled: July 31, 1989Date of Patent: September 17, 1991Assignee: Ford Motor CompanyInventors: Robert Mrdjenovich, David A. Yeager
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Patent number: 4993134Abstract: A method of making a connecting rod for attachment to a bearing journal by separation of parts of the connecting rod, comprising: (a) forging a powder metal sintered preform to provide a one-piece connecting rod having an annular wall defining a crank opening with a center axis and with stress risers for establishing a cracking plane that extends across said crank opening; (b) providing access for a compression coupling across the cracking plane; (c) while at ambient conditions, applying tension substantially uniformly across the cracking plane to propogate fracture from the stress risers along said cracking plane and thereby separate the connecting rod into a cap and body with cracked surfaces; and (d) remating the cap and body by applying a compression coupling through the access to draw said cap and body together under guidance and with metal yielding pressure to effect substantially an exact rematch of said cracked surfaces.Type: GrantFiled: May 17, 1988Date of Patent: February 19, 1991Assignee: Ford Motor CompanyInventors: Peter Y. Hoag, David A. Yeager
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Patent number: 4936163Abstract: A method of making a connecting rod for attachment to a bearing journal by separation of parts of the connecting rod, comprising: (a) forging a powder metal sintered preform to provide a one-piece connecting rod having an annular wall defining a crank opening with a center axis and with stress risers for establishing a cracking plane that extends across said crank opening; (b) providing access for a compression coupling across the cracking plane; (c) while at ambient conditions, applying tension substantially uniformly across the cracking plane to propogate fracture from the stress risers along said cracking plane and thereby separate the connecting rod into a cap and body with cracked surrfaces; and (d) remating the cap and body by applying a compression coupling through the access to draw said cap and body together under guidance and with metal yielding pressure to effect substantially an exact rematch of said cracked surfaces.Type: GrantFiled: October 20, 1989Date of Patent: June 26, 1990Assignee: Ford Motor CompanyInventors: Peter Y. Hoag, David A. Yeager