Patents Assigned to Stackpole Limited
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Patent number: 7955063Abstract: A vane pump comprising a case, a rotor disposed in the case, the rotor having a bore, a plurality of vanes radially moveable with respect to the rotor extend from the rotor, a drive shaft engaged with the bore, a second shaft fixedly connected to the case and extending from the case to slidingly engage the bore, a land extending from each end of the rotor, each land cooperating with the case to seal a fluid flow, and each land further axially controlling a rotor position within the case by a sliding engagement, and the drive shaft retainable in a predetermined position with respect to the case.Type: GrantFiled: May 19, 2008Date of Patent: June 7, 2011Assignee: Stackpole LimitedInventors: Robert H. Mooy, Paul M. Morton
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Publication number: 20090129964Abstract: A method for producing a powder metal article having a three dimensional shape and having at least one densified surface comprising: a) providing a blend of powdered metals; b) compacting said blend to form a pre-form having a general shape of said article; c) sintering said pre-form; d) densifying at least one cylindrical surface region of said pre-form; and, e) forming said pre-form to a final density and into the three dimensional shape of said article.Type: ApplicationFiled: December 23, 2005Publication date: May 21, 2009Applicant: STACKPOLE LIMITEDInventors: Huw David, Peter K. Jones, Roger Lawcock
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Patent number: 6907971Abstract: A one-way clutch assembly comprises a clutch casing including a first plate coupled to a second plate, such as clutch inner and clutch outer plates. The first and second plates have a common central axis, the first and second plates are spaced apart along the common axis to define an interior. The assembly also includes a ratchet plate disposed in the interior between the first and second plates, the ratchet plate has the same common axis and is displaceable along the axis within the interior. A first torque transfer mechanism, such as a set of mating splines is used to rotationally couple the ratchet plate to the first plate. A second one-way torque transfer mechanism is used for releasably coupling the ratchet plate to the second plate, the second transfer mechanism including a set of fixed flat and angled portions formed on a ratchet plate surface opposite the second plate and a complimentary set of fixed flat and angled portions formed on a second plate surface opposite the ratchet surface.Type: GrantFiled: December 30, 2002Date of Patent: June 21, 2005Assignee: Stackpole LimitedInventors: Semih Demir, Norman Scott
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Patent number: 6440357Abstract: A multiple-acting powder metal press is disclosed for making green form double helical gear compacts. The press has inner and outer lower punches, and an upper, outer punch. The upper and lower outer punches have left hand and right hand external helical profiles as chosen to produce a desired helical gear. The punches co-operate with left hand and right hand helical dies carried by the press about the punches. The helical faces require that the dies rotate relative to the punches during operation. A cam and roller mechanism may drive this rotation. The compact forming process commences with an open position in which powder is introduced to a vacant lower die cavity. The upper portions of the press advance downward to close the cavity. All parts of the press except the lower inner, or transfer, punch then move downward at the same speed to transfer powder to the extremities of the cavity. When transfer is complete both lower punches may be stopped, while the upper punches continue to advance.Type: GrantFiled: August 12, 1999Date of Patent: August 27, 2002Assignee: Stackpole LimitedInventor: Gerd Hinzmann
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Patent number: 6365094Abstract: A toolset for forming a component from a powdered metal charge includes a die having two zones on the sidewall. Lubricant is applied to one of the zones. The powdered metal charge is initially compressed to an intermediate density and the lubricated zone of the sidewall brought into contact with the partially compressed charge. The charge is then further compressed to a final density.Type: GrantFiled: January 31, 2000Date of Patent: April 2, 2002Assignee: Stackpole LimitedInventors: Gerd Hinzmann, Karol Kucharski, Rohith Shivanath
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Patent number: 6346213Abstract: A process of forming a sintered article of powder metal comprising blending graphite, Si carbide and lubricant, with pre-alloyed iron base powder; pressing said blended mixture to a shaped article; sintering said article in a reduced atmosphere; forced cooling said sintered article.Type: GrantFiled: November 29, 1999Date of Patent: February 12, 2002Assignee: Stackpole LimitedInventors: Rohith Shivanath, Karol Kucharski, Peter Jones
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Patent number: 6318986Abstract: This invention relates to a device to compact parts with an undercut out of powder material having an upper die moveable relative a lower die, at least one upper punch associated with the upper die for relative movement therebetween, at least two lower punches associated with the lower die for relative movement therebetween, the lower punches defining a lower cavity with the lower die for filling with the powder material when the dies are in an open position, the upper die contacting the lower die in a closed position for movement of one of the lower punches towards the upper die so as to transfer the powder material towards the upper die and then to compact the powder material between the upper and lower punches with said dies in the closed position so as to produce the part; the dies moveable to an eject position for ejection of the compacted part.Type: GrantFiled: July 20, 1998Date of Patent: November 20, 2001Assignee: Stackpole LimitedInventors: Gerd Hinzmann, Mark Haiko, Frank Ma, Allan Wilson, Keith Buckley-Golder, Robert Round
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Patent number: 6193927Abstract: The invention relates to methods of forming sintered compacts of low alloy steel composition to high density at ambient temperature. The invention provides for a method of forming sintered powder metal articles by forming the sintered powder metal in a die cavity having a clearance for movement of said sintered powder metal to a final shape with increased density after compaction wherein the formed sintered powder metal article has a compaction length which is approximately 3 to 30% less than the original length.Type: GrantFiled: January 8, 1999Date of Patent: February 27, 2001Assignee: Stackpole LimitedInventors: Peter Jones, Roger Lawcock
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Patent number: 6165400Abstract: A multiply-acting powder metal press is disclosed for making green form double helical gear compacts. The press has inner and outer lower punches, and an upper, outer punch. The upper and lower outer punches have left hand and right hand external helical profiles as chosen to produce a desired helical gear. The punches co-operate with left hand and right hand helical dies carried by the press about the punches. The helical faces require that the dies rotate relative to the punches during operation. A cam and roller mechanism may drive this rotation. The compact forming process commences with an open position in which powder is introduced to a vacant lower die cavity. The upper portions of the press advance downward to close the cavity. All parts of the press except the lower inner, or transfer, punch then move downward at the same speed to transfer powder to the extremities of the cavity. When transfer is complete both lower punches may be stopped, while the upper punches continue to advance.Type: GrantFiled: May 9, 1996Date of Patent: December 26, 2000Assignee: Stackpole LimitedInventor: Ing Gerd Hinzmann
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Patent number: 6143240Abstract: A method for making a high density powdered metal article is provided. In one embodiment, the composition consists of iron based powder, lubricant, graphite and ferro alloy additions. Satisfactory results may also be achieved by using fully prealloyed grades of metal powders, substantially pure powder blends, fully prealloyed powder blends, partially prealloyed powder blends and powder blends containing ferro alloys. The composition is compacted in rigid tools at ambient temperature, sintering at high temperature greater than 1100.degree. C. and then formed in rigid tools at 40 to 90 tons per square inch to a density greater than 94% of theoretical. The high density article is then annealed. The final article demonstrates remarkable mechanical properties which are atypical of powdered metal components and approach those of wrought steel.Type: GrantFiled: November 14, 1997Date of Patent: November 7, 2000Assignee: Stackpole LimitedInventors: Peter Jones, Roger Lawcock
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Patent number: 6120728Abstract: This invention relates to a device to compact parts with an undercut out of powder metal, including a pair of dies linearly moveable relative to one another and then phased, and an associated linearly displaceable pair of punches to produce said parts with said undercut.Type: GrantFiled: November 5, 1997Date of Patent: September 19, 2000Assignee: Stackpole LimitedInventors: Gerd Hinzmann, Mark Haiko, Keith Bukley-Golder, Robert Round, Alan Wilson, Frank Ma
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Patent number: 6110419Abstract: A method of densifying a sintered powder metal article by point contact.Type: GrantFiled: December 2, 1997Date of Patent: August 29, 2000Assignee: Stackpole LimitedInventors: Keith Buckley-Golder, Peter Jones, D. Sarafinchan
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Patent number: 6099772Abstract: This invention relates to a device to compact parts with an undercut out of powder material having an upper die moveable relative a lower die, at least one upper punch associated with the upper die for relative movement therebetween, at least two lower punches associated with said lower die for relative movement therebetween, the lower punches defining a lower cavity with the lower die for filling with the powder material when the dies are in an open position, the upper die contacting the lower die in a closed position for movement of one of the lower punches towards the upper die so as to transfer the powder material towards the upper die and then to compact the powder material between the upper and lower punches with said dies in the closed position so as to produce said part; said dies moveable to an eject position for ejection of the compacted part.Type: GrantFiled: April 18, 1997Date of Patent: August 8, 2000Assignee: Stackpole LimitedInventors: Gerd Hinzmann, Mark Haiko, Frank Ma, Allan Wilson, Keith Buckley-Golder, Robert Round
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Patent number: 6019937Abstract: A process of forming a sintered article of powder metal comprising blending graphite, Si carbide and lubricant, with pre-alloyed iron base powder; pressing said blended mixture to a shaped article; sintering said article in a reduced atmosphere; forced cooling said sintered article.Type: GrantFiled: November 27, 1998Date of Patent: February 1, 2000Assignee: Stackpole LimitedInventors: Rohith Shivanath, Karol Kucharski, Peter Jones
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Patent number: 5997805Abstract: A manufacturing method is provided for the production of high density, high carbon, sintered powder metal steels. The composition consists of iron based powder, graphite, lubricant, and possibly at least one alloying element from the group of chromium, copper, manganese, molybdenum, nickel, niobium or vanadium. The composition is compacted in rigid tools, sintered and during cooling an isothermal or slow cooling treatment is introduced between 650.degree. C. and 750.degree. C. The isothermal or slow cooling treatment may alternatively be applied during a heat treatment cycle that is carried out after a conventional sintering cycle. The material processed as described may then be formed to high density. Forming to high density is not practical with high carbon materials that have been processed by conventional methods. The high density article is then heat treated in a manner to suit specific product requirements.Type: GrantFiled: June 19, 1997Date of Patent: December 7, 1999Assignee: Stackpole LimitedInventors: Roger Lawcock, Peter Jones
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Patent number: 5881354Abstract: A method of making a sintered article of powder metal having a carbon composition in the range of about 0.8% to 2.0% by weight, then spheroidizing the sintered article and then warm forming the sintered article at a temperature between 250.degree. and 700.degree. C. for a time duration selected to form the article to a final shape.Type: GrantFiled: May 3, 1996Date of Patent: March 9, 1999Assignee: Stackpole LimitedInventors: Rohith Shivanath, Peter Jones
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Patent number: 5834640Abstract: This invention relates to a method or process of forming a sintered article of powder metal, and particularly relates to a process of forming a sintered article of powder metal by blending combinations of finely ground ferro alloys (either singly or in combination with other ferro alloys) with elemental iron powder and other additives and then high temperature sintering of the article in a reducing atmosphere to produce sintered parts with oxygen contents less than 250 parts per million (ppm). More particularly the ferro alloys admixed to the base iron have a mean particle size of approximately 8 to 12 microns, having previously been ground to size in an inert atmosphere.Type: GrantFiled: August 10, 1995Date of Patent: November 10, 1998Assignee: Stackpole LimitedInventors: Rohith Shivanath, Peter Jones
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Patent number: 5754937Abstract: A method for making a high density powdered metal article is provided. The composition consists of iron based powder, lubricant, graphite and ferro alloy additions. The composition is compacted in rigid tools at ambient temperature, sintered at high temperature and then formed in rigid tools at 40 to 90 tons per square inch to a density greater than 94% of theoretical. The high density article is then annealed. The final article demonstrates remarkable mechanical properties which are atypical of powdered metal components and approach those of wrought steel.Type: GrantFiled: May 15, 1996Date of Patent: May 19, 1998Assignee: Stackpole LimitedInventors: Peter Jones, Roger Lawcock
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Patent number: 5729822Abstract: A powder metal gear wheel having a core density of at least 7.3 g/cc, and in one embodiment 7.4 to 7.6 g/cc and a hardened carburized surface. A method of manufacturing transmission gears comprises, sintering a powder metal blank to produce a core density of between 7.4 to 7.6 g/cc, rolling the surface of the gear blank to densify the surface, and then heating the rolled sintered part and carburizing in a vacuum furnace.Type: GrantFiled: May 24, 1996Date of Patent: March 17, 1998Assignee: Stackpole LimitedInventors: Rohith Shivanath, Peter Jones
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Patent number: 5722815Abstract: A gerotor pump is described for use with non-compressible fluids such as automotive coolant or hydraulic oil. The pump includes three separate pump outlet ports, a bypass return passage, find an integral four position spool valve. Increasing back pressure from a downstream load is sensed be the spool valve which moves accordingly to restrict the fluid supplied. In the first position a full flow fluid is supplied to the load from all three ports. In the second position one port is vented to the bypass and the flow from the other two ports is directed to the load. In the third position two ports vent to bypass, and one ports drives the load. In the fourth position all ports vent to bypass. In each case flow vented to bypass is not first compressed, permitting a smaller motor to be used.Type: GrantFiled: August 14, 1995Date of Patent: March 3, 1998Assignee: Stackpole LimitedInventor: Eric R. Cozens