Patents by Inventor Gregory W. Hahn
Gregory W. Hahn 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: 6695201Abstract: A lower shell for a sealed compressor includes a shape with a plurality of intricate bends. In particular, u-shaped sections are stamped into a plainer sheet of material to form the lower shell. This stamping process can cause brittleness in the lower shell. Thus, after the stamping process, the lower shell is subjected to a heat-treating process to reduce the brittleness. After the heat-treating process a center shell is welded to the lower shell.Type: GrantFiled: August 23, 2001Date of Patent: February 24, 2004Assignee: Scroll TechnologiesInventors: Sudarshan K. Narasipura, Gregory W. Hahn
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Patent number: 6634874Abstract: A low cost protective clutch member is positioned adjacent an end of the drive shaft in a scroll compressor. The device is a thin washer having a tab which is selectively driven against the housing stop when the compressor is driven in a forward direction, but is movable into a notch in the shaft when the shaft is driven in a reverse direction. The tab prevents rotation of the shaft when in the notch.Type: GrantFiled: June 11, 2002Date of Patent: October 21, 2003Assignee: Scroll TechnologiesInventors: James W. Bush, John R. Williams, Zili Sun, Carlos Zamudio, Jason Hugenroth, Gregory W. Hahn, Thomas R. Barito, Joseph T. Hill
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Patent number: 6592344Abstract: The present invention is for the retention of a heat shield for a scroll compressor. In one embodiment, the heat shield is deformed into a position such that it rests in a groove located in the non-orbiting scroll. In another embodiment the housing end cap deforms the heat shield. The deformed position of the heat shield prevents flexing and vibrating found in heat shields of prior art. In addition the heat shield must have holes in it to allow for the discharge valve to pass through. The present invention is to put slots in the heat shield, thus preventing the need for exact alignment of the heat shield in position.Type: GrantFiled: November 29, 2001Date of Patent: July 15, 2003Assignee: Scroll TechnologiesInventors: Robert Carl Witham, Marvin Wayne Burchfield, Gregory W. Hahn, Brad Allen Meeks
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Publication number: 20030099564Abstract: The present invention is for the retention of a heat shield for a scroll compressor. In one embodiment, the heat shield is deformed into a position such that it rests in a groove located in the non-orbiting scroll. In another embodiment the housing end cap forms the heat shield. The deformed position of the heat shield prevents flexing and vibrating found in heat shields of prior art. In addition the heat shield must have holes in it to allow for the discharge valve to pass through. The present invention is to put slots in the heat shield, thus preventing the need for exact alignment of the heat shield in position.Type: ApplicationFiled: November 29, 2001Publication date: May 29, 2003Inventors: Robert Carl Witham, Marvin Wayne Burchfield, Gregory W. Hahn, Brad Allen Meeks
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Patent number: 6566841Abstract: A system includes a motor mounted within a housing and a compressor pump unit. A single-phase PSC motor includes a switch assembly which selectively connects primary or alternate windings. During normal load operation, when maximum efficiency is desired, the switch is placed in one position, then during high load operation, when maximum torque output is needed at maximum a load point, the switch is placed in the closed position. In effect, the number of main winding turns is decreased and the motor is strengthened. As the auxiliary capacitors are also now connected in parallel, the net effect is an increase in the total auxiliary capacitance, which also serves to strengthen the motor. Another embodiment provides a switch for a three-phase WYE connected motor. In yet another embodiment, a three phase delta connected motor switch is provided.Type: GrantFiled: February 8, 2001Date of Patent: May 20, 2003Assignee: Scroll TechnologiesInventors: James W. Bush, John R. Williams, Zili Sun, Carlos Zamudio, Jason Hugenroth, Gregory W. Hahn, Thomas Barito, Joe T. Hill
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Publication number: 20030039562Abstract: A lower shell for a sealed compressor includes a shape with a plurality of intricate bends. In particular, u-shaped sections are stamped into a plainer sheet of material to form the lower shell. This stamping process can cause brittleness in the lower shell. Thus, after the stamping process, the lower shell is subjected to a heat-treating process to reduce the brittleness. After the heat-treating process a center shell is welded to the lower shell.Type: ApplicationFiled: August 23, 2001Publication date: February 27, 2003Inventors: Sudarshan K. Narasipura, Gregory W. Hahn
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Publication number: 20020150490Abstract: A low cost protective clutch member is positioned adjacent an end of the drive shaft in a scroll compressor. The device is a thin washer having a tab which is selectively driven against the housing stop when the compressor is driven in a forward direction, but is movable into a notch in the shaft when the shaft is driven in a reverse direction. The tab prevents rotation of the shaft when in the notch.Type: ApplicationFiled: June 11, 2002Publication date: October 17, 2002Inventors: James W. Bush, John R. Williams, Zili Sun, Carlos Zamudio, Jason Hugenroth, Gregory W. Hahn, Thomas R. Barito, Joseph T. Hill
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Patent number: 6464470Abstract: A variable size is provided for a discharge port in a scroll compressor. The variable size is movable dependent on conditions within the scroll compressor to achieve a desired pressure ratio based upon operational conditions in the compressor or an associated refrigerant cycle. In one embodiment a plunger moves axially to increase or decrease the size of a discharge port. In a second embodiment, the plunger rotates about an axis and has a groove that is selectively aligned with the port to increase or decrease the effective size of the port.Type: GrantFiled: November 6, 2000Date of Patent: October 15, 2002Assignee: Scroll TechnologiesInventors: Carlos Zamudio, Joe T. Hill, Gregory W. Hahn, Zili Sun, Jason Hugenroth, Thomas Barito, John R. Williams, James W. Bush
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Publication number: 20020136651Abstract: A sealed compressor includes a lower end cap with a u-shaped hump extending around its periphery. A weld reinforcement which is preferably a ring is welded between inner and outer legs of the u-shaped hump. The weld reinforcement ring bears a good deal of stress from internal pressures, and results in a more long-lasting housing.Type: ApplicationFiled: March 23, 2001Publication date: September 26, 2002Applicant: Scroll TechnologiesInventors: Zili Sun, Gregory W. Hahn, Sudarshan K. Narasipura
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Patent number: 6454550Abstract: A sealed compressor includes a lower end cap with a u-shaped hump extending around its periphery. A weld reinforcement which is preferably a ring is welded between inner and outer legs of the u-shaped hump. The weld reinforcement ring bears a good deal of stress from internal pressures, and results in a more long-lasting housing.Type: GrantFiled: March 23, 2001Date of Patent: September 24, 2002Assignee: Scroll TechnologiesInventors: Zili Sun, Gregory W. Hahn, Sudarshan K. Narasipura
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Publication number: 20020105301Abstract: A system includes a motor mounted within a housing and a compressor pump unit. A single-phase PSC motor includes a switch assembly which selectively connects primary or alternate windings. During normal load operation, when maximum efficiency is desired, the switch is placed in one position, then during high load operation, when maximum torque output is needed at maximum a load point, the switch is placed in the closed position. In effect, the number of main winding turns is decreased and the motor is strengthened. As the auxiliary capacitors are also now connected in parallel, the net effect is an increase in the total auxiliary capacitance, which also serves to strengthen the motor. Another embodiment provides a switch for a three-phase WYE connected motor. In yet another embodiment, a three phase delta connected motor switch is provided.Type: ApplicationFiled: February 8, 2001Publication date: August 8, 2002Applicant: Scroll TechnologiesInventors: James W. Bush, John R. Williams, Zili Sun, Carlos Zamudio, Jason Hugenroth, Gregory W. Hahn, Thomas Barito, Joe T. Hill
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Patent number: 6428293Abstract: An improved heat shield for a scroll compressor is provided with a non-cylindrical end portion caught between the end cap and the non-orbiting scroll. In several embodiments, the portion provides a seal between the discharge chamber and a suction chamber. In one embodiment the portion of the heat shield is serpentine. In another embodiment the portion of the heat shield is generally u-shaped. In further embodiments the portion includes a plurality of circumferentially spaced clips. Several other embodiments are also disclosed.Type: GrantFiled: April 9, 2001Date of Patent: August 6, 2002Assignee: Scroll TechnologiesInventors: Todd W. Dewar, Zili Sun, Thomas R. Barito, Robert C. Witham, Gregory W. Hahn
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Patent number: 6418740Abstract: An unloader valve for a scroll compressor to selectively communicate suction and discharge is positioned outwardly of the compressor housing. In this way, the unloader valve is ideally positioned to address several system failures. As an example, loss or charge, reverse running, fan failure, etc. are all addressed in an efficient and quick manner. The unloader valve may be the normal unloader valve controlled by a system control which also selectively controls capacity. The unloader valve control is modified such that it is also operable to open the unloader valve when a system failure is detected.Type: GrantFiled: February 22, 2001Date of Patent: July 16, 2002Assignee: Scroll TechnologiesInventors: John R. Williams, Gregory W. Hahn, Carlos Zamudio, Joe T. Hill, Zili Sun, Jason Hugenroth, Thomas Barito, James W. Bush
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Patent number: 6379133Abstract: An improved check valve for a scroll compressor has a stop body which has a contact face which is reduced in surface area to reduce the stiction or holding force holding the valve at shut down. In this way, the valve is allowed to move to its closed position more rapidly.Type: GrantFiled: November 28, 2000Date of Patent: April 30, 2002Assignee: Scroll TechnologiesInventors: Gregory W. Hahn, Todd W. Dewar, David M. Fenocchi, John R. Williams, Tracy L. Milliff
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Patent number: 6354821Abstract: A simplified drive arrangement is provided to allow a scroll compressor to be operated at two capacity levels by a reversible electric motor. A pair of one-way clutches are positioned on a pair of parallel shafts. When the motor is driven in a forward direction drive passes through one of the one-way clutches and directly to the orbiting scroll. However, when the motor is driven in a reverse direction, drive passes through a countershaft, which in turn passes through a second one-way clutch. The drive passing through the second one-way clutch will result in the orbiting scroll being driven at a distinct speed then when the motor is driven in a reverse direction. In this way, capacity modulation is achieved with a very simple mechanism.Type: GrantFiled: November 22, 2000Date of Patent: March 12, 2002Assignee: Scroll TechnologiesInventors: Gregory W. Hahn, Carlos Zamudio, Joe T. Hill, Zili Sun, Jason Hugenroth, Thomas Barito, John R. Williams, James W. Bush
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Patent number: 6352417Abstract: A scroll compressor is provided with structure between its slider block and its eccentric pin that allows relative movement, but limits such movement. In one embodiment, a spring biased piston resists relative movement between the slider block and the eccentric pin. In another embodiment, incrementally spaced indexed surfaces are defined. With either embodiment the amount of relative movement of the slider block is limited relative to the eccentric pin and hence between the wraps of the orbiting scrolls. This will result in quieter operation.Type: GrantFiled: November 6, 2000Date of Patent: March 5, 2002Assignee: Scroll TechnologiesInventors: Carlos Zamudio, Joe T. Hill, Gregory W. Hahn, Zili Sun, Jason Hugenroth, Thomas Barito, John R. Williams, James W. Bush
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Patent number: 6193484Abstract: A scroll compressor is assembled by force-fitting the pump unit and the lower bearing into the generally cylindrical outer housing. The force-fit holding strength is increased by providing both the crankcase and the bearing support with cylindrical portions. Thus, force-fit holding strength is provided over the entire periphery of the elements. The structure preferably takes the outer housing beyond its plastic yield point, also increasing the hold strength. In this way, the relatively simple method of force-fitting may be utilized to assemble the scroll compressor, while still achieving acceptable holding force.Type: GrantFiled: October 21, 1998Date of Patent: February 27, 2001Assignee: Scroll TechnologiesInventors: Gregory W. Hahn, Jason J. Hugenroth