Patents by Inventor David R. Polak
David R. Polak 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: 11643301Abstract: This disclosure relates to a system and method for monitoring a sheave bearing condition, and in particular relates to passenger conveyer systems, such as elevator systems, employing the system and method. An example passenger conveyer system includes a suspension member, and a sheave configured to rotate on a bearing. The suspension member is wrapped around at least a portion of the sheave. Further, the system includes a sensor mounted adjacent an end of the suspension member, and a controller configured to determine a condition of the bearing based on an output of the sensor.Type: GrantFiled: October 28, 2019Date of Patent: May 9, 2023Assignee: OTIS ELEVATOR COMPANYInventors: Yan Chen, David R. Polak, Paul R. Braunwart, Zaffir A. Chaudhry, Charles C. Coffin
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Publication number: 20210122608Abstract: This disclosure relates to a system and method for monitoring a sheave bearing condition, and in particular relates to passenger conveyer systems, such as elevator systems, employing the system and method. An example passenger conveyer system includes a suspension member, and a sheave configured to rotate on a bearing. The suspension member is wrapped around at least a portion of the sheave. Further, the system includes a sensor mounted adjacent an end of the suspension member, and a controller configured to determine a condition of the bearing based on an output of the sensor.Type: ApplicationFiled: October 28, 2019Publication date: April 29, 2021Inventors: Yan Chen, David R. Polak, Paul R. Braunwart, Zaffir A. Chaudhry, Charles C. Coffin
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Publication number: 20210101776Abstract: A method of controlling operation of an elevator system (2), the elevator system (2) including a hoistway (4) extending between a plurality of landings (8) situated on different floors (9), and at least one elevator car (6) configured for moving along the hoistway (4) between the plurality of landings (8). The method includes receiving a control input indicating a passenger transport request, wherein the control input comprises at least one passenger transport request parameter; monitoring passengers (30) within or outside the elevator car (6) and determining at least one passenger parameter associated with the passengers (30); comparing the at least one passenger transport request parameter with the at least one passenger parameter; and controlling further operation of the elevator system (2) based on the result of said comparison.Type: ApplicationFiled: October 2, 2020Publication date: April 8, 2021Inventors: Stephen R. Nichols, Matteo Rucco, Jose Miguel Pasini, Cecilia Tonelli, Andrea De Antoni, David R. Polak
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Publication number: 20210024326Abstract: A method for crowd prediction in an elevator system includes logging the number of calls across a period of time and generating a first time series for an average number of calls; collecting external influence data and generating a second time series for the external influence data; performing a cross-correlation test on the first and second time series; when a cross-correlation between the first and second time series is determined, performing a causality test on the first and second time series; and when a causal relationship between the first and second time series is determined, using the causal relationship to predict an expected number of calls in the elevator system.Type: ApplicationFiled: July 22, 2020Publication date: January 28, 2021Inventors: David R. Polak, Stephen Richard Nichols, Matteo Rucco, Cecilia Tonelli, Andrea De Antoni, Jose Miguel Pasini, Giacomo Gentile
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Patent number: 10773929Abstract: A belted elevator system (10) includes a hoistway (14) and an elevator car (12) suspended in the hoistway (14) via a suspension member (16) and drivable along the hoistway (14). The suspension member (16) is routed over a plurality of sheaves (18). A sheave (18) of the plurality of sheaves includes a shaft (36) defining a central axis of the sheave (18), the sheave (18) rotatable about the central axis. A sheave outer member (38) is operably connected to the shaft (36) and rotatable about the central axis. The sheave outer member (38) includes a sheave outer surface (44) interactive with the suspension member (16). The sheave outer member (38) is formed from a molded plastic material.Type: GrantFiled: July 30, 2015Date of Patent: September 15, 2020Assignee: OTIS ELEVATOR COMPANYInventors: Jun Ma, Peter Keyo, Brad Guilani, Gopal R. Krishnan, David J. Lanesey, John P. Wesson, David R. Polak, Vijay Jagdale
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Patent number: 10336581Abstract: The present invention is directed to an elevator system. The elevator system comprises a car, a counterweight, at least one belt connecting the car and counterweight, and at least one sheave having a surface that engages with the belt. At least part of the surface of the sheave that interfaces with the belt has a plurality of features for reducing unwanted noise created due to the interaction between the belt and the sheave surface.Type: GrantFiled: January 21, 2011Date of Patent: July 2, 2019Assignee: OTIS ELEVATOR COMPANYInventors: David R. Polak, Christopher T. Chipman, Charles C Coffin, Arthur Blanc, John P. Wesson, Yan Chen, Daniel G. Opoku, Sergei F. Burlatsky
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Patent number: 10246300Abstract: An elevator car (20) comprises: a cab (24) having a top, a bottom, a left side, a right side, a front, and a back, the front having a door (50); and a frame (22) supporting the cab. The cab comprises a perimeter shroud (120; 320; 420; 620) protruding above a surface of the top and leaving a well (130) exposing a central portion of an upper surface (60) of the top; the perimeter shroud protrudes above the upper surface; and the perimeter shroud has, in vertical section, a curved portion.Type: GrantFiled: June 17, 2016Date of Patent: April 2, 2019Assignee: Otis Elevator CompanyInventors: David R. Polak, Ray-Sing Lin, David E. Parekh, Mark S. Thompson
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Patent number: 9815667Abstract: A method for applying a coating to a substrate includes obtaining a fluorinated polymer compound, where the fluorine is chemically or covalently bonded to the polymer molecule; and coating the surface of the substrate with the fluorinated polymer compound.Type: GrantFiled: May 16, 2012Date of Patent: November 14, 2017Assignee: OTIS ELEVATOR COMPANYInventors: Xiaomei Yu, Yan Chen, David R. Polak, Daniel V. Viens, John P. Wesson
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Publication number: 20170267497Abstract: A belted elevator system (10) includes a hoistway (14) and an elevator car (12) suspended in the hoistway (14) via a suspension member (16) and drivable along the hoistway (14). The suspension member (16) is routed over a plurality of sheaves (18). A sheave (18) of the plurality of sheaves includes a shaft (36) defining a central axis of the sheave (18), the sheave (18) rotatable about the central axis. A sheave outer member (38) is operably connected to the shaft (36) and rotatable about the central axis. The sheave outer member (38) includes a sheave outer surface (44) interactive with the suspension member (16). The sheave outer member (38) is formed from a molded plastic material.Type: ApplicationFiled: July 30, 2015Publication date: September 21, 2017Inventors: Jun Ma, Peter Keyo, Brad Guilani, Gopal R. Krishnan, David J. Lanesey, John P. Wesson, David R. Polak, Vijay Jagdale
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Publication number: 20170261058Abstract: A method of manufacturing an elevator safety spring is provided. The method includes determining a plurality of dimensional parameters of the elevator safety spring. The method also includes selecting a plurality of dimensions within the dimensional parameters. The method further includes manufacturing the elevator safety spring based on the selected parameters, the elevator safety spring having an I-beam cross-section.Type: ApplicationFiled: March 7, 2017Publication date: September 14, 2017Inventors: Shihemn Chen, Joe J. Liou, Andrzej Ernest Kuczek, Tahany Ibrahim El-Wardany, Xiaodong Luo, David R. Polak, James M. Draper, John J. Kriss, Duan Liang, Patricia L. O'Coin, Aayush Desai
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Patent number: 9630806Abstract: A method for constructing an interface between a sheave and a coated belt or rope of an elevator system, includes determining the surface energy of a surface of a coated belt or rope; and selecting a sheave such that the sheave has a work of adhesion between the coated belt or rope and the sheave, the work of adhesion meeting a defined relationship with a work of adhesion threshold.Type: GrantFiled: May 16, 2012Date of Patent: April 25, 2017Assignee: OTIS ELEVATOR COMPANYInventors: John P. Wesson, Xiaomei Yu, David R. Polak
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Publication number: 20170001838Abstract: An elevator car (20) comprises: a cab (24) having a top, a bottom, a left side, a right side, a front, and a back, the front having a door (50); and a frame (22) supporting the cab. The cab comprises a perimeter shroud (120; 320; 420; 620) protruding above a surface of the top and leaving a well (130) exposing a central portion of an upper surface (60) of the top; the perimeter shroud protrudes above the upper surface; and the perimeter shroud has, in vertical section, curved portion.Type: ApplicationFiled: June 17, 2016Publication date: January 5, 2017Applicant: Otis Elevator CompanyInventors: David R. Polak, Ray-Sing Lin, David E. Parekh, Mark S. Thompson
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Publication number: 20150166307Abstract: A method for applying a coating to a substrate includes obtaining a fluorinated polymer compound, where the fluorine is chemically or covalently bonded to the polymer molecule; and coating the surface of the substrate with the fluorinated polymer compound.Type: ApplicationFiled: May 16, 2012Publication date: June 18, 2015Applicant: OTIS ELEVATOR COMPANYInventors: Xiaomei Yu, Yan Chen, David R. Polak, Daniel V. Viens, John P. Wesson
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Publication number: 20150129366Abstract: A method for constructing an interface between a sheave and a coated belt or rope of an elevator system, includes determining the surface energy of a surface of a coated belt or rope; and selecting a sheave such that the sheave has a work of adhesion between the coated belt or rope and the sheave, the work of adhesion meeting a defined relationship with a work of adhesion threshold.Type: ApplicationFiled: May 16, 2012Publication date: May 14, 2015Inventors: John P. Wesson, Xiaomei Yu, David R. Polak
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Publication number: 20130292211Abstract: The present invention is directed to an elevator system. The elevator system comprises a car, a counterweight, at least one belt connecting the car and counterweight, and at least one sheave having a surface that engages with the belt. At least part of the surface of the sheave that interfaces with the belt has a plurality of features for reducing unwanted noise created due to the interaction between the belt and the sheave surface.Type: ApplicationFiled: January 21, 2011Publication date: November 7, 2013Inventors: David R. Polak, Christopher T. Chipman, Charles C. Coffin, Arthur Blanc, John P. Wesson, Yan Chen, Daniel G. Opoku, Sergei F. Burlatsky
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Patent number: 8167540Abstract: A system for reducing compressor noise includes a rotor having a plurality of blades. The blades have a nominal geometry characterized by a blade parameter. At least some of the blades are mistuned, such that they differ from the nominal geometry by greater than a manufacturing tolerance in the blade parameter. The blades produce shock waves at a blade passing frequency, and the mistuned blades shift acoustic energy away from the blade passing frequency to multiple lower amplitude tones at other frequencies. The system is configurable to be deployed with an inlet silencer that preferentially absorbs acoustic energy at some of the shifted frequencies.Type: GrantFiled: January 30, 2008Date of Patent: May 1, 2012Assignee: Hamilton Sundstrand CorporationInventors: Robert Hans Schlinker, James C. Napier, David R. Polak, Ray-Sing Lin, Scott A. Liljenberg, Anthony C. Jones
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Publication number: 20090191047Abstract: A system for reducing compressor noise includes a rotor having a plurality of blades. The blades have a nominal geometry characterized by a blade parameter. At least some of the blades are mistuned, such that they differ from the nominal geometry by greater than a manufacturing tolerance in the blade parameter. The blades produce shock waves at a blade passing frequency, and the mistuned blades shift acoustic energy away from the blade passing frequency to multiple lower amplitude tones at other frequencies. The system is configurable to be deployed with an inlet silencer that preferentially absorbs acoustic energy at some of the shifted frequencies.Type: ApplicationFiled: January 30, 2008Publication date: July 30, 2009Applicant: Hamilton Sundstrand CorporationInventors: Robert Hans Schlinker, James C. Napier, David R. Polak, Ray-Sing Lin, Scott A. Liljenberg, Anthony C. Jones