Patents by Inventor David A. Cornwell
David A. Cornwell 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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Publication number: 20210146996Abstract: In a broad respect, vehicles that are capable of making a low- to zero-radius turn using the independent rotation of drive wheels and by turning the non-driving steerable structure or structures (such as wheels) with a steering input device (in some embodiments, the driving wheels also may be capable of being turned). This may be accomplished using a steering system, a speed control system and an integration device (together, a control system) that are configured to work together to provide correct steering in forward and reverse, and, in some embodiments, to reduce the speed of the outboard drive wheel of the vehicle when it enters an extreme turn under constant speed input. Different systems configured for use in such vehicles are included.Type: ApplicationFiled: September 21, 2020Publication date: May 20, 2021Inventors: Axel Schaedler, Hans Hauser, Rick Ruebusch, Ian David Cornwell
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Patent number: 10780917Abstract: In a broad respect, vehicles that are capable of making a low- to zero-radius turn using the independent rotation of drive wheels and by turning the non-driving steerable structure or structures (such as wheels) with a steering input device (in some embodiments, the driving wheels also may be capable of being turned). This may be accomplished using a steering system, a speed control system and an integration device (together, a control system) that are configured to work together to provide correct steering in forward and reverse, and, in some embodiments, to reduce the speed of the outboard drive wheel of the vehicle when it enters an extreme turn under constant speed input. Different systems configured for use in such vehicles are included.Type: GrantFiled: March 20, 2015Date of Patent: September 22, 2020Assignee: MTD Products IncInventors: Axel Schaedler, Hans Hauser, Rick Ruebusch, Ian David Cornwell
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Patent number: 9409596Abstract: In a broad respect, vehicles that are capable of making a low- to zero-radius turn using the independent rotation of drive wheels and by turning the non-driving steerable structure or structures (such as wheels) with a steering input device (in some embodiments, the driving wheels also may be capable of being turned). This may be accomplished using a steering system, a speed control system and an integration device (together, a control system) that are configured to work together to provide correct steering in forward and reverse, and, in some embodiments, to reduce the speed of the outboard drive wheel of the vehicle when it enters an extreme turn under constant speed input. Different systems configured for use in such vehicles are included.Type: GrantFiled: April 6, 2011Date of Patent: August 9, 2016Assignee: MTD Products IncInventors: Hans Hauser, Ian David Cornwell
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Patent number: 9254865Abstract: In a broad respect, vehicles that are capable of making a low- to zero-radius turn using the independent rotation of drive wheels and by turning the non-driving steerable structure or structures (such as wheels) with a steering input device (in some embodiments, the driving wheels also may be capable of being turned). This may be accomplished using a steering system, a speed control system and an integration device (together, a control system) that are configured to work together to provide correct steering in forward and reverse, and, in some embodiments, to reduce the speed of the outboard drive wheel of the vehicle when it enters an extreme turn under constant speed input. Different systems configured for use in such vehicles are included.Type: GrantFiled: April 10, 2015Date of Patent: February 9, 2016Assignee: MTD Products IncInventors: Axel Schaedler, Hans Hauser, Rick Ruebusch, Ian David Cornwell
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Publication number: 20150353131Abstract: A transmission arrangement for an engine driven vehicle having two continuously variable transmissions serving to drive left and right hand vehicle wheels at separately variable drive ratios. Each transmission incorporates a variator of the type in which a net torque applied to the variator through its input and output is referred to a ratio control part, which may be formed as a control lever, whose position governs the transmission's drive ratio. The control parts of the variators are each operatively coupled to a driver's speed control, such that the speed control determines a mean position of the two control parts. However they are both also able to move relative to the mean position, under the influence of the torque they react. Additionally the control parts are coupled to each other such that any displacement of one control part from the mean position is accompanied by an opposite displacement of the other control part.Type: ApplicationFiled: December 30, 2014Publication date: December 10, 2015Inventors: Christopher John Greenwood, Ian David Cornwell
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Publication number: 20150217802Abstract: In a broad respect, vehicles that are capable of making a low- to zero-radius turn using the independent rotation of drive wheels and by turning the non-driving steerable structure or structures (such as wheels) with a steering input device (in some embodiments, the driving wheels also may be capable of being turned). This may be accomplished using a steering system, a speed control system and an integration device (together, a control system) that are configured to work together to provide correct steering in forward and reverse, and, in some embodiments, to reduce the speed of the outboard drive wheel of the vehicle when it enters an extreme turn under constant speed input. Different systems configured for use in such vehicles are included.Type: ApplicationFiled: April 10, 2015Publication date: August 6, 2015Inventors: Axel Schaedler, Hans Hauser, Rick Ruebusch, Ian David Cornwell
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Publication number: 20150191201Abstract: In a broad respect, vehicles that are capable of making a low- to zero-radius turn using the independent rotation of drive wheels and by turning the non-driving steerable structure or structures (such as wheels) with a steering input device (in some embodiments, the driving wheels also may be capable of being turned). This may be accomplished using a steering system, a speed control system and an integration device (together, a control system) that are configured to work together to provide correct steering in forward and reverse, and, in some embodiments, to reduce the speed of the outboard drive wheel of the vehicle when it enters an extreme turn under constant speed input. Different systems configured for use in such vehicles are included.Type: ApplicationFiled: March 20, 2015Publication date: July 9, 2015Inventors: Alex Schaedler, Hans Hauser, Rick Ruebusch, Ian David Cornwell
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Patent number: 8919464Abstract: A transmission arrangement for an engine driven vehicle having two continuously variable transmissions serving to drive left and right hand vehicle wheels at separately variable drive ratios. Each transmission incorporates a variator of the type in which a net torque applied to the variator through its input and output is referred to a ratio control part, which may be formed as a control lever, whose position governs the transmission's drive ratio. The control parts of the variators are each operatively coupled to a driver's speed control, such that the speed control determines a mean position of the two control parts. However they are both also able to move relative to the mean position, under the influence of the torque they react. Additionally the control parts are coupled to each other such that any displacement of one control part from the mean position is accompanied by an opposite displacement of the other control part.Type: GrantFiled: August 18, 2006Date of Patent: December 30, 2014Assignee: MTD Products Inc.Inventors: Christopher John Greenwood, Ian David Cornwell
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Patent number: 8695734Abstract: An arrangement and a method are disclosed for driving and steering an engine driven vehicle of the type m which left and right hand wheels 120L, 120R are respectively driven from the engine through left and right hand transmissions 122L, 122R and a steering effect is exerted by changing the ratio of one transmission relative to the other. According to the invention a follower is operatively coupled to at least one of the transmissions and is movable circumferentially about an axis by means of a driver actuable steering control to change the relative speeds of the two driven wheels and radially with respect to the axis by means of a driver actuable speed control to increase/decrease the speeds of the two driven wheels in unison.Type: GrantFiled: April 17, 2012Date of Patent: April 15, 2014Assignee: MTD Products IncInventors: Christopher John Greenwood, Ian David Cornwell
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Publication number: 20120298429Abstract: An arrangement and a method are disclosed for driving and steering an engine driven vehicle of the type m which left and right hand wheels 120L, 120R are respectively driven from the engine through left and right hand transmissions 122L, 122R and a steering effect is exerted by changing the ratio of one transmission relative to the other. According to the invention a follower is operatively coupled to at least one of the transmissions and is movable circumferentially about an axis by means of a driver actuable steering control to change the relative speeds of the two driven wheels and radially with respect to the axis by means of a driver actuable speed control to increase/decrease the speeds of the two driven wheels in unison.Type: ApplicationFiled: April 17, 2012Publication date: November 29, 2012Applicant: MTD PRODUCTS INCInventors: Christopher John Greenwood, Ian David Cornwell
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Publication number: 20120286806Abstract: A substrate is electromagnetically coupled into an inductance-capacitance resonant circuit formed from (i) a member comprising a ferromagnetic material, (ii) an inductor and (iii) the substrate. The substrate is illuminated for a first time period X to cause photoconduction in the substrate. Decay in conductivity of the substrate is monitored for a second time period Y. The ratio of X to Y is greater than 1:10. Bulk lifetime of the substrate is determined from the decay.Type: ApplicationFiled: November 9, 2011Publication date: November 15, 2012Inventors: Francisco Machuca, Ronald Chiarello, G. Lorimer Miller, Joseph W. Foster, David C. Tigwell, David Cornwell
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Patent number: 8157030Abstract: An arrangement and a method are disclosed for driving and steering an engine driven vehicle of the type m which left and right hand wheels 120L, 120R are respectively driven from the engine through left and right hand transmissions 122L, 122R and a steering effect is exerted by changing the ratio of one transmission relative to the other. According to the invention a follower is operatively coupled to at least one of the transmissions and is movable circumferentially about an axis by means of a driver actuable steering control to change the relative speeds of the two driven wheels and radially with respect to the axis by means of a driver actuable speed control to increase/decrease the speeds of the two driven wheels in unison.Type: GrantFiled: August 18, 2006Date of Patent: April 17, 2012Assignee: MTD Products IncInventors: Christopher John Greenwood, Ian David Cornwell
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Publication number: 20110248462Abstract: In a broad respect, vehicles that are capable of making a low- to zero-radius turn using the independent rotation of drive wheels and by turning the non-driving steerable structure or structures (such as wheels) with a steering input device (in some embodiments, the driving wheels also may be capable of being turned). This may be accomplished using a steering system, a speed control system and an integration device (together, a control system) that are configured to work together to provide correct steering in forward and reverse, and, in some embodiments, to reduce the speed of the outboard drive wheel of the vehicle when it enters an extreme turn under constant speed input. Different systems configured for use in such vehicles are included.Type: ApplicationFiled: April 6, 2011Publication date: October 13, 2011Applicant: INFINITRAK, LLCInventors: Axel Schaedler, Hans Hauser, Rick Ruebusch, Ian David Cornwell, Christopher John Greenwood
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Patent number: 7992659Abstract: In a broad respect, vehicles that are capable of making a low- to zero-radius turn using the independent rotation of drive wheels and by turning the non-driving steerable structure or structures (such as wheels) with a steering input device (in some embodiments, the driving wheels also may be capable of being turned). This may be accomplished using a steering system, a speed control system and an integration device (together, a control system) that are configured to work together to provide correct steering in forward and reverse, and, in some embodiments, to reduce the speed of the outboard drive wheel of the vehicle when it enters an extreme turn under constant speed input. Different systems configured for use in such vehicles are included.Type: GrantFiled: July 21, 2006Date of Patent: August 9, 2011Assignee: Infinitrak, LLCInventors: Axel Schaedler, Hans Hauser, Rick Ruebusch, Ian David Cornwell, Christopher John Greenwood
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Publication number: 20110053731Abstract: A transmission arrangement for an engine driven vehicle having two continuously variable transmissions serving to drive left and right hand vehicle wheels at separately variable drive ratios. Each transmission incorporates a variator of the type in which a net torque applied to the variator through its input and output is referred to a ratio control part, which may be formed as a control lever, whose position governs the transmission's drive ratio. The control parts of the variators are each operatively coupled to a driver's speed control, such that the speed control determines a mean position of the two control parts. However they are both also able to move relative to the mean position, under the influence of the torque they react. Additionally the control parts are coupled to each other such that any displacement of one control part from the mean position is accompanied by an opposite displacement of the other control part.Type: ApplicationFiled: August 18, 2006Publication date: March 3, 2011Inventors: Christopher John Greenwood, Ian David Cornwell
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Patent number: 7632208Abstract: A continuously variable ratio transmission unit having first and second discs mounted for rotation about a main axis, a toroidal cavity being defined between the discs by facing surfaces thereof and containing a plurality of rollers which serve to transmit drive from one disc to the other, each roller being coupled to a respective carriage through a respective bearing arrangement and each carriage being coupled at a first extremity to a first linear actuator and at a second extremity to a second linear actuator whereby the carriage is movable along a direction transverse to the main axis, the first and second linear actuators working in opposition to exert an adjustable net force on the carriage, the orientation of the carriage being constrained and the bearing arrangement being such as to enable the roller to rotate about a roller axis to thereby transmit drive from one of the discs to the other and also being such as to enable the roller axis to precess relative to the carriage to vary the transmission ratiType: GrantFiled: January 24, 2003Date of Patent: December 15, 2009Assignee: Torotrak (Development) LimitedInventors: Christopher John Greenwood, Andrew Damian Defrietas, Brian Joseph Dutson, Ian David Cornwell
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Publication number: 20090178862Abstract: An arrangement and a method are disclosed for driving and steering an engine driven vehicle of the type m which left and right hand wheels 120L, 120R are respectively driven from the engine through left and right hand transmissions 122L, 122R and a steering effect is exerted by changing the ratio of one transmission relative to the other. According to the invention a follower is operatively coupled to at least one of the transmissions and is movable circumferentially about an axis by means of a driver actuable steering control to change the relative speeds of the two driven wheels and radially with respect to the axis by means of a driver actuable speed control to increase/decrease the speeds of the two driven wheels in unison.Type: ApplicationFiled: August 18, 2006Publication date: July 16, 2009Inventors: Christopher John Greenwood, Ian David Cornwell
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Publication number: 20090006842Abstract: The description generally provides for systems and methods for a mobile communication network. Archives of seals can be sealed to protect the integrity of the seals and facilitate validation in the event a sealing party's sealed registration document is revoked. A document can be sealed multiple times to nest seals within other seals. Specific evidentiary metadata can be included by the sealing party. A main document including or associated with other documents can be sealed as a collection of documents. The seal of the main document can include external references to the files included in the main document to verify the external files were not changed or altered.Type: ApplicationFiled: June 26, 2007Publication date: January 1, 2009Inventors: John Gordon Ross, Michael Wymark Clarke, David Cornwell
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Publication number: 20060159464Abstract: A method and apparatus is provided for obtaining status information concerning an optical transmission path. The method begins by generating a COTDR probe signal having a prescribed wavelength and transmitting optical traffic signals and the COTDR probe signal over an optical transmission path having a length corresponding to those used in regional undersea market applications. The prescribed wavelength of the COTDR probe signal is separated from wavelengths at which the optical traffic signals are located by a distance at least equal to a predetermined guard band. A backscattered and/or reflected portion of the COTDR probe signal in which status information concerning the optical path is embodied is received over the optical path. The backscattered and/or reflected portion of the COTDR probe signal is detected to obtain the status information.Type: ApplicationFiled: January 7, 2005Publication date: July 20, 2006Inventors: William David Cornwell, Henry Edwards, Stephen Evangelides, Jonathan Nagel, Nigel Taylor, Glenn Ahern, Stephen Smith
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Patent number: 7018320Abstract: A control unit for an infinitely-variable-ratio transmission. The transmission includes a cylinder and a piston with a proximal and a distal end. A support stem is connected to the piston. The piston is hollow and has a head portion for interaction with an associated actuation fluid. A proximal portion extends away from the head portion. The support stem is connected to the proximal portion by an articulated joint and extends from the joint to the head portion to exit from the distal end of the piston.Type: GrantFiled: November 29, 2001Date of Patent: March 28, 2006Assignee: Torotrak (Development) LimitedInventors: Leslie Kendrick Robinson, Ian David Cornwell, Brian Joseph Dutson