Patents by Inventor Patrick S. Dillman
Patrick S. Dillman 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: 20190316650Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.Type: ApplicationFiled: June 28, 2019Publication date: October 17, 2019Applicant: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Publication number: 20190308480Abstract: A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.Type: ApplicationFiled: June 24, 2019Publication date: October 10, 2019Applicant: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
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Patent number: 10369860Abstract: A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper includes a housing having a wall that at least partially surrounds at least a portion of the primary damper, the volume between the wall and the primary damper defining a chamber, and the wall defines an aperture. The secondary damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a valve disposed along the flow path. The secondary damper is configured to provide a damping force that varies based on the position of the piston within the chamber.Type: GrantFiled: November 6, 2017Date of Patent: August 6, 2019Assignee: Oshkosh CorporationInventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
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Patent number: 10350956Abstract: A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.Type: GrantFiled: April 16, 2018Date of Patent: July 16, 2019Assignee: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
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Publication number: 20180335104Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.Type: ApplicationFiled: July 20, 2018Publication date: November 22, 2018Applicant: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Publication number: 20180229569Abstract: A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.Type: ApplicationFiled: April 16, 2018Publication date: August 16, 2018Applicant: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
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Patent number: 10030737Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The rod extends within the inner volume. The primary piston is positioned within the inner volume and coupled to the rod. The primary piston defines a first contact surface. The secondary piston includes a body member having a second contact surface, an opposing second surface, and an inner cylindrical face defining a central aperture that receives the rod. The secondary piston defines a channel extending from the inner cylindrical face to an outer periphery of the body member. The first contact surface and the channel are configured to cooperatively define a flow conduit upon engagement between the primary piston and the secondary piston.Type: GrantFiled: March 29, 2016Date of Patent: July 24, 2018Assignee: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Patent number: 9944145Abstract: A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.Type: GrantFiled: April 10, 2015Date of Patent: April 17, 2018Assignee: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
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Publication number: 20180056746Abstract: A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper includes a housing having a wall that at least partially surrounds at least a portion of the primary damper, the volume between the wall and the primary damper defining a chamber, and the wall defines an aperture. The secondary damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a valve disposed along the flow path. The secondary damper is configured to provide a damping force that varies based on the position of the piston within the chamber.Type: ApplicationFiled: November 6, 2017Publication date: March 1, 2018Applicant: Oshkosh Defense, LLCInventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
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Patent number: 9809080Abstract: A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper includes a housing having a wall that at least partially surrounds at least a portion of the primary damper, the volume between the wall and the primary damper defining a chamber, and the wall defines an aperture. The secondary damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a valve disposed along the flow path. The primary damper is configured to provide a base damping force and the secondary damper is configured to provide a supplemental damping force that varies based on the position of the piston within the chamber.Type: GrantFiled: February 19, 2016Date of Patent: November 7, 2017Assignee: Oshkosh Defense, LLCInventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
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Publication number: 20160208883Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The rod extends within the inner volume. The primary piston is positioned within the inner volume and coupled to the rod. The primary piston defines a first contact surface. The secondary piston includes a body member having a second contact surface, an opposing second surface, and an inner cylindrical face defining a central aperture that receives the rod. The secondary piston defines a channel extending from the inner cylindrical face to an outer periphery of the body member. The first contact surface and the channel are configured to cooperatively define a flow conduit upon engagement between the primary piston and the secondary piston.Type: ApplicationFiled: March 29, 2016Publication date: July 21, 2016Applicant: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Publication number: 20160167475Abstract: A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper includes a housing having a wall that at least partially surrounds at least a portion of the primary damper, the volume between the wall and the primary damper defining a chamber, and the wall defines an aperture. The secondary damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a valve disposed along the flow path. The primary damper is configured to provide a base damping force and the secondary damper is configured to provide a supplemental damping force that varies based on the position of the piston within the chamber.Type: ApplicationFiled: February 19, 2016Publication date: June 16, 2016Applicant: Oshkosh Defense, LLCInventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
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Patent number: 9303715Abstract: A damper assembly is disclosed that includes a tubular member, a rod, a primary piston, a secondary piston, and a seal. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap defining an inner volume. The rod extends within the inner volume of the tubular member. The primary piston defines a contact surface and is positioned within the inner volume and coupled to an end of the rod. The secondary piston defines a central aperture and a channel. Engagement of the primary piston and the secondary piston forms a flow conduit between the channel and the contact surface. The seal is disposed between an outer surface of the secondary piston and the sidewall such that a flow path is formed through the central aperture and the flow conduit.Type: GrantFiled: March 10, 2013Date of Patent: April 5, 2016Assignee: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Patent number: 9291230Abstract: A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper coupled to the primary damper. The secondary damper includes a housing, a piston, a conduit, and a valve. The housing includes a sidewall that defines a set of apertures and at least partially surrounds the primary damper, and the volume between the sidewall and the primary damper defines a damping chamber. The piston is positioned within the damping chamber and is slidably coupled to the sidewall. The conduit forms a flow path between the set of apertures, and the valve is disposed along the flow path. The primary damper provides a base damping force, and the secondary damper provides a supplemental damping force that varies based on the position of the piston along the housing.Type: GrantFiled: July 17, 2014Date of Patent: March 22, 2016Assignee: Oshkosh Defense, LLCInventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
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Publication number: 20150290993Abstract: A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.Type: ApplicationFiled: April 10, 2015Publication date: October 15, 2015Applicant: OSHKOSH DEFENSE, LLCInventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
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Publication number: 20140326555Abstract: A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper coupled to the primary damper. The secondary damper includes a housing, a piston, a conduit, and a valve. The housing includes a sidewall that defines a set of apertures and at least partially surrounds the primary damper, and the volume between the sidewall and the primary damper defines a damping chamber. The piston is positioned within the damping chamber and is slidably coupled to the sidewall. The conduit forms a flow path between the set of apertures, and the valve is disposed along the flow path. The primary damper provides a base damping force, and the secondary damper provides a supplemental damping force that varies based on the position of the piston along the housing.Type: ApplicationFiled: July 17, 2014Publication date: November 6, 2014Inventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
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Publication number: 20140251742Abstract: A damper assembly is disclosed that includes a tubular member, a rod, a primary piston, a secondary piston, and a seal. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap defining an inner volume. The rod extends within the inner volume of the tubular member. The primary piston defines a contact surface and is positioned within the inner volume and coupled to an end of the rod. The secondary piston defines a central aperture and a channel. Engagement of the primary piston and the secondary piston forms a flow conduit between the channel and the contact surface. The seal is disposed between an outer surface of the secondary piston and the sidewall such that a flow path is formed through the central aperture and the flow conduit.Type: ApplicationFiled: March 10, 2013Publication date: September 11, 2014Applicant: OSHKOSH CORPORATIONInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Patent number: 8801017Abstract: A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper is coupled to the primary damper and includes a housing and an annular piston. The housing includes a sidewall that partially surrounds the primary damper, and the volume between the sidewall and the primary damper defines a damping chamber. The sidewall defines a plurality of apertures. The annular piston is positioned within the damping chamber and slidably coupled to the sidewall. The primary damper provides a base damping force and the secondary damper provides a supplemental damping force that varies based on the position of the annular piston along the housing.Type: GrantFiled: March 10, 2013Date of Patent: August 12, 2014Assignee: Oshkosh CorporationInventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
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Publication number: 20130249183Abstract: A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper is coupled to the primary damper and includes a housing and an annular piston. The housing includes a sidewall that partially surrounds the primary damper, and the volume between the sidewall and the primary damper defines a damping chamber. The sidewall defines a plurality of apertures. The annular piston is positioned within the damping chamber and slidably coupled to the sidewall. The primary damper provides a base damping force and the secondary damper provides a supplemental damping force that varies based on the position of the annular piston along the housing.Type: ApplicationFiled: March 10, 2013Publication date: September 26, 2013Applicant: OSHKOSH CORPORATIONInventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger