Patents by Inventor Charles Dunlap
Charles Dunlap 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: 11926390Abstract: Flat mount brake calipers for bicycles are described herein. An example flat mount brake caliper includes a caliper body defining a first piston cylinder and a second piston cylinder. The caliper body has a flat mount surface with a first threaded bore and a second threaded bore extending into the flat mount surface. The first and second threaded bores are configured to receive threaded fasteners to couple the caliper body to a frame of the bicycle. The first and second piston cylinders are arranged such that projections of the first and second threaded bores do not intersect the first or second piston cylinders. The flat mount brake caliper also includes a brake pad and first and second pistons disposed in the respective first and second piston cylinders to move the brake pad relative to the caliper body.Type: GrantFiled: January 17, 2022Date of Patent: March 12, 2024Assignee: SRAM, LLCInventor: Charles Dunlap
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Patent number: 11912372Abstract: A control device for a hydraulic brake for a bicycle includes a reservoir for hydraulic fluid. The reservoir has a variable volume. The control device also includes a reservoir cover at least partially defining the reservoir, and a support that is attachable to a handlebar of the bicycle via an inner annular surface of the support. A handlebar proximity zone is radially outer relative to the inner annular surface of the support and is within two centimeters of the inner annular surface of the support. At least part of the reservoir cover is within the handlebar proximity zone.Type: GrantFiled: December 14, 2020Date of Patent: February 27, 2024Assignee: SRAM, LLCInventors: Charles Dunlap, Brian Jordan, Braden Snead
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Publication number: 20230356802Abstract: A control device for a hydraulic brake for a bicycle includes a reservoir for hydraulic fluid. The reservoir has a variable volume. The control device also includes a reservoir cover at least partially defining the reservoir, and a support that is attachable to a handlebar of the bicycle via an inner annular surface of the support. A handlebar proximity zone is radially outer relative to the inner annular surface of the support and is within two centimeters of the inner annular surface of the support. At least part of the reservoir cover is within the handlebar proximity zone.Type: ApplicationFiled: July 17, 2023Publication date: November 9, 2023Applicant: SRAM, LLCInventors: CHARLES DUNLAP, BRIAN JORDAN, BRADEN SNEAD
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Patent number: 11794848Abstract: A control device for a hydraulic brake for a bicycle includes a reservoir for hydraulic fluid. The reservoir has a variable volume. The control device also includes a reservoir cover at least partially defining the reservoir, and a support that is attachable to a handlebar of the bicycle via an inner annular surface of the support. A handlebar proximity zone is radially outer relative to the inner annular surface of the support and is within two centimeters of the inner annular surface of the support. At least part of the reservoir cover is within the handlebar proximity zone.Type: GrantFiled: December 10, 2021Date of Patent: October 24, 2023Inventors: Charles Dunlap, Brian Jordan, Braden Snead
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Publication number: 20230264771Abstract: A seat post assembly for a bicycle includes a first tube having a first distal end, and a second tube having a second distal end. The first tube is movable relative to the second tube to establish a distance between the first distal end and the second distal end. The distance is at a maximum distance when the first tube is in a first position relative to the second tube. The seat post assembly includes a seal disposed within the second tube and connected to the first tube or the second tube. The seat post assembly includes a piston coupled to the seal when the first tube is in the first position. A position of the seal relative to the second distal end is adjustable, such that the first position of the first tube relative to the second tube is adjustable via the coupling between the piston and the seal.Type: ApplicationFiled: February 14, 2023Publication date: August 24, 2023Applicant: SRAM, LLCInventors: CHARLES DUNLAP, RAFER CHAMBERS
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Publication number: 20230257061Abstract: Front forks for bicycles are described herein. An example front fork includes an upper fork including a first leg and a second leg, a lower fork including a third leg disposed along the first leg and a fourth leg disposed along the second leg, a first set of links rotatably coupled between the first leg and the third leg, and a second set of links rotatably coupled between the second leg and the fourth leg. The first and second sets of links enable the lower fork to swing relative to the upper fork. The front fork also includes a steerer tube coupled to the front fork and a spring in the steerer tube. The spring is configured to bias the lower fork away from the steer tube.Type: ApplicationFiled: April 17, 2023Publication date: August 17, 2023Applicant: SRAM, LLCInventor: CHARLES DUNLAP, III
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Publication number: 20230227120Abstract: Flat mount brake calipers for bicycles are described herein. An example flat mount brake caliper includes a caliper body defining a first piston cylinder and a second piston cylinder. The caliper body has a flat mount surface with a first threaded bore and a second threaded bore extending into the flat mount surface. The first and second threaded bores are configured to receive threaded fasteners to couple the caliper body to a frame of the bicycle. The first and second piston cylinders are arranged such that projections of the first and second threaded bores do not intersect the first or second piston cylinders. The flat mount brake caliper also includes a brake pad and first and second pistons disposed in the respective first and second piston cylinders to move the brake pad relative to the caliper body.Type: ApplicationFiled: January 17, 2022Publication date: July 20, 2023Applicant: SRAM, LLCInventor: CHARLES DUNLAP
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Publication number: 20230192207Abstract: A seat post assembly for a bicycle includes a first tube having a first distal end and a second tube having a second distal end. A distance between the first distal end of the first tube and the second distal end of the second tube is at a maximum when the first tube is in a first position relative to the second tube. The seat post assembly also includes a first chamber and a second chamber that are fluidly coupleable. The first chamber is a positive fluid chamber, and the second chamber is a negative fluid chamber. The seat post assembly includes a fluid volume disposed in the first chamber and the second chamber. The fluid volume includes a compressible fluid. The first chamber is configured to act as a spring configured to bias the first tube towards the first position relative to the second tube.Type: ApplicationFiled: February 15, 2023Publication date: June 22, 2023Applicant: SRAM, LLCInventors: RAFER CHAMBERS, CHARLES DUNLAP
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Publication number: 20230166807Abstract: Brake mounts for bicycles are described herein. The brake mounts are for coupling a brake caliper to a bicycle. An example brake mount includes a bracket having a first side and a second side opposite the first side. The bracket has bores to receive fasteners to couple the brake caliper to the bracket. The brake mount includes a sleeve extending from the first side of the bracket. An opening extends through the sleeve and the bracket. The opening is to receive an axle of a hub assembly of the bicycle. The sleeve is to extend into an axle opening in a frame of the bicycle. A distal end of the sleeve is threaded. The brake mount also includes a nut to be threadably coupled to the distal end of the sleeve when the sleeve is inserted into the axle opening in the frame e.Type: ApplicationFiled: December 1, 2021Publication date: June 1, 2023Applicant: SRAM, LLCInventors: SEBASTIAN HEYNA, HENRIK BRAEDT, CHARLES DUNLAP
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Patent number: 11661129Abstract: A seat post assembly for a bicycle includes a first tube having a first distal end and a second tube having a second distal end. A distance between the first distal end of the first tube and the second distal end of the second tube is at a maximum when the first tube is in a first position relative to the second tube. The seat post assembly also includes a first chamber and a second chamber that are fluidly coupleable. The first chamber is a positive fluid chamber, and the second chamber is a negative fluid chamber. The seat post assembly includes a fluid volume disposed in the first chamber and the second chamber. The fluid volume includes a compressible fluid. The first chamber is configured to act as a spring configured to bias the first tube towards the first position relative to the second tube.Type: GrantFiled: June 30, 2020Date of Patent: May 30, 2023Assignee: SRAM, LLCInventors: Rafer Chambers, Charles Dunlap
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Patent number: 11654998Abstract: Front forks for bicycles are described herein. An example front fork includes an upper fork including a first leg and a second leg, a lower fork including a third leg disposed along the first leg and a fourth leg disposed along the second leg, a first set of links rotatably coupled between the first leg and the third leg, and a second set of links rotatably coupled between the second leg and the fourth leg. The first and second sets of links enable the lower fork to swing relative to the upper fork. The front fork also includes a steerer tube coupled to the front fork and a spring in the steerer tube. The spring is configured to bias the lower fork away from the steer tube.Type: GrantFiled: May 10, 2021Date of Patent: May 23, 2023Assignee: SRAM, LLCInventor: Charles Dunlap, III
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Patent number: 11643164Abstract: Example bicycle disc brake rotors are described herein. An example disc brake rotor described herein includes a core having a brake surface core portion and a single-piece brake track coupled to the brake surface core portion. The brake track is constructed of stainless steel. The brake track includes a first track on a first side of the brake surface core portion, a second track on a second side of the brake surface core portion, and a connecting portion extending over a peripheral edge of the brake surface core portion between the first and second tracks.Type: GrantFiled: June 8, 2020Date of Patent: May 9, 2023Assignee: SRAM, LLCInventors: Charles Dunlap, III, Brian Jordan
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Publication number: 20220411007Abstract: A bicycle suspension system with automatic venting and/or pressurizing of a sealed chamber that minimizes the pressure differential between the sealed chamber and the ambient environment. Methods for making and using the bicycle suspension system are also provided.Type: ApplicationFiled: June 23, 2021Publication date: December 29, 2022Applicant: SRAM, LLCInventors: CHARLES DUNLAP, III, BRENT PACKER, KEVIN WESLING
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Publication number: 20220411008Abstract: Example bicycle suspension components are described herein. An example suspension component includes an air spring including an air spring body and a piston in the air spring body. The piston divides the air spring body into a first chamber and a second chamber. The air spring also includes a shaft extending into the air spring body. The shaft extends through the piston. The piston is slidable along the shaft. The air spring further includes a spring to bias the piston in a first direction relative to the shaft.Type: ApplicationFiled: June 24, 2021Publication date: December 29, 2022Applicant: SRAM, LLCInventors: CHARLES DUNLAP, III, KEVIN WESLING
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Publication number: 20220355894Abstract: Front forks for bicycles are described herein. An example front fork includes an upper fork including a first leg and a second leg, a lower fork including a third leg disposed along the first leg and a fourth leg disposed along the second leg, a first set of links rotatably coupled between the first leg and the third leg, and a second set of links rotatably coupled between the second leg and the fourth leg. The first and second sets of links enable the lower fork to swing relative to the upper fork. The front fork also includes a steerer tube coupled to the front fork and a spring in the steerer tube. The spring is configured to bias the lower fork away from the steer tube.Type: ApplicationFiled: May 10, 2021Publication date: November 10, 2022Applicant: SRAM, LLCInventor: CHARLES DUNLAP, III
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Patent number: 11390354Abstract: Example brake systems and apparatus for providing pitch control on bicycles are described herein. An example rear brake caliper described herein includes a caliper housing to be coupled to the bicycle. The caliper housing includes a first port to be fluidly coupled to a first fluid line fluidly coupled to a front brake actuator and a second port to be fluidly coupled to a second fluid line fluidly coupled to a front brake caliper. The rear brake caliper also includes a valve between the first port and the second port. The valve is operable to affect fluid flow between the first port and the second port.Type: GrantFiled: December 17, 2020Date of Patent: July 19, 2022Assignee: SRAM, LLCInventors: Charles Dunlap, III, Brian Jordan
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Publication number: 20220194513Abstract: Brake calipers and rotors for bicycles are described herein. An example brake caliper includes an outboard caliper portion to be disposed inboard of a frame of the bicycle. The outboard caliper portion includes an outboard caliper body and an outboard brake pad that is fixed relative to the outboard caliper body. The brake caliper also includes an inboard caliper portion coupled to the outboard caliper body. The inboard caliper portion is disposed inboard of the outboard caliper portion when the brake caliper is coupled to the bicycle. The inboard caliper portion includes an inboard caliper body and an inboard brake pad that is movable relative to the inboard caliper body.Type: ApplicationFiled: December 1, 2021Publication date: June 23, 2022Applicant: SRAM, LLCInventors: SEBASTIAN HEYNA, HENRIK BRAEDT, CHARLES DUNLAP
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Publication number: 20220196090Abstract: Brake rotors for bicycles are described herein. An example brake rotor for a bicycle includes a carrier to be coupled to a hub of the bicycle. The brake rotor also includes a brake track having braking surfaces to be engaged by brake pads. The brake track is disposed radially outward of the carrier. The brake track has a first thickness and the carrier has a second thickness greater than the first thickness. The brake track is coupled to the carrier such that the brake track is axially movable relative to the carrier while being radially and circumferentially constrained relative to the carrier.Type: ApplicationFiled: December 17, 2020Publication date: June 23, 2022Applicant: SRAM, LLCInventors: HENRIK BRAEDT, BRIAN JORDAN, CHARLES DUNLAP, SEBASTIAN HEYNA
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Publication number: 20220185425Abstract: A control device for a hydraulic brake for a bicycle includes a reservoir for hydraulic fluid. The reservoir has a variable volume. The control device also includes a reservoir cover at least partially defining the reservoir, and a support that is attachable to a handlebar of the bicycle via an inner annular surface of the support. A handlebar proximity zone is radially outer relative to the inner annular surface of the support and is within two centimeters of the inner annular surface of the support. At least part of the reservoir cover is within the handlebar proximity zone.Type: ApplicationFiled: December 14, 2020Publication date: June 16, 2022Applicant: SRAM, LLCInventors: CHARLES DUNLAP, BRIAN JORDAN, BRADEN SNEAD
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Publication number: 20220185426Abstract: A control device for a hydraulic brake for a bicycle includes a reservoir for hydraulic fluid. The reservoir has a variable volume. The control device also includes a reservoir cover at least partially defining the reservoir, and a support that is attachable to a handlebar of the bicycle via an inner annular surface of the support. A handlebar proximity zone is radially outer relative to the inner annular surface of the support and is within two centimeters of the inner annular surface of the support. At least part of the reservoir cover is within the handlebar proximity zone.Type: ApplicationFiled: December 10, 2021Publication date: June 16, 2022Applicant: SRAM, LLCInventors: CHARLES DUNLAP, BRIAN JORDAN, BRADEN SNEAD