Patents by Inventor Jack Skrydstrup

Jack Skrydstrup 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).

  • Patent number: 11827321
    Abstract: The present invention discloses a folding propeller (1) for a boat, e.g. for a sailboat or a multihull yacht, where said folding propeller (1) comprises a hub (2) for directly or indirectly fastening at a driveshaft connected to a motor, where said folding propeller (1) further comprises at least three individual blades (3), where each of said blades (3) comprises a blade root (4) arranged to pivot around a separate pivot pin (9), at said hub (2) in order to be either in a first and operative position, where the blade (3) is pointing mainly in a radial direction, or in a second and inoperative position, where the blade (3) is pointing mainly in an axial direction, where said pivot pin (9) comprises a first and second end (20, 21), where said hub (2) comprises a cut out (19) for each of said blade roots (4), and further comprises a set of holes (10) for installing said pivot pins (9).
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: November 28, 2023
    Assignee: FLEXOFOLD APS
    Inventor: Jack Skrydstrup
  • Publication number: 20210206462
    Abstract: The present invention discloses a folding propeller (1) for a boat, e.g. for a sailboat or a multihull yacht, where said folding propeller (1) comprises a hub (2) for directly or indirectly fastening at a driveshaft connected to a motor, where said folding propeller (1) further comprises at least three individual blades (3), where each of said blades (3) comprises a blade root (4) arranged to pivot around a separate pivot pin (9), at said hub (2) in order to be either in a first and operative position, where the blade (3) is pointing mainly in a radial direction, or in a second and inoperative position, where the blade (3) is pointing mainly in an axial direction, where said pivot pin (9) comprises a first and second end (20, 21), where said hub (2) comprises a cut out (19) for each of said blade roots (4), and further comprises a set of holes (10) for installing said pivot pins (9).
    Type: Application
    Filed: September 7, 2016
    Publication date: July 8, 2021
    Inventor: Jack Skrydstrup
  • Patent number: 10793243
    Abstract: The present invention relates to a foldable propeller (1) for a boat, e.g. for a sailboat or a multihull yacht, where the foldable propeller (1) comprises a hub (2) with a plurality of blades, each blade comprising a blade root arranged to pivot around a separate pivot pin in order to be either in a first operative orientation, where the blade (4) is pointing mainly in a radial direction, or in a second inoperative orientation, where the blade is pointing mainly in an axial direction. The hub (2) comprises a number of hub flanges (28) for holding the pivot pins (9). The pivot pin (9) comprises at its second end (21) a head (26) with a recess (24) that accommodates the first end (20) of another of the pivot pins (9) inside the head (26).
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: October 6, 2020
    Assignee: Flexofold ApS
    Inventors: Jack Skrydstrup, Ulrik Nielsen
  • Publication number: 20190135395
    Abstract: The present invention relates to a foldable propeller (1) for a boat, e.g. for a sailboat or a multihull yacht, where the foldable propeller (1) comprises a hub (2) with a plurality of blades, each blade comprising a blade root arranged to pivot around a separate pivot pin in order to be either in a first operative orientation, where the blade (4) is pointing mainly in a radial direction, or in a second inoperative orientation, where the blade is pointing mainly in an axial direction. The hub (2) comprises a number of hub flanges (28) for holding the pivot pins (9). The pivot pin (9) comprises at its second end (21) a head (26) with a recess (24) that accommodates the first end (20) of another of the pivot pins (9) inside the head (26).
    Type: Application
    Filed: June 19, 2018
    Publication date: May 9, 2019
    Inventors: Jack Skrydstrup, Ulrik Nielsen
  • Patent number: 10214269
    Abstract: A folding propeller for a boat, e.g., for a sailboat or a multihull yacht, and a method for installing and/or adjusting such a folding propeller, where said folding propeller has a hub for directly or indirectly fastening at a driveshaft connected to a motor, where said folding propeller further has at least two individual blades, where each of said blades has a root arranged to pivot around a pivot pin at said hub to be either in a first, operative position, where the blades are pointing mainly in a radial direction, and in a second, inoperative position, where the blades are pointing mainly in an axial direction, where said hub has one or more cut outs for said blades roots and further has a first set of holes for installing said pivot pins and a second set of holes for installing a locking device for engagement with said pivot pins.
    Type: Grant
    Filed: October 14, 2014
    Date of Patent: February 26, 2019
    Assignee: FLEXOFOLD APS
    Inventor: Jack Skrydstrup
  • Publication number: 20160272292
    Abstract: A folding propeller for a boat, e.g., for a sailboat or a multihull yacht, and a method for installing and/or adjusting such a folding propeller, where said folding propeller has a hub for directly or indirectly fastening at a driveshaft connected to a motor, where said folding propeller further has at least two individual blades, where each of said blades has a root arranged to pivot around a pivot pin at said hub to be either in a first, operative position, where the blades are pointing mainly in a radial direction, and in a second, inoperative position, where the blades are pointing mainly in an axial direction, where said hub has one or more cut outs for said blades roots and further has a first set of holes for installing said pivot pins and a second set of holes for installing a locking device for engagement with said pivot pins.
    Type: Application
    Filed: October 14, 2014
    Publication date: September 22, 2016
    Applicant: Flexofold ApS
    Inventor: Jack Skrydstrup