Patents by Inventor Erik Kalf

Erik Kalf 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: 10258522
    Abstract: The present disclosure relates to a seat arrangement (1) for an electrically powered wheelchair, wherein the seat arrangement comprises (1): a mounting arrangement for mounting the seat arrangement (1) to a chassis of an electrically powered wheelchair, a seat frame (3), a backrest frame (5), a backrest actuator (7), wherein the backrest frame (5) is pivotally coupled to the seat frame (3), forming a first pivot axis (A1), and wherein the backrest frame (5) is pivotally coupled to the backrest actuator (7), forming a translatable second pivot axis (A2), a retaining mechanism (11) arranged to retain the backrest frame (5) in an upright position while the backrest frame (5) is subjected to a forward-tilting force smaller than a threshold value, wherein the retaining mechanism (11) is arranged to allow movement of the backrest frame (5) to a forward-tilted position when the backrest frame (5) is subjected to a forward-tilting force equal to or greater than the threshold value, and a locking mechanism (13) arrang
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: April 16, 2019
    Assignee: PERMOBIL AB
    Inventors: Erik Kalf, Anders Edholm
  • Patent number: 10201464
    Abstract: The present disclosure relates to a chassis arrangement (1) for an electrically powered wheelchair (35). The chassis arrangement (1) comprises a main chassis member (3) having a first side panel (3a) defining a first side of the main chassis member (3), and a second side panel (3b) defining a second side of the main chassis member (3), the second side being opposite to the first side, wherein each of the first side panel (3a) and the second side panel (3b) has spring attachment arrangements (3g, 3h) for attachment of spring assemblies (9a, 9b, 11a, 11b), wherein each of the first side panel (3a) and the second side panel (3b) has pivot arm attachment arrangements (3e, 3f) for attachment of pivot arms (5a, 5b, 7a, 7b), wherein the main chassis member (3) has a torsional stiffness greater than 1200 Nm/degree. An electrically powered wheelchair comprising a chassis arrangement (1) is also presented herein.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: February 12, 2019
    Assignee: PERMOBIL AB
    Inventors: Erik Kalf, Pär Torgersson, Herbert Van de Wal
  • Patent number: 10092465
    Abstract: The present disclosure relates to a caster wheel assembly (1) for a wheelchair, comprising: a caster housing (3), a central body (9) having a radially outwards extending flange (9a), which central body (9) is configured to be received by the caster housing (3), a spindle shaft (23) configured to be rotationally locked relative to the central body (9), a first bearing (11) having an inner bearing race (11b) configured to be rotationally locked relative to the spindle shaft (23), a friction member (13; 11a) configured to be rotationally locked relative to the caster housing (3), and a resilient member (15) configured to be arranged between the flange (9a) and the friction member (13), and configured to provide a force between the flange (9a) and the friction member (13) to thereby create friction torque between the caster housing (3) and the spindle shaft (23).
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: October 9, 2018
    Assignee: PERMOBIL AB
    Inventors: Herbert Van de Wal, Erik Kalf, Urban Lind, Benny Tenggren
  • Patent number: 10058466
    Abstract: The present disclosure relates to a chassis arrangement (1) for an electrically powered wheelchair (35). The chassis arrangement (1) comprises a main chassis member (3) having a first side panel (3a) defining a first side of the main chassis member (3), and a second side panel (3b) defining a second side of the main chassis member (3), the second side being opposite to the first side, wherein each of the first side panel (3a) and the second side panel (3b) has spring attachment arrangements (3g, 3h) for attachment of spring assemblies (9a, 9b, 11a, 11b), wherein each of the first side panel (3a) and the second side panel (3b) has pivot arm attachment arrangements (3e, 3f) for attachment of pivot arms (5a, 5b, 7a, 7b), wherein the main chassis member (3) has a torsional stiffness greater than 1200 Nm/degree. An electrically powered wheelchair comprising a chassis arrangement (1) is also presented herein.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: August 28, 2018
    Assignee: PERMOBIL AB
    Inventors: Erik Kalf, Pär Torgersson, Herbert Van de Wal
  • Publication number: 20170360633
    Abstract: The present disclosure relates to a seat arrangement (1) for an electrically powered wheelchair, wherein the seat arrangement comprises (1): a mounting arrangement for mounting the seat arrangement (1) to a chassis of an electrically powered wheelchair, a seat frame (3), a backrest frame (5), a backrest actuator (7), wherein the backrest frame (5) is pivotally coupled to the seat frame (3), forming a first pivot axis (A1), and wherein the backrest frame (5) is pivotally coupled to the backrest actuator (7), forming a translatable second pivot axis (A2), a retaining mechanism (11) arranged to retain the backrest frame (5) in an upright position while the backrest frame (5) is subjected to a forward-tilting force smaller than a threshold value, wherein the retaining mechanism (11) is arranged to allow movement of the backrest frame (5) to a forward-tilted position when the backrest frame (5) is subjected to a forward-tilting force equal to or greater than the threshold value, and a locking mechanism (13) arrang
    Type: Application
    Filed: December 17, 2015
    Publication date: December 21, 2017
    Inventors: Erik Kalf, Anders Edholm
  • Publication number: 20170340494
    Abstract: The present disclosure relates to a caster wheel assembly (1) for a wheelchair, comprising: a caster housing (3), a central body (9) having a radially outwards extending flange (9a), which central body (9) is configured to be received by the caster housing (3), a spindle shaft (23) configured to be rotationally locked relative to the central body (9), a first bearing (11) having an inner bearing race (11b) configured to be rotationally locked relative to the spindle shaft (23), a friction member (13; 11a) configured to be rotationally locked relative to the caster housing (3), and a resilient member (15) configured to be arranged between the flange (9a) and the friction member (13), and configured to provide a force between the flange (9a) and the friction member (13) to thereby create friction torque between the caster housing (3) and the spindle shaft (23).
    Type: Application
    Filed: May 22, 2017
    Publication date: November 30, 2017
    Inventors: Herbert Van de Wal, Erik Kalf, Urban Lind, Benny Tenggren
  • Publication number: 20170296409
    Abstract: The present disclosure relates to a chassis arrangement (1) for an electrically powered wheelchair (35). The chassis arrangement (1) comprises a main chassis member (3) having a first side panel (3a) defining a first side of the main chassis member (3), and a second side panel (3b) defining a second side of the main chassis member (3), the second side being opposite to the first side, wherein each of the first side panel (3a) and the second side panel (3b) has spring attachment arrangements (3g, 3h) for attachment of spring assemblies (9a, 9b, 11a, 11b), wherein each of the first side panel (3a) and the second side panel (3b) has pivot arm attachment arrangements (3e, 3f) for attachment of pivot arms (5a, 5b, 7a, 7b), wherein the main chassis member (3) has a torsional stiffness greater than 1200 Nm/degree. An electrically powered wheelchair comprising a chassis arrangement (1) is also presented herein.
    Type: Application
    Filed: September 16, 2015
    Publication date: October 19, 2017
    Applicant: PERMOBIL AB
    Inventors: Erik Kalf, Pär Torgersson, Herbert Van de Wal
  • Publication number: 20170281436
    Abstract: The present disclosure relates to a chassis arrangement (1) for an electrically powered wheelchair (35). The chassis arrangement (1) comprises a main chassis member (3) having a first side panel (3a) defining a first side of the main chassis member (3), and a second side panel (3b) defining a second side of the main chassis member (3), the second side being opposite to the first side, wherein each of the first side panel (3a) and the second side panel (3b) has spring attachment arrangements (3g, 3h) for attachment of spring assemblies (9a, 9b, 11a, 11b), wherein each of the first side panel (3a) and the second side panel (3b) has pivot arm attachment arrangements (3e, 3f) for attachment of pivot arms (5a, 5b, 7a, 7b), wherein the main chassis member (3) has a torsional stiffness greater than 1200 Nm/degree. An electrically powered wheelchair comprising a chassis arrangement (1) is also presented herein.
    Type: Application
    Filed: September 16, 2015
    Publication date: October 5, 2017
    Inventors: Erik Kalf, Pär Torgersson, Herbert Van de Wal