Patents by Inventor Herbert J. Hoekstra

Herbert J. Hoekstra 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).

  • Length and width adjustable wheelchair
    Patent number: 4989890
    Abstract: Wheelchair side frames (A) include forward and rearward side frame portions (10, 12) which are telescopically interconnected such that the length of the side frames is selectively adjustable. A cross brace folding assembly (B) interconnects the side frames and selectively moves the side frames between folded and open configurations. The cross brace mechanism includes a pair of cross brace members (30, 32) which are pivotally interconnected (34) and which are each adjustable in length to adjust the width of the wheelchair in the open configuration without adjusting the height of the seat (100). A pair of rear seat support members (114) are telescopically mounted on posts (112) of the rear frame and are interconnected with stand-off members (120) for supporting a seat back portion (110). The stand-off members hold the seat back away from the rear seat support members such that the clamps from orthopedic braces and appliances may be freely mounted therealong.
    Type: Grant
    Filed: December 14, 1988
    Date of Patent: February 5, 1991
    Assignee: Invacare Corporation
    Inventors: Walter G. Lockard, Herbert J. Hoekstra, Allen J. Boris, Douglas M. Nickles
  • Adjustable child's wheelchair
    Patent number: 4813693
    Abstract: Wheelchair side frames (A) include forward and rearward side frame fortions (10, 12) which are telescopically interconnected such that the length of the side frames is selectively adjustable. A cross brace folding assembly (B) interconnects the side frames and selectively moves the side frames between folded and open configurations. The cross brace mechanism includes a pair of cross brace members (30, 32) which are pivotally interconnected (34) and which are each adjustable in length to adjust the width of the wheelchair in the open configuration without adjusting the height of the seat (100). A pair of rear seat support members (114) are telescopically mounted on posts (112) of the rear frame and are interconnected with stand-off members (120) for supporting a seat back portion (110). The stand-off members hold the seat back away from the rear seat support members such that the clamps from orthopedic braces and appliances may be freely mounted therealong.
    Type: Grant
    Filed: November 5, 1986
    Date of Patent: March 21, 1989
    Assignee: Invacare Corporation
    Inventors: Walter G. Lockard, Herbert J. Hoekstra, Allen J. Boris, Douglas M. Nickles