Patents by Inventor Gilbert Jeanjean

Gilbert Jeanjean 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).

  • Hydraulic device for back and forth movement of a machine part, and a clamping unit of an injection molding machine fitted with such a hydraulic device
    Patent number: 7371064
    Abstract: The invention relates to a hydraulic device for the back and forth movement and locking of a machine part, in particular for the opening, closing and locking of an injection molding tool. The hydraulic device comprises a cylinder (1), in which a first pressure space (6) is provided, a primary piston (2) with one or several piston rods (11) which may float in a pressure medium within the first pressure space (6) and furthermore an secondary piston (7) which may be axially displaced within the cylinder (1). The invention is characterized in that the auxiliary piston (7) comprises recesses (12), into which the piston rods (11) of the primary piston (2) can be moved and the opposing sides of the primary piston (2) and secondary piston (7) have surfaces (40, 41) which may be brought into contact. In a first movement phase (opening and closing) only the primary piston (2) is moved.
    Type: Grant
    Filed: April 4, 2003
    Date of Patent: May 13, 2008
    Assignee: Billion S.A.
    Inventors: Gilbert Jeanjean, Jean-François Guyon
  • Hydraulic device for back and forth displacement of a machine piece and a closing unit on an injection moulding machine fitted with such a hydraulic device
    Publication number: 20050129805
    Abstract: The invention relates to a hydraulic device for the back and forth movement and locking of a machine part, in particular for the opening, closing and locking of an injection molding tool. The hydraulic device comprises a cylinder (1), in which a first pressure space (6) is provided, a primary piston (2) with one or several piston rods (11) which may float in a pressure medium within the first pressure space (6) and furthermore an secondary piston (7) which may be axially displaced within the cylinder (1). The invention is characterized in that the auxiliary piston (7) comprises recesses (12), into which the piston rods (11) of the primary piston (2) can be moved and the opposing sides of the primary piston (2) and secondary piston (7) have surfaces (40, 41) which may be brought into contact. In a first movement phase (opening and closing) only the primary piston (2) is moved.
    Type: Application
    Filed: April 4, 2003
    Publication date: June 16, 2005
    Applicant: BILLION S.A.
    Inventors: Gilbert Jeanjean, Jean-Francois Guyon