Patents by Inventor Dorice Vrignaud

Dorice Vrignaud 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).

  • Press tool comprising interchangeable working parts
    Patent number: 4718161
    Abstract: A press tool having working parts constituted by stamps and dies and attachment parts such as blank-holders, punch-holders, die-holders, and stay blocks of the tool, wherein interchangeable stamps and dies, formed from metallic removable disc like elements are held by detachable die or stamp-holders, and cradles. The cradles are intended to receive and maintain in place the die or stamp-holder, and are provided with at least one recess presenting a form complementary to that of the holders for each of the die or stamp-holders, an adjustable clamp system is provided which cooperates with an associated cradle in order to render the holder radially and axially immovable.
    Type: Grant
    Filed: April 30, 1986
    Date of Patent: January 12, 1988
    Assignee: Essweing S.A.
    Inventors: Jean M. Pfister, Dorice Vrignaud
  • Press tool provided with a system for guiding and relieving a metal strip
    Patent number: 4704890
    Abstract: A press tool is provided with a system for guiding and relieving a metal strip which is caused to pass through the tool. During the successive manufacture of several pieces having different predetermined dimensions and forms. The system for guiding and relieving a metal strip, which is provided with adjustable sliding and interchangeable elements for controlling the position of the metal strip within the press tool, is adapted to be adjusted to be used for certain preselected widths of metal strips and for different degrees of brittleness of the metal strips used, as well as for different pieces to be manufactured having a predetermined bulk of the upper parts and for various mechanical operations performed by the tool.
    Type: Grant
    Filed: April 9, 1986
    Date of Patent: November 10, 1987
    Assignee: Esswein, S.A.
    Inventor: Dorice Vrignaud
  • Metal stamping tool with working parts removable while on the machine
    Patent number: 4656902
    Abstract: A stamping machine tool having working parts in the form of one or several matrices and one or several stamps, and a blank-holder guiding the stamp(s) in its(their) displacements and securing in position against this or these matrices during the working stroke, a sheet metal piece subjected to a form shaping operation and wherein there is provided between the matrices and the stamp(s) a blank-holder that performs at least one normal working stroke and two withdrawal strokes, at will, namely a normal withdrawal stroke and an intervention withdrawal stroke which allow a dismantling of the working parts of the tool while on the machine.
    Type: Grant
    Filed: November 4, 1985
    Date of Patent: April 14, 1987
    Assignee: Esswein S.A.
    Inventor: Dorice Vrignaud