Patents by Inventor Leon N. Ducharme

Leon N. Ducharme 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: 5943855
    Abstract: A chain includes a plurality of link assemblies connected with each other. One of the adjacent link assemblies has a first pair of plates disposed apart in the direction perpendicular to the longitudinal direction of the chain and a pair of hollow cylindrical bushes press-fitted to the first pair of plates. The other of the adjacent link assemblies has a second pair of plates disposed apart in the direction perpendicular to the longitudinal direction of the chain so as to locate at the outside of the first pair of plates and a pin penetrated through the bush and press-fitted to the second pair of plates. A moisture absorption member which retains lubricant oil between the bush and the pin is placed between facing surfaces of the first and second plates. The moisture absorption member has a large deformation amount and a small restoration amount.
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: August 31, 1999
    Assignees: Tsubakimoto Chain Co., U.S. Tsubaki, Inc.
    Inventors: Masaru Morimoto, Leon N. Ducharme
  • Patent number: 5382199
    Abstract: The present invention provides a roller chain for pin oven application, having an increased pin and bushing diameters for larger bearing areas. Decreased bushing and roller thicknesses provide increased bearing areas for prolonging chain life.
    Type: Grant
    Filed: February 3, 1992
    Date of Patent: January 17, 1995
    Assignee: U.S. Tsubaki, Inc.
    Inventor: Leon N. Ducharme