Patents by Inventor Robert W. MacDonnell

Robert W. MacDonnell 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).

  • Railway bolster lug
    Patent number: 4135833
    Abstract: Bolster re-enforcement systems, applicable both to new and existing bolster designs, provide for pre-stressing the bottom bolster center plate region utilizing lugs transmitting tension forces in opposition to the stress pattern applied to the center region of the bolster as the result of vertical loading associated with normal operating conditions.
    Type: Grant
    Filed: December 4, 1975
    Date of Patent: January 23, 1979
    Assignee: R. W. Mac Company
    Inventors: Robert W. MacDonnell, Otto A. Shander
  • Replaceable bolster gib arrangement
    Patent number: 4092932
    Abstract: A replaceable bolster gib comprises a U-shaped holder block fixed to the bolster, a trough-shaped wear shoe block having a pocket complementary to the holder block and mounted in embracing force transmitting relation thereon, and an interlocking means such as a spring steel cotter pin drive in force fit relation through the holder and overlapping portions of the wear shoe to removably retain the blocks.
    Type: Grant
    Filed: July 26, 1976
    Date of Patent: June 6, 1978
    Assignee: R. W. Mac Company
    Inventor: Robert W. MacDonnell
  • Constant contact side bearing
    Patent number: 3981548
    Abstract: Constant contact side bearings include a base presenting supports for cushions that are engaged by a top follower. In its pre-load position, rollers disposed on the top follower are urged into constant contact with a car body to control truck hunting. The cushions accommodate additional travel of the top follower to provide substantially higher load resistance for control of lateral car body roll resistance.
    Type: Grant
    Filed: May 27, 1975
    Date of Patent: September 21, 1976
    Assignee: R. W. Mac Company
    Inventors: Robert W. MacDonnell, Otto A. Shander
  • AB-type piston assembly shipping cover
    Patent number: 3946873
    Abstract: A dual purpose shipping cover serving, in conjunction with locking means, as a cover for a conventional air brake cylinder containing an AB type railroad air brake piston assembly and serving in a matched pair, in conjunction with said locking means as a composite container for the AB piston. The cover has a stepped cylindrical contour to conform to both the piston end and the head end of the piston assembly.
    Type: Grant
    Filed: July 5, 1974
    Date of Patent: March 30, 1976
    Assignee: Unity Railway Supply Co., Inc.
    Inventor: Robert W. MacDonnell