Patents by Inventor Marcel P. D'Haem

Marcel P. D'Haem 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).

  • Ratchet mechanism
    Patent number: 4791836
    Abstract: An improved ratchet wrench tool ratcheting mechanism is provided wherein springs encased in the shank spindle have balls at each end of the springs to abut fixed washer surfaces so that tool operation and life is improved by increasing the frictional force and reducing the spring stress, unbalanced load, and housing yoke wear experienced by prior art mechanisms.
    Type: Grant
    Filed: April 1, 1987
    Date of Patent: December 20, 1988
    Assignee: Chicago Pneumatic Tool Company
    Inventors: Marcel P. D'Haem, Pradip K. Paul
  • Locomotive speed recorder system
    Patent number: 4061039
    Abstract: A locomotive speed recorder system having a gear train drive operable off the drive wheel of a locomotive, in which system a pneumatically operable cam bar is provided for disengaging the gear train drive so as to de-activate the recorder during dead-head engine runs. A changeable gear train is utilized to effect drive wheel wear compensation; and a right angle drive from the drive wheel incorporates reduction gearing to reduce wear of a flexible cable connecting the right angle drive with the recorder.
    Type: Grant
    Filed: April 8, 1976
    Date of Patent: December 6, 1977
    Assignee: Chicago Pneumatic Tool Company
    Inventors: Livio F. Marcantonio, Marcel P. D'Haem
  • Vibration isolating hand grip for shank of a percussive chisel
    Patent number: 4044625
    Abstract: A hand grip in the form of a sleeve unit having a body of elastomeric material provided with an internal cavity filled with a fluent material; and having an axial through hole adapted to slidably receive the shank of a chisel of a percussive tool, the hand grip adapted when manually squeezed to grip the shank of the chisel to allow insertion or removal of the shank from the tool, and adapted when grasped by the operator during operation of the tool to isolate the vibrations of the shank from the hand of the operator.
    Type: Grant
    Filed: July 1, 1976
    Date of Patent: August 30, 1977
    Assignee: Chicago Pneumatic Tool Company
    Inventors: Marcel P. D'Haem, Wallis C. Axt
  • Tool retainer for a hand held power tool
    Patent number: D250874
    Type: Grant
    Filed: September 28, 1976
    Date of Patent: January 23, 1979
    Assignee: Chicago Pneumatic Tool Company
    Inventor: Marcel P. D'Haem