Patents by Inventor David R. Leeper

David R. Leeper 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: 6792815
    Abstract: A ring load cell configured to measure force, moment, and temperature components in an orthogonal three-axis coordinate system. The ring-load-cell structure consists of two annular flanges having a common central axis through which a shaft may be disposed. The annular flanges are interconnected by a plurality of filleted posts configured to enhance strain distribution and which are disposed parallel to the common central axis, equally spaced about the circumference of the annular flanges. A plurality of strain gauges is disposed either on the posts or on fillets, and a plurality of temperature sensors is disposed either on the posts or on the inner surfaces of the annular flanges. Signals from the strain gauges and temperature sensors are processed to provide thermally compensated strain measurements of the applied forces and moments on the ring-load-cell structure in the orthogonal three-axis coordinate system.
    Type: Grant
    Filed: May 8, 2002
    Date of Patent: September 21, 2004
    Assignee: The Timken Company
    Inventors: Graham F. McDearmon, David R. Leeper, David H. Walter, Doug H. Smith
  • Publication number: 20030209085
    Abstract: A ring load cell configured to measure force, moment, and temperature components in an orthogonal three-axis coordinate system. The ring-load-cell structure consists of two annular flanges having a common central axis through which a shaft may be disposed. The annular flanges are interconnected by a plurality of filleted posts configured to enhance strain distribution and which are disposed parallel to the common central axis, equally spaced about the circumference of the annular flanges. A plurality of strain gauges is disposed either on the posts or on fillets, and a plurality of temperature sensors is disposed either on the posts or on the inner surfaces of the annular flanges. Signals from the strain gauges and temperature sensors are processed to provide thermally compensated strain measurements of the applied forces and moments on the ring-load-cell structure in the orthogonal three-axis coordinate system.
    Type: Application
    Filed: May 8, 2002
    Publication date: November 13, 2003
    Applicant: The Timken Company
    Inventors: Graham F. McDearmon, David R. Leeper, David H. Walter, Doug H. Smith
  • Patent number: 6535135
    Abstract: A tapered roller bearing having its rollers arranged in two rows within an outer race and around an inner race contains a sensing device that radiates signals which reflect conditions within the bearing. In one embodiment, the outer race is unitary and the sensing device is wireless and self-powered and includes a mounting ring that is fitted to the outer race between the raceways along which the rollers roll. The ring has embedded within it several sensors for monitoring bearing conditions such as temperature and vibrations. The ring also contains a radio transmitter, a microprocessor to which the sensors are connected, and a power supply for producing the electrical energy required to operate the processor and the transmitter. The electric power is generated by means of electromechanical energy conversion using permanent magnets, armature winding and a target wheel that is captured between and rotates with the two cones.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: March 18, 2003
    Assignee: The Timken Company
    Inventors: Michael L. French, Khan M. Iftekharuddin, David R. Leeper, Ram P. Samy, Wen-Ruey Hwang
  • Patent number: 5648611
    Abstract: The depth of a case on a specimen of case-carburized steel is measured by launching an acoustic wave along the surface of the specimen such that the wave passes through the case, and measuring the velocity of that wave within the specimen. From an existing correlation of velocity and case depth for the very same core steel as the specimen, one finds the case depth which corresponds to the measured velocity, and that is the case depth of the specimen.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: July 15, 1997
    Assignee: The Timken Company
    Inventors: Surrendra Singh, Rosendo Fuquen, David R. Leeper