Patents Assigned to Conoco, Inc. (formerly Continental Oil Company)
  • Patent number: 4281547
    Abstract: The integrity of mine roofs and rock bolts is tested by determining the natural frequencies of the roof and bolt. The roof is struck at a plurality of locations and the resulting vibrations sensed with accelerometers. The output of each accelerometer is separated into a plurality of signals of different frequencies by a comb filter having selected band passes. The amplitude of the outputs of each of the band passes of the filter are used to determine the condition of the roof and bolt adjacent each accelerometer. The high amplitude signal resulting from the initial impact of the striking implement is electrically gated from the accelerometer output.
    Type: Grant
    Filed: May 10, 1979
    Date of Patent: August 4, 1981
    Assignee: Conoco, Inc. (formerly Continental Oil Company)
    Inventors: Stanley E. Hinshaw, Charles F. Cole, Jr.