Patents by Inventor Nigel S. Campbell

Nigel S. Campbell 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: 5295918
    Abstract: A rotary arm sewage treatment bed has its rotary arms driven by an electrical drive system. The drive system comprises a driving ring (7) to which the arms are secured. The drive ring is driven by a friction belt (8), from a drive wheel (10). The drive wheel (10) is mounted on a pivoted carriage (18). A compressor (30) operates a piston/cylinder (36)/(34). In normal use, the piston (36) acts on the carriage (18) to cause tensioning of the belt (8), and thus enable drive. In the event of a supply failure, the piston is retracted by a return spring and the drive is disengaged, the carriage being pivoted such that the drive wheel is no longer in a position to tension the belt (8). The arms are then free to rotate under the reaction force of the sewage emitted, until the power supply is restored.
    Type: Grant
    Filed: August 10, 1992
    Date of Patent: March 22, 1994
    Assignee: Drive Systems Limited
    Inventors: Nigel S. Campbell, David Lavender