Patents by Inventor Gregory C. Merrifield

Gregory C. Merrifield 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: 10298229
    Abstract: A switch adapter can include a base having one or more openings, a support coupled to the base, and one or more retainers for coupling a switch to the adapter. The support can have one or more openings between its interior and exterior. The retainer can be adapted to couple to at least one of the base, the support, and a combination thereof. The switch adapter can include one or more switches, such as a replacement switch, and can be adapted for replacing a limit switch with a proximity switch. A proximity switch can be coupled to a switch adapter in one or more positions, and a switch adapter can be adapted to couple with a plurality of different switch mounts. A switch adapter can include a mass compensator for adjusting its center of gravity.
    Type: Grant
    Filed: January 5, 2017
    Date of Patent: May 21, 2019
    Assignee: General Equipment and Manufacturing Company, Inc.
    Inventors: Robert L. LaFountain, Gregory C. Merrifield, Michael Simmons
  • Patent number: 10020147
    Abstract: Proximity switches include a hermetically sealed unit that can be used in harsh environments and under significant pressures, such as underwater and in nuclear power facilities, without having any parts that would require replacement or periodic maintenance. The proximity switches are preferably switches actuated by physical movement of a contact in response to changing magnetic forces. The switches are preferably disposed in a body tube optionally including a hermetic seal assembly to seal an open end of the body tube and/or a ferrule that prevents electrical wires attached to the switch inside the body tube from being pulled away from the switch. Further, the switches preferably maintain a contact pressure between electrical contacts sufficient to withstand acceleration seismic testing of 10 g with no contact discontinuity.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: July 10, 2018
    Assignee: General Equipment and Manufacturing Company, Inc.
    Inventors: Robert L. LaFountain, Gregory C. Merrifield
  • Publication number: 20180191345
    Abstract: A switch adapter can include a base having one or more openings, a support coupled to the base, and one or more retainers for coupling a switch to the adapter. The support can have one or more openings between its interior and exterior. The retainer can be adapted to couple to at least one of the base, the support, and a combination thereof. The switch adapter can include one or more switches, such as a replacement switch, and can be adapted for replacing a limit switch with a proximity switch. A proximity switch can be coupled to a switch adapter in one or more positions, and a switch adapter can be adapted to couple with a plurality of different switch mounts. A switch adapter can include a mass compensator for adjusting its center of gravity.
    Type: Application
    Filed: January 5, 2017
    Publication date: July 5, 2018
    Inventors: Robert L. LaFountain, Gregory C. Merrifield, Michael Simmons
  • Publication number: 20160365208
    Abstract: Proximity switches include a hermetically sealed unit that can be used in harsh environments and under significant pressures, such as underwater and in nuclear power facilities, without having any parts that would require replacement or periodic maintenance. The proximity switches are preferably switches actuated by physical movement of a contact in response to changing magnetic forces. The switches are preferably disposed in a body tube optionally including a hermetic seal assembly to seal an open end of the body tube and/or a ferrule that prevents electrical wires attached to the switch inside the body tube from being pulled away from the switch. Further, the switches preferably maintain a contact pressure between electrical contacts sufficient to withstand acceleration seismic testing of 10 g with no contact discontinuity.
    Type: Application
    Filed: June 13, 2016
    Publication date: December 15, 2016
    Inventors: Robert L. LaFountain, Gregory C. Merrifield
  • Patent number: 8593241
    Abstract: An enclosed proximity switch assembly includes a top enclosure and a bottom enclosure that are coupled to form an interior volume. A shaft protrusion upwardly extends from a top surface of the top enclosure, and an interior bore portion having an enclosed volume is defined within the shaft protrusion to form a portion of the interior volume. A first end of a vertical shaft is rotatably disposed within the interior bore portion such that the shaft rotates relative to the top and bottom enclosures. A samarium cobalt target magnet is coupled to the shaft, and the target magnet interacts with a samarium cobalt driver magnet within a proximity switch when the target magnet is rotated within a predetermined distance of a top portion of the proximity switch. The interaction causes a switch to move from a first state to a second state, or vice versa.
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: November 26, 2013
    Assignee: General Equipment and Manufacturing Company, Inc.
    Inventors: Gregory C. Merrifield, Robert L. LaFountain, Brian P. Pate, Michael J. Simmons
  • Publication number: 20130021123
    Abstract: An enclosed proximity switch assembly includes a top enclosure and a bottom enclosure that are coupled to form an interior volume. A shaft protrusion upwardly extends from a top surface of the top enclosure, and an interior bore portion having an enclosed volume is defined within the shaft protrusion to form a portion of the interior volume. A first end of a vertical shaft is rotatably disposed within the interior bore portion such that the shaft rotates relative to the top and bottom enclosures. A samarium cobalt target magnet is coupled to the shaft, and the target magnet interacts with a samarium cobalt driver magnet within a proximity switch when the target magnet is rotated within a predetermined distance of a top portion of the proximity switch. The interaction causes a switch to move from a first state to a second state, or vice versa.
    Type: Application
    Filed: April 25, 2012
    Publication date: January 24, 2013
    Applicant: General Equipment and Manufacturing Company, Inc. d/b/a TopWorx, Inc.
    Inventors: Gregory C. Merrifield, Robert L. LaFountain, Brian P. Pate, Michael J. Simmons