Patents by Inventor Robert W. Sehmer

Robert W. Sehmer 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: 5358135
    Abstract: An enclosure for electrical or electronic devices having components requiring periodic adjustment is provided with an access opening to the adjustments for the components including a hinged, attachable door for closing and sealing the access opening.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: October 25, 1994
    Assignee: Square D Company
    Inventors: T. Ray Robbins, Paul D. Johnson, Robert W. Sehmer
  • Patent number: 5241290
    Abstract: The low dissipation compact circuit breaker of the present invention selectively conducts breaker current in a circuit to be protected. The compact circuit breaker is in an enclosure surrounding at least a stationary contact and a moveable contact. This moving contact selectively assumes one of two bistable states, a contiguous closed state or a noncontiguous open state. A rotary operator including rotary members and a contact lever train selectively causes the stationary contact and the moveable contact to assume either a closed or an open state. A single solenoid for sensing breaker current in each phase causes the rotary operator to move the contacts from a closed state to an open state. Additionally, the solenoid for a faulted phase directly acts on a solenoid bell crank to cause the contact to begin to assume an open state in a trip operation, if breaker current reaches a preselected trip value in the faulted phase.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: August 31, 1993
    Assignee: Square D Company
    Inventors: Robert W. Sehmer, James T. Tucker
  • Patent number: 4774484
    Abstract: An apparatus is disclosed for mounting an auxiliary contact external to an electromagnetically operated electrical contactor so that the auxiliary contact may be operated by a carrier of the contactor. The apparatus comprises: a wall of the auxiliary contact; at least one rib projecting from the wall of the auxiliary contact, the at least one rib arranged to be matingly inserted into at least one slot in an external side of the contactor so that the rib attaches the auxiliary contact to the contactor; and, a flexible lever formed from a portion of the wall, and the lever locks into a mating structure when the rib attaches the auxiliary contact to the contactor in order to lock the auxiliary contact in position on the external side of the contactor.
    Type: Grant
    Filed: February 5, 1987
    Date of Patent: September 27, 1988
    Assignee: Square D Company
    Inventors: Lewis M. Lehman, Robert W. Sehmer
  • Patent number: 4535310
    Abstract: A timing attachment for a relay that is programmable to provide an ON Delay or an OFF Delay operation of a pair of switches having either normally open or normally closed contacts. The attachment includes a housing that is mountable in either of two positions on an assembly that is attached to the relay to program the OFF and ON Delay timing functions and indicia on the switches that indicate the contact operation of the switches when the switches are inserted in sockets in the attachment. A cover for the attachments has openings there through that expose indicia on the switches indicating the normally open and normally closed operating condition of the switches when the switches are inserted into the sockets and a slider that is movable along a rear surface of the cover to positions indicating the programmed operation of the attachment and the mode of operation of the switches when the attachment is mounted on the relay.
    Type: Grant
    Filed: September 2, 1983
    Date of Patent: August 13, 1985
    Assignee: Square D Company
    Inventors: Allin W. Schubring, Robert W. Sehmer