Patents Assigned to McGraw-Edison
  • Patent number: 4473197
    Abstract: A cable reel apparatus includes a rotatably mounted cable spool in a fixed support. A locking pin is provided on the support and is engageable with the spool to hold the spool and cable hook-up in a fixed position. A gear unit connected to the support includes a spool gear rotatably mounted on a spool shaft and a spring gear coupled to a spring motor. Friction drive discs are located to the opposite sides of the spol gear and coupling discs abut the drive discs. The coupling discs are connected to the spool shaft. "Belleville" disc springs are mounted in abutting engagement with the outer coupling discs and the nut is threaded on the shaft to collapse the springs onto the coupling discs to increase the spring force and lock the gear to the shaft. The nut may be released to reduce the spring force and effectively decouple the shaft and gear, thereby permitting controlled release of the tension in the spring drive means.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: September 25, 1984
    Assignee: McGraw-Edison
    Inventor: Robert L. Yach
  • Patent number: 4460947
    Abstract: A light fixture housing includes upper and lower members. The upper member includes a top bounded on four sides by a wall and the lower member includes a bottom also bounded on four sides by a wall. The walls of the two members define four corners of the housing. At each of the corners in the upper member a tang with an inclined leading ramp is formed on the inner peripheral surface of the wall and is flanked at two sides by a guide. At each of the corners of the lower member and upstanding tongue extends above the wall and includes an aperture for receiving the tang when the upper and lower members are assembled. A slot is located in at least one of the corners of the upper member adjacent to the locking tang and a notch is formed in the upper end of at least one of the tongues such that a power line may be threaded through and held within the slot. To assemble the housing, the upper and lower members are positioned together and each of the tongues is positioned within a set of guides.
    Type: Grant
    Filed: April 7, 1983
    Date of Patent: July 17, 1984
    Assignee: McGraw-Edison
    Inventor: James P. Kelly
  • Patent number: 4349804
    Abstract: A fuse assembly for a miniature plug-in fuse is provided with a pair of parallel spaced-apart conductive legs, each having plug-in members at one end. A fuse link of generally constant cross sectional area, integrally formed with the conductive legs, extends therebetween to form a fuse assembly of substantially planar construction. The fuse link is provided with one or more transverse offsets, each forming a weak spot.
    Type: Grant
    Filed: May 29, 1981
    Date of Patent: September 14, 1982
    Assignee: McGraw-Edison
    Inventor: Aldino J. Gaia
  • Patent number: 4245874
    Abstract: A flexible connector assembly for coupling, both mechanically and electrically, sections of electrical distribution track in a track lighting system includes first and second connector segments each having at a first end, a plug-in type tapping mechanism for joining the segments mechanically and electrically to sections of electrical distribution track. A flexible and expandible member formed of a pair of conductive, coiled, wire elements concentrically wrapped in opposite directions with respect to each other, is joined at opposite ends at the second ends, respectively, of the connector segments. The coiled wire elements define a tubular passageway for electrical conductors coupling the connector segments electrically and the member itself provides a ground connection between the connector segments and corresponding track sections.
    Type: Grant
    Filed: March 5, 1979
    Date of Patent: January 20, 1981
    Assignee: McGraw-Edison
    Inventor: Walter F. Bishop
  • Patent number: D274003
    Type: Grant
    Filed: January 15, 1982
    Date of Patent: May 22, 1984
    Assignee: McGraw-Edison
    Inventor: Dennis E. Johnson