Abstract: A speaker support frame structure and optional cover for recessed mounting of a speaker in a wall or the like. The frame structure incorporates a one-piece, unitary molded frame body which has an open central region, a flattened perimeter region adjacent thereto, an adjacent peripheral upstanding shoulder region, and a terminal outwardly turned collar region. A speaker is nestably received thereon. Leg members are associated with a screw that extends through an orifice formed with the frame body. The leg members pivotally outswing and engage wall surfaces with adjustable clamping force. The frame body can be further provided with a frontal first ridge and also with a cover plate which has a rear second ridge so that the first and second ridge can engage mutually in a connecting relationship.

Abstract: The present invention relates to a fusible switch for use in a multiphase circuit. The switch includes an operating mechanism which is secured to the enclosure of the switch and provides for a handle to operate the opening and closing of switch contacts. Movement of the handle stores energy in the operating mechanism which is subsequently released in a quick motion just as the switch contact is to be opened or closed. The switch also provides for heat sinks and means for venting the enclosure to dissipate the heat created from the higher voltage and greater current density carried by this improved switch.