Abstract: A connector having a male component and a female component. The male component has a first tubular section, a second tubular section, and a midsection between the first tubular section and the second tubular section. The female component is connected to the second tubular section of the male component upon relative rotational movement between the male component and the female component and disconnected from the second tubular section of the male component upon relative rotational movement between the male component and the female component in a direction opposite to the direction when the male component and the female component are being connected. The female component has a bearing surface bearing against the midsection of the male component in a first position of the bearing surface and is spaced from the midsection of the male component in other positions of the female component.

Abstract: An example arc-fault detection apparatus includes an electrical current measuring device connectable to an electrical circuit and configured to provide a measured signal representing an electrical current flowing in the electrical circuit. A computing device is configured to: acquire a first plurality from samples of the measured signal included into a first time interval and a second plurality of sample from the measured signal included into a second time interval, subsequent to the first time interval; perform a discrete derivative of the first plurality of samples obtaining past derivative samples and a discrete derivative of the second plurality of samples obtaining present derivative samples; compute a derivative similarity index by processing the past derivative samples and the present derivative samples according to an auto-correlation type function quantifying the similarity of the past derivative samples with the present derivative samples.

Abstract: A modular display panel system providing a plurality of modular display panels that can be connected together to form a larger display than any of the display panels. The display panel system has at least one modular display panel that can be releasably secured to at least one other modular display panel. The modular display panel has a panel, a frame assembly, and a jack assembly. The panel providing a display surface on the front and configured to be releasably secured to the frame assembly. The frame assembly having a rectangular structure and providing a first stile, a second stile, a top plate, a bottom plate, and at least one toggle. The first stile having at least one connector and a trifunctional mortise; and the second stile having at least one second connector and a trifunctional mortise. The jack assembly provides a jack leg pivotably secured to the frame assembly, and a locking brace pivotably secured to the jack leg.

Abstract: A connector having a male component and a female component. The male component has a first tubular section, a second tubular section, and a midsection between the first tubular section and the second tubular section. The female component is connected to the second tubular section of the male component upon relative rotational movement between the male component and the female component and disconnected from the second tubular section of the male component upon relative rotational movement between the male component and the female component in a direction opposite to the direction when the male component and the female component are being connected. The female component has a bearing surface bearing against the midsection of the male component in a first position of the bearing surface and is spaced from the midsection of the male component in other positions of the female component.

Abstract: A connector having a male component and a female component. The male component has a first tubular section, a second tubular section, and a midsection between the first tubular section and the second tubular section. The female component is connected to the second tubular section of the male component upon relative rotational movement between the male component and the female component and disconnected from the second tubular section of the male component upon relative rotational movement between the male component and the female component in a direction opposite to the direction when the male component and the female component are being connected. The female component has a bearing surface bearing against the midsection of the male component in a first position of the bearing surface and is spaced from the midsection of the male component in other positions of the female component.

Abstract: A modular display system includes a plurality of frames, each frame comprising a sidewall connected to a sidewall of another one of the frames by a frame connector. A panel is removably attached to a front face of at least one of the plurality of frames by a panel connector. A border element is attached to the sidewall of one of the plurality of frames by a border connector. The system is secured to a mounting surface via a cleat removably mounted to a sidewall of one of the plurality of frames. Each of the frames includes a plurality of connector receiving sections arranged about a perimeter thereof. The connector receiving sections define a commonly sized recess formed through the sidewall of the frame in a width direction thereof and are configured to accept each of the frame connector, the border connector and the cleat therein.

Abstract: A modular display system is provided, and includes a frame having peripheral sidewalls with a plurality of keyhole inserts and mount inserts provided thereabout, each of the plurality of keyhole inserts includes an upper insert section and a lower insert section positioned below and in communication with the upper insert section, each of the plurality of mount inserts includes a fastener receiving passageway and a head accommodation cavity positioned in front and in communication with the fastener receiving passageway. Further including, a panel having a frame with a plurality of raised edging fasteners positioned to correspond with the plurality of keyhole inserts.

Abstract: A modular display system includes a plurality of frames, each frame comprising a sidewall connected to a sidewall of another one of the frames by a frame connector. A panel is removably attached to a front face of at least one of the plurality of frames by a panel connector. A border element is attached to the sidewall of one of the plurality of frames by a border connector. The system is secured to a mounting surface via a cleat removably mounted to a sidewall of one of the plurality of frames. Each of the frames includes a plurality of connector receiving sections arranged about a perimeter thereof. The connector receiving sections define a commonly sized recess formed through the sidewall of the frame in a width direction thereof and are configured to accept each of the frame connector, the border connector and the cleat therein.

Abstract: A connector having a male component and a female component. The male component has a first tubular section, a second tubular section, and a midsection between the first tubular section and the second tubular section. The female component is connected to the second tubular section of the male component upon relative rotational movement between the male component and the female component and disconnected from the second tubular section of the male component upon relative rotational movement between the male component and the female component in a direction opposite to the direction when the male component and the female component are being connected. The female component has a bearing surface bearing against the midsection of the male component in a first position of the bearing surface and is spaced from the midsection of the male component in other positions of the female component.