Abstract: A redundant power supply control circuit including a power isolating circuit and a soft start circuit is provided. The power isolating circuit is configured to isolate a first power provided by a first power device from a second power provided by a second power device. When the first power is provided to the redundant power supply control circuit, the power isolating circuit outputs the first power as a main power, and otherwise, the power isolating circuit outputs the second power to a load. The soft start circuit is coupled to the power isolating circuit to receive the main power. The soft start circuit is enabled after the soft start circuit receives the main power, such that the soft start circuit outputs the main power to the load.

Abstract: A redundant power supply control circuit including a power isolating circuit and a soft start circuit is provided. The power isolating circuit is configured to isolate a first power provided by a first power device from a second power provided by a second power device. When the first power is provided to the redundant power supply control circuit, the power isolating circuit outputs the first power as a main power, and otherwise, the power isolating circuit outputs the second power to a load. The soft start circuit is coupled to the power isolating circuit to receive the main power. The soft start circuit is enabled after the soft start circuit receives the main power, such that the soft start circuit outputs the main power to the load.

Abstract: A screw includes a shank with a threaded section extending downwards from a head. A drilling portion is connected to the shank. The drilling portion includes a first body having a point and a conical second body between the first body and the shank. The first body has two opposite and flat first surfaces. Each first surface is connected to a second surface and a third surface. The third surface slopes down from the second surface to the point. Each first surface forms a groove meeting the second surface and the third surface along a cutting edge. A distance between the two first surfaces is ¼˜¾ times a shank diameter. Thus, the effect of accommodating and removing chips and the strength of the first body are promoted. The chips leaving each groove are moved along the second body and then removed to attain a smooth and labor-saving operation.

Abstract: A self-drilling wall anchor device comprises a threaded member having a first threaded section and a second threaded section that provide different diameters, and an outer sleeve having a through hole that provides connective first area, second area, and third area. A second area diameter of the second area is larger than a first diameter of the first threaded section but smaller than a second diameter of the second threaded section. A third area diameter of the third area is larger than the second area diameter of the second area. When the first threaded section and the second threaded section cooperate with the outer sleeve for drilling, the second threaded section blocks the second area and the third area. Arms of the outer sleeve warp and curl out of a gypsum object, not into the gypsum object. The present invention reaches a favorable gripping effect and a preferable anti-retracting performance.

Abstract: A self-drilling wall anchor device comprises a threaded member having a first threaded section and a second threaded section that provide different diameters, and an outer sleeve having a through hole that provides connective first area, second area, and third area. A second area diameter of the second area is larger than a first diameter of the first threaded section but smaller than a second diameter of the second threaded section. A third area diameter of the third area is larger than the second area diameter of the second area. When the first threaded section and the second threaded section cooperate with the outer sleeve for drilling, the second threaded section blocks the second area and the third area. Arms of the outer sleeve warp and curl out of a gypsum object, not into the gypsum object. The present invention reaches a favorable gripping effect and a preferable anti-retracting performance.

Abstract: A wall anchor device includes an anchor sleeve having an outer peripheral lip, one or more peripheral flanges extended outwardly from the middle portion for engaging with a wall member. The anchor sleeve includes a middle portion having one or more arms. A threaded member is engageable into the anchor sleeve and includes a thread shank for threading with the anchor sleeve. A drill element is secured to the threaded member, to drill the anchor sleeve into the wall. The anchor sleeve includes a projecting device for ensuring the threaded member to be engaged with the inner end portion of the anchor sleeve. A positioning device may position the anchor sleeve and the threaded member to the work piece and the wall member.

Abstract: A wall anchor device includes an anchor sleeve having an outer peripheral lip, one or more peripheral flanges extended outwardly from the middle portion for engaging with a wall member. The anchor sleeve includes a middle portion having one or more arms. A threaded member is engageable into the anchor sleeve and includes a thread shank for threading with the anchor sleeve. A drill element is secured to the threaded member, to drill the anchor sleeve into the wall. The anchor sleeve includes a projecting device for ensuring the threaded member to be engaged with the inner end portion of the anchor sleeve. A positioning device may position the anchor sleeve and the threaded member to the work piece and the wall member.

Abstract: A self-drilling wall anchor device has a central bolt, an outer sleeve and a drilling head. The central bolt has a bolt body, a head and a connection portion. The bolt body has a first thread formed around the bolt body. The outer sleeve is mounted around the bolt body of the central bolt and has a flange, a second thread, a compressed head and a deformable portion. The flange is radially formed on and extends from the proximal end of the outer sleeve. The second thread is formed around the outer sleeve near the flange. The compressed head is formed on the distal end of the outer sleeve and has a through hole. The through hole is defined through the compressed head and has a diameter larger than that of the connection portion and smaller than that of the first thread.