Abstract: A socket includes: an input terminal configured to be electrically connected to an AC power source; an output terminal configured to output an AC signal of the AC power supply; a switch circuit electrically connected between the input terminal and the output terminal; a step-down circuit electrically connected to the input terminal and configured to reduce the amplitude of the AC signal; a shaping circuit electrically connected to the step-down circuit and configured to convert the AC signal with reduced amplitude into a shaped signal; and a control circuit electrically connected to the shaping circuit and the switch circuit and configured to control the switch circuit based on the shaping signal to enable the switch circuit performs switching operation only when the AC signal is at zero potential. A door includes the socket.

Abstract: A condition detecting method and device for a surface insulation layer of an elevator traction belt. The condition detecting method includes: positioning a detecting component adjacent to the surface insulation layer of the elevator traction belt; moving the elevator traction belt relative to the detecting component, so that the detecting component scans the surface insulation layer of the elevator traction belt; applying static electricity to the detecting component through a static electricity generation component; detecting the reaction of the elevator traction belt to the static electricity; and identifying the condition of the surface insulation layer of the elevator traction belt according to the detected reaction of the elevator traction belt to the static electricity.

Abstract: A spring leaf and an overrunning clutch provided with the same are provided. The spring leaf is made up of a support strip (3-1), a clamping strip (3-2), and a connection beam (3-3). The support strip (3-1) supports a needle roller in suspension. The connection beam (3-3) connects the support strip (3-1) with the clamping strip (3-2). The main body of the clamping strip (3-2) is a straight strip (3-2-1), either end of which is provided with a V-shaped bended part (3-2-2). The overrunning clutch is provided with a retainer, multiple needle rollers, and multiple spring leaves. Mounting grooves for the spring leaves are respectively disposed at positions, corresponding to each crossbeam, on outer end surfaces of a first and a second annular end edge at both ends of a window hole of the retainer. The bottom of the mounting groove for the spring leaf is V-shaped when cut along an axial direction of the retainer.

Abstract: A spring leaf and an overrunning clutch provided with the same are provided. The spring leaf is made up of a support strip (3-1), a clamping strip (3-2), and a connection beam (3-3). The support strip (3-1) supports a needle roller in suspension. The connection beam (3-3) connects the support strip (3-1) with the clamping strip (3-2). The main body of the clamping strip (3-2) is a straight strip (3-2-1), either end of which is provided with a V-shaped bended part (3-2-2). The overrunning clutch is provided with a retainer, multiple needle rollers, and multiple spring leaves. Mounting grooves for the spring leaves are respectively disposed at positions, corresponding to each crossbeam, on outer end surfaces of a first and a second annular end edge at both ends of a window hole of the retainer. The bottom of the mounting groove for the spring leaf is V-shaped when cut along an axial direction of the retainer.