The present invention discloses a rotary coupling structure, a power supply device and a sofa, which comprise a fixing base and a rotary coupling plug; the fixing base comprises a mounting member and a rotating member; the mounting member comprises a sleeve provided on the inner wall with a lock slot, a limit buckle disposed at the end of the sleeve, and a side boss disposed on the side wall of the sleeve; the rotary coupling plug, configured to be inserted into the sleeve and connected with a connector, is provided with a rotary lock blade rotatively disposed in the lock slot. With the rotary coupling structure, the power supply device and the sofa provided by the present invention, by making the rotary coupling plug in the rotary coupling structure rotatively disposed on the fixing base, the present invention can firmly install the power supply device in the power input interface of electric products, so as to improve the stability of the mutual electrical connection on the one hand, and can facilitate disassembly, installation and assembly and improve production efficiency on the other hand.

A Bluetooth adapter having rotatable audio plugs includes a housing, a control circuit board, and a power supply unit. The overall structure is compact and reasonable. The Bluetooth adapter is small in size and convenient to take along. When it is necessary to rotate the two audio plugs for use, the right sound channel of the stereo sound channels of the first audio plug can be switched off (that is, only the left sound channel), and the right sound channel of the second audio plug can be used to realize the stereo sound channels, suitable for two audio output ports provided on the seat of the airplane. The Bluetooth adapter is easy to use, has strong compatibility, and improves the overall sound effect.

A heating apparatus for at least one housing section of a screw extruder comprises at least two heating elements which are connected to contact plugs via connection lines. For the purpose of supplying power, the heating apparatus comprises an electrical supply line which is connected to a plug-in contact distributor. The plug-in contact distributor comprises at least two plug-in contacts. The contact plugs are releasably connected to the plug-in contacts. The heating apparatus renders possible simple exchange of a heating element and is therefore easy to service. The modular construction of the heating apparatus renders possible flexible use.

Portable charging is integrated with multi-function electronic device capabilities into a single portable hub package. The hub combines several desirable consumer electronics functions together while at the same time providing a portable reliable power source that can power or charge any device while reducing the carrying weight and complexity of consumer electronics needs. Embodiments include a bi-directional battery, a variety of electrical connection interfaces, and a CPU to coordinate power charging and power distribution to connected devices. Some embodiments may further include other convenient functions including for example, wireless charging, image projection, and software application run-time for applications including media streaming.

A travel power adapter system includes a base unit and a plurality of adapter assemblies. The base unit provides an integral prong configuration associated with an intrinsic electrical plug standard. Each adapter assembly provides a prong configuration associated with a different extrinsic electrical plug standard. The base unit provides a base recess that the integral prong configuration can pivot into in a nested condition. Each adapter assembly provides coupling sleeves dimensioned to slidably receive, in a first direction, the plurality of prongs in the nesting condition, forming an operative association between the base unit and the prong configuration of the adapter assembly, enabling an electrical connection to a receptacle or socket associated with the extrinsic electrical plug standard. The adapter assembly provides a locking unit that engages a locking slot of the base recess, thereby preventing the adapter assembly unintentionally moving in the reverse first direction.

An interchangeable plug charger with a coaxial conductive structure includes a charger body and a plug assembly. The charger body has a retaining surface inside, and the retaining surface has a first conductive terminal and a second conductive terminal. The plug assembly is detachably connected to the charger body and includes a plug socket and the coaxial conductive structure. The coaxial conductive structure includes a hollow insulating column, a first conductively connected component sheathed on the hollow insulating column, and a second conductively connected component connected to the interior of the hollow insulating column. The first conductively connected component is electrically connected to the first conductive terminal, and the second conductively connected component is electrically connected to the second conductive terminal. Therefore, the size of the charger can be reduced and the structure of the charger can be simplified to improve the convenience of carrying and use.

An audio adapter with a frequency modulation (FM) radio function is provided. The audio adapter includes an audio jack, an FM processing circuit, an audio codec, a digital interface, a memory and a processing unit. The FM processing circuit is configured to receive an FM signal through the audio jack and process the FM signal to generate an FM audio. The audio codec is configured to receive the FM audio and output an analog output audio containing the FM audio through the audio jack. The digital interface transmits power. The memory is configured to store multiple codes or program instructions. The processing unit is configured to execute the codes or program instructions to control the FM processing circuit to search for FM channel(s).

The present disclosure relates to telephone jack covering systems that advantageously render existing telephone jacks more attractive and useful. The systems disclosed include a novel bracket that allows for existing telephone jacks to be covered with decorative and functional devices. In a preferred embodiment, an existing telephone jack is outfitted with a bracket and covered with a converter device that converts the existing telephone jack into a smart device charging station.

Systems, methods, and apparatus to facilitate wireless device monitoring and control are provided. A first device controller may be adapted to be disposed within a power connector, in series with conductors of the power connector. The power connector may be adapted to provide power from a power source to a device. The first device controller may include two terminals to electrically couple the first device controller with the conductors of the power connector. The first device controller may further include a power component to power the first device controller. The first device controller may be configured to monitor one or more conditions of the device, control one or more functions of the device, and wirelessly communicate with a system controller that is remote from the power connector and the device. The power connector may correspond to a power plug and/or a terminal block.

A variety of active cover plate configurations with prongs configured to contact side screw terminals of electrical receptacles are described. In one illustrative embodiment, an active cover plate includes a multi-gang face plate configured to be installed over a multi-gang light switch installation, the multi-gang faceplate including at least two apertures sized to accept a manually manipulatable element of switches in the multi-gang light switch installation. Prongs extend rearward from the multi-gang faceplate around at least one of the apertures.