Abstract: A locking structure includes a hook disposed on a first object and engagable with a locking member disposed on a second object. The locking member includes a main body rotatable about an axis thereof and a number of locking portions radially protruding from the main body. When the main body rotates about the axis, the locking portions rotate together with the main body to engage with and disengage from the hook to lock the first object to and unlock the first object from the second object.

Abstract: An electronic device includes a front frame, a back cover coupled to the front frame, a speaker, a rubber casing to partly receive the speaker, the rubber casing being received in a cavity defined in the front frame, and a cap attached to the front frame and tightly pressing against the rubber casing, thereby holding the speaker in position.

Abstract: An electronic device includes a housing, a first positioning component, a second positioning component, a key switch and a key mechanism. The first and second positioning components are arranged in the housing. The key mechanism is movably secured to the housing and includes an actuating component slidably arranged on an inner surface of the housing and capable of triggering the key switch when sliding relative to the inner surface. The first and second positioning components abut opposite sides of the actuating component for preventing the actuating component from shimmying when the actuating component slides relative to the inner surface.

Abstract: A folding device includes a main body, a cover, and a torsion spring. The cover is rotatably connected to the main body and capable of covering the main body, the cover comprising a supporting member. The torsion spring renders the cover spring-loaded, to rotate the cover open from the main body. The torsion spring includes a coil, a first arm and a second arm. The first arm includes a first portion extending from one end of the coil along a first direction that is perpendicular to an axis of the coil; and a second portion extending from the end of the first portion along a second direction different from the first direction. The first portion and the second portion support the supporting member from different positions and different lengths when the cover is opened. The second arm restricts against the main body.

Abstract: A fastening structure for fastening a circuit board, includes a loading member, a holding member, and a fixing member. The loading member is positioned inside of an electronic device. The holding member protrudes from the loading member. The fixing member protrudes from the loading member. When the circuit board is fastened, the holding member presses on the circuit board, and the fixing member passes through a fixing hole define in the circuit board, so as to restrict the circuit board to move in a first plane parallel to the circuit board, and a second plane perpendicular to the circuit board.

Abstract: A locking structure includes a hook disposed on a first object and engagable with a locking member disposed on a second object. The locking member includes a main body rotatable about an axis thereof and a number of locking portions radially protruding from the main body. When the main body rotates about the axis, the locking portions rotate together with the main body to engage with and disengage from the hook to lock the first object to and unlock the first object from the second object.