Abstract: A position retention device includes a pivot member having a mounting axle, a cylindrical seat, a cylindrical housing and an annular member. A cylindrical seat is mounted co-axially on the mounting axle of the pivot member, and has pluralities of circumferentially formed and alternately disposed north and south pole sectors. A cylindrical housing is mounted co-axially and rotatably on the mounting axle of the pivot member. An annular member is disposed within the annular receiving chamber in the cylindrical housing for simultaneous rotation with the cylindrical housing. The annular member has pluralities of circumferentially formed and alternately disposed north and south pole sectors. Position of the cylindrical housing is retained stationarily with respect to the cylindrical seat by virtue of attraction between adjacent two of the north or south pole sectors of the cylindrical seat and the annular member.

Abstract: An electronic device having a keyboard fixed through a set of suckers and most suitably applied to the host body of an electronic product is provided. The electronic device includes a casing, a keyboard module and at least a sucker. The keyboard module has at least a key and the sucker is used for attaching the keyboard module to the casing. Furthermore, the sucker includes a first coupling part and a second coupling part. The first coupling part is used for sucking up the keyboard module and the second coupling part is used for fixing the sucker to the casing so that the electronic device and the host body can be assembled together smoothly.

Abstract: A hinge assembly includes an inner ring and an outer ring. The outer ring has an outer ring slot penetrating the sidewall of the outer ring and connecting both ends of the outer ring. The inner ring has an inner ring slot penetrating the sidewall of the inner ring and connecting both ends of the inner ring. The inner ring is coaxially connected to the outer ring. When the inner ring slot and the outer ring slot are aligned, an electrical connecting device can pass through the inner ring slot and outer ring slot to stay in the hinge assembly.

Abstract: A wire-to-board connector for coupling electrically a circuit board to a transmission wire unit, includes a plug receptacle, a plurality of signal contacts and a mating header. The plug receptacle is mounted on the circuit board. The mating header includes an insert body that is disposed at one end of the transmission wire unit and that has a plurality of resilient metal elements. When the insert body is plugged into the plug receptacle, the resilient metal elements respectively contact with the signal contacts of the plug receptacle, thereby establishing electrical communication with the circuit board and the transmission wire unit.

Abstract: A mobile phone includes a main body, a first magnetic device, a slide cover and a second magnetic device. The first magnetic device is disposed on the main body. The slide cover is slidably connected to the main body and can slide relative to the main body. The second magnetic device is disposed on the slide cover. When the slide cover moves to a distance relative to the main body, the first magnetic device attracts the second magnetic device so that the slide cover slides to a first positioning point.

Abstract: A position retention device includes a pivot member having a mounting axle, a cylindrical seat, a cylindrical housing and an annular member. A cylindrical seat is mounted co-axially on the mounting axle of the pivot member, and has pluralities of circumferentially formed and alternately disposed north and south pole sectors. A cylindrical housing is mounted co-axially and rotatably on the mounting axle of the pivot member. An annular member is disposed within the annular receiving chamber in the cylindrical housing for simultaneous rotation with the cylindrical housing. The annular member has pluralities of circumferentially formed and alternately disposed north and south pole sectors. Position of the cylindrical housing is retained stationarily with respect to the cylindrical seat by virtue of attraction between adjacent two of the north or south pole sectors of the cylindrical seat and the annular member.

Abstract: An electronic device having a keyboard fixed through a set of suckers and most suitably applied to the host body of an electronic product is provided. The electronic device includes a casing, a keyboard module and at least a sucker. The keyboard module has at least a key and the sucker is used for attaching the keyboard module to the casing. Furthermore, the sucker includes a first coupling part and a second coupling part. The first coupling part is used for sucking up the keyboard module and the second coupling part is used for fixing the sucker to the casing so that the electronic device and the host body can be assembled together smoothly.

Abstract: A hinge assembly includes an inner ring and an outer ring. The outer ring has an outer ring slot penetrating the sidewall of the outer ring and connecting both ends of the outer ring. The inner ring has an inner ring slot penetrating the sidewall of the inner ring and connecting both ends of the inner ring. The inner ring is coaxially connected to the outer ring. When the inner ring slot and the outer ring slot are aligned, an electrical connecting device can pass through the inner ring slot and outer ring slot to stay in the hinge assembly.

Abstract: A holder located on a casing using for loading a hard disk includes a bottom surface, at least a first elastic element and at least a second elastic element. The bottom surface is facing to a first surface of the casing. The first elastic element is located on the bottom surface having a first end connected to the bottom. At least a part of the first elastic element is configured through an opening and clipped on a second surface of the case. There is at least an opening configured through the first surface and the second surface. The second surface is in opposition to the first surface. A third end of the second elastic element is connected to the bottom surface, and at least a part of the second elastic element contacts against the first surface.

Abstract: A revolving lens module mounted to a case of a mobile communication device includes a revolving lens. The revolving lens has a rotating axis pivotally mounted to a hole of the case and an image-capturing unit for capturing images. By providing the pivotal pair of the hole and the rotating axis, the revolving lens can then have a 180 viewing range with respect to the case of the mobile communication device.

Abstract: A device having a magnetically rotary cover mechanism is disclosed. Coupled magnets are pivotally mounted on one side of a cover cap of the device, and an attractive or repulsive force between the coupled magnets controls the cover cap to close an opening. The present invention uses the coupled magnets to replace the conventional elastic members for controlling the cover cap to close the opening, thereby simplifying and saving the process and time for assembling the device.

Abstract: A wire-to-board connector for coupling electrically a circuit board to a transmission wire unit, includes a plug receptacle, a plurality of signal contacts and a mating header. The plug receptacle is mounted on the circuit board. The mating header includes an insert body that is disposed at one end of the transmission wire unit and that has a plurality of resilient metal elements. When the insert body is plugged into the plug receptacle, the resilient metal elements respectively contact with the signal contacts of the plug receptacle, thereby establishing electrical communication with the circuit board and the transmission wire unit.