Abstract: A transmission shaft assembly includes a carbon-fiber tube having two ends, and each end has protrusions and recesses which are located alternatively to the protrusions. Two connectors each have an outer tubular portion and an inner tubular portion extending axially therefrom. Multiple first engaging portions and multiple second engaging portions are located between the outer tubular portion and the inner tubular portion of each of the connectors. The two connectors are respectively connected to the two ends of the carbon-fiber tube. The first engaging portions are engaged with the recesses, and the second engaging portions are engaged with the protrusions. Adhesive is applied between the connectors and the carbon-fiber tube.

Abstract: A transmission shaft assembly includes a carbon-fiber tube having two ends, and each end has protrusions and recesses which are located alternatively to the protrusions. Two connectors each have an outer tubular portion and an inner tubular portion extending axially therefrom. Multiple first engaging portions and multiple second engaging portions are located between the outer tubular portion and the inner tubular portion of each of the connectors. The two connectors are respectively connected to the two ends of the carbon-fiber tube. The first engaging portions are engaged with the recesses, and the second engaging portions are engaged with the protrusions. Adhesive is applied between the connectors and the carbon-fiber tube.

Abstract: A support for a display which allows for the safe supply of electrical power when the display is reoriented includes a mounting board for mounting a display and a rack. The rack includes a power port and a power rail electrically connected to the power port. A slip assembly is slidable mounted on the rack. The mounting board is secured on the slip assembly. The slip assembly includes a conduction piece which is electrically connected to a display. The conduction piece is in electrical contact with different portions of the power rail when the slip assembly slides on the rack.

Abstract: A multi-purpose fluid supply device includes a main body portion, a working portion, a bubble generation portion, and a fluid guide portion. The multi-purpose fluid supply device can be changed among an air spray mode, a dust collection mode, a water spray mode and a bubble spray mode so as to achieve a four-in-one gun. The multi-purpose fluid supply device is mobile and can be used widely.

Abstract: A demonstration device includes a handheld terminal and a receiving terminal. The handheld terminal includes a mode switch key, and a first micro control unit. The mode switch key can generate a mode switch trigger signal to change from TV signal mode for example, to whiteboard mode. The receiving terminal includes a second micro control unit, and a mode switch executing unit. The second micro control unit can receive the mode switch control signal, and the mode switch executing unit can switch the receiving terminal from TV signal mode to a whiteboard mode according to the mode switch control signal. The receiving terminal draws a picture with lines of particular colors and widths according to movements of the handheld terminal when held in a user's hand.

Abstract: A protective cover allowing unrestricted functionality to an electronic device includes a foldable protective board and a receiving portion containing the electronic device. The protective cover also includes a solar panel, a keyboard with touch input function and a wireless module. The wireless module is configured for wirelessly connecting the keyboard with the electronic device. A method for operating the protective cover is also provided.

Abstract: A demonstration device includes a handheld terminal and a receiving terminal. The handheld terminal includes a mode switch key, and a first micro control unit. The mode switch key can generate a mode switch trigger signal to change from TV signal mode for example, to whiteboard mode. The receiving terminal includes a second micro control unit, and a mode switch executing unit. The second micro control unit can receive the mode switch control signal, and the mode switch executing unit can switch the receiving terminal from TV signal mode to a whiteboard mode according to the mode switch control signal. The receiving terminal draws a picture with lines of particular colors and widths according to movements of the handheld terminal when held in a user's hand.

Abstract: A support for a display which allows for the safe supply of electrical power when the display is reoriented includes a mounting board for mounting a display and a rack. The rack includes a power port and a power rail electrically connected to the power port. A slip assembly is slidable mounted on the rack. The mounting board is secured on the slip assembly. The slip assembly includes a conduction piece which is electrically connected to a display. The conduction piece is in electrical contact with different portions of the power rail when the slip assembly slides on the rack.

Abstract: A KVM switch has a switching device, a first computer video interface, a second computer video interface, an image processing unit, and at least one console video interface. The switching device is arranged to select a first computing device and a second computing device from the computing devices. The first computer video interface is arranged to receive a first image from the first computing device, and the second computer video interface is arranged to receive a second image from the second computing device. The image processing unit is arranged to compose the first image and the second image to be a synthesized image. The console video interface is arranged to output one of the first image, the second image and the synthesized image to the set of user interface devices.

Abstract: A control system for controlling a keyboard-video-mouse (KVM) switch interconnecting among at least one set of keyboard, video, mouse of a console and a plurality of computers comprises a first memory and at least one embedded module. The first memory stores a plurality of control instructions to control operational signals for the keyboard-video-mouse switch. The embedded module comprises a core unit, a second memory and a decoder. The core unit executes the control instructions fetched from the first memory to control the keyboard, video, mouse signals from or to the keyboard-video-mouse switch. The second memory is accessed by the core unit to load and store at least an operational signal through a communication among the console and the computers. The decoder coupled to the core unit and the first memory respectively decodes the control instructions stored in the first memory.