Abstract: A mouse scroll wheel module includes a retention part, a holding part sitting on the retention part to swing from front to back and from left to right, a revolving part installed on the holding part, a mechanical revolving encoder to receive output of encoded electronic signals as the revolving part rotates, and a circuit board for controlling a middle switch and right and left switches, fixed between the retention part and the holding part. The holding part comprises a swing base and a holder that supports the swing base. With the support of the holding part, the scroll wheel of the revolving part is able to rotate and swing laterally, making the currently selected window on the screen to scroll in four directions: up, down, left or right.

Abstract: A receiving structure for a receiver of a wireless mouse is disclosed. An accommodating slot for receiving a receiver is disposed on rear end of an upper cover of a wireless mouse. And a vertical pin on an arm is arranged on center line of a bottom plate of the accommodating slot. The vertical pin moves elastically and turns back automatically while being forced. An elastic member and a limit switch for power control are disposed in front of the accommodating slot. Two consecutive front and rear stopping plates corresponding to the vertical pin are disposed on bottom of the receiver and two sloped guiding surfaces in opposite directions are arranged on the front and rear stopping plates respectively. When the receiver plugs into the accommodating slot, the sloped guiding surface of the front stopping plate presses the pin to move outwards, away from the central line and then leaves the rear end of the sloped guiding surface and locks into the arc of the front stopping plate.

Abstract: A mouse scroll wheel module includes a retention part, a holding part sitting on the retention part to swing from front to back and from left to right, a revolving part installed on the holding part, a mechanical revolving encoder to receive output of encoded electronic signals as the revolving part rotates, and a circuit board for controlling a middle switch and right and left switches, fixed between the retention part and the holding part. The holding part comprises a swing base and a holder that supports the swing base. With the support of the holding part, the scroll wheel of the revolving part is able to rotate and swing laterally, making the currently selected window on the screen to scroll in four directions: up, down, left or right.

Abstract: An automatic infusion-monitoring instrument includes a clip adapted to clamp a flow-indicating cylinder of an infusion set corresponding to a liquid level in the cylinder that keeps unchanged when there is sufficient amount of infusion liquid in the infusion set, a floater pre-disposed in the flow-indicating cylinder to move upward and downward along with the liquid level in the flow-indicating cylinder, a detecting unit having an emitter and a receiver mounted in the clip to normally face the floater, and an alarm unit electrically connected to the detecting unit via a conducting wire. When the liquid level in the flow-indicating cylinder lowers so that the floater is moved to locate below the emitter and the receiver and no longer blocks the wave emitted by the emitter, the alarm unit is actuated to emit sound, voice, light or flash as a warning signal of running-out infusion liquid.