Abstract: Method implementing a generic computer human input device using key event signal coding compliant to the standard protocols so as to expand its application range without losing plug-and-play property. Applications of the present invention include audience response, gaming, legacy system support and cross-platform system integration, for example.

Abstract: A pivot cover can incorporate with an ink cartridge to close an ink refill opening of the ink cartridge. The pivot cover has a cover body having a leaning portion, and a push member is extended from an end of the cover body while a fastening member is extended from another end of the cover body. The fastening member has a pivot hole. A pushing portion is disposed to an upper end of the push member while an embedding portion is disposed to a lower end of the push member, and the embedding portion protrudes the leaning portion. While pushing the pushing portion, the push member takes the pivot hole as an axle core to allow the pivot cover to rotably perform opening and closing motion so that the embedding portion can be positioned to allow the leaning portion to close the ink refill opening of the ink cartridge.

Abstract: An improved ink cartridge structure comprises a cartridge body, and a first panel and a second panel disposed to two sides of the cartridge body to seal the cartridge body. An ink throttle layer is disposed in the cartridge body. A containing tank is formed at a side of the ink throttle layer. An ink supply passage having bend channels is disposed to another side of the ink throttle layer. An ink inlet is disposed to an end of the ink supply passage. The ink inlet has two air holes that communicate with the containing tank. Another end of the ink supply passage is engaged with a filter port. The filter port is engaged with an ink outlet storing chamber. The ink outlet storing chamber is connected to an ink outlet. With the ink supply passage and the two air holes, pressure can be reduced, and ink flow can be regulated.

Abstract: A method makes it possible to establish PTT connections among mobile communication devices that belong to different service groups of different servers. The mobile communication devices are capable of directly transmitting signals and data to each other in a peer-to-peer manner according to session initiation protocol (SIP). The permission to speak is transferred among the mobile communication devices by transmitting specific signals according to predetermined paths of signal delivery.

Abstract: A laser gun for recreation has a body, a laser device, an air start system and a firing device. The body has a barrel with a bottom and a handle is formed at the bottom. The laser device is mounted in the body and has a laser generator that produces and emits a laser beam through a muzzle of the barrel when a laser switch is closed. The air start system provides the compressed air to switch the laser switch on when a trigger of the firing device is squeezed. The compressed air escaping through exhaust holes generates a gunshot like sound and a movement to the laser gun when the laser gun is fired to simulate a real gun.

Abstract: An audio-visual system includes a signal source, a distributor, a control box, a control panel, and a sound reproducing unit. The signal source provides at least an audio source signal. The distributor includes a pre-amplifier coupled electrically to the signal source for amplifying the audio source signal therefrom, and an impedance matching circuit coupled electrically to the pre-amplifier for matching load impedance associated with an amplified audio source signal from the pre-amplifier to that of the signal source. The control box is coupled electrically to the distributor for processing and amplifying an impedance-matched signal received therefrom. The control panel is coupled electrically to the control box for receiving output of the control box. The sound reproducing unit is coupled electrically to the control panel for audio reproduction.

Abstract: A shooting exercise allows multiple shooters to shoot laser beams simultaneously at a target with several receivers with a laser gun. First, each laser gun held by each shooter is tuned to a unique frequency. Second, the shooters simultaneously shoot laser beams at the target. Third, receivers on the target register target hits. Fourth, a hit signal is sent to a host by the receiver when a receiver is struck by a laser beam. Fifth, the host processes the hit signals and produces a result. Then, the results are displayed on a monitor to show the hits of each shooter. Finally, a speaker sends out a sound.

Abstract: The present invention has a microprocessor, a head sensor, a graphic display and a keypad. When a distance between the heat sensor and heat source changes, a frequency of a wave pattern shown on the graphic display has high and low states. The user just sees the graphic display to clearly know whether the heat source close to the body from the frequency of wave pattern changing. Besides the heat detector further has at least one laser diode to point a position corresponding to the location of the heat source and an alarm unit to warn the user that the heat source is closing.

Abstract: A variably-weighted exercise hoop includes a plurality of large hollow balls, a plurality of plugs corresponding to and received in the balls, and a cable extending through and securing together the combined balls and plugs. A fixed quantity of pellets is enclosed in each combined ball and plug, and that quantity is varied by the manufacturer to achieve hoops of different weights using only one mold, whereby users of different abilities can have suitable hoops. The pellets provide both audible and physical rhythms for a user as the hoop rotates.