Abstract: A food container is provided with a container body; a retaining ring; an inlet and outlet mechanism; and a cover. In response to securing the retaining ring to the inlet and outlet mechanism, securing the retaining ring to the container body, and connecting a second conductor to a second terminal of a micro switch, a pressure sensor pushes a resilient member to close the micro switch to supply power from a power source to a motor, a vacuum pump is activated by the motor, a plunger moves to block an open end of a second stop on a second pipe so as to remove air from the container body through a first pipe, the air is drawn into a closed space via an air inlet and a second opening, and the air enters the pressure sensor via a bossed hole, thereby producing a vacuum in the container body.

Abstract: A wireless receiver includes a low noise amplifier (LNA), a tuner, a demodulator, and an automatic gain controller (AGC). The LNA receives a radio frequency (RF) signal and amplifies the received RF signal. The tuner converts the amplified RF signal to an intermediate frequency (IF) signal. The demodulator demodulates the IF signal. The AGC generates a gain control signal. The LNA applies normal mode to amplify the received RF signal when the gain control signal is larger than a first predetermined voltage; and enters a degradation mode to reduce the strength of the received RF signal when the gain control signal is below a second predetermined voltage lower than the first predetermined voltage.

Abstract: A vacuum fresh-keeping cover includes an upper cover, a top of which is connected with an air suction-ventilation device, a lower rim of which is connected with a soft gasket that can be suppressed on any horizontal surface, and an interior of which is formed with a container space. When a barometric value of the container space gets larger, the air suction-ventilation device is activated to expel out air in the container space continuously, to keep the container space at a near vacuum condition for preserving objects or food. When pulling up a touching element of the air suction-ventilation device, the air in the container space is drained out by the air suction-ventilation device to quickly remove the upper cover, to facilitate consumers for use, and to conveniently separate the air suction-ventilation device from the upper cover, for easily washing the upper cover with water.

Abstract: A vacuum fresh-keeping cover includes an upper cover, a top of which is connected with an air suction-ventilation device, a lower rim of which is connected with a soft gasket that can be suppressed on any horizontal surface, and an interior of which is formed with a container space. When a barometric value of the container space gets larger, the air suction-ventilation device is activated to expel out air in the container space continuously, to keep the container space at a near vacuum condition for preserving objects or food. When pulling up a touching element of the air suction-ventilation device, the air in the container space is drained out by the air suction-ventilation device to quickly remove the upper cover, to facilitate consumers for use, and to conveniently separate the air suction-ventilation device from the upper cover, for easily washing the upper cover with water.

Abstract: A vacuum type food container is disclosed to include a container body, which holds a filter element in a suction hole thereof and a dehumidifier box in a recessed hole thereof, an air pump for pumping air out of the suction hole to keep the container body in a vacuum status, a micro switch coupled to a rubber bellows tube to automatically turned on/off the air pump subject to the vacuum status of the container body, and a control button for pressing by the user to open the top cover shell from the container body and to discharge air out of the container body.

Abstract: A pedal-operated trashcan type paper shredder includes a container, a cover with a narrow paper insertion slot pivoted to the container for closing/opening the container, a push bar vertically provided at one side of the container and adapted to move the cover between the open position and the close position, a pedal pivoted to the container for pressing by the user's foot to lift the push bar to open the cover from the container, and a paper-shredding unit mounted inside the cover corresponding to the paper insertion slot for shredding paper into pieces.

Abstract: A circuit arrangement for lamps with melody output includes a switch having a common end connected to an AC voltage source and three contact ends, two rectifiers each respectively connected to a contact end of the switch via a connector, a melody circuit for outputting an audio signal via a speaker, two timers each respectively connected between one of the rectifiers and the melody circuit for controlling the duration of the output audio signal, a lamp driving circuit connected to the melody circuit for receiving a lamp driving signal from the melody circuit, a lamp set connected to all of the contact ends of the switch, and a voltage regulation circuit connected to the AC voltage source via the connector for supplying a power signal to all of the electronic circuits.