A buzzer comprises an annular magnet, a coil disposed at the inside of the magnet, a vibration plate disposed above said magnet, a core inserted into the central opening of said coil and with its one end facing said vibration plate, a case and a yoke. Said magnet said vibration plate and said yoke are held by the magnetic attraction of the magnet.

A warning buzzer having an armature arranged to strike the wall of the cavity formed by the buzzer housing to increase the sound emitted thereby. The buzzer includes terminals molded in a base with one terminal having a coil core and magnetic return leg formed thereon with the coil bobbin received on the core having a pair of lugs on which the coil terminals are wrapped and dip soldered. The dip soldered lugs are then staked in the terminal and in a contact member for both supporting the coil an...

A piezoelectric buzzer includes a piezoelectric diaphragm stored in a case having a case body and a back cover, and a pair of metal terminals which are electrically connected to the piezoelectric diaphragm and drawn out from the back cover. The metal terminals have terminal drawing portions, terminal fixing portions which are arranged along an inner surface of the back cover, and connecting portions which are bent from inner ends of the terminal fixing portions so that the bent portions are subs...

A buzzer assembly including a casing mounted with an ornament, an IC board mounted within the casing and carrying a battery and an IC, a buzzer mounted in the casing and connected to the IC, a coupling plate mounted in the casing, a top cover mounted within the casing and covered on the IC board and the buzzer and having a rubber press cone with a electric conducting element, a plurality of light emitting elements respectively connected to the IC, and a bottom cap covered on the casing at one si...

A safety mechanism for alerting power line workers of the failure to properly connect a grounding wire to a neutral wire. The grounding buzzer automatically provides an audible and/or visual output when disconnected from a storage location and continues to provide the alarm until it is properly installed. An alarm is optionally installed on both the connecting hook and the vehicle to alert as many individuals as possible to the failure to properly connect the grounding wire.

A small and thin buzzer which can be mounted on a printed circuit board. A buzzer assembly and a lead connecting chamber are provided in a buzzer case. One end of each of the terminals for external connection is extended to the inside of the lead connecting chamber and the exciting coil terminals of the buzzer assembly are connected to the terminals for external connection within the buzzer case. A lead groove for leading the exciting coil terminals therethrough are provided on the inner surface...

Disclosed is a communication buzzer. The communication buzzer comprises a nonconductive magnetic piece having substantially a cup-shaped configuration so that it possesses a bottom wall portion and a main wall portion which extends upward from the bottom wall portion; a magnetizable shaft securely fixed to the bottom wall portion of the nonconductive magnetic piece and projecting upward and concentrically with the main wall portion of the nonconductive magnetic piece; an electromagnetic actuator...

Disclosed is a diaphragm buzzer including a lower cover and an upper cover. A sheet buzz element having a centered diaphragm is disposed inside the lower and the upper cover and is protectively sandwiched between a press plate and a plastic washer before it is fixed to the upper cover, lest the sheet buzz element should detach from the wires connecting it to a circuit board and become loose and damaged in the two covers.

A garage door opener system includes a radio receiver actuable by reception of a preselected radio signal for moving a garage door between opened and closed positions and a portable hand-held transmitter manually actuable to transmit such preselected radio signal to the receiver. The transmitter includes a radio frequency oscillator for producing the radio signal to be transmitted and a modulating means manually actuable to cause the oscillator to transmit a radio signal which is of the preselec...

This invention relates to contactless buzzer unit wherein audible signals are delivered by mechanical blows of a resonator membrane by an electromagnetically driven vibrator fed from an electronic circuit with oscillating voltage pulses. A base section is provided by an electromagnetic drive unit having an iron core and a drive coil fixedly mounted on a base plate, while a casing section is provided by an audio-signaling unit including the resonator membrane, a spacer and a vibrator assembled to...