Imasen Electric Industrial Co., Ltd.

Other

Noriatsu Kojima

Toshihiko Kawamura

Koichi Toyama

Yoshio Miyata

Katsunori Uchimura

Junjiro Yoshimura

Takashi Yamada

Yozo Kako

Tetsuo Momo

An electronic horn for use, e.g., in a vehicle, includes a piezoelectric element () that excites a plate-shaped oscillator (). A resonator () is provided with an opening () and covers forward of the oscillator such that a resonance space (S) is defined between the resonator and the oscillator. An inner cylinder () and an outer conical housing () are provided concentrically around the resonator. A circular cover () covers the inner cylinder () and the outer conical housing () from the front, such that a buffer chamber (BR), at least one first sound amplifying chamber (MH), and a second sound amplifying chamber (MH) are defined around an entire circumference of the opening of the resonator.

Electronic horn

An electronic horn includes a cover () on a front side of an intermediate element (). A first passage (P) within the horn is defined by a central portion () of the cover () that projects into a cylindrical interior of a cylindrical water-proofing wall (). Second passages (PPP) extend generally concentrically with respect to the first passage (P) and are respectively defined by water-proofing walls () that are formed on the cover () and project into the interior spaces of water-proofing walls (). The outermost second passage (P) opens toward the forward direction. The first and second passages (P-P) extend in a back-and-forth path that prevents any rainwater, which has entered the interior of the horn through the opening of the outermost second passage (P), from reaching a resonance space () defined between the resonator () and a sound-generating oscillator ().

An electronic vehicle horn outputs a warning sound by exciting a diaphragm using a piezoelectric device that is driven with a composite signal generated, in part, by modulating a first fundamental square wave with a first modulating square wave and setting a frequency deviation at the time of the modulation in a predetermined range, modulating a second fundamental square wave with a second modulating square wave and setting a frequency deviation at the time of the modulation in a predetermined range, and generating the composite signal by mixing the modulated first fundamental square wave and the modulated second fundamental square wave.

Electronic vehicle horn

The invention relates to a drainage collective pipe joint where wastewater flowing in a collective housing of multiple floors is subjected to swirl flow and is allowed to flow down. The drainage collective pipe joint comprises an upper vertical pipe connection port to connect an upper vertical pipe, a main body part having a taper pipe part formed in downward taper shape at lower side and installed at lower side of the upper vertical pipe connection port, a lower vertical pipe connection port installed at lower side of the main body part and capable of connecting a lower vertical pipe, at least one horizontal branch pipe connection port installed at the main body part and connected a horizontal branch pipe, and a plurality of drainage flow control guides projected from an inner circumferential wall at lower side of the horizontal branch pipe connection port of the main body part and capable of controlling the drainage flow. The plurality of drainage flow control guides comprise at least one upper drainage control guide installed at upper side in the pipe direction and at least one lower drainage flow control guide installed at lower side in the pipe axial direction. According to the drainage collective pipe joint, the flowing-in wastewater is prevented from flowing reversely into the horizontal branch pipe and the wastewater is reduced in flow rate and swirled and the fluctuation of the air pressure in the drainage system can be suppressed.

Growing community of inventors

Nagoya, Japan

Toshihiko Kawamura