Tsuden Kabushiki Kaisha

Tokyo Ohka Kogyo Co., Ltd.

Toyoko Kagaku Co., Ltd.

Kabushiki Kaisha Tsuden

Tatekazu Hayashida

Futoshi Shimai

Yohey Omata

Among plural liquid leakage sensors placed at the lower most portion of a system such as a floor surface, a leaked liquid storing portion, etc., an error-activated location of the sensor can be easily identified uniquely when the sensor is detecting any abnormality. In a liquid leakage detecting system including at least one liquid leakage sensor having at least one detecting portion contactable with a leaking liquid through an air layer or a liquid permeable layer, a warning device including a sound producing is placed within a specified spatial distance from each installation position of the liquid leakage sensor, wherein after detecting any abnormal conditions of the liquid leakage sensor, a warning signal is issued at least in an audio frequency based on the warning device in order to discriminate the error-activated leakage sensor from other non-activated leakage sensors placed outside of the specified spatial distance and uniquely identify the installation position of the activated leakage sensor.

Liquid leakage sensor and liquid leakage detecting system

A liquid leakage sensor, paper for detecting liquid leakage, and holder for detecting liquid leakage stably and reliably without being affected by bubbles when a large volume of liquid leaks at once. A liquid leakage sensor also has a tilt detection capability that does not use a test paper and can quickly and reliably detect liquid leakage even before the liquid contacts the case bottom.

Liquid leakage sensor, paper for detecting liquid leakage, and holder for detecting liquid leakage

The present invention provides a door safety system, which operates safely and surely with respect to an automatic door system having doors moving rapidly, and which prevents a person or an obstacle getting near the doors from colliding with the moving doors. Translucent-type and reflex-type non-contact proximity switches are provided at moving doors for detecting a person or an obstacle and for controlling movements of the doors so as to prevent the person or the obstacle from colliding with the moving doors. Furthermore, a cable guide electrically connects the moving doors and a side of building so that the person or the obstacle can be detected with respect to a moving space of the moving doors. Additionally, one or a plurality of signal transmitting sections or signal receiving sections of a non-contact proximity switch are separately provided at an immovable portion, so that the person or the obstacle can be detected with respect to a moving space of the moving doors so as to prevent the person or the obstacle from colliding with the moving doors

Door safety system

In an energy-supplying, signal-transmitting and/or material-supplying apparatus for a linearly-traveling mechanism comprising a movable section reciprocating along traveling guides and supplying-cables/hoses, which is guided and held by a flexible support member, for supplying energy from a non-moving section corresponding to the movable section and/or transmitting and receiving signals to and from the non-moving section and/or supplying/discharging materials from the non-moving section, the support member is composed of a band-shaped solid member formed to an arc-shape which is curved in a lateral direction with one end of the support member fixed to the movable section and the other end thereof fixed to the non-moving section and travels while forming parallel portions which are parallel with the fixed portion of the movable section and the fixed portion of the non-moving section and a curved portion having an approximately constant radius of curvature with the convex direction of the lateral-arc-shaped portion facing inward. With this arrangement, energy, signals and/or materials can be stably supplied to a linearly-traveling mechanism which reciprocates the great many number of times.

Energy-supplying, signal-transmitting and/or material-supplying method and apparatus for linearly-traveling mechanism

In order to realize a power supply device for a sensor which can be used for a long time without any wire linking an outside power source and a movable door so as to supply an electric power, an outside power source contact on a transom and a battery contact on a door are connected when the door is in its closed or open position, induced current is generated from a primary circuit on the transom to a secondary circuit on the door by electro-magnetic induction when the door is in its closed or open position, or electric current is generated by a generator mounted to the door by utilizing the closing and opening movements of the door.

Power supply device for controlling automatic door

A plurality of sensitive high-frequency proximity switches are provided in the bumper of a car and obstacles can be accurately identified. The electronic car bumper includes: a plurality of sensor portions each having sensor plates, first loading coils, and a divided capacitor, and a reference resonance circuit having a reference capacitor, a second loading coil and a divided capacitor. An oscillator drives each of the sensor portions and the reference resonance circuit through switching devices, and a detector detects an output of the oscillator. A discrimination portion discriminates an output of the detector and provides a discriminated signal to an output portion corresponding to the sensors and the reference resonance circuit. A synchronous device switches the switching device and the discriminator portion in synchronization. A direct current amplifier has an output which is adjusted to a point at zero as a reference voltage for the output corresponding to the reference resonance circuit, and a comparator is adjusted to a threshold reference according to the reference voltage.

Growing community of inventors

Kanagawa, Japan

Tatekazu Hayashida