Nitto Kohki Co., Ltd.

Nikki Co., Ltd.

Iwaji Shiomi

Akira Takanaka

Toshio Mikiya

Haruki Nakao

Giichiro Shimizu

Masaaki Tanabe

Nobuyuki Nozawa

Hirokazu Nagai

Provided is a low-noise, long-life electromagnetic blower that has a simple, low-priced configuration and can realize two different outputs, high and low. When the electromagnetic blower is operated with low output, coils of an electromagnet are connected in series with each other, and an alternating current is supplied from an AC power source. When the blower is operated with high output, on the other hand, current is supplied to the one coil only. In the case where the electromagnetic blower is used for sewage disposal, the electromagnetic blower is operated with low output during aeration and with high output during reverse cleaning operation. Thereupon, the electromagnetic blower can operate with low noise during aeration, and the efficiency of reverse cleaning can be improved. In order to operate the electromagnetic blower with high output, moreover, the coils of the electromagnet may be connected in parallel with each other.

Electromagnetic blower and two-passage air supply apparatus

A blower supplies compressed air to a predetermined place. The blower is provided with a plurality of compressors, a common air tank for storing compressed air supplied from the compressors, a changeover valve for switching the compressed air taken in from the air tank between a first supply state and a second supply state, and a controller for controlling operations of the compressors and the switching operation of the changeover valve. The controller can select one operation pattern from among a plurality of operation patterns determined by combinations between the compressors and the changeover valve.

Blower

A piston and a plurality of passages (first to fourth or fifth passages) are provided in a cylinder for reciprocation, which piston has a recessed portion formed in the central part thereof, so that the suction system of two suction pumps can automatically be switched between a parallel coupling and a series coupling depending on the piston's position in the cylinder. The pressure in a pressure chamber provided adjacently to the cylinder is changed by means of a pilot valve provided so as to operate when the negative pressure of the pumps become a predetermined value, and the piston is moved between its first and second positions by means of a diaphragm which constitutes a part enclosure of the pressure chamber and deforms in response to the change of the pressure in the pressure chamber, thereby the suction system is switched from parallel to series or vice versa.

Switching apparatus for suction system in a vacuum pump

A gas separation/extraction apparatus comprises a tank for separating and extracting a specific gas element from a gas mixture, the tank containing an adsorbent for adsorbing the gas element from the gas mixture, a pump having a cylinder and a piston housed therein, the pump being adapted to alternately pressurize and decompress the inside of the tank as the piston reciprocates, a first three-way solenoid valve connected between an exhaust port of the tank and a suction port of the pump, a second three-way solenoid valve connected between a discharge port of the pump and the suction port of the tank, and a pressure balance unit connected between the second three-way solenoid valve and a suction port of the tank, and adapted gradually to eliminate a difference in pressure between the tank and the pump as the tank is switched from a decompressed state to a pressurized state.

Gas separation/extraction apparatus for separating and extracting a

A pilot pin-locking means for a drilling machine including a drilling tool, a hollow shaft for supporting the drilling tool and provided with a lubricating means, a bearing means mounted on the drilling machine, the shaft being supported by the bearing means for vertical movement and rotation about an axis, further including a pilot pin inserted through the center of the drilling tool for vertical movement. The hollow shaft receives an engaging means that engages the pilot pin under the resilient action of a spring in a vertically movable manner. The engaging means is detachably locked to and biased against the inner face of the hollow shaft.

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Tokyo, Japan

Iwaji Shiomi