Matsushita Electric Works, Ltd.

Koichi Ishino

Yukio Yamamura

Tsutomu Ichinomiya

Kuniyuki Odaka

Masayuki Nakamura

A fluid pump has a pumping member which defines the boundary of a pump chamber and is driven to reciprocate between the positions of expanding and contracting the pump chamber for drawing in the pump chamber a fluid and feeding it into a vessel to be pressurized thereby. The pumping member is connected to the output shaft of a reversible motor through a driving linkage capable of translating the rotary motion of the output shaft into the reciprocating motion of the pumping member. A release valve is provided in a fluid path between the pump chamber and the vessel for rapidly releasing the pressurized fluid out of the vessel. The release valve is operatively connected to the motor output shaft through a release valve actuator which responds to the reversal of the motor for opening the release valve and has a delay mechanism providing a delayed response action in opening the release valve so that the initiation of opening the release valve is inhibited until the output shaft rotates in the reverse direction through an angle of more than 180 degrees from the reversing point, thereby inhibiting an unintended opening of the release valve due to the reverse translation of the reciprocating motion of the pumping member because of kickback by pressurized fluid in the pump chamber when the motor is stopped.

Motor-driven fluid pump

A control apparatus of an automatic door is adapted such that a time period required for opening a door to a full-opened state is stored and a target time period required for opening the door to a half-opened state or to a 3/4-opened state is determined by evaluating the stored time period for opening the door to a full-opened state. In an operation mode for opening the door to a half-opened state or a 3/4-opened state, comparison is made of a lapse time period of the current operation for opening the door and the target time period is calculated, in advance whereupon a motor is brought to a stop upon coincidence thereof.

Growing community of inventors

Hikone, Japan

Koichi Ishino