Maxell Izumi Co., Ltd.

Izumi Products Company

Keiichiro Kamijo

Katsutoshi Kochiyama

An electric tool is configured that oil pressure can be rapidly increased while suppressing the load on a motor. The electric tool includes a main body in which a cylinder part, a hydraulic pump for feeding hydraulic oil to the cylinder part and an electric motor are disposed, and a tool head operated by a pressing force of a piston in the cylinder part. The hydraulic pump has a swash plate cam, a first plunger, a second plunger, a check valve and a relief valve, and until the pressure reaches the first pressure, a first liquid feeding amount of the first plunger is increased than a second liquid feeding amount of the second plunger.

Electric tool

There is provided a compact, lightweight, hydraulic electric tool which can perform a long-term operation by minimizing power consumption while preventing operation efficiency from being degraded due to a hot electric motor. An electric tool includes a main body having an oil tank, a hydraulic pump for feeding hydraulic oil to a cylinder part, and an electric motor for driving the hydraulic pump, and a tool head operated by a pressing force of a piston in the cylinder part in a state where the tool head is coupled to the main body. The oil tank is configured to cover a motor case.

An electric tool () includes piston () reciprocably housed in cylinder () provided in main body portion () and be pushed by a pressure of fluid; tool head () coupled to a distal end of the main body portion and performing a predetermined operation by being pushed by the piston; return channel () communicating from the cylinder to a fluid tank to allow the fluid to flow therethrough; pressure regulating valve () disposed in operational flow channel () branching from the return channel and taking an open position when the pressure of the fluid in the return channel becomes equal to or higher than a predetermined value; operating pin () disposed in the operational flow channel and pushed by the pressure of the fluid flowing therein; and return valve () disposed in the return channel and taking an open position by being pushed by the operating pin.

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Matsumoto, Japan

Keiichiro Kamijo