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Hydraulic circuit

To perform boom-down operation by operating a boom cylinder (6) by an external load (W) while simultaneously operating an arm cylinder (26) or a bucket cylinder (27) in the state the bucket is off the ground, a first boom directional control valve (2) and a regeneration boom valve (13) are controlled to the neutral position and the open position respectively so that the hydraulic oil is regenerated from a line (9) located at the oil-returning side of the boom cylinder (6) through the regeneration boom valve (13) to a line (5) located at the oil-feeding side. Therefore, the volume of the hydraulic oil that can be supplied from the pressurized oil source (4) to the arm cylinder (26) or the bucket cylinder (27) via the second arm directional control valve (24) or the bucket directional control valve (25) is increased by the amount equivalent to the amount of the oil that is not supplied from the pressurized oil source (4) to the boom cylinder (6). As the circuit according to the invention enables the arm cylinder (26) or the bucket cylinder (27) to work faster, it increases the operating efficiency of the hydraulic excavator when its hydraulic actuators are operated simultaneously.
Owner:KEJTERPILLAR R L

Switching device including stopper surface-mounted on printed circuit board

A switching device includes a switch body, a side knob, a returning mechanism, and a stopper. The switch body has a controlling unit which can be tilted and depressed. The switch body is surface-mounted on the printed circuit board. The side knob is attached to the controlling unit of the switch body. The switch body includes the returning mechanism for the controlling unit. The stopper is actuated in accordance with the tilting or depression of the side knob. The stopper is surface-mounted on the printed circuit board.
Owner:ALPS ALPINE CO LTD
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