Patent ID: 9249556
Filing Date: 2016-02-02
CPC Classification: E02F

Claim Text:
1. A shovel comprising: a lower running body; an upper turning body turnably mounted on the lower running body; an engine mounted to the upper turning body; a boom attached to the upper turning body; a boom cylinder configured to drive the boom; an arm attached to the boom; an arm cylinder configured to drive the arm; a bucket attached to the arm; a bucket cylinder configured to drive the bucket; a hydraulic pump connected to and driven by the engine and configured to supply a hydraulic oil to the boom cylinder, the arm cylinder and the bucket cylinder through a hydraulic line; a cabin provided in the upper turning body, the cabin including a roof and a seat therein to allow an operator to sit thereon; and a controller configured to decrease a speed of each of the boom, the arm and the bucket by reducing a horsepower of the hydraulic pump from a first horsepower to a second horsepower greater than zero so as to decrease an amount of the hydraulic oil supplied to the boom cylinder, the arm cylinder and the bucket cylinder upon determining that a position of the bucket is within a predetermined upper working range based on an output of a boom angle sensor while keeping the horsepower of the hydraulic pump at the first horsepower upon determining that the position of the bucket is out of the predetermined upper working range, the predetermined upper working range being an area above the cabin.