WORKING DEVICE OF CONSTRUCTION EQUIPMENT WITH ATTACHMENT SELF LEVELING FUNCTION

摘要

PROBLEM TO BE SOLVED: To keep an angle to a ground surface constant until an attachment is lifted from an initial position to an uppermost position without separate operation by installing the first extension-shrinkage mechanism, the second extension-shrinkage mechanism and the second linkage member. ;SOLUTION: When an arm cylinder 6 is extended, an arm 2 is rotated in the direction that the arm is lifted from a ground surface to a frame 1 centering around a connecting pin 4. Another end of the second linkage member 13, to which one end of a connecting pin 8 is connected pivotally, is turned in the counterclockwise direction centering around the connecting pin 8 at that time. The angle of the position of a connecting pin 11, to which another end of the second linkage member 13 is connected pivotally, is changed in the counterclockwise direction (the direction separated from the frame) at that time. One end of a bucket cylinder 9 is pushed by the positional conversion, and the absolute angle of the bucket 3 coupled at another end is converted in the counterclockwise direction. Consequently, even when the arm 2 is lifted, the bucket 3 is automatically kept level. Accordingly, a hydraulic cylinder can be shortened, the weight of the working device is reduced and operating efficiency can be improved.;COPYRIGHT: (C)1996,JPO