To arbitrarily vary bucket capacity by a method wherein bucket capacity set by a bucket body and an inner bucket is varied by revolving the inner bucket.
When through extension and retraction of a hydraulic cylinder 8 operated by a manually-operated valve 78, an inner bucket 6 is revolved within a bucket body 4, a displacement detecting means 52 of a capacity detecting means 50 detects a relative position between the body 4 and the inner bucket 6 as angular displacement and outputs a detecting result to a capacity computing means 56. The computing means 56 computes bucket capacity and outputs a computing result to a capacity display means 56. The capacity is displayed by a display means 56. Further, a capacity command means 72 converts the position of the inner bucket 6 to the body 4 into revolution angle displacement, which is outputted to an actuator control means 74. The control means 74 retracts the cylinder 8 through an actuator operating means 76 so that an actually detecting angular displacement is adjusted to commanded angular displacement. This constitution varies capacity to an arbitrary value.
HATAMURA ISAMU
YOSHIZUMI TOSHIYUKI
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