| 摘要 |
<p>1,117,150. Grab buckets. L. PEDROLI and D. BRAGASTINI. 26 Nov., 1965 [30 Nov., 1964], No. 50397/65. Heading E1F. The structure of a grab bucket unit involves a hoist tackle-supported body to which vertically swingable arms are hinged, each arm being at the lower end pivotally connected to a vertically swingable bucket jaw and relative swinging of the jaws to the arms and the arms to the body is controlled by independently operable jacks positioned between the body and each arm and each arm and the associated jaw.</p> |
