| 摘要 |
PCT No. PCT/SE88/00635 Sec. 371 Date Sep. 13, 1989 Sec. 102(e) Date Sep. 13, 1989 PCT Filed Nov. 23, 1988 PCT Pub. No. WO89/06216 PCT Pub. Date Jul. 13, 1989.A rotator for crane-mounted working implements comprises a housing (7) swingably connectible with the tip of the crane via a joint, and a pivot shaft (8) connectible with the working implement and pivotal relative to said housing by means of at least one vane or flap (10) operating in a chamber and dividing said chamber into two operating chambers which can be supplied with, or evacuated of, hydraulic medium via two first ducts (12) provided in said housing, said pivot shaft including second hydraulic medium through-ducts (17, 17') opening into annular hollow spaces (16, 16') in a swivel connection (15) incorporated in said housing. Between said first ducts (12) in the housing and the annular hollow spaces (16, 16') of the swivel connection (15), branch ducts (20) are provided for establishing communication between said first and said second ducts (12, 17) for supplying hydraulic medium to the rotator working chambers via said shaft (8), thereby eliminating the need for any hydraulic medium connection on the outside of the rotator housing. |
