Rope guide in the mast for several parts of a derrick boom which can be swivelled around the mast

摘要

A rope guide in the mast for several parts of a derrick boom, which derrick boom is linked to the mast and can be swivelled around the mast, by means of discs rotatable around the mast centre line or parallels thereto in planes at right angles thereto and guiding the parts is characterised in that the first rotary disc (2) carries the masthead tackle block (15), and the second rotary disc (6), rotatably mounted on the first rotary disc (2) or in the plane of the first rotary disc (2), carries deflection pulleys (7, 8, 9), pivotable about axes (17, 18, 19) parallel to the mast centre line (16), for the fetching parts (10, 11, 12) and interacts with stops (14) limiting its rotary movement and fixed to the mast. <IMAGE>