| 摘要 |
The invention relates to a method for production of masts mainly formed of extruded bodies and with a general cross section comprising at least three mast elements ( 1,2 ) joined together at the corners ( 3 ) by means of cooperating rail sections ( 5 ) and channel sections ( 4 ). The channel section ( 4 ) are provided with tapered inner wall sections ( 4 A, 4 B) and the elements are joined by inserting the rail section ( 5 ) of a mast element ( 1,2 ) into the channel section ( 4 ) of an adjacent mast element ( 1,2 ), and clamped together by a substantial continuous movement of a roller like tool ( 11,12 ) in longitudinal direction and on the external side of each side of the channel section ( 4 ), causing permanent deformation of the walls of the channel section ( 4 ) around the rail section ( 5 ), thereby establishing a permanently joined corner ( 3 ).
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