| 摘要 |
The invention concerns a lockable friction joint, in particular one intended to be set to a desired relative swing position between two sections of tube, in, for example, a gas extraction arrangement, a point suction arrangement, or similar, whereby the friction joint (20;70) comprises a first joint part (21;21') with a first arm part (22) or section of tube (22') and a second joint part (23;23') with a second arm part (24) or section of tube (24'). The first joint part (21;21') and the second joint part (23;23') each support a ring (25;25' and 26;26' respectively), which rings are provided with pusher dogs (27;27'). The friction joint (20;70) comprises two friction disks (30,31;30',31') provided with holes, each disk having means (32;32') to interact in a manner that transfers motion to the rings (25,26;25',26') that are provided with pusher dogs. A friction plate (35;35'), provided with a hole, is arranged between the said friction disks (30,31;30',31'). The friction disks are coupled in a manner that transfers motion with the ring (25,26;25',26'), that is provided with pusher dogs, that is located on the opposite side of the friction plate (35;35'), and the friction joint (20;70) is compressed with the aid of an adjustable tightening means (47;80).
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