| 摘要 |
By means of an adjustable drum consisting of a tube (3) which is closed at one end by a membrane (1) which is fastened between a circular groove (13) on the outside and at the membrane end of the tube (3) and a fastening component (6) which fits the groove (13), the object is to realise an adjustable drum of the kind described by way of introduction, this being cylindrical, easy to handle for all users, and permitting an effortless, uniform tightening of the membrane combined with economy of manufacture. This object is realised according to the present invention by the fastening component (6) being non-elastic and during fixation of the membrane wholly recessed within the groove (13), and by the tube being provided on the side between the membrane end and the groove (13) with at least one additional circular groove (14), this constituting a part of a membrane (1) adjusting mechanism which further consists of a band (5) which fits the groove and from outside the membrane (1) presses the membrane into the groove (14), and a tensioning device connected with the band.
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