| 摘要 |
<p>The support assembly comprises a base part (1) and an arm (2) arranged to rotate with respect to the base part (1) between high tension and low tension positions, and a tensioning device including a elastic element (6) arranged to bias the arm to said low tension position. A locking device includes a first protrusion (8) formed in an angled portion (13) of the base part (1) facing a peripheral wall (7) of a proximal end of the arm (2), a second protrusion (9) formed in an outer surface of said peripheral wall (7) close to said first protrusion (8) when the arm (2) is in the high tension position, and a retaining part (10) defining a stem (36) having grooves (11) to lock with said first and second protrusions (8, 9) when the retaining part (10) is inserted between said angled portion (13) and the peripheral wall (7).
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