| 摘要 |
A trestle comprises two identical generally U-shaped members (2) of circular cross-section linked together, and means for limiting the opening angle between the linked members to a desired maximum value, the free ends (2b) of the side limbs (2a) of each member being bent towards each other through a right angle and housed side by side in the two ends of a tubular component (3) having substantially the same length as the middle portions (2c, 2'c) of the members (2) and an internal cross-sectional contour which embraces the external cross-sections of the linked pair of bent ends (2b) on the side branches (2a) of the two members (2), the ends of the tubular component (3) thus acting as linking bearings. <IMAGE> |
