| 摘要 |
The helmet (1) has central segments (106, 107) connected to each other by a sliding connection ensuring a sliding motion. The segments are formed of notches and complementary and parallel projections. The projections of each segment are connected to each other by a transverse bar. The transverse bars are located at ends of the projections. Ends of the transverse bars extending beyond the projections are guided in the displacement by guidance elements placed along the notches. |
