| 摘要 |
The device can slide along the shaft (13) of an umbrella, the shaft having at its opposite ends two annular grooves (14, 15) corresponding to the opened and closed positions of the umbrella. Said device comprises two sleeves (11, 12) which slide with respect to each other. A first sleeve (11) has a small locking ball (16), partially and automatically housed in one of said grooves. Said first sleeve also has a recess (17) in which the small ball can be moved radially, whereas the second sleeve (12) has a recess (21) which is capable of housing, even partially, said small locking ball when the device is in an unstable position between the opening and the closing of the umbrella. In this way any risk of jamming during the opening or closing of the umbrella is avoided. <IMAGE>
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