| 摘要 |
A break bollard provided with a central post which is attached to a base plate which in its turn is secured to a stationary support construction by means of a screwed bolt construction with weakened region of incipient fracture, which is positioned between the screwed bolt head portion and a portion lying therebehind and arranged for engagement in rotary sense in case of fracture, thus ensuring, after fracture, an easy and rapid restoration to the original state. |
