Patent ID: 6955495

Claim:
A delimiter for use at airports comprising: a) an outer case, said outer case being installed below a ground surface; b) an inner post, positioned in said outer case such that said inner post can be raised and lowered within said outer case for use; c) a means for raising said inner post to a raised operating position, said means of raising said inner post including a handle formed on said inner post; and d) a means for shearing said inner post from said means for raising said inner post when said inner post is struck; e) a means for temporarily locking said inner post in said raised operating position including: i) a first plurality of protruding members, extending outwardly from said inner post; ii) a second plurality of protruding members, extending inwardly within said outer case; iii) whereby said inner post is positioned in said outer case such that the first plurality of protruding members is offset from said second set of protruding members while said inner post is being raised or lowered; and iv) whereby when said inner post is in the raised operating position, said inner post is rotated until said first set of protruding members is aligned with said second set of protruding members such that the second set of protruding members blocks a downward movement of said inner post.