Patent ID: 11927040
Assignee: FILOBE CO., LTD.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 6:
7. The apparatus according to claim 5, characterized in that,
the concave contact surface (1510b) of the first vertical contact surfaces (1510a), (1510b) provided to the first vertical support (1510) is formed to contact the convex contact surface (1520b) of the second vertical contact surfaces (1520a) and (1520b) provided to the second vertical support 1520 in a door closed state, and
in an inflection section passing an inflection point at which a contact portion is changed from the concave contact surface (1510b) to the convex contact surface (1510a) in the first vertical contact surfaces (1510a), (1510b) provided to the first vertical support (1510), the inflection section is formed such that contact stress of the line contact portion is reduced due to an increase in a number of contact line as the contact portion is changed.