| 摘要 |
A security system controls two sliding (or other) doors 6 and 7 to allow only one door to be opened at a time. A pivoted bolt 13 is pushed by a mechanical link 16 into the opening-path of the door 6 when a lever 15 that abuts the leading-edge of the other door 7 pivots back upon opening movement of that door. A corresponding mechanism includes a link 26 which couples a pivoted bolt 23 to a lever 25 that abuts the door 6, such that the bolt 23 blocks opening of the door 7 when the door 6 begins to open. The mechanical links 16 and 26 may be replaced by hydraulic links.
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