| 摘要 |
<p>The door security system comprises a cylinder (3) provided with a rod (3a) which actuates the opening and closing movement of the door (11), a first opening sensor (1) and a second closing sensor (2), which when said sensors (1, 2) detect a value superior to a preset value reverses the direction of movement of the door (11), and means for preventing said reversal of the direction of movement of the door (11), and is characterized in that said means for preventing said reversal of direction of movement of the door (11) comprise a mounted sliding fitting (4) on the rod (3a) of said cylinder (3), a closing stop element (9) and an opening stop element (5), so that when said fitting (4) is in contact with the closing stop element (9) or the opening stop element (5), said first and second sensors (1, 2) are inhibited.</p><p><Paragraphs id="pa02" num="0002" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">It permits a very easy assembly, as the use of microswitches with wires and connections is not necessary.
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