es ▁the ▁path ▁of ▁the ▁user ▁past ▁the ▁swing ▁side . ▁If ▁interrupted , ▁the ▁operator ▁assumes ▁that ▁a ▁person ▁has ▁crossed ▁into ▁the ▁swing ▁area , ▁and ▁it ▁is ▁not ▁safe ▁to ▁open ▁the ▁door ▁at ▁full ▁speed . ▁This ▁sensor ▁is ▁ignored ▁once ▁the ▁door ▁has ▁started ▁to ▁open , ▁as ▁then ▁the ▁operator ▁assumes ▁that ▁it ▁is ▁the ▁user ▁having ▁gone ▁through ▁the ▁door ▁that ▁has ▁interrupted ▁the ▁beam . ▁ ▁Open ing ▁techn ologies ▁ ▁The ▁majority ▁of ▁the ▁operators ▁open ▁the ▁door ▁directly ▁or ▁through ▁an ▁arm . ▁ ▁Over head ▁conce aled ▁mount ▁– ▁the ▁operator ▁is ▁mounted ▁above ▁the ▁door ▁and ▁rot ates ▁the ▁door ▁directly , ▁through ▁its ▁pivot . ▁ ▁Sur face ▁mount , ▁push ▁( sc iss or ▁arm ) ▁– ▁the ▁operator ▁is ▁mounted ▁on ▁the ▁wall ▁above ▁the ▁door , ▁on ▁the ▁approach ▁side ▁and ▁push es ▁the ▁door ▁with ▁a ▁link age ▁of ▁ 2 ▁arms . ▁ ▁Sur face ▁mount , ▁pull ▁( track ) ▁– ▁the ▁operator ▁is ▁mounted ▁on ▁the ▁wall ▁above ▁the ▁door , ▁on ▁the ▁swing ▁side ▁and ▁pull s ▁the ▁door ▁with ▁an ▁arm ▁whose ▁end ▁sl ides ▁in ▁a ▁track ▁mounted ▁on ▁the ▁door . ▁Under floor ▁conce aled ▁units ▁- ▁the ▁operator ▁is ▁mounted ▁within ▁the ▁floor ▁and ▁rot ates ▁the ▁door ▁directly , ▁through ▁its ▁pivot . ▁This ▁can ▁also ▁be ▁off - set ▁to ▁work ▁in ▁conj unction ▁with ▁door ▁h ing es ▁via ▁an ▁off - set ▁door ▁st