| 摘要 |
A DEVICE (100) FOR CONTROLLING A DOOR (122), THE DEVICE (100) COMPRISING: A BODY (102); AN ELECTROMAGNET (104) ARRANGED TO GENERATE A MAGNETIC FIELD FOR RETAINING THE DOOR (122); A COUPLING MEANS (106) THAT COUPLES THE ELECTROMAGNET (104) TO THE BODY (102), THE COUPLING MEANS (106) BEING ARRANGED TO ALLOW A MOVEMENT OF THE ELECTROMAGNET (104) RELATIVE TO THE BODY (102); AND A CURRENT SUPPLY MEANS (108) THAT IS ARRANGED TO SUPPLY THE ELECTROMAGNET (104) WITH A CURRENT, THE CURRENT SUPPLY MEANS (108) BEING FURTHER ARRANGED TO DETECT THE MOVEMENT OF THE ELECTROMAGNET AND TO CEASE SUPPLYING THE CURRENT AT A PREDETERMINED INSTANT AFTER DETECTING THE MOVEMENT OF THE ELECTROMAGNET (104). |
