Patent ID: 6630877
Filing Date: 2003-10-07
Classification: E05C,Y10T

Abstract:
An electromagnetic device for restraining a hinged door leaf (8) in a closed position with a door frame (1), comprising:an electrically active part located in said door frame (1), comprising: two pole plates (2,3) each having a pole surface (18), said pole plates (2,3) being spaced apart by and connected to a yolk (6), wherein said pole plates (2,3) and yolk (6) are accommodated in a frame structure (4) mounted to a retaining plate (5) mounted to said doorframe (1); and a winding (7) wrapped circumferentially around said yolk (6) between said spaced apart pole plates (2,3) where upon an electrical current being supplied to said winding (7) said pole plates (2,3) produce an electromagnetic field; and a closing counterpiece located in said door leaf (8), comprising: a retaining plate (9) secured to said door leaf (8) and on which a framework (10) is attached; a return spring (12) provided in and connected to said framework (10); a slidable, substantially U-shaped counterpole piece (11) having two legs each of which has a counterpole surface (17), wherein said counterpole piece (11) is located within said framework (10) to define a recess and is connected to said return spring (12); an intermediate piece (13), within said recess, having a portion projecting beyond said counterpole surfaces (17) of said counterpole piece (11); wherein upon the production of said electromagnetic field, said counterpole surfaces (17) of said counterpole piece (11) are attracted to said pole surfaces (18) of said pole plates (2,3) and said counterpole piece (11) slides toward said electrically active part such that said projecting portion of said intermediate piece (13) engages in a free space (14) between said pole plates (2,3) when said door leaf (8) is in a closed position with said doorframe (1).