of the shaft 12 and the magnets are positioned so that rotation of the wings will always terminate in a quarter point position the controller 48 receives power from an electric box 56 on one of the rails 36 a handicap pushbutton switch 58 is disposed adjacent the opening 26 and exit 28 the switch 58 is coupled to the controller to cause the running speed of the motor 46 to be reduced when actuated a motion detector 60 such as a microwave detector is disposed on the facia 34 adjacent the entry 26 to sense the presence of a person in the region of the entry 26 an example of a suitable detector is that of model d7 provided by microwave sensors of ann arbor mich typically the detector defines a region whereby the movement of an object within the general confines of the defined region alters a very low power broad microwave beam which senses the movement and actuates a relay although card readers etc can also be used with particular reference to fig1 and 4 a drum edge switch 62 is disposed along the vertical edges 64 of the curved panels 20 22 the drum edge switches 62 sense physical interference between the drum edge 64 and the wings 14 such as a human limb or object the drum edge switches 62 comprise a curved rubber extrusion 66 vertically disposed along the panel edge and joined to a wooden support block 68 adjacent the vertical edge of the curved panels 20 22 a pair of narrow vertically disposed longitudinal metal plates 70 separated by an apertured thin typically less than 2 mm rubber strip 72 are glued with a silicone.