degrees the axis a 2 and the second center point 122 form an angle 136 that is between about 3 and about 5 degrees that is if a first line 140 is drawn from a point on the second stop surface 102 to the axis a 2 and a second line 142 is drawn from the point on the second stop surface 102 to the second center point 122 the first and second lines 140 142 will form an angle 136 therebetween that is between about 3 and about 5 degrees in the embodiment depicted the angle 136 is 3 908 degrees referring to fig1 4 5 and 7 insulating members 143 separate the coil 54 from other components including the core 58 the rod 49 which is mounted to the frame 34 supports the insulating members 143 and the coil 54 via brackets 144 a torsion spring 148 is coiled around the rod 49 and operatively interconnects the second lock member 46 and the frame 34 such that the spring 148 biases the second lock member 46 toward its locked position other torsion springs 152 operatively interconnect the frame 34 and the base portion 14 such that the torsion springs 152 bias the head restraint 30 toward its folded position accordingly when the head restraint 30 is in the upright position and the electromagnet 50 is not energized as shown in fig4 the spring 148 maintains the second lock member 46 in the locked.