panic bar 90 an actuating mechanism 210 consists of an l shaped primary lever 212 having a long leg 214 with a distal end 216 and a short leg 218 with a distal end 220 the legs joining at junction 222 rollers 224 and 226 are attached between side arms 228 230 of the l shaped lever 212 at the distal end 216 of the long leg 214 by pins 232 233 placed in holes 234 236 of the lever with the rollers contacting an underside face 238 of control arm 54 a roller 240 is attached in similar fashion at the junction 222 and contacts an actuator lever 242 primary lever 212 is attached with a vertically oriented pin 244 through holes 246 in the lever near the distal end 220 of the short leg 218 and holes 248 in a primary lever bracket 250 thus allowing for pivotal motion of primary lever 212 primary lever bracket 250 rests on a mounting plate 252 and is attached to the mounting base 52 through holes in the mounting plate another function of primary lever bracket 250 is to support and provide a pivotal bearing means for an end of a dogging pin 254 this bearing means is provided by a tab 256 with hole 258 for the dogging pin 254 the tab 256 also has a projecting member 260 for hooking one end 262 of a dogging pin spring 264 the actuator lever 242 is a right angle 34 l 34 shaped part with two arms 266 268 extending one of which 268 has a convex shape at a distal end.