Flush bolt

A flush bolt comprising:

• a bolt head and a strike, the bolt head moving out of the flush bolt in response to movement of the strike into the flush bolt, through a movable cam surface in the flush bolt,
• wherein the bolt head is part of a bolt assembly, and the strike is part of a strike assembly,
• wherein the movable cam surface is part of the strike assembly, and
• wherein the bolt assembly further includes,
• a housing, the bolt head being movable at least partially into and out of the housing,
• a back plate at an outer end of the housing,
• a first spring, one end of the first spring pressing against the back plate, the other end of the first spring pressing against a lip at an end of the bolt head, the first spring generating a spring force which withdraws the bolt head into the bolt assembly in the absence of other forces,
• a plunger in a cavity in the bolt head, the plunger extending through an opening in the bolt assembly adjacent the lip of the bolt head, and into the strike assembly, the plunger engaging the cam surface, and
• a second spring in the cavity in the bolt head, the second spring extending between the end of the bolt head adjacent the back plate and the plunger, the second spring generating a spring force that presses the plunger partially out of the bolt assembly and into the strike assembly,
• wherein the spring force generated by the second spring is less than the spring force of the first spring when the plunger is released, but the force of the second spring is greater than the force of the first spring when the plunger is pressed sufficiently far into the bolt head by the cam surface.