Twist locking connection for steam humidifier

A steam humidifier comprising:

• (i) a tank for containing water, the tank including a heater for heating the water to produce steam;
• (ii) a steam tube in fluid communication with the tank for transmitting steam from the tank to a duct;
• the steam tube having:
• (a) a proximal end that receives steam from the tank and a distal end that discharges steam to the duct;
• (b) a flange located nearer to the proximal end than to the distal end of the steam tube;
• and
• (c) a cylindrical outer surface between the flange and the proximal end of the steam tube, the cylindrical outer surface having a pair of locking tabs that project from the cylindrical outer surface;
• (iii) a steam tube receiver structure configured to receive the steam tube and to provide for fluid communication between the tank and the steam tube, the steam tube receiver structure having:
• (a) a cylindrical cavity with a face defining a bottom of the cylindrical cavity, the face having a first side facing away from the tank and a second side that is an opposite surface from the first side and faces into the tank;
• (b) a steam tube opening in the face, the steam tube opening being generally round and configured to receive the cylindrical outer surface of the steam tube, the steam tube opening further comprising a pair of notch openings configured to receive the locking tabs of the steam tube;
• and
• (c) ramp structures projecting from the second side of the face configured around the steam tube opening, the ramp structures defining an increasing distance from the first side of the face to the surface of the ramp structures with increasing angular distance from each of the notch openings;
• and
• (iv) wherein the steam tube is configured to be assembled to the steam tube receiver structure by inserting the cylindrical outer surface of the steam tube through the generally round opening portion and by inserting the pair of locking tabs of the steam tube through the pair of notch openings of the steam tube opening, the steam tube being further configured to be retained within the steam tube opening by rotating the steam tube to cause the locking tabs of the steam tube to travel along the ramp structures on the underside of the face and to pull the steam tube flange toward the first side of the face of the steam tube receiving structure.

A method of assembling a steam humidifier, the method comprising:

• (i) molding a steam tube in one molding step, the steam tube including one or more locking tabs;
• (ii) molding a steam tube receiver in one molding step, the steam tube receiver having an opening configured to receive the steam tube, where the opening has one or more ramp structures about the opening on a side facing the tank and one or more notch openings configured to receive the locking tabs of the steam tube;
• (iii) grasping the steam tube with a hand;
• (iv) orienting the one or more locking tabs of the steam tube with the one or more notch openings of the steam tube receiver structure and inserting the one or more locking tabs through the one or more notch openings;
• and
• (v) twisting the steam tube to cause the one or more locking tabs to engage with the steam tube receiver structure and to hold the steam tube to the steam tube receiver structure.

A steam humidifier comprising:

• (i) a tank for heating water to generate steam;
• (ii) a steam tube for transmitting steam from the tank to a duct, the steam tube having one or more locking tabs adjacent to an end and a flange adjacent to, but separated by a distance from, the one or more locking tabs;
• (iii) a steam tube receiver structure in fluid communication with the tank, the steam tube receiver structure having a face with an opening that is configured to receive the steam tube, the opening including one or more notch openings for receiving the one or more locking tabs of the steam tube;
• and
• (iv) wherein the steam tube is assembled to the steam tube receiver by inserting the steam tube through the opening in the steam tube receiver structure and the one or more locking tabs through the one or more notch openings, until the flange contacts the face, and rotating the steam tube.