Headgear assemblies and interface assemblies with headgear

A patient interface assembly comprising:

• an interface;
• a headgear assembly comprising:
• a rear headgear portion;
• and
• an interface coupling portion removably attachable to the interface;
• and
• a length or circumference adjusting portion interposed between the rear headgear portion and the interface coupling portion, the length or circumference adjusting portion comprising a pair of adjustment elements on each side of the headgear assembly, the pair of adjustment elements being coupled at one end to the rear headgear portion and at another end to the interface coupling portion;
• the interface coupling portion extending between at least two of the adjustment elements, and the length or circumference adjusting portion exhibiting an elastic force tending to contract a headgear length or a circumference length and a non-elastic lock force tending to inhibit elongation of the headgear length or the circumference length, and
• a pair of directional locks being associated with each one of the pair of adjustment elements, each of the directional locks being configured to provide a first resistance force in response to a force applied in a direction to elongate the headgear length or the circumference length and a second resistance force in response to a force applied in a direction tending to contract the headgear length or the circumference length, wherein the first resistance force is different from the second resistance force.

A patient interface assembly comprising:

• an interface;
• a headgear assembly comprising:
• a rear headgear portion;
• and
• an interface coupling portion removably attachable to the interface;
• and
• a length or circumference adjusting portion interposed between the rear headgear portion and the interface coupling portion, the length or circumference adjusting portion comprising a pair of adjustment elements on each side of the headgear assembly, the pair of adjustment elements being coupled at one end to the rear headgear portion and at another end to the interface coupling portion;
• the interface coupling portion extending between at least two of the adjustment elements, and the length or circumference adjusting portion exhibiting an elastic force tending to contract a headgear length or a circumference length and a non-elastic lock force tending to inhibit elongation of the headgear length or the circumference length and
• a pair of directional locks being associated with each one of the pair of adjustment elements, each of the directional locks being configured to selectively allow retraction of the headgear assembly or to lock the headgear assembly in a particular circumference and inhibit or prevent extension of the headgear assembly without manual interaction by a user.