Headgear with tension limit detection feature

Headgear for a patient interface, the headgear comprising:

• one or more straps each having a first end for connecting to a mask;
• wherein the first end of at least one of the one or more straps comprises:
• a connection portion, the connection portion being grippable by a user to pull the strap to increase a tension in the strap;
• a first rigid member;
• and
• a second rigid member that extends from a resilient carrier that is connected to the connection portion, the second rigid member being movable relative to the first rigid member when the connection portion is pulled by the user, wherein at least part of the second rigid member is arranged to strike the first rigid member to cause at least an audible alert when the second rigid member travels further than a threshold distance;
• wherein the resilient carrier is constructed and arranged such that the threshold distance corresponds to a desired tension limit for the strap, and wherein the resilient carrier is connected to the first rigid member via a rigid interface that is separate from the second rigid member.

Headgear for a patient interface, the headgear comprising:

• one or more straps each having a first end for connecting to a mask;
• wherein the first end of at least one of the one or more straps comprises:
• a connection portion, the connection portion being grippable by a user to pull the strap to increase a tension in the strap;
• a first rigid member;
• and
• a second rigid member that extends from a resilient carrier that is connected to the connection portion, the second rigid member being movable relative to the first rigid member when the connection portion is pulled by the user, wherein at least part of the second rigid member is arranged to strike the first rigid member to cause at least an audible alert when the second rigid member travels further than a threshold distance;
• wherein the resilient carrier is constructed and arranged such that the threshold distance corresponds to a desired tension limit for the strap, and wherein:
• the second rigid member is a C-clip and is at least partly embedded in the resilient carrier;
• and
• the resilient carrier is connected to the first rigid member via a rigid interface that is separate from the second rigid member.

Headgear for a patient interface, the headgear comprising:

• one or more straps each having a first end for connecting to a mask;
• wherein the first end of at least one of the one or more straps comprises:
• a connection portion, the connection portion being grippable by a user to pull the strap to increase a tension in the strap;
• a first rigid member;
• and
• a second rigid member that extends from a resilient carrier that is connected to the connection portion, the second rigid member being movable relative to the first rigid member when the connection portion is pulled by the user, wherein at least part of the second rigid member is arranged to strike the first rigid member to cause at least an audible alert when the second rigid member travels further than a threshold distance;
• wherein the resilient carrier is constructed and arranged such that the threshold distance corresponds to a desired tension limit for the strap and, wherein
• the first rigid member comprises a channel within which the second rigid member is slidingly movable;
• the resilient carrier is connected to the first rigid member via a rigid interface that is separate from the second rigid member;
• the second rigid member is movable between a deflected position and a relaxed position, and wherein when the second rigid member travels further than the threshold distance, the second rigid member moves from the deflected position to the relaxed position;
• and
• the second rigid member includes at least one protrusion and the first rigid member includes at least one projection, wherein contact between the at least one protrusion and the at least one projection is configured to cause the second rigid member to deflect.