A respiratory mask assembly includes a rigid mask frame with a rim portion including a rearwardly projecting tongue and lateral flange and a cushion having a rim with a corresponding groove and a rearwardly facing shoulder. A clip in the form of a collar passes over the cushion, engaging behind the
A respiratory mask assembly includes a rigid mask frame with a rim portion including a rearwardly projecting tongue and lateral flange and a cushion having a rim with a corresponding groove and a rearwardly facing shoulder. A clip in the form of a collar passes over the cushion, engaging behind the shoulder, and has one or more securing tabs that engage recesses in the flange.
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The invention claimed is: 1. A clip assembly for retaining a mask cushion to a mask frame, the clip assembly including a main body having a resilient detent movable between a first position in which the detent is relatively uncompressed and a second position in which the detent is relatively compre
The invention claimed is: 1. A clip assembly for retaining a mask cushion to a mask frame, the clip assembly including a main body having a resilient detent movable between a first position in which the detent is relatively uncompressed and a second position in which the detent is relatively compressed, whereby in the second position the detent is configured to be guided through a slot located on the frame, and, upon insertion, the detent is releasable so that the detent assumes the first position in which the detent is lockable relative to the slot of the frame, wherein the main body includes a hook adapted to be releasably engaged with a flange provided to the frame and allowing the clip assembly to pivot relative to the frame, the detent being adapted for engagement with the slot upon pivoting of the hook with respect to the frame. 2. A clip assembly as claimed in claim 1, wherein the main body has a generally triangular shape. 3. A clip as claimed in claim 1, wherein the hook and detent are formed as an integral one-piece unit. 4. A clip as claimed in claim 1, wherein the detent further includes at least one shoulder to engage with a first portion of the slot, and a tab to engage with a second portion of the slot. 5. A clip as claimed in claim 4, wherein the detent is configured for movement to the second position by displacement of the tab to unlock the detent from the slot. 6. A clip as claimed in claim 4, wherein the at least one shoulder includes two shoulders and the tab is provided between the two shoulders at a distal end of the detent. 7. A clip as claimed in claim 1, wherein the detent is substantially U-shaped. 8. A mask assembly comprising: a mask frame having a slot; a mask cushion provided to the frame; and a clip assembly for retaining the mask cushion to the mask frame, the clip assembly including a main body having a resilient detent movable between a first position in which the detent is relatively uncompressed and a second position in which the detent is relatively compressed, whereby in the second position the detent is configured to be guided through the slot, and, upon insertion, the detent is released such that the detent assumes the first position in which the detent is locked relative to the slot, wherein the main body has a hook adapted to be releasably engaged with the base side of the frame that allows the clip to pivot relative to the base side. 9. A mask assembly as claimed in claim 8, wherein the hook is open ended. 10. A mask assembly as claimed in claim 8, wherein the hook and detent are formed as an integral one-piece unit. 11. A mask assembly as claimed in claim 8, wherein the clip assembly is selectively engageable with the mask cushion. 12. A mask assembly as claimed in claim 8, wherein the slot is T-shaped and the detent includes two shoulder portions and a tab therebetween, the tab engaging with a leg of the T-shaped slot upon assembly of the clip assembly and the frame with the cushion therebetween. 13. A mask assembly as claimed in claim 12, wherein the tab extends from one side of the frame to another side of the frame when assembled. 14. A mask assembly as claimed in claim 8, wherein the main body is made of polycarbonate. 15. A clip assembly for retaining a mask cushion to a generally triangular mask frame having a base side, the clip assembly including a generally triangular shaped main body defining a base portion corresponding to a base portion of the frame and two side portions forming an apex, the main body including a hook provided to the base of the main body and adapted to be releasably engaged with the base side of the frame and allowing the clip to pivot relative to the base, the clip assembly further including a resilient detent having a distal end with a tab, a proximal end and a shoulder oriented to face generally towards the cushion and outward of the main body, the tab being configured to protrude through a slot located in the frame upon pivoting of the hook with respect to the frame so as to locate the shoulder against the frame. 16. A clip assembly as claimed in claim 15, wherein the hook is an open-ended hook. 17. A clip assembly as claimed in claim 15, wherein the main body is made of polycarbonate. 18. A clip assembly as claimed in claim 15, wherein the slot is T-shaped. 19. A respiratory mask assembly for delivering breathable gas to a patient, comprising: a substantially rigid mask frame defining a cavity with an opening and a rearwardly projecting member adjacent the opening; a flexible mask cushion to seal with the patient's face, said cushion having a recess to receive said rearwardly projecting member of the mask frame; and a clip member engaged with the mask cushion and having a plurality of securing tabs that engage with a plurality of recesses formed on the mask frame so as to retain the mask cushion on the mask frame. 20. The respiratory mask according to claim 19, wherein each of said securing tabs includes a resilient detent. 21. A respiratory mask assembly according to claim 19, wherein said mask cushion includes a nasal mask. 22. A respiratory mask assembly according to claim 19, wherein said mask assembly is a nasal mask, the clip has three of said tabs, and the mask frame comprises three of said recesses. 23. A nasal mask assembly comprising: a mask frame constructed from a substantially rigid material and including a plurality of recesses; a mask cushion constructed from a soft material and having a frame-engaging front side including a shoulder portion and a patient-contacting rear side; and a clip adapted to secure the cushion to the frame, wherein the clip includes a body portion engaged with the shoulder portion of the cushion such that the shoulder portion of the cushion is positioned between the clip and the mask frame, said clip including a plurality of tabs each adapted to releasably engage with a corresponding one of said recesses of the frame. 24. The nasal mask assembly of claim 23, further comprising a member projecting from the frame and into engagement with a recess formed on the cushion. 25. A clip assembly for retaining a mask cushion to a generally triangular mask frame having a base side, the clip assembly including a hook adapted to be releasably engaged with the base side of the frame and allowing the clip to pivot relative to the base, the clip assembly further including a resilient detent arrangement or tab adapted for engagement with a slot located in the frame upon pivoting of the hook with respect to the frame. 26. A clip as claimed in claim 25, further including a rear flange to engage a shoulder of a cushion. 27. A clip as claimed in claim 25, wherein the clip assembly is configured to be selectively engageable with the mask cushion. 28. A clip as claimed in claim 25, wherein the hook and detent arrangement or tab are formed as an integral one-piece unit.
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