Abstract: A buckle includes a base that receives therein a pressing board having a front end pivotally coupled to the base and a rear end provided with a clutch portion for clutching a tooth of a head strap, and an operating member that is received in the base and corresponds to a back of the pressing board. The operating member has two buttons. When an arcuate bar pressing against the operating member is pressed inward, the arcuate bar deforms and pushes the pressing board to swing outward, making the clutch portion disengage from the tooth of the head strap, so that length adjustment of the head strap is allowed. After the adjustment, the pressing board automatically swings back due to the tension of the head strap, so that the clutch portion clutches another tooth of the head strap to position the head strap.

Abstract: A fastening buckle for fastening a snorkel to swimming goggles includes a strip-holding member and a snorkel-holding member. The strip-holding member has a resiliently depressible hanging section and has an outer surface formed with an inclined plane. The snorkel-holding member has a gripping portion laterally formed with a socket for receiving the hanging section of the strip-holding member. The socket has an outer wall formed with a cut-away section for abutting against a bottom edge of the hanging section. The socket further has a resiliently depressible pressing button extending downward from a top thereof to hang over the cut-away section and abut against the inclined plane of the hanging section. When pressed, the pressing button presses the inclined plane to expel the hanging section downward from the cut-away section, allowing convenient disengagement between the snorkel-holding member and the strip-holding member.

Abstract: The invention relates to a support apparatus for a front-mounted breathing tube, comprising a breathing tube inserted into a breathing tube positioning member, two ball-pivot portions arranged symmetrically on one side thereof, and a concave slot is formed between the two ball-pivot portions for swinging elastically; two forehead positioning members are arranged symmetrically and a head-band connecting portion is at the outer side thereof; the inner side includes a connecting portion having ball-socket portions for receiving the ball-pivot portions therein. With the ball-pivot portions on the breathing tube positioning member and with the ball-socket portions of the forehead positioning members, the forehead poisoning members can swing in different directions and angles.