The present invention provides a strap adjustment device for connecting with a body of a mask. The strap adjustment device comprises a female element, an elastic strap, and a regulating device. The female element is disposed on one side of the body of the mask and has an opening and a slot. The elastic strap has a male element and an adjusting end portion, which is opposite to the male element. The male element has a shape which is substantially corresponding to the female element. The regulating device is connected to the adjusting end portion. When the strap adjustment device is assembled with the body of the mask, the adjusting end portion passes through the opening and the slot before passing through the regulating device in an adjustable manner and being engaged in place by the regulating device. The male element is located in and positioned in the opening.

The present invention provides a strap adjustment device for connecting with a body of a mask. The strap adjustment device comprises a female element, an elastic strap, and a regulating device. The female element is disposed on one side of the body of the mask and has an opening and a slot. The elastic strap has a male element and an adjusting end portion, which is opposite to the male element. The male element has a shape which is substantially corresponding to the female element. The regulating device is connected to the adjusting end portion. When the strap adjustment device is assembled with the body of the mask, the adjusting end portion passes through the opening and the slot before passing through the regulating device in an adjustable manner and being engaged in place by the regulating device. The male element is located in and positioned in the opening.

An apparatus for fastening an end of a strap is provided. The apparatus comprises a workpiece, a first slit at a proximity of an edge of a first rectangle of the workpiece, a second slit at a proximity of an edge of a second rectangle of the workpiece opposite to first rectangle, a first fastening member affixed to a third rectangle of the workpiece perpendicular to the first and second rectangles, and a second fastening member affixed to a fourth rectangle of the workpiece opposite of the third rectangle. The fourth rectangle adapted to fold over so that the first fastening member and the second fastening member may engage to lock the strap. The strap may be inserted through the first slit and the second slit and its end held in position when the fastening members are engaged. In an embodiment, the strap is of a phylactery.

An apparatus for fastening an end of a strap is provided. The apparatus comprises a workpiece, a first slit at a proximity of an edge of a first rectangle of the workpiece, a second slit at a proximity of an edge of a second rectangle of the workpiece opposite to first rectangle, a first fastening member affixed to a third rectangle of the workpiece perpendicular to the first and second rectangles, and a second fastening member affixed to a fourth rectangle of the workpiece opposite of the third rectangle. The fourth rectangle adapted to fold over so that the first fastening member and the second fastening member may engage to lock the strap. The strap may be inserted through the first slit and the second slit and its end held in position when the fastening members are engaged. In an embodiment, the strap is of a phylactery.

A clip-on belt buckle, including a buckle part and a connecting part. A fixed end of a belt is fixedly connected to the connecting part. The buckle part comprises a buckle body, a first clamp plate and a second clamp plate. An upper end and a lower end of the buckle body are provided with an oblique hole, respectively. An upper part and a lower part of a back of the buckle body are provided with a sliding groove, respectively. Centers of an upper end and a lower end of the first plate are provided with an elongated hole along a front-and-back direction, respectively. A vertical shaft is provided at a middle of the second plate. Two ends of the vertical shaft extend through the elongated holes, and then extend through the oblique holes. A movable end of the belt is inserted between the first plate and the second plate.

A clip-on belt buckle, including a buckle part and a connecting part. A fixed end of a belt is fixedly connected to the connecting part. The buckle part comprises a buckle body, a first clamp plate and a second clamp plate. An upper end and a lower end of the buckle body are provided with an oblique hole, respectively. An upper part and a lower part of a back of the buckle body are provided with a sliding groove, respectively. Centers of an upper end and a lower end of the first plate are provided with an elongated hole along a front-and-back direction, respectively. A vertical shaft is provided at a middle of the second plate. Two ends of the vertical shaft extend through the elongated holes, and then extend through the oblique holes. A movable end of the belt is inserted between the first plate and the second plate.

A web-adjustment clamp includes a main body including a first lateral channel, a second lateral channel, a fold channel, and an exit channel. The first lateral channel, the second lateral channel, the fold channel, and the exit channel are configured to accept, have passed through, and retain a first webbing. The fold channel may be further configured to accept, have passed through, and retain a second webbing. In at least one embodiment, a locking door is pivotally coupled to the main body. The locking door is configured to be moved between an open position and a closed position. The first webbing is adjustable in relation to the web-adjustment clamp when the locking door is in the open position, and locked in place when the locking door is in the closed position.

A web-adjustment clamp includes a main body including a first lateral channel, a second lateral channel, a fold channel, and an exit channel. The first lateral channel, the second lateral channel, the fold channel, and the exit channel are configured to accept, have passed through, and retain a first webbing. The fold channel may be further configured to accept, have passed through, and retain a second webbing. In at least one embodiment, a locking door is pivotally coupled to the main body. The locking door is configured to be moved between an open position and a closed position. The first webbing is adjustable in relation to the web-adjustment clamp when the locking door is in the open position, and locked in place when the locking door is in the closed position.

A buckle can include a first strap engaging device and a second strap engaging device. The first strap engaging device can include a first engaging structure extending rearward from the front portion, with the first engaging structure defining a first hole through a first surface of the first engaging structure that faces outward in a first side direction from the buckle. The first engaging device can also include a buckle protrusion configured to press against a first strap end extending through the first hole to engage the first strap end without the buckle protrusion extending through the first strap end. The second engaging device can be configured to engage a second strap end. A technique can include securing first and second strap ends using a buckle, which can include engaging the first strap end using a buckle protrusion without the buckle protrusion extending through the first strap end.

The Belt Ratcheting Device with Hidden Blade-III (HB-III) facilitates unidirectional belt fastening and fast release. The HB-III includes a turning gate rotatably installed diagonally in a channel. The turning gate has a hidden sharp blade front which operates on the lower belt surface avoiding visible scratches. The turning gate is connected to a lever by a spring. The HB-III has two states: “active” and “inactive”. In the active state the device works as a belt ratchet i.e. allowing the belt to be pulled forwards but restricting any belt motion backwards. In the inactive state the ratcheting is disabled and the belt is released. The HB-III is controlled by the lever's position. After fastening, the belt remains fastened until the HB-III is switched manually into inactive state by moving the lever. The blade's smooth side and channel's smooth surfaces minimize belt wear.