Two mattresses, of a same a different depth, share a same length and width. Each is in a shape of a rectangular prism and when placed one on top of the other, a larger rectangular prism is created. In order to hold the two mattresses in place when used together, a connector or connectors emanating from the sides or corners of each mattress are used. Such connectors can include hoop and loop fasteners, rings, hooks, lengths of fabric, and any combination thereof which hold the mattresses together in a taut manner.

A zip fastener (10) comprises two opposed sets of teeth (14) which are shaped such that those on one set (12a) can fit between those on the other set (12b). At least some adjacent teeth of opposed sets (12a, 12b) have facing surfaces (17a, 17b) shaped so as engage and to inhibit lateral separation of the sets, and such that each tooth can undergo at least limited angular movement relative to the adjacent tooth. The teeth (14) within a set (12) are held at a predetermined spacing along the set by linking strips (16) aligned generally along the center line of the set (12). Each tooth (14) defines a strip location (20) facing the opposed set of teeth, such that the linking strip (16) on one set (12a) fits in the strip location (20) on the other set (12b). Since the tooth spacing is set by the linking strips (16), the sets (12) of teeth (14) can lie on a curved path.

A zip fastener (10) comprises two opposed sets of teeth (14) which are shaped such that those on one set (12a) can fit between those on the other set (12b). At least some adjacent teeth of opposed sets (12a, 12b) have facing surfaces (17a, 17b) shaped so as engage and to inhibit lateral separation of the sets, and such that each tooth can undergo at least limited angular movement relative to the adjacent tooth. The teeth (14) within a set (12) are held at a predetermined spacing along the set by linking strips (16) aligned generally along the center line of the set (12). Each tooth (14) defines a strip location (20) facing the opposed set of teeth, such that the linking strip (16) on one set (12a) fits in the strip location (20) on the other set (12b). Since the tooth spacing is set by the linking strips (16), the sets (12) of teeth (14) can lie on a curved path.

Provided is a polyamide resin composition for a slide fastener that includes at least one polyamide resin and reinforcing fibers, wherein a total mass of the polyamide resin and the reinforcing fibers accounts for 90% by mass or more of the composition; wherein poly(m-xylylene adipamide) (MXD 6) accounts for 60% by mass or more of the polyamide resin; wherein reinforcing fibers account for 45 to 70% by mass of the total mass of the polyamide resin and the reinforcing fibers; wherein both first reinforcing fibers having a fiber diameter of from 5 to 7 m and second reinforcing fibers having a fiber diameter larger than that of the first reinforcing fibers by more than 2 m account for 90% by mass or more of the reinforcing fibers; and wherein the first reinforcing fibers account for 20% by mass or more and less than 50% by mass of the reinforcing fibers.

Devices and apparatus of adjusting curvature of a headband of a headset are disclosed. Some embodiments include a stiffening frame that is flat or arcuate. The apparatus can include a holder that attaches the frame to the headband. The frame and the holder interact with a headband of a headset to adjust curvature of the headband.

A lock for a zipper, the zipper comprising a chain and a slider, the chain being moveable to adopt an open and a closed configuration through movement of the slider with respect to the chain, the lock adapted to retain the slider with respect to the chain by abutting a surface of the slider.

A carrying box is releasably attachable to a portion of a piece of clothing. The carrying box has a top section connectable to a bottom section in a sealing manner. The bottom section has a curved bottom face with a curve radius substantially corresponding with the curve shape of a body part of a human being to be covered by the portion of piece of clothing. The carrying box further is arranged for releasable interconnection with said portion of piece of clothing by at least one attachment means, wherein at least one of a curved inward top face of the top section and the curved bottom face of the bottom section is arranged to carry a compress element.

A carrying box is releasably attachable to a portion of a piece of clothing. The carrying box has a top section connectable to a bottom section in a sealing manner. The bottom section has a curved bottom face with a curve radius substantially corresponding with the curve shape of a body part of a human being to be covered by the portion of piece of clothing. The carrying box further is arranged for releasable interconnection with said portion of piece of clothing by at least one attachment means, wherein at least one of a curved inward top face of the top section and the curved bottom face of the bottom section is arranged to carry a compress element.

The present disclosure is directed to a dock cart cover, including a lower portion, and a tensioning device. The lower portion is dimensioned to fit about the sides of the dock cart. The tensioning strap may selectively apply tension inward about the sides of the dock cart. The dock cart cover may include an upper portion which may be expanded upward from the lower portion. The dock cart cover may be attached to dock carts in either an expanded state or a collapsed state.

The present disclosure is directed to a dock cart cover, including a lower portion, and a tensioning device. The lower portion is dimensioned to fit about the sides of the dock cart. The tensioning strap may selectively apply tension inward about the sides of the dock cart. The dock cart cover may include an upper portion which may be expanded upward from the lower portion. The dock cart cover may be attached to dock carts in either an expanded state or a collapsed state.