Abstract: An adjustable headboard device includes a mattress panel which can be positioned beneath the mattress and a headboard hingedly coupled to the mattress panel for retaining pillows at a preferred orientation for user's sleeping position. A plurality of brackets is each attached to a respective one of the mattress panel and the headboard and a pair of arms is each pivotally attached to the brackets which are attached to the headboard. Each of the pair of arms has a plurality of engagement points and a respective engagement point on each arm is attachable to a respective one of the brackets which are attached to the mattress panel thereby retaining the headboard at an adjustable angle with respect to the mattress panel.

Abstract: A multi-stage system includes a block defining a cylinder, the cylinder comprising an inlet thereto and an outlet therefrom and a linear grove disposed axially within the cylinder, an infinity; a power transfer shaft configured for rotation within the cylinder, the power transfer shaft comprising a shaft portion and an infinity portion, the infinity portion defining an infinity profile; and a piston configured to reciprocate within the cylinder, the piston defining a first compression chamber and a second compression chamber within the cylinder, the piston slidably engaging the infinity profile of the power transfer shaft.

Abstract: An adjustable headboard device includes a mattress panel which can be positioned beneath the mattress and a headboard hingedly coupled to the mattress panel for retaining pillows at a preferred orientation for user's sleeping position. A plurality of brackets is each attached to a respective one of the mattress panel and the headboard and a pair of arms is each pivotally attached to the brackets which are attached to the headboard. Each of the pair of arms has a plurality of engagement points and a respective engagement point on each arm is attachable to a respective one of the brackets which are attached to the mattress panel thereby retaining the headboard at an adjustable angle with respect to the mattress panel.

Abstract: In one embodiment, a system includes at least one disc changer to store media content, and multiple user devices coupled to the disc changer. At least a portion of the media content has copyright protection. The multiple user devices share the media content of the disc changer without violating the copyright protection of the media content.