A mounting device includes a base having an internal cavity, a top, and an open bottom in communication with the internal cavity. The device includes a first upper member above the base, wherein the first upper member extends upwardly from the base, and a second upper member is above the base, wherein the second upper member extends upwardly from the base. The device further includes a fastener opening formed though the base for receiving a fastener when the mounting device is secured to a roof. The fastener opening is in communication with the internal cavity.

An aluminum base composite material contains an aluminum polycrystal body being a polycrystal body of a plurality of aluminum base material phases partitioned by a grain boundary, a carbon nanotube part being formed of a carbon nanotube or an aggregate thereof and being dispersed in at least one aluminum base material phase, and an alumina part being formed of alumina and being dispersed in at least one aluminum base material phase. The carbon nanotube preferably has a sphere-equivalent diameter from 10 nm to 300 nm, and the number of the carbon nanotube part that is present in a cross-sectional area of 200 μm.sup.2 of the aluminum base composite material is preferably one or more.

An aluminum base composite material contains an aluminum polycrystal body being a polycrystal body of a plurality of aluminum base material phases partitioned by a grain boundary, a carbon nanotube part being formed of a carbon nanotube or an aggregate thereof and being dispersed in at least one aluminum base material phase, and an alumina part being formed of alumina and being dispersed in at least one aluminum base material phase. The carbon nanotube preferably has a sphere-equivalent diameter from 10 nm to 300 nm, and the number of the carbon nanotube part that is present in a cross-sectional area of 200 μm.sup.2 of the aluminum base composite material is preferably one or more.

A mounting device including a base having an internal cavity and an upper portion above the base. The upper portion extends upward from the base and includes a vertical member defining opposed first and second faces above the base. An aperture is formed through the upper portion and extends through the first and second faces. The base extends outward, beyond each of the first and second faces.

A method for covering a screw head of a screw which penetrates through a workpiece surface in a sealed manner by means of a viscous coating material is disclosed. The method includes the steps of applying a first strip of the viscous coating material onto the workpiece surface at a first inclination relative to the workpiece surface, the first strip of the viscous coating material, after having been applied, at most partially covering the screw head; and applying a second strip of the viscous coating material to the workpiece surface at a second inclination relative to the workpiece surface, the second strip of the viscous coating material, after having been applied, overlapping the first strip in such a way that the screw head is fully covered, the first inclination and the second inclination being opposite one another. The invention furthermore relates to an application system.

A method for covering a screw head of a screw which penetrates through a workpiece surface in a sealed manner by means of a viscous coating material is disclosed. The method includes the steps of applying a first strip of the viscous coating material onto the workpiece surface at a first inclination relative to the workpiece surface, the first strip of the viscous coating material, after having been applied, at most partially covering the screw head; and applying a second strip of the viscous coating material to the workpiece surface at a second inclination relative to the workpiece surface, the second strip of the viscous coating material, after having been applied, overlapping the first strip in such a way that the screw head is fully covered, the first inclination and the second inclination being opposite one another. The invention furthermore relates to an application system.

A mounting device including a base having an open bottom, a longitudinal axis, and a linear guide on the base. The linear guide guides support hardware in linear movement along the longitudinal axis. An internal cavity is under the base for containing a sealant against and in cooperation with a roof when the mounting device is secured to the roof. An opening is though the base is for receiving a fastener when the mounting device is secured to the roof. The opening is in communication with the internal cavity. The linear guide extends beyond the internal cavity.

A thermal insulating screw assembly includes a thermal insulating screw and a thermal insulating washer. The thermal insulating screw has a rotation head, a shank, and an external thread. A thermal insulating portion coats the rotation head and has a plurality of projections each of which is provided with a horizontal face, a vertical face, and an inclined face. The horizontal face is located at a top of each of the projections. The vertical face extends downward from the horizontal face. The inclined face extends inward and downward from the vertical face. The thermal insulating washer is positioned by the projections and has an axial hole which passes through the inclined face and the vertical face to the horizontal face, and is positioned on the horizontal face of each of the projections.

A releasable fastening device for boards, comprising an anchor configured for insertion between two adjacent boards and abutment with an underside of the boards. The releasable fastening device further comprises a rod in threaded connection with the anchor and a rotation element connected to the rod. The rotation element is configured for positioning on a topside of the boards and configured for being rotated by a user. The rotation element is configured for rotating the rod to thereby screw the anchor towards the rotation element.

An extendible protective element (10) for use in a child safety seat is disclosed. The extendible protective element comprises a first thread component comprising a first external thread and a first internal thread, and a second thread component comprising a second external thread, wherein the first thread component is rotatably connected to the second thread component via the first internal thread of the first thread component and the second external thread of the second thread component.