Abstract: In order to prevent wood fringes at the edge of a hole from a countersunk screw (1), the screw-head (2) is provided with a tapering underside and inclined milling-ribs with cavities between the milling-ribs on the tapering underside.

Abstract: The device comprises a combination of an inflatable air cushion member of a flexible but non-stretchable air tight sheet material and a support block. The inflatable air cushion member is formed as a bag unit comprising opposite layers of said sheet material provided face to face and joined along an edge area to form a double layer edge.

Abstract: The device comprises a plurality of inflatable air cushion members (6) of a flexible but non-stretchable air tight sheet material (1) in hose-connection (11) with an inflation tool (12). Each inflatable air cushion member (6) is formed as a bag unit comprising opposite layers of the sheet material (1, 1?) provided face to face and joined along an edge area (4) to form a double layer edge. Surface modification of the cushion members, for example by a sleeve or pouch into which the cushion members are inserted, is used to adjust the properties of the device for an optimized lifting process.

Abstract: A screw, especially for wood, has a knurled region (10) with two sets (11A, 11B) of ribs (11) that are offset from each other by an azimuth angle. For example, the two sets of ribs extend towards each other from opposite ends (10A, 10B) of the knurled region (10) and are intertwined only in an overlap region (12) that is at the middle of the knurled region.

Abstract: In order to prevent wood fringes at the edge of a hole from a countersunk screw (1), the screw-head (2) is provided with a tapering underside and inclined milling-ribs (8) on the tapering underside. Each milling-rib (8) has a planar front-side (15) delimited by smoothly curved convex milling-edge (17) for milling the material during countersinking of the screw-head (2).

Abstract: An auxiliary tool to be employed when positioning elements, such as window and door frames is described, in relation to an adjacent flat or plane, such as within wall openings, whereby the auxiliary tool comprises an inflatable air cushion member (6) which through a hose connection means (10) is connected to a pumping device (12) and a bleeding valve (16). The air cushion member is shaped as a flat bag unit. The auxiliary tool furthermore comprises connecting elements (42, 46, 48) for the mutual fixation of an air cushion member (6) comprising one or more adjacent air cushion members which have two or more mutually fixed air cushion members (6) which selectively are inflatable. These are in a side by side relationship provided positioned in a common plane so that in total the flat bag unit sides form opposing sides within the auxiliary tool.

Abstract: A screw and method for the mounting of boards/planks, in particular fiber cement planks, on a support of wood. The screw comprises milling wings and a first thread between the milling wings and the tip, and a second, larger thread with smaller pitch between the milling wings and the screw head.

Abstract: An auxiliary tool to be employed when positioning elements, such as window and door frames is described, in relation to an adjacent flat or plane, such as within wall openings, whereby the auxiliary tool comprises an inflatable air cushion member (6) which through a hose connection means (10) is connected to a pumping device (12) and a bleeding valve (16). The air cushion member is shaped as a flat bag unit. The auxiliary tool furthermore comprises connecting elements (42, 46, 48) for the mutual fixation of an air cushion member (6) comprising one or more adjacent air cushion members which have two or more mutually fixed air cushion members (6) which selectively are inflatable. These are in a side by side relationship provided positioned in a common plane so that in total the flat bag unit sides form opposing sides within the auxiliary tool.

Abstract: A corrugated sheet in a roof construction or wall construction is fastened to an underlying support structure by a screw extending through the sheet or wall construction and into the support structure. The screw includes a head, a washer, and a threading. The washer includes an upper metallic cap and an underlying sealant.