A compression indentation fastener device is described comprising a shank and a head. The head extends outwardly from an end of the shank in a transverse plane to define a head periphery. The head has an anterior side and a posterior side. The anterior side includes an exposed area extending between the shank and the head periphery. The anterior side includes a relief portion in the form of a depression. The relief portion is open at the anterior side of the head such that the relief portion receives a volume of substrate material when the exposed area of the head impacts the substrate material. The head may be integral with the shank or the head may be comprised of discrete head portions that mate with one another. Additionally, the head may be centered on the end of the shank or offset relative to the shank.

A drywall fastening button device may be provided that utilizes a retention button portion having an upper lip, a button portion and a retaining wall. The retaining wall may surround the button portion and the upper lip may be disposed at a top terminal end of the retaining wall. The retention button portion may utilize a nail element portion having a shaft portion, a plurality of back hooks and a pointed tip end. The shaft portion may extend from the retention button portion. The plurality of back hooks may extend outward from the shaft portion. The pointed tip end may be disposed at a bottom terminal end of the nail element portion.

A drywall fastening button device may be provided that utilizes a retention button portion having an upper lip, a button portion and a retaining wall. The retaining wall may surround the button portion and the upper lip may be disposed at a top terminal end of the retaining wall. The retention button portion may utilize a nail element portion having a shaft portion, a plurality of back hooks and a pointed tip end. The shaft portion may extend from the retention button portion. The plurality of back hooks may extend outward from the shaft portion. The pointed tip end may be disposed at a bottom terminal end of the nail element portion.

Fasteners for securing reinforcing structures, such as rebar, to road beds prior to laying the road material, such as concrete or asphalt. The fasteners are particularly suited for use when a geotextile fabric, or other underlayment, is present between the reinforcing structure and the road bed. The fasteners have at least one leg having an end and an opposite end, such as a self-centering end or a radiused end. In use, a fastener is positioned over a reinforcing structure with the leg(s) extending alongside the reinforcing structure and the radiused end extending over the structure. Applying force (e.g., percussive force) to the end, such as by pounding or hammering, will drive the fastener through the fabric and fasten the reinforcing structure to the fabric.

Fasteners for securing reinforcing structures, such as rebar, to road beds prior to laying the road material, such as concrete or asphalt. The fasteners are particularly suited for use when a geotextile fabric, or other underlayment, is present between the reinforcing structure and the road bed. The fasteners have at least one leg having an end and an opposite end, such as a self-centering end or a radiused end. In use, a fastener is positioned over a reinforcing structure with the leg(s) extending alongside the reinforcing structure and the radiused end extending over the structure. Applying force (e.g., percussive force) to the end, such as by pounding or hammering, will drive the fastener through the fabric and fasten the reinforcing structure to the fabric.

A connecting element, the use thereof and a method for connecting plate shaped workpieces are proposed. The connecting element comprises a multiplicity of closed encircling annular projections, which are arranged in such a way that the spacing between adjacent annular projections changes along a circumference or that adjacent annular projections are arranged parallel to one another or obliquely to the longitudinal axis. The connecting element is rotated and pressed into contact to produce a hole and, after the production of the hole, is subjected only to axial contact pressure and is then twisted to lock.

A connecting element, the use thereof and a method for connecting plate shaped workpieces are proposed. The connecting element comprises a multiplicity of closed encircling annular projections, which are arranged in such a way that the spacing between adjacent annular projections changes along a circumference or that adjacent annular projections are arranged parallel to one another or obliquely to the longitudinal axis. The connecting element is rotated and pressed into contact to produce a hole and, after the production of the hole, is subjected only to axial contact pressure and is then twisted to lock.

The invention relates to a dart (10) comprising a body, the body defining a chamber (24) having a plunger located therein to operatively deliver a substance through a hypodermic needle (32) extending through a front end of the body, and a retainer comprising a barb body locatable on the hypodermic needle (32) characterised in that the barb body is threaded. The invention further relates to a dart retainer, wherein the retainer comprises of a threaded barb body locatable on a hypodermic needle (32) of a dart (10).

An attachment means for connecting thin-walled roof or facade panels to a substructure has a shaft on one end region with a point and on the other end region with a head. A number of longitudinal grooves are provided on the shaft which extend parallel or substantially parallel to the central longitudinal axis X of the shaft. The head of the attachment means has a flat-head at a side of which facing the shaft a washer is formed, which radially protrudes outwards from the flat-head. A fine thread is formed on the shaft at least in some regions. Further the invention relates to a kit having such an attachment means and a sealing washer and a kit having such an attachment means and a sealing washer and a magazining-belt, respectively, and a method for connecting a thin-walled roof or facade panel to a substructure.

An attachment means for connecting thin-walled roof or facade panels to a substructure has a shaft on one end region with a point and on the other end region with a head. A number of longitudinal grooves are provided on the shaft which extend parallel or substantially parallel to the central longitudinal axis X of the shaft. The head of the attachment means has a flat-head at a side of which facing the shaft a washer is formed, which radially protrudes outwards from the flat-head. A fine thread is formed on the shaft at least in some regions. Further the invention relates to a kit having such an attachment means and a sealing washer and a kit having such an attachment means and a sealing washer and a magazining-belt, respectively, and a method for connecting a thin-walled roof or facade panel to a substructure.