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| Number | Title | Issue Date |
| 7377019 | Method and apparatus for fastening together structural components A method and apparatus for fastening a first relatively soft structural component such as a wood panel to a second relatively hard structural component such as a steel angle iron using fasteners each having a forward self-drilling portion, a rearward, self-tapping p... | 05/27/2008 |
| 7338243 | Thread-cutting screw A thread-cutting screw (1) serves for being screwed into the bore-hole wall (1a) of a bore-hole (1b). It comprises a substantially cylindrical core (2) of metal which has a central longitudinal axis (4), a thread (... | 03/04/2008 |
| 7290972 | Screw anchor for friable material A screw anchor includes a roughly cylindrical body (1) with a drilling portion (3) provided, at its free end, with drilling teeth (14-16), at the other end of the body, a bearing flange (5) and an external screw thread (7). ... | 11/06/2007 |
| 7214019 | Self-tapping screw A self-tapping screw having a boring part and a threaded shaft for fixing a panel-type object to a preferably metallic substructure is provided. The screw is configured in such a way that it produces a through hole in the panel type object, said hole accommodating t... | 05/08/2007 |
| 7140825 | Self tapping bolt A self tapping bolt which fastens a mounting member and a receiving member while the bolt cuts internal threads on an inner surface of a tap drill hole prepared in the receiving member. The bolt includes at least one groove formed near an end of a threaded portion o... | 11/28/2006 |
| 7070376 | Self-drilling, self-anchoring fastener for concrete A fastener adapted for anchoring into a masonry structure, such as a concrete block, employs an epoxy resin system so that the fastener is both mechanically engaged and bonded to the structure. In one preferred configuration, the bead is composed of a hardener, a re... | 07/04/2006 |
| 7063491 | Reverse barb system for screws and nails The reverse barb system for screws and nails includes fasteners that are barbed to prevent backing out once driven into a workpiece or construction material, such as wood. A screw with barbed threads has several barbed thread sections. Each barbed thread section is ... | 06/20/2006 |
| 6428259 | Self-drilling screw A flat headed screw structure includes a screw body having an axle face formed with an axially extended thread, and having a tail end provided with at least one cut groove. The cut groove has a top defining a cut groove opening. The cut groove opening fur... | 08/06/2002 |
| 6176664 | Fastening screw and method of forming same A fastening screw having an elongate shank (1), and a drilling tip (2) and a head (3) provided at respective opposite ends of the shank (1). The drilling tip (2) has a cutting edge (5) for cutting through metal and a flute (6) extending longitudinally of ... | 01/23/2001 |
| 6142719 | Self-drilling screw A self-drilling screw including a drilling section (1; 4) adjoining a thread section (2; 5) of the screw and formed of first (11; 41) and second (12; 42) parts arranged one after another, within the drilling section (1; 4) having first and second cutting ... | 11/07/2000 |
| 6120225 | Lamina-shaped borepiece for self-boring fastening elements A lamina-shaped borepiece (4) for a self-boring fastening element (1) is provided at its front side with cutting edges (5,6) flanked by grooves (7,8) that extend approximately parallel thereto. Indents (9,10) with set-back cutting edges (11,12) are provid... | 09/19/2000 |
| 5797914 | Bone screw A bone screw for use in oral, maxofacial, and cranial surgery. The bone screw includes a screw head and body portion. The body portion includes a body tip, the body portion having a single flute being recessed in the area of the body tip and by the area e... | 08/25/1998 |
| 5792142 | Cutting tip A new cutting tip and a very simple method for making the tip are given. The tip has no flutes but has a built-in chip clearance. It is self-drilling, self-tapping, and self-locating and can be positioned on a threaded or unthreaded member. When it is the... | 08/11/1998 |
| 5752792 | Anchor insert A self centering and drilling wall anchor having an outwardly threaded cylindrical body with a flanged proximal end and a cutting distal end. The distal end has a pointed tip at the long axis of said anchor and is formed with a flute extending from the po... | 05/19/1998 |
| 5520491 | Drill screw A drill screw of the type suitable for fastening a sheet or plate to a lightweight steel frame member comprises a head portion, a threaded portion adjacent the head portion, a drill shaft portion adjacent the threaded portion, a large diameter drill porti... | 05/28/1996 |
| 5171186 | Method of manufacture of a long point drill screw A method for forming a self-drilling screw. The self-drilling screw formed by this method stabilizes the screw during the hole drilling step of driving the screw and produces a precisely dimensioned hole for receiving the threaded portion of the screw. Th... | 12/15/1992 |
| 5120172 | Tapping screw A tapping screw has a threaded shaft and a stepped drill bit portion including two or more drill portions having different diameters gradually decreasing toward the tip of the screw. The small-diameter drill portion has a larger drill angle than the large... | 06/09/1992 |
| 5074729 | Drill screw having cutting edges each forming an arc curving to a head side A drill screw is composed of a drill portion on a tip of the drill screw, a threaded portion succeeding to the drill portion and a head succeeding to the threaded portion whereby a ridge on the threaded portion threads into an inside wall of a hole the dr... | 12/24/1991 |
| 4781506 | Self-drilling screw A self-drilling screw having a head at one end and a forged drilling end configuration at the other. The drilling end configuration comprises a pair of longitudinally extending flutes which are separated by land portions and which extend through a tapered... | 11/01/1988 |
| 4730969 | Self-drilling screw A self-drilling screw comprising a threaded shank having a head at one end and a forged drill bit at the other end, the drill bit including a pair of oppositely disposed intrusion faces and a pair of oppositely disposed axial flutes, a chisel edge formed ... | 03/15/1988 |
| 4725175 | Groove point screw A drilling and thread forming fastener is provided having a threaded shank and a pilot end. A pair of cutting surfaces are provided on the pilot end, each surface terminating in a cutting edge having a linear groove, arcuate in cross-section disposed adja... | 02/16/1988 |
| 4708557 | Drill screw There is disclosed herein a drill screw which comprises a threaded shank, a drilling portion formed at the forward end of the shank and a head formed at the rearward end of the shank and having a wrench head. The drilling portion includes a body extending... | 11/24/1987 |
| 4599024 | Entering end portion of drill screw A drill screw having an integral driving shank, head, and entering end portion. The shank has formed on it thread convolutions of uniform outer and root diameters. The entering end portion has a cylindrical portion coaxial with the shank provided with two... | 07/08/1986 |
| 4586862 | Drilling screw Drilling screw comprising a threaded shank and a drill section extending axially from the shank and having a plurality of vertical flat walls, parallel edges and inclined edges formed on the vertical flat walls, protrudent blocks formed respectively by th... | 05/06/1986 |
| 4568229 | Drill tip and fastener employing same A drill screw having primary and secondary cutting edges on opposite sides of its longitudinal axis, with the primary cutting edge offset so that it contacts the work-piece first, at a position displaced laterally from the screw axis, and produces initial... | 02/04/1986 |
| 4323326 | Self-drilling screw A self-drilling screw having a single screw thread or a plurality of screw threads of the same angle and height, wherein at least one cutting edge of a drill shape is formed by form rolling at an end face of a forward end of the screw thread at a tapering... | 04/06/1982 |
| 4295768 | Chip breaker screws A drilling and thread forming screw is provided with means for breaking the chips produced during the drilling process. An obstruction in the form of a truncated cylindrical element having its flat end portion substantially facing the cutting edge of the ... | 10/20/1981 |
| 4241639 | Method and apparatus for producing drill screws The method includes positioning a plurality of rotary milling saw stations about a path of travel for successive screw blanks. Two longitudinally overlapping fluting cuts are made on each side of each blank to configure a drilling point. The blanks are ro... | 12/30/1980 |
| 4222689 | Drilling and tapping screw A screw having drilling, tapping and fastening functions at the same time comprises a slender shank having a tool receiving head formed at the rear end of the shank, a drill portion integral with the front end of the shank and a helical cutting screw thre... | 09/16/1980 |
| 4192217 | Self-drilling screw A self-drilling screw having an elongated threaded shank with a driving head at one end and a drilling body portion at its other end formed with longitudinally extending flutes located substantially on opposite sides of the body, these flutes defining rec... | 03/11/1980 |
| 4147088 | Drill screw A drill screw comprising a threaded fastener with a drill bit formed on its entering end, the drill bit characterized by a bi-arc cross-section, that is the shape which is shared by two partially overlapping circles. Also disclosed are novel pinch point d... | 04/03/1979 |
| 4136597 | Drill screw and die for producing same A drill screw is produced by a pinch pointing die comprising a pair of substantially identical drill point forming portions each of which includes a half conical recess, a half cylindrical recess and a half truncated conical recess. The drill screw thus p... | 01/30/1979 |
| 4125050 | Self-drilling screw A self-drilling screw having an elongated threaded shank with a driving head at one end and a drilling body portion at its other end formed with longitudinally extending flutes located substantially on opposite sides of the body, these flutes defining rec... | 11/14/1978 |
| 4114508 | Self-drilling screw A drill embodied in a self-drilling and self-tapping screw has a drill-point comprising a first sharp-pointed tip on the drill axis and a second sharp-pointed tip offset transversely of and axially behind the first tip. First and second cutting edges are ... | 09/19/1978 |
| 4064784 | Drill tip and threaded fastener A drill tip formed from two elements, each being one-half of a concave-convex spade-like element, the elements being joined integrally, the elements presenting a cutting edge which is a continuous curve extending from one side of the tip to the other thro... | 12/27/1977 |
| 4016795 | Self-drilling screws A self-drilling and self-tapping fastener, particularly suitable for use in relatively thick metal, which is made from a headed blank by a method including pressing into the cylindrical free end of the blank a pair of straight flutes, by dies which are cl... | 04/12/1977 |
