Class / Patent application number | Description | Number of patent applications / Date published |
411387600 | Resembling a twist-drill-type bit | 12 |
20090214321 | SELF-DRILLING SCREW AND METHOD OF MAKING THE SAME - A self-drilling screw includes a head portion, a shank portion having an externally threaded section, and a drilling portion opposite to the head portion. The drilling portion has a main section and a tip section, two flutes extending helically through the main and tip sections, and two lands extending helically between the flutes. Each of the lands has a tapered face extending in the tip section and between the flutes, and a drilling edge formed on one end of the tapered face. | 08-27-2009 |
20150322989 | CRACK-PROOF SCREW - A crack-proof screw comprises a head; a rod having a first end extending from the head and having a rod thread near the head and expanding threads far away from the head; each expanding thread encircled through an angle smaller than 360 degrees; the screwing direction of the expanding thread being identical to or different from that of the rod thread; a tapered tail extending from a second end of the head; the expanding threads on the rod being near the tapered tail; the tapered tail having two drilling threads; each drilling thread can be extended to or not extended to the tip end of the tapered tail. | 11-12-2015 |
20160003282 | Method for Producing a Concrete Screw - A method for producing a concrete screw is disclosed. The method includes providing a wire piece as a workpiece, forming a thread helix on a lateral surface of the workpiece, and providing a depression in the lateral surface of the workpiece by a forming process. | 01-07-2016 |
411387700 | Cuttings or chips moved along curved relief channel | 3 |
20110280684 | SELF-DRILLING SCREW AND FABRICATING METHOD FOR THE SAME - A fabricating method for the self-drilling screw has acts of forming a main section and a secondary section by punching, forming a flat drilling blade with a tapered end at a bottom end of the small diameter portion by punching, and forming a thread portion on an outer surface of the main section and a chip removal thread portion with a spiral chip removal groove on an outer surface of the secondary section by rolling. The self-drilling screw utilizes the flat drilling blade with the tapered end and the chip removal section having chip removal function to reduce the size of the drilling blade. Therefore, the self-drilling screw reduces the size of the punching die, lowers the punching force, lowers both the load of the punching die and the load of the punching machine, and lowers both the die cost and the manufacturing cost. | 11-17-2011 |
20140023455 | FASTENER WITH DRILL PILOT AND REVERSED THREADED REGIONS - A fastener includes a shank having a pilot section and a threaded section. The pilot section includes a cutting tip and a drill section; the threaded section includes a first thread region having the same twist as the drill section and a reverse thread region. A helical ridge may be provided in the reverse thread region. A head at the second end includes a top portion such as a disk and an undercut region. | 01-23-2014 |
20150316088 | SCREWCON - A self-drilling and self-tapping anchoring screw for attachment to a concrete substrate formed from hardened steel or the like suitable material, and having a threaded proximal portion including a radially enlarged head and a coaxial distal portion, forming a concrete drill bit having a fluted shank and a concrete drill bit tip, said threaded proximal portion including a double lead, spaced thread configuration including a first thread helix of a given height and a second thread helix of a smaller height than said first thread helix; said first and second thread helix defining a space therebetween which serves as a reservoir to receive dust that is produced during the tapping operation and wherein said fluted shank functions to eject any particulates created during a drilling operation thereby enabling the threaded proximal portion to form an effective threaded connection with the concrete substrate during said tapping operation. | 11-05-2015 |
411387800 | And specified cutting edge, face, rake, relief surface, or flute angle (e.g., axially facing facets) | 6 |
20090232619 | Self-drilling screw - A self-drilling screw ( | 09-17-2009 |
20090269163 | SELF-TAPPING SCREW - A self-tapping screw comprises a self-tapping screw having a screw rod; one end of the screw rod being a head and another end thereof being a drilling head; the drilling head having two extending surfaces which are symmetrical; each extending surface being formed with a cutting teeth set; each cutting teeth set having a plurality of cutting teeth; each extending surface extending from a tip of the drilling head and having an approximate sector area; a notch being formed between each two adjacent radial edges of the two extending surfaces. Each cutting tooth is protruded from the extending surface. | 10-29-2009 |
20100119327 | SELF-DRILLING SCREW WITH MULTI-DRILLING PORTIONS - A self-drilling screw with multi-drilling portions mainly comprises a shank, a head and a drilling portion separately disposed on both ends of the shank, and a thread section spiraled on the shank. Wherein, at least one sub-drilling portion formed amid the drilling portion and the thread section further defines a sequence of indentations and prominent areas, and each indentation generates a cutting surface outwardly extended from one side thereof so as to converge the cutting surface with the adjacent prominent area at a cutting ridge. Accordingly, the application of the cutting ridges and the indentations facilitates the drilling portion with the chipping capability and renders an appropriate guidance to redundant debris, thereby efficiently achieving a swift screwing and the lowered screwing resistance to promote the screwing efficiency. | 05-13-2010 |
20130089390 | STRUCTURE OF SELF-DRILLING SCREW - A self-drilling screw includes a head having a circumferential surface around which a helical thread is formed and a body mounted to the head. The body has an end forming a cylindrical chisel tip section, which forms a conic surface facing outward. Two chip discharging channels are formed in the chisel tip section, and each chip discharging channels forms an external cutting edge at a connection thereof with the conic surface. The conic surface and the external cutting edges have a connection interface therebetween in which an inverted V-shaped notch is formed. The notch has two sides each forming an internal cutting edge. The notch forms two sharp points with respect to the external cutting edges, whereby the two sharp points are each associated with the respective external cutting edge and the respective internal cutting edge. Each of the sharp points forms an included angle, which ranges between 15°-135°. | 04-11-2013 |
20150147137 | SCREW FOR COUPLING WOODEN MEMBERS TOGETHER - There is provided a screw for fastening a wooden member which includes: a shank that extends along a datum line; a head that is disposed at an end of the shank and has a plate portion having a cross-section that narrows as it goes to the shank such that the boundary of the cross-section and the datum line make a plate angle; and a tapered blade that protrudes from the outer side of the plate portion, has a bottom perpendicular to the datum line and a side making an obtuse angle with the bottom, and has a taper angle that is made by the side and the datum line and is 2.50° to 12.5° smaller than the plate angle. | 05-28-2015 |
20160032956 | FASTENING BOLT FOR USE IN CONCRETE - A fastening bolt includes a shaft defining a central axis, a head, a drilling portion, and first threads alternating with second threads. The first threads and the second threads have different outer diameters. Each first thread has a trailing surface facing the head and inclined to a line perpendicular to the central axis by a trailing angle and a leading surface facing the drilling portion and inclined to the line by a leading angle. The trailing angle is smaller than the leading angle to build an asymmetrical form. Some threads near the drilling portion form respective cutting grooves and recesses thereon. Each cutting groove is formed by walls with different lengths and opened at an angle which does not exceed 90 degrees. The bolt breaks the workpiece quickly by the cutting grooves and recesses. The asymmetrical first threads help enter the workpiece quickly and attain a firm engagement therewith. | 02-04-2016 |