| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 411387500 | Having distinct, spaced cutting edges or points (e.g., prongs) | 6 |
| 20080286072 | Screw - The invention concerns a screw, in particular a self-tapping screw, with a screw thread which reaches to the front end of the screw formed as a drilling tip. In the front area, starting with a distance from the front end of the screw, there is an opposite thread showing the same pitch as the screw thread, however, its thread height is lower than the thread height of the screw thread. This second, opposite single-thread, double-thread or triple-thread/multi-thread only reaches over the tapered drilling tip and leaves the shank of the screw free. It forms a cutting edge with its thread edge which is used to cut fibers in order to reduce wedge effect during screwing in the screw. The screw is particularly suitable for wood or wood-like materials in the edge areas of structural elements. | 11-20-2008 |
| 20090097941 | Self-drilling screw - A self-drilling screw ( | 04-16-2009 |
| 20090142160 | RAISED RECESS TRUSS HEAD SCREW - A truss screw is disclosed for use in fastening framing members together. In embodiments, the truss screw includes a raised recess section having walls extending from a top surface of the screw head. The raised recess sinks into the back surface of a workpiece fastened to the framing members so that the workpiece may sit flat against the workpiece. | 06-04-2009 |
| 20100061824 | SCREW - The present invention pertains to a screw essentially comprising a plurality of bulges disposed on threads of the screw and unengaged with a shank; whereby a consecutive extrusion path is formed between the bulges and the shank. Herein, while the bulges facilitate the screw threads to efficiently chop fibers of the object into debris and render the screw to easy drill into the object, the extrusion path smoothly guides and extrudes the debris therealong. Thus, the present invention conduces to decrease the drilling torque resulting in a speedily screwing; moreover, the bulges also allow the unsevered fibers hugging therearound to enhance the screw firmness inside the object. | 03-11-2010 |
| 20140064878 | SCREW - A screw includes a positioning member defined on inclined cutting planes of a drilling portion of the screw for allowing a cutting edge constructed at a convergence of the cutting planes to cut stably and efficiently. A main threaded section formed on a shank of the screw is extended to connect with one end of the cutting edge. The positioning member helps the screw fixedly stand on an object. The cutting edge and the cutting planes allow cutting debris to be swiftly and smoothly extruded therefrom into the main threaded section for avoiding the accumulation of considerable cutting debris. Thereby, the screwing resistance is reduced and the drilling speed is promoted. Preferably, the fastened screw is firmly sunk in the object, and the fastening operation is completed successfully. | 03-06-2014 |
| 20160001348 | Method for Producing Screws and Concrete Screw - A method for producing a concrete screw is disclosed. The lateral surface of the shaft includes, on the end of the shaft, at least one cut-out recess. A piece of rod is provided as a workpiece, at least one threaded coil is formed on the lateral surface in a thread rolling process in which two profiled rolling tools act on the workpiece, and at least one recess is formed in the lateral surface on an end area of the workpiece. The recess, when seen in the cross-section of the workpiece, is diametrically opposite an area of the workpiece free of recesses such that initially the recess is formed in the lateral surface and subsequently, the threaded coil is formed on the lateral surface of the workpiece, and at least one of the rolling tools also acts upon the end area with the recess during the thread rolling process. | 01-07-2016 |
