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Confirmat Screw
Confirmat screws or cabinet-connecting screws are screws designed to hold in particleboard, medium-density fiberboard, and similar materials. They are very common furniture screw, in furniture assembly, but are rare in retail. They may have flat or barrel heads. They have blunt tips, large shanks, and often a shoulder, a broad length of unthreaded shank just below the head, which helps hold the screw in position. They have coarse threads, rather like masonry screws (which may match them exactly in thread). Confirmat screws are usually screwed into stepped, predrilled holes, often drilled with a stepped bit. Short, shoulderless confirmat screws, whose heads pass through hardware like hinges or drawer slides, may go into unstepped holes. As they are screwed in, confirmat screws self-tapping screw, compress a thread (the spiral groove) into the particle board. They do not cut new threads if removed and re-inserted. A confirmat screw can therefore be removed and replaced dozens of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Screw And Bolt Types
This is a list of types of threaded fasteners, including both screws and bolt (fastener), bolts. __TOC__ Fasteners with a tapered shank Fasteners with a non-tapered shank References Bibliography * * * {{Citation , last1 = Oberg , first1 = Erik , last2 = Jones , first2 = Franklin D. , last3 = Horton , first3 = Holbrook L. , last4 = Ryffel , first4 = Henry H. , title = Machinery's Handbook , place = New York , publisher = Industrial Press Inc. , year = 2000 , edition = 26th , isbn = 0-8311-2635-3 , postscript =. Screws Threaded fasteners ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patent Expiry
The term of a patent is the maximum time during which it can be maintained in force. It is usually expressed in a number of years either starting from the filing date of the patent application or from the date of grant of the patent. In most patent laws, annuities or maintenance fees have to be regularly paid in order to keep the patent in force. Thus, a patent may lapse before its term if a renewal fee is not paid in due time. International harmonization Significant international harmonization of patent term across national laws was provided in the 1990s by the implementation of the WTO's Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPs Agreement). Article 33 of the TRIPs Agreement provides that :"The term of protection available or patentsshall not end before the expiration of a period of twenty years counted from the filing date." Consequently, in most patent laws nowadays, the term of patent is 20 years from the filing date of the application. This ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patent
A patent is a type of intellectual property that gives its owner the legal right to exclude others from making, using, or selling an invention for a limited period of time in exchange for publishing an sufficiency of disclosure, enabling disclosure of the invention."A patent is not the grant of a right to make or use or sell. It does not, directly or indirectly, imply any such right. It grants only the right to exclude others. The supposition that a right to make is created by the patent grant is obviously inconsistent with the established distinctions between generic and specific patents, and with the well-known fact that a very considerable portion of the patents granted are in a field covered by a former relatively generic or basic patent, are tributary to such earlier patent, and cannot be practiced unless by license thereunder." – ''Herman v. Youngstown Car Mfg. Co.'', 191 F. 579, 584–85, 112 CCA 185 (6th Cir. 1911) In most countries, patent rights fall under private la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cam-and-bolt Connector
A butt joint is a wood joint in which the end of a piece of material is simply placed (or “butted”) against another piece. The butt joint is the simplest joint. An unreinforced butt joint is also the weakest joint, as it provides a limited surface area for gluing and lacks any mechanical interlocking to resist external forces. Nonetheless, it generally provides sufficient strength in most cases, particularly when fasteners are used. Additional reinforcement through ties and plates is often used to improve the characteristics of butt-jointed structures. The joint is widely used in many applications due to its simplicity, notably in rough carpentry and construction. Methods There are several types of butt joint based on the orientation of the pieces being joined. These include the T-butt, end-to-end butt, Miter butt and edge-to-edge butt. The T-butt joint is a very simple joint to construct. Members are simply docked (cut off) at a right angle and at the required length. O ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drywall Screw
Drywall (also called plasterboard, dry lining, wallboard, sheet rock, gib board, gypsum board, buster board, turtles board, slap board, custard board, gypsum panel and gyprock) is a panel made of calcium sulfate dihydrate (gypsum), with or without additives, typically extruded between thick sheets of facer and backer paper, used in the construction of interior walls and ceilings. The plaster is mixed with fiber (typically paper, glass wool, or a combination of these materials); plasticizer, foaming agent; and additives that can reduce mildew, flammability, and water absorption. In the mid-20th century, drywall construction became prevalent in North America as a time- and labor-saving alternative to lath and plaster. History Sackett Board was invented in 1890 by New York Coal Tar Chemical Company employees Augustine Sackett and Fred L. Kane, graduates of Rensselaer Polytechnic Institute. It was made by layering plaster within four plies of wool felt paper. Sheets were thick with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wood Screw
A screw is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to the head. The most common uses of screws are to hold objects together and there are many forms for a variety of materials. Screws might be inserted into holes in assembled parts or a screw may form its own thread. The difference between a screw and a bolt is that the latter is designed to be tightened or released by torquing a nut. The screw head on one end has a slot or other feature that commonly requires a tool to transfer the twisting force. Common tools for driving screws include screwdrivers, wrenches, coins and hex keys. The head is usually larger than the body, which provides a ''bearing surface'' and keeps the screw from being driven deeper than its length; an exception being the ''set screw'' (aka grub screw). The cylindrical portion of the screw from the underside of the head to the tip is called the ''shank''; it may be fully or partially ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hex Head
At a minimum, a screw drive is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it. Usually, it also involves a mating tool, such as a screwdriver, that is used to turn it. Some of the less-common drives are classified as being "tamper-resistant". Most heads come in a range of sizes, typically distinguished by a number, such as "Phillips #00". Overview Slotted drives Slot Slot screw drives have a single horizontal indentation (the ''slot'') in the fastener head and is driven by a "common blade" or flat-bladed screwdriver. This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed. Blunt or damaged tools can easily be re-ground as required in any workshop. It is unique because the slot head is straightforward to manufacture, and because it can be driven by a simple handtool. The ''slotted screw'' is commonly found in existing p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
