FACTOID # 29: 73.3% of America's gross operating surplus in motion picture and sound recording industries comes from California.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Screwdriver" also viewed:
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Screwdriver
A basic screwdriver made by Craftsman (slotted tip shown)
A basic screwdriver made by Craftsman (slotted tip shown)
A rechargeable battery-powered electric screwdriver from Black & Decker
A rechargeable battery-powered electric screwdriver from Black & Decker

The screwdriver is a device specifically designed to insert and tighten, or to loosen and remove, screws. The screwdriver comprises a head or tip which engages with a screw, a mechanism to apply torque by rotating the tip, and some way to position and support the screwdriver. A typical hand screwdriver comprises an approximately cylindrical handle of a size and shape to be held by a human hand, and an axial shaft fixed to the handle, the tip of which is shaped to fit a particular type of screw. The handle and shaft allow the screwdriver to be positioned and supported and, when rotated, to apply torque. Screwdrivers are made in a variety of shapes, and the tip can be rotated manually or by an electric or other motor. Image File history File links Metadata Size of this preview: 800 × 287 pixelsFull resolution (2376 × 852 pixel, file size: 471 KB, MIME type: image/jpeg) Created by User:Fcb981 File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Metadata Size of this preview: 800 × 287 pixelsFull resolution (2376 × 852 pixel, file size: 471 KB, MIME type: image/jpeg) Created by User:Fcb981 File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Craftsman is a line of tools and lawn and garden equipment, owned by The KCD IP, LLC. Although items sold carry a Craftsman brand name, they are made by various contractors. ... Download high resolution version (1374x422, 94 KB)Electric screwdriver File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Download high resolution version (1374x422, 94 KB)Electric screwdriver File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Black & Decker (NYSE: BDK) is a corporation based in Towson, Maryland, that is best known for power tools and home appliances. ... Screws come in a variety of shapes and sizes for different purposes. ... Torque applied via an adjustable end wrench Relationship between force, torque, and momentum vectors in a rotating system In physics, torque (or often called a moment) can informally be thought of as rotational force or angular force which causes a change in rotational motion. ... A shaft can be Look up shaft in Wiktionary, the free dictionary. ... An engine in the broadest sense, is something that produces an output effect from a given input. ...


A screw has a head with a contour such that an appropriate screwdriver tip can be engaged in it in such a way that the application of sufficient torque to the screwdriver will cause the screw to rotate.

Contents

History

Gunsmiths still refer to a screwdriver as a "turnscrew", under which name it is an important part of a set of pistols. The name was common in earlier centuries, used by cabinet makers and shipwrights and perhaps other trades.


Screws

Stanley Yankee No 130A, spiral or ratchet screwdriver.
Stanley Yankee No 130A, spiral or ratchet screwdriver.

There are many types of screw heads, of which the most common are the slotted, Phillips, PoziDriv/SupaDriv (crosspoint), Robertson, TORX, and Allen (hex). Image File history File links Metadata Size of this preview: 800 × 87 pixelsFull resolution (1088 × 118 pixel, file size: 110 KB, MIME type: image/jpeg)Photograph by Bill Bradley. ... Image File history File links Metadata Size of this preview: 800 × 87 pixelsFull resolution (1088 × 118 pixel, file size: 110 KB, MIME type: image/jpeg)Photograph by Bill Bradley. ... Henry F. Phillips (1890 - 1958) was a businessman from Portland, Oregon and inventor of the Phillips-head screw and screwdriver. ... The Pozidriv screw type is patented, similar to cross-head but designed not to slip, or cam out. ... The Pozidriv® is a type of screw head and screwdriver, jointly patented by the Phillips Screw Company and American Screw Company. ... Robertson screwdrivers A Robertson screwdriver is a type of screwdriver with a square-shaped tip with a slight taper (in the same way that flatheads, Phillips, Allen, and Torx have flat, ×-shaped, hexagonal, and hexagrammal tips, respectively). ... TORX, developed by Camcar LLC of Acument Global Technologies (formerly Camcar Textron), is the trademark for a type of screw head characterized by a 6-point star-shaped pattern (in the same way that slotted heads, Phillips, Hex, and Robertson have flat, ×-shaped, hexagonal, and square tips, respectively). ... Hex keys of various sizes. ...


Screwdrivers come in a large variety of sizes to match those of screws, from tiny jeweler's screwdrivers up.


If a screwdriver that is not the right size and type for the screw is used, it is likely that the screw will be damaged in the process of tightening it. This is less important for PoziDriv and SupaDriv, which are designed specifically to be more tolerant of size mismatch. When tightening a screw with force, it is important to press the head hard into the screw, again to avoid damaging the screw.


Screwdriver variations

Jeweler's screwdriver set
Jeweler's screwdriver set

Some manual screwdrivers have a ratchet action whereby the screwdriver blade is locked to the handle for clockwise rotation, but uncoupled for counterclockwise rotation when set for tightening screws; and vice versa for loosening. Image File history File links Download high-resolution version (843x1413, 174 KB) Summary Licensing File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Screwdriver ... Image File history File links Download high-resolution version (843x1413, 174 KB) Summary Licensing File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Screwdriver ... A ratchet lever hoist. ...


Many screwdriver designs have a handle with detachable head (the part of the screwdriver which engages with the screw), called bits as with drill bits, allowing a set of one handle and several heads to be used for a variety of screw sizes and types. This kind of design has allowed the development of electrically powered screwdrivers, which, as the name suggests, use an electric motor to rotate the bit. Some drills can also be fitted with screwdriver heads. Drill bits are cutting tools used to create cylindrical holes. ...

A number of screwdrivers used to remove faulty electronics from a laptop computer
A number of screwdrivers used to remove faulty electronics from a laptop computer

Manual screw drivers with a spiral ratchet mechanism to turn pressure (linear motion) into rotational motion also exist, and predate electric screwdrivers. The user pushes the handle toward the workpiece, causing a pawl in a spiral groove to rotate the shank and the removable bit. The ratchet can be set to rotate left or right with each push, or can be locked so that the tool can be used like a conventional screwdriver. Once very popular, these spiral ratchet drivers, using proprietary bits, have been largely discontinued by manufacturers such as Stanley, although one can still find them at vintage tool auctions. Companies such as Lara now offer a modernized version that uses standard 1/4-inch hex shank power tool bits. Since a variety of drill bits are available in this format, it allows the tool to do double duty as a push drill. Image File history File links Metadata No higher resolution available. ... Image File history File links Metadata No higher resolution available. ... The Stanley Works NYSE: SWK, headquartered in New Britain, CT is a household durable goods manufacturer of tools and hardware. ...


Many modern electrical appliances, if they use screws at all, use screws with heads of non-standard shape in an attempt to prevent users of the device from easily disassembling them. TORX is one such pattern that has become very widespread, with suitable screwdrivers widely available in electronics stores. Other patterns of security screws are less common, though sets of security heads are, again, readily available. Blender Small appliance refers to a class of appliances that are semi-portable or which are used on tabletops, countertops, or other platforms. ...


While screwdrivers are designed for the above functions, they are commonly also used as improvised substitutes for pry bars, levers, and hole punches, as well as other tools.


References

Further reading

Witold Rybczynski (born in 1943, in Edinburgh, Scotland), is a Canadian architect, professor and writer. ... One Good Turn: A Natural History of the Screwdriver and the Screw is a book published in 2000 by Canadian architect, professor and writer Witold Rybczynski. ...

External links

Wikimedia Commons has media related to:
Screwdrivers
  • Henry F. Phillips — Phillips Head Screwdriver

  Results from FactBites:
 
ExtremeTech Build It: A Do-It-Yourselfer's Best Resource (508 words)
Dig into our Buying Guides for the info you need before you make that critical purchasing decision.
A Case and Power Supply for Your DIY Media PC The Milwaukee 6546 2.4 Volt Two Speed Screwdriver
Buying the Right Memory--for Now and the Future
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m