A crowbar, also called a wrecking bar, pry bar or prybar, pinch-bar, or occasionally a prise bar or prisebar, colloquially gooseneck, or pig bar, or in Australia a jemmy,[1] is a lever consisting of a metal bar with a single curved end and flattened points, used to force two objects apart or gain mechanical advantage in lifting; often the curved end has a notch for removing nails.
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The design can be used as any of the three lever classes. The curved end is usually used as a first-class lever, and the flat end as a second-class lever.
Designs made from thick flat steel bar are often referred to as utility bars.
Materials and construction
A common hand tool, the crow bar is typically made of medium-carbon steel, possibly hardened on its ends.
Commonly crowbars are forged from long steel stock, either hexagonal or sometimes cylindrical. Alternative designs may be forged with a rounded I-shaped cross-section shaft. Versions using relatively wide flat steel bar are often referred to as "utility" or "flat bars".
Etymology and usage
The accepted etymology[2][3] identifies the first component of the word crowbar with the bird-name "crow", perhaps due to the crowbar's resemblance to the feet or beak of a crow. The first use of the term is dated back to c. 1400.[4] It was also called simply a crow, or iron crow; William Shakespeare used the latter,[5] as in Romeo and Juliet, Act 5, Scene 2: "Get me an iron crow and bring it straight unto my cell."
In Daniel Defoe's 1719 novel Robinson Crusoe, the protagonist lacks a pickaxe so uses a crowbar instead: "As for the pickaxe, I made use of the iron crows, which were proper enough, though heavy."
Types
Types of crowbar include:[6]
- Alignment pry bar, also referred to as Sleeve bar
- Cat’s claw pry bar, more simply known as a cat's paw
- Digging pry bar
- Flat pry bar
- Gooseneck pry bar
- Heavy-duty pry bar
- Molding pry bar
- Rolling head pry bar
See also
References
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