- jackscrews
- n. machine that raises heavy objects
English contemporary dictionary. 2014.
jackscrews
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Jackscrew — A jackscrew is a type of jack which is operated by turning a leadscrew. It is also known as a screw jack, and are commonly used as car jacks.A jackscrew s compressive force is obtained through the tension force applied by its leadscrew. An Acme… … Wikipedia
Computer case screws — From left to right: a 6 32 thumbscrew, a 6 32 screw, an M3 screw, and a self tapping screw for case fans Computer case screws are the hardware used to fasten together parts of a computer case and to fasten the system components (such as… … Wikipedia
Raising of Chicago — During the 1850s and 1860s engineers carried out a piecemeal raising of the level of central Chicago. Streets, sidewalks and buildings were either built up or else physically raised up on jacks. This work was paid for both out of the public purse … Wikipedia
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Jack (device) — This article is about the lifting device. For other uses, see Jack (disambiguation). A jack is a mechanical device used to lift heavy loads or apply great forces. Jacks employ a screw thread or hydraulic cylinder to apply very high linear forces … Wikipedia
crosshead — /kraws hed , kros /, n. 1. Print. a title or heading filling a line or group of lines the full width of the column. 2. Mach. a sliding member of a reciprocating engine for keeping the motion of the joint between a piston rod and a connecting rod… … Universalium
Marion Steam Shovel (Le Roy, New York) — Marion Steam Shovel U.S. National Register of Historic Places … Wikipedia
