![]() ![]() Earlier versions have a platform to lift on a vehicle's frame or axle.Įlectrically operated car scissor jacks are powered by 12 volt electricity supplied directly from the car's cigarette lighter receptacle. ![]() The jack shown at the left is made for a modern vehicle and the notch fits into a jack-up point on a unibody. They are inexpensive and are common in manufacturer-supplied breakdown kits. The first attestation in the Oxford English Dictionary of jack in the sense 'a machine, usually portable, for lifting heavy weights by force acting from below' is from 1679, referring to 'an Engine used for the removing and commodious placing of great Timber.' Jackscrew Scissor jack Jackscrews are integral to the scissor jack, one of the simplest kinds of car jack still used.Ī scissor jack use the mechanical advantage of a leadscrew and 4-bar linkage to allow a human to lift a vehicle by manual force alone. From here, the word was 'applied to things which in some way take the place of a lad or man, or save human labour'. The personal name Jack, which came into English usage around the thirteenth century as a nickname form of John, came in the sixteenth century to be used as a colloquial word for 'a man (of low status)' (much as in the modern usage 'jack of all trades, master of none'). Industrial jacks can be rated for many tons of load. Jacks are usually rated for a maximum lifting capacity (for example, 1.5 tons or 3 tons). ![]() The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that maintenance can be performed. A mechanical jack employs a screw thread for lifting heavy equipment. Jack which can lift a mobile homeĪ jack is a mechanical lifting device used to apply great forces or lift heavy loads. For other uses, see Jack (disambiguation). This article is about the lifting device. ![]()
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