In 1838 William Joseph Curtis filed a British patent for a hydraulic jack. The working principle of a hydraulic jack This piece tilts very slightly, but not enough to render the post dangerously out of plumb. This pad moves independently of the house jack so that it does not turn as the acme-threaded rod is turned with a metal rod. On the top of the jack is a cast iron circular pad that the jacking post rests on. The house jack can be used for jacking carrying beams that have settled or for installing new structural beams. This process is repeated until the desired height is reached. A series of jacks is used and then wood cribbing temporarily supports the structure. Electric jacks require less effort from the motorist for operation.Ī house jack, also called a screw jack, is a mechanical device primarily used to lift buildings from their foundations for repairs or relocation. The electrical energy is used to power these car jacks to raise and lower automatically. 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 right is made for a modern vehicle and the notch fits into a jack-up point on a unibody. Scissor car jacks usually use mechanical advantage to allow a human to lift a vehicle by manual force alone. 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 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'). This is usually adjusted using a wrench or other similar tool to fine tune the exact height that the stand reaches off the ground.Threaded rod, seven inches (180 mm) fully extended Other types of stands and lifts work off of a threaded screw system, which simply uses an adjustable screw to change how much space there is between the ground and the top of the stand. They often work on a lever system that gradually applies more and more pressure until the auto is lifted off the ground to a sufficient degree. Most automotive jacks are powerful hydraulic lifts that are capable of supporting very large loads for extended periods of time. Keeping proper maintenance of the device can keep it functioning well for a long time. This also prevents tipping over while under load. The lift is safe because of the low profile and spread-out design that allows it to be incredibly stable. This type of jack is a durable, safe design that is widely used in both small cars and large trucks. This lift is one of the easiest types of lift to use, with its longer lever arm and simple motion action. It is far less prone to tip over while under a load, helping to avoid serious injury.įloor jacks are used to raise up one side of an automobile so that inspections and maintenance can be performed on the undercarriage. The much larger footprint of this type of jack also makes it safer than many other jacks. Other types of jacks often have trouble getting under some of the lower vehicles. Floor Jack: With a lower profile than the bottle type jack, the floor jack is able to squeeze under vehicles that are lower to the ground.Its commonly used when working with trucks and other large vehicles due to its high weight capacity. Bottle Jack: Named for its characteristic bottle-like shape, this type of jack is usually less expensive than most models of floor jacks.There are two main kinds of jacks available for personal use, and each one has its specific uses. The simplest way to do this is by using a hydraulic jack. Performing most repairs of a car require being able to access the underside of the car or truck. What are the differences between floor jacks and bottle jacks? At this point, lifting the automobile quickly becomes a necessity with many designs having very low floor clearance, you cant get underneath without first raising the car up. Many maintenance jobs cant be fully completed without being able to get underneath the automobile and take a look at the systems that arent available by simply looking under the hood. Stands and other car jacks are very useful tools to have in any amateur or professional garage or auto repair shop.
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