Mechanical bottle jack pdf article is about the lifting device. From here, the word was ‘applied to things which in some way take the place of a lad or man, or save human labour’. 1679, referring to ‘an Engine used for the removing and commodious placing of great Timber.
Earlier versions have a platform to lift on a vehicle’s frame or axle. The electrical energy is used to power these car jacks to raise and lower automatically. Electric jacks require less effort from the motorist for operation. This process is repeated until the desired height is reached. On the top of the jack is a cast iron circular pad that the jacking post rests on.
In 1838 William Joseph Curtis filed a British patent for a hydraulic jack. Hydraulic jacks are typically used for shop work, rather than as an emergency jack to be carried with the vehicle. Use of jacks not designed for a specific vehicle requires more than the usual care in selecting ground conditions, the jacking point on a vehicle, and to ensure stability when the jack is extended. A hydraulic jack uses a liquid, which is incompressible, that is forced into a cylinder by a pump plunger.