The jack is a mechanical device used as a lifting devic […]
The jack is a mechanical device used as a lifting device for lifting heavy objects or applying a large amount of force. Mechanical jacks use threads to lift heavy equipment. Hydraulic jacks use hydraulic power. The most common forms are car jacks, floor jacks or garage jacks, which can improve vehicle maintenance performance. Jacks are usually rated as maximum lifting capacity (eg 1.5 ton or 3 ton). Industrial jacks can withstand loads of tons.
Hydraulic jacks are often used for shop floor work, not as emergency jacks on board. Using jacks that are not specifically designed for a particular vehicle requires more maintenance than usual when selecting ground conditions, jacking points on the vehicle, and ensuring stability when jacks are extended. Hydraulic jacks are commonly used to lift elevators in low and mid-rise buildings.
Hydraulic Bottle Jack is automotive tools that include a hydraulic piston that lifts incredible weights. These hydraulic jacks are designed primarily for commercial applications and include fast-acting air pumps designed to reduce the time required to lift heavy objects. The hydraulic bottle jack is a bottle-shaped jack that has a cylinder and a neck. The interior is a vertical lift slider with some kind of back up pad attached to the top. Jacks can be hydraulic or helical. In the hydraulic version, the hydraulic cylinder is hydraulically supplied by a pump on the bottom plate or vertically from the tank through a pressure hose at a remote location. For single-acting pistons, the range of lift is limited and therefore its use for lifting vehicles is limited to relatively high clearances.
For hoisting of structures such as houses, hydraulic distribution through multiple vertical jacks of the valve makes possible an even distribution of forces while achieving tight control of the elevator. The screw version of the bottle jack is operated by turning a large nut that runs on a threaded vertical ram on the neck of the fuselage. The nut has gear teeth and is rotated onto the body by a bevel gear, which is manually rotated into a square sleeve by means of a jack handle. There may be a second thread ram in the ram to double the retractable range.