08-09-2017, 03:20 PM
A jack a screw or a worm is a mechanical device used as a lifting device to lift heavy loads or to apply great forces. A mechanical jack uses a screw thread to lift heavy equipment. A hydraulic jack uses hydraulic power. The most common form is a car cat, floor cat or garage cat, which raises vehicles so that maintenance can be performed. Cats usually have a maximum lifting capacity (eg, 1.5 tonnes or 3 tonnes). Industrial jacks can be categorized for many tons of cargo.
Hydraulic connector
In 1838 William Joseph Curtis presented a British patent for a hydraulic jack.
In 1851, inventor Richard Dudgeon was granted a patent for a "portable hydraulic press" - the hydraulic jack, a cat that proved to be far superior to the bolts of the screws in use at the time.
Hydraulic jacks are typically used for tent work, rather than as emergency cat to be carried with the vehicle. The use of cats not designed for a specific vehicle requires more than the usual care in the selection of soil conditions, the point of elevation in a vehicle and to ensure stability when the cat extends. Hydraulic jacks are often used to lift lifts in low and medium height buildings.
A hydraulic jack uses a liquid, which is incompressible, which is forced into a cylinder by a pump plunger. The oil is used since it is self lubricating and stable. When the plunger retracts, oil is withdrawn from the reservoir through a suction check valve in the pump chamber. When the plunger moves forward, it pushes the oil through a discharge check valve on the cylinder. The ball of the suction valve is inside the chamber and opens with each withdrawal of the plunger. The ball of the discharge valve is outside the chamber and opens when the oil is introduced into the cylinder. At this point, the suction ball inside the chamber is forced shut and oil pressure is formed in the cylinder.
In a floor jack (also known as "car jack") a horizontal plunger pushes the short end of an alarm arm, with the long arm providing vertical movement to a lifting skid, held horizontal with a horizontal link. Floor jackets usually include wheels and wheels, which compensates for the bow that takes the lifting platform. This mechanism provides a low profile when it collapses, for an easy maneuver under the vehicle, while allowing a considerable extent.
Hydraulic connector
In 1838 William Joseph Curtis presented a British patent for a hydraulic jack.
In 1851, inventor Richard Dudgeon was granted a patent for a "portable hydraulic press" - the hydraulic jack, a cat that proved to be far superior to the bolts of the screws in use at the time.
Hydraulic jacks are typically used for tent work, rather than as emergency cat to be carried with the vehicle. The use of cats not designed for a specific vehicle requires more than the usual care in the selection of soil conditions, the point of elevation in a vehicle and to ensure stability when the cat extends. Hydraulic jacks are often used to lift lifts in low and medium height buildings.
A hydraulic jack uses a liquid, which is incompressible, which is forced into a cylinder by a pump plunger. The oil is used since it is self lubricating and stable. When the plunger retracts, oil is withdrawn from the reservoir through a suction check valve in the pump chamber. When the plunger moves forward, it pushes the oil through a discharge check valve on the cylinder. The ball of the suction valve is inside the chamber and opens with each withdrawal of the plunger. The ball of the discharge valve is outside the chamber and opens when the oil is introduced into the cylinder. At this point, the suction ball inside the chamber is forced shut and oil pressure is formed in the cylinder.
In a floor jack (also known as "car jack") a horizontal plunger pushes the short end of an alarm arm, with the long arm providing vertical movement to a lifting skid, held horizontal with a horizontal link. Floor jackets usually include wheels and wheels, which compensates for the bow that takes the lifting platform. This mechanism provides a low profile when it collapses, for an easy maneuver under the vehicle, while allowing a considerable extent.