A two post hoist is a lifting device with two sets of lift arms connected to two tower structures. They are commonly used in the automotive industry and come in hydraulic, electric, or electro-hydraulic configurations. They can be symmetrical or asymmetrical, and often have equalizer cables to ensure even lifting.
A two post hoist is a device capable of lifting heavy loads using a hydraulic or electric motor and two sets of lift arms. These freight elevators consist of two tower structures, usually referred to as masts. Each mast contains a cable, chain, worm drive or ram connected to a set of lift arms. When the engine is activated, the lifting device is used to lift the lift arms off the ground and subsequently lift a load. These hoists are typically used in automotive applications as an alternative to buried cartridge hoists and four post platform hoists.
The most commonly used type of lifting device in the automotive industry is the two-post hoist, which accounts for approximately 85% of all car and truck lifts. These lifters are versatile and come in a variety of different configurations to suit different situations. The main types of double post hoists are hydraulic and electric, although a combination of the two is also popular. Purely electric two-post goods lifts are popular in Europe, where the lifting mechanism often uses a screw drive. Electro-hydraulic units use an electric motor to generate the fluid pressure needed to operate the lifting mechanism, unlike purely hydraulic units which usually use compressed air.
A common feature that most two mast lift units with electro-hydraulic drives share are equalizer cables. These cables are designed to ensure that the lift arms on each side lift at approximately the same time by connecting the lift mechanism in one tower to the corresponding mechanism in the other. It is possible for these cables to run from one post to the other at the top or bottom, depending on the design. If equalizer cables and plumbing lines run from the bottom of one post to another, some type of protector plate is usually placed over them to prevent damage.
A two post hoist can also be symmetrical or asymmetrical, which refers to the positioning of the arms and how a load is positioned on the hoist. Symmetrical two-post hoists have lift arms of the same length, so any loads will tend to be centered in relation to the towers. An asymmetrical two-post hoist typically has shorter front arms, which results in a greater amount of load located on one side of the towers than the other. This may be desirable when lifting certain loads, such as automobiles, which are substantially heavier in the front than in the rear. Symmetrical hoists are also useful for lifting vehicles in certain circumstances, such as those with particularly long wheelbases.
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