Post lift
A post lift is a lifting device which is typically used to raise vehicles inside buildings for easy repair and maintenance access. Most post lifts are above ground, but there are also in-ground varieties.
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[edit] Two post lift
This is the most commonly-used type of post lift. It consists of two upright columns, four adjustable arms attached to a carriage assembly, and two hydraulic cylinders. It is usually mounted to an existing concrete structure, at least 4 inches thick. Most are powered by an electric/hydraulic power unit.
The power unit delivers pressurised hydraulic fluid to the cylinders. A set of equalisation cables is installed between the carriages to ensure that all four arms move together. Automatic safety arm locks are designed to secure the lift arms, once the arm pads have been properly positioned under the vehicle.
[edit] Four post lift
This type of lift allows the vehicle to be driven onto two runways and lifted by its tyres. The advantage of this lift is that their is full access to the underside of the vehicle.
[edit] Drive-on parallelogram
This is a drive-on lift with two runways. The lifting mechanism can move the vehicle a short distance when lifting or lowering; or it can simply be lifted straight up and down. The two parallel runways are usually synchronised by hydraulic or electronic means; sometimes with a torsion bar connected to opposing legs.
[edit] Scissors
Surface-mounted and in-ground scissor lifts are available; either as a drive-on with runways or frame/body-engaging. It is similar to a parallelogram lift but raises and lowers the vehicle in a straight vertical path.
[edit] In-ground lift
This type of lift has its assembly installed below the concrete floor. One or more hydraulic pistons or scissors mechanisms can be used depending on the weight to be lifted.
[edit] Wheel engaging mobile units
Also known as a mobile column lift, this consists of individual lifting columns used in sets of 2, 4, 6, or more units. Each individual column is mobile and contains an electric power unit. Cables or wireless technology is used to synchronise the column lifting and lowering.
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