Jacks are used to lift vehicles or objects off the ground. They come in scissor and worm screw designs, made of steel or light stainless steel. Scissor jacks are simple and portable, while worm screw jacks offer greater accuracy and can lift heavier loads.
A jack is a device used to fully or partially lift a vehicle or other object off the ground. Depending on their size, these devices can be used to lift the corner of a vehicle or to lift it several feet into the air so workers can access the underside of the vehicle. Screw jacks are often found in machine shops, auto repair shops, and the auto racing industry. Many vehicles also have a screw jack included in the spare tire kit, so drivers can fix a flat tire more easily. Very large jackscrew systems are also used to lift houses for foundation repair or replacement.
These devices are usually made of steel, lead or light stainless steel. They come in two basic versions, scissor jacks and worm screw jacks. Another type of jack design, based on hydraulic principles, is used primarily in industrial and manufacturing plants and does not function like a screw jack.
Scissor jacks are the simplest design and are typically used for flat tire repair. They have a scissor design that is operated using a large lead screw. The bottom of the jack rests on the ground while the top fits under the body of a car. A screw is inserted into the center of the scissor lift and is turned to the right to raise the jack and lift the car. After changing the tire, the screw is turned to the left to bring the car back to the ground.
Worm screw jacks have a very large screw shaped body. At the top is a lifting platform, which is used to support a vehicle, house or other object. Since the jack is operated with a ratchet movement, the lifting platform is raised to the height of the screw body. A worm screw jack typically offers a greater level of accuracy and consistency than a scissor jack, and may also be capable of lifting heavier loads. This device is also known as a “machine screw jack”.
Although scissor jacks can only lift a relatively small amount of weight, they offer a number of benefits. They are convenient and easy to use, allowing almost anyone to successfully lift a vehicle to change a tire or perform minor repairs. They’re also small and light, making them portable enough to carry in the trunk of a car along with a spare tire.
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