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This Instrument with an elevating or adjustable head, an elevating tripod (also known as an "elevator tripod") can raise or lower the head that is helpful in situations where you need a few extra inches of elevation and are not wanting to move or readjust your current setup. Many laser level users enjoy using an elevating tripod since the laser level line can be easily adjusted up or down to move a laser line closer or exactly on the work.
Elevating tripods come mainly from the use of rotating lasers and laser scanners, in which the device is to be brought to a defined height. Crank stands are available in different sizes and versions. All stands are equipped with the splay, which prevents unwanted folding back of the legs. When the crank stands, there are direct and indirect drives. The indirect drive prevents unintendeddescending of the central column (with open clamping screw) even under high load. In direct drive, thecrank can be held at the opening of the clamping screw, to prevent the slide down.
Tripods are equipped with single or double telescopes in the center column. The first telescopic crank-operated level can be easy to read with mm-scale set to the exact height, the sliding tube of the second telescoping stage is fixed by a screw clamp.
The tripod is placed in the location where it is needed. The surveyor will press down on the legs' platforms to securely anchor the legs in soil or to force the feet to a low position on uneven, pock-marked pavement. Leg lengths are adjusted to bring the tripod head to a convenient height and make it roughly level.
Once the tripod is positioned and secure, the instrument is placed on the head. The mounting screw is pushed up under the instrument to engage the instrument's base and screwed tight when the instrument is in the correct position. The flat surface of the tripod head is called the foot plate and is used to support the adjustable feet of the instrument.
Positioning the tripod and instrument precisely over an indicated mark on the ground or benchmark requires intricate techniques.