Telescopic ruler for measuring length

Abstract

The invention discloses a telescopic ruler for measuring length. The telescopic ruler comprises a main ruler and a plurality of stages of auxiliary rulers which are sequentially sleeved in a sliding manner, wherein each auxiliary ruler comprises a connecting block and a ruler strip which is arranged on one side surface of the connecting block in a sliding manner, two side surfaces of each auxiliary ruler are respectively provided with a limiting guide groove, and the limiting guide grooves penetrate through the ruler strips and extend to the connecting blocks; the auxiliary ruler is in sliding fit with the main ruler sliding groove of the main ruler or the ruler strip sliding groove of the last auxiliary ruler, and the limiting guide groove is in sliding fit with a corresponding first check block located on an inner wall of the main ruler sliding groove or a corresponding second check block located on an inner wall of the corresponding ruler strip sliding groove; a locking mechanism which enables the auxiliary rulers to be kept in a complete inward contraction state or a complete outward extension state is arranged in the connecting block, and when the telescopic ruler contracts to the shortest state, bottom faces of all the auxiliary rulers are flush with a bottom face of the main ruler; when the telescopic ruler is extended to the longest state, top surfaces of all the ruler strips are flush with the top surface of the main ruler, and the main ruler and all the ruler strips are spliced in sequence. The telescopic ruler is convenient to use, high in measurement precision and accurate in reading.

Description

technical field [0001] The invention relates to a telescopic ruler for measuring length. Background technique [0002] At present, mechanical tools commonly used for length measurement include tape measure, steel ruler and retractable ruler. The tape measure is easy to carry and has a large measurement range at one time. However, the starting end of the tape measure needs to be fixed during use, which is inconvenient to use. When the measurement length is too long The tape measure is easy to suspend and swing around under the action of external force, so the measurement error is large; the steel ruler is easy to use and has high measurement accuracy, but it is inconvenient to carry when the length of the steel ruler is large, and it is inconvenient to use when the length is small and the measurement range is small. The telescopic ruler has been widely used. The telescopic ruler is not only easy to carry, but also has a large measurement range at one time and is easy to use. ...

AI Technical Summary

Problems solved by technology

[0002] At present, mechanical tools commonly used for length measurement include tape measure, steel ruler and retractable ruler. The tape measure is easy to carry and has a large measurement range at one time. However, the starting end of the tape measure needs to be fixed during use, which is inconvenient to use. When the measurement length is too long The tape measure is easy to suspend and swing around under the action of external force, so the measurement error is large; the steel ruler is easy to use and has high measurement accuracy, but it is inconvenient to carry when the length of the steel ruler is large, and it is inconvenient to use when the length is small and the measurement range is small. The telescopic ruler has been widely used. The telescopic ruler is not only easy to carry, but also has a large measurement range at one time and is easy to use. However, the common telescopic ruler at present, the main ruler and the multi-level sub-ruler are uniformly misaligned in the radial direction, and the measurement is thin and long. It is easy for the main scale or the auxiliary scale to not be in contact with the object to be measured, so errors will occur during readings and the measurement results will be inaccurate, and the auxiliary scale is usually in a free state, so the auxiliary scale is easy to move during the measurement process. Inconvenient to use; in some cases, when both the length and the angle need to be measured, if you have to carry each tool, it will make the measurement very inconvenient

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