Self-locking measuring tape

Abstract

The invention discloses a self-locking measuring tape and belongs to the field of measuring tools. In an existing measuring tape a tape body of which has the automatic positioning function, the tape body is pressed onto a tape box in a one-side manner to realize positioning. The tape body is easily damaged, and a retainer is quickly worn out. Meanwhile, scales on the surface of the tape body are easily worn out. The part of the interior of an outer shell is provided with a movable rack, a locking block and a locking spring which are positioned close to an opening. The movable rack is capable of moving on the part along the length direction of a tape body. A supporting part and a pressing part are arranged on the movable rack. The locking block is capable of moving up and down relative to the above part of the tape body. The locking block is provided with a locking part and a compressed inclined plane. The locking part and the supporting part are respectively located at the upper and lower sides of the tape body. A spring force of the locking spring is applied onto the movable rack to drive the pressing part to press against the compressed inclined plane so that the locking part and the supporting part together clamp and lock the tape body form the upper and lower sides respectively at the same time. Therefore, the tape body is uniformly stressed and is not easily damaged and deformed. Meanwhile, the clamping efficiency is improved. The abrasion of the locking block with the tape body is relieved. Moreover, the abrasion of scales on the surface of the tape body is also relieved.

Description

technical field [0001] The invention belongs to measuring tools, in particular to a self-locking tape measure. Background technique [0002] The common tape measure cannot be locked by itself after the tape is pulled out of the casing, and needs to be locked manually to prevent the tape from being accidentally drawn into the casing, which is troublesome to operate. [0003] The Chinese invention patent with the authorized notification number CN2767951Y discloses a technical solution of "a tape measure with automatic positioning of the tape", which includes a tape box, a tape installed in it and wound on the hub, a stop block, The spring and the button set through the ruler box; wherein, the stop block is pivotally connected to the position adjacent to the mouth of the ruler box in the ruler box, and is located on the ruler belt; the spring is also located in the position adjacent to the mouth of the ruler box in the ruler box, and makes the The head of the stop remains defl...

AI Technical Summary

Problems solved by technology

[0005] The aforementioned two schemes, in order to realize the automatic positioning of the ruler tape, are all realized by pressing the ruler tape on the ruler box, and the ruler box is always static. When positioning the ruler tape, only rely on the stop block or stopper. One side of the driving wheel (from the front side of the tape) presses the tape on the tape box, which causes the tape to be easily damaged due to uneven force, and the stopper (stop block or brake wheel) wears out quickly, reducing the service life , the scale on the surface of the tape is also easy to wear, affecting the use

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