tape measure

Abstract

The invention provides a tape, which includes a casing, wherein a drum is arranged inside the casing and connected with the casing through a coil spring; a tape belt is accommodated inside the casing; one end of the tape belt is connected with the coil spring and is wound on the drum, and the other end of the tape belt penetrates through a slit formed at the lower part of the casing, extends outwards, and is then connected with a tape hook; the tape includes a locking device; the locking device includes a lock bar and a retainer; the lock bar is connected with the retainer through a connecting part; the lock bar is provided with an operating part arranged on the outer surface of the casing; fixing parts are arranged on the two sides of the operating part and are used for fixing the lock bar inside the casing, and enabling the lock bar to slide on the profile on the outer side of the casing; and the retainer includes a head part positioned in the clearance between the outer peripheral surface of the coiling part of the tape belt, wound around the drum, and the linear part of the tape belt, leading to the slit; and the head part is in magnetic contact with the outer peripheral surface of the coiling part of the tape belt, wound around the drum. The tape provided by the invention has better tape belt locking performance, and has simple structure and high durability.

Description

technical field [0001] The invention relates to a tape measure, in particular to a tape measure with a locking device. Background technique [0002] With the needs of people's measurement work, the tape measure has been widely used. The traditional tape measure includes a housing, and the tape is accommodated in the housing. A drum is set in the middle of the housing, one end of the tape is connected to the drum through a coil spring, and the other end extends to the outside of the housing. This tape measure is not provided with a locking device, and when the user releases one end of the tape stretched out of the housing, the tape is retracted into the housing, which is inconvenient for the user to observe the reading. [0003] Therefore, the Chinese invention patent with the notification number CN1194202C discloses an invention called "a tape locking device for a tape measure", and the structure of the tape measure disclosed by this invention is as follows: figure 1 shown...

AI Technical Summary

Problems solved by technology

[0005] However, when the above-mentioned method of locking the measuring tape is used for a certain period of time, the coil spring 17 will experience mechanical loss, resulting in a decrease in the elasticity of the coil spring 17, which in turn will cause the stopper 18 to fail to insert into the triangular gap of the tape measure, or The stopper 18 cannot be close to the outer circumferential surface of the tape 12 winding drum 11 and the unwound part of the tape 12, which will affect the locking effect of the tape 12 and bring inconvenience to the user.

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