Automatically recovery long ruler

Abstract

The invention relates to an automatic retracting long ruler, comprising a case, a rotary ruler core plate assembled in the case, a ruler spring and a ruler tape, wherein, the ruler tape is reeled on the ruler core plate, one end of the ruler tape is extended out of the case, the ruler spring is connected with the ruler core plate through a driving mechanism, a braking mechanism is arranged between the button of the case and the ruler core plate. The invention is characterized in that the driving mechanism comprises an inner gear plate, a transitional gear and a gear fixed on the side of the ruler core plate, and a central shaft penetrated and arranged on the case body, wherein, the inner gear plate is fit over the central shaft, the side of the inner gear plate is connected with one end of the ruler spring, the stepped transitional gear is arranged on the side of the central division mounting plate, the first gear of the transitional gear is mesh-connected with the inner gear of the inner gear plate, the second gear of the transitional gear is mesh-connected with the other gear, the gears are assembled on the central shaft together with the ruler core plate. The invention has the advantages of suitability for gear structure, easy assembling, and compact and practical driving mechanism.

Description

technical field [0001] The invention relates to a long ruler in a measuring tool, such as a tape measure or a tape measure. Background technique [0002] There are roughly two types of ordinary tape measures that can be seen on the market today. The tape is recovered by spring force. The spring and the core are mounted on the same axis. After the tape is pulled out by hand, the spring contracts to gather energy. After the tape is released by hand, it is recovered by elastic force. Tape, but the tape of this kind of tape generally does not exceed 10M. Because the tape is relatively long, once it exceeds 10M, it will be wound on the core, which will cause the tape to be relatively large in size, which is not easy to hold and use, and if the elastic force of the spring is too large, it is easy to cause the tape to cut people's hands, and the elasticity is not enough. It is easy to cause the ruler tape to not be wound back on the ruler core smoothly, so further improvement is n...

AI Technical Summary

Problems solved by technology

Because the tape is relatively long, once it exceeds 10M, it will be wound on the core, which will cause the tape to be relatively large in size, which is not easy to hold and use, and if the elastic force of the spring is too large, it is easy to cause the tape to cut people's hands, and the elasticity is not enough. It is easy to cause the ruler tape to not be wound back on the ruler core smoothly, so further improvement is needed; the other is to drive the ruler tape around the ruler core by rotating the ruler core by hand, so as to recycle the ruler tape. Generally, it is more than 10M, and it is called a long ruler. Its disadvantage is that it needs to be used to recycle the tape measure by hand, which is not very convenient to use.

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