Tape measure and driving mechanism thereof

Abstract

The invention discloses a tape measure. The tape measure comprises a tape shell, a tape core disk, and a driving mechanism, wherein the tape shell is used for accommodating and arranging the tape core disk which can rotate, a tape spring and a tape band; the tape band is wound on the tape core disk, and one end of the tape band extends out of the tape shell; and the tape spring is in driving connection with the tape core disk through the driving mechanism. The tape measure is characterized in that the tape spring is arranged in a cavity on one side of the tape shell; the tape core disk is arranged in a cavity on the other side of the tape shell and is rotatablely arranged on a tape core shaft in the tape shell; the position, which is near the center, of the tape core disk is provided withan accommodation space; and the inside of the accommodation space is provided with a planetary gear speed reduction mechanism which is taken as the driving mechanism to ensure that the tape core diskcan be directly or indirectly connected with the tape spring through the planetary gear speed reduction mechanism. The invention also discloses the driving mechanism which adopts the planetary gear speed reduction mechanism, and the driving mechanism also reduces the volume of the tape measure and the thickness under the condition of improving the variation ratio, and is particularly suitable forlong tape measures.

Description

technical field [0001] The invention relates to the technical field of a tape measure and related driving mechanisms. Background technique [0002] A traditional tape measure includes a ruler case, a ruler core disk and a ruler spring disk. The ruler core disk is set in the ruler casing for pulling out and rewinding the tape. The core disk rotates, and the center is provided with a ruler reed disk shaft. When this kind of tape is used, it is generally a short tape. If the tape is too long, it is not easy to curl up, and the volume of the tape is too large, it is not easy to hold and use, or the speed of the tape is too fast during the rolling process. Especially when the ruler tape just shrinks, it is easy to cause injury accidents, which affects the work of measurement to a certain extent. [0003] In addition, the patent No. ZL99225503.1 is a Chinese utility model patent "Retractable Mechanism for Tape Measure" (authorized announcement number: CN2374839Y). This patent in...

AI Technical Summary

Problems solved by technology

The above-mentioned patents basically set the planetary transmission mechanism between the handle seat and the core plate, so that the operator can quickly and conveniently roll up the scale tape by shaking the hand, but how to better drive the core plate and the scale spring to achieve stability Vigorously recover tapes not reported

[0004] In addition, the patent No. is 200610154503.X's Chinese patent "a long ruler", which includes a housing, a rotatable chi core disk installed in the housing, a chi spring, and a chi tape, and the chi tape is wound around the chi core. On the disk, one end of the ruler belt protrudes out of the housing, and the ruler spring is driven and connected to the core disk through the drive mechanism. The middle split mounting plate divides the cavity of the shell into left and right mounting cavities, wherein the ruler spring is distributed in one installation cavity, the ruler core disc is distributed in the other installation cavity, and one end of the driving mechanism is connected to one end of the ruler spring. The other end of the driving mechanism is connected to the core plate, which is easy to hold and use, easy to assemble and produce, and is suitable for popularization and application on long rulers. The upper gear transmission mechanism is arranged between the springs, so the thickness of the tape measure shell increases, the volume increases, and there are factors that are unfavorable for hand-held operation.

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