Constitution of automatic rolling-up tapeline causing case contraction, weight lightening and strip lengthen

Abstract

A structure of automatic return band tape for reducing the ruler shell, lightening the weight and lengthening the ruler tape is disclosed, and the structure of the band tape includes: a ruler shell (1), a winding drum (2) mounted in the ruler shell, a ruler strip (3) winded around the winding drum, a windin device (4) mounted in the winding drum (2), a rotation shaft (5) penetrating the windin device, a base plate (6) mounted on the side of the windin device, a pinion mounted on the center of the base plate; the turbination spring (44) mounted in the said winding wheel (42), the inner ring teeth (422) are mounted on the side of winding wheel, the gear cluster (61) are mounted on the base plate, and joggling with said inner ring teeth (422), the additional pinion (7) is also joggled with the gear cluster (61) and driven by the rotation shaft (5) or winding drum (2) to drive the gear cluster (61) to drive the winding wheel (42) to crinkle the turbination spring (44). For reasons given above, the structure of automatic return band tape can be pulled out longer than traditional band tape, reduce the ruler shell, lighten the weight and unreel quickly.

Description

technical field [0001] The invention relates to a tape measure structure for measuring length. Background technique [0002] The current small tape measure has an arc-shaped steel ruler (that is, the cross-section is arc-shaped), which has excellent uprightness after being pulled out. The length of the ruler ranges from 2m to 10m, but in order to facilitate longer distance For measurement, some operators have developed a larger 15m tape measure (the cross-section of the tape is curved). The tape measure has the advantages of small size, easy to carry, and easy to control in the palm of your hand. [0003] In the above, in addition to the reel, the shell of the 2m ~ 10m small tape includes the ruler strip wound around the periphery of the reel and the scroll spring wound in the reel. After it is released, it will drive the reel to rotate forward and shrink the spring; on the contrary, when the ruler is released, the reel will be reversely rotated by the spring to rewind the...

AI Technical Summary

Problems solved by technology

[0009] In addition, although the tape measure over 10m has a longer length, the disadvantage is that it is bulky, heavy, and difficult to grasp, especially for Orientals; There is no scroll spring in the shell, so the rewinding of the ruler must be performed manually. Therefore, how to reduce the size of the large tape measure, lighten the weight, and make the ruler automatically rewind is what the present invention wants to improve. The fourth point

[0010] Among the above, although the cloth ruler strip and the flat steel ruler of the super-large tape measure can provide a long-distance measurement of 20m to 100m, the volume cannot be reduced. However, it is still unable to meet the user's simpler and labor-saving operation requirements, and the technical means of the present invention can provide a super-large tape measure to improve the above-mentioned problems

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