JPH04241Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tape measure suitable for measuring relatively long intervals such as in civil engineering surveying. More specifically, the present invention relates to an improvement in the structure around the scale tape of this tape measure.

[Conventional technology and its problems]

Tape measures for measuring relatively long distances, such as those used in civil engineering surveying, generally have a structure in which a scale tape is wound and stored in a case so that it can be taken in and out. With such a tape measure, measurements are taken by pulling out the scale tape from the case and hanging it between measurement points, but if the distance is long, the scale may be misread, so measurements may be taken twice or in reverse. We are conducting confirmation measurements. This has the disadvantage that surveying takes time and effort, and even after taking such time and effort, there have been cases where the scale has been misread again during confirmation measurements.

Conventionally, against this technical background, tape measures have been known in which, for example, scale tapes are provided with metric scales on the front side and inch scales on the back side to prevent errors by reading both scales. It is being

However, this conventional tape measure has a problem in that it can sometimes convert incorrectly between meters and inches, resulting in incorrect reading of the scale.

[Purpose of invention]

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a tape measure whose scale can be read accurately and reliably.

[Structure of the idea]

In order to achieve the above-mentioned object, the tape measure according to the present invention is a tape measure in which a scale tape is wound and stored in a case so that it can be taken in and out, and scales are provided on both sides of the scale tape, so that the scale on the back side is different from the scale on the front side. is twice the size, and a structure is adopted in which a pull-out piece for pulling out the scale tape is movably provided on the scale tape.

[Effect]

In the above configuration, the pull-out piece holds the pull-out end of the scale tape on the case side and pulls out the scale tape, thereby folding the pulled-out scale tape in half. The difference in scale makes it possible to read scales with the same numerical values on the case side and on one side of the drawer due to the folded state of the scale tape, ensuring accurate and reliable reading of the scales.

〔Example〕

Embodiments of the tape measure according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire tape measure according to the present invention, which is composed of a case 1, a scale tape 2, and a drawer piece 3.

The case 1 includes a shaft 11 for winding and storing the scale tape 2 and a handle 1 for rotating this shaft 11.
2, and further includes a handle 13 for carrying the case 1 and a locking part 15 provided near the outlet 14 for the scale tape 2.

One end of the scale tape 2 is fixed to the shaft 11, and the other end is a drawn-out end, and the drawn-out end is provided with a hook 21 and a weight 22 that are engaged with the locking part 15. Surface 23 of scale tape 2
Scales 25 and 26 are provided on the and back surface 24, respectively, and the scale 26 on the back surface 24 is twice the scale of the scale 25 on the front surface 23. In order to make this difference in magnification clear, the colors of the bases of the front side 23 and back side 24 or the scales 25 and 26 are made different, or in addition to or in addition to the above-mentioned color difference, in order to make it clear for people with color blindness, You are free to vary the brightness.

The pull-out piece 3 includes a support frame 31 through which the scale tape 2 is inserted, and a rotating pipe 3 that is rotatably provided on the support frame 31 and supports the scale tape 2 in a movable manner.
2, and a finger hook 33 provided on the opposite side of the rotating pipe 32 of the support frame 31. Further, as is clear from FIG. 2, a scale illumination line 34 is provided at the support center of the rotary pipe 32 of the support frame 31.

In the tape measure according to the present invention configured as described above,
As shown in FIG. 1, the hanging part 21 of the scale tape 2
The scale tape 2 is folded in half by the rotary pipe 32 of the drawer piece 3 by hooking it on the locking part 15 of the case 1 and pulling the finger hook part 33 of the drawer piece 3 in the direction away from the case 1. It will be withdrawn in good condition. In this state, if the starting point (O point) A of the scale 25 on the surface 23 of the scale tape 2 is aligned with one measuring point, and the scale marking line 34 of the pull-out piece 3 is aligned with the other measuring point, the scale marking line The numerical value B on the scale 25 on the front side 23, which can be read by 34, is the same as the numerical value C on the scale 26 on the back side 24, which coincides with the starting point A. That is, this is because the scale 26 on the back surface 24 is twice the size of the scale 25 on the front surface 23, and the scale tape 2 is folded in half.

Therefore, for example, when a measurer and an assistant perform surveying work in pairs, errors in reading can be prevented by having the measurer and assistant refer to each other by the numbers B and C.

In addition, when precise measurement is required, the back side 24
As mentioned above, it is necessary to make the scale 26 twice as large as the scale 25 on the surface 23, and to shift it by an amount equivalent to half the circumference of the rotating pipe 32 of the drawer piece 3 (usually within a few mm). . This is because the numerical value B is not read at the apex of the scale tape 2 folded in half, but is read at 90 degrees from the apex near the starting point A (scale line 34).

When the surveying is completed, the hanging part 21 of the scale tape 2 is removed from the locking part 15 of the case 1, the shaft 11 is rotated by the handle 12, and the scale tape 2 is wound up. At this time, since the weight 22 is grounded and applies a tensile force to the scale tape 2, twisting and entanglement of the scale tape 2 can be prevented. Note that when the hanging part 21 of the scale tape 2 is removed from the locking part of the case 1, if the weight 22 is pinched and thrown out, the scale tape 2 folded in half can be easily stretched into a single length. I can do it.

In addition to the illustrated embodiments, when surveying is carried out by a pair of a surveyor and an assistant,
The hanging part 21 of the scale tape 2 and the locking part 15 of the case 1 are not necessarily necessary, and one of the two people may hold it by hand. Further, the pull-out piece 3 may be a simple piece made of a single string looped, for example.

[Effect of idea]

As described above, the tape measure according to the present invention makes it possible to read scales with the same numerical value at both measurement points, and thus has the effect of making it possible to read the scales accurately and reliably. Moreover, this accurate and reliable reading of the scale eliminates the need for conventional confirmation measurements such as double measurement and countermeasurement, which has the effect of contributing to speeding up surveying.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a tape measure according to the present invention, and FIG. 2 is an enlarged view of the main part of FIG. 1... Case, 2... Scale tape, 23...
...Front side, 24... Back side, 25, 26... Scale, 3
...Drawer piece.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A tape measure consisting of a scale tape that is wound and stored in a case so that it can be taken in and out, with graduations on both sides of the scale tape, so that the scale on the back side is twice as large as the scale on the front side. A measuring tape characterized in that the scale tape is movably provided with a pull-out piece for pulling out the scale tape. (2) The tape measure according to claim 1 of the utility model registration claim, in which the base of the scale tape or the scales provided thereon have different colors on both the front and back sides.