JPS5854644Y2 - tape measure - Google Patents

Description

[Detailed Description of the Invention] This invention mainly relates to a tape measure that can easily measure the shortest road width after road construction.

When constructing a new road or paving a new road surface in conventional civil engineering work, the shortest width of the road or paved surface must be measured at regular intervals. Mark one side edge at regular intervals, fix one end of the string or rope to the marks, extend the tip of the string toward the other side edge facing the road, and run the tip of the string left and right along the side edge. After working in the direction to find the shortest point, the shortest position of the path width with respect to the fixed position of the thread, the path width must be measured by measuring with a tape measure, etc. between this position and the fixed position of the thread. It was a hassle.

Even if you try to directly find the shortest road width position with a tape measure and measure the width, roads are usually formed in a semi-cylindrical shape with a raised center and lower left and right sides, so you can directly find the shortest road width position with a tape measure. I couldn't do that.

Therefore, in this invention, the tape measure is equipped with a rotation angle display device for the foot strap support shaft, a rotation assist device for the support shaft, and a measurement position indicating device, so that the shortest position of the road width can be directly determined with the tape measure. , which allows the road width to be easily measured.

Next, the structure of the proposed tape measure will be explained with reference to drawings of embodiments.
A rotation angle display device 3 of a foot strap support shaft 20 is attached to a tape measure for winding up a metal or cloth foot strap 2 with a length scale m attached inside the shaku case 1.
, a rotation assisting device 5 for the support shaft 20, and a measurement position indicating device 8 are provided. 4a is provided with a circumferential surface scale S1 in the circumferential direction, and the outer surface of the disk 4
A side scale S2 is provided in the circumferential direction on b, and the case 1 is placed right sideways below the foot strap support shaft 20 so that the circumferential scale S1 and the side scale S2 attached to the disc 4 can be seen from the outside of the case 1. ,
Alternatively, it may be formed obliquely as shown in FIG. 1 or in a V-shape as shown in FIG. Also, the circumferential scale S1 of the disc 4 is made to go in and out from the edge plate end 1b of the case 1, and the side scale S1 of the disc 4 is placed on a part of the case side plate 1α.
2, and a window hole 13 for viewing the circumferential scale S1 of the disc 4 is provided in a part of the case edge plate 18, and the rotation assisting device 5 of the support shaft 20 protrudes to the outside of the case 1. Insert the center of the spiral spring 6 into the support shaft 20, fix one end of the spring 6 to the support shaft 20, fit the cap 7 on the outside of the spring 6, and fix the other end of the spring 6 to the cap 7. By gripping the cap 7 unrotatably, the supporting shaft 20 is assisted in rotating in the winding direction opposite to the pulling direction of the foot cuff 2,
The measuring position indicating device 8 has one end of a root rod 9 swingably supported on the case side plate 1α on the side of the foot strap outlet 11, and a locking portion 14 at the other end of the root rod 9 is provided. Drop the root rod 9,
It locks when not needed.

Since the proposed tape measure has the above structure, it can be used to measure the road R.
To measure the shortest path width H at path width measurement points P attached at regular intervals on one side edge R1, first pull out the tip of the foot band 2 wrapped inside the shaku case 1 from the opening 11, Fix the tip of the foot strap 2 to the road width measurement point P, and visually move the foot strap 2 from the measurement point P toward the opposite edge R2 of the road R while pulling it out from the case 1, and then pull it out to the opposite edge R2. If the foot strap 2 is moved in the left-right direction along the opposite side edge R2, and at that time, the foot strap 2 does not touch the raised part r in the center of the road surface, measurement can be performed with the tip of the foot strap 2 fixed. The length scale m of the foot band 2 indicates the shortest point at the shortest path width H from the point P, and the path width H becomes longer as it deviates from there in the left-right direction.

If it is difficult to accurately determine the length of the foot cuff 2 using only the length scale m, the support shaft 20, which rotates as the foot cuff 2 is pulled out or rolled up, is provided with a circumferential scale S1 and a side scale S2. According to the rotation of the support shaft 20, the circumferential scale S1 moves in and out from the case edge plate end 1b, and the side scale S2 moves in and out from the case side plate end 1a, and the circumferential scale S1 and the side scale Since S2 magnifies and indicates the amount of rotation of the support shaft 20, it is much easier to read the entry and exit of the foot cuff 2 using the length scale m.

Even if the shortest position Q of the road width H with respect to the measurement point P is determined by the above-mentioned means, the foot strap 2 pulled out from the measurement point P to the shortest position Q will not touch the raised part r that is higher than both side edges R1 and R2 of the road R. The shaku case 1 is tensioned so that it does not touch the opposite side edge R.
2, so after finding the shortest position Q, if the root rod 9, one end of which is pivotally supported on the case side plate 1α, is unlatched, the root rod 9 will move around the shaft support under its own weight. It hangs down and indicates the shortest position Q to the side edge R2 of the road R.

A mark Q' is placed at the indicated position, and the distance between this mark Q' and the measurement point P is measured with the leg band 2 of the shaku case 1 under tension in order to find the shortest position Q.

In addition, when determining the shortest position P, the cap 7 of the rotation assisting device 5 provided on the shaku case 1 moving from the measurement point P toward the opposite side edge R2 is gripped unrotatably from just before reaching the opposite side edge R2. Then, the support shaft 20 rotated after fixing the cap 7
The spiral spring 6 attached between the support shaft 20 and the cap 7 is wound by the amount of rotation, and acts as an assisting force to rotate the support shaft 20 in the winding direction opposite to the pulling direction of the foot strap 2. When the shaku case 1 is moved from side to side along the side edge R2, there is no need to pull out or wrap the leg band 2.

Therefore, if you use the proposed tape measure when measuring the width of a newly constructed road or paved road surface at regular intervals, you can directly find the shortest position from the measurement point, and you can also use the foot straps you pulled out to find the shortest position. Since it can be used to measure the road width, it not only simplifies the work of measuring the road width, but also enables more accurate measurement.

In particular, when measuring the width of a road with a raised center part, if the foot straps are strained so as not to touch the raised part, the shortest position can only be found above the opposite edge of the measurement point; If you use the tape measure's indicating device, you can mark the shortest position on the opposite side edge directly below the measure case, so if you mark the shortest position by eye, the mark will be more accurate than the shortest position you found. There is no deviation, and as a result, the road width can be measured more accurately.

In addition, if you use a rotation assist device, you can automatically wind up a certain section of the leg strap pulled out from the case, and if the length scale of the leg strap is difficult to read, you can use the rotation angle display device installed on the tape measure. By using the circumferential scale or side scale attached to the disc, the shortest position can be determined more precisely, and the proposed tape measure is easy to handle and can be used as a regular tape measure. It has a remarkable effect for construction purposes.

[Brief explanation of drawings]

Figure 1 is a side view of the proposed tape measure, Figures 2 and 3 are side views of similar tape measures, Figure 4 is a longitudinal sectional view showing the main structure of the proposed tape measure, and Figure 5 is the shortest road width relative to the measurement point. A plan view of the road showing how to determine the position, Figures 6 to 8 are enlarged cross-sectional views thereof,
FIG. 9 is a diagram showing how the spiral spring is installed, and FIG. 10 is a front view of a similar tape measure. 1...Shaku case, 1α...Side plate, 1a
...Side plate end, 1...Edge plate, 1b...
...edge plate end, 11...foot strap outlet, 12...
...opening, 13...window hole, 14...
... Locking part, 2 ... Foot strap, 20 ... Support shaft, 3 ... Rotation angle display device, 4 ...
Disc, 4a...Outer peripheral surface, 4b...Outer surface, 5...Rotation assist device, 6...Spiral spring, 7... ... Cap, 8 ... Indicating device, 9 ... Root rod, m ... Length scale, S
l...Surrounding scale, S2...Side scale,
R... Road, R1, R2... Side edge, r
...Prominence, P...Measurement point, Q...
... Shortest position, Q' ... mark, H ......
Road width.

Claims (1)

[Scope of utility model registration request] In a tape measure in which a foot strap 2 with a length scale m is supported in a shaku case 1, a disc 4 is fixed to a foot strap support shaft 20 in the case 1, and the case 1 is attached to the outer circumferential surface 4a of the disc 4. A supporting shaft 20 is provided with a circumferential scale S1 that is visible from the outer circumferential direction of the support shaft 20, and a side scale S2 that is visible from the side tree of the case 1 on the outer surface 4b of the disc, making it possible to minutely read the entry and exit of the foot band 2. a rotation angle display device 3, and a support shaft 2 protruding outward from the case side plate 1α.
0, a spiral spring 6 is attached to the support shaft 20 and the cap 7, and a rotation assisting device 5 is configured to arbitrarily apply an automatic winding force to the support shaft 20, and a case side plate 1.
One end of the root rod 9 is pivotally supported on the foot strap outlet 11 side of a, and the root rod 9 is
A tape measure provided with a measurement position indicating device 8 whose other end is locked to a side plate 1α.