JP2000193402A - Measuring tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly obtain the midpoint between the two reference points. SOLUTION: A measuring tape is constituted in such a way that a pair of drums 2 and 2 is rotatably attached in a housing case 3 formed of a plastic, etc., and the base end sides of scales 8 are respectively fixed to the peripheral surfaces 7 of the drums 2 so that the scales 8 may be wound around the peripheral surfaces of the drums 2 and may be drawn out in the opposite directions from draw-out ports 13 and 13 respectively provided to both sides of the case 3. In addition, teeth 10 and 10 are formed on the peripheral edges of annular flanges 9 and 9 constituting the drums 2 and 2 so that the drums 2 and 2 may be rotated in the opposite directions in an interlocking way when the teeth 10 and 10 are rotatably coupled in parallel with each other in a meshed state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape measure mainly used for construction work.

[0002]

2. Description of the Related Art A tape measure, also called a scale, a convex or the like, has been widely used in construction work and the like. Such a tape measure is configured such that a hollow drum is rotatably mounted in a storage case formed of plastic or the like, and a helical winding spring is built in the hollow drum, and each end of the spiral take-up spring is provided between the center axis of the storage case and the hollow drum. In general, the scale is fixed to the inner surface and the base end of a scale with a scale is fixed to the peripheral surface of the hollow drum so that the scale can be wound up.

[0003] According to such a tape measure, the hollow drum rotates with the operation of pulling out the scale, the scale is unwound from the hollow drum, and when the hand is released from the scale,
The scale is automatically pulled into the storage case by the restoring force of the spiral take-up spring accumulated during the pull-out operation, and is taken up on the peripheral surface of the hollow drum.

[0004] Here, there are many technical improvement trends of the tape measure in terms of keeping the drawn-out scale at a desired position and reducing the size of the storage case.
At present, no major improvement has been made in the basic function of measuring dimensions.

[0005]

However, when it is desired to set the midpoint (center) between two reference points, for example, two opposing points are set.
If you want to put the center position of two walls and attach a lighting fixture to the ceiling or wall corresponding to that position, first measure the distance between the two reference points with the tape measure described above, and then use a calculator or the like to measure the distance. The procedure of calculating a half dimension and then measuring the dimension from one reference point also using a tape measure must be taken.
There has been a problem that the measuring operation is complicated and takes time and effort.

The present invention has been made in view of the above circumstances, and has as its object to provide a tape measure capable of quickly locating a midpoint between two reference points.

[0007]

According to a first aspect of the present invention, there is provided a tape measure according to the present invention, wherein a pair of drums are rotatably mounted in a storage case, respectively. The pair of drums are connected to each other so that the drums rotate in opposite directions in an interlocked state, and the base ends of the scales are fixed to the peripheral surfaces of the pair of drums so that the scales can be freely wound and provided in the storage case Each of the scales can be pulled out from the pair of outlets in opposite directions, and a take-up spring is built in at least one of the pair of drums.

Further, the tape measure according to the present invention comprises the pair of drums so that the other scale is automatically extended by the same length as the drawn-out length of one of the scales. Are marked outside of the mark to indicate the midpoint of the two reference points.

In the tape measure according to the present invention, the pair of drums are arranged in parallel and connected to each other so that the peripheral edges of the flanges mesh with each other.

In the tape measure according to the present invention, the pair of drums are arranged coaxially, and annular racks are respectively provided on opposing side surfaces of the pair of drums, and a partition body is interposed between the pair of drums. A pinion gear meshing with the annular rack is rotatably attached to the partition.

In the tape measure according to the present invention, the pair of drums rotatably mounted in the storage case are connected to each other so as to rotate in opposite directions in an interlocked state.

Therefore, when the scale wound on the peripheral surface of one of the drums is pulled out from the outlet of the storage case, the other drum rotates in the opposite direction in conjunction with the rotation of the drum, and is wound around the drum. The scale that has been taken out is naturally drawn out from the other outlet without performing the pulling operation.

That is, if one scale is pulled out, the other scale is automatically extended in the opposite direction in conjunction with the pull-out operation, so that the midpoint of the two reference points can be easily and easily located. It becomes possible.

With respect to the structure of the pair of drums, since the purpose is to measure the midpoint between the two reference points, two scales are pulled out from the storage case in the opposite direction by the same length as possible. However, it is not always necessary to have a structure in which the other scale is automatically fed out by the same length as the drawn-out length of one scale.

Here, the pair of drums are constructed so that the other scale is automatically extended by the same length as the length of one of the scales, and two reference marks are provided outside the storage case. If a mark indicating the midpoint of a point is attached, the position of the mark in a state where the tip of each scale is positioned at two reference points, that is, indicates the midpoint of the reference point.

The structure and mechanism for connecting the pair of drums to each other so that they rotate in opposite directions in an interlocked manner are arbitrary. For example, the pair of drums are arranged in parallel and the peripheral edges of their flanges mesh with each other. Or a pair of drums are arranged coaxially and annular racks are respectively provided on opposing side surfaces of the pair of drums, and a partition is interposed between the pair of drums. A configuration in which a pinion gear meshing with the annular rack is rotatably attached to the partition body is conceivable.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a tape measure according to an embodiment of the present invention. It is to be noted that the same reference numerals are given to components and the like that are substantially the same as those in the conventional technology, and description thereof is omitted.

FIGS. 1A and 1B are sectional views showing a tape measure according to this embodiment. As can be seen from these figures, the tape measure 1 according to the present embodiment is mounted in a storage case 3 made of plastic or the like so that each of the pair of drums 2 and 2 can rotate freely, and has a scale. By fixing the base end side of the scale 8 to the peripheral surface 7 of each drum 2, the scale 8 is wound on the peripheral surface 7 of each drum 2 and a pair of outlets 13, 13 provided in the storage case 3.
From each other in the opposite direction.

On the other hand, a spiral take-up spring 5 is built in each drum 2, and its proximal end is fixed to the rotating shaft 6 of the storage case 3 and its distal end is fixed to the inner surface of the drum 2. By doing so, the drum 2 can be rotated in the winding direction of the scale 8.

In order to prevent the scale from protruding when the scale 8 is wound up, each of the drums 2 faces the annular flanges 9 and 9 with a distance slightly larger than the width of the scale. The scale 8 is
The drum 2 is sandwiched between these flanges 9, 9.
The teeth 10 are formed on the periphery of the flange 9 as can be clearly seen in FIG. 3C. The pair of drums 2 and 2 are provided on the periphery of the flange 9. By connecting these teeth 10 and 10 rotatably connected in parallel in a state where they are meshed with each other, they rotate in opposite directions in the direction of the arrow in FIG.

A hook 11 is provided at the tip of each scale 8 for locking the tip to the object to be measured, and the drawn scale 8 is temporarily held at a desired position. The holding mechanism 12 is provided on one drum 2 side.

Here, the diameter of the drums 2 and 2 is
The diameter of the periphery of the flange 9 and the number of teeth 10 formed on the periphery are the same, and the other scale 8 is automatically extended by the same length as the drawn-out length of one scale 8. In addition, a mark 2 indicating the midpoint between the two reference points is provided outside the storage case 3 as shown in FIG.
1 is attached.

In the tape measure 1 according to the present embodiment, a pair of drums 2 and 2 rotatably mounted in a storage case 3 are connected to each other so as to rotate in opposite directions in an interlocked state.

Therefore, when the scale 8 wound around the peripheral surface 7 of one of the drums 2 is pulled out from the outlet 13 of the storage case 3, the other drum 2 rotates in the opposite direction in conjunction with the rotation of the drum. Then, the scale 8 wound on the drum is moved to the other outlet 13 without performing the drawing operation.
From the outside.

That is, if the pull-out operation of one of the scales 8 is performed, the other scale 8 is automatically fed in the opposite direction in conjunction with the pull-out operation. The midpoint measurement of the reference point can be performed simply and easily.

In order to locate the midpoint 33 of the two opposing walls 31, 31 as shown in FIG. 3, for example, using the tape measure 1, first, the vicinity of the center of the two walls 31, 31 (approximate position Is set as a working position, and at this working position, the tape measure 1 is placed on the floor 34, for example, and in this state, only one scale 8, for example, only the left scale 8 in FIG.

Then, due to the interlocking of the drums 2 and 2 as described above, the other scale 8 naturally extends in the opposite direction without performing the drawing operation.

As described above, by performing the pull-out operation on only one of the scales 8, the scale 8 is removed from the storage case 3.
8 is extended in the opposite direction. Then, the working position, that is, the installation position of the tape measure 1 is appropriately adjusted so that each end of the scale 8 does not bend in the middle and both ends just come into contact with the opposing wall surfaces 31, 31.

Then, in this state, if the mark 21 attached to the outside of the storage case 3 is positioned on the floor 34 or the wall 32 orthogonal to the above-mentioned opposing wall surfaces 31, 31, the position is the reference point. This is a position indicating the midpoint 33 of the wall surfaces 31, 31.

In order to prevent an error due to the slack of the scale 8 on the drum 2, each scale 8, 8 is pulled lightly from the storage case 3 as necessary, and
It is preferable to take up the slack that has occurred on the peripheral surface 7.

As described above, according to the tape measure 1 according to the present embodiment, the pair of drums 2, 2 rotatably mounted in the storage case 3 are interlocked with each other so as to rotate in opposite directions. The peripheral surface 7 of one of the drums 2
When the scale 8 wound around the drum is pulled out from the outlet 13 of the storage case 3, the other drum 2 rotates in the opposite direction in conjunction with the rotation of the drum, and the scale 8 wound around the drum is rotated. Thus, without being pulled out, it is naturally spouted outward from the other outlet 13, and thus, only by pulling out one scale 8, the other scale 8 is automatically moved in the opposite direction in conjunction with it. It is possible to pay out.

Therefore, for example, even when the center positions of two opposing walls are set, the positions can be easily and easily set. In addition, the work position is sufficient if the work is performed in the vicinity of the middle point distant from the two reference points, so that only one worker is required, and no manpower is required. For the single worker, work only in the vicinity of the middle point is sufficient. .

Further, according to the tape measure 1 according to the present embodiment,
A pair of drums 2 are configured so that the other scale 8 is automatically fed out by the same length as the drawn-out length of one of the scales 8, 8, and two drums 2 are provided outside the storage case 3. Since the mark 21 indicating the midpoint of the reference point is provided, the position of the mark 21 in a state where the tip of each scale 8, 8 is positioned at the two reference points, in the above-described example, at the opposing wall surfaces 31, 31 is the reference. Midpoint 33 of points
And the measurement operation for finding the midpoint between the reference points can be performed very easily.

In the present embodiment, the case where the midpoint of the opposing wall surfaces 31 and 31 is determined has been described as an example. In the case of, it is needless to say that the present invention can be applied to, for example, a case where the center point of the formwork in the foundation work is set as the reference point, that is, the position of the foundation core.

In the present embodiment, the spiral winding spring 5 is incorporated in both of the drums 2 and 2. However, one of them can be omitted as long as the winding force is not insufficient.

In this embodiment, one scale 8 is used.
The drums 2 and 2 are configured so that the other scale 8 is automatically extended by the same length as the extended length of the other scale. However, the extended length of one scale 8 and the extended length of the other scale 8 need not necessarily match. There is no.

In such a configuration, first, while pulling out one scale 8 in the same procedure as described above, the other scale 8 is automatically fed out, and as shown in FIG. 31 and 31 are brought into contact.

Next, the distance from each of the walls 31, 31 read from each of the scales 8, 8 is once positioned as, for example, auxiliary lines 41, 42 on the orthogonal wall 32, and the two auxiliary lines 41, 42 are used. The midpoint 33 of the opposing walls 31, 31 may be located. By the way, auxiliary lines 41, 4
If the distances from the walls 31, 31 at the time of locating 2 are aligned, the midpoint of the opposing walls 31, 31 will be the auxiliary line 41,
It can be easily obtained as the midpoint of 42. In such a configuration, the mark 21 for displaying the midpoint is unnecessary.

In such a configuration, the midpoint cannot be obtained as quickly and easily as in the above-described embodiment because of the increase in the number of measurement procedures. There is no difference from the above embodiment in that the midpoint can be obtained. Rather, accurate positioning can be performed to the extent that there is no room for error due to slack of the scale 8 in the storage case 3. Also, the manufacturing accuracy of the drum 2 for matching the drawing length and the feeding length and the teeth 10
And the accuracy of the engagement is reduced, and the production cost can be reduced.

In this embodiment, the pair of drums 2 are connected to each other so that they rotate in opposite directions in an interlocked state. Are arranged in parallel so as to mesh with each other via the teeth 10 and 10. However, the present invention is not limited to such a configuration, and modified examples as shown in FIGS. 5 and 6 are also conceivable.

The tape measure 51 shown in these figures is arranged so as to be rotatable and coaxial by fitting a pair of drums 53, 53 onto a rotating shaft 6 projecting from the center of each storage case 52, respectively. At the same time, annular racks 57 are provided on opposing side surfaces of the pair of drums, and a pinion gear 56 meshing with the annular racks 57 is connected to the pair of drums 5.
It is configured to be rotatably attached to a partition body 55 sandwiched between 3, 53.

Here, mounting holes 59 are provided at both ends of the partition 55.
The partition 55 can be attached to the storage cases 52, 52 by fitting projections 58 protruding from the inner surface of the storage case 52 into the mounting holes, and a through hole 60 is provided at the center. Is provided, the rotating shaft 6 is passed through the through-hole, and the other rotating shaft 6 is brought into contact with the other rotating shaft 6. In this state, a screw 54 is screwed into the storage case 52,
52 can be integrally fixed.

The drum 53 is substantially the same as the drum 2 except that the annular rack 57 is provided.
For a detailed description of the spiral winding spring 5, the flange 9, etc.
Here, it is omitted.

In such a configuration, the one drum 53
The scale 8 wound around the peripheral surface 7 of the storage case 5
6 is drawn out in the direction of the arrow shown in FIG. 6, a rotational force in the opposite direction is transmitted to the other drum 53 via a pinion gear 56, and the scale 8 wound on the drum is drawn out. Even if no operation is performed, it is naturally spouted outward from the other outlet 61.

Hereinafter, other functions and effects and the method of use are substantially the same as those of the above-described embodiment, and therefore detailed description is omitted. However, unlike the above-described embodiment, a pair of drums 53, 53 are coaxially arranged. By doing so, there is an operational effect that the entire tape measure 51 can be reduced in size.

[0046]

As described above, according to the tape measure of the first aspect of the present invention, only by pulling out one scale, the other scale is automatically extended in the opposite direction in conjunction with the operation. It becomes possible. Therefore, for example, even when the center position of two opposing walls is set, the position can be easily and easily set. Moreover,
The work position only needs to be performed near the midpoint, so that only one worker is required and no manpower is required.

According to the tape measure of the present invention, the position of the mark when the tip of each scale is positioned at two reference points indicates the midpoint of the reference point. There is also an effect that it is possible to extremely easily perform a measurement operation for finding a middle point between them.

Further, according to the tape measure of the present invention, since the pair of drums are arranged coaxially, it is possible to reduce the size of the tape measure as a whole.

[0049]

[Brief description of the drawings]

FIG. 1 is a diagram of a tape measure according to the present embodiment, (a) is a side view in a state where a storage case is partially cut, (b) is a cross-sectional view taken along line AA, (c) is a flange 9, 9 formed teeth 10, 1
FIG. 3 is a detailed view showing a zero engagement state.

FIG. 2 is a front view of the tape measure according to the embodiment.

FIG. 3 is a view for explaining how to use the tape measure according to the embodiment.

FIG. 4 is a view for explaining how to use the tape measure according to the embodiment.

FIG. 5 is an exploded sectional view showing a tape measure according to a modification.

FIG. 6 is an exploded perspective view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tape measure 2 Drum 3 Storage case 5 Winding spring 7 Peripheral surface 8 Scale 9 Flange 10 Teeth 13 Outlet 21 Mark 51 Tape measure 52 Storage case 53 Drum 55 Partition body 56 Pinion gear 57 Ring rack 61 Outlet

Claims (4)

[Claims] 1. A pair of drums are rotatably mounted in a storage case, and the pair of drums are connected to each other such that the pair of drums rotate in opposite directions in an interlocked state. The base end of the scale is fixed to the peripheral surface of each of the scales so that the scale can be wound up and the scales can be pulled out from the pair of outlets provided in the storage case in opposite directions. A tape measure having a winding spring built in at least one of the drums. 2. The pair of drums are configured so that the other scale is automatically extended by the same length as the length of one of the scales, and two reference points are provided outside the storage case. The tape measure according to claim 1, further comprising a mark indicating a midpoint of the tape measure. 3. The tape measure according to claim 1, wherein the pair of drums are arranged in parallel and connected to each other such that the peripheral edges of the flanges mesh with each other. 4. A pair of drums are arranged coaxially and annular racks are respectively provided on opposing side surfaces of the pair of drums, and a partition is interposed between the pair of drums. The tape measure according to claim 1, wherein the meshing pinion gear is rotatably mounted.