JP2013160608A - Curvature measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curvature measuring instrument capable of measuring a plurality of radiuses of curvature and easily adjusting the radiuses of curvature.SOLUTION: The curvature measuring instrument includes a plurality of base members 10, measurement pieces 20 each supported by each base member so as to be freely advanced and retreated in its longitudinal direction, and a rotation shaft member 40. Each base member includes a base plate having a guide surface opposed to one surface of each measurement piece, a guide part for guiding the measurement piece attached to the base plate so as to be freely advanced and retreated and at least one shaft hole for inserting the rotation shaft member, which is penetrated into the same position of all the base plates. Each measurement piece is provided with insertion holes 21 connected to the shaft hole in an advancing/retreating step along the base plate on a plurality of predetermined positions along the longitudinal direction of the measurement piece. The rotation shaft member is inserted into the insertion holes and the shaft hole in a state that respective insertion holes formed on the same position in all the measurement pieces are connected to the shaft hole, so that projection lengths of the measurement pieces from respective base members are held at a fixed length and all the measurement pieces are freely rotated around the rotation shaft member.

Description

  The present invention relates to a curvature measuring device capable of measuring a radius of curvature or a diameter, and more particularly to a curvature measuring device that measures a curvature using a measurement piece that opens in a fan shape. In addition, the curvature measuring device which concerns on this invention is suitable as an instrument used in order to set the curvature to a required curvature, when bending and laying an electric power cable etc.

An allowable bending radius is set for the power cable. When the power cable is bent and installed, it is necessary to lay the power cable so as to have a radius of curvature equal to or larger than the allowable bending radius. The permanently installed power cable is laid in a protective tube or pit designed to have a radius of curvature greater than the allowable bending radius, so the operator does not need to pay special attention when laying.
However, in the case of power cables temporarily laid on the ground surface of power plants, substations, etc., since protective tubes and pits cannot be used, strictly control whether the allowable bending radius is satisfied. There is a problem that it is difficult. For example, it is judged whether the allowable bending radius is satisfied by visual inspection based on many years of experience and intuition, or the bending radius is measured by placing a ruler so that it passes through the part that seems to be the center of the curved part, and the allowable bending radius. In fact, it is judged whether or not the radius is satisfied.
As an invention for solving the above problem, Patent Document 1 describes a fan-shaped curved gauge having five legs that open in a fan shape. The leg is composed of a main body in which a dovetail is cut and a toucher that moves forward and backward in the longitudinal direction in the dovetail. The setting can be measured at an arbitrary curvature radius by appropriately setting the amount of protrusion of the tentacle from the main body.

Japanese Utility Model Publication No.59-144405

In the invention described in Patent Document 1, a set screw is attached to each leg in order to fix the tentacle protruding from the main body. Therefore, when adjusting the radius of curvature of the fan-shaped curve gauge, it is necessary to fasten the set screws by the number of the touch elements, which is very complicated.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a curvature measuring device capable of measuring a plurality of curvature radii and simplifying the adjustment operation of the curvature radii.

In order to solve the above-mentioned problem, the invention described in claim 1 includes a plurality of base members, a measuring piece supported by each of the base members so as to be movable in the longitudinal direction, and a rotating shaft member. A wire rod curvature measuring instrument, wherein each base member includes a base plate having a guide surface facing one surface of each measurement piece, and is provided on each base plate so that the measurement piece can be moved forward and backward. A guide portion for guiding, and at least one shaft hole for penetrating the rotation shaft member formed in the same position of all the base plates, and each measuring piece is provided along the base plate Each insertion hole provided in a predetermined plurality of positions along the longitudinal direction of the measurement piece includes insertion holes that communicate with the shaft hole in the process of advancing and retreating. Is inserted into the insertion hole and the shaft hole in a state of being in communication with the shaft hole. By being, it holds the projection length of the measurement piece relative to the respective base member constant, and wherein the all measurement piece is rotatable about a pivot shaft member.
According to the first aspect of the present invention, the rotating shaft member is inserted through both the base member and the measurement piece. Then, by changing the position of the rotating shaft member in the longitudinal direction of the measurement piece, the protrusion length of the measurement piece with respect to the base member is changed to correspond to a plurality of radii of curvature.
According to a second aspect of the present invention, in the first aspect, each of the measurement pieces is provided with a slit having a width smaller than the diameter of the insertion hole so that the plurality of the insertion holes communicate with each other. The shaft member has a large diameter portion having a diameter smaller than the inner diameter of the insertion hole and larger than the width of the slit, and a small diameter portion having a diameter smaller than the width of the slit. It is characterized by that.
In the second aspect of the invention, the small-diameter portion is slid in the slit while the rotating shaft member is inserted into both the base member and the measuring piece, and the position of the rotating shaft member in the longitudinal direction of the measuring piece is changed. .

According to a third aspect of the present invention, in the second aspect, the rotating shaft member has an outer diameter that is aligned with the insertion hole and larger than the slit width, and has an opening at one end in the axial direction. A hollow large-diameter shaft member, and a small-diameter shaft member having a diameter that can be telescopically stored inside the slit from the one end opening of the large-diameter shaft member and that can slide in the slit. Features.
In the invention of claim 3, the small-diameter shaft member can be exposed by moving the large-diameter shaft member in the axial direction. Since the small-diameter shaft member can freely slide in the slit, the position of the rotating shaft member in the longitudinal direction of the measurement piece can be easily changed.
The invention described in claim 4 is characterized in that, in claim 2, one end of the small diameter portion is connected to one end of the large diameter portion so as to be foldable.
In the invention of claim 4, when the storage or the curvature is measured, the rotating shaft member is made of the base member or the measuring piece by inserting the large diameter portion into the shaft hole and the insertion hole and bending the small diameter portion. It is possible to prevent the surface from protruding more than necessary. Further, if the small diameter portion is rotated to make the large diameter portion straight and move in the axial direction, the small diameter portion can be inserted into the shaft hole and the insertion hole. In this state, if the rotating shaft member is slid in the slit, the position of the rotating shaft member in the longitudinal direction of the measurement piece can be changed.

According to a fifth aspect of the present invention, in the first aspect, each of the measurement pieces is provided with a slit having a width smaller than the diameter of the insertion hole so that the plurality of the insertion holes communicate with each other. The shaft member has a shaft portion having a diameter smaller than the inner diameter of the insertion hole and larger than the width of the slit, and the measuring piece slides the rotating shaft member in the slit. The width of the slit is configured to change elastically.
In the invention of claim 5, the slit is expanded and allowed to pass through the rotating shaft member by moving the rotating shaft member along the slit while being inserted into the insertion hole. The position of the rotating shaft member can be easily changed.
According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a rotation angle limiting member that limits a maximum expansion angle between the base members is attached to the base member. It is characterized by.
In the invention of claim 6, by attaching the rotation angle limiting member to the base member, the maximum spread angle between the measurement pieces supported by the base member can be maintained within an angle range suitable for the measurement of the radius of curvature. it can.

The invention according to claim 7 is the invention according to any one of claims 2 to 5, wherein at least one of the shaft hole or the insertion hole is a polygon, and the large-diameter portion of the rotating shaft member is the shaft hole. Alternatively, it is a polygonal column that matches at least one of the insertion holes.
In the invention of claim 7, when the large diameter portion is inserted through the shaft hole or the insertion hole, the rotation of the base member and the measurement piece is prohibited.

  According to the present invention, it is possible to change the longitudinal position of the measurement piece of the rotating shaft member through which the base member and the measurement piece are inserted, so that it is possible to provide a curvature measuring device corresponding to a plurality of curvature radii. . Further, since the member for fixing the protruding position of the measurement piece with respect to the base member is used as the rotating shaft member, the adjustment work of the radius of curvature can be simplified and the number of parts can be reduced.

It is the perspective view which looked at the curvature measuring device which concerns on 1st embodiment of this invention from the surface side. It is the perspective view which looked at the curvature measuring device from the back side. It is a disassembled perspective view of a curvature measuring device. It is a figure which shows a base member, (a) is a perspective view which shows a single base member, (b) is a top view which shows the connection condition of several base members, (c) is each base member. It is a top view which shows a mode that it opened in fan shape. It is sectional drawing which shows the internal structure of a rotating shaft member, (a) is a figure which shows a shortened state, (b) is a figure which shows an expansion | extension state. It is sectional drawing which shows the internal structure of the rotating shaft member which concerns on other embodiment, (a) is a figure which shows a shortened state, (b) is a figure which shows an expansion | extension state. (A) and (b) are the side views for demonstrating the method to change the position of the rotating shaft member in the longitudinal direction of a measurement piece. It is a perspective view which shows the state which extended the curvature measuring device. It is a perspective view which shows the state which extended the curvature measuring device. It is a figure which shows the rotating shaft member of the curvature measuring device which concerns on 2nd embodiment of this invention. (A)-(c) is a side view for demonstrating the method to change the position of the rotating shaft member in the longitudinal direction of a measurement piece. It is a figure which shows the principal part of the curvature measuring device which concerns on 3rd embodiment of this invention, (a) is a top view (top view), (b) is a side view, (c), (d ) Is a plan view (top view) showing the moving process of the measurement piece. It is a top view which shows the principal part of the curvature measuring device which concerns on 4th embodiment of this invention, (a) is a figure which shows the closed state of a curvature measuring device, (b) is a figure which shows an expanded state. is there.

[First embodiment]
A curvature measuring instrument according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of the curvature measuring instrument according to the first embodiment of the present invention as viewed from the front side. FIG. 2 is a perspective view of the curvature measuring instrument as seen from the back side. FIG. 3 is an exploded perspective view of the curvature measuring device. The wire rod curvature measuring instrument according to the present invention moves a rotating shaft member, which is a rotation center of a plurality of measuring pieces that open in a fan shape, in the longitudinal direction of the measuring piece, from the rotating shaft member to the tip of the measuring piece. This is characterized in that the distance can be changed and an arbitrary curvature can be measured.

The wire curvature measuring instrument 1 according to the present invention includes a plurality of base members 10, a measuring piece 20 supported by each base member 10 so as to be movable forward and backward in the longitudinal direction, and a rotating shaft member 40. Yes.
The base member 10 will be described. 4A and 4B are views showing a base member, FIG. 4A is a perspective view showing a single base member, FIG. 4B is a plan view showing a connection state of a plurality of base members, and FIG. It is a top view which shows a mode that each base member was opened in fan shape.
As shown in FIG. 4A, each base member 10 includes a base plate 11 provided with a guide surface 11a facing or slidingly contacting one surface of each measurement piece 20, and the measurement pieces 20 provided on each base plate 11. Each of the base plate 11 and at least one shaft hole 15 through which the rotating shaft member 40 is inserted. In addition, a support belt 17 (rotation angle limiting member) that limits the maximum spread angle between the base members 10 by integrally connecting the base members 10 to the outer side surface on the distal end side of the guide portion 13. It is attached.

The base plate 11 is a rectangular plate-like member, and one surface is a guide surface 11 a that faces one surface of the measurement piece 20.
The guide portion 13 is a member that guides the measurement piece 20 so as to be able to advance and retreat in the longitudinal direction, and is formed on both ends of the base plate 11 in the short direction. The guide part 13 is a rail-shaped member having an L-shaped cross section in the short direction, and one of the two guide parts 13 protrudes from the one edge in the short direction of the base plate 11 toward the guide surface 11a and has a tip end. The base member is bent toward the other guide portion 13 (the other end in the short side direction of the base plate 11) from the other end edge of the base member.
The shape of the guide portion 13 shown in the figure is an example, and other shapes may be used as long as the measurement piece 20 can be guided to move forward and backward in the longitudinal direction. For example, a convex guide portion extending in the longitudinal direction of the guide surface 11a is formed, and a concave portion into which the guide portion is fitted is formed on the surface of the measurement piece 20 facing the guide surface 11a. The piece 20 may be guided so as to advance and retreat in the longitudinal direction.

The shaft hole 15 is disposed (penetrated) near one end (base end) of the base plate 11, and is formed through the base member 10 at the same position. With the shaft hole 15 of each base member 10 in communication, the rotating shaft member 40 having an outer shape matching the shape of the shaft hole 15 is inserted into each shaft hole 15 (see FIG. 3). The member 10 is rotatably supported and each base member 10 can be opened in a fan shape. In use, the base member 10 rotates with the measurement piece 20 held in the base member 10.
As shown in FIGS. 4B and 4C, the support belt 17 connects the base members 10 to each other so that each base member 10 is rotated around the rotation shaft member 40 and opened in a fan shape. In addition, the opening between the adjacent base members 10 is limited to a predetermined angle. Note that the base members 10 that are in a vertical positional relationship (adjacent) to each other when overlapped are connected by the support belt 17. Therefore, the maximum spread angle between the measurement pieces 20 supported by the base member 10 can be maintained within an angle range suitable for the measurement of the radius of curvature. In the present embodiment, the length of the support belt 17 is set so that when each base member 10 is opened in a fan shape around the shaft hole, the expansion angle between adjacent base members 10 is 45 degrees. Has been. Since the five base members 10 are provided, the maximum expansion angle of the entire curvature measuring instrument 1 is 180 degrees.
Although the illustrated support belt 17 has a belt shape, other wire materials such as a string and a rope can be used. Moreover, you may use the member which spreads in planar shape like a fan surface instead of a wire. In addition, the attachment location and length of the support belt shown to this embodiment are examples. Further, the length of the support belt may be arbitrarily adjusted so that the maximum spread angle can be appropriately adjusted.

  The base plate 11 and the guide portion 13 described above may be rigid enough to support the measurement piece 20, and bamboo, wood, or the like can be used in addition to resin and metal. Then, as shown in FIG. 1, the measurement piece 20 is inserted into the space formed by the base plate 11 and the guide portion 13, so that the measurement piece 20 is supported by the base member 10 so as to be movable forward and backward.

The measurement piece will be described with reference to FIGS.
The measurement piece 20 according to this example is a narrow strip-like flat plate-like member, which is made of resin, metal, bamboo, wood, or the like. The measurement piece 20 is longer than the base member 10, and the distal end side of the measurement piece 20 protrudes from the distal end of the base member 10 while being supported by the base member 10. The measurement piece 20 includes insertion holes 21 that communicate with the shaft hole 15 of the base member 10 at a predetermined plurality of positions along the longitudinal direction of the measurement piece 20 in the process of moving back and forth along the base plate 11. That is, each insertion hole 21 is formed in a predetermined arrangement on a straight line along the longitudinal direction of each measurement piece. Further, the measurement piece 20 includes a slit 23 that allows the plurality of insertion holes 21 to communicate with each other. The slit 23 is smaller than the diameter of the insertion hole 21.

Of the two surfaces of the measurement piece 20, an opposing surface 20 a that faces the guide surface 11 a (see FIG. 4A) of the base plate 11 extends from the insertion hole 21 communicating with the shaft hole 15 to the tip of the measurement piece 20. The scale 25 which shows which length corresponds to the allowable bending radius of which power cable is attached | subjected.
The allowable bending radius of the power cable is determined in advance according to the cable type (single core or multiple core), the allowable voltage of the power cable (6 kV, 22 kV, etc.), and the outer diameter (φ) of the power cable. For example, when the cable is a single core, the length (10D) that is 10 times the outer diameter of the cable is generally the minimum allowable bending radius. A scale 25 is engraved on the facing surface 20a of the curvature measuring instrument 1 according to the present embodiment so that the relationship between the type of power cable and the allowable bending radius can be confirmed at a glance.
The curvature measuring device 1 shown in FIG. 2 is a measuring device corresponding to a 6 kV power cable. Each portion of the facing surface 20a that is in the closest position to the tip of the base member 10 when the shaft hole 15 and each insertion hole 21 are communicated with each other has a length from the insertion hole 21 communicating with the shaft hole 15 to the tip of the measurement piece 20. The diameter of the power cable with the same maximum allowable bending radius is noted. In the state shown in the drawing, it is shown that the length from the insertion hole 21 communicating with the shaft hole 15 to the tip of the measurement piece 20 is the same as the maximum allowable bending radius of the power cable of 6 kV-10D-120φ. Yes.
Of course, the scale 25 may directly display the length from the insertion hole 21 to the tip of the measurement piece 20. Moreover, you may display a scale on the surface of the measurement piece 20 which is an opposite surface of the opposing surface 20a.

A string insertion hole 27 is formed through each tip of each measurement piece 20. A guide string 29 is inserted through the string insertion hole 27 of each measurement piece 20 so as to be freely advanced and retracted. The guide string 29 indicates a standard of a curved shape that can be measured by the curvature measuring instrument 1 by being stretched between the measurement pieces 20 when the curvature measuring instrument 1 is fanned out. The guide string 29 can be formed of a long member such as a string or a band that can be folded or wound around the measurement piece 20.
A stopper 31 that is larger in diameter than the string insertion hole 27 and is fixed to an arbitrary position of the guide string 29 is attached to both ends in the longitudinal direction of the guide string 29. The stopper 31 prevents the guide string 29 from coming out of the string insertion hole 27 of each measurement piece 20 and prevents the guide string 29 stretched between the string insertion holes 27 of each measurement piece 20 from loosening.

The rotating shaft member will be described with reference to FIG. 5A and 5B are cross-sectional views showing the internal structure of the rotating shaft member, wherein FIG. 5A is a diagram showing a shortened state, and FIG. 5B is a diagram showing an extended state.
The rotation shaft member 40 is inserted into the insertion hole 21 and the shaft hole 15 in a state where the insertion holes 21 provided in the same place of all the measurement pieces 20 are communicated with the shaft hole 15. This is a member that keeps the protruding length of the measurement piece 20 to be constant (see FIGS. 1 to 3). Further, it is means for rotating all the base members 10 and the measurement pieces 20 around the shaft hole 15 and any one of the insertion holes 21.
The rotating shaft member 40 is a hollow large-diameter shaft member 41 (large-diameter portion) that is aligned in the insertion hole 21 and has an outer diameter larger than the width of the slit 23 and has an opening 41a at one end in the axial direction. And a small-diameter shaft member 43 (small-diameter portion) having a diameter that can be telescopically stored in the inner end of the large-diameter shaft member 41 and can be slidably moved in the slit 23.

The axial length of the large-diameter shaft member 41 is such that the large-diameter shaft member 41 is connected to the insertion hole 21 and the shaft in a state where the respective shaft holes 15 of all the base members 10 and the respective insertion holes 21 of all the measurement pieces 20 are communicated. The length is set such that all the measurement pieces 20 can be prevented from moving back and forth in the longitudinal direction when inserted into the hole 15. Further, the axial length of the small diameter shaft member 43 is such that the small diameter shaft member 43 is connected to the insertion hole 21 and the shaft in a state where the respective shaft holes 15 of all the base members 10 and the respective insertion holes 21 of all the measurement pieces 20 are communicated. It is set to a length that allows all the measurement pieces 20 to advance and retreat in the longitudinal direction when inserted into the hole 15. The small diameter shaft member 43 has a hollow cylindrical shape, and is inserted into the hollow portion of the large diameter shaft member 41 from one end side thereof.
At the other end of the small-diameter shaft member 43 and the large-diameter shaft member 41, knobs 45 having outer diameters larger than the insertion hole 21 and the shaft hole 15 are attached.
One end of a spring member 47 (elastic urging member) is fixed to the other end portion of the hollow portion of the small diameter shaft member 43. The other end of the spring member 47 is pulled out from one end opening of the small diameter shaft member 43 via the inside of the hollow portion of the small diameter shaft member 43 and is inserted into the hollow portion from the opening 41 a of the large diameter shaft member 41. It is fixed to the other end part in the hollow part.

The spring member 47 is a member that elastically urges the small-diameter shaft member 43 to be drawn into the large-diameter shaft member 41. Pulling each knob 45 in a direction away from each other against the biasing force of the spring member 47 and moving the large-diameter shaft member 41 in the axial direction exposes the small-diameter shaft member 43 and the shaft of the rotary shaft member 40. Longer direction length. Further, when the hand is released from the knob 45, the small-diameter shaft member 43 is accommodated in the hollow portion of the large-diameter shaft member 41 by the elastic force of the spring member 47, and the axial length of the rotating shaft member 40 is shortened.
In addition, it is good also as a structure which abbreviate | omitted the spring member 47 arrange | positioned in the hollow part of the large diameter shaft member 41 and the small diameter shaft member 43 like the rotation shaft member 50 shown below.

FIG. 6 is a cross-sectional view showing another embodiment of the rotating shaft member. The same members as those of the rotation shaft member 40 shown in FIG. Female screw portions 51 are formed in the hollow portions of both ends in the axial direction of the large-diameter shaft member 41 of the rotary shaft member 50, and male screw portions that are screwed to the respective female screw portions 51 at the distal end portion of the small-diameter shaft member 43. 53 is formed. The rotation shaft member 50 can be expanded and contracted in the axial direction in the same manner as the rotation shaft member 40 shown in FIG.
Furthermore, at the time of shortening shown in FIG. 6A, the male screw portion 53 of the small-diameter shaft member 43 and the female screw portion 51 on the other end side of the large-diameter shaft member 41 are screwed to each other. Stretch can be prevented. In addition, since the base member 10 and the measurement piece 20 can be pressed between the respective knobs 45, the base member 10 and the measurement piece 20 are prevented from rotating around the rotation shaft member 50 due to frictional force. can do.
6B, the male screw portion 53 of the small-diameter shaft member 43 and the female screw portion 51 on the other end side of the large-diameter shaft member 41 are screwed together so that the shaft of the rotary shaft member 50 is Since the shortening of the direction length can be prevented, the axial length of the rotating shaft member 50 does not change when the measurement piece 20 is moved forward and backward in the longitudinal direction.

The usage of the curvature measuring device according to the present embodiment will be described with reference to FIGS.
FIG. 7 is a side view for explaining a method of changing the position of the rotation shaft member in the longitudinal direction of the measurement piece. Note that the description of the support belt is omitted. 8 and 9 are perspective views showing a state where the curvature measuring device is expanded. FIG. 8 shows an example in which the rotating shaft member is inserted through the insertion hole closest to the base end of the measurement piece. FIG. 9 shows an example in which the rotating shaft member is inserted through the insertion hole closest to the tip of the measurement piece.
In using this curvature measuring instrument 1, the curvature is first set. As shown in FIG. 7A, the knob 45 is gripped and the large-diameter shaft member 41 is moved in the thickness direction indicated by the arrow A to expose the small-diameter shaft member 43. Then, as shown in (b), only the small diameter shaft member 43 is inserted into the shaft hole 15 and the insertion hole 21. Since the small-diameter shaft member 43 has a smaller diameter than the width of the slit 23, only the measurement piece 20 is in the longitudinal direction (in the direction of arrow B in the figure) while the rotary shaft member 40 is inserted through both the base member 10 and the measurement piece 20. Can be moved to. Since the base member 10 has a single shaft hole, only the measurement piece 20 moves. After inserting the small diameter shaft member 43 into the desired insertion hole 21 among the plurality of insertion holes 21, the large diameter shaft member 41 is moved in the axial direction to cover the small diameter shaft member 43 (FIG. 7A). (See FIG. 5 (a)).

Next, the stopper 31 of the guide string 29 is appropriately moved to expand the base member 10 and the measurement piece 20 in a fan shape. The expansion angle of the base member 10 is fixed at a maximum of 45 degrees by the support belt 17 (see FIGS. 8, 9, and 4). In the present embodiment, since there are five sets of the base member 10 and the measurement piece 20, the curvature measuring instrument 1 as a whole opens up to 180 degrees in a fan shape. The position of the stopper 31 of the guide string 29 is adjusted so that no slack occurs between the measurement pieces 20 (FIGS. 8 and 9).
In the curvature measuring instrument 1, the protruding amount of the measurement piece 20 from the tip of the base member 10 can be changed by changing the position of the insertion hole 21 through which the rotation shaft member 40 is inserted. For example, when the rotation shaft member 40 is inserted into the insertion hole 21a closest to the base end, the result is as shown in FIG. Further, when the rotating shaft member 40 is inserted into the insertion hole 21b closest to the tip end, as shown in FIG. 9, the radius of curvature is smaller than that in FIG. Thus, since the curvature measuring device 1 can be expanded in a fan shape with a desired curvature radius, a plurality of curvature radii can be measured.

In order to determine whether or not the power cable satisfies a predetermined bending radius, the rotating shaft member 40 of the curvature measuring instrument 1 is moved in accordance with the curvature radius to be satisfied by the power cable and opened in a fan shape. Attached to the power cable W, the positional relationship between the power cable W and the curvature measuring device 1 is visually confirmed. If the curvature measuring instrument 1 and the power cable W interfere with each other, it can be determined that the power cable W does not satisfy the predetermined bending radius. In this case, measures such as re-laying the power cable W are taken. Conversely, if the curvature measuring instrument 1 and the power cable W do not interfere with each other, it can be determined that the power cable W satisfies a predetermined bending radius.
In addition, it is also possible to use the curvature measuring device 1 according to the present embodiment for confirming the curvature of a cable pit that accommodates the power cable W at a predetermined bending radius. Moreover, when the length from the insertion hole 21 to the front-end | tip of the measurement piece 20 is directly displayed on the scale 25, it can also be used as an instrument which measures curvature other than an electric power cable.
Thus, according to the present embodiment, the rotational shaft member is moved in the longitudinal direction of the measurement piece, and the sector-shaped radius formed by the curvature measuring device is changed. Here, since the rotating shaft member and the member for determining the protruding position of the measurement piece from the base member are combined, the number of parts can be reduced. Further, since each measurement piece is fixed by a single rotating shaft member, a complicated operation such as adjusting a set screw for each measurement piece is not required, and the adjustment operation of the curvature radius can be simplified.

[Modified Embodiment]
Here, a modified embodiment of the first embodiment will be described. In the first embodiment, each base member has a single shaft hole. However, each base member may have a plurality of shaft holes. More specifically, a plurality of shaft holes may be formed through a plurality of predetermined positions along the longitudinal direction of each base member. Furthermore, each shaft hole may be communicated with a slit having a width smaller than the diameter of the shaft hole, similarly to the insertion hole of the measurement piece. By doing in this way, the distance from the shaft hole used as the rotation center to the tip of the base member can be freely changed by inserting the rotation shaft member.
Here, if the length of the support belt is fixed (fixed), the rotation angle between the base members limited by the support belt is changed. That is, if the rotation shaft member is inserted into the shaft hole on the base end side, the maximum opening angle between the base members can be reduced, and if the rotation shaft member is inserted into the shaft hole closer to the distal end portion, the base The maximum opening angle between the members can be increased.
As described above, according to the present embodiment, the maximum opening angle between the base members limited by the support belt can be changed by providing each base member with a plurality of shaft holes.

[Second Embodiment]
A curvature measuring device according to a second embodiment of the present invention will be described with reference to FIGS. 10 and 11. FIG. 10 is a view showing a rotating shaft member of a curvature measuring device according to the second embodiment of the present invention. FIG. 11 is a side view for explaining a method of changing the position of the rotation shaft member in the longitudinal direction of the measurement piece. Note that the description of the support belt is omitted. The rotating shaft member according to the present embodiment is characterized in that one end portion of the small diameter portion is connected to one end portion of the large diameter portion so that it can be bent (rotated). Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The rotating shaft member 60 has a large-diameter portion 61 having a diameter smaller than the inner diameter of the insertion hole 21 shown in FIG. 1 and larger than the width of the slit 23, and a small diameter having a diameter smaller than the width of the slit 23. Part 63. The small-diameter portion 63 is pivotally supported by one end portion of the large-diameter portion so as to be rotatable by a rotation shaft 65, and can be bent as the entire rotation shaft member 60. In addition, the other end of the large diameter part 61 and the small diameter part 63 is provided with a knob 67 having a diameter larger than that of the insertion hole 21 and the shaft hole. The rotating shaft 65 is provided with a torsion coil spring (not shown), and elastically biases the large diameter portion 61 in a direction in which the small diameter portion 63 is always bent.

The axial length of the large-diameter portion 61 is a length that can prevent the movement of each measurement piece 20 in the longitudinal direction when the shaft holes of all the base members 10 and the insertion holes 21 of each measurement piece 20 are communicated. If it is. Moreover, the length of the small diameter part 63 is also the same, and when the shaft hole of all the base members 10 and the insertion hole 21 of each measurement piece 20 are connected, each measurement piece 20 is moved so that it can advance and retreat in the longitudinal direction. Any length is acceptable.
In order to set the radius of curvature of the curvature measuring instrument 2, as shown in FIG. 11A, the small diameter portion 63 is caused by gripping the knob 67 and rotating the small diameter portion 63 in the direction of arrow C, thereby reducing the small diameter. The part 63 and the large diameter part 61 are aligned. Then, as shown in (b), the rotating shaft member 60 is moved in the arrow D direction (axial direction), and only the small diameter portion 63 is inserted into the shaft hole 15 and the insertion hole 21 as shown in (c). And Since the small-diameter portion 63 has a smaller diameter than the width of the slit 23, only the measurement piece 20 can be moved in the longitudinal direction (the direction of arrow B in the figure) in this state. In addition, after moving each measurement piece 20 to a desired position, the rotation shaft member 60 is moved in the reverse procedure to the above, and the small diameter portion 63 is bent with respect to the large diameter portion 61, so that The small-diameter portion 63 is provided on the measurement piece 20.
As described above, the present embodiment can achieve the same effects as those of the first embodiment. Also, when storing or curvature measurement, the rotating shaft member is placed on the surface of the base member or measurement piece more than necessary by inserting the large diameter portion into the shaft hole and the insertion hole and bending the small diameter portion. Protruding can be prevented.

[Third embodiment]
A curvature measuring device according to a third embodiment of the present invention will be described with reference to FIG. 12A and 12B are diagrams showing the main part of the curvature measuring instrument according to the third embodiment of the present invention, wherein FIG. 12A is a plan view (top view), FIG. 12B is a side view, and FIG. ), (D) are plan views (top views) showing the moving process of the measurement piece. Note that the description of the support belt is omitted. The curvature measuring device according to the present embodiment is characterized in that the slit is configured to be expandable in the short direction. Hereinafter, the same members as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.
The base member 70 of the curvature measuring device 3 includes a base plate 71, a guide portion 73, and a shaft hole 75, as in the first embodiment.
The guide portions 73 are formed at both ends in the lateral direction excluding the base end portion side of the base plate 71. A shaft hole 75 is formed through the base end portion side of the base plate 71. In the vicinity of the shaft hole 75 on the base end side of the base plate 71, the lateral side surface of the measurement piece 20 is exposed.

  The rotation shaft member 80 includes a butterfly bolt 81 and a butterfly nut 83 that is screwed onto the butterfly bolt 81. The shaft 81 a of the butterfly bolt 81 has a diameter that matches the shaft hole 75 and the insertion hole 21 of the measurement piece 20. Further, the width of the slit 23 is narrower than the diameter of the shaft portion 81 a of the butterfly bolt 81. When the curvature measuring device 3 is stored or when measuring the curvature, the wing nut is tightened to prevent the base member 70 and the measuring piece 20 from rotating around the rotating shaft member 80 and the measuring piece 20 from moving in the longitudinal direction. be able to. Further, by loosening the wing nut 83, the measurement piece 20 can be moved in the longitudinal direction, and the base member 70 and the measurement piece 20 can be rotated around the rotation shaft member 80.

Unlike the first embodiment, the measurement piece 20 is formed of a flexible material such as resin. The shape of the measurement piece 20 is the same as that of the first embodiment, and the width of the slit 23 is set to be narrower than the diameter of the shaft portion 81 a of the butterfly bolt 81. However, due to the flexibility of the measuring piece 20, when the shaft portion 81 a of the butterfly bolt 81 is moved from the insertion hole 21 into the slit 23, the slit 23 is expanded and the butterfly bolt 81 is allowed to pass (( c)). Further, when the butterfly bolt 81 is moved from the inside of the slit 23 to the outside of the slit 23, the expanded measurement piece 20 returns to the shape before deformation (the state shown in (d)). Thus, the measurement piece 20 is configured such that the slit 23 expands in the short direction in the process of sliding the shaft portion 81a of the rotating shaft member 80 in the slit 23.
In addition, you may utilize the rotating shaft member shown in 1st embodiment or 2nd embodiment as a rotating shaft member.
As described above, according to the present embodiment, the measurement piece is made flexible so that the slit expands in the short direction, so the wing nut of the rotating shaft member is loosened and the measurement piece is moved in the longitudinal direction. The amount of protrusion of the measurement piece from the base member can be adjusted simply by moving to. In addition, the rotation shaft member can have a simple configuration.

[Fourth embodiment]
A curvature measuring instrument according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 13: is a top view which shows the principal part of the curvature measuring device which concerns on 4th embodiment of this invention, (a) is a figure which shows the closed state of a curvature measuring device, (b) is an expansion state. FIG. In FIG. 13, the base member is omitted. The curvature measuring device according to the present embodiment is characterized in that the insertion hole has a polygonal shape and the large-diameter portion of the rotating shaft member is a polygonal column that matches the insertion hole. Hereinafter, the same members as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.
As shown in the drawing, each measuring piece 90 of the curvature measuring instrument 4 according to the present embodiment has a plurality of regular octagonal insertion holes 91 penetratingly formed at predetermined positions along the longitudinal direction. Further, the outer shape of the large-diameter portion 95 of the rotating shaft member in the present embodiment is an octagonal prism shape that matches the shape of the insertion hole 91. In addition, you may use the thing of any structure shown in FIG.5, FIG.6, FIG.10 as a rotating shaft member. Further, the slit 93 is set to have a width that is narrower than the separation distance between two opposing sides of the insertion hole 91. That is, the width of the slit 93 is set such that the large-diameter portion of the rotating shaft member cannot be inserted unless the measurement piece 90 is deformed.
Here, the regular octagon is a figure that overlaps the figure before rotation when rotated by 45 degrees. Accordingly, since the insertion holes 91 are exactly overlapped with each other with the measurement pieces 90 being shifted from each other by 45 degrees, the curvature measuring instrument of the present embodiment opens in a sector shape with the opening angle of the measurement pieces 90 being shifted by 45 degrees. be able to.

Moreover, since the outer shape of the insertion hole 91 and the rotating shaft member is a polygon, as shown to (a), a curvature measuring device is closed and each insertion hole 91 is connected, and a rotating shaft member is connected. In a state where the large-diameter portion 95 is inserted, the curvature measuring instrument can be prevented from being opened. Moreover, as shown in (b), if the curvature measuring device is opened in a fan shape, the overlapping insertion holes 91 of the respective measurement pieces are communicated and the large-diameter portion 95 of the rotating shaft member is inserted, the measurement pieces 90 The rotation around the rotating shaft member can be prevented. Therefore, the rotation of the measuring piece 90 can be prevented when the curvature measuring device 4 is closed and when the fan-shaped opening is opened. Thus, in this embodiment, since the rotation of the measuring piece 90 is prevented by forming the insertion hole and the large-diameter portion of the rotation shaft member into a polygonal shape, the support belt (see FIG. 1, reference numeral 17) is omitted. Can be configured. Of course, a configuration in which a support belt is also used may be used.
In addition, you may employ | adopt regular polygonal column shapes other than a regular octagon as an insertion hole and a large diameter part. For example, when the large-diameter portion is a regular hexagonal column, a curvature measuring instrument can be used in which the measurement piece 90 opens every 60 degrees.
Moreover, you may use shapes other than a polygon as an outer diameter of the large diameter part of an insertion hole and a rotating shaft member. In this case, at least when the curvature measuring device is closed (when the opening angle of each measuring piece is 0 degree) and when each measuring piece is rotated from the closed state to a predetermined angle to form a sector shape. An insertion hole is opened in such a shape that the rotation shaft member can be inserted into both sides. At this time, the shape of the insertion hole may be different for each measurement piece.

As described above, according to the present embodiment, the large-diameter portion of the rotating shaft member has a polygonal column shape, and the insertion hole of the measurement piece has a polygonal shape that matches the shape of the large-diameter portion. When the part is inserted, the rotation of the measurement piece can be prohibited, and the rotation of the base member supporting the measurement piece can also be prohibited.
In the present embodiment, the large-diameter portion of the rotating shaft member has a polygonal column shape, and the insertion hole has a polygonal shape, but at least one of the insertion hole and the shaft hole has a large-diameter portion of the rotating shaft member. Any polygonal shape can be used. In this case, when the rotation of at least one of the base member or the measurement piece is prohibited, the other rotation is also prohibited.
As described above, the present invention has been described based on each embodiment, but the present invention can be variously modified within the scope of the technical idea other than the above-described embodiment.

  DESCRIPTION OF SYMBOLS 1, 2, 3, 4 ... Curvature measuring instrument, 10 ... Base member, 11 ... Base board, 11a ... Guide surface, 13 ... Guide part, 15 ... Shaft hole, 17 ... Support belt, 20 ... Measuring piece, 20a ... Opposite Surface, 21 ... insertion hole, 23 ... slit, 25 ... scale, 27 ... string insertion hole, 29 ... guide string, 31 ... stopper, 40 ... rotating shaft member, 41 ... large diameter shaft member, 41a ... opening, 43 ... Small diameter shaft member, 45 ... knob part, 47 ... spring member, 50 ... rotating shaft member, 51 ... female screw part, 53 ... male screw part, 60 ... rotating shaft member, 61 ... large diameter part, 63 ... small diameter part , 65... Rotating shaft, 67... Knob section, 70... Base member, 71... Base plate, 73... Guide section, 75 ... Shaft hole, 80. ... Wing nut, 90 ... Measuring piece, 91 ... Insertion hole, 93 ... Slit, 95 ... Large diameter part

Claims (7)

A wire rod curvature measuring instrument having a plurality of base members, a measuring piece supported by each base member so as to be capable of moving forward and backward in the longitudinal direction, and a rotating shaft member,
Each of the base members includes a base plate having a guide surface facing one surface of each measurement piece, a guide portion provided on each base plate for guiding the measurement piece so as to freely advance and retract, and all the base plates Each having at least one shaft hole for penetrating the rotation shaft member formed through the same position,
Each of the measurement pieces includes insertion holes that communicate with the shaft hole in a process of moving back and forth along the base plate at predetermined multiple positions along the longitudinal direction of the measurement piece,
The rotating shaft member is inserted into the insertion hole and the shaft hole in a state in which the insertion holes provided in the same place of all the measurement pieces are in communication with the shaft hole, so that A curvature measuring instrument characterized in that the protruding length of the measuring piece is kept constant and all the measuring pieces are rotatable about the rotating shaft member. Each measurement piece includes a slit having a width smaller than the diameter of the insertion hole in order to communicate between the plurality of insertion holes.
The rotating shaft member has a large diameter portion having a diameter smaller than the inner diameter of the insertion hole and larger than the width of the slit, and a small diameter portion having a diameter smaller than the width of the slit. The curvature measuring device according to claim 1, wherein   The rotating shaft member has a hollow large-diameter shaft member that is aligned in the insertion hole and has an outer diameter larger than the slit width and has an opening at one end in the axial direction, and the large-diameter shaft member. 3. The curvature measuring instrument according to claim 2, comprising a small-diameter shaft member having a diameter that can be telescopically stored in the slit from one end opening and that can slide in the slit.   The curvature measuring instrument according to claim 2, wherein one end portion of the small diameter portion is connected to one end portion of the large diameter portion so as to be freely bent. Each measurement piece includes a slit having a width smaller than the diameter of the insertion hole in order to communicate between the plurality of insertion holes.
The rotating shaft member has a shaft portion having a diameter smaller than the inner diameter of the insertion hole and larger than the width of the slit,
The curvature measurement according to claim 1, wherein the measurement piece is configured such that a width of the slit is elastically changed in a process of sliding the rotation shaft member in the slit. vessel.   The curvature measuring device according to any one of claims 1 to 5, wherein a rotation angle limiting member that limits a maximum spread angle between the base members is attached to the base member.   The curvature measuring instrument according to any one of claims 2 to 5, wherein the insertion hole has a polygonal shape, and the large-diameter portion of the rotating shaft member is a polygonal column aligned with the insertion hole.

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