JPH076704U - Circular tube center indicator - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a circular pipe center indicating device, and accurately and simply finds the positions of the central axes of various circular pipes ranging from small diameters to large diameters. [Structure] A device main body 11 arranged at a distance in the vicinity of a circular pipe P, two leg portions 12 and 13 provided on both side faces thereof to be in contact with the circular pipe P, and a flat plate-shaped center indicating means 15.
And the leg portions 12 and 13 are provided with linear contact portions 20a and 21a, respectively, which are smaller than the diameter of the circular pipe P and are in parallel contact with the surface of the circular pipe P with a parallel interval therebetween. The means 15 includes the contact portions 20a, 2 of the both leg portions 12, 13.
It is arranged in a plane that is orthogonal to the plane including 1a and is arranged at the central position of both contact portions 20a and 21a. Is arranged in a plane including the central axis C of the circular pipe P to indirectly indicate the central axis C.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe having a circular cross section used in various plants, that is, a circular pipe center indicating device for indicating the central axis of a circular pipe.

[0002]

[Prior art]

 Circular pipes used in various plants must have their central axes accurately determined in order to realize the piping path as designed, or to mount various equipment or various structural members on the surface in a positioned state. There is. Conventionally, as a method of determining the central axis of a circular pipe, as shown in FIG. 3, an L-shaped curved scale 1 and a ruler 2 are applied to the surface of the circular pipe P, and the circular pipe P is sandwiched between them. After reading the diameter dimension of P, the diameter dimension is divided into two equal parts and the position of the central axis C of the circular pipe P is measured.

[0003]

[Problems to be solved by the device]

 In order to obtain the position of the central axis C of the circular pipe P by the above method, at least the straight scale portion 1a longer than the radial dimension of the circular pipe P and the straight scale portion 1b longer than the diameter dimension of the circular pipe P are provided. Tape measure 1 is required. However, when the diameter dimension of the circular pipe P is large, for example, when the position of the central axis C of the circular pipe P having a diameter of 5 m is obtained, the bending scale 1 having a dimension corresponding to this, that is, 2. It is unrealistic because it is necessary to prepare a curved scale 1 having a straight scale portion 1a of 5 m or more and a straight scale portion 1b of 5 m or more. Moreover, in the measurement for operating such a measuring tape 1, the larger the diameter of the circular pipe P, the more the perpendicularity between the ruler 2 and the measuring tape 1, the perpendicularity between the measuring tape 1 and the central axis C of the circular pipe P, and the like. It is difficult to set accurately. Therefore, there is a problem that sufficient measurement accuracy cannot be obtained.

The present invention has been made in view of the above circumstances, and it is possible to accurately and easily find the position of the central axis C of various circular pipes P ranging from a small diameter to a large diameter. It is intended to provide a circular tube center pointing device.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention proposes the following three means. A first means is a device main body which is arranged in the vicinity of a circular pipe with a space therebetween, two legs provided on both side surfaces of the device main body and brought into contact with the circular pipe, and attached to the device main body. And a linear contact portion that is arranged at a parallel interval smaller than the diameter of the circular pipe and is in linear contact with the surface of the circular pipe. Proposed is a circular tube center pointing device in which each of the center pointing means is arranged in a plane that is orthogonal to the plane including the contact portions of both legs and is arranged at the center position of both contact portions. According to the second means, in the circular tube center indicating device of the first means, both legs are attached to the device body so as to be movable in the interval direction of the abutting part, and both legs are equidistant in opposite directions. Proposed a circular tube center pointing device with moving leg moving means According to the third means, in the circular tube center indicating device of the first and second means, a circular tube center indicating device in which a level is arranged parallel to a plane including both abutting parts is provided in the main body of the device. Proposing a device.

[0006]

[Action]

 According to the circular pipe center pointing device according to the first means of the present invention, since the two legs are arranged with their contact portions spaced by a parallel distance smaller than the diameter of the circular pipe, both legs are arranged. The abutting parts of the parts are simultaneously brought into contact with the surface of the circular pipe. At this time, if the linear contact part is placed so as to make line contact with the surface of the circular pipe, the device body will be positioned with the corresponding contact part along the central axis of the circular pipe. To be done. In this case, the distance between the two abutting parts in contact with the surface of the circular pipe and the central axis of the circular pipe becomes equal, and the two abutting parts are orthogonal to the plane including these abutting parts. The plane passing through the center of will also include the central axis of the tube. By arranging the center indicating means in this plane, the center indicating means formed in a flat plate displays a plane including the center axis, and indirectly indicates the center axis of the circular pipe. Become. Further, according to the circular tube center indicating device according to the second means, by operating the leg moving means, both legs can be moved in the opposite direction by equal distances along the spacing direction of the contact portions. As a result, the abutting portions of the leg portions can change their interval size in accordance with the diameter of the circular pipe whose central axis is to be indicated, while maintaining the parallel state. In addition, by moving the legs in the opposite direction by equal distances, the center indicating means is held at the center position of the contact part, and the center axis of the circular pipe is also adjusted by the contact part whose distance dimension is changed. It becomes possible to instruct. Further, according to the circular pipe center indicating device according to the third means, when the circular pipe is arranged in a horizontal state, the spirit level arranged in parallel to the plane including both abutting portions shows the horizontal state. By arranging the device main body in the position, the center indicating means is arranged in the vertical plane including the central axis of the circular pipe. As a result, the central axis of the circular pipe when viewed from above in the vertical direction is indicated by the circular pipe center indicating device.

[0007]

【Example】

 An embodiment of the circular tube center indicating device according to the present invention will be described below with reference to FIGS. 1 and 2. In each of these drawings, reference numeral 10 is a circular tube center indicating device, 11 is an apparatus main body, 12 and 13 are legs, 14 is a leg moving means, 15 is a center indicating plate (center indicating means), 16 is a level, and 17 Is a fixing means, 18 is an insertion hole, 19 is a pinion gear, 20 and 21 are rectangular flat plate portions, 20a and 21a are abutting portions, 22 and 23 are sliding portions, and 22a and 23a are rack gears.

The circular tube center indicating device 10 of the present embodiment is a device for indicating the position of the central axis C of the circular pipe P arranged in a horizontal state, and as shown in FIG. 1, it has a flat rectangular parallelepiped shape. On the device body 11 formed in a box shape, two leg portions 12 and 13 that are brought into contact with the surface of the circular pipe P, leg portion moving means 14 that moves the leg portions 12 and 13, and a center indicator plate 15. And a fixing means 17 which is attached to the legs 12 and 13 and which fixes the apparatus main body 11 to the circular pipe P.

As shown in FIG. 2, the device body 11 has two parallel insertion holes 18 into which the sliding parts of the legs 12 and 13 described later are slidably inserted. The opposite side surface 11a is formed in a communicating state. A pinion gear 19 that is meshed with a rack gear of a sliding portion, which will be described later, is rotatably mounted in the apparatus main body 11 arranged in the middle of the insertion hole 18.

Each of the leg portions 12 and 13 has a rectangular flat plate portion 20 and 21 whose one side is in contact with the surface of the circular pipe P, and a rectangular flat plate portion 2 that is orthogonal to the rectangular flat plate portions 20 and 21. 0.21 and strip-shaped sliding portions 22 and 23 formed integrally with each other are formed into a member having an L-shaped cross section as a whole.

In the rectangular flat plate portion 20.21, one side that is brought into contact with the surface of the circular pipe P is a contact portion 20a.21a, and the sliding portion 22. Has 23. Further, the rectangular flat plate portions 20 and 21 are formed with notch holes 20b and 21b at their central positions so that a fixing means described later can be attached thereto.

The sliding portions 22 and 23 are formed in a strip plate shape having a width dimension of about 1/3 of the contact portions 20a and 21a of the rectangular flat plate portions 20 and 21, and one side along the longitudinal direction thereof. The rectangular flat plate portions 20 and 21 are arranged flush with one side orthogonal to the contact portions 20a and 21a. Rack gears 22a and 23a are formed on the other side along the longitudinal direction.

The leg portions 12 and 13 thus formed have the same shape as each other, and the sliding portions 22 and 23 are inserted into the insertion holes 18 of the apparatus main body 11 by The rack gears 22a and 23a of the sliding portions 22 and 23 and the rectangular flat plate portions 20 and 21 are attached to the apparatus main body 11 in a state of facing each other with a parallel interval. At this time, by simultaneously engaging the rack gears 22a and 23a of both the sliding portions 22 and 23 with the pinion gear 19 of the apparatus body 11, the rectangular flat plate portions 20 of the two legs 12 and 13 with respect to the center of the apparatus body 11.・ 21 can be placed equidistantly.

The leg moving means 14 is composed of rack gears 22 a and 23 a of the sliding portions 22 and 23 and a pinion gear 19 of the apparatus main body 11. As a result, by moving one leg 12 (13) with respect to the apparatus main body 11, the other leg 13 (12) meshing with the same pinion gear 19 moves in the opposite direction by the same distance. It can be moved. Further, a female screw portion 11d which penetrates the upper face 11b to the insertion hole is provided on the upper face 11b of the apparatus body 11, and a set screw 11e is screwed into the female screw portion. The movement of the sliding portions 22 and 23 is fixed by pressing the tip of the set screw 11e against the upper surface of the sliding portion 22 on one side, and the rectangular flat plate portions 20 and 21 of the two leg portions 12 and 13 are fixed. Can be held at the set spacing dimension.

The center indicating plate 15 is a thin plate-like plate which is arranged on the upper surface 11b of the apparatus main body 11 at right angles to the upper surface 11b and parallel to the rectangular flat plate portions 20 and 21 of the leg portions 12 and 13. The central axis C of the circular pipe P can be indirectly indicated on the extension surface of the central indicating plate 15 by being arranged in a plane including the central axis C of the circular pipe P. You can do it.

The level 16 is attached to the upper surface 11 b of the apparatus body 11 by, for example, being magnetically attached. Here, the upper surface 11a of the device main body 11 and the plane including the contact portions 20a and 21a of the rectangular flat plate portions 20 and 21 of the both leg portions 12 and 13 are arranged in a horizontal state, and the level 16 is The plane including the contact portions 20a and 21a can be set horizontally.

The fixing means 17 is, for example, a rubber band 17a wound around the circular pipe P, and hooks 17b attached to both ends thereof are attached to the rectangular flat plate portions 20 and 21 of the leg portions 12 and 13, respectively. The device main body 11 can be fixed to the circular pipe P by hooking on the formed notch holes 20b and 21b.

In order to display the central axis C of the circular pipe P by using the circular pipe center indicating device 10 configured as described above, first, the diameter of the circular pipe P on which the circular pipe center indicating device 10 is installed is set to In addition, the distance between the rectangular flat plate portions 20 and 21 of the leg portions 12 and 13 is adjusted. It is preferable that the distance dimension is smaller than the diameter dimension of the circular tube P and is as large as possible in a range in which the bottom surface 11c of the apparatus body 11 does not contact the surface of the circular tube P 1. The distance dimension is adjusted by actuating the leg moving means 14, that is, by pushing or pulling the leg portions 12 and 13 on one side or both sides. Since both leg portions 12 and 13 have rack gears 22a and 23a which mesh with the same pinion gear 19, they are always moved by the same distance by the above operation. As a result, the center indicating plate 15 is always held at the center position of both rectangular flat plate portions 20 and 21. Then, in this state, by fastening the set screw 11e to the female screw portion 11d, the sliding portion 22 is pressed by the tip thereof to fix the movement of both leg portions.

Next, the contact portions 20a and 21a of both rectangular flat plate portions 20 and 21 are brought into line contact with the surface of the circular pipe P. The abutting portions 20a and 21a are one side of the rectangular flat plate portions 20 and 21 and are formed in a straight line shape. Therefore, when the abutting portions 20a and 21a are linearly contacted with each other, the abutting portions 20a and 21a are parallel to the central axis C of the circular pipe P 1. The device main body 11 is uniquely positioned at that position. In this state, the abutting portions 20a and 21a are arranged equidistant from the central axis C of the circular pipe P, are perpendicular to the plane including the abutting portions 20a and 21a, and are abutting portions 20a and 21a. The center indicating plate 15 arranged at the center position of is arranged in a plane including the central axis C of the circular pipe P.

After that, while looking at the level 16, the entire circular tube center indicating device 10 is moved in the circumferential direction of the circular tube P. Then, the circular tube center indicating device 10 is fixed to the circular pipe P by the fixing means 17 at a position where the upper surface 11b of the device body 11 is horizontal.

As a result, the center indicator plate 15 attached to the upper surface 11b of the apparatus body 11 is arranged in the vertical plane, and the center indicator plate 15 has a vertical plane including the central axis C of the circular pipe P. Will be displayed. As a result, the worker can indirectly recognize that the central axis C of the circular pipe P is arranged vertically below the extension surface of the central indicating plate 15, and thus the circle The arrangement of the pipe P and the arrangement of various devices and structures attached to the circular pipe P can be accurately performed.

As described above, according to the circular pipe center pointing device 10 of the present embodiment, the circular pipes P having various diameters can be formed by adjusting the distance between the rectangular flat plate portions 20 and 21 of the leg portions 12 and 13. When applied, it has an effect that the position of the central axis C can be accurately indicated. Moreover, since the leg moving means 14 is configured to always move the both leg portions 12 and 13 in the opposite directions by the same distance, the operator can move the center indicator plate 15 and the rectangular flat plate portion 20 of the leg portions 12 and 13 It is possible to easily apply the circular pipe center indicating device 1 1 to circular pipes P having different diameters by adjusting only the distance between the rectangular flat plate portions 20 and 21 without paying attention to the positional relationship with the circular pipes 21. it can. Further, since the vertical plane including the central axis C of the circular pipe P is displayed by the level 16, it is possible to accurately recognize the central axis C position of the circular pipe P given by the plan view, for example, at the time of piping work. There is an advantage that can be done. As a result, the worker can easily carry out the piping work, and the working man-hour can be greatly reduced.

The circular tube center indicating device 10 according to the present invention can employ the following techniques. Although the legs 12 and 13 can be moved with respect to the device body 11, instead of this, the device body 11 and the legs 12 and 13 are integrally formed into a U-shaped member. thing. Although the leg moving means 14 has a structure composed of the rack gears 22a and 22b and the pinion gear 19, other interlocking means should be adopted instead. Although the circular pipe center indicating device 10 is arranged on the upper part of the circular pipe P arranged in a horizontal state, instead, it may be arranged on the lower part of the circular pipe P or other portions. Although it is applied to the circular pipe P arranged in the horizontal state, instead of this, it is displayed on the position of the central axis C of the circular pipe P arranged in the vertical state or the circular pipe P arranged in the inclined state. Apply.

[0024]

[Effect of device]

 As described above in detail, the circular pipe center indicating device according to the first means of the present invention is provided on both sides of the device main body, which is arranged in the vicinity of the circular pipe with a space therebetween, and contacts the circular pipe. Two leg portions and a flat center indicating means are provided, and the leg portion is provided with a linear contact portion which is smaller than the diameter of the circular pipe and is in parallel contact with the surface of the circular pipe at a parallel interval. Since each of the center indicating means is provided in the plane that is orthogonal to the plane including the contact portions of both legs and is arranged at the central position of both contact portions, the contact portions are not By merely making line contact with the surface, the center indicating means can be arranged in a plane including the center axis, and the center axis of the circular pipe can be easily and accurately indicated. Further, the circular pipe center pointing device according to the second means of the present invention is such that both legs are movably attached to the main body of the device in the interval direction of the abutment parts, and both legs are moved in the opposite direction by equal distance. Since the leg moving means is provided, in addition to the effect of the first means, it is possible to adjust the distance between the contact portions of both legs and apply it to a circular pipe of any diameter. Play. In addition, in the circular pipe center indicating device according to the third means of the present invention, since the spirit level is arranged parallel to the plane including both contact portions in the device body, in addition to the above effects, the central axis It is possible to display a vertical plane as a plane for indicating the pipe, and it is possible to improve the accuracy of the pipe and the efficiency of the pipe work by effectively using the center axis position of the pipe given by the plan view. Play.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a circular tube center pointing device according to the present invention.

FIG. 2 is a vertical cross-sectional view showing leg moving means of the circular tube center indicating device of FIG.

FIG. 3 is a conceptual diagram showing a conventional example of a method of indicating the center of a circular pipe.

[Explanation of symbols]

 P circular pipe C central axis 10 circular pipe center indicating device 11 device body 12/13 leg part 14 leg moving means 15 center indicating plate (center indicating device) 16 level 17 fixing means 18 insertion hole 19 pinion gear 20/21 rectangular flat plate Part 20a / 21a Contact part 22/23 Sliding part 22a / 23a Rack gear

Claims (3)

[Scope of utility model registration request] 1. A device main body which is arranged in the vicinity of a circular pipe with a space therebetween, two legs provided on both side surfaces of the device main body and brought into contact with the circular pipe, and a flat plate attached to the device main body. -Shaped center indicating means, and each of the leg portions is provided with a linear contact portion which is smaller than the diameter of the circular pipe and is arranged at a parallel interval and is in line contact with the surface of the circular pipe. The center indicating means is arranged in a plane orthogonal to a plane including the contact portions of both legs and arranged in a central position of both contact portions. 2. The apparatus main body is provided with both legs movably in the interval direction of the contact portion, and leg moving means for moving the legs in opposite directions by equal distances. The circular tube center pointing device according to claim 1. 3. The circular tube center pointing device according to claim 1, wherein a level is provided in the device main body in parallel with a plane including both abutting portions.