Marking device

Abstract

To provide a marking device that can make a marking on an arbitrary position on an outer surface of a columnar member, accurately with good operability.SOLUTION: A marking device according to the present invention is constituted of a bifurcated main body 10 provided with leg parts 11 and 12 that can open and close with a pivot 13 as a center and marking members provided at tips of the leg parts. The marking members are rollers 20 and 21 or deformable printing surfaces, which can make a marking on the surface of a columnar member 30 by pressing tips of the leg parts against the surface.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a marking device used to apply markings to the outer surface of a columnar or cylindrical member (hereinafter referred to as a columnar member). [Background technology]

[0002] When installing cylindrical components such as metal pipes or plastic pipes, circumferential markings are often applied to the outer surface of the cylindrical components to clearly indicate fixing positions, joining points, etc. Although such markings can be done by hand, because the marking is done on a curved surface, mistakes are more likely to occur than when marking on a flat surface, and accuracy is also difficult to achieve.

[0003] Patent Document 1 proposes a device that can accurately mark the outer circumference of a pipe by attaching a marker pen to a pipe holder with a group of arc-shaped grooves into which the end of the pipe is inserted and rotating the pipe along the group of arc-shaped grooves. However, this device has problems such as a complex structure, being expensive, and requiring time for preparation, resulting in poor work efficiency. Another problem is that this device can only mark near the end of the pipe. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-152513 Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a marking device that is easy to operate and can accurately mark any position on the outer surface of a cylindrical member. [Means for solving the problem]

[0006] The marking device of the present invention, which has been made to solve the above problems, comprises a bifurcated main body with legs that can be opened and closed around a pivot, and marking members provided at the tip of each leg, and is characterized in that the marking members are rollers or deformable printing surfaces.

[0007] Preferably, the main body is provided with an elastic body that biases the legs so as to close the gap between them. The main body is preferably provided with an operating section that can adjust the spacing between the legs. It is also preferable that the main body has curved legs that can form an internal space when closed. [Effects of the Invention]

[0008] The marking device of the present invention can mark both sides of a cylindrical object by pressing the main body against the position to be marked on the cylindrical object and passing the cylindrical object between the marking members at the tip of the legs. Furthermore, by slightly rotating the main body at that position, marking can be performed on the entire circumference. This allows for quick and accurate marking of any position on a cylindrical object. Furthermore, the marking device of the present invention is lightweight, easy to carry, and can be operated with one hand, improving work efficiency. [Brief explanation of the drawings]

[0009] [Figure 1] 1A and 1B are a front view and a bottom view of a marking device according to an embodiment of the present invention; [Figure 2] 1A and 1B are front and bottom views of the device with the legs open. [Figure 3] FIG. 10 is a front view showing another embodiment. [Figure 4] FIG. [Figure 5] FIG. 10 is a perspective view showing the marked state. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present invention will be described below. Figure 1 shows a front view and a top view of a marking device according to an embodiment. The main body 10 of the marking device has two legs 11 and 12 whose upper portions are pivotally attached by a pivot 13 so as to be able to open and close. The two legs 11 and 12 are preferably made of resin or metal and have a substantially symmetrical shape. The portions of the two legs 11 and 12 below the pivot 13 are curved outward, so that when the device is closed as shown in Figure 2, a substantially circular or elliptical space 14 is formed inside.

[0011] An elastic body 15 is provided at the pivot 13 portion of the two legs 11, 12. In this embodiment, the elastic body 15 is a helical spring wound around the outer periphery of the pivot 13, and urges the legs 11, 12 in the closing direction as shown in Figure 2. However, the elastic body 15 is not necessarily limited to a helical spring, and a coil spring, rubber cord, or the like can also be used as long as it can urge the legs 11, 12 in the closing direction.

[0012] The upper ends of the two legs 11 and 12 above the pivot 13 are operation units 16 and 17 that can adjust the distance between the legs 11 and 12. In this embodiment, a slit-like space is formed inside these operation units 16 and 17, and the elastic body 15 described above is housed inside the operation units 16 and 17.

[0013] Marking members are provided at the tips of the two legs 11 and 12. In this embodiment, the marking members are small rollers 20 and 21 rotatably supported by shafts 18 and 19, and their peripheral surfaces are covered with porous rubber impregnated with marking ink.

[0014] However, the marking members may be deformable printing surfaces 22, 23 as shown in Fig. 3. These are elastically deformable porous rubber blocks impregnated with marking ink and are fixed to the inside of the tips of the two legs 11, 12. In either case, each marking member should be arranged on the same plane perpendicular to the pivot axis.

[0015] To perform marking using the marking device of the present invention configured as described above, the tips of the legs 11, 12 are brought into contact with the position on the columnar member 30 to be marked, as shown in Figure 4, and the main body 10 is then pressed toward the columnar member 30, causing the legs 11, 12 to open outward and allowing the columnar member 30 to pass into the internal space 14. During this time, stripe markings are made on both side surfaces of the columnar member 30 by the marking members, rollers 20, 21 or deformable printing surfaces 22, 23.

[0016] Although there will be unmarked portions on the top and bottom surfaces of the cylindrical member 30, by rotating the marking device slightly in a plane perpendicular to the axis of the cylindrical member 30, a complete, non-aligned circumferential marking 31 can be applied all around the cylindrical member 30, as shown in Figure 5.

[0017] As in this embodiment, if the legs 11 and 12 are biased in the closing direction by the elastic body 15, the marking member is pressed against the surface of the cylindrical member 30, so marking can be performed by the simple operation of simply pressing the marking device against the cylindrical member 30.

[0018] Furthermore, by operating the operating units 16, 17 according to the diameter of the cylindrical member 30, the degree to which the legs 11, 12 are opened can be optimally controlled. For example, if the diameter of the cylindrical member 30 is large, the operating units 16, 17 can be operated to open the legs 11, 12 slightly, making it easier for the cylindrical member 30 to pass between the marking members. Conversely, if the diameter of the cylindrical member 30 is small, the pressing force of the elastic body 15 may be insufficient, so it is possible to apply pressure to the marking members by pressing the outside of the legs 11, 12 with your fingers, thereby enabling clear marking.

[0019] The marking device of the present invention described above has the following advantages and is suitable for use in plumbing work on metal pipes, resin pipes, etc. (1) It is lightweight, easy to carry, and can be manufactured inexpensively. (2) Accurate markings can be made on the outer surface of the cylindrical member. (3) The position of the marking can be freely selected. (4) It can be operated with one hand and is easy to operate. [Explanation of symbols]

[0020] 10 Main Unit 11 Legs 12 Legs 13 Axis 14 Space 15 Elastic Body 16 Control section 17 Control section 18 axes 19 axes 20 Roller (marking material) 21 Roller (marking material) 22 Deformable marking surface (marking component) 23 Deformable marking surface (marking component) 30 Cylindrical member 31 Circumferential marking

Claims

1. A marking device comprising a bifurcated body with legs that can be opened and closed around a pivot, and marking members provided at the tip of each leg, wherein the marking members are rollers or deformable printing surfaces.

2. The marking device according to claim 1 , wherein the main body is provided with an elastic body that biases the legs so that the space between the legs closes.

3. 3. The marking device according to claim 1, wherein the main body is provided with an operating portion that can operate the spacing between the legs.

4. 3. The marking device according to claim 1, wherein the main body has curved legs that form an internal space when the main body is closed.

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