Marking stick

Abstract

To provide a marking rod which makes it easy to perform marking even when the expansion rod is extended.SOLUTION: The marking rod has an expansion portion 2 which is formed by combining a plurality of expansion units 20 which are straight pipes. The expansion portion 2 can store the plurality of expansion units 20 in a radially overlapping manner, and can expand and contract along the axis as each of the plurality of expansion units 20 is stored and pulled out, and has a marking member M which can be attached and detached to the tip and which can perform marking, and has a reinforcing portion 5 which extends in the axial direction of the expansion portion 2 and suppresses bending in the axial direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a marking stick to which a member capable of marking, such as chalk, is attached. [Background technology]

[0002] Conventionally, an extension rod that points to a point on a diagram or the like is known (Non-Patent Document 1). This extension rod is configured so that a combination of a large-diameter straight pipe and a small-diameter straight pipe is stored in a radially overlapping manner, and each stored straight pipe can be pulled out in the axial direction in sequence. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] "OPEN Industrial (OPEN) OP Pointer PT-150 1 piece 808-1906 (direct delivery product) - Askul, [Retrieved January 30, 2024], Internet <URL: https: / / www.askul.co.jp / p / P398998 / >" Summary of the Invention [Problem to be solved by the invention]

[0004] In some cases, it may be desirable to attach a marking device such as chalk to the tip of such an extendable rod and mark an object (such as a wall or ceiling of a building) located far from the worker to indicate a construction position or show a symbol. However, in this case, the extendable rod is prone to bending when extended, and the position of the tip of the extendable rod shifts depending on the bending, making it difficult to mark.

[0005] The present invention aims to provide a marking rod that allows easy marking even when the telescopic rod is extended. [Means for solving the problem]

[0006] The marking rod of the present invention has an extension section formed by combining multiple extension units which are straight tubes, and the extension section can store multiple extension units in a radially overlapping manner, and can extend and contract along the axis as each of the multiple extension units is stored and pulled out, and has a marking member that can be attached and detached to the tip and can perform marking, and has a reinforcing section that extends in the axial direction and suppresses axial bending of the extension section.

[0007] With this configuration, the reinforcing portion suppresses deflection of the telescopic portion when it is extended, making it difficult for the tip of the telescopic portion to shift position, making it easy to perform marking even when the telescopic rod is extended.

[0008] In the marking stick, the reinforcing portion may be a groove or a protrusion integrally formed on the outer surface of each of the plurality of extension units.

[0009] According to this configuration, the configuration of the reinforcing portion is simplified.

[0010] In addition, in the marking rod, when the telescopic unit parts are extended, the extension state of the telescopic unit parts adjacent to each other in the axial direction is fixed by friction generated between a portion of the outer surface of one telescopic unit part and a portion of the inner surface of the other telescopic unit part, and the magnitude of the friction may be greater than or equal to the magnitude that can withstand the force that the marking member receives from the object to be marked when marking is performed.

[0011] According to this configuration, the stretched state of the stretchable portion is fixed by the friction generated in the stretchable portion, so that the stretchable portion does not unintentionally contract when marking is performed.

[0012] The marking rod may also be a holder for holding a columnar marking member, and may include a holder having a first member and a second member that are attached to the tip of the extendable portion by screwing, wherein the first member clamps the marking member from the radially outer direction, and the second member is screwed into the first member, thereby holding the marking member in a clamped state.

[0013] According to this configuration, by attaching or detaching the second member to or from the first member, the state in which the first member sandwiches the marking member can be maintained or released, making it easy to attach or detach the marking member from the holder. [Effects of the Invention]

[0014] As described above, according to the present invention, a marking rod that makes it easy to mark even when the telescopic rod is extended can be provided. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a front view of the marking stick according to this embodiment. [Figure 2] FIG. 2 is a side view of the marking stick. [Figure 3] FIG. 3 is a front view of the marking stick in the middle of being extended. [Figure 4] FIG. 4 is an exploded perspective view of the marking stick. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] A marking stick according to an embodiment of the present invention will be described below with reference to Figures 1 to 6. This marking stick is used, for example, at a construction site, when marking an object (such as a wall or ceiling surface of a building) located at a distance from a worker.

[0017] As shown in Figures 1 to 3, the marking stick 1 has an extendable part 2. A marking member M capable of performing marking can be attached to the tip 21 of the extendable part 2. The marking stick 1 also has a holder 3 that holds the marking member M. Furthermore, the marking stick 1 has a cover 4 provided on the base end side of the extendable part 2. The marking stick 1 may be sold alone or as a set with the marking member M.

[0018] The marking member M is columnar, specifically, a piece of chalk housed in a cylindrical case. This chalk is commercially available, so even if it wears out, new pieces can be easily obtained at the work site. The marking member M may also be a pen, brush, or small spray used for marking with ink, or a tape holder used for marking with tape.

[0019] As shown in Figure 3, the extension section 2 is configured by combining multiple extension units 20, which are straight pipes. In this embodiment, the extension section 2 is a straight pipe, specifically, cylindrical in shape. The extension section 2 can be stored with multiple extension units 20 overlapping in the radial direction (see Figures 1, 2, and 6). Furthermore, the extension section 2 can be extended and retracted along the axis of the extension section 2 as each extension unit 20 is retracted and pulled out.

[0020] As shown in Figure 4, the telescopic section 2 has a reinforcing section 5 that extends in the axial direction of the telescopic section 2 and suppresses bending in the axial direction. With this configuration, the reinforcing section 5 suppresses deflection of the telescopic section 2 when it is extended, so the position of the tip 21 of the telescopic section 2 is less likely to shift, making it easier to perform marking even when the telescopic rod is extended.

[0021] In this embodiment, the extension / contraction section 2 is an extendable rod body composed of six extension / contraction units 201, 202, 203, 204, 205, and 206. The number of extension / contraction units 20 constituting the extension / contraction section 2 may be more than one, and may be two to five or seven or more extension / contraction units 20.

[0022] The tip 21 of the expandable part 2 is formed by the tip part of the expandable unit part 201 that is located closest to the tip when the expandable part 2 is extended. A threaded part 210 is provided on the outer peripheral surface of the tip 21 of the expandable part 2.

[0023] The reinforcing portions 5 are grooves provided on the outer surface of each of the multiple extension units 20. With this configuration, the reinforcing portions 5 are formed as grooves, which simplifies the configuration of the marking stick 1. The reinforcing portions 5 can be formed, for example, at the same time as the extension units 20 are extrusion molded.

[0024] The grooves that form the reinforcing portions 5 are formed linearly along the axial direction. However, for aesthetic reasons, these grooves may also be formed linearly and curved along the axial direction. For example, these grooves may be formed spirally on the outer surface of the stretchable portion 2. However, when the reinforcing portions 5 are grooves, linear grooves are most effective in suppressing bending of the stretchable portion 2 in the axial direction.

[0025] In this embodiment, the grooves that are the reinforcing parts 5 have a uniform width at any position in the axial direction of the expandable part 2, but may have a non-uniform width. In this embodiment, the grooves of each expandable unit part 20 are formed at positions that overlap each other in the radial direction when the expandable part 2 is stored (see FIG. 6).

[0026] Furthermore, since two grooves, which are reinforcing portions 5, are formed at 180-degree intervals in the circumferential direction, the stretchable portion 2 is less likely to bend than a configuration with one groove. Also, since the grooves are formed at equal intervals in the circumferential direction, the stretchable portion 2 is less likely to bend in the circumferential direction.

[0027] The reinforcing portion 5 may be something other than a groove, and may be, for example, a protrusion integrally provided on the outer surface of each of the multiple extension unit portions 20. The protrusion that is the reinforcing portion 5 may be a ridge formed linearly along the axial direction of the extension portion 2. Note that this ridge may also be formed linearly curved along the axial direction of the extension portion 2.

[0028] The extension unit 20 has a unit main body 22 and a cap 23 provided at the tip of the unit main body 22 (see FIG. 4). Note that the extension unit 20 does not necessarily have to have the cap 23, and may be composed of only the unit main body 22.

[0029] The unit main body 22 is a straight pipe, specifically a cylindrical member. The unit main body 22 is made of light metal, and in this embodiment, is made of aluminum alloy. This makes the telescopic section 2 lighter, reducing the burden on the worker when marking.

[0030] In this embodiment, the axial lengths of the extension units 20 are the same, but may be different. The thicknesses of the unit main bodies 22 are the same, but may be different. The grooves, which are the reinforcing parts 5, are formed on the outer surfaces of the unit main bodies 22.

[0031] Furthermore, grooves serving as reinforcing portions 5 are interposed in the unit main body portion 22 so as to be sandwiched between the arc-shaped portions in the circumferential direction. This creates a corner at the boundary between the arc-shaped portions of the unit main body portion 22 and the reinforcing portions 5 (FIG. 6). The corner at this boundary adds strength to the unit main body portion 22.

[0032] The cap 23 is an annular cap that protects the tip of the unit main body portion 22. The cap 23 is made of resin.

[0033] In the marking stick 1 described above, for the extension units 20, 20 adjacent in the axial direction during extension, the extension state of the extension unit 2 is fixed by friction generated between a part of the outer surface of one extension unit 20 and a part of the inner surface of the other extension unit 20 (specifically, the inner surface of the cap 23). For example, for the fifth and sixth extension units 205, 206 located from the tip, the extension states of the fifth and sixth extension units 205, 206 are fixed by friction generated between a part of the outer surface 2050 of one extension unit 205 and a part of the inner surface 2060 of the other extension unit 206. For other extensions, the extension states of the extension units 20, 20 adjacent in the axial direction are also fixed by similar friction.

[0034] As described above, in the marking stick 1, the extension state of the extension part 2 is fixed by friction, so the extension state can be fixed even when the extension unit 20 is pulled out partway. Therefore, the marking stick 1 has a high degree of freedom in the extension length of the extension part 2 compared to a configuration in which the extension unit 20 cannot be fixed unless it is fully pulled out by a stopper. Furthermore, in this marking stick 1, compared to conventional configurations in which the extension part 2 is fixed by rotating and tightening the shafts together or configurations in which a clamp is provided, no additional operation in addition to the extension operation is required to fix the extension state of the extension part 2.

[0035] Furthermore, for the axially adjacent extension units 20, 20 during extension, the magnitude of friction generated between a portion of the outer surface of one extension unit 20 and a portion of the inner surface of the other extension unit 20 is equal to or greater than the magnitude with which the marking member M can withstand the force received from the marking object when marking is performed. For example, for the axially adjacent extension units 205, 206 during extension, the magnitude of friction generated between a portion of the outer surface 2050 of one extension unit 205 and a portion of the inner surface 2060 of the other extension unit 206 is equal to or greater than the magnitude with which the marking member M can withstand the force received from the marking object when marking is performed. The magnitude of similar friction between the axially adjacent extension units 20, 20 during other extensions is also equal to or greater than the magnitude with which the marking member M can withstand the force received from the marking object when marking is performed.

[0036] According to this configuration, the stretched state of the stretchable portion 2 is fixed by the friction generated in the stretchable portion, so that the stretchable portion 2 does not unintentionally contract when marking is performed.

[0037] In this embodiment, for the extension units 20, 20 adjacent in the axial direction during extension, friction occurs between a part of the outer surface of the unit main body 22 of one extension unit 20 and a part of the inner surface of the resin cap 23 of the other extension unit 20. Therefore, the magnitude of this friction is easy to adjust. In particular, in this embodiment, friction occurs in the cap 23, so the magnitude of friction can be easily adjusted by changing the cap 23.

[0038] The holder 3 is a member attached to the tip 21 of the expandable part 2 (see FIG. 3). In this embodiment, the holder 3 has a first member 31 that is attached to the tip 21 of the expandable part 2 and that sandwiches the marking member M, and a second member 32 that is attached to the tip of the first member 31.

[0039] The first member 31 is cylindrical and made of resin (see FIG. 4). The first member 31 includes a distal end portion 310 and a proximal end portion 311.

[0040] The distal end portion 310 of the first member 31 is generally cylindrical and tapered toward the distal end, and is composed of a plurality of pieces 312, specifically four pieces 312, arranged with gaps in between in the circumferential direction. Each piece 312 is a flexible plate and can be deformed to expand radially outward. An outer thread portion 313 is provided on the outer peripheral surface of the base end portion of the distal end portion 310 of the first member 31.

[0041] The base end portion 311 of the first member 31 is cylindrical with a uniform diameter. An inner thread portion 314 is provided on the inner circumferential surface of the base end portion 311.

[0042] The first member 31 is attached to the tip 21 of the extendable unit 2 by screwing (see FIGS. 4 and 5). Specifically, the first member 31 is attached to the tip 21 of the extendable unit 2 by threading the inner thread portion 314 of the first member 31 into the thread portion 210 of the extendable unit 201 located closest to the tip.

[0043] Furthermore, the first member 31 holds the marking member M from the radially outer direction. Specifically, when the marking member M is pushed into the tip portion 310 of the first member 31, the four pieces 312 hold the marking member M from the radially outer direction. In this embodiment, the protruding length of the marking member M from the holder 3 can be adjusted by the degree to which the marking member M is pushed into the first member 31. For example, when the marking member M becomes shorter due to use, the marking member M can be pulled out from the first member 31 as appropriate.

[0044] The second member 32 is cylindrical and made of resin. An inner threaded portion 320 is provided on the inner peripheral surface of the second member 32.

[0045] Furthermore, the second member 32 is a member that maintains or releases the state in which the first member 31 sandwiches the marking member M. Specifically, the inner thread portion 320 of the second member 32 threadably engages with the outer thread portion 313 of the first member 31, thereby pressing the piece portion 312 of the first member 31 from the radially outward direction, and the second member 32 maintains the state in which the first member 31 sandwiches the marking member M. Furthermore, by releasing the engagement of the inner thread portion 320 of the second member 32 with the outer thread portion 313 of the first member 31 from this state, the second member 32 releases the state in which the first member 31 sandwiches the marking member M.

[0046] In this way, by attaching and detaching the second member 32 to and from the first member 31, the state in which the first member 31 sandwiches the marking member M can be maintained or released, making it easy to attach and detach the marking member M from the holder 3.

[0047] The marking stick of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, or part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Furthermore, part of the configuration of one embodiment can be deleted.

[0048] In the above embodiment, two grooves serving as reinforcing portions 5 are formed at 180-degree intervals in the circumferential direction, but one, or three or more reinforcing portions 5 may be formed. Furthermore, when multiple reinforcing portions 5 are formed, they may be formed at equal intervals in the circumferential direction or at different intervals in the circumferential direction. [Explanation of symbols]

[0049] 1...marking rod, 2...extension part, 3...holder, 4...cover, 5...reinforcement part, 20...extension unit part, 21...tip, 22...unit main body part, 23...cap, 31...first member, 32...second member, 201, 202, 203, 204, 205, 206...extension unit part, 2050...outer surface, 2060...inner surface, 210...threaded part, 310...tip part, 311...base end part, 312...single part, 313...outer threaded part, 314, 320...inner threaded part, M...marking member

Claims

1. The telescopic section is configured by combining a plurality of telescopic units that are straight pipes, The stretchable portion is A plurality of the expansion and contraction units can be stored in a radially overlapping manner, The plurality of extension units are extendable and retractable along an axis as they are retracted and drawn out, A marking member capable of marking the tip can be attached and detached, The reinforcing portion suppresses bending of the stretchable portion in the axial direction and extends in the axial direction, Each of the plurality of expansion and contraction units has the reinforcing portion extending from an end portion to an intermediate portion in the axial direction.

2. The marking stick according to claim 1 , wherein the reinforcing portion is a groove or a protrusion integrally formed on the outer surface of each of the plurality of expansion units.

3. When the extension unit is extended, the extension state of the extension unit is fixed by friction generated between a part of the outer surface of one extension unit and a part of the inner surface of the other extension unit, for the extension unit parts adjacent in the axial direction, 3. The marking stick according to claim 1, wherein the magnitude of the friction is equal to or greater than the magnitude that resists the force that the marking member receives from the object to be marked when marking is performed.

4. a holder for holding a columnar marking member, the holder having a first member and a second member attached to a tip of the expandable portion by screws; The first member sandwiches the marking member from a radially outer direction, The marking stick according to claim 1 or 2, wherein the second member is screwed into the first member, thereby holding the marking member between the first member and the second member.

Images