Scattering prevention device

Abstract

To provide a scattering prevention device capable of reducing the number of personnel and steps required for chipping work and further improving work efficiency.SOLUTION: A scattering prevention device (30) is attached to a hand breaker (20). The scattering prevention device (30) comprises: an annular holding portion (33) arranged so as to surround the hand breaker (20); a plurality of scattering prevention pieces (34) provided along a circumferential direction of the annular holding portion (33); and a mounting portion (31) holding and mounting the annular holding portion (33) at a position spaced from the hand breaker (20).SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a scattering prevention device, and more particularly to a scattering prevention device that prevents scattering of crushed pieces during chipping work when removing an asphalt mixture layer or a concrete slab. [Background technology]

[0002] Conventionally, when repairing roads and other pavements, existing asphalt mixture layers and concrete slabs are removed. For example, when cutting and removing the asphalt mixture layer on the surface of a highway pavement using a road milling machine, the asphalt mixture layer is cut across the road at the start and end points of the construction section using a paving cutter. The cutting work begins at the start point and ends at the end point. Because tapered asphalt mixture remains at the start and end points, which cannot be completely cut with the cutting rotor of the road milling machine, workers use hand breakers to crush and remove the remaining asphalt mixture. The same process applies when cutting asphalt mixture layers before and after concrete that protect bridge expansion joints. Furthermore, when cutting the asphalt mixture layer on a bridge's concrete deck slab, the unevenness of the deck leaves asphalt mixture behind, necessitating chipping of the remaining asphalt mixture.

[0003] In chipping work using a hand breaker, the tip of the vibrating hand breaker strikes the concrete surface, breaking up and removing the concrete. To prevent fragments of the broken concrete from scattering around and colliding with vehicles traveling in the open lane, fences are installed around the work area to prevent the scattering of fragments (see, for example, Patent Documents 1 and 2). A device for preventing scattering of fragments has also been proposed, in which a conical net is attached around the tip of the hand breaker (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3116513 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-162915 [Patent Document 3] Utility Model Registration No. 3202047 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the scatter prevention fences described in Patent Documents 1 and 2, the entire work area is surrounded by the scatter prevention fence in advance, and the chipping work is carried out within the area surrounded by the scatter prevention fence. In actual work sites, the scatter prevention fence is installed at the boundary with the used lane, so it is necessary to secure personnel to hold down the scatter prevention fence so that it does not fall onto the used lane due to a sudden gust of wind. Furthermore, every time the work area is changed, the scatter prevention fence needs to be repositioned, which increases the number of personnel and steps required for the work. Furthermore, because the personnel holding down the scatter prevention fence to prevent it from collapsing are located at the boundary with the used lane, it is necessary to limit the driving area of ​​the used lane to ensure safety from passing vehicles.

[0006] Furthermore, the device for preventing the scattering of broken fragments described in Patent Document 3 attaches a net only to the tip of the hand breaker, eliminating the need for personnel to prevent the scatter prevention fence from collapsing and making it easy to change the work area. However, the device for preventing the scattering of broken fragments described in Patent Document 3 uses a conical net that expands toward the ground, meaning the work area must be viewed from an angle relative to the mesh. This creates a problem: the tip of the hand breaker is blocked by the mesh from the worker's viewpoint, reducing visibility and reducing work efficiency. Another problem is that the net is less effective at preventing the scattering of broken fragments and dust smaller than the mesh.

[0007] Therefore, the present invention has been made in consideration of the above-mentioned conventional problems, and aims to provide a scattering prevention device that can reduce the number of personnel and steps required for chipping work and further improve work efficiency. [Means for solving the problem]

[0008] In order to solve the above problems, the anti-scattering device of the present invention is a anti-scattering device that is attached to a hand breaker, and is characterized by comprising an annular holding portion that is arranged around the periphery of the hand breaker, a plurality of anti-scattering pieces that are arranged circumferentially around the annular holding portion, and an attachment portion that holds and attaches the annular holding portion in a position spaced apart from the hand breaker.

[0009] In the anti-scattering device of the present invention, the anti-scattering pieces attached to the annular holding part prevent fragments from flying, but the attachment part holds the annular holding part at a position separated from the hand breaker, so that the working position on the road surface can be clearly seen from inside the annular holding part, reducing the number of personnel and processes required for chipping work and further improving work efficiency.

[0010] In one aspect of the present invention, the annular holding portion is spaced 10 cm or more from the position where the attachment portion is attached to the hand breaker.

[0011] In one aspect of the present invention, the anti-scattering piece extends downward beyond the tip of the hand breaker.

[0012] In one aspect of the present invention, the shatter prevention piece is made of a flexible resin material.

[0013] In one aspect of the present invention, a plurality of the anti-scattering pieces are arranged in an overlapping manner in the width direction of the annular holding portion.

[0014] In one aspect of the present invention, an opening is provided between the annular holding portion and the mounting portion. [Effects of the Invention]

[0015] The present invention can provide a scattering prevention device that can reduce the number of personnel and steps required for chipping work and further improve work efficiency. [Brief explanation of the drawings]

[0016] [Figure 1] 3 is a schematic diagram showing an example of chipping work using the scattering prevention device 30 according to the first embodiment. FIG. [Figure 2] 1 is a schematic perspective view showing an example in which a scattering prevention device 30 is attached to a hand breaker 20. FIG. [Figure 3] 3A and 3B are schematic diagrams showing the structure of a scattering prevention device 30 attached to a hand breaker 20, with FIG. 3A being a schematic cross-sectional view and FIG. 3B being a schematic top view. [Figure 4] 3 is a schematic cross-sectional view showing the state of the scattering prevention device 30 when the hand breaker 20 is in use. FIG. [Figure 5] 10 is a schematic diagram showing the structure of a scattering prevention device 30 according to a second embodiment. FIG. [Figure 6] 10 is a schematic diagram showing the structure of a scattering prevention device 30 according to a third embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] (First embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in each drawing will be given the same reference numerals, and duplicate explanations will be omitted where appropriate. FIG. 1 is a schematic diagram showing an example of chipping work using a scattering prevention device 30 according to this embodiment. As shown in FIG. 1, a worker 10 attaches the scattering prevention device 30 to a hand breaker 20 and operates the hand breaker 20 on a road surface G to perform chipping work.

[0018] The worker 10 is a person who operates a hand breaker 20 on the road surface G to perform chipping work to remove an existing asphalt mixture layer on the road surface G. The hand breaker 20 is a device that converts energy from a power source into vibrations and impacts to oscillate the tip of a chisel 25 (described later) and perform chipping work on an object against which the tip of the chisel 25 is abutted. The scattering prevention device 30 is attached to the hand breaker 20 and covers the periphery of the hand breaker 20, preventing fragments generated by the chipping work from scattering far away. A detailed description of the scattering prevention device 30 will be given later.

[0019] As will be described later, an opening 35 is provided between the scattering prevention device 30 and the hand breaker 20. Therefore, the worker 10 can look down at the road surface G from above the hand breaker 20 and continue working while checking the tip of the hand breaker 20. As a result, the scattering prevention device 30 of this embodiment can reduce the number of personnel and steps required for chipping work, and further improve work efficiency.

[0020] FIG. 2 is a schematic perspective view showing an example of a scattering prevention device 30 attached to a hand breaker 20. FIG. 3 is a schematic diagram showing the structure of the scattering prevention device 30 attached to the hand breaker 20, with FIG. 3(a) being a schematic cross-sectional view and FIG. 3(b) being a schematic top view. As shown in FIGS. 2 and 3, the hand breaker 20 includes a handle portion 21, a main body portion 22, a cylinder portion 23, a chisel holder 24, and a chisel 25. The scattering prevention device 30 also includes an attachment portion 31, an arm portion 32, an annular holding portion 33, a scattering prevention piece 34, and an opening 35. The structure of the hand breaker 20 shown in FIG. 2 is one example, and the structure and type of the hand breaker 20 are not limited.

[0021] The handle 21 is the part with which the operator 10 holds the hand breaker 20. There are no specific limitations on the structure or function of the handle 21, and as an example, it may be in the shape of a rod extending horizontally on both sides from the top of the main body 22. The handle 21 may also be provided with a throttle lever (not shown) or a switch (not shown) for controlling the swing of the hand breaker 20.

[0022] The main body 22 is a part that holds the components of the hand breaker 20, and has the handle 21 at its top and the cylinder 23 at its bottom. The main body 22 may also house a control unit that controls the operation of each component in response to control signals input from the handle 21, etc.

[0023] The cylinder portion 23 is provided at the bottom of the main body portion 22 and converts energy such as electricity supplied from the main body portion 22 into vibration and impact, and transmits the kinetic energy such as vibration and impact to the chisel holder 24 and the chisel 25.

[0024] The chisel holder 24 is provided at the bottom of the cylinder portion 23 and is a portion that holds the chisel 25. The chisel holder 24 also transmits kinetic energy such as vibrations and impacts transmitted from the cylinder portion 23 to the chisel 25. The shape and structure of the chisel holder 24 are not limited, but it may be equipped with a conventionally known chuck mechanism in order to interchangeably hold multiple types of chisels 25.

[0025] The chisel 25 is a rod-shaped member attached to the chisel holder 24, and is the part whose tip comes into contact with the object of the chipping work. The chisel 25 transmits vibration and impact energy from the cylinder part 23 through the chisel holder 24 to the tip, thereby chipping the concrete or other object of the work that the tip comes into contact with. There are no limitations on the shape or material of the chisel 25, and conventionally known chrome molybdenum steel or the like can be used.

[0026] The mounting part 31 is a part for attaching the anti-scattering device 30 to the hand breaker 20. The shape and structure of the mounting part 31 are not limited, and it can be fastened using bolts or the like to screw holes or the like provided on the hand breaker 20, or attached to the hand breaker 20 using adhesive tape or the like. While FIGS. 2 and 3 show an example in which the mounting part 31 is attached to the cylinder part 23 of the hand breaker 20, the mounting position is not limited, and it may be the main body part 22 or the chisel holder 24. Additionally, although FIGS. 2 and 3 show an example in which the mounting parts 31 are attached to four positions on the hand breaker 20, the number of mounting parts is not limited as long as the anti-scattering device 30 can be properly attached to the hand breaker 20.

[0027] The arm portion 32 extends from the mounting portion 31 toward the outer periphery of the hand breaker 20 and holds the annular holder 33. There are no restrictions on the shape or material of the arm portion 32, but it is preferable to use a pipe made of metal or resin to hold the annular holder 33 in the height direction of the hand breaker 20. While FIGS. 2 and 3 show an example in which a rod-shaped pipe is used as the arm portion 32, a plate-shaped or lattice-shaped pipe may also be used. Additionally, while FIGS. 2 and 3 show an example in which the arm portion 32 extends horizontally from the mounting portion 31 so that the heights of the mounting portion 31 and the annular holder 33 are approximately the same, the arm portion 32 may be tilted at a predetermined angle.

[0028] The annular holding portion 33 is held by the arm portion 32 and is disposed so as to surround the outer periphery of the hand breaker 20. The annular holding portion 33 is provided with a plurality of anti-scattering pieces 34 arranged along the circumferential direction. The annular holding portion 33 is held by the arm portion 32 at a position a predetermined distance away from the mounting portion 31, so a gap is formed between the annular holding portion 33 and the hand breaker 20. As a result, an opening 35 surrounded by the mounting portion 31, the arm portion 32, and the annular holding portion 33 is formed inside the annular holding portion 33.

[0029] The shape and material of the annular holder 33 are not limited, but it must be rigid enough to hold multiple shatter prevention pieces 34, and it is preferable to use a pipe or the like made of metal or resin. The distance from the hand breaker 20 to the annular holder 33 is not limited, but it is preferable that it be at least 10 cm away from the attachment position to the hand breaker 20 to ensure sufficient area for the opening 35. While the annular holder 33 is shown in FIGS. 2 and 3 as being annular, the shape is not limited and it may be rectangular or polygonal. The annular holder 33 does not necessarily have to completely surround the outer periphery of the hand breaker 20; it may be semi-annular, with a portion of the ring interrupted.

[0030] The anti-scattering pieces 34 are provided in multiple locations on the annular holder 33 and extend downward. The number, shape, and material of the anti-scattering pieces 34 are not limited. However, they are preferably made of a flexible resin material so that the angle of inclination relative to the annular holder 33 and the road surface G can be adjusted. In the example shown in FIG. 2, the anti-scattering pieces 34 are rectangular with a fixed width. However, they may also be trapezoidal, with a width that widens downward. Also, in FIGS. 2 and 3, the lower ends of the anti-scattering pieces 34 extend outward from the annular holder 33, creating gaps between adjacent anti-scattering pieces 34. However, it is preferable to appropriately design the shape and density of the anti-scattering pieces 34 so that no gaps are created. Furthermore, as shown in FIG. 3(a), the vertical length of the anti-scattering pieces 34 is preferably greater than the length from the mounting portion 31 to the tip of the chisel 25.

[0031] The openings 35 are openings provided inside the annular holding portion 33 at the top of the anti-scattering device 30. In FIGS. 2 and 3, the arm portions 32 extend in a cross shape from the four mounting portions 31 to the annular holding portion 33, and the openings 35 are provided in four areas surrounded by the cylinder portion 23, the arm portions 32, and the annular holding portion 33. However, the shape and number of openings 35 are not limited. Providing the openings 35 at the top of the anti-scattering device 30 allows the worker 10 to visually confirm the tip of the chisel 25 contacting the road surface G through the openings 35. This allows the anti-scattering device 30 of this embodiment to reduce the number of personnel and processes required for chipping work, further improving work efficiency.

[0032] FIG. 4 is a schematic cross-sectional view showing the state of the anti-scattering device 30 when the hand breaker 20 is in use. As shown in FIG. 4, the worker 10 holds the hand breaker 20 and abuts the tip of the chisel 25 against the road surface G in the work area. At this time, the anti-scattering pieces 34 of the anti-scattering device 30 extend below the tip of the chisel 25, so the tip of the anti-scattering pieces 34 contacts the road surface G before the tip of the chisel 25. Therefore, each anti-scattering piece 34 spreads outward with the annular holding portion 33 as a fulcrum, and the lower end of the anti-scattering piece 34 is inclined relative to the road surface G. Furthermore, because the tips of the multiple anti-scattering pieces 34 contact and spread with the road surface G, the anti-scattering pieces 34 as a whole form a truncated cone shape that spreads downward, as shown in FIG. 2.

[0033] When performing chipping work, the worker 10 operates the throttle lever or the like on the handle portion 21 to vibrate the chisel 25 and break up the concrete or the like on the road surface G. At this time, pieces of the broken concrete or the like scatter in a direction away from the hand breaker 20. However, when the scattering prevention device 30 of this embodiment is attached to the hand breaker 20, the scattered pieces collide with the scattering prevention pieces 34 and fall, thereby effectively preventing the pieces from scattering outside the scattering prevention device 30.

[0034] As described above, the lower ends of the anti-scattering pieces 34 spread out during chipping work, and the anti-scattering pieces 34 are inclined relative to the road surface G. This causes fragments that collide with the anti-scattering pieces 34 to be reflected downward, reducing the likelihood of them flying upward through the opening 35. Furthermore, because the anti-scattering pieces 34 are positioned outward of the annular retaining portion 33, the anti-scattering pieces 34 tend to fall outward of the annular retaining portion 33. This reduces the number of fragments that fly in the area inside the annular retaining portion 33, making it easier for the worker 10 to see the tip of the chisel 25 through the opening 35. Furthermore, because the anti-scattering pieces 34 are formed in a plate shape rather than a net or mesh shape, fragments of a few millimeters in size do not slip through, and the scattering of even smaller dust particles is also suppressed.

[0035] As described above, in the anti-scattering device 30 of the present invention, the anti-scattering pieces 34 provided on the annular holding portion 33 suppress the scattering of fragments, but the mounting portion 31 and arm portion 32 hold the annular holding portion 33 in a position separated from the hand breaker 20, so that the working position on the road surface G can be clearly seen from inside the annular holding portion 33, reducing the number of personnel and processes required for chipping work and further improving work efficiency.

[0036] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to Fig. 5. Descriptions of content that overlap with the first embodiment will be omitted. Fig. 5 is a schematic diagram showing the structure of a scattering prevention device 30 according to this embodiment. This embodiment differs from the first embodiment in that the attachment portion 31 of the scattering prevention device 30 is attached to the chisel holder 24 of the hand breaker 20.

[0037] 5, the anti-scattering device 30 of this embodiment includes an attachment portion 31, an arm portion 32, an annular holding portion 33, an anti-scattering piece 34, and an opening 35. The attachment portion 31 is attached to the chisel holder 24. The arm portion 32 extends horizontally from the attachment portion 31 toward the outer periphery of the hand breaker 20 and holds the annular holding portion 33. Therefore, the annular holding portion 33 is held by the arm portion 32 at a position spaced a predetermined distance from the attachment portion 31, forming a gap between the annular holding portion 33 and the hand breaker 20, thereby forming an opening 35 (not shown). The anti-scattering piece 34 is held below the annular holding portion 33, and its tip extends downward beyond the tip of the chisel 25.

[0038] In this embodiment, the anti-scattering device 30 is attached to the chisel holder 24, which may cause the anti-scattering device 30 to vibrate in conjunction with the chisel holder 24 during chipping operations with the hand breaker 20. However, debris generated during chipping operations collide with the anti-scattering pieces 34 held by the annular holder 33 and fall, effectively preventing debris from scattering outside the anti-scattering device 30. Furthermore, in this embodiment, the arm 32 has a low rigidity and is designed to be easily elastically deformed. This allows the deflection of the arm 32 to attenuate the vibrations transmitted to the annular holder 33, even when the vibrations of the chisel holder 24 are transmitted to the mounting portion 31. In this case, by making the natural period of the arm 32 longer than the vibration period, movement of the annular holder 33 and the anti-scattering pieces 34 due to inertia can be suppressed.

[0039] As described above, in the anti-scattering device 30 of the present invention, the anti-scattering pieces 34 provided on the annular holding portion 33 suppress the scattering of fragments, but the mounting portion 31 and arm portion 32 hold the annular holding portion 33 in a position separated from the hand breaker 20, so that the working position on the road surface G can be clearly seen from inside the annular holding portion 33, reducing the number of personnel and processes required for chipping work and further improving work efficiency.

[0040] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to Fig. 6. Descriptions of content that overlap with the first embodiment will be omitted. Fig. 6 is a schematic diagram showing the structure of a shatter prevention device 30 according to this embodiment. This embodiment differs from the first embodiment in that shatter prevention pieces 34 are provided in multiple locations in the width direction of the annular holding portion 33.

[0041] As shown in FIG. 6, the anti-scattering device 30 of this embodiment includes an attachment portion 31, an arm portion 32, an annular holding portion 33, anti-scattering pieces 34, and an opening 35. The anti-scattering pieces 34 are provided in double layers, on the inside and outside of the width direction along the circumferential direction of the annular holding portion 33. The arm portion 32 extends horizontally from the attachment portion 31 toward the outer periphery of the hand breaker 20 to hold the annular holding portion 33. While FIG. 6 shows an example in which the anti-scattering pieces 34 are provided in double layers, any number of layers may be used as long as multiple pieces are provided overlapping each other. It is also preferable to arrange the anti-scattering pieces 34 on the inside and outside alternately in the circumferential direction so as to fill the gaps between adjacent anti-scattering pieces 34.

[0042] In the scattering prevention device 30 of this embodiment, the scattering prevention pieces 34 are provided in multiple layers along the circumferential direction of the annular holding portion 33, so that even if the tips of the scattering prevention pieces 34 come into contact with the road surface G and spread outward during chipping work, gaps are less likely to form between adjacent scattering prevention pieces 34. This makes it possible to more effectively prevent fragments generated during chipping work from slipping through the gaps between the scattering prevention pieces 34 and scattering to the outside.

[0043] As another modification of the shatter prevention pieces 34, multiple shatter prevention pieces 34 may be arranged in a circumferential direction so that some of them overlap. Alternatively, the shatter prevention pieces 34 may be branched into multiple pieces at the bottom. Alternatively, the shatter prevention pieces 34 may be configured in a wire shape, and multiple shatter prevention pieces 34 may be arranged in a brush-like shape in the circumferential and radial directions.

[0044] As described above, in the anti-scattering device 30 of the present invention, the anti-scattering pieces 34 provided on the annular holding portion 33 suppress the scattering of fragments, but the mounting portion 31 and arm portion 32 hold the annular holding portion 33 in a position separated from the hand breaker 20, so that the working position on the road surface G can be clearly seen from inside the annular holding portion 33, reducing the number of personnel and processes required for chipping work and further improving work efficiency.

[0045] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0046] 10...Worker 20...Hand Breaker 21...Handle 22...Main body 23...Cylinder section 24...Chisel holder 25...Chisel 30…Scatter prevention device 31...Attachment part 32...Arm section 33...Annular retaining portion 34…Scatter prevention piece 35...Opening

Claims

1. A scattering prevention device attached to a hand breaker, an annular holding portion disposed around the hand breaker; a plurality of anti-scattering pieces provided along the circumferential direction of the annular holding portion; A scattering prevention device comprising an attachment part that holds the annular holding part at a position spaced apart from the hand breaker.

2. The anti-scattering device according to claim 1, A scattering prevention device characterized in that the annular holding portion is spaced at least 10 cm from the position where the attachment portion is attached to the hand breaker.

3. The anti-scattering device according to claim 1, A scattering prevention device characterized in that the scattering prevention piece extends below the tip of the hand breaker.

4. The anti-scattering device according to claim 1, The shatter prevention device is characterized in that the shatter prevention piece is made of a flexible resin material.

5. The anti-scattering device according to claim 1, A scattering prevention device characterized in that a plurality of the scattering prevention pieces are arranged in an overlapping manner in the width direction of the annular holding portion.

6. The scattering prevention device according to any one of claims 1 to 5, The scattering prevention device is characterized in that an opening is provided between the annular holding portion and the mounting portion.

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