Concrete Brush

Abstract

To provide a concrete brush capable of preventing an excessive tilting toward a concrete surface side and preventing a fitting part from contacting the concrete surface even when a force in a pulling direction is transmitted to the fitting part via a handle in operating the concrete brush in the pulling direction and performing a finishing work with a trace of a rake.SOLUTION: A concrete brush comprises: a brush base 12 implanted with a brush 11; a holder 13; a socket 15 provided at the other side of the holder 13 via a fitting part 14; and a handle 16 of which a tip is fitted to the socket 15. The fitting part 14 comprises: a fixing plate 19 fixed to the holder 13; a laminated movable plate 20; a first angle adjustment part 21 allowing an angle adjustment of the movable plate 20 along the fixing plate 19; and a second angle adjustment part 23 pivoted to the support part 22 and allowing the angle adjustment of the socket 15 along a support surface 22e of the support part 22. The fixing plate 19 and the movable plate 20 protrude to a handle fitting side Xa to the holder 13.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a concrete brush used for finishing concrete surfaces with broom teeth. [Background technology]

[0002] Generally, concrete is poured onto floor surfaces such as dirt floors and parking lot slopes, and in order to make the surface non-slip, a broom or brush, such as that disclosed in Patent Document 1, is used to give the concrete surface a broom-like finish (also known as a brush-like finish or roughening) to form regular broom marks.

[0003] The broom disclosed in Patent Document 1 is configured so that the broom tip can be replaced with respect to the base. The handle that the user holds is attached to the base via a mountain-shaped protrusion, and the base is configured so that the angle of the base can be adjusted in the swing direction relative to the handle.

[0004] However, when performing broom finishing work on a concrete surface, not only is the broom pulled toward the long handle, but the long handle is also pushed toward the base. More specifically, the broom creates broom grooves by pulling the broom along a predetermined direction on the concrete surface, and when this is done to one end of the predetermined direction, the broom is pushed toward the other end of the predetermined direction to create broom grooves.

[0005] In this case, the angle of the base relative to the handle cannot be adjusted in the push / pull direction, which can cause the tip of the broom to bend and ruin the shape of the teeth created by the finishing process. This is particularly likely to happen if the tip of the broom is tilted relative to the concrete surface. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Publication No. 52-121162 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, the object of this invention is to provide a concrete brush that, when operating the concrete brush in the pushing direction to perform broom finishing work, can prevent excessive tilting toward the concrete surface even if a pushing force is transmitted to the attachment part via the handle, and can prevent the attachment part from hitting the concrete surface. [Means for solving the problem]

[0008] This invention is a concrete brush comprising a brush base with a brush attached to one side facing the concrete surface, a holder for holding the brush base, a socket provided on the other side of the holder via an attachment part, and a handle whose tip is attached to the socket and held by the user, wherein the attachment part comprises a fixed plate fixed to the holder, a movable plate stacked on the fixed plate, a first angle adjustment part that adjusts the angle of the movable plate along the fixed plate, and a second angle adjustment part that is pivotally supported on a support part provided on the other side of the first angle adjustment part and adjusts the angle of the socket along the support surface of the support part, and wherein the fixed plate and the movable plate protrude from the holder on the side where the handle is attached to the socket.

[0009] According to this invention, the fixed plate and movable plate of the mounting part protrude toward the side where the handle is attached, so that when the concrete brush is operated in the pushing direction to perform broom finishing work, even if a pushing force is transmitted to the mounting part via the handle, the fixed plate and movable plate of the mounting part do not tilt excessively toward the concrete surface, preventing the fixed plate and movable plate from hitting the concrete surface. As a result, the regular crease shape of the broom teeth can be prevented from being destroyed, and the brush finishing work can be carried out smoothly.

[0010] As an aspect of this invention, the first angle adjustment unit may include a rotation center axis that penetrates the fixed plate and the movable plate, an arc-shaped guide groove formed in the fixed plate and centered on the rotation center axis, a bolt that is provided on the movable plate and protrudes to one side of the fixed plate through the guide groove, and a nut that is screwed onto the bolt.

[0011] According to this invention, the movable plate can be adjusted to any angle by tightening the bolts and nuts depending on the work space and the characteristics of the user, thereby improving usability and workability.

[0012] In detail, the movable plate can rotate around the rotation center axis as a fulcrum, so the movable plate can be adjusted to any angle by loosening the nut, moving the bolt along the arc-shaped guide groove to any position, and then tightening the bolt and nut. The support part and socket fixed to the movable plate, and the handle attached to the socket, move together with the movable plate.

[0013] As another aspect of the present invention, the rotation center shaft may be disposed on the side of the holder where the handle is attached to the socket. According to this invention, the rotational axis is disposed on the side of the holder where the handle is attached to the socket, thereby improving the ease of positioning the rotational axis.

[0014] In another aspect of the present invention, the second angle adjustment portion may include a pin hole provided in the socket, a through hole provided in the support portion, and a pin inserted between the through hole and the pin hole. The pin may be a clip having a pin portion.

[0015] According to this invention, if the socket is fastened to the support part with a bolt and nut, loosening and tightening of the nut is required, but in this embodiment, the angle of the socket can be adjusted with one touch by inserting and removing the pin into the pin hole or through hole.

[0016] In another aspect of the present invention, the support portion is located on both outer sides of the socket, and a fan-shaped recess is formed on the outer surface of the socket with the pivot center as a fulcrum, and the upper part of the support portion abuts within the recess, and the recess sets the adjustment range by the second angle adjustment portion.

[0017] According to this invention, the angle adjustment range of the socket by the second angle adjustment portion is restricted by the fan-shaped recess, so that the socket and handle can be adjusted to an angle more suitable for brush finishing work.

[0018] In another aspect of the present invention, a brush base storage space is provided on one side of the holder to store the brush base in the longitudinal direction of the holder, and the brush base has engaging portions at both ends in the width direction perpendicular to the longitudinal direction of the brush base, and the brush base storage space in the holder has engaging portions to engage the engaging portions.

[0019] According to this invention, the locking portion of the holder locks into the engaging portion of the brush stand, ensuring that the holder holds the brush stand securely, and also allowing the brush stand with the brush to be easily replaced when the brushes deteriorate or when a different pattern of brush is adopted.

[0020] As another aspect of the present invention, the holder may be provided with a fixing member accommodating space for fixing a fixing member that fixes the fixing plate to the holder so as to be movable along the longitudinal direction of the holder. According to this invention, the mounting part including the fixed plate, the movable plate, and the first angle adjustment part can be mounted at any position in the longitudinal direction of the holder, thereby improving the usability and workability of the concrete brush. [Effects of the Invention]

[0021] According to this invention, when the concrete brush is operated in the pushing direction to perform broom finishing work, even if a pushing force is transmitted to the attachment part via the handle, it is possible to provide a concrete brush that prevents excessive tilting toward the concrete surface and prevents the attachment part from hitting the concrete surface. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is an overall perspective view of a concrete brush. [Figure 2] Front view of a concrete brush. [Figure 3] Rear view of a concrete brush. [Figure 4] Top view of concrete brush. [Figure 5] Bottom view of a concrete brush. [Figure 6] Left side view of the concrete brush. [Figure 7] Right side view of the concrete brush. [Figure 8] An enlarged cross-sectional view taken along line AA in Figure 1. [Figure 9] FIG. 2 is an enlarged plan view of the main part of the concrete brush. [Figure 10] Enlarged bottom view of the main part of the concrete brush. [Figure 11] Enlarged rear view of the main parts of the concrete brush. [Figure 12] 10 is a cross-sectional view taken along line BB in FIG. 9. [Figure 13] (a) is a plan view of the support part, (b) is a plan view of the movable plate, and (c) is a plan view of the fixed plate. [Figure 14] 14(a) is a perspective view of the socket, and (b) is a cross-sectional view taken along line CC in FIG. 14(a). [Figure 15] Cross-sectional view taken along line DD in Figure 1. DETAILED DESCRIPTION OF THE INVENTION

[0023] An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows an overall oblique view of the concrete brush 10, Figure 2 shows a front view of the concrete brush 10, Figure 3 shows a rear view of the concrete brush 10, Figure 4 shows a plan view of the concrete brush 10, Figure 5 shows a bottom view of the concrete brush 10, Figure 6 shows a left side view of the concrete brush 10, and Figure 7 shows a right side view of the concrete brush 10.

[0024] In addition, Figure 8 shows an enlarged cross-sectional view taken along the line AA in Figure 1, Figure 9 shows an enlarged plan view of the key parts of the concrete brush 10, Figure 10 shows an enlarged bottom view of the key parts of the concrete brush 10, and Figure 11 shows an enlarged rear view of the key parts of the concrete brush 10.

[0025] Furthermore, Fig. 12 shows a cross-sectional view taken along line BB in Fig. 9, Fig. 13(a) shows a plan view of support portion 22, Fig. 13(b) shows a plan view of movable plate 20, Fig. 13(c) shows a plan view of fixed plate 19, Fig. 14(a) shows a perspective view of socket 15, Fig. 14(b) shows a cross-sectional view taken along line CC in Fig. 14(a), and Fig. 15 shows a cross-sectional view taken along line DD in Fig. 1.

[0026] In the following embodiments, the longitudinal direction of the holder 13 is referred to as the width direction Z, and the direction intersecting the width direction W is referred to as the depth direction X. In the depth direction X, the side of the holder 13 where the handle 16 is attached to the socket 15 is referred to as the handle attachment side Xa, and the side of the holder 13 opposite the handle attachment side Xa where the handle 16 is not attached to the socket 15 is referred to as the anti-attachment side Xb.

[0027] Furthermore, one side facing the concrete surface Con is designated as the opposing side Ya, and the other side is designated as the opposite side Yb. Furthermore, the longitudinal direction of the handle 16 is designated as the longitudinal direction L, the side of the holder 13, which is one side of the handle 16, is designated as the base side La, and the other side of the handle 16, i.e., the tip side of the handle 16, is designated as the tip side Lb. For convenience of illustration, the brush 11 is omitted from Figures 9 to 12 and 15.

[0028] As shown in Figures 1 to 8, the concrete brush 10 of this embodiment comprises a brush base 12 with a brush 11 planted on the opposite side Ya facing the concrete surface Con, a holder 13 that holds the brush base 12, a socket 15 provided on the opposite side Yb of the holder 13 via an attachment portion 14, and a handle 16 whose tip is attached to the socket 15 and which is held by the user.

[0029] The brush base 12 and holder 13 described above extend a predetermined length in the width direction W, as shown in FIG. 1, and the brush base 12 is made of synthetic resin, while the holder 13 is made of an extruded light alloy.

[0030] 1 and 8, the brush 11 has bristle bundles made up of a plurality of brush bristles planted in two rows in the depth direction X perpendicular to the width direction W at the end of the opposite side Ya of the brush base 12, with 115 bundles planted at equal intervals in the width direction W. Here, the bristle bundles in one row are planted so as to be positioned between the bristle bundles in the other row.

[0031] As shown in Figure 12, the above-mentioned brush base 12 has two grooves 12b formed on the end face of the opposite side Yb of the brush base main body 12a, which has a rectangular cross section, that are recessed toward the opposite side Ya, and protruding portions 12c that protrude outward as engaging portions are integrally formed at both ends of the brush base main body 12a in the depth direction X, which is perpendicular to the width direction W.

[0032] As shown in FIG. 12, the holder 13 includes a pair of fixing plate mounting portions 13a located at the ends on the opposite side Yb, a pair of vertical walls 13b extending from the middle of the fixing plate mounting portions 13a in the depth direction X to the opposite side Ya, a pair of connecting portions 13c with a generally triangular cross section extending from the ends on the opposite side Ya of the pair of vertical walls 13b toward the opposite side Ya and outward, and a pair of skirt portions 13d extending from the outer ends on the opposite side Ya of the pair of connecting portions 13c to the opposite side Ya.

[0033] Further, a lateral wall 13e is provided which connects the inner ends of the opposing sides Ya of the pair of connecting portions 13c in the depth direction X. A brush base storage space 17 for storing the brush base 12 is provided on the opposite side Ya of the holder 13 in the width direction W of the holder 13. The brush base storage space 17 is surrounded by a side wall 13e and a pair of skirt portions 13d, and the opposite side Ya is open.

[0034] In the brush base storage space 17 in the holder 13 described above, more specifically, at the ends of the opposing sides Ya of the pair of skirt portions 13d, a pair of locking portions 13f that lock onto the protrusion portion 12c of the brush base 12 are integrally formed facing inward.

[0035] As a result, the engaging portion 13f of the holder 13 engages with the protruding portion 12c of the brush base 12, ensuring that the brush base 12 is held securely by the holder 13, and also enabling the brush base 12 with the brush 11 to be easily replaced when the brush 11 deteriorates or when a different pattern of brush is used.

[0036] As shown in Figures 8 and 12, the holder 13 described above is provided with a fixing member storage space 18 in which bolts 24 and square nuts 25, which function as fixing members for fixing a fixing plate 19 (described later) to the holder 13, are fixed so as to be movable along the width direction W of the holder 13.

[0037] The fixing member storage space 18 is surrounded by a pair of fixing plate mounting portions 13a, a pair of vertical walls 13b, and a horizontal wall 13e, and is open on the opposite side Yb. This allows the above-mentioned mounting portion 14 to be attached at any position in the width direction W of the holder 13, improving the usability and workability of the concrete brush 10.

[0038] As shown in Figures 8 to 11, the above-mentioned mounting portion 14 includes a fixed plate 19 placed and fixed on the fixed plate mounting portion 13a of the holder 13, a movable plate 20 stacked on the fixed plate 19, and a first angle adjustment portion 21 by which the angle of the movable plate 20 is adjusted along the fixed plate 19.

[0039] In addition, the above-mentioned mounting portion 14 is pivotally supported on a support portion 22 provided on the opposite side Yb of the first angle adjustment portion 21, and is provided with a second angle adjustment portion 23 that adjusts the angle of the socket 15 along the support surface 22e of the support portion 22 (see Figure 13(a)).

[0040] As shown in Figure 13(c), the above-mentioned fixing plate 19 is integrally formed with a square-shaped portion 19a extending in the width direction W along the fixing plate mounting portion 13a of the holder 13 and a semicircular-shaped portion 19b located on the handle mounting side Xa relative to the square-shaped portion 19a.

[0041] 13(c), bolt insertion holes 19c are formed in both ends of the rectangular portion 19a of the fixing plate 19 in the width direction W, and a hole 19d through which a bolt 27 serving as a rotation center shaft (described later) is inserted and an arc-shaped guide groove 19e centered on the hole 19d are formed in the semicircular portion 19b. The fixing plate 19 is a metal fixing plate that is flat on both sides.

[0042] As shown in FIGS. 8 to 11, the fixing plate 19 is fixed to the holder 13 using a bolt 24 and a square nut (so-called square nut) 25 as fixing members. More specifically, as shown in FIG. 8, a bolt 24 is inserted through the bolt insertion hole 19c of the fixing plate 19 into a square nut 25 arranged in the fixing member storage space 18 of the holder 13, and the bolt 24 is tightened to the square nut 25, thereby fixing the fixing plate 19 to the fixing plate mounting portion 13a of the holder 13.

[0043] Here, as shown in Figure 12, a pair of protrusions 13g are integrally formed on the vertical wall 13b of the holder 13, protruding from the vertical wall 13b into the fixing member storage space 18 and extending in the width direction W, and these pair of protrusions 13g restrict the movement of the square nut 25 to the opposite side Ya.

[0044] The movable plate 20 laminated on the fixed plate 19 is formed as shown in Fig. 13(b). That is, the movable plate 20 has a movable plate main body 20a, and a hole 20b through which a bolt 27 serving as a rotation center shaft, which will be described later, is inserted is formed approximately in the center of this movable plate main body 20a, and a bolt insertion hole 20c through which a bolt 26 is inserted is formed at a position facing a part of the arc-shaped guide groove 19e of the fixed plate 19. The movable plate main body 20a is formed from flat metal plates on both the front and back sides.

[0045] The support part 22 provided on the opposite side Yb of the first angle adjustment part 21 is formed as shown in Fig. 13(a). That is, the support part 22 includes a mounting seat 22a and a pair of support pieces 22b erected on the opposite side Yb from both ends of the anti-mounting side Xb of the mounting seat 22a. The ends on the opposite side Yb of the pair of support pieces 22b are formed in a semicircular shape.

[0046] As shown in Figure 13(a), a hole portion 22c is formed through the mounting seat 22a of the support portion 22, through which a bolt 27, which will be the rotation center axis described later, is inserted, and on the opposite side Yb of the pair of support pieces 22b of the support portion 22, as shown in Figure 8, a bolt hole portion 22d is formed so that a bolt 31, which will be the pivot axis described later, is inserted.

[0047] The support part 22 is a metal part, and the mounting seat 22a of the support part 22 is joined and fixed by a joining means such as welding on the opposite side Yb of the movable plate 20, on the anti-mounting side Xb of the movable plate 20, as shown in FIG. 8, and also at the center of the movable plate 20 in the width direction W, as shown in FIG.

[0048] When the movable plate 20 to which the support portion 22 is joined and fixed is stacked on the fixed plate 19 as shown in Figure 8, the hole portion 22c of the support portion 22, the hole portion 20b of the movable plate 20, and the hole portion 19d of the fixed plate 19 are aligned, so that a bolt 27 as a rotation center axis is inserted through each of these holes 19d, 20b, and 22c from the opposing side Ya toward the opposite side Yb, and a nut 28 is screwed onto the bolt shaft portion of the bolt 27 protruding to the opposite side Yb.

[0049] As a result, the movable plate 20 and the support portion 22 are integrated with the fixed plate 19, which is disposed so as to be movable relative to the holder 13 along the width direction W of the holder 13. As shown in FIGS. 8 to 10, the fixed plate 19 and the movable plate 20 protrude from the holder 13 toward the side where the handle 16 is attached to the socket 15, that is, toward the handle attachment side Xa.

[0050] In this way, the fixed plate 19 and movable plate 20 of the mounting portion 14 protrude toward the handle mounting side Xa, which is the side of the holder 13 where the handle 16 is attached to the socket 15.Therefore, when the concrete brush 10 is operated in the pushing direction to perform broom finishing work, even if a pushing force is transmitted to the mounting portion 14 via the handle 16, the protruding end portion 29 of the fixed plate 19 and movable plate 20 of the mounting portion 14 will not tilt excessively toward the concrete surface Con.

[0051] As a result, the fixed plate 19 and the movable plate 20 are prevented from hitting the concrete surface Con, and the regular broom-teeth shape resulting from the broom-teeth finishing is prevented from being distorted, allowing for smooth brush finishing work.

[0052] The above-mentioned first angle adjustment part 21 includes a bolt 27 (more specifically, the bolt shaft part of the bolt 27) as a rotation center axis that penetrates through the fixed plate 19, the movable plate 20, and the mounting seat 22a of the support part 22, an arc-shaped guide groove 19e formed in the fixed plate 19 and centered on the bolt 27, a bolt 26 provided in the movable plate 20 that protrudes to the opposite side Ya of the fixed plate 19 through the guide groove 19e, and a knob nut 30 that is screwed onto the bolt 26.

[0053] The bolt 26 passes through the bolt insertion hole 20c of the movable plate 20 shown in FIG. 13(b) and the arc-shaped guide groove 19e of the fixed plate 19 shown in FIG. 13(c), and the knob nut 30 is screwed onto the end of the bolt 26.

[0054] The knob nut 30 has a portion that fastens to the through end of the bolt 26 and an operating portion with an enlarged diameter, and is configured so that it can be turned by hand to tighten. Here, it is preferable that the head of the bolt 26 is joined and fixed to the movable plate 20 by means of welding or the like.

[0055] This allows the movable plate 20 to be adjusted to any angle indicated by arrows a and b in Figure 9 by tightening the bolts 26 and knob nuts 30 described above, depending on the work space for brush finishing work and the characteristics of the user (for example, whether the user is right-handed or left-handed), thereby improving usability and workability.

[0056] In detail, the movable plate 20 is configured to be rotatable around the bolt 27 as the central axis of rotation as a fulcrum, and the movable plate 20 can be adjusted to any angle by loosening the knob nut 30 and moving the bolt 26 to any position along the arc-shaped guide groove 19e, and then tightening the bolt 26 and knob nut 30.

[0057] The support part 22 and socket 15 fixed to the movable plate 20, and the handle 16 attached to the socket 15 move together with the movable plate 20, so the orientation of the handle 16 relative to the width direction W of the brush 11, brush base 12, and holder 13 can be adjusted as desired using the first angle adjustment part 21.

[0058] 8, the bolt 27 serving as the rotation center shaft is disposed on the handle attachment side Xa relative to the holder 13. This prevents interference between the bolt 27 and the holder 13 and improves the ease of placement of the bolt 27.

[0059] As shown in Figures 8 and 14, the above-mentioned socket 15 has a square pillar member 15a that is aligned with the longitudinal direction L of the handle 16, and a through hole 15b that extends in the same direction, and a screw hole 15c that allows the tip of the handle 16 to be detachably attached is formed on the base end side La of the through hole 15b.

[0060] A pivot hole 15d, which serves as a pivot center, is formed parallel to the width direction W of the holder 13 and penetrates the square column member 15a of the socket 15 at a position close to the screw hole 15c in the middle in the longitudinal direction L. Furthermore, on both outer side surfaces 15e of the square column member 15a of the socket 15, there are formed sector-shaped recesses 15f with the fulcrum being the axis of the pivot hole 15d, which is the pivot center.

[0061] The support surfaces 22e of the pair of support pieces 22b of the support portion 22 shown in Figure 13(a) are abutted against the recesses 15f formed on both outer surfaces 15e of the socket 15 shown in Figure 14(a), and as shown in Figure 11, a nut 32 is screwed onto a bolt 31 serving as a pivot axis inserted through the bolt hole portions 22d of the support pieces 22b and the pivot hole 15d of the socket 15.

[0062] This connects the support part 22 and the socket 15 with the bolt 31 and nut 32, and forms a second angle adjustment part 23 that adjusts the angle of the socket 15 along the support surface 22e of the support part 22, using the bolt shaft part of the bolt 31 as a fulcrum.

[0063] In this way, the support portion 22 is located on the outer surface 15e of the socket 15, and a fan-shaped recess 15f is formed on the outer surface 15e of the socket 15, with the axis of the pivot hole 15d, which is the pivot center, as the fulcrum.The support surface 22e at the upper part of the support portion 22 abuts within the recess 15f, and the adjustment range by the second angle adjustment portion 23 is set by the recess 15f (see Figures 8 and 14).

[0064] More specifically, as shown in FIG. 14(a), the sector-shaped recess 15f includes a first restricting portion 15fa located on the distal end side Lb and a second restricting portion 15fb located on the proximal end side La. When the first restricting portion 15fa of the recess 15f abuts against the end face of the non-mounting side Xb of the support piece 22b of the support portion 22, the handle 16 is in the upright state α shown by the solid line in Figure 8, and when the second restricting portion 15fb of the recess 15f abuts against the end face of the handle mounting side Xa of the support piece 22b of the support portion 22, the handle 16 is in the tilted state β shown by the virtual line in Figure 8.

[0065] In this way, the angle adjustment range of the socket 15 and the handle 16 by the second angle adjustment portion 23 is restricted by the fan-shaped recess 15f, so the socket 15 and the handle 16 can be adjusted to an angle more suitable for brush finishing work. In this embodiment, the angle formed by the first restriction portion 15fa and the second restriction portion 15fb in the fan-shaped recess 15f is set to approximately 35 degrees, but this angle is not limited to this.

[0066] As shown in Figures 8 and 14, the second angle adjustment portion 23 described above has a pin hole 15g provided on the tip side Lb and opposite side Ya relative to the position of the pivot hole 15d in the socket 15, a through hole 22f provided in the support piece 22b in the support portion 22, and a clip 33 as a pin inserted between the through hole 22f and the pin hole 15g. The pin hole 15g is formed so as to penetrate the socket 15 and extend parallel to the width direction W of the holder 13 between the pair of sector-shaped recesses 15f.

[0067] As shown in FIGS. 9 to 11, the clip 33 serving as the pin described above includes a linear pin portion 33a, a bent portion 33b, and a grip portion 33c connecting the pin portion 33a and the bent portion 33b.

[0068] Then, as shown in Figure 8, by aligning the through hole 22f in the support piece 22b of the support portion 22 with the pin hole 15g of the socket 15 and then inserting the pin portion 33a of the clip 33 between the through hole 22f and the pin hole 15g in this state, the angle of the socket 15 can be fixed at a predetermined angle at which the handle 16 is in the upright position α.

[0069] If the angle of the socket 15 were to be adjusted by fastening the socket 15 to the support portion 22 with a bolt and nut, the nut would need to be loosened and tightened, and there would be a concern that the nut would loosen during the brush finishing work on the concrete surface Con. However, in this embodiment, the angle of the socket 15 can be adjusted with a single touch by inserting and removing the clip 33 into the through hole 22f and the pin hole 15g, and the angle of the socket 15 fixed by the clip 33 can be reliably maintained.

[0070] FIG. 15 shows a cross-sectional view of the end of the brush base 12 and the holder 13 taken along the arrow DD in FIG. As shown in FIG. 15, a bolt 34 and a square nut 35 are used to prevent the brush base 12 from undesirably moving or coming off.

[0071] More specifically, a bolt 34 is inserted between the fixing plate mounting portions 13a of the holder 13 and threaded into a square nut 35 disposed in the fixing member storage space 18 at the end of the holder 13 in the width direction W. The bolt 34 is then screwed into the square nut 35, and the tip of the bolt shank 34a presses the brush base 12 through an opening 36 formed in the side wall 13e of the holder 13. This presses the protruding portion 12c of the brush base 12 against the locking portion 13f of the holder 13, preventing the brush base 12 from coming off.

[0072] This configuration prevents the brush 11 and brush base 12 from moving in the width direction W relative to the holder 13 during broom finishing work on the concrete surface Con, and also prevents the brush 11 and brush base 12 from coming off the holder 13.

[0073] As described above, the concrete brush 10 of this embodiment comprises a brush base 12 on which a brush 11 is implanted on the opposite side Ya facing the concrete surface Con, a holder 13 that holds the brush base 12, a socket 15 provided on the opposite side Yb of the holder 13 via an attachment portion 14, and a handle 16 whose tip is attached to the socket 15 and held by the user.The attachment portion 14 comprises a fixed plate 19 fixed to the holder 13, a movable plate 20 stacked on the fixed plate 19, a first angle adjustment portion 21 by which the angle of the movable plate 20 is adjusted along the fixed plate 19, and a second angle adjustment portion 23 that is pivotally supported on a support portion 22 provided on the opposite side Yb of the first angle adjustment portion 21 and adjusts the angle of the socket 15 along the support surface 22e of the support portion 22.The fixed plate 19 and the movable plate 20 protrude toward the handle attachment side Xa, which is the side on which the handle 16 is attached to the socket 15 relative to the holder 13.

[0074] Therefore, when the concrete brush 10 is operated in the pushing direction to perform broom finishing work, even if a pushing force is transmitted to the mounting part 14 via the handle 16, the holder 13 does not tilt excessively toward the concrete surface Con, and the fixed plate 19 and movable plate 20 can be prevented from hitting the concrete surface Con. As a result, the regular crease shape of the broom teeth can be prevented from being destroyed, and the brush finishing work can be carried out smoothly.

[0075] Furthermore, first angle adjustment unit 21 includes bolt 27, which serves as a rotation center axis and penetrates fixed plate 19 and movable plate 20, arc-shaped guide groove 19e formed in fixed plate 19 with bolt 27 as its center, bolt 26 provided in movable plate 20 and protruding through guide groove 19e to the opposite side Ya of fixed plate 19, and knob nut 30 threaded onto bolt 26. Therefore, movable plate 20 can be adjusted to any angle by fastening bolt 26 and knob nut 30 according to the work space and the characteristics of the user. This improves usability and operability.

[0076] More specifically, since the movable plate 20 is rotatable around the bolt 27 as a fulcrum, the movable plate 20 can be adjusted to any angle by loosening the knob nut 30, moving the bolt 26 to any position along the arc-shaped guide groove 19e, and then fastening the bolt 26 and the knob nut 30. The support part 22 and socket 15 fixed to the movable plate 20, and the handle 16 attached to the socket 15, move together with the movable plate 20.

[0077] Furthermore, in such a concrete brush 10, the bolt 27, which serves as the central axis of rotation, is positioned on the handle attachment side Xa relative to the holder 13, and by positioning the bolt 27 on the handle attachment side Xa relative to the holder 13, the positioning of the bolt 27 can be improved.

[0078] Furthermore, the second angle adjustment section 23 has a pin hole 15g provided in the socket 15, a through hole 22f provided in the support section 22, and a pin (see clip 33) inserted between the through hole 22f and the pin hole 15g. Therefore, if the socket 15 were fastened to the support section 22 with a bolt and nut, loosening and tightening of the nut would be necessary. However, in this embodiment, the angle of the socket 15 can be adjusted with a single touch by inserting and removing the pin (clip 33) into the pin hole 15g and through hole 22f.

[0079] Furthermore, the support portion 22 is located on both outer surfaces 15e of the socket 15, and a fan-shaped recess 15f is formed on the outer surface 15e of the socket 15 with the pivot center as the fulcrum, and the upper part of the support portion 22 abuts within the recess 15f, and the adjustment range by the second angle adjustment portion 23 is set by the recess 15f.Therefore, the angle adjustment range of the socket 15 by the second angle adjustment portion 23 is restricted by the fan-shaped recess 15f, and the socket 15 and handle 16 can be adjusted to an angle more suitable for brush finishing work.

[0080] In addition, a brush base storage space 17 is provided on the opposite side Ya of the holder 13 to store the brush base 12 in the width direction W of the holder 13, and the brush base 12 has protrusions 12c, which are engaged parts, at both ends in the depth direction X, which is perpendicular to the width direction W of the brush base 12, and the brush base storage space 17 in the holder 13 is provided with locking parts 13f that lock onto the protrusions 12c.Since the locking parts 13f of the holder 13 lock onto the protrusions 12c of the brush base 12, the brush base 12 is reliably held by the holder 13, and the brush base 12 with the brushes 11 can be easily replaced when the brushes 11 deteriorate or when a different pattern of brush is used.

[0081] Furthermore, the holder 13 is provided with a fixing member storage space 18 that movably fixes the bolts 24 and square nuts 25 that function as fixing members for fixing the fixed plate 19 to the holder 13 along the width direction W of the holder 13, so that the mounting portion 14, which includes the fixed plate 19, the movable plate 20, and the first angle adjustment portion 21, can be attached to any position in the width direction W of the holder 13. This improves the usability and workability of the concrete brush 10.

[0082] In correspondence between the configuration of this invention and the above-mentioned embodiment, The concrete brush of the present invention corresponds to the concrete brush 10 of the embodiment, Similarly, The brush corresponds to brush 11, The brush stand is compatible with brush stand 12, The engaged portion corresponds to the protruding portion 12c, The holder corresponds to the holder 13, The locking portion corresponds to the locking portion 13f, The mounting portion corresponds to the mounting portion 14, The socket is compatible with socket 15. The outer surface corresponds to the outer surface 15e; The fan-shaped recess corresponds to recess 15f, The pin hole corresponds to the pin hole 15g, The handle corresponds to handle 16. The brush stand storage space corresponds to the brush stand storage space 17, The fixing member storage space corresponds to the fixing member storage space 18, The fixing plate corresponds to fixing plate 19, The arc-shaped guide groove corresponds to the guide groove 19e, The movable plate corresponds to the movable plate 20, The first angle adjustment unit corresponds to the first angle adjustment unit 21, The support corresponds to the support 22, The support surface corresponds to the support surface 22e, The through hole corresponds to the through hole 22f, The second angle adjustment unit corresponds to the second angle adjustment unit 23, The fixing member corresponds to a bolt 24 and a square nut 25. The bolt protruding from one side of the fixing plate corresponds to bolt 26; The nut threaded onto the bolt corresponds to the knob nut 30. The rotation axis corresponds to bolt 27, The pin corresponds to clip 33, The concrete surface corresponds to the concrete surface Con, but the present invention is not limited to the configuration of the above-described embodiment, and many other embodiments can be obtained.

[0083] For example, a general hexagonal nut may be used instead of the above-described square nuts 25 and 35. Also, a plurality of pin holes 15g may be provided so as to position the socket 15 at an angle intermediate between the upright state α and the tilted state β shown in FIG. Furthermore, the knob nut 30 that is screwed onto the bolt 26 may be a hexagonal nut or a wing nut.

[0084] Furthermore, in the embodiment, as shown in Figure 12, a protrusion 12c is formed on the brush base 12 and an engaging portion 13f is formed on the holder 13, but instead of this, a structure may be adopted in which an engaging recess is formed on the brush base 12 as the engaged portion, and an engaging protrusion is formed on the holder 13 as the engaging portion that engages the engaging recess. [Explanation of symbols]

[0085] 10...Concrete brush 11...Brush 12...Brush stand 12c…Protrusion 13...Holder 13f…Locking part 14...Mounting part 15...Socket 15e…Outer surface 15f...recess 15g...Pinhole 16...Pattern 17...Brush stand storage space 18...Fixed parts storage space 19...Fixing plate 19e...Guide groove 20…Movable plate 21...First angle adjustment section 22...Support part 22e…support surface 22f…Through hole 23...Second angle adjustment section 24, 26, 27...Volts 25...Square nut 30...Knob nut 33...Clip Con…Concrete surface

Claims

1. a brush stand having brushes planted on one side facing the concrete surface; a holder for holding the brush base; a socket provided on the other side of the holder via an attachment portion; a handle whose tip is attached to the socket and which is held by a user; The mounting portion includes a fixed plate fixed to the holder, a movable plate stacked on the fixed plate, and a first angle adjustment unit that adjusts the angle of the movable plate along the fixed plate; a second angle adjustment unit pivotally supported on a support unit provided on the other side of the first angle adjustment unit and configured to adjust the angle of the socket along a support surface of the support unit, The fixed plate and the movable plate protrude from the holder toward the side where the handle is attached to the socket. Concrete brush.

2. The first angle adjustment unit is a rotation center shaft that penetrates the fixed plate and the movable plate; a guide groove formed in the fixed plate and having an arc shape centered on the rotation central axis; a bolt provided on the movable plate and protruding toward one side of the fixed plate through the guide groove; and a nut threaded onto the bolt.

2. The concrete brush of claim 1.

3. The rotation center shaft is disposed on the side of the holder where the handle is attached to the socket.

3. The concrete brush of claim 2.

4. The second angle adjustment portion includes a pin hole provided in the socket, a through hole provided in the support portion; a pin inserted between the through hole and the pin hole.

2. The concrete brush of claim 1.

5. The support portions are located on both outer sides of the socket, A fan-shaped recess is formed on the outer surface of the socket, with the pivot center as a fulcrum. The upper part of the support part is in contact with the recess, and the adjustment range of the second angle adjustment part is set by the recess.

5. The concrete brush of claim 4.

6. A brush base storage space for storing the brush base is provided on one side of the holder in the longitudinal direction of the holder, and the brush base is provided with engaged portions at both ends in the width direction of the brush base perpendicular to the longitudinal direction of the brush base, The brush base storage space in the holder is provided with a locking portion for locking the engaged portion.

2. The concrete brush of claim 1.

7. The holder is provided with a fixing member accommodating space for fixing a fixing member that fixes the fixing plate to the holder so as to be movable along the longitudinal direction of the holder.

2. The concrete brush of claim 1.

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