JP7162926B1 - DIAMETER EXPANSION ATTACHMENT, MODIFICATION METHOD OF FLOOR REVERSING DEVICE, AND REMODIFIED FLOOR REVERSING DEVICE - Google Patents

Abstract

[Problems] A diameter expansion attachment that can be used to change the rotation radius of a rotary trowel of a floor leveling device according to the size of the floor area and the difference in the shape of the floor surface at the construction site, and a floor using the diameter expansion attachment A method for remodeling a surface leveling device and a modified floor leveling device equipped with a diameter expansion attachment are provided. SOLUTION: A modified floor surface leveling device 100 includes a plurality of power-type rotating trowels 1 that rotate like a propeller while contacting a floor surface to be worked (for example, a concrete floor surface after casting), and a rotating trowel 1. , and a diameter expansion attachment 30 is detachably attached to surround the outermost protection ring 3. The diameter expansion attachment 30 includes a frame 36 that can be arranged in a state surrounding the protection ring 3 located on the outer periphery, and a plurality of connecting members 35 that hold the diameter expansion frame 36 in a state surrounding the protection ring 3. , is equipped with [Selection drawing] Fig. 1

Description

INDUSTRIAL APPLICABILITY The present invention relates to a floor leveling apparatus used for leveling and finishing of concrete floors and mortar floors after casting at building construction sites and construction sites of various concrete structures. The present invention relates to a modification method, a diameter expansion attachment used for modification, and a modified floor leveling apparatus provided with the diameter expansion attachment.

When constructing the floor surface of a building using concrete or mortar, after leveling the ready-mixed concrete cast at the construction site and leveling the floor, leave it for several hours and then use "Trowell". The concrete floor is evenly pressurized and flattened using a floor-leveling device called ”.

The floor leveling device (trowel) used in the above work typically has a power-driven rotary trowel that rotates like a propeller while in contact with the concrete floor (see, for example, Patent Document 1). . By using such a floor surface leveling device, it is possible to increase the efficiency of the work of flattening the concrete floor surface by pressure.

The performance of the above-mentioned floor leveling device (trowel) depends on the radius of the rotating surface of the rotary iron (hereinafter sometimes abbreviated as "rotation radius"), so if the floor area of the construction site is large, the rotation A leveling device with a large radius is used, and a leveling device with a small turning radius is used when the floor area is small.

Japanese Patent Application Laid-Open No. 2007-100426

As mentioned above, the floor leveling device is used properly according to the size of the floor area of the construction site. In some cases, it may not be possible to cope with only a small floor leveling device. Such a case can be dealt with by using a plurality of floor leveling devices with different rotation radii of the rotary trowel. In addition, it takes labor and time to load and unload the floor leveling device from the transport vehicle.

For this reason, floor leveling equipment with a small turning radius is used at construction sites with a large floor area, and floor leveling equipment with a large turning radius is used at construction sites with a small floor area. In the former case, a lot of time is required for the leveling work, and in the latter case, the leveling work on every corner of the floor surface is hindered.

Therefore, the problem to be solved by the present invention is to provide an expander that can be used when changing the rotation radius of a rotary trowel of a floor leveling device according to the size of the floor area of the construction site, the difference in the shape of the floor surface, etc. An object of the present invention is to provide a diameter attachment, a floor leveling apparatus remodeling method using the diameter expansion attachment, and a modified floor leveling apparatus equipped with the diameter expansion attachment.

The diameter expansion attachment according to the present invention includes a power-type rotary iron that rotates like a propeller while contacting the floor surface to be worked, and a protective ring arranged to cover the rotation area of the rotary iron. A diameter-expanding attachment detachably attached to a leveling device, comprising: a frame that can be arranged in a state surrounding the protective ring located on the outermost periphery; and a state in which the frame surrounds the protective ring. and fixing means for holding.

It should be noted that the frame of the diameter-expanding attachment may be arranged so as to surround the protection ring located on the outermost periphery, and the shape in plan view is not limited, so that the protection ring located on the outermost periphery For example, it can be circular, elliptical, elliptical, polygonal, or closed-curve, depending on the shape and conditions of the construction site.

In the diameter-expanding attachment, the fixing means may be a connecting member that is detachably interposed between the protective ring and the frame.

Here, the connecting member includes: an engaging portion that removably engages with at least the outermost protective ring; a holding portion that is integrated with the engaging portion and removably holds the frame; can be used.

Further, in the diameter expansion attachment, the fixing means may be a connecting member fixed to the frame and detachable from the protective ring or a connecting member fixed to the protective ring and detachable from the frame.

In the diameter expanding attachment, the frame may be formed of a plurality of segment members that can be connected and separated from each other.

In the diameter expanding attachment, the frame may have a similar shape to the outermost protection ring.

Next, the floor leveling device remodeling method according to the present invention includes a power-type rotary trowel that rotates like a propeller while contacting the floor surface to be worked, and a protection arranged so as to cover the rotation area of the rotary trowel. A floor leveling device comprising a ring and any one of the diameter expanding attachments described above is attached.

Next, the modified floor leveling apparatus according to the present invention includes a power-type rotary trowel that rotates like a propeller while contacting the floor surface to be worked, and a protective ring that is arranged so as to cover the rotation area of the rotary trowel. and any of the diameter expansion attachments described above.

According to the present invention, a diameter expansion attachment that can be used to change the rotation radius of a rotating trowel of a floor leveling device according to the size of the floor area and the difference in the shape of the floor surface at the construction site, and the diameter expansion attachment. It is possible to provide a floor leveling device remodeling method and a remodeled floor leveling device equipped with the diameter-expanding attachment.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partially-omission perspective view of the modified floor leveling apparatus which is embodiment of this invention. FIG. 2 is an enlarged view with partial omission of the modified floor leveling device shown in FIG. 1; FIG. 3 is a partially omitted plan view of the diameter expanding attachment shown in FIG. 2 ; FIG. 4 is a partially omitted bottom view of a region indicated by an arrow A in FIG. 3; FIG. 2 is a partially omitted plan view of a frame that constitutes the diameter expanding attachment shown in FIG. 1; 6 is an exploded view with partial omission of the frame shown in FIG. 5; FIG. It is a partially-omission plan view which shows the diameter-expansion attachment which is other embodiment. It is a partially-omission plan view which shows the diameter-expansion attachment which is other embodiment. It is a partially omitted plan view of a remodeled floor leveling device according to another embodiment. FIG. 10 is a partially omitted side view of the modified floor leveling device shown in FIG. 9; FIG. 10 is a partially omitted plan view of a frame that constitutes the diameter expanding attachment shown in FIG. 9; FIG. 12 is an exploded view with partial omission of the frame shown in FIG. 11; FIG. 10 is a partially omitted cross-sectional view showing another embodiment of the connecting member; FIG. 10 is a partially omitted cross-sectional view showing another embodiment of the connecting member; FIG. 10 is a partially omitted cross-sectional view showing another embodiment of the connecting member;

1 to 15, modified floor leveling apparatuses 100 and 200, diameter expanding attachments 30 and 50, and floor leveling apparatus remodeling methods, etc., according to embodiments of the present invention will be described below.

First, based on FIGS. 1 to 5, the modified floor leveling device 100 and the diameter expanding attachment 30 will be described. As shown in FIG. 1, the floor leveling device 99 before modification is also called a trowel, and is driven by the prime mover 5 while being in contact with the floor to be constructed (for example, the concrete floor after placing). It comprises a plurality of rotary irons 1 that rotate freely and protective rings 2 and 3 arranged to cover the rotating area of the rotary irons 1 for ensuring safety.

A prime mover 5 is mounted on a mounting base 4, and an output shaft (not shown) of the prime mover 5 is connected via a speed reducer 6 to a rotation transmission body 7 consisting of a plurality of radial arms. A rotating iron 1 is attached to the distal end side of each of the plurality of rotation transmitting bodies 7 via a paperweight-shaped fixing member 8 and a screw 9, respectively. By loosening the screw 9 , the rotating iron 1 can be attached to and detached from the rotation transmitting body 7 together with the fixing member 8 . A plurality of support legs 10 extend obliquely downward from the mounting base 4 , and protection rings 2 and 3 are attached to the lower ends of the support legs 10 .

A modified floor leveling device 100 is formed by mounting the diameter expansion attachment 30 on the floor leveling device 99 before modification. The diameter expansion attachment 30 has a frame 36 and a plurality of connecting members 35 . The frame 36 has a circular shape with a diameter larger than that of the protective ring 3 on the outermost periphery. A plurality of connecting members 35 are fixing means for the frame 36 . The frame 36 is arranged so as to concentrically surround the outermost protective ring 3 , and is detachably fixed to the protective ring 3 via a plurality of connecting members 35 .

As shown in FIGS. 2 and 3, the connecting member 35 is detachably attached to the joint between the outermost protection ring 3 and the support leg 10 . The connecting member 35 includes a plurality of engaging portions 31a and 31b each having an L-shaped cross section that releasably engage with the protective ring 3, and a clamping portion 33 having a U-bolt 32 that detachably clamps the frame 36. , and a connecting plate 34 for integrally connecting the engaging portions 31a and 31b and the holding portion 33. As shown in FIG. A plurality of engaging portions 31a and 31b are arranged with a gap d1 in the longitudinal direction of the coupling plate 34 (circumferential direction of the protection ring 3). A locking rod 37 is fixed so as to protrude toward 31b.

A gap d2 through which the support leg 10 can pass is provided between the tip portion 37a of the locking rod 37 and the other engaging portion 31b. A gap d3 into which the support leg 10 can enter is provided between the locking rod 37 and the connecting plate 34, and this gap widens from the proximal end 37b of the locking rod 37 toward the distal end 37a. A locking bolt 38 for fixing the support leg 10 inserted between the locking rod 37 and the connecting plate 34 is attached to the locking rod 37 from the outer surface of the connecting plate 34 (the surface to which the clamping portion 33 is fixed). screwed toward.

When attaching the diameter-enlarging attachment 30 to the outermost protective ring 3 , the frame 36 is arranged to surround the protective ring 3 . After that, as shown in FIGS. 2 and 3, a plurality of connecting members 35 are attached to the joints 13 (inverted T-shaped portions) between the supporting legs 10 and the protective ring 3, respectively. In this case, the connecting member 35 is arranged outside the protective ring 3 near the joint 13, the support leg 10 is inserted into the gap d2 between the tip 37a of the locking rod 37 and the engaging portion 31b, and the engaging portions 31a and 31b are inserted. After the protective ring 3 is sandwiched from above, the entire connecting member 35 is moved counterclockwise (in the direction of arrow S in FIGS. 2 and 3) along the circumferential direction of the protective ring 3 to support it. The leg 10 is moved into the gap d3 between the locking rod 37 and the connecting plate 34. As shown in FIG.

Since the gap d3 between the locking rod 37 and the connecting plate 34 narrows as it approaches the engaging portion 31a, the supporting leg 10 can be advanced to an appropriate position according to the outer diameter of the supporting leg 10. As shown in FIG. When the supporting leg 10 is sandwiched between the locking rod 37 and the connecting plate 34, the locking bolt 38 is tightened to move the connecting member 35 to the joint 13 (inverted T shape) between the supporting leg 10 and the protective ring 3. part).

After that, as shown in FIGS. 3 and 4, the U-bolt 32 is attached so as to sandwich the frame 36 located on the lower surface side of the holding portion 33, and the nut 39 is tightened from the upper surface side of the holding portion 33. If such work is performed for a plurality of connecting members 35, the frame 36 is held and fixed around the protection ring 3 in a state of surrounding the protection ring 3 with a distance D between them.

After that, if a rotating iron 1 having a rotating surface larger than the outer diameter of the protective ring 3 and smaller than the outer diameter of the frame 36 is attached to the rotation transmitting body 7, the rotating surface of the rotating iron 1 will be similar to that of the existing rotating iron. Since it is wider than the rotating surface, the working efficiency of the remodeled floor leveling device 100 is greatly improved compared to the floor leveling device 99 (see FIG. 1) before the remodeling.

In addition, since the frame 36 is fixed to the protection ring 3 by a plurality of connecting members 35 including the engaging portions 31a and 31b, the connecting plate 34 and the locking rod 37, a plurality of workers can be placed around the frame 36. Once positioned and gripped by the respective frame 36, the modified floor leveling apparatus 100 can be easily lifted and transported.

On the other hand, since the diameter expansion attachment 30 can be attached to and detached from the protective ring 3, the work is performed in the reverse order of the above, the diameter expansion attachment 30 is detached from the protection ring 3, and the rotary iron 1 is replaced with the original rotary iron. For example, the modified floor leveling device 100 can be returned to the state of the floor leveling device 99 before the modification. In this way, by using the diameter expansion attachment 30, rotation with a radius of rotation larger than the radius of rotation of the rotary trowel of the floor leveling device 99 can be performed depending on the size of the floor area of the construction site, the shape of the floor surface, and the like. It can be modified to a modified floor leveling device 100 with a trowel.

The frame 36 constituting the diameter expansion attachment 30 described above is an integrally continuous circular member similar in shape to the protective ring 3, but can be connected and separated from each other like the frame 36X shown in FIGS. It can also be formed by a plurality of segment members 36a and 36b. A frame 36X shown in FIG. 5 is formed of two semicircular segment members 36a and 36b as shown in FIG. The segment members 36a and 36b are formed of metal pipes, and have openings 36e and 36f at one end thereof, and a small diameter portion 36c which can be inserted into and removed from the openings 36e and 36f at the other end. , 36d are provided.

By inserting the small diameter portion 36c of the segment member 36a into the opening 36f of the segment member 36b and inserting the small diameter portion 36d of the segment member 36b into the opening 36e of the segment member 36a, the circular frame 36X shown in FIG. can be formed. In addition, the frame 36X can be separated into the two segment members 36a and 36b shown in FIG. 6 by performing the operation opposite to that described above. can. Since the number of diameter-expanding parts that can be connected/separated from each other is not limited, the frame can be formed with three or more segment members.

Next, diameter expansion attachments 20 and 25, which are other embodiments of the present invention, will be described with reference to FIGS. 7 and 8. FIG. 1 to 4 are denoted by the same reference numerals as those in FIGS. 1 to 4. Description may be omitted.

The diameter expansion attachment 20 shown in FIG. 7 includes a frame 36 that can be arranged so as to surround the protection ring 3 of the floor leveling device 99 (see FIG. 1) before modification, and the frame 36 can be attached to and detached from the protection ring 3. and a plurality of connecting members 21 fixed to each other. The diameter expansion attachment 20 shown in FIG. 7 and the diameter expansion attachment 30 shown in FIG.

Specifically, the locking plate 22 constituting the connecting member 21 has the same shape as the holding portion 33 shown in FIG. affixed to. The mounting positions of the plurality of connecting members 21 in the circumferential direction of the frame 36 correspond to the positions of the joint portions 13 of the protective ring 3 to which the diameter expanding attachments 20 are mounted and to the supporting legs 10 .

When attaching the diameter expansion attachment 20 to the protection ring 3, as shown in FIG. After inserting the joint portion 13 side of the support leg 10 from above the protective ring 3 into the gap d2 between the tip portion 37a of the locking rod 37 and the engaging portion 31b, the entire frame 36 is turned over. By rotating the support leg 10 clockwise (in the direction of arrow S) to enter the gap d3 between the locking rod 37 and the connecting plate 34, and then tightening the locking bolt 38 of each connecting member 21, By fixing the connecting member 21 near the joint portion 13, the frame 36 is fixed to the protection ring 3, and mounting of the diameter expansion attachment 20 is completed.

To remove the diameter expansion attachment 20, after loosening the locking bolts 38 of the respective connecting members 21, the entire frame 36 is rotated clockwise (in the direction opposite to the arrow S), and the work described above is reversed. Therefore, attachment and detachment of the diameter expansion attachment 20 is easy.

The diameter expansion attachment 25 shown in FIG. 8 includes a frame 36 that can be arranged so as to surround the protection ring 3 of the floor leveling device 99 (see FIG. 1) before modification, and the frame 36 can be attached to and detached from the protection ring 3. and a plurality of connecting members 26 that are fixed to. The diameter expansion attachment 25 shown in FIG. 8 and the diameter expansion attachment 20 shown in FIG.

Specifically, the locking plate 27 constituting the connecting member 26 has the same shape as the locking plate 22 shown in FIG. It is secured to an arcuate tubular body 28 . Tubular body 28 is attached to the outer periphery of frame 36 . Since the inner diameter of the tubular body 28 is equal to or larger than the outer diameter of the frame 36, and the radius of curvature of the tubular body 28 is the same as the radius of curvature of the frame 36, the plurality of tubular bodies 28 are arranged in the circumferential direction of the frame 36 together with the connecting member 26. It is slidable along (direction of arrow R).

Therefore, the positions of the plurality of connecting members 26 in the circumferential direction of the frame 36 can be changed according to the positions of the joint portions 13 of the protective ring 3 to which the diameter expanding attachments 25 are attached and the support legs 10 .

When attaching the diameter expansion attachment 25 to the protection ring 3, as shown in FIG. 10, and from above the protective ring 3, the joint 13 side of the support leg 10 enters the gap d2 between the tip 37a of the locking rod 37 and the engaging portion 31b. After that, the connecting member 26 is rotated counterclockwise together with the tubular body 28 to allow the support leg 10 to enter the gap d3 between the locking rod 37 and the connecting plate 34, and then the respective connecting members 26 are locked. By tightening the bolts 38, the connecting member 26 is fixed near the joint 13, thereby fixing the frame 36 to the protection ring 3, and the mounting of the diameter expansion attachment 25 is completed.

When removing the diameter expansion attachment 25, after loosening the locking bolts 38 of the respective connecting members 26, the connecting members 26 are rotated clockwise along the circumferential direction of the frame 36 together with the tubular body 28. , the attachment and detachment of the diameter expansion attachment 25 is easy.

Next, based on FIGS. 9 to 13, the modified floor leveling device 200, the diameter expanding attachment 50, etc. will be described.

As shown in FIGS. 9 and 10, the floor leveling device 199 before modification is also called a horse-riding trowel, and includes a plurality of power-type rotating trowels that rotate like propellers while contacting the floor surface F to be leveled. 11, 12, and protective rings 201, 202 arranged to cover the rotating regions of the rotating irons 11, 12 for ensuring safety. A plurality of support legs 203 and 204 extend downward from the mounting base 205, and a protective ring 202 is attached to the lower end sides of the support legs 203 and 204. As shown in FIG.

A riding section 16 for a worker (not shown) to sit on is provided above the mounting base 205, and a prime mover 14 for driving the rotary irons 11 and 12 and a motor 14 are provided below the riding section 16. A power transmission mechanism 15 for decelerating the rotation of the prime mover 14 and transmitting it to the rotating irons 11 and 12 is arranged. H2 is arranged upright.

The rotation of the output shaft 15a of the power transmission mechanism 15 mounted on the mounting base 205 is transmitted from a plurality of radial arms provided below the mounting base 205 via a plurality of pulleys P1, P2, P3 and belts B1, B2. is transmitted to the rotation transmission body 7. Rotary irons 11 and 12 are attached to the distal ends of the plurality of rotation transmitting bodies 7 via paperweight-like fixing members 8 and screws 9, respectively. By loosening the screw 9 , the rotating iron 1 can be attached to and detached from the rotation transmitting body 7 together with the fixing member 8 .

A modified floor leveling device 200 is formed by attaching the diameter expanding attachment 50 to the floor leveling device 199 before modification. The diameter expansion attachment 50 includes a frame 51 and a plurality of connecting members 35 and 40. As shown in FIG. The frame 51 has an elliptical shape with longer and shorter diameters than the protective ring 202 located on the outermost periphery. A plurality of connecting members 35 and 40 are fixing means for the frame 51 . The frame 51 is arranged so as to surround the protection ring 202 located on the outermost periphery, and is detachably fixed to the protection ring 202 via a plurality of connecting members 35 and 40 .

The connecting member 35 shown in FIGS. 9 and 10 has the same structure and function as the connecting member 35 shown in FIGS. and the protective ring 203 in the vicinity of joints 53 and 54, the protective ring 202 and the frame 51 arranged to surround the protective ring 202 are detachably fixed.

The connecting member 40 shown in FIG. 9 has the function of detachably fixing the protective ring 202 and the frame 51 . As shown in FIG. 13, the connecting member 40 includes a plurality of vertically overlapping holding members 41 and 42, and bolts 43 and wing nuts 44 that hold the overlapping holding members 41 and 42 in that state. there is Both end portions of the holding members 41 and 42 are provided with short gutter-shaped holding portions 41a, 41b, 42a and 42b, respectively.

As shown in FIG. 13, the protective ring 202 is sandwiched between the sandwiching portions 41a and 42a, the frame 51 is sandwiched between the sandwiching portions 41b and 42b, and the intermediate portions between the sandwiching portions 41a and 42a and the sandwiching portions 41b and 42b are sandwiched. By tightening the bolt 43 and the wing nut 44 located nearby, the protection ring 202 and the frame 51 are fixed with the distance D therebetween.

As shown in FIG. 9, around the protection ring 202, a frame 51 arranged in a state surrounding the protection ring 3 with a distance D between the protection ring 202 and the protection ring 202 is held by a plurality of connecting members 35 and 40. Once fixed, a plurality of rotating irons 11 and 12, which rotate within the range of the frame 51 and have a larger rotating surface than the rotating blade (not shown) before remodeling that rotates within the range of the protective ring 202, are connected to the rotation transmission body. 7, the modified floor leveling device 200 is completed.

The modified floor leveling device 200 is used in the same way as the floor leveling device 199 before modification. By gripping it with left and right hands and tilting it forward, backward, leftward, and rightward, the entire remodeled floor leveling device 200 can be moved forward and backward, moved left and right, and changed direction. As described above, since the rotating surfaces of the rotating irons 11 and 12 are wider than the rotating surfaces of the rotating irons before the modification, the work of the modified floor leveling device 200 is easier than that of the floor leveling device 199 before the modification. Efficiency is greatly improved.

In addition, since the frame 51 is fixed to the protective ring 202 by a plurality of connecting members 35 and 40, a plurality of workers can be arranged around the frame 51 and grip the frame 51, respectively, to level the modified floor surface. The device 200 can be easily picked up and carried.

On the other hand, since the diameter expansion attachment 50 is detachable from the protection ring 202, the operation is performed in the reverse order of the above, the diameter expansion attachment 50 is removed from the protection ring 202, and the rotary irons 11 and 12 are replaced with the original rotary irons. After replacement, the modified floor leveling device 200 can be restored to the state of the floor leveling device 199 before the modification. In this way, by using the diameter expansion attachment 50, rotation with a radius of rotation larger than the radius of rotation of the rotary trowel of the floor leveling device 199 can be performed depending on the size of the floor area of the construction site, the shape of the floor surface, and the like. It can be modified to a modified floor leveling device 100 with a trowel.

The frame 51 constituting the diameter-expanding attachment 50 described above is an integrally continuous oval member similar in shape to the protective ring 202, but like a frame 51X shown in FIG. segment members 51a, 51b, 51c, and 51d. A frame 51X shown in FIG. 11 is formed of two semicircular segment members 51a and 51b and two linear segment members 51c and 51d as shown in FIG.

The segment members 51a, 51b, 51c and 51d are all formed of metal pipes, and both ends of the segment members 51c and 51d are openings 51h, 51i, 51j and 51k. are provided with small-diameter portions 51e, 51f (51g, 51h) that can be inserted into and removed from openings 51h, 51j (51i, 51k), respectively.

The small diameter portions 51e and 51f of the segment member 51a are inserted into the opening portions 51h and 51j of the segment members 51c and 51d, and the small diameter portions 51g and 51h of the segment member 51b are inserted into the opening portions 51i and 51k of the segment members 51c and 51d. By inserting, an oblong frame 51X shown in FIG. 11 can be formed. Further, by performing the operation in reverse order, the frame 51X can be separated into the four segment members 51a, 51b, 51c and 51d shown in FIG. can be reduced. Since the number of diameter-expanding parts that can be connected and separated from each other is not limited, the frame can be formed with four or more segment members.

Next, connecting members 60 and 70 of other embodiments will be described with reference to FIGS. 14 and 15. FIG. Both the connecting member 60 shown in FIG. 14 and the connecting member 70 shown in FIG. 15 can be used in place of the connecting member 40 shown in FIG.

A connecting member 60 shown in FIG. 14 includes two holding members 61 and 62 connected via a hinge portion 65 so as to be opened and closed so as to overlap and separate from each other, and the overlapping holding members 61 and 62 . A bolt 63 and a wing nut 64 are provided to hold it in that state. Both end portions of the holding members 61 and 62 are provided with short gutter-shaped holding portions 61a, 61b, 62a and 62b, respectively. Flat plate-like engaging portions 61c and 62c are provided at the ends of the holding members 61 and 62 opposite to the hinge portion 65 (outside the holding portions 61b and 62b). A wing nut 64 is screwed to the tip of the bolt 63 projecting from the engaging portion 61c.

As shown in FIG. 14, after the protective ring 202 is placed on the clamping portion 62a and the frame 51 is placed on the clamping portion 62b, the hinge portion 65 is closed to clamp the protective ring 202 between the clamping portions 61a and 62a. At the same time, after the frame 51 is sandwiched between the sandwiching portions 61b and 62b, the bolt 63 is inserted through the opposing engaging portions 61c and 62c from bottom to top, and the bolt 63 protruding from the engaging portion 61c is inserted. The protection ring 202 and the frame 51 are fixed with the distance D therebetween by screwing the wing nut 64 to the tip side of the frame 51 and tightening it.

Next, a connecting member 70 shown in FIG. , 72 in that state. Both end portions of the holding members 71 and 72 are provided with short gutter-shaped holding portions 71a, 71b, 72a and 72b, respectively. Plate-like engaging portions 71c and 72c are provided at the ends of the clamping members 71 and 72 opposite to the hinge portion 73 (outside the clamping portions 71b and 72b). Between the portions where the holding members 71 and 72 face each other vertically (the portions where the holding portions 71a and 72a and the holding portions 71b and 72b face each other) and between the portions where the engaging portions 71c and 72c face each other vertically. Magnets 74 and 75 are sandwiched between them, respectively.

As shown in FIG. 15, the protective ring 202 is placed on the clamping portion 72a, the frame 51 is placed on the clamping portion 72b, and the magnet 74 is attracted onto the clamping member 72 between the clamping portions 72a and 72b. After the magnet 75 is attracted onto the engaging portion 72c, the hinge portion 73 is closed to clamp the protective ring 202 between the clamping portions 71a and 72a, and the frame 51 is clamped between the clamping portions 71b and 72b. In this state, the holding members 71 and 72 are held facing each other by the magnetic force of the magnets 74 and 75, so that the protection ring 202 and the frame 51 are fixed with the distance D therebetween.

The magnets 74 and 75 constituting the connecting member 70 shown in FIG. 15 are not limited, but the magnets 74 and 75 are strong enough to attract and hold the clamping members 71 and 72 to the extent that they do not separate during use of the modified floor leveling device 200 shown in FIG. A magnet having a strong magnetic force (for example, a samarium-cobalt magnet, a neodymium magnet, a praseodymium magnet, etc.) is suitable.

The connecting members 40, 60, and 70 shown in FIGS. 13, 14, and 15 can be used as fixing means for the frame 51 in the modified floor leveling device 200 shown in FIG. 9, but are limited to this. Therefore, it can also be used as fixing means for the frame 36 in the modified floor leveling apparatus 100 shown in FIG.

1 to 15, the remodeling method of the floor leveling device, the remodeled floor leveling devices 100 and 200, and the diameter expansion attachments 30, 20, 25, and 50 are the floor leveling device according to the present invention. The modified method of the floor leveling device, the modified floor leveling device, and the diameter expanding attachment are illustrated, and the floor leveling device modifying method, the modified floor leveling device, and the diameter expanding attachment according to the present invention are the above-mentioned floor surface. The modification method of the leveling device, the modified floor leveling device 100, 200, and the diameter expansion attachments 30, 20, 25, 50 are not limited.

INDUSTRIAL APPLICABILITY The floor leveling device and diameter expanding attachment according to the present invention can be widely used in industrial fields such as the civil engineering and construction industry and the civil engineering and construction industry that perform construction work on concrete floor surfaces, mortar floor surfaces, and the like.

Reference Signs List 1, 11, 12 Rotary iron 2, 3, 202, 203 Protection ring 4, 205 Mounting base 5, 14 Motor 6 Reduction gear 7 Rotation transmission body 8 Fixed member 9 Screw 10, 203, 204 Support leg 13 Joint 15 Power transmission Mechanism 15a Output shaft 16 Boarding portion 21, 26, 35, 40, 60, 70 Connecting member 22, 27 Locking plate 20, 25, 30, 50 Diameter expansion attachment 28 Tubular body 31a, 31b, 61c, 62c, 71c, 72c Engagement portion 32 U-bolts 33, 41a, 41b, 42a, 42b, 61a, 61b, 62a, 62b, 71a, 71b, 72a, 72b Holding portion 34 Coupling plate 36, 36X, 51, 51X Diameter expansion frame 36a, 36b, 51a, 51b, 51c, 51d Segment member 36c, 36d, 51e, 51f, 51g, 51h Small diameter portion 36e, 36f, 51h, 51i, 51j, 51k Opening 37 Locking rod 37a Tip 37b Base end 38 Locking Bolt 39 Nut 41, 42, 61, 62, 71, 72 Holding member 43, 63 Bolt 44, 64 Wing nut 65, 73 Hinge part 74, 75 Magnet 99, 199 Floor leveling device before modification 100, 200 Modified floor Surface leveling device d1, d2, d3 Gap D Distance F Floor surface to be leveled H1, H2 Operation handle P1, P2, P3 Pulley W Welded part

Claims (8)

It is detachably attached to a floor leveling device having a power-type rotary trowel that rotates like a propeller while contacting the floor surface to be worked, and a protective ring arranged so as to cover the rotating area of the rotary trowel. A diameter expansion attachment comprising: a frame that can be arranged in a state surrounding the outermost protective ring; and a fixing means that holds the frame in a state surrounding the protective ring. Expansion attachment. 2. The diameter expanding attachment according to claim 1, wherein said fixing means is a connecting member detachably interposed between said protection ring and said frame. The connecting member includes an engaging portion that removably engages with at least the outermost protective ring, and a holding portion that is integrated with the engaging portion and removably holds the frame. 3. The diameter expanding attachment according to claim 2 . 2. The diameter expanding attachment according to claim 1, wherein said fixing means is a connecting member fixed to said frame and removable from said protective ring or a connecting member fixed to said protective ring and removable from said frame. The diameter expanding attachment according to any one of claims 1 to 4, wherein the frame is formed of a plurality of segment members that can be connected and separated from each other. The diameter expanding attachment according to any one of claims 1 to 5, wherein the frame has a similar shape to the outermost protective ring. A floor leveling device equipped with a power-type rotary trowel that rotates like a propeller while contacting a floor surface to be worked on, and a protective ring arranged to cover the rotating area of the rotary trowel. Item 7. A method for remodeling a floor leveling device to which the diameter-expanding attachment according to any one of items 1 to 6 is attached. A power-type rotating iron that rotates like a propeller while contacting the floor surface to be worked, and a protection ring arranged to cover the rotation area of the rotating iron. A modified floor leveling device with a diameter expansion attachment.

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