KR20210100863A - element mat for assembly - Google Patents

Abstract

The present invention relates to an individual mat for assembly formed into a polygonal plate shape, wherein a stepped part comprising at least one among a groove and a protrusion for combination with an adjacent individual mat is installed on a side of an individual mat for assembly corresponding to a side of a polygon, a stepped groove or a stepped protrusion having a shape matched with a combination surface of the protrusion or the groove on the side of the adjacent individual mat is formed on the combination surface of the protrusion or the groove, and the stepped groove or the stepped protrusion is formed to be laterally asymmetrical when seen from a lateral cross section which is a vertical cross section cut in a lateral direction, and, thus, on a mat installation plane, when two individual mats adjacent to each other are brought close and coupled with each other, the stepped protrusion and the stepped groove coupled with each other on the adjacent individual mats are relatively easily coupled with relatively low power, and, when the two individual mats are spaced apart from each other to be dismantled, the stepped protrusion and the stepped groove coupled with each other are relatively difficultly dismantled with relatively great power. According to the present invention, when a plurality of individual cushion mats are assembled to install all the cushion mats, the installation is easy, which can lead to a reduction in time and effort, and the connection of the individual mats can be prevented from being easily disconnected by an external force toward a side after installation.

Description

individual mats for assembly

The present invention relates to a prefabricated mat, and more particularly, it is laid on the floor in the room to protect children from being injured even if they fall or to prevent noise between floors in a multi-story building such as an apartment. Assembly used to form a prefab mat For individual mats.

Cushion mats are used in general homes and multi-purpose facilities such as kids cafes and nursing homes for the purpose of preventing falls, preventing noise between floors, and preventing musculoskeletal disorders and relieving fatigue in places such as kitchens.

Cushion mats are often formed to cover a large area by simply assembling them by forming interlocking projections and grooves around small square or rectangular individual mats for easy installation and removal as needed.

1 shows such a conventional example. The indoor floor is formed by alternately forming the coupling grooves 3 and the protrusions 4 at regular intervals on the four sides of the square plate-shaped body (1), each with an oblique line on both sides (2), when viewed from above. By combining the protrusions in the coupling grooves according to the area of the assembly in a way to connect in all directions is laid out by assembling a plurality.

In this case, if you look at the connection part of the coupling groove and the protrusion as a complicated zigzag line, your eyes will get tired easily. There were also problems such as taking a lot of time and effort to manage.

2 shows another conventional example. Also, coupling grooves and protrusions are formed on the four sides of the square body, but the coupling grooves and protrusions are not formed in the entire thickness of the body, but are formed only in the lower half of the thickness. From the top, the coupling groove and protrusion are not visible, resulting in a more stable appearance.

However, since all of these prefab mats are usually made of polyurethane foam for their own purposes, they are soft and stretchy, so when pressure or force is applied to the assembly joint, the gap is easy to open, and when water or beverage falls on the mat, it seeps into the gap. There is a risk of damage such as rotting or deforming the floor below. Dust can also enter the crevice, and if the user steps on the raised space on the mat and the floor during activity, the compressed air can come out through the crevice and blow the dust out.

In addition, a gap is formed over the entire thickness, so if only one of the assembly joints of two adjacent mats is pressed, a step difference may occur and a foot tripping phenomenon may occur. Safety accidents such as tripping or, in severe cases, fractures of fingers and toes may occur.

Due to the nature of the mat made of foam material, the coefficient of contraction and expansion according to temperature is rather large. However, if the structure does not have sufficient strength to hold the connection between the mats, there is also a problem that a gap may occur between the mats depending on the temperature even if there is no external force.

Treating the assembly joints and floor with an adhesive material to prevent this problem will lose the benefits of the prefab mat, cumbersome installation and removal, and may damage the floor.

On the other hand, such a prefabricated cushion mat is easy to assemble and on the contrary, it is preferable not to be easily disassembled by an external force during general use in an assembled state. However, in general, if it is easy to assemble, it is easy to disassemble, and if it is not easy to disassemble, it is difficult to assemble.

For example, in order to form an assembled state stably, the assembly connection of the cushion mat can be three-dimensionally made complicated in a way that it is not easily disassembled by pulling it from any direction, but in this case, the bonding direction is up and down. It should be inserted in the direction to be inserted into each other so that it is not easily disassembled even if horizontal force is applied in the assembled state. However, in order to fit each other in the up-down direction, assembly must be done in the up-down direction, so it takes a lot of time and effort for assembling. There was the inconvenience of being difficult.

Korean Patent Publication No. 10-2015-0103416: Prefabricated Mat Japanese Patent Laid-Open No. 2011-247026: Joint Mat

An object of the present invention is to provide an individual mat for assembling that can be used to form a prefabricated mat that is easy to install and can reduce time and effort in the installation process to solve the problems of the conventional prefabricated mat.

An object of the present invention is to provide an individual mat for assembling having a configuration capable of preventing the connection between the individual mats from being easily disassembled, particularly by an external force to the side after installation.

The individual mat for assembling of the present invention for achieving the above object is an individual mat for assembling made of a polygonal plate shape. At least one stepped portion is installed, and a stepped groove or stepped projection having a shape matching with the projection or groove engagement surface of the side of an adjacent individual mat is formed on the mating surface of the groove or projection, and a vertical section cut in the left and right direction is formed. When viewed from a lateral cross section, the stepped groove and the stepped projection are left and right asymmetrical, and the stepped groove or stepped projection is fastened to each other in the adjacent individual mats when the two adjacent mats are laterally adjacent to each other on the mat installation plane. The stepped projection and the stepped groove are fastened to each other easily and with relatively little lateral force, and when the two separate mats are laterally spaced apart from each other to disassemble, the stepped projection and the stepped groove to be fastened to each other are relatively difficult, and a relatively large lateral force It is characterized in that it is made to be dismantled by adding .

In the present invention, in order for the stepped groove and the stepped projection to form an asymmetrical shape, the outer portion of the stepped projection far from the center of each mat may have a gentle slope section, and the inner side of the stepped projection close to the center may have a steep slope. Of course, the corresponding stepped groove to be coupled thereto, when viewed from the center of each mat, has a steeply inclined section on the outer side and a mildly inclined section on the inner part.

More specifically, the stepped protrusion and the stepped groove may have a saw blade shape as an asymmetric shape, and a gentle slope and a steep slope based on the top of the saw blade may have a simple straight shape, and the steep slope may have a curved shape with increasing inclination. As a result, the gentle slope may be formed in a curved shape in which the slope is gradually decreased.

In the present invention, the individual mat for assembly is usually rectangular, and the grooves and protrusions may be alternately installed along the entire perimeter (in case of circumnavigation), and in particular, the grooves and protrusions may be installed in half sections on one side. have. In this case, the grooves or projections may be mutually engaged with the projections or grooves of adjacent sides of adjacent individual mats for the same assembly placed on the floor in the same phase or in the same planar rotational state.

In the present invention, at least one protrusion is installed in the step groove of the individual mat for assembly, and the protrusion groove is installed at a position corresponding to the protrusion in the stepped protrusion. It may be configured to suppress movement in the lateral direction between the two individual mats in the state.

According to the present invention, when assembling a plurality of individual cushion mats to install the entire cushion mat, it is easy to install, thereby reducing time and effort in the installation process, and the connection between individual mats is easily dismantled after installation, especially by external force to the side. can be prevented from becoming

1 is a perspective view showing a state in which two individual mats are coupled to each other in an example of a conventional prefabricated mat;
2 is a perspective view showing an individual mat constituting another example of a conventional prefabricated mat;
3 is a schematic plan view of two separate mats adjacent to each other according to an embodiment of the present invention;
4 is a partial cross-sectional perspective view showing a state in which two separate mats are combined according to an embodiment of the present invention;
5 to 7 are conceptual cross-sectional views showing partially simplified step projections and stepped grooves that are matched with each other when two adjacent individual mats are combined in embodiments according to the present invention;
8A to 8C are a perspective view, a plan view, a sectional view taken along line AA of this plan view, and a partial enlarged view of a part thereof, of another embodiment in which the tip edge portion of the protrusion is processed in a chamfered form;
9A to 9C are a perspective view, a plan view, a sectional view taken along line AA of this plan view, and a partial enlarged view of a part thereof, of another embodiment in which the tip edge portion of the protrusion is treated in a chamfered form;
10A to 10C are a perspective view, a plan view, a cross-sectional view taken along line AA of this plan view, and a partial enlarged view of a part thereof, of another embodiment in which both side corners of the protrusion are processed in a round shape;
11 is a plan conceptual view showing a method and direction of assembling by adding an individual mat to the previously combined individual mats, and showing that both side sides of the protrusion are formed to have an inclination;
12 is a plan view of an individual mat according to another embodiment of the present invention;
13 is a perspective view of an individual mat according to another embodiment of the present invention;
14 to 20 are plan views illustrating various planar shapes of protrusions forming a coupling portion for coupling with an adjacent individual mat in another embodiment of the present invention.

Hereinafter, the present invention will be described in more detail through specific examples with reference to the drawings.

3 and 4 are a plan view of two adjacent mats in a combined state and a partial cross-sectional view in the combined state according to an embodiment of the present invention.

Here, the individual mats 10 and 20 are all formed in the same shape and can be combined with the adjacent individual mats in the same phase, that is, in a state in which the upper and lower positions and the rotational positions are the same. Specifically, protrusions 11) and grooves 17 are provided on each side corresponding to the four sides of the main body of the square, forming a coupling portion in half sections when viewed in the longitudinal direction. These protrusions 11 and grooves 17 are not formed on the entire side of the side, but are formed only on the step portion corresponding to the upper half or the lower half thickness when viewed in the thickness direction of the individual mat.

More specifically, the protrusion 11 of the step portion is in the form of a plate approximately protruding in the right half section when each side of the square is placed on the top in the plan view, and the groove 17 is the protrusion 21 of another individual mat in the left half section It is installed as a concave space of a corresponding shape so that it can be coupled to the .

When two of the same individual mats 10 and 20 formed in this way are placed adjacent to each other left and right on the floor and a force is applied from the side, the protrusions 11 on the adjacent sides of one adjacent individual mat 10 are adjacent to each other of the other adjacent individual mats 20 . While filling the groove space of the side, the facing or engaging surfaces of the protrusion 11 and the groove form a matching state.

For example, on the adjacent sides of two separate mats, the projection 11 of the right individual mat 10 is the groove of the left individual mat 20 , and the projection of the left individual mat 20 is the groove 17 of the right individual mat 10 . ) is bound to

A stepped groove 13 is long formed on the upper surface of the protrusion 11 in the longitudinal direction of the side, and the corresponding surface (surface corresponding to the upper surface) of the groove of another adjacent mat 20 corresponds to the stepped groove 13 . A step protrusion 29 is formed. The stepped protrusion 29 is formed in a position and size that can be coupled to the upper surface stepped groove 13 of the protrusion 11 .

Both ends of the stepped groove 13 in the side direction are blocked by the stepped groove or protruding jaw 15 . Accordingly, when the stepped protrusion 27 is fitted into the stepped groove 13, it is blocked by the protruding jaw 15 and sliding along the stepped groove 13 in the side direction is prevented.

The stepped groove 13 is in the path that beverage or dust passes to reach the floor when beverage or dust flows into the gap between the assembly connection parts of the two separate mats, and the protruding protrusions 15 at both ends form the stepped groove 13 . If there is a small space or gap between the bottom of the stepped groove 13 and the end of the stepped protrusion 23, making it a kind of container that can hold an object, drinks or dust that is actually introduced between the individual mats through the assembly connection gap is this There is a high possibility that they will gather here without passing through the stepped groove.

Here, the projections and grooves as coupling portions respectively formed on the four sides of the square individual mat are formed in half sections over the entire length (overall) of each side, but in a practical sense, they are formed over each side of the adjacent individual mat. For the convenience of assembling the product, both ends in the longitudinal direction of each side may include, for example, a case in which no projections and grooves are formed in less than 10% of the entire section. Avoid and use methods that facilitate assembly.

Individual mats often use polyurethane foam that is easy to stretch and elastic by external forces due to the nature of the prefabricated mats are mainly used for noise prevention and cushioning. Use a coated film. Polyurethane foam is flexible and soft due to the required functions and characteristics of the foam, but it can be easily damaged by external forces and can be easily absorbed. This form can be made by placing a polyurethane coating film on the mold first by insert injection method, and then injecting the material to form the polyurethane foam into the mold to form the foam.

5 is a cross-sectional view of a spaced apart state showing in more detail the shape of protrusions and grooves of adjacent individual mats in an embodiment of the present invention.

The mating surface, which is the upper surface of the protrusion 11 of one individual mat 10, is formed to match the mating surface constituting the groove 27 of the adjacent individual mat 20 in a mating state, and in the stepped groove 13 of the protrusion The width is divided into a mild slope portion (t ₁₁ ) and a steep slope portion (t ₁₂ ) based on the low point, and correspondingly, the width of the step protrusion 29 of the groove 27 space of the other individual mat 20 is also the vertex The gentle slope portion (t ₂₁ ) and the steep slope portion (t ₂₂ ) are divided based on , so that the gentle slope portion and the steep slope portion are also matched with each other.

The gentle slope of the step protrusion is farther out than the steep slope of the stepped protrusion when viewed from the center of the individual mat or the main body, and the mild slope of the step groove is the steep slope of the step groove when viewed from the center of the individual mat or the main body. It is closer to the inside than the part.

When two adjacent sides of the two individual mats approach each other due to a lateral force, the protrusion 11 of one individual mat 10 enters the groove 27 space of the other individual mat 20, and the tip 14 of the protrusion 11 enters the space. ) comes into contact with the outermost starting portion of the mildly inclined portion of the stepped protrusion 29 of the groove 27 . However, the gentle slope is not caught at the tip 14 due to the gentle slope, but as the coupling portion is partially deformed by the elasticity of the individual mats, the stepped projection 29 rides over the tip 14 and moves further to the side, and the step groove (13) Entering into the mat, the two separate mats form a mating state, and the mating surface of the mating part is in a mated state.

On the contrary, when the opposite force is applied to the two individual mats to the side to separate the two individual mats, the steeply inclined portion of the stepped protrusion 29 and the steeply inclined portion of the stepped groove 13 are matched with each other and the locking jaws against each other as a result, it cannot easily move in the direction of separation. And in order to overcome the frictional force opposing this separation and to separate them, a force that is very large compared to the lateral force (horizontal force) that brings the two individual mats close must be applied, or a force in the vertical direction rather than the lateral force must be applied.

Thus, in this embodiment, the absolute value of the lateral force required to join two adjacent mats becomes smaller than the absolute value of the lateral force required to separate these two individual mats, making it easy to join and difficult to separate.

Even in the embodiment disclosed in FIGS. 6 and 7, the absolute value of the lateral force required to couple the two separate mats adjacent to the cross-sectional shape of the stepped protrusion and the stepped groove is smaller than the absolute value of the lateral force required to separate the two separate mats. It is designed so that it is easy to join and difficult to separate.

In the embodiment of Figure 6, the mildly inclined portions (t ₂₁ , t ₁₁ ) occupy the entire width of the stepped protrusion 29 ′ and the stepped groove 13 ′, and the steeply inclined portion is configured to form a substantially vertical plane.

And, in the embodiment of Fig. 5, the gentle slope portion (t ₁₁ , t ₂₁ ) and the steep slope portion (t ₁₂ , t ₂₂ ) have a slope that gradually decreases toward the vertex and a slope that increases toward the vertex while forming a curve, but in the embodiment of Fig. 7 In the step groove 13" and the step protrusion 29", both the mildly inclined portions (t ₁₁ , t ₂₁ ) and the steeply inclined portions (t ₁₂ , t ₂₂ ) form a straight line having a constant inclination.

In the present invention, the configuration of the slightly inclined portion and the steeply inclined portion of the stepped groove and the stepped protrusion may have any other shape as long as the force at the time of coupling is smaller than the force at the time of separation and disassembly due to the action of lateral force. Of course.

8A to 8C and FIGS. 9A to 9C show that the edge of the protrusion tip 14 of each of the previous embodiments of FIGS. 5 to 7 is treated with a chamfered shape 141 instead of an angled edge so that two adjacent pads are combined. It shows other embodiments that do not further prevent the angled corner portion from acting as a locking sill to interfere with the coupling.

Of course, in these other embodiments, the tip portion treated with the chamfered shape 141 of the protrusion for coupling may be processed into a round shape depending on the embodiment. In the corresponding groove of each pad adjacent to the treated tip portion, the corner portion corresponding to the tip edge portion of the original protrusion as shown in FIG. It may be formed as a matching part, or an angled corner part may be formed as it is, as shown in FIG. 9C.

As in the embodiment of FIGS. 8b and 9b, when the protrusion tip of the individual mat is formed in a chamfered or round shape, when assembling or combining the adjacent individual mats on the same floor surface, only slightly push on the floor plane The sea-island product is easy to assemble without easily crossing the step protrusion along the slope of the chamfer or round part and not getting caught.

That is, when constructing as shown in Fig. 11, when additionally combining one individual mat with respect to the three individual mats that have already been combined in the part where 4 individual mats are assembled in a quadrangular shape, two adjacent mats directly touching one individual mat Assembly is easy even with individual mats fixed to the floor.

On the other hand, if the edge of the individual mat is made in a round or chamfered shape, when the individual mat product is molded in the mold, the flow of the raw material flows along the inclined mold surface formed by the round or chamfer, so the flowability of the raw material is good. This is good, and defects in the molding process are reduced, and when the product is taken out of the mold, it is possible to enjoy the effect of being easily demolded from the mold due to the inclined shapes.

On the other hand, as shown in FIG. 11, a single mat that is newly added to the three mats is coupled by approaching approximately 45 degrees from the same floor plane as shown in FIG. 11, as in the embodiment of FIGS. 8b, 9b, and 10b In individual mats, both corners or side edges (the portion indicated by a round circle) on the top view of the protrusion are also beveled or rounded at a 45 degree angle, and preferably the groove matching the protrusion is also inclined or rounded at 45 degrees on both sides in the plan view. It is preferable that the angular portions are formed so as not to interfere with the assembly by being caught with each other.

12 and 13 show an embodiment of the individual mat 30 having grooves 37 and protrusions 31 of different shapes from the individual mats of the preceding embodiment.

Here, unlike the previous embodiment, in the state of being placed on the floor, the projections 31 are formed over the entire side section on the side corresponding to the upper side and the left side, and the grooves 37 are formed over the entire side section on the side corresponding to the lower side and the right side. ) is installed. There is no substantial difference in the shape characteristics of the protrusion 31 and the stepped groove 33 formed in the protrusion 31, the stepped groove or protruding jaw 35, and the groove 37 and the stepped protrusion 39 formed in the groove 37. There is no difference in that it is easy to make a whole prefabricated mat by combining individual mats of the same shape.

However, here, there is a morphological difference in that the protrusion 35 is formed not only at both ends of the stepped groove 33 but also in the middle, and a concave portion corresponding to the protrusion 35 is formed in the middle of the longitudinal direction of the stepped protrusion 39. .

Here again, the stepped groove 33 and the stepped protrusion 39 have an asymmetric shape as shown in FIG. 7 when viewed from a lateral section, which is a vertical section cut in the left and right direction, of the individual mat, and in the mat installation plane, two separate mats adjacent to each other The stepped protrusions and stepped grooves that are fastened to each other in adjacent individual mats are relatively easily fastened to each other when fastening the mats laterally close to each other. It is made to be dismantled with relative difficulty.

In the stepped groove 33 of the protrusion 31, the low point in the cross-sectional view as shown in Fig. 7 is indicated by a single line parallel to the longitudinal direction of the stepped groove in Figs. 12 and 13 in Figs. The overall width is indicated as having a wide width for a mildly inclined portion and a narrower for a steeply inclined portion when viewed from this line.

Similarly, the apex of the stepped protrusion 39 in the cross-sectional view as shown in FIG. 7 is indicated by a single line parallel to the longitudinal direction of the stepped protrusion in FIGS. 12 and 13 in FIGS. 12 and 13, and the total width of the stepped protrusion is this line When viewed as a reference, the gentle slope portion is indicated as having a wide width, and the steep slope portion is indicated as having a narrow width.

14 to 20 are various projections 41, 51, 61, 71, of individual mats of the present invention that can replace the projection 11 on one side of the rectangular body part in the embodiment such as FIG. 3 described above. 81, 91, 101) is a partial plan view.

Although not shown, this groove 17 is formed at the same position as the groove 17 in FIG. Of course, grooves having a shape that can match the shape of the protrusions 41 , 51 , 61 , 71 , 81 , 91 and 101 may be installed instead.

In each of these projections (41, 51, 61, 71, 81, 91, 101), also in each of the two adjacent mats, when assembling the adjacent two separate mats in the horizontal direction, step grooves 43, 53, 63, 73, 83, 93, 103) are formed. The stepped groove may be a simple linear or long rectangular stepped groove 63, 83 as shown in FIGS. 16 or 18, but as shown in FIGS. 14, 17 and 19, the length of the stepped grooves 43, 73, 93 It may be a stepped groove in which the stepped groove projections 45, 75, 95, which can make it difficult to move the stepped projections installed in the groove spaces of adjacent individual mats within the projections, are installed.

In addition, the stepped groove is not a simple linear or rectangular shape, but may be a circular shape as shown in FIG. 15 or a triangle or a pentagonal or more polygonal shape as shown in FIG. 20 .

Of course, even in a stepped groove having such a flat surface, the bottom of the groove has a mildly inclined portion and a steeply inclined portion, and the corresponding shape has a mildly inclined portion and a steeply inclined portion even in the matching stepped projection, so it is easy to combine two adjacent mats in the horizontal direction And, it can be difficult to separate and dismantle in the horizontal direction.

On the other hand, in the individual mat of the present invention, polyurethane foam is mainly used as the material, but other synthetic resin foams may also be used, and durability, unit price, and whether or not harmful substances are included in the material will be considered factors. For example, it is desirable to have mechanical strength capable of maintaining durability.

In the previous embodiment, a harder and more flexible polyurethane coating film that covers the polyurethane foam is used on the upper surface of the body, but when using a foam of a different material for the body, a different material is used so that it can be easily combined without using a separate adhesive. It is possible to use a stretchable coating film made of synthetic resin of the same material as the foam. The reason why elasticity is required as a coating film is that when the polyurethane foam is deformed, the surface must be deformable to serve as a cushion mat well, and if it is not deformed, it is difficult to prevent self-damage such as tearing. In this aspect, in the case of a coating film, film, or plate coupled to the bottom surface, it is possible that there is no elasticity.

The coating film can be applied not only on the upper surface but also on the lower surface, and it is possible to use a coating film having separate properties for the upper surface and the lower surface, and it is also possible to use a viscous coating film on the lower surface to increase the adhesion viscosity with the floor.

In addition to the synthetic resin coating film, nonwoven fabrics can be combined with the bottom of individual mats to enhance cushioning and noise prevention.

On the other hand, it is also possible to form a coating film on the side of the individual mat in which the grooves and protrusions are formed with a water-repellent or waterproof material according to the needs of the prefabricated mat. In this configuration, the coating film prevents beverages from being absorbed into the body by contacting the sides for a long time in stepped grooves, etc. when beverages enter the gaps of the individual mat assembly connections, and to be easily wiped off when removing beverages.

In addition to the water-repellent or waterproof coating film, it is also conceivable to use a viscous coating film or an absorbent coating film on the side of the individual mat. In this case, the bonding force between the individual mats can be further increased, and when small dust particles enter the gap between the assembly joints between the individual mats, the dust particles are adsorbed and adhered, so that the dust particles spread back into the air by idle activities and air indoors. problems that make it worse can be prevented.

In the above, the present invention has been described with reference to limited embodiments, but these are only illustratively described to help the understanding of the present invention, and the present invention is not limited to these specific embodiments. For example, although the embodiment is mainly described with respect to individual mats having a square plane, the present invention can be applied in the same manner to individual mats having an equilateral triangle, regular hexagonal, or regular octagonal plane as other polygons.

Accordingly, those of ordinary skill in the art to which the present invention pertains will be able to make various changes or application examples based on the present invention, and it is natural that such modifications or application examples belong to the appended claims.

10, 20, 30: individual mats
11, 21, 31, 41, 51, 61, 71, 81, 91, 101: projections
13, 23, 33, 43, 53, 63, 73, 83, 93, 103: step groove
14: distal end (distal end of protrusion)
15, 35, 45, 75, 95, 105: protruding jaw
17, 27, 37: groove 19, 29, 39: step projection

Claims (8)

In the individual mat for assembly made of a polygonal plate shape,
A step portion made of at least one of a groove and a protrusion is installed on a side surface of the individual mat for assembling corresponding to the side of the polygon for coupling with an adjacent individual mat,
Step grooves or stepped projections having a shape matching with the projections or grooves on the side surfaces of adjacent individual mats are formed on the mating surfaces of the grooves or protrusions,
When viewed from a lateral cross section, which is a vertical section cut in the left and right direction, the stepped groove and the stepped protrusion have an asymmetric shape, and the stepped groove or the stepped protrusion is fastened by bringing two separate mats adjacent to each other laterally close to each other on the mat installation plane. Individual for assembly, characterized in that it is relatively easily fastened with the stepped protrusion or the stepped groove when doing so, and is made to be dismantled with the stepped protrusion or the stepped groove relatively easily when dismantling the two individual mats apart from each other laterally mat. The method of claim 1,
The individual mat for assembly is rectangular, and the grooves and the projections are installed alternately in case of circumnavigation,
The individual mat for assembling, characterized in that the grooves or the projections are installed so as to be mutually fastened with the projections or grooves on the side adjacent to each side of the same individual mat for assembling placed on the floor in the same phase. 3. The method of claim 2,
An individual mat for assembly, characterized in that the half section of each side is provided with a groove and the other half section is provided with a protrusion. The method of claim 1,
Individual mat for assembly, characterized in that in forming the left-right asymmetric shape, the outside of the stepped projection far from the center of the individual mat has a gentle slope section, and the inside of the stepped projection close to the center has a steep slope. 5. The method of claim 4,
The mildly inclined section forms a curve in a cross section perpendicular to the side so as to have a gradient that increases toward the apex of the step projection,
The steep slope section is an individual mat for assembly, characterized in that it forms a curve or a vertical line in a cross section perpendicular to the side so as to have a slope that gradually decreases toward the apex of the step protrusion. The method of claim 1,
At least one protruding jaw is installed in the stepped groove region of the protrusion, and a protruding jaw groove is installed in the stepped protrusion at a position corresponding to the protruding jaw so that the two individual mats are coupled to each other in a state where the two adjacent mats are coupled to each other. An individual mat for assembly, characterized in that it is made to suppress the movement in the side direction between the. 7. The method of claim 1 or 6,
In a plan view (viewed from above), the stepped groove is formed of a polygon of linear, circular, or triangular or more in the same direction as the side within the projection, and the stepped projection is linear, circular, or triangular or more in a shape matching the stepped groove. Individual mats for assembly, characterized in that made of polygons. 7. The method according to any one of claims 1 to 6,
The step protrusions 29, 29' of the groove are treated by treating the edge portion of the tip 14 of the protrusion in the form of a chamfer 141 or a round 143 to move and combine two adjacent individual mats for assembly in a plane. 29") individual mat for assembly, characterized in that it does not act as an obstacle such as a snag.

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