JP6646834B2 - Tread - Google Patents

Description

  The present invention relates to a tread forming a tread of a stair.

2. Description of the Related Art Conventionally, treads that are arranged as step boards of stairs and constitute tread surfaces have been known. As such a tread, there has been known a structure in which a cushioning material is provided at the corner in order to reduce an impact at the time of contact with an upper corner on the front side when climbing.
For example, Patent Literature 1 below discloses a tread having a configuration in which a buffer block is adhered and embedded in the nosing of a tread body.

Japanese Utility Model Publication No. Hei 1-86628

  However, in the treads described in Patent Literature 1, when a load is applied to the nose, the buffer block is greatly deformed as compared with the tread main body, and peeling at the adhesive interface between the tread main body and the buffer block is likely to occur. It can be considered.

  The present invention has been made in view of the above-described circumstances, and it is possible to improve the fixing strength of the cushioning member to the tread plate main body while having a configuration in which the cushioning member is provided at a corner on one side in the thickness direction to be the tread surface. It is intended to provide treads.

In order to achieve the above object, the tread according to the present invention is configured such that the tread is opened toward one side in the thickness direction and one side in the depth direction at a corner between one surface in the thickness direction and one end surface in the depth direction of the tread plate body. A tread provided with a cushioning member in the provided recess, wherein the cushioning member is formed of a soft resin portion disposed to constitute the corner portion of the tread plate, and a soft resin portion and the recess. boundary of a hard resin portion of the rigid than arranged to position the soft resin portion between the inner surface, but integrally molded structure as being, the buffer member and the depth direction one end face of said step plate body The part is provided with a narrow groove that opens toward one side in the depth direction of the tread, and the inner surface of the recess of the tread body is provided with an engagement groove, while the hard resin part has An engagement projection fitted into the engagement groove is provided. .

  The tread plate according to the present invention has the above-described configuration, and has a configuration in which the cushioning member is provided at a corner portion on one side in the thickness direction to be the tread surface, while improving the fixing strength of the cushioning member to the tread plate body. Can be done.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partially broken schematic longitudinal sectional view which shows typically an example of the tread according to one Embodiment of this invention. It is a partially broken schematic plan view which shows typically an example of the tread main body of the tread. FIG. 3 is a partially broken schematic exploded longitudinal sectional view in which a part of the tread plate is omitted. FIG. 3 is a partially exploded schematic longitudinal sectional view of the tread plate. It is a partially broken schematic longitudinal sectional view showing typically an example of a tread concerning another embodiment of the present invention. FIG. 3 is a partially broken schematic exploded longitudinal sectional view in which a part of the tread plate is omitted.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In some of the drawings, some of the detailed reference numerals attached to other drawings are omitted.
In the following embodiments, the front side is the front, the opposite side is the rear, and the front-rear direction is the depth direction of the tread plate, based on the state facing the installed tread plate from the lower floor side, The directions such as the vertical direction will be described based on the state.

1 to 4 are diagrams schematically illustrating an example of the tread according to the first embodiment.
As shown in FIGS. 1 to 3, the tread 1 according to the present embodiment has a thickness direction at a corner between one surface (upper surface) 11 in the thickness direction of the tread body 10 and one end surface (front end surface) 13 in the depth direction. The recess 14 is provided so as to open toward one side (upper side) and one side (front side) in the depth direction. The tread 1 has a configuration in which the buffer member 20 is provided in the recess 14. With such a configuration, it is possible to impart cushioning to a corner on one end surface (front end surface) side in the depth direction of one surface (upper surface) in the thickness direction, which is the tread surface of the tread plate 1, The impact at the time of contact can be reduced.

  Further, the cushioning member 20 is disposed so as to be located between the soft resin portion 21 and the inner surfaces 15 and 16 of the concave portion 14 so as to form a corner portion of the tread 1. The hard resin portion 24 that is harder than the soft resin portion 21 is integrally formed. In the present embodiment, the engaging grooves 15 a are provided on the inner surfaces 15 and 16 of the recesses 14 of the tread plate main body 10, and the engaging protrusions 29 fitted into the engaging grooves 15 a are formed on the hard resin portion 24. The configuration is provided. With such a configuration, the cushioning member 20 is firmly fixed to the tread main body 10 by the engagement protrusion 29 made of hard resin, as compared with a configuration in which the cushioning member 20 is formed only of soft resin and fixed to the tread main body 10. can do. Also, even when the cushioning member 20 and the tread main body 10 are fixed with an adhesive, the amount of deformation of the hard resin portion 24 with respect to the tread main body 10 when a load is applied can be reduced. Can also be improved.

  In the present embodiment, the hard resin portion 24 includes the side surface portion 16 facing the one side (front side) of the recess 14 of the tread plate main body 10 in the tread plate depth direction and the other side (rear side) of the soft resin portion 21 in the tread plate depth direction. And a first hard resin portion 25 arranged so as to be located between the first and second hard resin portions 25. With such a configuration, since the soft resin portion 21 and the first hard resin portion 25 are integrally formed, even when a load is applied, it is difficult for a step to be formed at these boundaries. Further, since the first hard resin portion 25 is hard, even when a load is applied, a step formed at the boundary with the tread plate main body 10 can be reduced. Thereby, while the cushioning property at the corners is ensured by the soft resin portion 21, it is possible to make it difficult for the user to feel uncomfortable when stepping on. Further, since the first hard resin portion 25 is integrally formed so as to be continuous with the portion provided with the engagement protrusion 29, the first hard resin portion 25 is fitted into the engagement groove 15a even when a load is applied. The deformation of the first hard resin portion 25 can be more effectively reduced by the engagement protrusion 29.

In addition, the surface 21a, 21b, 25a, 28a of the cushioning member 20 is covered in a series, and the surface decorative sheet 30 is adhered so as to cover the upper surface 11 and the front end surface 13 of the treadboard main body 10. With such a configuration, the buffer member 20 can be made less noticeable, and the appearance can be improved.
Further, the hard resin portion 24 is provided between the bottom portion 15 facing the one side (upper side) in the tread plate thickness direction of the recess 14 of the tread plate main body 10 and the other side (lower side) in the tread plate thickness direction of the soft resin portion 21. The second hard resin portion 28 is provided so as to be located at the position indicated by the arrow mark. In other words, the cushioning member 20 is made up of the soft resin portion 21, the first hard resin portion 25 arranged between the side portion 16 of the recess 14 and the soft resin portion 21, and the bottom portion of the recess 14. 15 and the second hard resin portion 28 disposed so as to be located between the soft resin portion 21 and the soft resin portion 21. In addition, the first hard resin portion 25 and the second hard resin portion 28 include the surfaces 25a and 28a including the surfaces 21a and 21b of the soft resin portion 21 in a series, and the upper surface 11 and the front end surface 13 of the tread plate main body 10 are covered. The surface decorative sheet 30 is stuck so as to cover. With such a configuration, since the first hard resin portion 25 and the second hard resin portion 28 are hard, even when a load is applied, the step formed at the boundary with the tread plate main body 10 is reduced. can do. Thereby, breakage of the surface decorative sheet 30 when a load is applied can be suppressed. Further, even when the cushioning member 20 and the tread main body 10 are fixed with an adhesive, the amount of deformation of the first hard resin portion 25 and the second hard resin portion 28 with respect to the tread main body 10 when a load is applied is reduced. Therefore, the interfacial strength can be further improved.

Further, in the present embodiment, the tread 1 is provided with the marking member 32 attached to the attachment groove 17 provided so as to open upward on the rear side of the soft resin portion 21. With such a configuration, the visibility of the front end corner on the upper surface side of the tread plate 1 can be improved or the anti-slip property can be improved by the marking member 32.
In the present embodiment, the marking member 32 is attached to the mounting groove 17 so as to press the ends 31, 31 of the surface decorative sheet 30 at both edges of the opening of the mounting groove 17. With such a configuration, the decorative face sheet 30 adhered to the upper surface 11 is divided by the marking member 32, and the damage of the decorative face sheet 30 can be more effectively suppressed. In addition, since the end portions 31, 31 of the surface decorative sheet 30 at both edges of the opening of the mounting groove 17 can be pressed by the marking member 32, peeling at the divided part of the surface decorative sheet 30 can be suppressed.

  Further, in the present embodiment, the above-described mounting groove 17 is referred to as a first mounting groove 17, and a second mounting groove 18 provided so as to open upward on the rear side of the first mounting groove 17 is provided. The second sign member 32 is attached. According to such a configuration, the visibility of the front end corner on the upper surface side of the treadle 1 can be further improved by the above-described sign member (first sign member) 32 and the second sign member 32. Further, similarly to the above, the second sign member 32 is attached to the second attachment groove 18 so as to press the ends 31, 31 of the surface decorative sheet 30 at both edges of the opening of the second attachment groove 18. With such a configuration, similarly to the above, it is possible to suppress the peeling at the divided part of the surface decorative sheet 30.

  In the present embodiment, a narrow groove 19 that opens toward the front side is provided at the boundary between the front end surface 13 of the tread plate main body 10 and the cushioning member 20. With such a configuration, the boundary between the front end surface 13 of the tread plate main body 10 and the cushioning member 20 is formed on the groove bottom side of the narrow groove 19. This reduces the amount of deformation that occurs at the boundary when a load is applied, as compared with the case where the boundary between the front end surface 13 of the tread plate main body 10 and the cushioning member 20 is flat and flat. Can be. As a result, the strength of the bonding interface between the tread main body 10 and the cushioning member 20 at the site can be effectively improved. In addition, breakage of the surface decorative sheet 30 at the site can be more effectively suppressed. Moreover, if the surface decorative sheet 30 is configured to be stuck to the inner surface of the narrow groove 19 in a series, the narrow groove 19 also functions as a decorative groove, and the boundary between the tread main body 10 and the cushioning member 20 is shown by show-through. It is possible to suppress the portion from being conspicuous. Further, in the present embodiment, since the portion where the narrow groove 19 is formed by the front end surface 13 of the tread plate main body 10 is the second hard resin portion 28, the amount of deformation generated at the boundary portion when a load is applied is reduced. It can be effectively reduced.

  The tread plate 1 is arranged as a step board of a stair so that the thickness direction is along the vertical direction so that the upper surface 11 side of the tread body 10 constitutes a tread of the stair. The shape of the tread 1 in plan view may be an appropriate shape according to the staircase structure in which the tread 1 is provided. For example, when the stairs are arranged in a straight staircase (straight stairs), all of the plurality of treads 1 forming the stairs may be formed in a substantially rectangular flat plate that is long in the stairs width direction. In this case, the tread plate 1 disposed in the surrounding portion may have a substantially triangular shape or the like in plan view. In addition, the tread 1 may be arranged such that both end portions in the stair width direction are fixed to side girders or the like. Further, the tread 1 may be constructed as a so-called open staircase (strip stair) without a riser, or may be constructed such that a riser is joined to the lower side of the front end so as to form a nose at the front end. Good. In this case, a configuration may be provided in which a groove or the like for receiving the upper end of the riser plate is provided on the lower surface side of the front end of the tread plate 1.

  The dimension of the tread 1 along the stair width direction may be appropriately set in accordance with the various stair structures as described above and the stair width dimension of the installation location. The dimension of the tread 1 along the step width direction may be such that the step width dimension (inward dimension) in the installed state is 600 mm or more, and preferably, the step width dimension (inward dimension) is set to be equal to or greater than 600 mm. The dimension may be 750 mm or more. Further, the depth dimension of the tread 1 may be appropriately set from the viewpoint of the location where the tread 1 is installed, walking stability when climbing up and down stairs, and the like. The depth dimension of the tread 1 may be, for example, 150 mm or more, and preferably 210 mm or more. In addition, the thickness of the tread 1 may be set as appropriate according to the support structure of the tread 1 and the like from the viewpoint of the strength of the tread 1 and the like. The thickness of the tread 1 may be 20 mm or more, preferably 35 mm or more.

The tread main body 10 is substantially flat. The shape of the tread main body 10 as viewed in a direction along the step width direction is substantially uniform throughout. FIG. 2 shows an example in which the tread main body 10 is formed in a substantially rectangular shape which is long in a direction along the stair width direction in plan view, but the stair structure in which the tread 1 is arranged as described above. Various shapes such as a substantially square shape, a substantially trapezoidal shape, a substantially triangular shape, a substantially rhombic shape, and a substantially fan shape in plan view may be used according to the above.
The upper surface 11 of the tread main body 10 and the lower surface 12 as the other surface in the thickness direction are substantially parallel, and the front end surface 13 of the tread main body 10 is substantially orthogonal to the upper surface 11 and the lower surface 12. I have. In the illustrated example, an example is shown in which an R-chamfered chamfer is provided at a corner between the lower surface 12 and the front end surface 13.

As shown in FIGS. 2 and 3, the recess 14 is provided so as to cut off a corner between the upper surface 11 of the tread plate main body 10 and the front end surface 13, and is provided in the entire direction along the step width direction. I have. The recess 14 is defined by a bottom surface portion 15 facing upward and a side surface portion 16 facing forward. The bottom surface portion 15 and the side surface portion 16 are formed so as to be substantially orthogonal to each other. The bottom surface portion 15 is substantially parallel to the upper surface 11 of the tread plate main body 10, and the side surface portion 16 is a front end of the tread plate main body 10. It is substantially parallel to the surface 13.
Further, a concave step portion 13a forming a narrow groove 19 (see FIG. 1) is provided at a corner between the front end surface 13 of the tread plate main body 10 and the bottom portion 15 of the concave portion 14. The concave step portion 13a is provided in a notch shape so as to open toward the front side and the upper side and extend in a direction along the step width direction of the tread plate main body 10. In the present embodiment, the inner surface of the concave step 13a has a concave curved surface shape.

The engagement groove 15a is provided entirely so as to open on the inner surfaces 15, 16 of the recess 14 and extend in a direction along the stepwise width direction. In the present embodiment, the engagement groove 15a is provided on the bottom surface 15 so as to open upward. Further, the engagement groove 15a is provided so as to be opened at an intermediate portion of the bottom surface portion 15 in the front-rear direction. In the illustrated example, an example is shown in which the engagement groove 15a is provided so as to be opened at a position on the rear side of the center of the bottom surface 15 in the front-rear direction. Further, an example is shown in which the engagement groove 15a is formed in a substantially rectangular groove shape which is substantially rectangular when viewed in a direction along the step width direction (groove longitudinal direction).
The depth of the engaging groove 15a in the thickness direction of the tread plate and the width of the groove in the depth direction of the tread plate are appropriately determined so that the engagement protrusion 29 of the cushioning member 20 described later can be fitted. ing.
In the illustrated example, the bottom surface portion 15 has a stepped shape such that the rear portion of the engagement groove 15a on the bottom portion 15 is located above the front portion of the engagement groove 15a.

  The first mounting groove 17 is provided throughout so as to extend in a direction along the step width direction. In the present embodiment, as shown in FIGS. 1 and 4, the first mounting groove 17 is formed by a gap between the side surface portion 16 of the recess 14 and the first hard resin portion 25 of the cushioning member 20. That is, the first mounting groove 17 is provided between the side surface portion 16 of the recess 14 and the first hard resin portion 25 so as to open upward. With such a configuration, for example, as compared with a structure in which a mounting groove is provided at a boundary between the soft resin portion 21 and the first hard resin portion 25 of the cushioning member 20, the first sign member 32 is used as the tread plate main body. 10 and the first hard resin portion 25 enable stable support. Also, for example, even when the decorative surface sheet 30 is not stuck to the tread 1, the boundary portion on the tread side between the tread main body 10 and the cushioning member 20 can be put in a parting shape by the first sign member 32, and the appearance is improved. Can be improved.

That is, the side surface portion 16 of the recess 14 constitutes the groove inner surface on one side in the groove width direction of the first mounting groove 17, and the first hard resin portion 25 is formed on the groove on the other side in the groove width direction of the first mounting groove 17. Configure the inner surface. Further, a stopper fastening piece 26 of the cushioning member 20 described later forms a groove bottom of the first mounting groove 17.
Further, in the present embodiment, a first marking member, which will be described later, is provided at a corner between the upper surface 11 and the side surface 16 of the tread plate main body 10 which constitutes a rear side edge of both edges of the opening of the first mounting groove 17. A recessed step 11a for receiving the flange 33a of the head 33 of the 32 is provided. The concave stepped portion 11a is notched throughout so as to open toward the center and upper side in the groove width direction of the first mounting groove 17 and extend in the direction along the step width direction of the tread plate main body 10. It is provided in. In the illustrated example, an example is shown in which the concave stepped portion 11a is partitioned by a bottom surface facing upward and an inclined side surface inclined downward from the upper surface 11 toward the bottom surface.

  Further, in the present embodiment, a receiving recess 16a is provided on the side surface 16 of the recess 14 for receiving a distal end of a fastener fastening piece 26 of the cushioning member 20 described later. The receiving recess 16a is provided in a cutout shape so as to open toward the front side and extend in a direction along the step width direction of the tread plate body 10. In the illustrated example, an example is shown in which the receiving recess 16a is provided so as to open at the lower end portion of the side surface portion 16. Further, an example is shown in which the receiving recess 16a is formed in a substantially rectangular groove shape in a substantially rectangular shape when viewed in a direction along the step width direction (groove longitudinal direction). In addition, an example is shown in which a groove inner side surface facing the upper side, which is one side in the groove width direction of the receiving recess 16a, is provided in a series on the rear side portion of the bottom surface portion 15. In addition, an example is shown in which a corner having a C-chamfered shape is provided at a corner between the inner surface facing the lower side which is the other side in the groove width direction of the receiving recess 16a and the side surface portion 16.

The second mounting groove 18 is provided throughout so as to extend in a direction along the step width direction. The second mounting groove 18 is opened upward on the upper surface 11 of the tread plate main body 10 at a position spaced rearward from the first mounting groove 17 so as to be parallel to the first mounting groove 17. It is provided to be. The distance between the first mounting groove 17 and the second mounting groove 18 in the front-rear direction may be an appropriate distance from the viewpoint of improving the visibility and non-slip properties of the sign members 32, 32 attached thereto. It may be about 5 mm to 30 mm.
Further, in the illustrated example, an example is shown in which the second mounting groove 18 is formed in a substantially rectangular groove shape in a substantially rectangular shape when viewed in a direction along the step width direction (groove longitudinal direction).
Further, the second mounting groove 18 is provided with concave steps 11a, 11a similar to those described above at both edges of the opening.
The depth of the mounting grooves 17 and 18 along the thickness of the tread plate and the width of the groove along the depth of the tread plate are set so that the engagement protrusions 34 and 34 of the marking members 32 and 32 described later can be fitted. It has appropriate dimensions.

  Note that the tread main body 10 may be formed of a wood-based material, a synthetic resin-based material, a metal-based material, or the like. Examples of the wood-based material include wood-based laminates such as plywood and LVL (single-ply laminate), wood-based boards such as particle board, insulation board, MDF (medium density fiber board), and wood-based fiber board such as hard board. And the like. In addition, the wood-based material may be a wood flour / plastic composite material (WPC) containing wood powder, a synthetic resin-based material, an inorganic filler, a compatibilizer, a colorant, and the like at a predetermined content ratio. Further, the tread main body 10 may have a multi-layer structure in which plate materials made of these various materials are laminated. For example, a structure in which MDF or the like is laminated on both front and back surfaces of a base material such as a plywood is used. It may be a thing. The recess 14 including the engagement groove 15a, the receiving recess 16a, and the like, and the second mounting groove 18 may be formed at the time of molding, or may be formed by cutting or the like.

As shown in FIGS. 1 and 3, the cushioning member 20 is attached to the tread main body 10 so as to cover the recess 14 of the tread main body 10. The cushioning member 20 is provided throughout the step board main body 10 in the direction along the step width direction, and is elongated in the direction along the step width direction. The shape of the cushioning member 20 as viewed in the longitudinal direction is substantially uniform over the entire length.
In the present embodiment, the cushioning member 20 has a configuration in which the first hard resin portion 25 and the second hard resin portion 28 are integrally formed so as to be continuous. That is, the first hard resin portion 25 and the second hard resin portion 28 are integrally formed so as to be continuous with each other so as to be located on the rear side and the lower side of the soft resin portion 21. With such a configuration, the first hard resin portion 25 and the second hard resin portion 28 are provided in a series along the side surface portion 16 and the bottom surface portion 15 of the recess 14. This makes it possible to reduce the deformation of each of the hard resin portions 25 and 28 when a load is applied, as compared with the case where the first hard resin portion 25 and the second hard resin portion 28 are separated. it can. As a result, breakage of the surface decorative sheet 30 can be more effectively suppressed, and the strength of the bonding interface between the tread body 10 and the cushioning member 20 can be effectively improved.

The cushioning member 20 is formed of a synthetic resin material, and the soft resin portion 21 and the hard resin portion (the first hard resin portion 25 and the second hard resin portion 28) 24 are formed of different materials (simultaneous composite of different materials). It may be a resin molded product such as an extrusion molded product or an injection molded product integrally formed by molding or the like. In the present embodiment, the first hard resin portion 25 and the second hard resin portion 28 are formed of the same material (the same resin composition).
The hardness of the soft resin portion 21 and the hardness of the hard resin portion 24 is determined in consideration of securing a buffering function and the load at the boundary portion between the soft resin portion 21 and the hard resin portion 24 and the boundary portion between the hard resin portion 24 and the tread plate main body 10. May be appropriately set from the viewpoint of reducing the level difference generated when the image is applied. For example, the soft resin part 21 is formed from a soft resin composition having a Shore A hardness of about 40 to 80, and the hard resin part 24 is formed from a hard resin composition having a Shore A hardness of about 60 to 100. May be used.
In the present embodiment, the soft resin portion 21 is formed from a soft resin composition having a Shore A hardness of 50 or more and less than 70. The hard resin portion (the first hard resin portion 25 and the second hard resin portion 28) 24 is formed of a hard resin composition having a Shore A hardness of 70 or more and less than 90. The difference in Shore A hardness between the soft resin composition and the hard resin composition is set to 10 or more.

  If the Shore A hardness of the soft resin composition constituting the soft resin portion 21 is too low, it tends to be deformed, so that it tends to be bottom-butted, and it is difficult to alleviate the impact. Tends to be difficult. Further, if the Shore A hardness of the hard resin composition constituting the hard resin portion 24 is too low, the hardness difference with the tread body 10 tends to increase, while if it is too high, the hardness with the soft resin portion 21 tends to increase. The difference tends to increase, and the step formed at the boundary between the hard resin portion 24 and a portion adjacent thereto tends to increase. If the difference in Shore A hardness between the soft resin composition forming the soft resin portion 21 and the hard resin composition forming the hard resin portion 24 is too small, the buffer function of the soft resin portion 21 tends to be small. . With the above configuration, the difference in hardness between the adjacent parts does not become too large, and the feeling of incongruity when stepping on is less likely to occur while securing an appropriate buffer function by the soft resin portion 21. can do. Moreover, breakage of the surface decorative sheet 30 can be suppressed more effectively.

  The Shore A hardness of the soft resin composition constituting the soft resin part 21 and the hard resin composition constituting the hard resin part 24 is a hardness measured using a type A durometer according to JIS K7215. Further, the Shore A hardness may be measured by preparing test pieces made of a resin composition constituting the soft resin part 21 and the hard resin part 24 and measuring each test piece. Further, the soft resin portion 21 and the hard resin portion 24 may be integrally formed using a soft resin composition and a hard resin composition having the above-mentioned Shore A hardness after curing.

Further, in the present embodiment, the soft resin portion 21 and the hard resin portion (the first hard resin portion 25 and the second hard resin portion 28) 24 are made of the same resin as the main component, and The configuration is such that the content of the plasticizer with respect to the component is larger than that of the hard resin portion 24. With such a configuration, these boundary portions are formed so as to be mixed with each other by affinity, and even when a load is applied, the soft resin portion 21 and the hard resin portion 24 are separated from each other at the boundary portion. Can be suppressed. Further, by setting the content of the plasticizer with respect to the resin main component of the soft resin portion 21 to be higher than that of the hard resin portion 24, the soft resin portion 21 can be softer than the hard resin portion 24.
As the main resin component of the resin composition constituting each of the soft resin portion 21 and the hard resin portion 24, any resin can be used as long as the hardness can be varied by varying the content of the plasticizer. In this embodiment, a polyvinyl chloride resin is used.

  The polyvinyl chloride resin may have a degree of polymerization of about 1,000 to 3,000. If the degree of polymerization of the polyvinyl chloride resin is too low, the crystallinity, elasticity (restorability after deformation) and dimensional stability tend to be low, while if the degree of polymerization is too high, Fluidity tends to decrease. From such a viewpoint, the degree of polymerization of the polyvinyl chloride resin may be set to the above degree. The degree of polymerization of the polyvinyl chloride resin as the main resin component of the soft resin composition constituting the soft resin portion 21 and the degree of polymerization of the polyvinyl chloride resin as the main resin component of the hard resin composition constituting the hard resin portion 24 are described. The degree of polymerization may be the same or different. From the above viewpoint, for example, the degree of polymerization of the polyvinyl chloride resin constituting the hard resin composition may be lower than the degree of polymerization of the polyvinyl chloride resin constituting the soft resin composition.

As the plasticizer added to the resin main component, a phthalate ester type, a polyester type, and other various plasticizers may be employed. Examples of phthalate esters include DIDP (diisodecyl phthalate), DINP (diisononyl phthalate), DOP (dioctyl phthalate), and DBP (dibutyl phthalate). As such a plasticizer, a DIDP or polyester plasticizer may be preferably employed from the viewpoint of low migration.
In addition, the content of the plasticizer with respect to the main resin component of the resin composition constituting the soft resin portion 21 and the hard resin portion 24 is different from the viewpoint of securing the buffer function and the difference in hardness between adjacent portions as described above. May be set as appropriate from the viewpoint of reducing. For example, the soft resin composition constituting the soft resin portion 21 may be a composition in which a plasticizer of 80 to 140 parts (parts by mass) is added to 100 parts (parts by mass) of the resin main component. Further, the hard resin composition constituting the hard resin portion 24 may be such that a plasticizer of 60 to 100 parts (parts by mass) is added to 100 parts (parts by mass) of the resin main component.

The soft resin portion 21 is arranged so as to form a front end corner on the upper surface side of the tread 1. The soft resin portion 21 has an upper surface 21a constituting an upper surface facing the upper surface 11 of the tread plate main body 10, and a front surface 21b constituting a front facing surface has a front end surface 13a. It is provided so that it may become substantially the same plane shape. In the present embodiment, the corner portion between the upper surface 21a and the front surface 21b of the soft resin portion 21 is provided with a chamfer having the same R-chamfer shape as the front end corner on the lower surface 12 side of the tread plate main body 10.
The soft resin portion 21 has a substantially rectangular shape when viewed in a direction along the step width direction. In the illustrated example, the surface facing the rear side of the soft resin portion 21 and the surface facing the front side of the first hard resin portion 25 are shown in a plane, and the surface facing the lower side of the soft resin portion 21 and the second hard resin portion are shown. Although the surface facing the upper side of 28 is shown in a planar shape, the boundary portion may be in a mixed state.

  Further, in the present embodiment, the soft resin portion 21 has a substantially rectangular shape in which the dimension along the vertical direction is larger than the dimension along the front-rear direction when viewed in the direction along the step width direction. The dimension of the soft resin portion 21 along the front-rear direction and the dimension along the up-down direction are determined from the viewpoint of securing a buffer function, the viewpoint of walking stability when stepping on, the viewpoint of the strength of the tread plate main body 10, and the tread plate main body. It may be appropriately set according to the thickness of 10. The size of the soft resin portion 21 along the front-rear direction and the size along the vertical direction may be, for example, about 4 mm to 20 mm, and preferably about 7 mm to 15 mm. In addition, the dimension of the soft resin portion 21 along the front-rear direction and the dimension along the vertical direction may be set to be equal to or less than の of the thickness of the tread main body 10, and preferably 1 / th of the thickness of the tread main body 10. It may be three or less. In the illustrated example, an example in which the dimension along the front-rear direction and the dimension along the up-down direction of the soft resin portion 21 is about 2/7 of the thickness dimension of the tread body 10 is shown.

  In the present embodiment, the soft resin portion 21 is provided with a hollow portion 22. The hollow portion 22 may be provided so as to penetrate the entire length of the soft resin portion 21. The number and position of the hollow portions 22 and the shape and area of the hollow portions 22 as viewed in the longitudinal direction are appropriately set from the viewpoint of securing a cushioning function and the viewpoint of walking stability when stepped on. It may be. In the illustrated example, an example is shown in which a single hollow portion 22 is provided so as to be located below the soft resin portion 21 in the vertical direction. In the illustrated example, the single hollow portion 22 having a circular shape when viewed in the longitudinal direction is positioned at an equal distance from each of the first hard resin portion 25 and the second hard resin portion 28. An example is shown. Further, an example is shown in which the hollow portion 22 is formed in a circular shape whose diameter is about 1/3 of the dimension along the front-rear direction of the soft resin portion 21 when viewed in the longitudinal direction. Note that the hollow portion 22 provided in the soft resin portion 21 is not limited to such an embodiment, and various other modifications are possible.

The first hard resin part 25 is provided between the rear side of the soft resin part 21 and the side surface part 16 of the recess 14 of the tread plate main body 10.
The first hard resin portion 25 is provided so as to be flush with the upper surface 25a of the upper surface 11 of the tread plate main body 10 and to be continuous with the upper surface 21a of the soft resin portion 21. Have been.
In the present embodiment, the first hard resin portion 25 has a configuration in which an inclined surface portion 25d that is inclined so as to descend toward the front side is provided at a front side corner portion of an upper end portion which is one side end portion in the thickness direction of the tread plate. I have. Further, a protruding piece 23 projecting rearward is provided at a rear end corner of the soft resin part 21 on the upper surface 21a side so as to cover the inclined surface part 25d. With such a configuration, even when a load is applied, the step formed at the boundary between the first hard resin portion 25 and the soft resin portion 21 can be reduced more effectively. As a result, uncomfortable feeling when stepping can be made harder to occur, and breakage of the surface decorative sheet 30 can be more effectively suppressed.

Further, in the present embodiment, a first marking member, which will be described later, is provided at a rear side corner of the upper end of the first hard resin portion 25 which forms a front side edge of both edges of the opening of the first mounting groove 17. A concave step 25b for receiving the flange 33a of the head 33 of the 32 is provided. The concave step 25b is substantially the same as the concave step 11a of the tread plate main body 10 described above, and is opened toward the center and the upper side in the groove width direction of the first mounting groove 17, and the first hard resin part 25 is formed. Is provided over the entire length so as to extend in the direction (longitudinal direction) along the step width direction.
Further, in the present embodiment, a configuration in which a plurality of locking grooves 25c are provided on a surface facing the rear side of the first hard resin portion 25, which constitutes the groove inner surface on the other side in the groove width direction of the first mounting groove 17. And These locking grooves 25c are provided in parallel with each other so as to extend over the entire length of the first hard resin portion 25 and are vertically spaced. Further, in the illustrated example, an example is shown in which the locking grooves 25c are provided in parallel from the upper end of the first hard resin portion 25 to a fastener fastening piece 26 described later.

Further, in the present embodiment, the first hard resin portion 25 is provided with a stopper fastening piece portion 26 arranged so as to form the groove bottom of the first mounting groove 17. In other words, a portion of the first hard resin portion 25 that forms the groove bottom of the first mounting groove 17 is a stopper fixing portion. With such a configuration, the stopper fastening piece 26 is covered by the first indicating member 32, so that the buffer member 20 can be stopped without making the fasteners such as nails, staples, screws, etc. stand out. Thereby, it can be firmly fixed to the tread plate main body 10.
The stopper fixing piece 26 is provided so as to protrude rearward from a lower end portion of the first hard resin portion 25 and extends over the entire length of the first hard resin portion 25. Further, the stopper fastening piece portion 26 is configured such that a rear end portion serving as a leading end portion in the protruding direction is inserted into a receiving recess 16a provided on the side surface portion 16 of the recess 14 of the tread plate main body 10 described above. I have. With such a configuration, even when the groove width dimension of the first mounting groove 17 is relatively small, the dimension of the fastener fastening piece portion 26 along the front-rear direction can be increased, and In other words, it is possible to suppress a so-called breakage in which the stopper is fixed to the tip of the stopper fixing piece 26 or the like. Thereby, the stopper fixing piece 26 can be effectively fixed to the tread main body 10 by the stopper.

  In the present embodiment, the lower surface of the cushioning member 20 (the second hard resin portion 28) is brought into contact with the bottom surface portion 15 of the recess 14, and the fastener is not fastened to the fastener fastening piece 26. Thus, a gap is formed between the lower surface of the fastener fastening piece portion 26 and the bottom surface portion 15 with which this lower surface abuts. That is, the stopper fixing piece 26 is deformed (elastically deformed), and is brought into contact with and fixed to the bottom surface 15 so as to be pressed by the stopper. With such a configuration, when the fastener is fastened to the fastener fastening piece 26 and the fastener fastening piece 26 is in contact with the bottom surface 15, the fastener fastening piece 26 is The restoring force (elastic restoring force) acts so as to press the lower surface of the cushioning member 20 (the second hard resin portion 28) against the bottom portion 15 of the recess 14. Thereby, the cushioning member 20 can be firmly fixed to the tread main body 10. In the illustrated example, the stopper fixing piece 26 is brought into contact with the rear side portion of the stepped bottom portion 15 and the inner side surface of the groove facing the upper side of the receiving recess 16a connected thereto, and the buffer member 20 An example is shown in which the lower surface of the (second hard resin portion 28) is brought into contact with the front side portion of the bottom surface portion 15.

The dimension along the front-rear direction and the dimension along the up-and-down direction, which is the protrusion dimension of the fastener fastening piece 26, may be appropriately set from the viewpoint of securing the fastener and reducing the size of the fastener. The dimension along the front-rear direction of the stopper fixing piece 26 may be larger than the groove width dimension of the first mounting groove 17, and may be, for example, about 3 mm to 10 mm. Further, the dimension of the stopper fastening piece 26 in the vertical direction may be smaller than the dimension of the stopper fastening piece 26 in the front-rear direction, for example, about 1.5 mm to 5 mm.
Further, in the illustrated example, an R-chamfered chamfered portion is provided on a lower surface side corner of the front end portion of the stopper fastening piece 26 in the protruding direction. Further, in the illustrated example, in order to make the base end portion of the stopper fastening piece portion 26 in the protruding direction thinner to facilitate deformation, the lower end side corner of the base end portion of the stopper fastening piece portion 26 in the protruding direction is provided. An example is shown in which a concave portion is provided over the entire length so as to extend in the longitudinal direction.

The dimension along the front-rear direction of the first hard resin portion 25 (the dimension along the front-rear direction from the rear-facing surface constituting the inner surface of the other side of the first mounting groove 17 in the groove width direction). May be set as appropriate from the viewpoint of reducing the step at the boundary portion generated when a load is applied, from the viewpoint of achieving compactness, and the like. The dimension of the first hard resin portion 25 along the front-rear direction may be about 1 mm to 10 mm, and preferably about 2 mm to 5 mm.
Further, in the present embodiment, the engagement protrusion 29 is provided so as to be continuous with the lower side of the first hard resin portion 25 and to protrude downward. With such a configuration, the engagement protrusion 29 is located immediately below the first hard resin portion 25, and when the engagement protrusion 29 is fitted into the engagement groove 15 a of the tread plate main body 10, the first hard resin By pressing the part 25, it can be fitted smoothly.

That is, in the present embodiment, the engagement protrusion 29 is provided so as to project downward from the corner between the first hard resin portion 25 and the second hard resin portion 28. The engagement protrusion 29 is provided over the entire length of the cushioning member 20. The engagement projection 29 has a substantially flat shape that is arranged in the front-rear direction along the thickness direction.
Further, in the present embodiment, on both sides in the thickness direction of the engagement protrusion 29, there are provided retaining pieces 29a, 29a which are brought into contact with both inner surfaces of the engagement groove 15a with deformation. . Further, a plurality (three in the example in the drawing) of retaining pieces 29a, 29a are provided at intervals on the both sides in the thickness direction of the engagement protrusion 29 on each side in the thickness direction. These retaining pieces 29a, 29a are fin-shaped (fin-shaped) and are provided in an inclined state so as to incline upward in the natural state from the base end to the distal end. Further, the retaining pieces 29a, 29a may be provided over the entire length of the cushioning member 20.

A dimension along the front-rear direction in a state before the engagement protrusion 29 is fitted into the engagement groove 15a (the retaining pieces 29a, 29a are in a natural state) (from the tip of the retaining piece 29a on one side to the retaining piece on the other side). 29a) is larger than the groove width of the engagement groove 15a. The dimension of the engagement protrusion 29 in the front-rear direction may be appropriately set so that the engagement protrusion 29 is hard to come off in the state of being fitted into the engagement groove 15a.
The dimension along the up-down direction, which is the size of the projection of the engagement protrusion 29 protruding from the lower surface of the second hard resin portion 28, is set to the depth of the engagement groove 15a so that the engagement protrusion 29 can be fitted into the engagement groove 15a. The following may be used. In the illustrated example, the dimension along the vertical direction of the engagement protrusion 29 is set between the tip of the engagement protrusion 29 and the groove bottom of the engagement groove 15a in a state where the engagement protrusion 29 is fitted into the engagement groove 15a. An example is shown in which the engagement groove 15a is smaller than the groove depth dimension so that a slight gap is formed.

Further, the surface of the first hard resin portion 25 which is the base end side of the engagement protrusion 29 and faces rearward below the fastener fastening piece portion 26 is located on the front side of the stepped bottom portion 15. It is configured to be in contact with the facing step wall.
It should be noted that the engaging protrusions 29 are provided on both sides in the thickness direction of the engaging protrusions 29 in place of the retaining pieces 29a, 29a which are brought into contact with the inner surfaces of the engaging grooves 15a with deformation. It is also possible to provide a mode in which locking projections or the like for deforming the inner surfaces of both grooves are provided.

The second hard resin portion 28 is provided so as to be located between the lower side of the soft resin portion 21 and the bottom portion 15 of the recess 14 of the tread plate main body 10.
The second hard resin portion 28 is flush with the front end surface 13 of the tread plate main body 10 so as to be substantially flush with the front end surface 13 of the tread plate body 10 and is continuous with the front surface 21b of the soft resin portion 21. Is provided.
In the present embodiment, the second hard resin portion 28 has a configuration in which a concave step portion 28b that forms the narrow groove 19 (see FIG. 1) is provided in the lower corner of the front end portion. The concave step portion 28b is provided over the entire length so as to open toward the front side and the lower side and extend in a direction (longitudinal direction) along the step width direction of the second hard resin portion 28. . In the present embodiment, the inner surface of the concave step portion 28b has a concave curved surface shape, like the concave step portion 13a provided on the tread plate main body 10 described above.

When the cushioning member 20 is attached to the recess 14 of the tread main body 10, the narrow groove opening toward the front side is formed by the concave step 28b of the second hard resin portion 28 and the concave step 13a of the tread main body 10. 19 are provided over the whole in the step width direction. In this embodiment, the concave step 13a of the tread plate main body 10 and the concave step 28b of the cushioning member 20 (the second hard resin portion 28) form half of the narrow groove 19 in the groove width direction. The configuration is such that step portions 13a and 28b are provided.
In the present embodiment, the concave step portions 13a and 28b are provided so that the narrow groove 19 has a tapered groove shape that expands from the groove bottom toward the opening when viewed in the groove longitudinal direction. I have. With such a configuration, it is possible to suppress the peeling off of the surface decorative sheet 30 adhered to the inner surface of the narrow groove 19 as compared with the case where the narrow groove 19 is formed in a rectangular groove shape. Further, in the present embodiment, the groove bottom side of the narrow groove 19 has a concave curved surface shape formed so as to be continuous with both surfaces in the groove width direction. With such a configuration, it is possible to more effectively suppress the peeling of the surface decorative sheet 30 adhered to the inner surface of the narrow groove 19 and the like.

Further, in the example of the figure, an example is shown in which an R-chamfered chamfer is provided at both edges of the opening of the narrow groove 19.
Further, in the illustrated example, an example is shown in which the narrow groove 19 is formed in a substantially semicircular groove shape when viewed in the groove longitudinal direction. , A substantially trapezoidal groove or the like, or a substantially rectangular groove or the like.
In addition, the groove width dimension and the groove depth dimension of the narrow groove 19 may be set appropriately according to the dimension along the vertical direction of the second hard resin portion 28 and from the viewpoint of appearance. For example, it may be about 0.5 mm to 3 mm.

  The lower surface of the second hard resin portion 28 is a flat surface, and is in contact with the bottom surface 15 of the recess 14. The vertical dimension of the second hard resin portion 28 may be set as appropriate from the viewpoint of reducing a step at a boundary portion generated when a load is applied, from the viewpoint of achieving compactness, and the like. In the present embodiment, the dimension of the second hard resin portion 28 in the vertical direction is smaller than the dimension of the first hard resin portion 25 in the front-rear direction. The vertical dimension of the second hard resin portion 28 may be, for example, about 0.5 mm to 10 mm, and preferably about 1 mm to 3 mm.

  As shown in FIG. 3, the cushioning member 20 having the above-described configuration fits the engagement protrusion 29 into the engagement groove 15a of the tread plate main body 10, and stops it on the stopper fastening piece 26 as shown in FIG. The components may be fixed and attached. Further, the cushioning member 20 may be attached to the recess 14 of the tread body 10 using an adhesive. For example, the lower surface of the second hard resin portion 28 and the bottom portion 15 of the recess 14 may be fixed via an adhesive. Further, the surface of the first hard resin portion 25 facing the rear side below the fastener fastening piece portion 26 and the step wall surface facing the front side of the bottom portion 15 may be fixed via an adhesive. . Further, the lower surface of the stopper fastening piece 26 and the bottom surface 15 of the recess 14 may be fixed via an adhesive. Further, both sides in the thickness direction of the engagement protrusion 29 and the inner surfaces of both grooves of the engagement groove 15a may be fixed via an adhesive.

  The surface decorative sheet 30 has a thin sheet shape (film shape), and may be, for example, a synthetic resin sheet or a veneer made of natural wood (precious wood). As shown in FIG. 4, the surface decorative sheet 30 has an upper surface 25a of the first hard resin portion 25, an upper surface 21a and a front surface 21b of the soft resin portion 21, a front surface 28a of the second hard resin portion 28, and a front end of the treadboard main body 10. It is stuck on the surface 13 in a series. Further, in the present embodiment, the surface decorative sheet 30 is stuck in a series on the inner surface of the narrow groove 19 formed at the boundary between the second hard resin portion 28 and the front end surface 13 of the tread plate main body 10. . Further, a surface decorative sheet 30 is stuck so as to cover the upper surface 11 of the tread body 10.

The surface decorative sheet 30 on the upper surface 11 side of the tread plate main body 10 may be affixed so as to exclude portions where the above-described mounting grooves 17 and 18 are provided. Alternatively, after the surface decorative sheet 30 is stuck in a series on the upper surface 11 of the tread plate main body 10 and the upper surfaces 25a, 21a of the cushioning member 20, a portion arranged to cover the mounting grooves 17, 18 is cut off or the like. It may be attached to the upper surface 11 side of the tread plate main body 10.
The surface decorative sheet 30 stuck on the upper surface 11 side of the tread body 10 in this manner has a portion stuck to the concave step portions 25b, 11a, 11a, 11a at both edges of the openings of the mounting grooves 17, 18. The ends 31, 31, 31, 31 of the mounting grooves 17, 18 on both sides of the opening are formed.
In addition, the surface decorative sheet 30 is adhered in a series from the front end surface 13 to the lower surface 12 of the tread body 10. In addition, it is good also as a structure which stuck the surface decorative sheet 30 also to the rear end surface as the other end surface of the depth direction of the tread main body 10. Further, a configuration in which the surface decorative sheet 30 or an appropriate edge sheet or the like is attached to both or one of both end surfaces in the step width direction of the tread plate main body 10 may be adopted.

As shown in FIGS. 1 and 4, the first marking member 32 and the second marking member 32 are attached to the mounting grooves 17, 31 so as to press the ends 31, 31 of the surface decorative sheet 30 attached as described above. 18. In the present embodiment, the first sign member 32 and the second sign member 32 have the same size and the same shape, that is, the same parts. The marking members 32 are provided over the entire step board 1 in the step width direction.
Further, in the present embodiment, these marking members 32, 32 are provided with heads 33, 33 exposed on the upper surface side of the tread plate 1, and engagement projections 34, 34 to be fitted into the respective mounting grooves 17, 18. Configuration.

  The heads 33, 33 have a dimension along the front-rear direction larger than the groove width dimension of the mounting grooves 17, 18, and both ends in the front-rear direction have flanges 33 a, which press the ends 31, 31 of the surface decorative sheet 30. 33a, 33a and 33a. In the present embodiment, the upper surfaces of the flanges 33a, 33a, 33a, 33a on both sides in the front-rear direction of the heads 33, 33 are inclined so as to descend toward the tips of the flanges 33a, 33a, 33a, 33a. It has an inclined surface. Further, in a state where each of the marking members 32, 32 is attached to each of the mounting grooves 17, 18, a top face of the head 33, 33 at the central portion in the front-rear direction is adhered to the upper surface 11 of the tread body 10. The upper surface of the sheet 30 is substantially flush with the upper surface. Further, in a state where the respective marking members 32, 32 are attached to the respective attachment grooves 17, 18, the concave step portions 25b, 11a, 11a, 11a are provided on both sides in the front-rear direction of the respective heads 33, 33 in the stair width direction. When viewed in the direction along, a substantially V-shaped narrow groove is formed. With such a configuration, it is possible to improve the anti-slip property at the relevant site.

The engagement protrusions 34 are provided over the entire length of each of the marking members 32. These engagement projections 34, 34 have a substantially flat shape that is arranged along the thickness direction in the front-rear direction.
Further, in the present embodiment, on both sides in the thickness direction of the engagement projections 34, 34, the inner surfaces of both mounting grooves 17, 18 are deformed in substantially the same manner as the engagement projections 29 of the cushioning member 20. It has a structure in which the retaining piece portions 34a, 34a to be abutted are provided. Further, a plurality of (three in the example in the figure) retaining pieces 34a, 34a are provided at intervals on the both sides in the thickness direction of each of the engaging projections 34, 34 in the thickness direction. Similar to the above, the retaining piece portions 34a, 34a are provided in an inclined state so as to be inclined upward in the natural state from the base end side toward the distal end side. Further, these retaining pieces 34a, 34a may be provided over the entire length of each of the marking members 32, 32. In addition, a retaining piece 34 a provided on the front side of the engaging projection 34 of the first indicating member 32 is configured to be locked in each locking groove 25 c of the first hard resin portion 25.

A dimension along the front-rear direction before the engagement projections 34, 34 are fitted into the mounting grooves 17, 18 (the front-rear direction from the tip of the one-side retaining piece 34a to the tip of the other-side retaining piece 34a). Is larger than the groove width dimension of each of the mounting grooves 17 and 18 as described above. The dimensions of the engagement protrusions 34 in the front-rear direction may be appropriately set such that the engagement protrusions 34, 34 are hardly removed when fitted into the mounting grooves 17, 18.
The dimensions along the up-down direction, which are the dimensions of the engagement projections 34, 34 projecting from the heads 33, 33, are set so that the engagement projections 34, 34 can be fitted into the respective attachment grooves 17, 18. It may be smaller than the depth dimension. In the illustrated example, similarly to the above, in a state where the engaging projections 34 are fitted into the mounting grooves 17, between the tip of the engaging projections 34 and the groove bottom of the mounting grooves 17, 18. 2 shows an example in which a slight gap is formed.

In addition, each of the marking members 32, 32 may be mounted by fitting each of the engagement protrusions 34 into each of the mounting grooves 17, 18. Further, similarly to the above, a configuration may be adopted in which the respective marking members 32, 32 are attached to the respective attachment grooves 17, 18 via an adhesive. Further, the surface decorative sheet 30 adhered so as to cover the mounting grooves 17 and 18 as described above is attached to the marking members 32 and 32 such that the decorative members 32 and 32 are broken or pushed away. It is good also as what was done.
Further, each of the marking members 32, 32 may be formed of a hard synthetic resin-based material, or may have the same hardness as the hard resin portion 24 of the cushioning member 20. For example, it may be formed from the same resin composition as the hard resin portion 24 of the buffer member 20. Further, at least the upper surface portion of the heads 33, 33 of each of the marking members 32, 32 may have a light storing property.

Next, an example of a tread according to another embodiment of the present invention will be described with reference to the drawings.
5 and 6 are diagrams schematically illustrating an example of the tread according to the second embodiment.
The differences from the first embodiment will be mainly described, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

As shown in FIG. 5 and FIG. 6, the configuration of the cushioning member 20A, the marking member 32A, and the recess 14A of the tread plate main body 10A is different from the first embodiment in the tread plate 1A according to the present embodiment.
In the present embodiment, the soft resin portion 21A of the cushioning member 20A has a substantially rectangular shape when viewed in the direction along the step width direction, and has a dimension in the front-rear direction larger than that in the vertical direction. Further, the soft resin portion 21A is not provided with the hollow portion 22 and the projecting portion 23 as described above. Further, the present embodiment is configured such that the inclined surface portion 25d as described above is not provided at the upper end portion of the first hard resin portion 25A of the hard resin portion 24A.
In this embodiment, the mounting groove (first mounting groove) 17A is provided in the first hard resin portion 25A. With such a configuration, the sign member (first sign member) 32A is formed of the first hard resin as compared with a structure in which a mounting groove is provided at the boundary between the soft resin portion 21 and the first hard resin portion 25A. It can be stably supported by the portion 25A. Further, compared with the first embodiment, the first mounting groove 17A can be provided with higher accuracy, and the first indicating member 32A can be supported more stably.

That is, both inner surfaces and the groove bottom of the first mounting groove 17A are formed in a series by the first hard resin portion 25A. Further, the configuration is such that concave step portions 25Ab, 25Ab similar to the above are provided at both edges of the opening of the first mounting groove 17A. Further, in the illustrated example, the inner surfaces of both grooves of the first mounting groove 17A are flat, but the same locking as described above is performed on both or one of the inner surfaces of both grooves of the first mounting groove 17A. A configuration in which the groove 25c is provided may be employed.
The portion of the first hard resin portion 25A that defines the groove inner surface facing the rear side of the first mounting groove 17A, that is, the dimension along the front-rear direction of the portion on the soft resin portion 21A side is the same as in the first embodiment. The dimensions may be as follows. Further, in the illustrated example, the dimension along the front-rear direction of a portion of the first hard resin portion 25A that defines the groove inner side surface facing the front side of the first mounting groove 17A is set to the soft resin portion 21A of the first hard resin portion 25A. An example is shown in which the dimensions are substantially the same as the dimensions along the front-rear direction of the side part.

Further, the groove bottom portion 26A as a portion forming the groove bottom of the first mounting groove 17A in the first hard resin portion 25A is configured to be a stopper fastening portion, similarly to the first embodiment. The dimension along the up-down direction of the groove bottom portion 26A of the first hard resin portion 25A may be approximately the same as the size of the above-described fastener fastening piece portion 26.
Further, in the present embodiment, the lower surface of the first hard resin portion 25A includes a groove bottom portion 26A of the first hard resin portion 25A, and the lower surface of the first hard resin portion 25A is a flat surface that is in contact with the bottom surface portion 15A of the recess 14A. Further, the surface facing the rear side of the portion defining the groove inner surface facing the front side of the first mounting groove 17A in the first hard resin portion 25A is formed as a flat surface abutting on the side surface portion 16A of the recess 14A. I have.

  Further, in the present embodiment, the first hard resin portion 25A extends from the upper end portion on one side in the thickness direction of the tread plate toward the rear side on the other side in the depth direction of the tread plate, and in the thickness direction of the tread plate main body 10A. An extension piece 27 is provided along the upper surface 11A, which is one surface side. With such a configuration, the step at the boundary between the buffer member 20A and the portion arranged in the recess 14A is more effectively reduced as compared with the case where the extension piece 27 is not provided. be able to. Thereby, it is possible to make it more difficult for the user to feel uncomfortable when stepping on the floor, and it is possible to more effectively suppress damage to the surface decorative sheet 30. Moreover, the edge of the recess 14A of the tread main body 10A on the side surface 16A side can be covered by the extension piece 27, and the edge of the recess 14A of the tread main body 10A can be protected. The area can be increased, and the fixing strength can be improved.

  In this embodiment, the recessed step 11Ab for receiving the extension piece 27 is positioned rearward of the recess 14A such that the upper surface of the extension piece 27 is substantially flush with the upper surface 11A of the tread body 10A. Is provided so as to be connected to The recessed step portion 11Ab is provided so as to be stepped down from the upper surface 11A of the tread plate main body 10A, and is provided in the entire direction along the step width direction of the tread plate main body 10A. In the illustrated example, an example is shown in which the concave step portion 11Ab is provided so as to be continuous with the front side of the second mounting groove 18A. That is, between the second mounting groove 18A and the concave portion 14A, a receiving surface portion 11Ab facing upward, which is a concave step portion, is provided so as to be located below the upper surface 11A of the tread plate main body 10A. It should be noted that the receiving surface portion 11Ab serving as such a concave step portion is provided, and instead of the configuration in which the extending piece portion 27 abuts on the receiving surface portion 11Ab, the extending piece portion 27 abuts on the upper surface 11A of the tread plate main body 10A. It is good also as a structure which contacted.

Further, in the present embodiment, the distal end portion of the extension piece 27 is configured to be a part of the concave step on the front side of both edges of the opening of the second mounting groove 18A. In the illustrated example, the upper surface of the distal end portion of the extension piece portion 27 is formed as an inclined surface that is inclined so as to descend toward the distal end, and a concave step portion is formed by the inclined surface and the side edge of the second mounting groove 18A of the receiving surface portion 11Ab. Is shown.
The size of the extension piece 27 along the up-down direction is appropriately set from the viewpoint of the strength of the part, the step at the boundary part generated when a load is applied, the viewpoint of miniaturization, the viewpoint of achieving compactness, and the like. It may be. The vertical dimension of the extension piece 27 may be, for example, approximately the same as the vertical dimension of the second hard resin portion 28A.
In addition, instead of the mode in which the second mounting groove 18A is provided as described above, a mode in which the surface decorative sheet 30 is stuck in a series so as to straddle the boundary between the extension piece 27 and the tread body 10A. It may be. Even in such a case, since the amount of deformation of the extension piece 27 is smaller than that of the portion arranged in the recess 14A, the damage of the surface decorative sheet 30 at the boundary is more effectively suppressed. can do.

Each of the marking members 32A, 32A attached to each of the mounting grooves 17A, 18A has a top surface 33A, a top surface 33A of the surface decorative sheet 30 attached to the tread plate main body 10A and an upper surface 11A, 21a, 25Aa of the buffer member 20A. It is mounted so that it is slightly lower than the upper surface. That is, the size of the heads 33A, 33A in the vertical direction is smaller than that of the first embodiment. Further, instead of a mode in which the upper surfaces of the flanges 33Aa, 33Aa are inclined surfaces, the distal ends of the flanges 33Aa, 33Aa have an R-plane shape.
Further, the locking pieces 34Aa, 34Aa on both sides in the thickness direction of the engaging projections 34A, 34A of the respective marking members 32A, 32A are locked so as to bite into the inner surfaces of both mounting grooves 17A, 18A. It has a nail shape. In addition, a plurality of (two in the illustrated example) retaining piece portions 34Aa, 34Aa are provided at intervals on the both sides in the thickness direction of each of the engagement protrusions 34A, 34A in the thickness direction.

Further, in the present embodiment, the engagement protrusion 29A of the cushioning member 20A is provided so as to be located on the front side which is one side in the depth direction of the tread plate with respect to the first hard resin portion 25A. With such a configuration, even when there is a gap between the groove bottom of the engagement groove 15Aa and the tip of the engagement protrusion 29A due to a processing error or the like, the deformation of the first hard resin portion 25A is effectively performed. Can be made smaller.
That is, in the present embodiment, the engagement protrusion 29A is provided so as to protrude downward from the lower surface of the second hard resin portion 28A at an intermediate position in the front-rear direction. In the illustrated example, an example is shown in which an engagement protrusion 29A is provided on the lower surface of the rear end side portion of the second hard resin portion 28A. Further, in the present embodiment, both sides in the thickness direction of the engagement protrusion 29A are formed into a flat surface having no retaining piece. Note that a configuration may be adopted in which a chamfered portion or the like is provided at the tip of both sides in the thickness direction of the engagement protrusion 29A.

In the present embodiment, the narrow groove 19 is not provided at the boundary between the second hard resin portion 28A and the front end face 13A of the tread body 10A. In other words, the front end surface 13A of the flat tread body 10A and the front surface 28Aa of the second hard resin portion 28A are substantially flush. Further, the lower surface of the second hard resin portion 28A and the lower surface of the first hard resin portion 25A are substantially in the same plane.
The recess 14A of the tread main body 10A has a shape corresponding to the buffer member 20A described above. That is, the front side portion and the rear side portion of the engagement groove 15Aa on the bottom surface portion 15A are substantially flush with each other. In addition, an aspect in which the receiving recess 16a as described above is not provided in the side surface portion 16A is adopted.

Also in the present embodiment, the engagement protrusion 29A of the cushioning member 20A is fitted into the engagement groove 15Aa of the tread plate body 10A, and the stopper is fixed to the stopper fixing portion (groove bottom portion 26A) so that the cushioning member is fixed. 20A may be attached to the tread main body 10A. As described above, the cushioning member 20A may be attached to the recess 14A of the tread main body 10A by using an adhesive. In this case, the lower surface of the extension piece portion 27, the surface facing the rear side of the first hard resin portion 25A, the lower surface, and the like may be fixed to a portion where they come into contact via an adhesive.
Also, the tread 1A according to the present embodiment has substantially the same effects as the first embodiment.

It should be noted that different configurations of the treads 1 and 1A according to each of the above-described embodiments may be appropriately rearranged or combined.
Further, in each of the above-described embodiments, the example in which the first sign members 32 and 32A and the second sign members 32 and 32A are the same parts is shown, but they may be different. In this case, the mounting grooves 17, 17A, 18, 18A may be appropriately deformed as needed.
In each of the above embodiments, an example is shown in which the first mounting grooves 17, 17A and the first indicating members 32, 32A and the second mounting grooves 18, 18A and the second indicating members 32, 32A are provided. However, one or both of these may not be provided. For example, a mode in which the extending piece 27 is provided without providing the first mounting grooves 17, 17A and the first indicating members 32, 32A as described above may be adopted.
Further, in each of the above embodiments, an example is shown in which the first hard resin portions 25, 25A and the second hard resin portions 28, 28A of the cushioning members 20, 20A are integrally formed so as to be continuous. These may be separated from each other via the soft resin portions 21 and 21A.
Further, in each of the above embodiments, the first hard resin portions 25, 25A and the second hard resin portions 28, 28A are provided on the hard resin portions 24, 24A so as to be located behind and below the soft resin portions 21, 21A. Although an example in which is provided is shown, one or both of them may not be provided. In this case, the configuration may be such that the hard resin portions 24, 24A are embedded in the lower end side, the rear end side, and the like of the soft resin portions 21, 21A.

In each of the above embodiments, the engagement protrusions 29, 29A are provided on the cushioning members 20, 20A so as to protrude downward, and the engagement grooves 15a, 15Aa are formed in the bottom surfaces 15, 15A of the tread plate bodies 10, 10A. Is shown, but the present invention is not limited to such an embodiment. The engagement members 29, 29A may be provided on the cushioning members 20, 20A so as to project toward the rear side, and the engagement grooves may be provided on the side surface portions 16, 16A of the tread plate bodies 10, 10A. In this case, the engagement protrusions 29, 29A may form the groove bottom of the mounting groove, or may form the stopper fastening piece.
In each of the above embodiments, an example is shown in which the surface decorative sheet 30 is adhered so as to cover the surfaces of the cushioning members 20 and 20A and to cover the upper surfaces 11 and 11A and the front end surfaces 13 and 13A of the tread plate bodies 10 and 10A. However, such a surface decorative sheet 30 may not be attached. Various other modifications are possible for the treads 1 and 1A according to the above embodiments.

1,1A Treadboard 10,10A Treadboard body 11,11A Upper surface (one surface in the thickness direction)
13, 13A Front end face (one end face in the depth direction)
14,14A recess 15,15A bottom (inner surface)
15a, 15Aa Engagement groove 16, 16A Side surface (inner surface)
17, 17A First mounting groove (mounting groove)
19 Narrow groove 20, 20A Buffer member 21, 21A Soft resin part 21a Upper surface (surface)
21b Front (front)
24, 24A Hard resin part 25, 25A First hard resin part 25a, 25Aa Upper surface (surface)
27 Extension piece part 29, 29A Engagement projection 30 Surface decorative sheet 31 End part 32, 32A First sign member (mark member)

Claims (9)

A tread provided with a cushioning member in a recess provided at one corner in the thickness direction of the tread plate body and one end surface in the depth direction so as to open toward one side in the thickness direction and one side in the depth direction. hand,
The cushioning member is a soft resin portion disposed to constitute the corner portion of the tread plate, and is disposed so as to be located between the soft resin portion and the inner surface of the recess. The hard hard resin part is configured to be integrally molded,
At the boundary between the one end surface in the depth direction of the tread plate body and the cushioning member, a narrow groove that opens toward one side in the tread plate depth direction is provided,
An engaging groove is provided on an inner surface of the recess of the tread plate main body, while an engaging protrusion fitted into the engaging groove is provided in the hard resin portion. . In claim 1,
A first hard resin portion disposed so as to be located between a side surface portion of the recess of the tread plate main body facing one side in a tread depth direction and the other side of the tread plate depth direction of the soft resin portion; And a portion provided with the engagement protrusions, and is integrally formed so as to be continuous. In claim 2,
The engagement groove is provided so as to open toward one side in the thickness direction of the tread plate on a bottom surface portion facing the one side in the thickness direction of the tread plate of the recess of the tread plate body,
The engagement protrusion of the cushioning member is provided so as to continue to the other side in the thickness direction of the tread plate of the first hard resin portion and to project toward the other side in the thickness direction of the tread plate. Treads. In claim 2 or 3,
A mounting groove is provided between the side surface portion of the recess of the tread plate body and the first hard resin portion so as to open toward one side in the tread plate thickness direction,
A tread plate comprising a marking member attached to the attachment groove. In claim 2 or 3,
The first hard resin portion is provided with a mounting groove so as to open toward one side in the tread plate thickness direction,
A tread plate comprising a marking member attached to the attachment groove. In claim 4 or 5,
A surface decorative sheet is adhered so as to cover the surface of the cushioning member, and to cover one surface in the thickness direction and one end in the depth direction of the tread body.
The tread plate according to claim 1, wherein the marking member is attached to the mounting groove so as to press an end of the facing decorative sheet at both edges of the opening of the mounting groove. In any one of claims 2, 3, and 5,
An extending piece portion is provided so as to extend from one side in the thickness direction of the tread plate in the first hard resin portion toward the other side in the depth direction of the tread plate, and along one surface side in the thickness direction of the tread plate main body. Treads characterized by the fact that: In any one of claims 1 to 7,
The soft resin portion is formed of a soft resin composition having a Shore A hardness of 50 or more and less than 70, and the hard resin portion is formed of a hard resin composition having a Shore A hardness of 70 or more and less than 90, And a difference in Shore A hardness between the soft resin composition and the hard resin composition is 10 or more. In any one of claims 1 to 8 ,
The soft resin portion and the hard resin portion have the same resin main component, and the content of the plasticizer with respect to the resin main component of the soft resin portion is larger than that of the hard resin portion. And treads.

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