Plate material with Anti-skid function and manufacturing device for plate material with Anti-skid function as well as manufacturing method for plate material with Anti-skid function

Abstract

To provide a plate material with an anti-skid function which has a plurality of concave parts having anti-skid functions on a surface of the plate material and whose bending rigidity can be improved.SOLUTION: A plate material with an anti-skid function is a plate-like extruded material 2 formed by continuously extruding a thermoplastic member, where a concave-convex part with an anti-skid pattern is formed on an upper surface part on which a person rides in the extruded material. The extrude material has a nearly channel-shaped cross section which has side wall parts 2b bending in a perpendicular direction from both ends in a width direction thereof. The concave-convex part is constituted of a plurality of convex portions 2d formed with a predetermined interval in the width direction along a longitudinal direction of the extruded material 2 and concave portions 2e formed on top faces of the convex portions 2d crossing the longitudinal direction.SELECTED DRAWING: Figure 2A

Description

Technical Field

[0001] The present invention relates to a plate material with an anti-slip function formed by extrusion molding of an aluminum alloy or the like as a thermoplastic material, an apparatus for manufacturing the plate material with an anti-slip function, and a method for manufacturing the plate material with an anti-slip function.

Background Art

[0002] Patent Document 1 describes a plate material manufactured by extrusion molding of a thermoplastic material such as an aluminum alloy. This plate material is configured to be used for a ladder, a footrest of a step ladder, etc., and by forming a plurality of depressions arranged in the width direction and the longitudinal direction of the tread on the surface (tread surface) of the tread, it is configured to obtain an anti-slip effect for footwear.

[0003] Further, as a method for manufacturing the tread, a metal such as an aluminum alloy is supplied to a die for extrusion molding, the metal is formed into a plate shape with an L-shaped cross section, and then a columnar molding tool having convex portions formed on the outer surface in the extrusion direction of the metal and in a direction intersecting the extrusion direction is pressed against the surface of the metal, so that the shape of the convex portions is transferred to the metal to form depressions serving as an anti-slip function.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The anti-slip function-equipped plate material described in Patent Document 1 has a plurality of depressions formed on the surface of the tread plate. When forming such depressions on the tread plate, when a convex portion is pressed against the flat surface of the metal, the contact area between the convex portion and the surface of the metal increases. Therefore, there is a concern that sufficient stress cannot be applied to form the depression, and the depth of the depression cannot be formed deeply, and there is room for improvement to improve the anti-slip function of the tread plate.

[0006] In view of the above circumstances, the present invention has been made, and an object thereof is to provide an anti-slip function-equipped plate material capable of improving the anti-slip function of the plate material, a manufacturing apparatus for the anti-slip function-equipped plate material, and a manufacturing method for the anti-slip function-equipped plate material.

Means for Solving the Problems

[0007] In order to solve the above problems, the anti-slip function-equipped plate material according to the present invention is a plate-shaped extruded profile formed by continuously extruding a thermoplastic member, and an anti-slip pattern of uneven portions is formed on the upper surface portion on which a person rides in the extruded profile. The anti-slip function-equipped plate material, wherein the extruded profile includes a reinforcing convex portion formed to protrude vertically from the back surface portion opposite to the upper surface portion to increase the bending rigidity of the extruded profile, and the uneven portion includes a plurality of convex strip portions formed along the longitudinal direction of the extruded profile and at a predetermined interval in the width direction, and a concave portion formed on the top surface of the convex strip portion intersecting the longitudinal direction, and is characterized by being configured as such (Claim 1).

[0008] The anti-slip function-equipped plate material configured as described above includes a reinforcing convex portion formed to protrude vertically from the back surface portion opposite to the upper surface portion on which a person rides, and since the convex strip portions are formed in the longitudinal direction, the bending rigidity in the longitudinal direction of the anti-slip function-equipped plate material can be improved. Further, since the concave portion is formed on the top surface of the convex strip portion intersecting the longitudinal direction of the convex strip portion, the depth of the concave portion can be formed deeply, and the anti-slip function can be improved.

[0009] In the present invention, it is preferable that the extruded profile further includes a reinforcing portion that bends from the lower end portion of the reinforcing convex portion toward the width direction of the extruded profile and is parallel to the upper surface portion (Claim 2).

[0010] The anti-slip function-equipped plate material configured as described above can further improve the bending rigidity by providing a reinforcing portion at the lower end portion of the reinforcing convex portion in addition to the reinforcing convex portion.

[0011] In the present invention, it is preferable that the depth of the recess is formed shallower than the height of the rib portion (Claim 3).

[0012] When the anti-slip function-equipped plate material configured as described above is used outdoors on a rainy day, water dripping onto the anti-slip function-equipped plate material or adhering to the sole of a shoe flows into the recess. Further, the water flows from the recess to a relatively depressed position between the rib portions in the width direction of the plate material, and the water that has flowed to the depressed position between the recesses in the width direction of the plate material flows in the longitudinal direction of the plate material. Therefore, drainage can be improved, and the presence of water between the sole of the shoe and the top of the rib portion can be suppressed. Thus, the anti-slip function of the anti-slip function-equipped plate material can be improved.

[0013] In the present invention, it is preferable that the extruded profile is formed in a substantially channel-shaped cross-section having side wall portions bent vertically from both ends in the width direction, and the reinforcing convex portion includes the side wall portions (Claim 4).

[0014] The anti-slip function-equipped plate material configured as described above is formed in a substantially channel-shaped cross-section and has rib portions formed in the longitudinal direction, so that the bending rigidity in the longitudinal direction of the anti-slip function-equipped plate material can be improved. Further, since the recesses are formed on the top surface of the rib portions intersecting the longitudinal direction of the rib portions, the depth of the recesses can be increased, and the anti-slip function can be improved. Furthermore, it can be formed by extrusion molding without requiring secondary processing, and the manufacturing man-hours of the anti-slip function-equipped plate material can be reduced.

[0015] In the present invention, it is preferable that the recesses are a plurality of recesses having a predetermined pattern shape repeatedly formed in the longitudinal direction of the extruded profile (Claim 5). The plurality of recesses having the predetermined pattern shape may be X-shaped recesses intersecting at the top surface of the rib portion (Claim 6), may be recesses having a rectangular cross-sectional shape (Claim 7), or may be recesses having a V-shaped cross-sectional shape (Claim 8).

[0016] The anti-slip function-equipped plate material configured as described above can pattern a member for transferring the recesses to the rib portion during extrusion molding to form continuous recesses in the rib portion, thereby improving the manufacturability of the anti-slip function-equipped plate material.

[0017] Further, a manufacturing apparatus for an anti-slip function-equipped plate material according to the present invention is a manufacturing apparatus for an anti-slip function-equipped plate material that forms uneven portions on the surface of a plate material formed of a thermoplastic member continuously extruded from a material supply side, and includes an upper die for introducing the thermoplastic member, a lower die for supporting the upper die, and a forming tool that rotates as the thermoplastic member moves to form recesses on the surface of the thermoplastic member. The upper die includes a first through hole that forms the thermoplastic member into a flat rectangular cross-sectional shape by the flow of the thermoplastic member, a second through hole that protrudes from one long side of the first through hole to form a reinforcing convex portion that increases the bending rigidity of the thermoplastic member, and a third through hole that protrudes from the inner side in the length direction of the long side of the first through hole to the other long side of the first through hole and is formed with a rib portion along the flow direction of the thermoplastic member with a predetermined interval therebetween. The forming tool is characterized by having a forming rib portion that forms the recesses in a direction intersecting the rib portion by pressing the top surface of the rib portion (Claim 9).

[0018] The manufacturing apparatus for a sheet material with an anti-slip function configured as described above can form a thermoplastic member by a bearing portion into a shape having a rib portion along the flow direction of the thermoplastic member and a reinforcing rib protruding opposite to the rib portion, and can form a recess in a direction intersecting the rib portion on the top surface of the rib portion by a forming tool. Therefore, after forming an extruded profile, a recess with a desired pattern can be continuously formed without performing secondary processing such as forming the recess. As a result, the manufacturing man-hours for the sheet material with an anti-slip function can be reduced.

[0019] In this invention, it is preferable that the forming tool is rotatably provided below the bearing portion in the upper die, and further includes a position adjusting mechanism for adjusting the position of the forming tool so as to adjust the distance between the position where the thermoplastic member advances and the forming tool (Claim 10).

[0020] The manufacturing apparatus for a sheet material with an anti-slip function configured as described above can appropriately adjust the pressing amount of the forming tool against the thermoplastic member. Therefore, the depth of the recess formed in the sheet material with an anti-slip function can be adjusted to a desired depth.

[0021] In this invention, it is preferable that the position adjusting mechanism is configured to adjust the position of the forming tool to a position where the depth of the recess is shallower than the height of the rib portion (Claim 11).

[0022] The manufacturing apparatus for a sheet material with an anti-slip function configured as described above forms the depth of the recess shallower than the height of the rib portion. Therefore, the sheet material with an anti-slip function formed by the manufacturing apparatus can make the water flowing into the recess flow to a relatively depressed position between the rib portions and further flow in the longitudinal direction of the sheet material, thereby improving the drainage. That is, a sheet material with an anti-slip function having an excellent anti-slip function can be formed.

[0023] In the present invention, the second through hole is formed to communicate with both ends in the longitudinal direction of the first through hole, and it is preferable that the bearing portion is configured to form the thermoplastic member into a substantially channel-shaped cross section having the rib portion along the advancing direction of the thermoplastic member (Claim 12).

[0024] The manufacturing apparatus for the anti-slip function-equipped plate material configured as described above can form the thermoplastic member into a substantially channel-shaped cross section having a rib portion along the advancing direction of the thermoplastic member by the bearing portion, and can form a recess in a direction intersecting the rib portion on the top surface of the rib portion by the forming tool. Therefore, after forming the extruded profile, the recess of the desired pattern can be continuously formed without performing secondary processing such as forming the recess. As a result, the manufacturing man-hours of the anti-slip function-equipped plate material can be reduced.

[0025] Furthermore, the manufacturing method of the anti-slip function-equipped plate material according to the present invention is a manufacturing method of an anti-slip function-equipped plate material that continuously extrudes a thermoplastic member from the material supply side and forms uneven portions on the surface of the thermoplastic member as the thermoplastic member advances. The method includes passing the thermoplastic member through a bearing portion formed in an upper die into which the thermoplastic member is introduced, thereby forming the outer shape of the thermoplastic member into a desired shape having a rib portion along the advancing direction of the thermoplastic member and a reinforcing rib protruding on the side opposite to the rib portion, and then pressing the top surface of the rib portion by a forming tool having a predetermined formed rib portion to form a recess in a direction intersecting the rib portion (Claim 13).

[0026] The manufacturing method of the anti-slip functional plate material configured as described above forms the thermoplastic member into a desired shape having a convex strip portion and a reinforcing convex portion protruding on the side opposite to the convex strip portion by means of a bearing portion, and then forms a concave portion by pressing the top surface of the convex strip portion with a forming tool having a predetermined formed convex strip portion. Therefore, after forming the extruded material, the concave portion of the desired pattern can be continuously formed on the convex strip portion without performing secondary processing or the like for forming the concave portion. As a result, the manufacturing man-hours of the anti-slip functional plate material can be reduced.

[0027] In this invention, it is preferable that after adjusting the distance between the position where the thermoplastic member advances and the forming tool by a position adjusting mechanism for adjusting the position of the forming tool, the thermoplastic member is continuously extruded to form the uneven portions on the surface of the thermoplastic member (Claim 14).

[0028] The manufacturing method of the anti-slip functional plate material configured as described above adjusts the distance between the position where the thermoplastic member advances and the forming tool by a position adjusting mechanism, and then continuously extrudes the thermoplastic member to form uneven portions on the surface of the thermoplastic member. That is, by adjusting the amount of penetration of the forming tool into the thermoplastic member, only the depth of the concave portion can be appropriately adjusted. Therefore, it is possible to suppress the top of the forming tool from contacting portions other than the convex strip portion such as the upper surface of the thermoplastic member. In other words, the contact area between the top of the forming tool and the thermoplastic member can be reduced to an appropriate area. Therefore, the stress for forming the concave portion in the convex strip portion of the thermoplastic member can be improved. As a result, the concave portion can be formed deeper or more clearly, and the anti-slip function of the anti-slip functional plate material can be improved. Alternatively, by forming the concave portion only in the convex strip portion, it is possible to suppress a decrease in the plate thickness of the upper surface where the convex strip portion is formed, and to suppress a decrease in the bending rigidity of the anti-slip functional plate material.

Effect of the Invention

[0029] According to the plate material with an anti-slip function according to the present invention, since it has a rib portion along the longitudinal direction and a concave portion in a direction intersecting the rib portion formed on the top surface of the rib portion, the anti-slip function can be improved. In particular, by forming the depth of the concave portion shallower than the height of the rib portion, the drainage of the plate material with an anti-slip function can be improved, so that the anti-slip function can be further improved. Further, since the reinforcing convex portion is formed on the plate material and the convex rib portion is formed on the upper surface, the bending rigidity of the plate material with an anti-slip function can be improved. In other words, the plate thickness of the plate material with an anti-slip function can be reduced.

[0030] Further, according to the manufacturing apparatus for a plate material with an anti-slip function according to the present invention, by means of the bearing portion, a thermoplastic member is formed into a plate shape having a rib portion along the advancing direction of the thermoplastic member and a reinforcing convex portion protruding on the side opposite to the rib portion, and by means of the molding tool, a concave portion in a direction intersecting the rib portion is molded on the top surface of the rib portion, so that the pattern of the concave portion having an anti-slip function can be stably and deeply molded. Therefore, the anti-slip function of the plate material with an anti-slip function manufactured by this manufacturing apparatus can be improved.

[0031] Furthermore, according to the manufacturing method for a plate material with an anti-slip function according to the present invention, by passing a thermoplastic member through the bearing portion, the outer shape of the thermoplastic member is formed into a desired shape having a rib portion along the advancing direction of the thermoplastic member and a reinforcing convex portion protruding on the side opposite to the rib portion, and then, by pressing the top surface of the rib portion with a molding tool having a predetermined molding rib portion, a concave portion in a direction intersecting the rib portion is molded. Therefore, after molding the extruded material, the concave portion having a desired pattern can be continuously molded on the rib portion without performing secondary processing or the like for molding the concave portion. As a result, the manufacturability of the plate material with an anti-slip function can be improved.

Brief Description of the Drawings

[0032]

Figure 1

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Embodiments for Carrying Out the Invention

[0033] FIG. 1 shows a perspective view of a step 1 using a plate material with an anti-slip function in an embodiment of the present invention. This step 1 is composed of two upper plates 2, two connectors 3, four first connecting fittings 4, four support legs 5, two first reinforcing shaft members 6, two second reinforcing shaft members 7, and four second connecting fittings 8.

[0034] The upper plate 2 corresponds to a plate member with an anti-slip function in the embodiment of the present invention, and is composed of an extruded profile in a plate shape formed by continuously extruding an aluminum alloy, which is a thermoplastic member. Fig. 2A(a) shows a perspective view for explaining the configuration of the upper plate 2, and Fig. 2B shows a cross-sectional view taken along the line I-I in Fig. 2A(a). The upper plate 2 is configured such that a person can ride on its upper surface. Therefore, in order to improve the bending rigidity of the upper plate 2, the cross-section of the upper plate 2 shown in Fig. 2A(a) and Fig. 2B is formed in a channel shape in the direction perpendicular to its longitudinal direction. Specifically, it includes a top plate portion 2a having the upper surface of the upper plate 2, and side wall portions 2b formed by bending vertically from both sides in the width direction of the top plate portion 2a. In the example shown in Fig. 2A(a) and Fig. 2B, further, a reinforcing portion 2c is provided, which is formed by bending vertically from the lower end of the side wall portion 2b and is parallel and opposed to the top plate portion 2a. That is, by forming the side wall portions 2b, it is configured to improve the bending rigidity against the load that deflects the upper plate 2 in the longitudinal direction, and the side wall portions 2b are configured to function as the "reinforcing convex portions" in the embodiment of the present invention. Also, in the example shown here, a reinforcing portion 2c is formed to further increase the section modulus of the upper plate 2 and improve the bending strength in the longitudinal direction of the upper plate 2.

[0035] On the top plate portion 2a, anti-slip pattern uneven portions are formed to prevent a person from slipping when riding. Specifically, a plurality of convex strip portions 2d are formed along its longitudinal direction and at a predetermined interval in the width direction. On the top surface of the convex strip portion 2d, a plurality of concave portions 2e are formed at a predetermined interval in the longitudinal direction of the convex strip portion 2d (that is, the longitudinal direction of the top plate portion 2a) and intersecting the longitudinal direction. That is, the concave portions 2e in a predetermined pattern shape are repeatedly formed on the top surface of the convex strip portion 2d. Also, the concave portion 2e is formed shallower than the height of the convex strip portion 2d. Here, Fig. 2A and Fig. 2B show an example in which the concave portion 2e shown in Fig. 4 is formed on the convex strip portion 2d. Note that through holes 2f are formed at both ends in the longitudinal direction of the side wall portions 2b, and rivets 10 for attaching a first connecting fitting 4 described later are inserted into the through holes 2f.

[0036] Figures 3, 4, and 5 show an example of the recess 2e. The recess 2e shown in Fig. 3 is inclined with respect to the longitudinal direction of the rib portion 2d and intersects at the top surface of the rib portion 2d with each other, and is formed by two grooves having a V-shaped cross section. That is, the recess 2e shown in Fig. 3 is formed in an X shape. In addition, Fig. 3(a) shows a perspective view of the upper plate 2 in which the recess 2e is formed by two intersecting grooves, Fig. 3(b) shows an enlarged perspective view of part B in Fig. 3(a), Fig. 3(c) shows a front view, and Fig. 3(d) shows an enlarged cross-sectional view taken along line II-II of Fig. 3(c).

[0037] Further, the recess 2e shown in Fig. 4 is formed by a groove having a rectangular cross section that intersects perpendicularly to the longitudinal direction of the rib portion 2d and has a predetermined length in the longitudinal direction thereof. Furthermore, the recess 2e shown in Fig. 5 is formed by a groove having a V-shaped cross section that intersects perpendicularly to the longitudinal direction of the rib portion 2d. In addition, Fig. 4(a) shows a perspective view of the upper plate 2 in which the recess 2e is formed by a groove having a rectangular cross section, Fig. 4(b) shows a front view thereof, and Fig. 4(c) shows an enlarged cross-sectional view taken along line III-III of Fig. 4(b). Also, Fig. 5(a) shows a perspective view of the upper plate 2 in which the recess 2e is formed by a groove having a V-shaped cross section, Fig. 5(b) shows an enlarged perspective view of part C in Fig. 5(a), Fig. 5(c) shows a front view, and Fig. 5(d) shows an enlarged cross-sectional view taken along line IV-IV of Fig. 5(c).

[0038] Fig. 6 shows a state in which two upper plates 2 are connected by a connector 3. Fig. 6(a) shows a perspective view thereof, and Fig. 6(b) shows a side view thereof. The connector 3 shown in Fig. 6 is composed of an extruded shape formed by extruding an aluminum alloy, which is a thermoplastic member. This connector 3 is configured such that its cross-sectional shape is formed in a channel shape and connects the two upper plates 2 by fitting to the ends of the two upper plates 2.

[0039] Therefore, the length of the connector 3 is formed to be the same as the total width when the two upper plates 2 are arranged side by side in the width direction. Also, the width of the opening into which the upper plate 2 fits is formed to be the same as the length from the top surface of the rib portion 2d to the bottom surface of the reinforcing portion 2c on the upper plate 2. That is, the connector 3 has a side wall portion 3a facing the end surface of the upper plate 2, an upper wall portion 3b facing the top surface of the rib portion 2d on the upper plate 2, and a lower wall portion 3c facing the bottom surface of the reinforcing portion 2c on the upper plate 2. Through holes 3d are formed at both ends of the side wall portion 3a of the connector 3, and a rivet 10 for attaching a first connecting fitting 4 described later is inserted into the through holes 3d. Note that the upper plates 2 may only be arranged side by side in the width direction so that the opposing side wall portions 2b abut against each other, or the side wall portions 2b may be connected by rivets, bolts, welding, or the like.

[0040] The above-described connector 3 is formed with a large section modulus in the width direction of the upper plate 2. Since both ends of the upper plate 2 are fitted and supported by the connector 3, when a load acts from above the upper plate 2, the bending rigidity in the width direction of the upper plate 2 can be improved.

[0041] FIG. 7 is a perspective view showing a state in which the support leg 5, the first reinforcing shaft member 6, and the second reinforcing shaft member 7 are unitized by a second connecting fitting 8. As shown in FIG. 7, the support leg 5 is an extruded member having a channel-shaped cross-sectional shape, and its opening side is arranged to face each other in the width direction of the upper plate 2. And at each side wall portion 5a of the support leg 5 that faces each other in the longitudinal direction of the upper plate 2, the end of the first reinforcing shaft member 6, which is an extruded member having a channel-shaped cross-sectional shape, is in contact.

[0042] And on the side wall portion 5b of the support leg 5 facing the outside in the width direction of the tread 1 and the side wall portion 6a of the first reinforcing shaft member 6, a plate-shaped second connecting fitting 8 formed in an L-shape is fixed by a rivet 10. That is, the support leg 5 and the first reinforcing shaft member 6 are connected via the second connecting fitting 8.

[0043] Further, the second reinforcing shaft member 7 is an extruded shape material having a hollow rectangular cross-sectional shape, and both ends thereof are fitted to the support legs 5. Then, rivets 10 are attached so as to penetrate the side wall portions 5a and 5c of the support legs 5 that face each other and the second reinforcing shaft member 7, and the second reinforcing shaft member 7 is fixed to the support legs 5. Note that two through holes 5d are formed side by side in the length direction of the support legs 5 at the upper ends of the side wall portions 5b and 5c of the support legs 5, respectively.

[0044] FIG. 8 shows a perspective view for explaining the configuration of the first connecting fitting 4. As shown in FIG. 8, the first connecting fitting 4 includes a first wall portion 4a having a predetermined length in the height direction of the step 1, a second wall portion 4b that is continuous with one end in the width direction of the first wall portion 4a and is formed perpendicular to the first wall portion 4a, and a square upper end portion 4c that is horizontally continuous with the upper ends of the first wall portion 4a and the second wall portion 4b.

[0045] That is, the first wall portion 4a is in surface contact with the side wall portion 5c of the support leg 5 and the side wall portion 3a of the connecting fitting 3, the second wall portion 4b is in surface contact with the side wall portion 5b of the support leg 5 and the side wall portion 2b of the upper plate 2, and the upper end portion 4c is configured to be in surface contact with the upper wall portion 3b of the connecting fitting 3. Further, through holes 4d for inserting the rivets 10 are formed in the first wall portion 4a at positions corresponding to the through holes 5d formed in the support legs 5 and at positions corresponding to the through holes 3d formed in the connecting fitting 3, and through holes 4d for inserting the rivets 10 are formed in the second wall portion 4b at positions corresponding to the through holes 5d formed in the support legs 5 and at positions corresponding to the through holes 2f formed in the upper plate 2.

[0046] Then, by inserting a rivet 10 into the through-hole 5d formed in the support leg 5, the through-hole 3d formed in the connector 3, the through-hole 2f formed in the upper plate 2, and the through-hole 4d formed in the first connecting fitting 4, the first connecting fitting 4 is integrated with the upper plate 2, the connector 3, and the support leg 5. That is, with the upper unit assembled by assembling the upper plate 2 and the connector 3 placed on the lower unit assembled with the support leg 5, the first reinforcing shaft member 6, and the second reinforcing shaft member 7, the first connecting fitting 4 is attached, whereby the upper unit and the lower unit are integrated to form the step 1.

[0047] As described above, by forming the rib portion 2d on the upper plate 2 and forming the concave portion 2e intersecting the longitudinal direction of the rib portion 2d on the top surface thereof, unevenness in the longitudinal and width directions is formed on the upper surface of the step 1 on which a person rides. Therefore, the anti-slip function when a person rides on the step 1 can be improved. Further, by forming the upper plate 2 in a sectional channel shape and further forming the rib portion 2d on the top plate portion 2a, the section modulus determined by the sectional shape perpendicular to the longitudinal direction in the upper plate 2 can be improved, and the bending rigidity of the upper plate 2 can be improved. Therefore, the plate thickness of the upper plate 2 for satisfying the load-bearing capacity required for the step 1 can be reduced, and thus, the weight of the step 1 can be reduced and the portability can be improved.

[0048] Further, by forming a recess 2e that is shallower than the height on the rib portion 2d, for example, when using the step 1 outdoors on a rainy day, water dripping onto the step 1 or adhering to the sole of a shoe flows into the recess 2e as shown by the dashed line in Fig. 2A(b). Further, the water flows from the recess 2e to a relatively depressed position between the recesses 2e in the width direction of the upper plate 2, and the water flowing into the depressed position flows in the longitudinal direction of the upper plate 2. Therefore, it is possible to improve the drainage. As a result, it is possible to suppress water from intervening between the sole of a shoe and the top of the rib portion 2d, and it is possible to improve the anti-slip function of the step 1. In other words, a relatively depressed position between the recesses 2e in the width direction of the upper plate 2 can function as a drainage channel for discharging the water flowing into the recess 2e from the upper plate 2. Further, by forming the recesses 2e in a predetermined pattern shape in the longitudinal direction of the rib portion 2d, a member for transferring the recesses 2e to the rib portion 2d during extrusion molding can be patterned, and the continuous recesses 2e can be formed in the rib portion 2d, thereby improving the manufacturability of the upper plate 2.

[0049] Note that the extruded material in the embodiment of the present invention only needs to be provided with a reinforcing convex portion for increasing the bending rigidity. Therefore, it is not limited to the one formed in a cross-sectional channel shape like the upper plate 2 described above. Specifically, as shown in the upper plate 2A in Fig. 3A, it may be formed in an L-shaped cross-section having only one side wall portion 2b that functions as the "reinforcing convex portion" in the embodiment of the present invention. As shown in the upper plate 2B in Fig. 3B, the rib R that functions as the "reinforcing convex portion" in the embodiment of the present invention may be formed along the longitudinal direction in the central portion in the width direction. As shown in the upper plate 2C in Fig. 3C, it may be formed in a rectangular hollow shape in cross-section having two side wall portions 2b that function as the "reinforcing convex portion" in the embodiment of the present invention.

[0050] Here, in the examples shown in FIGS. 3A, 3B, and 3C, an example is shown in which an X-shaped recess 2e as an anti-slip pattern is formed in the rib portion 2d. Further, as shown by the imaginary line in FIG. 3C, ribs R may be further formed along the longitudinal direction at the central portion in the width direction of the hollow portion. Furthermore, even when the upper plates 2A, 2B, and 2C are configured as shown in FIGS. 3A, 3B, and 3C, a plurality of them may be arranged side by side in the width direction and integrated by the connecting tool 3, or adjacent extruded members may be connected by rivets, bolts, welding, or the like.

[0051] Next, an example of a manufacturing apparatus for a plate material with an anti-slip function in an embodiment of the present invention will be described. The manufacturing apparatus for a plate material with an anti-slip function in an embodiment of the present invention is constituted by an extrusion die 11 that forms a desired shape by pressing a metal M such as an aluminum alloy, which is a thermoplastic member, by a ram, a stem, or the like (not shown). That is, as the metal M is pressed and progresses, the extrusion die 11 is configured to form, for example, a top plate portion 2a, side wall portions 2b on both sides in the width direction thereof, and a rib portion 2d as shown in FIG. 2A, and to form a recess 2e on the top surface of the rib portion 2d.

[0052] FIGS. 9 and 10 show a cross-sectional view of an example of the use state of the extrusion die 11 for forming the upper plate 2 shown in FIG. 2A. The extrusion die 11 includes an upper die 13 that introduces the metal M pressed from the container 12, a lower die 14 that supports the upper die 13, and a forming tool 15 that rotates as the metal M moves and forms a recess 2e on the surface of the metal M. The upper die 13 and the lower die 14 are connected by, for example, a connecting bolt (not shown) inserted from the back surface of the lower die 14 in a state where a recess 13a formed in one side portion of the upper die 13 and a convex portion 14a formed in one side portion of the lower die 14 are fitted together.

[0053] As shown in FIG. 9, the container 12 is placed on the upper surface of the upper die 13, accommodates the metal M, and can keep the temperature of the metal M at 400 to 500°C, and is configured to supply the material to the upper die 13.

[0054] As shown in FIGS. 9 and 10, the upper die 13 has a slightly recessed central portion for placing the container 12, and a metal introduction recess 13b is formed at the center of the recessed portion. At the bottom of the metal introduction recess 13b, a bearing portion 13c for forming the metal M into the shape of a plate-like member (desired shape) is formed.

[0055] FIG. 11(a) shows a plan view for explaining the shape of the bearing portion 13c, and FIG. 11(b) shows an enlarged view of portion D in FIG. 11(a). As shown in FIGS. 11(a) and 11(b), a channel-shaped recess 13e is formed on the bottom surface of the metal introduction recess 13b, and a bearing portion 13c for forming the blank of the upper plate 2 is formed in the recess 13e. That is, the bearing portion 13c is composed of a through hole 16a corresponding to the top plate portion 2a in FIG. 2A(a), a through hole 16b corresponding to the side wall portion 2b, a through hole 16c corresponding to the rib portion 2d, and a through hole 16d corresponding to the reinforcing portion 2c. Specifically, the bearing portion 13c has a first through hole 16a having a predetermined length in the width direction through which the metal M passes and forming the metal M into a flat rectangular cross-section, a second through hole 16b connected to both ends of the first through hole 16a and in a direction perpendicular to the length direction of the first through hole 16a, that is, formed protruding from one long side of the first through hole 16a, a third through hole 16c formed protruding from the inner side in the length direction of the long side of the first through hole 16a in a direction perpendicular to the first through hole 16a, that is, on the other long side of the first through hole 16a, and a fourth through hole 16d connected to the end of the second through hole 16b and perpendicular to the second through hole 16b and parallel to the first through hole 16a.

[0056] Further, as shown in FIG. 12, an upper guide portion 17 continuous with the bearing portion 13c is formed below the bearing portion 13c. A space 18 for arranging a molding tool 15 to be described later is provided on one side portion constituting the upper guide portion 17. A relief portion 17a is formed on the side of the upper guide portion 17 facing the space 18.

[0057] Further, on the side surface of the lower side of the bearing portion 13c, on the side surface located above the portion where the molding tool 15 is provided, a protruding portion 19 protruding toward the downstream side is provided. This protruding portion 19 is formed along a part of the outer periphery on the upper side of the molding tool 15 and so as to cover a part of the outer periphery. The surface of this protruding portion 19 facing the metal M is formed so as to have a predetermined gap from the metal M, and this portion is configured to function as the upper guide portion 17.

[0058] The space 18 for arranging the molding tool 15 is formed to have a substantially rectangular cross section. On both sides along the length direction of the space 18, as shown in FIG. 13, mounting member installation holes 21 for installing the mounting members 20 of the molding tool 15 are respectively formed. Note that FIG. 13 shows one of the mounting member installation holes 21. This mounting member installation hole 21 is provided along the longitudinal direction of the space 18, has a rectangular shape with a predetermined width, and is formed to a predetermined depth. Then, the mounting member 20 is inserted into the mounting member installation hole 21.

[0059] Also, as shown in FIG. 13, at positions on the outer peripheral surface of the upper die 13 on the extension lines of the respective mounting member installation holes 21, through holes 22 communicating with the mounting member installation holes 21 are formed. The inner diameter of the through hole 22 on the side of the mounting member installation hole 21 is formed smaller than the inner diameter on the outer peripheral side of the upper die 13, and an internal thread is formed in the portion where the inner diameter is small. A positioning bolt 23 constituting the position adjustment mechanism of the molding tool 15 is screwed into this internal thread. Two of these internal threads are formed so as to press two positions, the upper side and the lower side, of the side surface of the mounting member 20.

[0060] On the lower die 14, as shown in FIGS. 9 and 10, a lower guide portion 24 for guiding the metal M is formed. This lower guide portion 24 is formed to have an opening area larger than the opening area of the lower end side of the upper guide portion 17 and is formed along the axial direction of the lower die 14.

[0061] The forming tool 15 is formed in a columnar shape and is configured to form a recess 2e that is continuous in the longitudinal direction on the surface of the metal M, more specifically, on the top surface of the portion corresponding to the rib portion 2d. FIG. 14(a) shows the forming tool 15 for forming the recess 2e shown in FIG. 3. On the outer peripheral surface of the forming tool 15, an X-shaped forming rib portion 25a that is continuous in the rotational direction and the longitudinal direction is formed. The cross-sectional shape of this forming rib portion 25a is formed in a triangular shape. Further, FIG. 14(b) shows the forming tool 15 for forming the recess 2e shown in FIG. 4. On the outer peripheral surface of the forming tool 15, a plurality of forming rib portions 25b are formed along the longitudinal direction thereof and at predetermined intervals in the rotational direction. The cross-sectional shape of this forming rib portion 25b is formed in a rectangular shape. Furthermore, FIG. 14(c) shows the forming tool 15 for forming the recess 2e shown in FIG. 5. On the outer peripheral surface of the forming tool 15, a plurality of forming rib portions 25c are formed along the longitudinal direction thereof and at predetermined intervals in the rotational direction. The cross-sectional shape of this forming rib portion 25c is formed in a triangular shape.

[0062] By forming the forming tool 15 and the relief portion 17a as described above, the metal M, which is the blank material of the upper plate 2 formed by the bearing portion 13c, travels between the forming tool 15 and the relief portion 17a, and is sandwiched between the forming tool 15 and the relief portion 17a to form the recess 2e in the rib portion 2d. When the metal M further advances, the forming tool 15 rotates (revolves) by the load applied to the moving metal M. Therefore, in the advancing direction of the metal M, the portion on the trailing side of the portion where the recess 2e is formed is sandwiched between the forming rib portion 25a (25b, 25c) that follows the forming rib portion 25a (25b, 25c) that formed the recess 2e earlier in the rotational direction of the forming tool 15 and the relief portion 17a, and the recess 2e is formed in the rib portion 2d of the metal M. As the forming tool 15 rotates as the metal M advances in this way, in the rib portion 2d of the metal M, the recess 2e that intersects the longitudinal direction of the rib portion 2d is continuously formed at predetermined intervals in the longitudinal direction of the rib portion 2d. That is, based on the interval of the recesses 2e formed in the rib portion 2d, the interval of the forming rib portions 25a (25b, 25c) in the rotational direction of the forming tool 15 is determined.

[0063] Note that the molding tool 15 forms the concave portion 2e only on the rib portion 2d formed on the metal M. Therefore, based on the height of the rib portion 2d formed on the metal M and the depth of the concave portion 2e formed on the rib portion 2d, the protruding height of the molding rib portion 25a (25b, 25c) of the molding tool 15, the overlap amount between the molding tool 15 and the rib portion 2d of the metal M, etc. are determined.

[0064] As described above, the molding tool 15 is disposed at a position facing the relief portion 17a. Further, as shown in FIG. 15, a bearing 26 is fitted to the attachment member 20, and a shaft portion 27 for supporting the molding tool 15 is fitted to the bearing 26. As shown in FIG. 13, this attachment member 20 is inserted into the attachment member installation hole 21 and slidably fitted to the metal M side. Note that, as shown in FIG. 12, the molding tool 15 and the shaft portion 27 are connected by a key 28.

[0065] Next, the structure of the position adjustment mechanism will be described with reference to FIG. 13. The position adjustment mechanism is composed of a position adjustment bolt 23 that abuts against one end portion in the length direction of the attachment member 20, and an adjustment spacer 29 that is detachably provided in the attachment member installation hole 21.

[0066] This position adjustment bolt 23 is configured such that the tip of each position adjustment bolt 23 abuts against one end portion in the length direction of the attachment member 20 by screwing into the respective female threads formed from the outer peripheral side of the upper die 13 toward the side surface of the attachment member 20.

[0067] For example, as shown in Fig. 13(a), when the positioning bolt 23 is screwed into the female thread, the mounting member 20 slides in the arrow Y direction within the mounting member installation hole 21. As a result, the amount by which the top of the molding tool 15 bites into a predetermined surface of the metal M, which is a thermoplastic member, can be adjusted, that is, the distance between the molding tool 15 and the surface can be adjusted. In Fig. 13(a), the state where the positioning bolt 23 is screwed in to the maximum extent is shown. At this time, the side surface portion on the other side of the mounting member 20 abuts against the end portion of the mounting member installation hole 21. Also, a gap L of a predetermined dimension exists between the side surface portion on one side of the mounting member 20 and the side surface portion on one side of the mounting member installation hole 21.

[0068] Fig. 13(b) shows an adjustment method for reducing the amount by which the top of the molding tool 15 bites into the surface of the metal M, which is a thermoplastic member. In this case, when the positioning bolt 23 is rotated in the reverse direction, the mounting member 20 becomes slidable within the mounting member installation hole 21. Therefore, first, the positioning bolt 23 is rotated in the reverse direction until the gap L of the above-mentioned predetermined dimension disappears.

[0069] Next, grasp the molding tool 15 by hand and pull it toward the positioning bolt 23 side. Then, insert the adjustment spacer 29 into the gap L1 of the dimension of the side surface on the other side so that the set biting amount of the top of the molding tool 15 into the metal M is achieved, and screw the positioning bolt 23 until it abuts against the side surface of the mounting member 20. At this time, the combined dimension of the gap L1 between the mounting member 20 and the side surface of the mounting member installation hole 21 and the gap L2 between the mounting member 20 and the side surface on the other side of the mounting member installation hole 21 is the same as the gap L (=L1 + L2) in Fig. 13(a) above.

[0070] Note that it is sufficient to operate only one of the positioning bolts 23, or only one positioning bolt 23 may be provided.

[0071] As shown in Fig. 15, the adjustment spacer 29 is formed of a plate finished to a predetermined thickness dimension, and a plurality of types of plates with different thicknesses are prepared in advance so that the amount of penetration of the adjustment spacer 29 into the metal M at the top of the molding tool 15 can be adjusted. This adjustment spacer 29 is formed to have a length approximately the same as the thickness of the attachment member 20.

[0072] Also, as shown in Fig. 15, gripping portions 30 are formed at both ends in the width direction at the upper end portion of the adjustment spacer 29. These gripping portions 30 are formed for the purpose of being sandwiched by a predetermined clamping tool (jig) when inserting the adjustment spacer 29 into the attachment member installation hole 21. Note that it is preferable for the position adjustment mechanism to adjust the position of the molding tool 15 to a position where the depth of the concave portion 2e is shallower than the height of the convex rib portion 2d.

[0073] By configuring the extrusion die 11 as described above, the metal M can be formed into a channel-shaped cross-section by the bearing portion 13c, and the convex rib portion 2d along the traveling direction of the metal M can be formed on its surface. Then, while sandwiching the metal M with the convex rib portion 2d formed on its surface between the molding tool 15 having the molding convex rib portions 25a (25b, 25c) intersecting the traveling direction of the metal M and the relief portion 17a, as the metal M travels, the concave portion 2e in the direction intersecting the convex rib portion 2d can be formed on the convex rib portion 2d. That is, after forming the extruded shape material, the concave portion 2e of the desired pattern can be continuously formed without performing secondary processing or the like for forming the concave portion 2e. As a result, the manufacturing man-hours of the upper plate 2 can be reduced, and thus the costs of a step, a stool, or a ladder using the upper plate 2 can be reduced.

[0074] Also, by forming through holes 16a, 16b, 16c, 16d that are the same as the outer shape of the upper plate 2 in the bearing portion 13c, the metal M can be passed only through the bearing portion 13c, and it can be formed into a substantially channel-shaped cross section, and a rib portion 2d along the longitudinal direction can be formed on the top plate portion 2a. Therefore, an increase in the size of the manufacturing apparatus can be suppressed. Further, since the above-described forming tool 15 is rotatably supported by a position adjusting mechanism configured to be able to adjust the amount of penetration into the metal M, the depth of the recessed portion 2e formed in the rib portion 2d can be appropriately adjusted. In other words, the recessed portion 2e can be formed only in the rib portion 2d. Therefore, by reducing the contact area between the top of the forming tool 15 and the metal M, the stress for forming the recessed portion 2e in the metal M can be improved. As a result, the recessed portion 2e can be formed deeply or clearly, and the anti-slip function of the upper plate 2 can be improved. Alternatively, by forming the recessed portion 2e only in the rib portion 2d, a decrease in the plate thickness of the top plate portion 2a can be suppressed, and a decrease in the bending rigidity of the upper plate 2 manufactured by the extrusion die 11 can be suppressed.

[0075] Furthermore, after forming the rib portion 2d on the metal M, by pressing the forming tool 15 only against the rib portion 2d to form the recessed portion 2e, as shown in FIGS. 14(b) and 14(c), the forming tool 15 may be formed with forming rib portions 25b (25c) along its longitudinal direction and at predetermined intervals in the circumferential direction. Therefore, the structure of the forming tool 15 can be simplified, the manufacturability of the forming tool 15 can be improved, and the manufacturing cost can be reduced.

[0076] In addition, when forming in an L-shaped cross section as in the upper plate 2A shown in FIG. 3A, the bearing portion 13 may have a shape in which the first through hole 16a, one of the second through holes 16b, and the third through hole 16c are formed as shown in FIG. 11. When having a rib on the back surface as in the upper plate 2B shown in FIG. 3B, the through hole in the bearing portion 13 may be formed in the same shape as the outer shape of the upper plate 2B excluding the recessed portion 2e.

[0077] Also, when forming a hollow portion as in the upper plate 2C shown in FIG. 3C, it can be formed by an extrusion die 11A using an upper die 13A provided with an outer bearing portion for forming the outer shape of the upper plate 2C and an inner bearing portion for forming the inner shape of the upper plate 2C. FIGS. 16 and 17 are cross-sectional views for explaining an example of the configuration. The upper die 13A shown in FIGS. 16 and 17 includes a male die 32 that supports a mandrel portion 31 for forming the hollow portion of the upper plate 2C, and a female die 33 that supports the male die 32 and forms the supplied metal M into a desired outer shape. That is, the male die 32 is integrally provided upstream of the female die 33 in the moving direction of the metal M. Note that the outer dimensions of the male die 32 and the female die 33 are formed to be substantially the same.

[0078] The male die 32 is provided with a cross-shaped bridge 34 for flowing the metal M and holding the mandrel portion 31. A support shaft 35 is formed downward from the central portion of the bridge 34, and the mandrel portion 31 is provided at the tip of the support shaft 35.

[0079] The mandrel portion 31 shown in FIGS. 16 and 17 is formed such that its lower end surface extends below the horizontal position of the rotation center of the outer bearing portion 36 in the female die 33 and the molding tool 15 provided on the lower die 14A, which will be described later. That is, the mandrel portion 31 is formed downstream of the position where the molding tool 15 presses the metal M as will be described later in the moving direction of the metal M.

[0080] Above the mandrel portion 31, an inner bearing portion 37 is formed to be substantially the same as the inner shape of the upper plate 2C, that is, having a square cross-sectional shape. Also, on the surface of the portion below the inner bearing portion 37 that faces the molding tool 15, a relief portion 38 is formed to suppress the formation of uneven shapes on the inner surface when the outer surface of the metal M is pressed by the molding tool 15. On the other side surface, an inner guide portion 39 for guiding the metal M is formed. That is, an inner bearing portion 37 with relatively larger outer dimensions is formed on the upstream side in the moving direction of the metal M, and a relief portion 38 with smaller outer dimensions than the inner bearing portion 37 is formed on the downstream side. Note that the relief portion 38 and the inner guide portion 39 are formed up to the tip of the mandrel portion 31.

[0081] The relief portion 38 is formed by being recessed by a predetermined depth from the outer surface of the inner bearing portion 37 and along the vertical direction. In contrast, the inner guide portion 39 is formed to be inclined so as to gradually taper downward.

[0082] The female mold 33 is formed with a slightly recessed central portion for placing the male mold 32 described above. In the recessed portion, a concave portion 40 is formed for shaping the metal M that has passed through the bridge 34 in the male mold 32 into a square shape, which is the intended outer shape of the extrusion molding. In the following description, the concave portion 40 is referred to as the first metal reservoir portion 40.

[0083] At the central portion of the first metal reservoir 40, a second metal reservoir 41 is formed continuously with the first metal reservoir 40. The upper opening of this second metal reservoir 41 is formed larger than the intended outer dimensions of the upper plate 2C. Also, the lower side of the second metal reservoir 41 is formed such that the inner diameter gradually decreases. And further, below the second metal reservoir 41, a third metal reservoir 42 is formed continuously with the second metal reservoir 41 and having an opening narrower than that of the second metal reservoir 41. That is, the first metal reservoir 40, the second metal reservoir 41, and the third metal reservoir 42 are formed such that the outer dimensions of the metal M gradually decrease as the metal M progresses.

[0084] Also, downstream of the third metal reservoir 42 and at a position facing the inner bearing portion 37 in the mandrel portion 31 described above, an outer bearing portion 36 is formed continuously with the third metal reservoir 42 and having an opening narrower than that of the third metal reservoir 42. This outer bearing portion 36 is a portion for finishing the outer shape of the metal M into the intended outer shape of the upper plate 2C. Therefore, the inner dimensions of the outer bearing portion 36 are formed to be substantially the same as the intended outer dimensions of the upper plate 2C. Also, as described above, since the inner bearing portion 37 is formed to be substantially the same as the inner shape of the upper plate 2C, when the metal M passes between the inner bearing portion 37 and the outer bearing portion 36, the shapes other than the concave portion 2e, which is the anti-slip pattern of the upper plate 2C, and the shape of the metal M are configured to be the same. That is, a groove (through hole) for forming the rib portion 2d is formed in the outer bearing portion 36.

[0085] Furthermore, below the outer bearing portion 36, an upper guide portion 43 is formed continuously with this outer bearing portion 36. This upper guide portion 43 is a portion for guiding the metal M formed and extruded by the outer bearing portion 36 toward the lower die 14A side.

[0086] More specifically, a protruding portion 19 protruding toward the downstream side is provided on the side surface corresponding to the portion where the molding tool 15 is provided among the lower side surfaces of the outer bearing portion 36, or on the side surface located above the molding tool 15. The protruding portion 19 is formed along a part of the outer periphery on the upper side of the molding tool 15 and so as to cover a part of the outer periphery. The surface of the protruding portion 19 facing the metal M is formed so as to have a predetermined gap from the metal M, and this portion is configured to function as the upper guide portion 43. Further, the side surface where the protruding portion 19 is not formed is inclined so that the gap with the metal M increases as the metal M advances, and the inclined surface is configured to function as the upper guide portion 43. As shown in FIG. 16, a convex portion 44 protruding toward the lower die 14A side is formed on a part of the lower surface of the female die 33, and the convex portion 44 is configured to fit into a positioning hole 45 formed in the lower die 14A.

[0087] As shown in FIG. 18, the lower die 14A is formed in a columnar shape, and a circular recess 46 slightly recessed is formed on its upper surface for placing the circular protrusion 33a formed on the back surface of the female die 33 in a fitting state. In the lower die 14A, a space 18 for arranging the molding tool 15 is formed near the substantially central portion of its plane, and this space 18 is a substantially rectangular through-hole. Further, mounting member installation holes 21 for installing the mounting member 20 are formed on both sides adjacent to each other along the length direction of this space 18.

[0088] Note that the structure of the mounting member 20, the position adjustment mechanism for positioning the mounting member 20, and the configuration of the molding tool 15 can be configured in the same manner as the example shown in FIGS. 13 to 15, and the description thereof is omitted.

[0089] As shown in FIG. 18, the molding tool 15 is arranged to the right of the space 18, and a space SP with a predetermined width is provided on the left side of the molding tool 15, and this portion of the space SP serves as the insertion portion P for the extruded metal M.

[0090] The lower die 14A is formed with a lower guide portion 47 for guiding the metal M. As shown in FIGS. 16 and 17, this lower guide portion 47 is formed from its upper end surface to its lower end surface. Further, as shown in FIGS. 16 and 17, the lower guide portion 47 is formed with an opening area larger than the opening area on the lower end side of the upper guide portion 43, and is formed along the axial direction of the lower die 14A.

[0091] On the surface of the inner surface of the lower die 14A that faces the relief portion 38 in the mandrel portion 31, a molding tool 15 for forming a recess in the rib portion 2d of the metal M sandwiched between it and the relief portion 38 is disposed, and the rib portion 2d of the metal M is formed by sandwiching it between the molding tool 15 and the relief portion 38.

[0092] Note that according to the inner diameter shape and outer diameter shape of the upper plate 2C, the outer diameter shape of the inner bearing portion 37 and the inner diameter shape of the outer bearing portion 36 may be appropriately changed. Therefore, for example, when molding the upper plate 2C to have a thin thickness, the width of the inner bearing portion 37 in the plate thickness direction may be made thinner, and the inner diameter dimension of the outer bearing portion 36, that is, the distance between the opposing surfaces, may be made shorter.

[0093] Next, a method for molding the upper plate 2 (2A, 2B, 2C) using the extrusion dies 11, 11A configured as described above will be described. Prior to the operation, a molding tool 15 for forming a recess 2e on the surface of the metal M is set in the upper die 13 or the lower die 14A. At this time, in order to make the amount by which the top of the molding tool 15 bites into the surface of the rib portion 2d of the metal M formed by the bearing portion 13c (outer bearing portion 36), that is, the depth dimension of the recess 2e, a desired dimension, the position of the molding tool 15 is set by the positioning bolt 23.

[0094] Metal M is introduced from the container 12 into the upper dies 13, 13A. Further, when it is pushed downstream via the metal introduction recess 13b, as the metal M passes between the bearing portion 13c (outer bearing portion 36), the outer shape of the metal M is formed into the intended shape having the convex strip portion 2d. The metal M is pushed out toward the lower dies 14, 14A along the upper guide portions 17, 43 of the upper dies 13, 13A. Since the protruding portion 19 is formed so as to cover the molding tool 15 provided on the upper dies 13, 13A, in particular, it is possible to suppress contact with the molding tool 15 before the tip portion at the time when the metal M starts to be pushed out is sandwiched between the molding tool 15 and the relief portions 17a, 38. That is, the pressing force of the molding tool 15 can be applied to the intended position of the metal M.

[0095] Then, the metal M pushed out to the upper guide portions 17, 43 is pushed downward while being guided by the upper guide portions 17, 43. During this process, the concave portions 2e are continuously formed on the surface of the convex strip portion 2d by the molding tool 15 that rotates as the metal M is pushed out. That is, the molding tool 15 is configured to rotate using the load that presses the metal M against the extrusion dies 11, 11A.

[0096] When it is desired to change the amount of penetration by the top of the molding tool 15, for example, when reducing the amount of penetration, turn the position adjustment bolt 23 in the reverse direction to make the attachment member 20 slidable within the attachment member installation hole 21. Next, after pulling it toward the position adjustment bolt 23 side of the molding tool 15, insert a predetermined adjustment spacer 29 into the attachment member installation hole 21 so as to obtain a predetermined amount of penetration by the top of the molding tool 15, and screw in the position adjustment bolt 23 until it abuts against the side surface of the attachment member 20. In this state, as described above, operate the container 12 to supply the aluminum alloy to the extrusion dies 11, 11A, and form the concave portions 2e on the surface of the metal M (upper plates 2, 2A, 2B, 2C) by the molding tool 15.

[0097] As described above, the rib portion 2d is formed on the metal M by the bearing portion 13c (outer bearing portion 36). After that, the top of the forming tool 15 is made to bite into the rib portion 2d to form the concave portion 2e in the rib portion 2d, so that after forming the extrusion molded material, the concave portion 2e of the desired pattern can be continuously formed without performing secondary processing or the like for forming the concave portion 2e. As a result, the number of manufacturing steps of the upper plate 2 (2A, 2B, 2C) can be reduced, and thus the costs of a stepladder, a stool, or a ladder using the upper plate 2 (2A, 2B, 2C) can be reduced.

[0098] Further, after the rib portion 2d is formed by the bearing portion 13c (outer bearing portion 36), the concave portion 2e is formed by the forming tool 15. By adjusting the amount of penetration of the forming tool 15 into the metal M, only the depth of the concave portion 2e can be appropriately adjusted. Therefore, by reducing the contact area between the top of the forming tool 15 and the metal M, the stress for forming the concave portion 2e in the metal M can be improved. As a result, the concave portion 2e can be formed deeply or clearly, and the anti-slip function of the upper plate 2 (2A, 2B, 2C) can be improved. Alternatively, by forming the concave portion 2e only in the rib portion 2d, it is possible to suppress a decrease in the plate thickness of the top plate portion 2a and to suppress a decrease in the bending rigidity of the upper plate 2 (2A, 2B, 2C) manufactured by the extrusion die 11.

[0099] Note that the concave portion 2e formed in the upper plate 2 (2A, 2B, 2C) is not limited to the above-described X shape, rectangular shape, or V shape, and other shaped patterns, for example, concave portions having a semicircular cross section or a polygonal cross section may be formed.

[0100] In the above embodiment, the case where the material of the product is an aluminum alloy has been described. However, the material of the product is not limited to the aluminum alloy, and general plastics such as PP (polypropylene) and PE (polyethylene), or synthetic resins such as engineering plastics such as PA (polyamide) may be used.

[0101] Furthermore, the above upper plate 2 (2A, 2B, 2C) is not limited to being used for the single-step platform 1 shown in FIG. 1, and may also be used for a multi-step platform. In that case, the upper plate 2 can be used as the tread plate for each step. Also, the upper plate 2 (2A, 2B, 2C) may be used for applications that require an anti-slip function, such as the upper plate of a step ladder or the steps of a step ladder or a ladder.

Explanation of Signs

[0102] 1 Platform 2, 2A, 2B, 2C Upper plate 2a Top plate part 2b Side wall part 2c Reinforcement part 2d Rib part 2e Recess 11, 11A Dies 12 Container 13, 13A Upper die 13c Bearing part 14, 14A Lower die 15 Molding tool 17a, 38 Relief part 20 Mounting member 23 Position adjustment bolt 25a, 25b, 25c Forming rib part 29 Adjustment spacer 36 Outer bearing part 37 Inner bearing part M Metal

Claims

1. A plate-shaped extruded material formed by continuously extruding a thermoplastic member, and a plate material with an anti-slip function in which uneven portions with an anti-slip pattern are formed on the upper surface portion where people ride on the extruded material, The extruded material is provided with a reinforcing convex portion that protrudes vertically from the back surface portion opposite to the upper surface portion and increases the bending rigidity of the extruded material, The uneven portion is composed of a plurality of convex strip portions formed along the longitudinal direction of the extruded material and at a predetermined interval in the width direction, and a concave portion formed on the top surface of the convex strip portion intersecting the longitudinal direction. A plate material with an anti-slip function, characterized in that.

2. The plate material with an anti-slip function according to Claim 1, The extruded material further includes a reinforcing portion that bends from the lower end portion of the reinforcing convex portion toward the width direction of the extruded material and is parallel to the upper surface portion. A plate material with an anti-slip function, characterized in that.

3. The plate material with an anti-slip function according to Claim 1, The depth of the concave portion is formed shallower than the height of the convex strip portion. A plate material with an anti-slip function, characterized in that.

4. The plate material with an anti-slip function according to Claim 1, The extruded material is formed in a substantially channel shape in cross section having side wall portions bent vertically from both ends in the width direction, The reinforcing convex portion includes the side wall portion. A plate material with an anti-slip function, characterized in that.

5. The plate material with an anti-slip function according to any one of Claims 1 to 4, The concave portion is a plurality of concave portions having a predetermined pattern shape repeatedly formed in the longitudinal direction of the extruded material. A plate material with an anti-slip function, characterized in that.

6. The plate material with an anti-slip function according to Claim 5, The plurality of concave portions having the predetermined pattern shape are X-shaped concave portions intersecting at the top surface of the convex strip portion. A plate material with an anti-slip function, characterized in that.

7. The plate material with an anti-slip function according to Claim 5, The plurality of concave portions having the predetermined pattern shape are concave portions having a rectangular cross-sectional shape. A plate material with an anti-slip function, characterized in that.

8. The plate material with an anti-slip function according to Claim 5, The plurality of concave portions having the predetermined pattern shape are concave portions having a V-shaped cross-sectional shape. A plate material with an anti-slip function, characterized in that.

9. An apparatus for manufacturing a plate material with an anti-slip function for forming uneven portions on the surface of a plate material formed of a thermoplastic member continuously extruded from a material supply side, An upper die for introducing the thermoplastic member, a lower die for supporting the upper die, and a molding tool that rotates as the thermoplastic member moves to form a recess on the surface of the thermoplastic member. The upper die includes a first through hole that forms the thermoplastic member into a flat rectangular cross-section as the thermoplastic member flows, a second through hole that is formed to protrude from one long side of the first through hole and forms a reinforcing convex portion that increases the bending rigidity of the thermoplastic member, and a third through hole that protrudes from the inner side in the length direction of the long side of the first through hole to the other long side of the first through hole and is formed with a predetermined interval therebetween to form a rib portion along the flow direction of the thermoplastic member, and has a bearing portion. The molding tool has a molding rib portion that forms the recess in a direction intersecting the rib portion by pressing the top surface of the rib portion. A manufacturing apparatus for a plate material with an anti-slip function, characterized by the above.

10. A manufacturing apparatus for a plate material with an anti-slip function according to claim 9, wherein the molding tool is rotatably provided below the bearing portion in the upper die, and further includes a position adjusting mechanism for adjusting the position of the molding tool so as to adjust the distance between the position where the thermoplastic member advances and the molding tool. A manufacturing apparatus for a plate material with an anti-slip function, characterized by the above.

11. A manufacturing apparatus for a plate material with an anti-slip function according to claim 10, wherein the position adjusting mechanism is configured to adjust the position of the molding tool to a position where the depth of the recess is shallower than the height of the rib portion. A manufacturing apparatus for a plate material with an anti-slip function, characterized by the above.

12. A manufacturing apparatus for a plate material with an anti-slip function according to any one of claims 9 to 11, wherein the second through hole is formed to communicate with both ends in the longitudinal direction of the first through hole, and the bearing portion is configured to form the thermoplastic member into a substantially channel-shaped cross-section having the rib portion along the advancing direction of the thermoplastic member. A manufacturing apparatus for a plate material with an anti-slip function, characterized by the above.

13. A manufacturing method for a plate material with an anti-slip function, which continuously extrudes a thermoplastic member from a material supply side and forms uneven portions on the surface of the thermoplastic member as the thermoplastic member advances. By passing the thermoplastic member through a bearing portion formed in an upper die into which the thermoplastic member is introduced, the outer shape of the thermoplastic member is formed into a desired shape having a rib portion along the advancing direction of the thermoplastic member and a reinforcing convex portion protruding on the side opposite to the rib portion. Thereafter, a concave portion in a direction intersecting the rib portion is formed by pressing the top surface of the rib portion with a forming tool having a predetermined formed rib portion. A method for manufacturing a slide-resistant functional sheet material, characterized by the above.

14. A method for manufacturing a slide-resistant functional sheet material according to claim 13, After adjusting the distance between the position where the thermoplastic member advances and the forming tool by a position adjusting mechanism for adjusting the position of the forming tool, The thermoplastic member is continuously extruded to form the concavo-convex portions on the surface of the thermoplastic member. A method for manufacturing a slide-resistant functional sheet material, characterized by the above.

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