Antislip structure

Abstract

To provide an antislip structure of a metallic member, which retains its antislip performance although a water component or the like adheres, in the case where antislip parts are exposed, and further, which secures a joint area for an adherend as planned, when the antislip parts are coated with an antislip material, and which effectively functions as a coming-off stopper and a whirl stopper.SOLUTION: Provided is an antislip structure by form rolling for improving holding power of a surface of a metallic member. The antislip structure includes a knurl constituted of a plurality of concavities 2, and a plurality of protrusions 3 held between the concavities 2, 2, on a surface of the metallic member. The concavities 2 and protrusions 3 comprise transfer parts formed as respective slope faces 4. The protrusions 3 comprise a non-transfer part 5 held by an upper end edge of the slope faces 4 at a respective apex and comprise irregular concavities and protrusions on the non-transfer parts 5 respectively.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an anti-slip structure for metal parts that serves as a handhold or foothold during work or exercise, or an anti-slip structure at the joint of a metal part that is connected to or covered by another part. [Background technology]

[0002] 2. Description of the Related Art Knurling has been known as one of the processing methods for forming fine irregularities on metal. There are two types of knurling: cutting, in which the surface of the object to be machined (hereinafter referred to as the "workpiece") is scraped away, and rolling, in which the workpiece is deformed by applying pressure while being rolled. Cutting is characterized by pressing a rolling tool (hereinafter referred to as the "die") against the workpiece, which is mainly rotated on a lathe, to cut it so as to form equally spaced grooves, while rolling is characterized by pressing a die with the same shape or pattern as the desired unevenness against the workpiece, and transferring that shape or pattern onto the surface of the workpiece.

[0003] The first function required for the knurling formed by knurling is to act as an anti-slip function on metal parts that serve as handholds or footholds during work or exercise. By forming the knurling on the surface of the handhold or foothold, the slipperiness of the surface of the metal part is suppressed (see Patent Document 1 or Patent Document 2 below). The second function is to prevent slipping out or rotation at the part where multiple metal parts are connected. In other words, by applying the knurling to the joint part of the part to be pressed in or inserted, the connecting action due to friction and bite is strengthened. Generally, knurling produces a pattern known as a straight or twill pattern, but there are also knurls with patterns known as diagonal or square patterns.

[0004] In conventional knurling, a cutting die is attached to a lathe and a pattern is cut into the material with strong pressure. This processing method cuts away the surface of the material, which not only produces shavings but also generates sharp burrs on the cut part. In knurling by rolling, a rolling die is attached to a lathe and the rolling die is pressed against the material with high pressure to transfer the pattern of the pressing surface of the rolling tool. This processing method does not cut the material, so no shavings are generated, and the depressions that form the pattern and the raised parts that are raised along the depressions are formed by plastic deformation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 58-69700 [Patent Document 2] JP 2001-25143 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in conventional knurling by cutting, the anti-slip effect of the knurling is reduced by the application of a coating for the purpose of deburring, anti-corrosion treatment, etc., and in conventional knurling by rolling, the knurling is performed so that the raised portions are smooth, so that the anti-slip effect is weakened by the adhesion of sweat, rain, and other moisture.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide an anti-slip structure which, when the anti-slip portion is exposed, does not lose its anti-slip performance even when liquids such as moisture adhere to it, and, when the anti-slip portion is covered with another member, can ensure the intended bonding area with the adherend, and which effectively functions to prevent slipping out and rotation. [Means for solving the problem]

[0008] The anti-slip structure of a metal member (e.g., a rod material or a ring material) according to the present invention, which has been made to solve the above-mentioned problems, is an anti-slip structure formed by rolling processing to improve the holding power of the surface of the metal member, and is characterized in that the surface of the metal member has a knurled pattern consisting of a plurality of depressions and a plurality of protrusions sandwiched between the depressions, the depressions and protrusions have transfer portions shaped as respective slopes, the protrusions have non-transfer portions at their respective tops sandwiched between the upper edges of the slopes, and each of the non-transfer portions has irregular irregularities. The anti-slip structure for a metal member according to the present invention can further adopt a configuration in which the recesses sandwiched between the raised portions are provided at their deepest portions with transfer portions formed as flat or curved surfaces.

[0009] In addition, a configuration can be adopted in which the irregular unevenness of the non-transfer portion is formed by material extruded from the recessed portion into the non-transfer portion by plastic deformation, or by a roughening treatment (e.g., blasting) applied to the surface of the metal member before the knurling is formed.

[0010] The anti-slip structure between a synthetic resin member and a metal member according to the present invention, which has been made to solve the above-mentioned problems, is an anti-slip structure formed by rolling processing in order to improve the holding force of the synthetic resin member on the surface of a metal member in a structure in which a part or all of the metal member is covered with a synthetic resin member, and is characterized in that the surface of the metal member is provided with a knurled pattern consisting of a plurality of depressions and a plurality of protrusions sandwiched between the depressions, the depressions and protrusions each have a transfer portion molded as a slope, the protrusions each have a non-transfer portion at its top sandwiched between the upper edge of the slope, and each of the non-transfer portions has irregular unevenness. The anti-slip structure between a synthetic resin member and a metal member according to the present invention can further be configured so that the recesses sandwiched between the raised portions have a transfer portion molded as a flat surface or a curved surface at the deepest part of each of the recesses.

[0011] In addition, a configuration can be adopted in which the irregular unevenness of the non-transfer portion is formed by material extruded from the recessed portion into the non-transfer portion by plastic deformation, or by a roughening treatment applied to the surface of the metal member before the knurling is formed. Here, plastic deformation refers to processing in which a material that does not return to its original shape after deformation is deformed with a constant force to obtain a desired shape. Effect of the Invention

[0012] According to the anti-slip structure of a metal member of the present invention, the anti-slip portion has a transfer portion formed as a slope on each of the recessed and raised portions of the knurled pattern, and each of the raised portions has a non-transfer portion sandwiched between the upper edges of the slope at each of the apexes of the raised portions, and each of the non-transfer portions has irregular irregularities.By adopting a structure in which the anti-slip portion is provided with a relatively high anti-slip effect even if it becomes moist.

[0013] Furthermore, by adopting a configuration in which a flat or curved surface is arranged at an obtuse angle to the slope of the protrusions at the deepest part of the depression between the protrusions, whether the metal member is insert molded with the coating material or the metal member is hot-pressed into the coated member after molding, the coating material smoothly penetrates into every corner of the depression and air is smoothly discharged without stagnation, resulting in a wide contact area and large frictional force.

[0014] In this way, according to the present invention, when the anti-slip portion is exposed, the anti-slip performance is not lost even when moisture or the like adheres to it, and when a covering member or covering material is held on the anti-slip portion, the bonding area between the covering member or covering material and the metal member can be secured as planned, thereby providing an anti-slip structure for a metal member that effectively functions to prevent slipping out and rotation. [Brief description of the drawings]

[0015] [Figure 1] 4A to 4C are cross-sectional views showing an example of a processing step for the anti-slip structure according to the present invention. [Diagram 2]1 is a plan view showing an example of the configuration of an anti-slip structure according to the present invention. [Diagram 3] 1 is a diagram showing an embodiment of an anti-slip structure according to the present invention. FIG. [Figure 4] 1A and 1B are a front view and an enlarged view showing an example of an anti-slip structure according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an anti-slip structure according to the present invention will be described in detail with reference to the drawings. The example shown here is an anti-slip structure for improving the holding power of the surface of a metal member, in which anti-slip portion 9 is formed with knurled patterns.

[0017] The knurling in this example is formed by a rolling process in which a die D is pressed against the surface of the wire 1, which is a solid or hollow material with a circular cross section, to apply pressure and cause plastic deformation. In this processing method, a die D is pressed against the surface of the wire 1, which is the workpiece, to cause the area pressed by the die D to be depressed, and the material extruded from the depressed area (hereinafter referred to as "depressed area 2") is raised along the outer edge of the depressed area 2, thereby forming a raised area 3 that becomes a convex part of the uneven pattern.

[0018] The raised portion 3 is formed with standard slopes (transfer portions) 4, 4 to which the pressure surface of the die D is transferred, and the raised portion 3 as a whole is formed so that it has an approximately trapezoidal cross-section; however, in the non-transfer portion 5 at the top (the portion to which the shape of the die D is not transferred) which is not restricted or pressed by the die D, ripples 6 of the extruded material without being molded protrude along the outer edge of the non-transfer portion 5, and the non-transfer portion 5 as a whole has an irregular surface in which irregular, non-sharp bumps and recesses are intentionally left. The anti-slip structure shown here focuses on the fact that the irregular surface formed in the non-transfer portion 5 of the raised portion 3 by the rolling process can be utilized to improve the anti-slip effect.

[0019] In order to form the knurled pattern, during rolling with the die D, the die is applied to the workpiece at a pitch and depth such that a non-transferred portion 5 is formed at the top of the raised portion 3. In other words, the pitch and depth are such that the material pushed out from the depressed portion 2 by the rolling applied to the workpiece and all of the material facing the depressed portion 2 are not exposed to pressure for the purpose of transfer by the pressure surface of the die D. For example, there is a rolling process in which the raised portion 3 generated by being raised by the die D (plastic deformation) is sufficiently wider than the depressed portions 2, 2 that sandwich the raised portion 3.

[0020] As a result of this rolling process, the raised portion 3 has a square non-transfer portion 5 at each top that does not contact the die D, which is formed flat or curved according to the surface shape of the material, and non-sharp protuberances (ripples 6) extruded by the die D are formed on the peripheral edges of the non-transfer portions 5. If no non-transferred portion 5 remains at the top of the raised portion 3, almost the entire surface of the material that makes up the raised portion 3 will be exposed to pressure from the pressure surface of the die D (almost the entire raised portion 3 will become a transferred portion), and the protruding material will overlap excessively, which may cause the excess material to become burred or promote deterioration of the die D.

[0021] In this example, the depressions 2 or protrusions 3 that form the knurling are arranged in a striped configuration in approximately the same direction so that they are parallel to each other, or in a lattice configuration in which the striped configuration intersects at an angle of 90 degrees or an angle increased or decreased by approximately 30 degrees therefrom, although a non-parallel arrangement may also be selected taking into consideration functionality or design. When the striped arrangement is adopted, ripples 6 appear in a striped pattern along the outer edges of the depressions 2, 2 adjacent to the non-transferred portion 5 of the raised portion 3, and the unevenness formed in the non-transferred portion 5 is one-dimensional (see Figure 1). However, when the lattice arrangement is adopted, ripples 6 appear in a lattice pattern along the outer edges of the depressions 2, 2, 2, 2 adjacent to the non-transferred portion 5 of the raised portion 3, and the unevenness formed in the non-transferred portion 5 is two-dimensional (see Figure 2). Furthermore, by adopting a shape for the pressure surface of the die D that leaves a flat or curved surface at the bottom of the depression 2 when it bites into the wire 1, the depression 2 sandwiched between the raised portions 3, 3 can be made to have a bottom surface 7 at the deepest part of each of the raised portions 3, 3, which is made of a flat or curved surface that is free of sharp edges.

[0022] An embodiment of the above-mentioned anti-slip structure will now be described. FIG. 4 shows an example of a hand rim 8 of a wheelchair (see FIG. 3) that has an anti-slip structure for improving the grip of the surface of the metal member. The hand rim 8 is made from an aluminum coil wire 1, and during production, after a wire drawing process, an anti-slip treatment is applied to the surface of the wire 1, and it is then shaped into an endless ring shape through a forming process in which it is formed into a circular shape of a specified length. At least the outer peripheral surface of this hand rim 8 is made into an anti-slip portion 9 (the anti-slip portion 9 may cover the entire surface), and the anti-slip portion 9 is provided with a knurled pattern consisting of a plurality of recesses 2 and a plurality of raised portions 3 sandwiched between the recesses 2, 2. Since the anti-slip portion 9 of the hand rim 8 is the portion that comes into direct contact with the user's skin, it is possible to perform deburring or form a thin protective film to the extent that it reduces irritation to the skin.

[0023] In addition to hand rims 8, the above-mentioned anti-slip structure can also be used in applications where it is exposed, such as scaffolding bolts (see the above-mentioned patent document), and can also be used in applications where it is covered, such as grip parts 10 of various tools, protective parts 11, decorative parts 12, or connecting parts 13 of multiple parts (see Figure 3).

[0024] This example is an anti-slip structure for improving the holding power of a synthetic resin material on the surface of a metal material in a structure in which part or all of the metal material is covered with a synthetic resin material or a rubber material, such as the grip part 10 of a tool or a vehicle, and the surface of the metal material is provided with a knurled pattern consisting of a plurality of recesses 2 and a plurality of raised parts 3 sandwiched between the recesses 2, 2. The knurling in this example has substantially the same structure as the knurling shown above. In particular, in this example, in order to ensure a contact area between the synthetic resin member and the metal member, a bottom surface 7 consisting of a flat or curved surface where air bubbles are unlikely to remain is formed in the deepest part of the depression 2, and the retention and friction between the coating member or coating material and the metal member is ensured by the unevenness of the depression 2 and the protrusion 3, and the uneven ripples 6 irregularly formed in the non-transfer portion 5 of the protrusion 3. With this knurled configuration, a large contact area and large frictional force can be obtained whether the metal member is insert molded with a coating material or the metal member is hot-pressed into the coating material after molding. [Explanation of symbols]

[0025] D Dice, 1 wire, 2 depression, 3 protrusion, 4 Slope, 5 Non-transferred part, 6 Ripple, 7 Bottom surface, 8 Hand rim, 9 Anti-slip part, 10 grip portion, 11 protective member, 12 decorative member, 13 connecting portion,

Claims

1. A slip-proof structure formed by rolling to improve the retention of the surface of a metal member, The metal member has a surface having a knurled pattern formed of a plurality of recesses and a plurality of raised portions sandwiched between the recesses, The depression and the protrusion each have a transfer portion formed as a slope, The raised portion has a non-transfer portion at each apex, the non-transfer portion being sandwiched between the upper edge of the slope, An anti-slip structure for a metal member, characterized in that each of the non-transfer portions has irregular projections and recesses.

2. A slip-proof structure formed by rolling to improve the retention of the surface of a metal member, The metal member has a surface having a knurled pattern formed of a plurality of recesses and a plurality of raised portions sandwiched between the recesses, The depression and the protrusion each have a transfer portion formed as a slope, The raised portion has a non-transfer portion at each apex, the non-transfer portion being sandwiched between the upper edge of the slope, Each of the non-transfer portions has irregular projections and recesses, An anti-slip structure for a metal member, characterized in that the recesses sandwiched between the raised portions each have a transfer portion molded as a flat surface or a curved surface at the deepest portion of each recess.

3. 3. The anti-slip structure of a metal member according to claim 1, wherein the irregular unevenness of the non-transfer portion is formed by material extruded from the recessed portion into the non-transfer portion by plastic deformation.

4. A non-slip structure formed by rolling to improve the retention of a synthetic resin member on a surface of a metal member in a structure in which a part or all of the metal member is covered with the synthetic resin member, The metal member has a surface having a knurled pattern formed of a plurality of recesses and a plurality of raised portions sandwiched between the recesses, The depression and the protrusion each have a transfer portion formed as a slope, The raised portion has a non-transfer portion at each apex, the non-transfer portion being sandwiched between the upper edge of the slope, An anti-slip structure between a synthetic resin member and a metal member, characterized in that each of the non-transfer portions has irregular projections and recesses.

5. A non-slip structure formed by rolling to improve the retention of a synthetic resin member on a surface of a metal member in a structure in which a part or all of the metal member is covered with the synthetic resin member, The metal member has a surface having a knurled pattern formed of a plurality of recesses and a plurality of raised portions sandwiched between the recesses, The depression and the protrusion each have a transfer portion formed as a slope, The raised portion has a non-transfer portion at each apex, the non-transfer portion being sandwiched between the upper edge of the slope, Each of the non-transfer portions has irregular projections and recesses, A non-slip structure between a synthetic resin member and a metal member, characterized in that the recesses between the raised portions each have a transfer portion molded as a flat surface or a curved surface at the deepest portion of each recess.

6. An anti-slip structure between a synthetic resin member and a metal member as described in either claim 4 or claim 5, characterized in that the irregular unevenness of the non-transfer portion is formed by material extruded from the recessed portion into the non-transfer portion by plastic deformation.

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