Rope body retaining metal fitting

Abstract

To provide a rope body retaining metal fitting that is more user-friendly regarding a metal fitting (robe body retaining metal fitting) using a wedge for retaining a rope body such as wire rope.SOLUTION: A rope body retaining metal fitting 1 comprises a fitting member 11 comprising a cylindrical body part into which a rope body is inserted, and a driving member 12 having a wedge-shaped part inserted into the cylindrical body part and being in contact with the rope body in the cylindrical body part. The driving member 12 has, on a surface on a side that is in contact with the rope body, a V-shaped groove part 121 configured to contact the rope body on two sides, and a weak fastening part 122 that has a smaller fastening force on the rope body than the V-shaped groove part 121.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cable anchor for securing a cable such as a wire rope. [Background technology]

[0002] A metal fitting using a wedge is used as a metal fitting for holding a cable such as a wire rope. Patent Document 1 discloses a technique relating to such a metal fitting using a wedge (wedge clamp). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6009611 Summary of the Invention [Problem to be solved by the invention]

[0004] The wedge clamp (rope retaining fixture) disclosed in Patent Document 1, as described in Patent Document 1, is configured such that when tension is applied to the rope, slippage between the rope and the wedge member is prevented, and they enter the restraining member (cylindrical member) as a single unit, thereby obtaining a higher fastening force, and has excellent fastening force. The cable retaining fixture that utilizes the principle of a wedge clamp, as disclosed in Patent Document 1, is easy to work with and, as mentioned above, provides high anchoring efficiency, so it is being used in a wide range of applications. With such diversification of applications, there is a demand for more user-friendly cable fasteners.

[0005] In view of the above, the present invention relates to a fitting (rope fastening fitting) using a wedge for fastening a rope such as a wire rope, and aims to provide a rope fastening fitting that is easier to use. [Means for solving the problem]

[0006] (Configuration 1) A rope fastening fitting comprising: a fitting member having a tubular body portion through which a rope is inserted; and a driving member having a wedge-shaped portion inserted into the tubular body portion and abutting against the rope within the tubular body portion, wherein the driving member has a V-shaped groove portion on the surface that comes into contact with the rope, the V-shaped groove portion being configured to come into contact with the rope on two sides, and a weak fastening portion that has a weaker fastening force on the rope than the V-shaped groove portion.

[0007] (Configuration 2) 2. The cable end clamp according to claim 1, wherein the weak fastening portion is formed on the front side of the V-shaped groove portion in the driving direction of the driving member.

[0008] (Configuration 3) 3. The cable anchor according to claim 1, wherein the weak fastening portion has a concave shape in a cross section perpendicular to the driving direction of the driving member.

[0009] (Configuration 4) A cable fastening fitting as described in any one of configurations 1 to 3, wherein the ratio of the area where the weak fastening portion is formed to the area where the V-shaped groove portion and the weak fastening portion are formed in the driving direction of the driving member is 40% or more. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a wedge-based fitting (rope anchor) for anchoring a rope such as a wire rope, which is easier to use. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing a cable retainer according to an embodiment of the present invention; [Figure 2] 1 is a diagram showing a fitting member of a cable retaining fixture according to an embodiment; [Figure 3] FIG. 10 is a diagram showing a driving member of the cable retaining fitting according to the embodiment; [Figure 4]Schematic diagram showing a state in which a rope (wire rope) is inserted into the rope fastening fitting of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following embodiments are merely examples of how the present invention can be realized, and are not intended to limit the scope of the present invention.

[0013] Fig. 1 is a perspective view showing a cable end clamp (with the driving member detached from the fitting member) according to an embodiment of the present invention. Fig. 4 is a schematic diagram showing a cable (wire rope WR) inserted into the cable end clamp of this embodiment, with Fig. 4(a) being a schematic cross-sectional view taken along the longitudinal direction (a conceptual diagram showing the positional relationship of each member when the driving member has not been driven (no fastening force is being generated)), Fig. 4(b) being a conceptual cross-sectional view of the position of the weak fastening portion when the driving member has been driven in, and Fig. 4(c) being a conceptual cross-sectional view of the position of the V-shaped groove when the driving member has been driven in. As shown in FIG. 4, the cable end clamp 1 of this embodiment is used to form an eye at the end of a cable such as a wire rope WR in order to hold the end of the cable. The cable retaining fixture 1 of this embodiment is: a fitting member 11 having a cylindrical body portion through which a cord is inserted; a driving member (12) having a wedge-shaped portion inserted into the cylindrical body portion of the fitting member (11) and abutting against the cord body inside the cylindrical body portion; On the surface of the driving member 12 that comes into contact with the rope body, A V-shaped groove portion 121 configured to contact the cord body on two surfaces; a weak fastening portion 122 that has a weaker fastening force to the rope body than the V-shaped groove portion 121; is formed. In the rope clamp 1, the wedge-shaped portion of the driving member 12 and the rope are inserted into the tubular portion of the fitting member 11 (as shown in Fig. 4(a)), and when the driving member 12 is driven in in the state shown in Fig. 4(a), the rope is restrained by the pressure generated by the wedge shape of the driving member. The basic function and the configuration therefor are the same as those of the wedge clamp disclosed in Patent Document 1, so the explanation thereof will be omitted or simplified below.

[0014] 2A to 2E are diagrams showing the fitting member 11, with Fig. 2(a) being a top view, Fig. 2(b) being a front view, Fig. 2(c) being a side view, Fig. 2(d) being a rear view, and Fig. 2(e) being a bottom view. For ease of explanation, the front side of the driving member 12 along the rear side after driving (the left side in FIG. 2(c)) is referred to as the "front face," and the opposite side (the right side in FIG. 2(c), the side into which the driving member 12 is inserted) is referred to as the "rear face." Additionally, the side of the driving member 12 that comes into contact with the fitting member (the lower side in FIG. 2(c)) is referred to as the "bottom face," and the opposite side (the upper side in FIG. 2(c)) is referred to as the "top face." The engaging member 11 has a cylindrical body formed into a tapered cylindrical shape and is used to restrain the driving member 12 and a rope such as a wire rope.When the driving member 12 and the rope enter the tapered internal space of the cylindrical body of the engaging member 11, a strong frictional force is generated between the respective components, thereby restraining the rope. In order to obtain an effective restraining force for the cord in this function, a V-shaped groove (V-shaped groove on the cylindrical body side) 111 configured to contact the cord on two sides is formed on the inner surface of the upper surface of the cylindrical body of the fitting member 11. This V-shaped groove 111 itself is similar to the wedge clamp disclosed in Patent Document 1, so a description of the V-shaped groove itself will be omitted here. The inner part of the opening on the front side of the tubular body is chamfered (tapered) to form a chamfered portion 112, so that the corners do not come into contact with the rope body and cause a high local load (to reduce the risk of the rope body breaking, etc.). Through holes 113 are formed in the lower rear portions of both side surfaces of the cylindrical body, and when the driving member 12 has been driven to a predetermined position, a pin member can be inserted into the through holes 113 (the pin member can be positioned so as to engage with the engaging portion 123 (see FIG. 3(c)) of the driving member 12). This configuration ensures that the driving member 12 is driven to a predetermined position and prevents the driving member 12 from retracting (loosening the fastening).

[0015] 3A to 3E are diagrams showing the driving member 12, with FIG. 3A being a top view, FIG. 3B being a front view, FIG. 3C being a side view, FIG. 3D being a rear view, and FIG. 3E being a bottom view. When viewed from the side, the driving member 12 has a wedge shape between its bottom surface and its top surface (a V-shaped groove portion 121 in which a V-shaped groove (a V-shaped groove on the driving member side) is formed), and the pressure generated when this wedge-shaped portion is driven into the inside of the tubular body portion of the fitting member 11 together with the rope body generates frictional forces between the fitting member 11, the driving member 12 and the rope body, thereby fastening it to the rope body. The V-shaped groove 121 itself provided in the driving member 12 is similar to the wedge clamp disclosed in Patent Document 1, and therefore a description of the V-shaped groove 121 itself will be omitted here.

[0016] The driving member 12 has a weak fastening portion 122 formed on the front side of the V-shaped groove portion 121. In this embodiment, the weak fastening portion 122 has a concave shape in a cross section perpendicular to the driving direction of the driving member. The weak fastening portion 122, which is a concave groove, is formed so that its groove width (the distance between both side surfaces of the concave groove) is equal to or greater than the diameter of the rope, and the both side surfaces of the concave groove do not basically generate a fastening force to the rope. In addition, the bottom surface of the groove is formed continuous with (on the same plane as) the bottom surface of the V-shaped groove portion 121. The weak fastening portion 122 is formed so that the ratio of the area where the weak fastening portion 122 is formed to the area where the V-shaped groove portion 121 and the weak fastening portion 122 are formed in the driving direction of the driving member is 40% or more.

[0017] The weak fastening portion 122 is not a V-shaped groove that contacts the rope on two sides as described in Patent Document 1, but basically contacts the rope at its bottom (the side of the groove may also come into contact with the rope, but such contact does not generate a substantial fastening force). Therefore, the force that fastens the rope at the weak fastening portion 122 is smaller than the fastening force at the V-shaped groove portion 121.

[0018] For example, a wire rope anchor for fastening a relatively thick wire rope (wire) with a diameter of 18 mm or more naturally becomes larger as the diameter of the wire rope increases. Furthermore, thick wire ropes are used when high tension is applied, and therefore the wire rope anchor used for such wire ropes is required to have a corresponding fastening force. As a result, conventional rope fasteners, in which a V-shaped groove was formed along almost the entire length of the driving member, required a large driving force for the driving member, making it difficult to drive in manually using a hammer, etc. Furthermore, conventional rope fasteners, in which a V-shaped groove was formed along almost the entire length of the driving member, tightened the rope with a high fastening force even at the front end (the side where the eye part of the rope is formed), so when a relatively thick rope was fastened with a high fastening force, the amount of deformation of the rope also increased, and the load on the rope at the boundary (the base of the eye part) increased, making it more likely to break at this point. It is possible to reduce the driving force of the driving member by shortening the driving member (shortening the length of the V-shaped groove in the driving direction), but if the driving member is shortened (shortening the length of the V-shaped groove in the driving direction), the driving distance must be increased to obtain the same fastening force. In other words, the fastening force per unit length needs to be increased, which requires a greater driving force. Therefore, the amount of deformation of the rope at the fastened point also increases. This causes the problem that the load on the rope at the boundary of the fastened part mentioned above becomes greater (increasing the risk of breakage, etc.). In contrast, the rope fastening fitting 1 of this embodiment has a weak fastening portion 122 (shortening the V-shaped groove), which makes it easier to drive in compared to conventional rope fastening fittings that have a V-shaped groove formed along their entire length. Also, by having the weak fastening portion 122 on the front side (the side where the eye of the rope is formed), it is possible to reduce the increase in load on the rope at the base of the eye, and to reduce the risk of the rope breaking at this portion.

[0019] As described above, the cable fastening fitting 1 of this embodiment can be made easier to use as a fitting (cable fastening fitting) using a wedge for fastening a cable such as a wire rope.

[0020] In this embodiment, the weak fastening portion has a concave shape in a cross section perpendicular to the driving direction of the driving member, but the present invention is not limited to this. The weak fastening portion may have a smaller fastening force on the rope than the V-shaped groove. For example, the V-shaped groove that generates the main fastening force may have a relative angle of less than 42° between the two faces, while the weak fastening portion may be formed as a second V-shaped groove in which the relative angle between the two faces is greater than 42°. Alternatively, the weak fastening portion may be formed as a simple flat portion without side surfaces (not concave). Furthermore, in this embodiment, the bottom surface of the groove of the weak fastening portion is formed continuously with (on the same plane as) the bottom surface of the V-shaped groove, but the present invention is not limited to this, and the bottom surface of the groove of the weak fastening portion and the bottom surface of the V-shaped groove may not be on the same plane. For example, the bottom surface of the groove of the weak fastening portion may have a step with respect to the bottom surface of the V-shaped groove, or the bottom surface of the groove of the weak fastening portion may be provided at an angle (an angled surface in which the inner diameter of the cylindrical body increases toward the opening at the end of the cylindrical body, i.e., a tapered shape in which the inner diameter increases toward the opening), etc.

[0021] In this embodiment, an example is given in which a weak fastening portion 122 is formed on the front side of the V-shaped groove portion 121 (one V-shaped groove portion 121 and one weak fastening portion 122), but the present invention is not limited to this, and it may also be possible to have either or both of the weak fastening portions of the V-shaped groove portion provided in two or more locations (for example, multiple weak fastening portions of the V-shaped groove portion formed alternately). As can be understood from the above explanation, it is preferable that the weak fastening portion is provided at the front end of the driving member where the eye portion is formed, but it may also be provided at the rear end of the driving member, thereby reducing the load on the rope body near the exit of the rear end.

[0022] In this embodiment, an example is given in which there is a step-like transition from the V-shaped groove portion 121 to the weak fastening portion 122 (the V-shaped groove portion 121 switches to the weak fastening portion 122 at a predetermined position), but the present invention is not limited to this, and for example, it may be one in which the shape gradually changes from the V-shaped groove portion to the weak fastening portion by having a tapered shape, etc.

[0023] In this embodiment, an example is given in which a V-shaped groove is provided inside the tubular body that abuts against the rope on two sides, allowing two folded ropes to be inserted through to perform eye processing (see Figure 4), but the present invention is not limited to this, and the concept of the present invention can also be applied to a tubular body that does not have a V-shaped groove inside (one in which a single rope is inserted and fastened), as described in, for example, embodiment 1 of Patent Document 1.

[0024] Furthermore, in the embodiment of the rope retaining fitting 1, the V-shaped groove that contacts the rope on two sides prevents slippage between the rope and the V-shaped groove by setting the angle of the two sides to a predetermined angle, as described in Patent Document 1, and while this is very preferable, it is not essential for the application of the present invention.

[0025] Additionally, in the embodiment, the driving member is generally composed of only a wedge-shaped portion, and the fitting member is generally composed of only a cylindrical portion, but the present invention is not limited to this. Anything can be provided as long as it includes a driving member having a wedge-shaped portion and a fitting member that fits into the driving member to restrain the rope by pressure generated by the wedge shape of the driving member (each of these components may additionally have other functions or structural parts). [Explanation of symbols]

[0026] 1... Cable body clamp 11...Fitting member 12...Driven-in parts 121...V-shaped groove 122...Weak fastening section

Claims

1. a fitting member having a cylindrical body portion through which the cord is inserted; a driving member having a wedge-shaped portion inserted into the cylindrical body portion and abutting against the cord body inside the cylindrical body portion; On the surface of the driving member that comes into contact with the rope body, A V-shaped groove configured to contact the cord body on two surfaces; a weak fastening portion that has a weaker fastening force to the rope than the V-shaped groove portion; A cable retaining fitting formed with the following.

2. 2. The cable anchor according to claim 1, wherein the weak fastening portion is formed on a front side of the V-shaped groove in a driving direction of the driving member.

3. 2. The cable anchor according to claim 1, wherein the weak fastening portion has a concave shape in a cross section perpendicular to the driving direction of the driving member.

4. A cable fastening fixture as described in any one of claims 1 to 3, wherein the ratio of the area where the weak fastening portion is formed to the area where the V-shaped groove portion and the weak fastening portion are formed in the driving direction of the driving member is 40% or more.

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