Cable body fastening fitting

Abstract

The present invention relates to a fitting (cable anchoring fitting) using a wedge, and provides a cable anchoring fitting having a higher fastening force through a wedge shape that has not hitherto been adopted.　A cable anchoring fitting 1 is characterized by comprising: a fitting member 11 provided with a tubular body portion through which a cable 2 is inserted; and a driven member 12 which has a wedge-shaped part to be inserted into the tubular body portion and which is brought into abutment with the cable 2 in the tubular body portion, and is characterized in that an inclined surface of the wedge-shaped part has an inclination with respect to a tilt axis extending along the driven direction of the driven member 12.

Description

[Technical field]

[0001] The present invention relates to a rope fastener for fastening a rope 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 related to such a metal fitting using a wedge (wedge clamp). The wedge clamp disclosed in Patent Document 1 is extremely excellent in that it is easy to use and provides high fixing efficiency. [Prior art documents] [Patent documents]

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

[0004] As described in Patent Document 1, the wedge clamp disclosed 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, providing greater fastening force, and thus has excellent fastening force.

[0005] The present invention relates to a fitting (rope fastener) using a wedge as described above, and has an object to provide a rope fastener with a higher fastening strength by using a wedge shape that has not been seen in the past. [Means for solving the problem]

[0006] (Configuration 1) A rope retaining fitting comprising: an engaging member having a tubular body portion through which a rope is inserted; and a driving member having a wedge-shaped portion that is inserted into the tubular body portion and abuts against the rope within the tubular body portion, wherein the inclined surface of the wedge-shaped portion is inclined about an inclined axis that is aligned with the driving direction of the driving member.

[0007] (Configuration 2) A rope retaining fitting comprising: an engaging 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 when the direction in which the driving member is driven is defined as the driving direction, the direction along the thickness of the driving member perpendicular to the driving direction is defined as the thickness direction, and the direction perpendicular to the driving direction and the thickness direction is defined as the width direction, the inclined surface of the wedge-shaped portion has an inclination component in the driving direction and an inclination component in the width direction.

[0008] (Configuration 3) The cable end fastener according to configuration 2, characterized in that when an inclination angle of the inclined surface of the wedge-shaped portion in the driving direction is θ, an inclination angle of the inclined surface of the wedge-shaped portion in the width direction is α, a divided component angle of a pushing force for driving the driving member, which is a relative angle with respect to the driving direction, is ψ, and an apparent inclination angle of the inclination angle θ when viewed from a direction along the divided component angle is α0, the relationship is expressed by the following mathematical expression 1.

[0009]

number

[0010] (Configuration 4) 4. The rope retaining fixture according to any one of configurations 1 to 3, wherein the driving member has an uneven portion formed at a portion where the driving member abuts against the rope. Effect of the Invention

[0011] According to the cable anchor of the present invention, a cable anchor with a higher fastening strength can be provided by using a wedge shape that has not been seen in the past. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing a fitting member of a cable retainer according to an embodiment of the present invention; [Diagram 2] FIG. 1 is a diagram showing a driving member of a cable retaining fitting according to an embodiment; [Diagram 3] FIG. 1 shows an embodiment of a cable retainer. [Figure 4] FIG. 1 is a diagram showing a state in which the cable retaining fixture of the embodiment is used; [Diagram 5] An explanatory diagram of the wedge-shaped inclined surface of the cable retainer [Figure 6] An explanatory diagram of the wedge-shaped inclined surface of the cable retainer [Figure 7] FIG. 13 is a diagram showing another example of a driving member; [Figure 8] FIG. 1 shows a cable retainer according to an embodiment of the present invention. [Figure 9] Diagram of tensile test [Figure 10] Photograph showing the tensile test [Figure 11] Photograph showing the tensile test [Figure 12] FIG. 1 shows a comparative example of a cable retainer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that the following embodiment is one form for realizing the present invention, and is not intended to limit the scope of the present invention.

[0014] FIG. 1 is a view showing a fitting member of a cable anchor according to an embodiment of the present invention, and FIG. 2 is a view showing a driving member. 3 and 4 are diagrams showing a cable retainer of this embodiment. The cable retaining fixture 1 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 that is inserted into the cylindrical portion of the fitting member 11 and abuts against the rope body 2 inside the cylindrical portion; By providing this, it is used to hold back the end of a rope 2 such as a wire rope. More specifically, the wedge-shaped portion of the driving member 12 and the rope 2 are inserted into the tubular portion of the fitting member 11, and when the driving member 12 is driven in, the pressure generated based on the wedge shape of the driving member 12 restrains the rope 2. In the following description, the front side (left side in Fig. 3) of the driving direction of the driving member 12 (left direction in Fig. 3) is referred to as the "tip side," and the opposite side (right side in Fig. 3) is referred to as the "rear side." Additionally, the direction along the thickness of the driving member 12 that is perpendicular to the driving direction (up and down direction in Fig. 3) is referred to as the thickness direction, and the direction perpendicular to the driving direction and the thickness direction (direction perpendicular to the paper surface in Fig. 3) is referred to as the width direction.

[0015] FIG. 1 shows a fitting member 11, where FIG. 1(a) is a top view (viewed from above in the thickness direction), FIG. 1(b) is a side view (viewed from the width direction), and FIG. 1(c) is a back view (viewed from the rear side). The fitting member 11 in this embodiment is a cylindrical member having a basic shape, and inside the fitting member 11, a through hole 11H is formed through which the driving member 12 and the cord body 2 are inserted. As shown in Fig. 1(c), contact surfaces 113a and 113b that contact the rope body 2 on two surfaces are formed on the lower side of the inner thickness direction of the through hole 11H, and thus the through hole 11H is formed in a V-shaped groove shape. The function of restraining the rope body 2 by the two surfaces of the V-shaped groove is the same as that described in Patent Document 1, and detailed description thereof will be omitted here. Incidentally, by setting the angle between the two surfaces of the V-shaped groove to a predetermined angle, slippage between the rope body 2 is prevented as described in Patent Document 1, and although it is very preferable to do so, it is not essential for the application of the present invention. The upper surface (upper side in the thickness direction) inside the through hole 11H has a first inclined surface 11T1 having a first inclination angle (relative angle with respect to the bottom surface of the through hole 11H). In addition, at the rear end side where the driving member 12 is inserted, a second inclined surface 11T2 having a second inclined angle (relative angle with respect to the bottom surface of the through hole 11H) is provided. The second inclined surface 11T2 is a surface that engages with the second inclined surface 12T2 of the driving member 12 when the driving member 12 is inserted, which will be described below. In addition, the first inclined surface 11T1 is a surface that engages with the first inclined surface 12T1 of the driving member 12 when the driving member 12 is fitted. The second inclined surface 11T2 and the first inclined surface 11T1 have inclinations corresponding to the inclinations of the second inclined surface 12T2 and the first inclined surface 12T1 of the driving member 12, which will be described below, respectively.

[0016] A recess 111 for the purpose of reducing weight is formed on the upper surface (upper side in the thickness direction) of the fitting member 11. As can be seen from FIG. 1, the recess 111 is formed in such a way that the amount of removal increases toward the front side in side view. In addition, on both side surfaces (both sides in the width direction), there are formed engagement portions 112 for engaging a jig used when driving the driving member 12. The jig has no direct relation to the present invention, and therefore a description thereof will be omitted here.

[0017] FIG. 2 shows the driving member 12, where FIG. 2(a) is a top view, FIG. 2(b) is a side view, and FIG. 2(c) is a rear view. The driving member 12 is a member having a wedge shape formed by a first inclined surface 12T1. In addition, the driving member 12 is provided with a second inclined surface 12T2 formed at the tip end side with an inclination angle larger than that of the first inclined surface 12T1. The inclination angles of the first inclined surface 12T1 and the second inclined surface 12T2 are the relative angles of the first inclined surface 12T1 and the second inclined surface 12T2 with respect to the bottom surface of the driving member 12, that is, the angle of the wedge shape. The first inclined surface 12T1 (and the second inclined surface 12T2) is formed to have an inclination component in the driving direction and an inclination component in the width direction. In other words, the first inclined surface 12T1 (and the second inclined surface 12T2) has an inclination about an inclination axis along the driving direction in addition to an inclination about an inclination axis along the width direction.

[0018] FIG. 3 is a side view showing the rope fastening fitting 1 in use (before the driving member 12 is driven in), and FIG. 4 is a rear view showing the rope fastening fitting 1 in use (after the driving member 12 has been driven in). As shown in Figure 3, the rope body 2 is inserted through the tubular body portion of the fitting member 11, and then the driving member 12 is driven into the tubular body portion, whereby the rope body 2 is restrained by the pressure generated based on the wedge shape of the driving member 12. In the cable retaining fitting 1 of this embodiment, a second inclined surface 12T2 having a larger inclination angle is formed on the tip side of the driving member 12, and a corresponding second inclined surface 11T2 is also formed on the fitting member 11, resulting in excellent workability when the driving member 12 is initially driven in.

[0019] FIG. 5 is an explanatory diagram of the wedge-shaped inclined surface of the driving member 12. As shown in FIG. 5(a) is a top view of the wedge shape of the driving member 12, and (b) is a diagram showing the inclination angle of the wedge shape in the driving direction. The meanings of the symbols in FIG. 5 are as follows: l: Length of the wedge in the driving direction θ: Incline angle of the wedge-shaped inclined surface in the driving direction α: Incline angle of the wedge-shaped inclined surface in the width direction ψ: the angle of the divided component of the pressing force for driving the driving member 12, which is the relative angle with respect to the driving direction, and the maximum fastening force is obtained at ψ=45° α0: Apparent inclination angle when the inclination angle θ is viewed from the direction along the division component angle (direction A in Figure 5) θ0: The apparent inclination angle when the inclination angle θ is viewed from the direction along the other divided component angle (direction B in Figure 5)

[0020] Based on FIG. 5, the relational expression for α is obtained as follows:

[0021]

number

[0022] That is, α has the following relation:

[0023]

number

[0024] Here, if θ = 3° and ψ = 45°, then α0 = 4.2°, and therefore α is 6°.

[0025] Next, the vertical load W (hereinafter referred to as "fastening force W") that generates a fastening force in the wedge (driving member) when a pushing force F for driving the wedge is applied will be described with reference to Fig. 6. The meanings of each symbol in Fig. 6 are as follows. F: Push-in force for driving the wedge θ: Incline angle of the wedge-shaped inclined surface in the driving direction N: Resistance generated on the inclined surface of the wedge when a pushing force F is applied P: Horizontal component of drag N W: Drag N Vertical component of (fastening force)

[0026] Based on FIG. 6, the relational equation for W is calculated as follows:

[0027]

number

[0028] That is, W has the following relation:

[0029]

number

[0030] According to the cable anchor 1 of this embodiment, a higher fastening force can be obtained due to its unconventional wedge shape. The inclination of a conventional wedge only has an inclination component in the driving direction, that is, only has an inclination about an inclination axis along the width direction. In contrast, the cable end fastener 1 of this embodiment is formed with an inclination component in the width direction in addition to the inclination component in the driving direction, that is, it also has an inclination about an inclination axis along the driving direction. This unique wedge shape makes it possible to obtain a higher fastening force against the pushing force when driving the wedge.

[0031] Fig. 7 is a diagram showing another example of a driving member. The driving member 12' in Fig. 7 has an uneven portion 122 formed at the portion where it comes into contact with the rope 2. This prevents slippage between the driving member 12' and the rope 2.

[0032] In this embodiment, the fitting member 11 is cylindrical, but the present invention is not limited to this. For example, the fitting member 11 may be rectangular prism-shaped with a through hole for inserting a driving member or a cord. In addition, in this embodiment, the fitting member is formed as a cylindrical body as a whole, but the present invention is not limited thereto, and it is sufficient that the fitting member has a cylindrical body portion, and the fitting member may have a configuration other than a cylindrical body. Similarly, in this embodiment, the driving member is formed as a wedge shape as a whole, but the present invention is not limited thereto, and it is sufficient that the driving member has a wedge-shaped portion, and the driving member may have a configuration other than a wedge-shaped portion.

[0033] In this embodiment, the contact surface (V-groove) that contacts the rope body 2 on two sides is formed on the engaging member 11 side, but the V-groove may also be formed at the point where the driving member abuts against the rope body 2.

[0034] (Example) Next, examples and the results of tensile tests for verifying the fixing efficiency will be described. Fig. 8 is a diagram showing a rope fastener 1 of the embodiment. The rope fastener of the embodiment is a rope fastener having the configuration explained in the above embodiment, and is made of S45C (carbon steel material) with the dimensions (unit: mm) shown in Fig. 8. Figs. 8(a) and 8(b) show a fitting member 11, and Figs. 8(c) to (e) show a driving member 12. A tensile test was carried out to verify the anchoring efficiency of the cable anchor 1 of the embodiment using a high-strength cable laid rope of Φ22 having a load capacity of 304.0 kN. As shown conceptually in Figure 9, the tensile test was carried out by fastening a rope fastener 1 to one end of a wire rope 2, casting the other end with molten alloy into a mold to form a terminal section 3, and then pulling the rope fastener 1 and terminal section 3 provided at both ends by abutting them against a locking die 4. The wire rope 2 itself is loosely fitted into the locking die 4 (it is not fixed to the locking die 4), and the end faces of the rope fastener 1 and terminal section 3 abut against the locking die 4, widening the gap between the locking die 4 to verify the fixing efficiency of the rope fastener 1. 10 and 11 are photographs showing the state of the experiment, with FIG. 10 being a photograph before tension and FIG. 11 being a photograph after tension (after breakage).

[0035] Three wire ropes 2 (Φ22 high strength cable laid ropes) were prepared and the above tensile test was carried out three times. The results are as follows. In all cases, the results were well above 75% of the standard breaking load, which is the target value. 1st time: Breaking load 284.0kN, Fixation efficiency 93.4% 2nd time: Breaking load 275.0kN, fixing efficiency 90.4% 3rd time: Breaking load 255.0kN, fixing efficiency 83.9%

[0036] (Comparative Example) FIG. 12 is a diagram (dimensions in mm) showing a cable anchor 100 as a comparative example. The rope retaining fitting 100 is similar to the rope retaining fitting 1 of the embodiment in that a wedge-shaped member (wedge body 102A, wedge body 102B) and the rope are inserted into a cylindrical fitting member 101, and the rope 2 is restrained by the pressure generated by driving the wedge in. On the other hand, the inclined surface of the wedge only has an inclination component in the driving direction, as in the conventional case. The cable retaining fitting 100 is provided with two stages of wedge bodies, ie, wedge body 102A and wedge body 102B, thereby reducing the striking force required for driving and preventing the fitting from becoming large in size.

[0037] A fastening fitting using a wedge utilizes the tightening force generated by driving in the wedge. That is, the tightening force is obtained by driving in a thicker portion based on the wedge shape. For example, in order to obtain a high tightening force for a relatively flexible rope, it is necessary to drive in a thicker portion. In order to improve this workability, it is possible to increase the inclination angle of the wedge shape. This makes it possible to drive in a thicker portion with a small driving distance. However, in this case, although the driving distance is shortened, the striking force required for driving increases, and the workability may be deteriorated. On the other hand, if the inclination angle of the wedge shape is reduced, the striking force required for driving in is small, but the driving distance required when driving in a thicker portion becomes long. A long driving distance means that the dimensions of the wedge need to be increased, and the fitting becomes long and bulky. In contrast to this, the rope retaining fitting 100 is provided with two stages of wedge bodies, wedge body 102A and wedge body 102B, thereby reducing the striking force required for driving and preventing the fitting from becoming too large.

[0038] A tensile test was carried out on the comparative cable anchor 100 to verify the anchoring efficiency using a high-strength cable laid rope of Φ22 with a load capacity of 304.0 kN. The conditions were the same as those of the tensile test of the embodiment, except that the rope anchor 1 of the embodiment was replaced with the rope anchor 100 of the comparative example (the test was conducted only once). As a result, the breaking load was 280.0 kN and the fixing efficiency was 92.1%.

[0039] The comparative rope fastener 100 is a fitting that has been made compact as described above, but as is clear from a comparison of Figures 8 and 12, the rope fastener 1 of the embodiment is made even smaller. The rope retaining fixture 1 of the embodiment has an ingenious wedge shape that has an inclination component in the width direction in addition to an inclination component in the driving direction, which enables it to obtain a high fastening force.As a result, despite being a smaller fixture, it is able to obtain a fastening force equal to or greater than that of the comparative example (larger fixture). [Explanation of symbols]

[0040] 1...Rope body retaining fixture 11...Fitting parts 12...Driven in parts 12T1...First inclined surface 12T2...Second inclined surface 122...Uneven part θ...The inclination angle of the inclined surface of the wedge-shaped part in the driving direction α...The inclination angle of the inclined surface of the wedge-shaped portion in the width direction

Claims

1. a fitting member having a cylindrical body portion through which the cord is inserted; a driving member having a wedge-shaped portion that is inserted into the cylindrical body portion, contacting the rope body inside the cylindrical body portion and restraining the rope body by pressure generated based on the wedge-shaped portion; Equipped with The inclined surface of the wedge-shaped portion has an inclination about an inclination axis along the driving direction of the driving member, The inclination angle of the inclined surface of the wedge-shaped portion in the driving direction is θ, The inclination angle of the inclined surface of the wedge-shaped portion on the inclination axis is α, A divided component angle of the pushing force for driving the driving member is a relative angle with respect to the driving direction, ψ; When the inclination angle θ is the apparent inclination angle when viewed from a direction along the divided component angle, α 0 , A cable retainer characterized by satisfying the relationship of the following formula 1. [0010]

2. a fitting member having a cylindrical body portion through which the cord is inserted; a driving member having a wedge-shaped portion that is inserted into the cylindrical body portion, contacting the rope body inside the cylindrical body portion and restraining the rope body by pressure generated based on the wedge-shaped portion; Equipped with When the direction in which the driving member is driven is defined as the driving direction, the direction along the thickness of the driving member perpendicular to the driving direction is defined as the thickness direction, and the direction perpendicular to the driving direction and the thickness direction is defined as the width direction, the inclined surface of the wedge-shaped portion has an inclination component in the driving direction and an inclination component in the width direction, The inclination angle of the inclined surface of the wedge-shaped portion in the driving direction is θ, The inclination angle of the inclined surface of the wedge-shaped portion in the width direction is α, A divided component angle of the pushing force for driving the driving member is a relative angle with respect to the driving direction, ψ; When the inclination angle θ is the apparent inclination angle when viewed from a direction along the divided component angle, α 0 , A cable retainer characterized by satisfying the relationship of the following formula 1. [0010]

3. 3. The rope fastening fitting according to claim 1, wherein the driving member has an uneven portion formed at a portion where the driving member abuts against the rope.

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