Cable retention accessories

Abstract

This invention relates to a cable retaining fitting (cable retaining fitting) using a wedge, providing a cable retaining fitting with higher fastening force through a wedge shape not previously available. The cable retaining fitting (1) is characterized by comprising: a fitting member (11) having a cylindrical body portion through which a cable (2) is inserted; and an insertion member (12) having a wedge-shaped portion that inserts into the cylindrical body portion and abuts against the cable (2) within the cylindrical body portion, wherein the inclined surface of the wedge-shaped portion has an inclination along an inclined axis along the insertion direction of the insertion member (12).

Description

Technical Field

[0001] This invention relates to cable retention accessories for retaining cables such as wire ropes. Background Technology

[0002] As an accessory for securing cables such as wire ropes, a wedge-shaped fitting is used. Patent Document 1 discloses a technology related to a fitting (wedge clamp) using such a wedge. The wedge clamp disclosed in Patent Document 1 has excellent workability and can achieve high fixing efficiency, which is excellent. Existing technical documents Patent documents

[0003] Patent Document 1: Japanese Patent No. 6009611 Summary of the Invention The problem that the invention aims to solve

[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 cable, the sliding between the cable and the wedge-shaped component is suppressed, and they enter the restraint component (cylindrical component) as a whole, thereby obtaining a higher fastening force and having excellent fastening force.

[0005] This invention relates to accessories (cable retaining accessories) using wedges as described above, with the aim of providing a cable retaining accessory with higher fastening force through a wedge shape not previously available. Technical solutions for solving the problem

[0006] (Structure 1) A cable retention fitting is characterized by comprising: a fitting member having a cylindrical body portion through which a cable is inserted; and an insertion member having a wedge-shaped portion that inserts into the cylindrical body portion and abuts against the cable within the cylindrical body portion, wherein the inclined surface of the wedge-shaped portion has an inclination along an inclined axis along the insertion direction of the insertion member.

[0007] (Structure 2) A cable retention fitting is characterized by comprising: a fitting member having a cylindrical body portion through which a cable is inserted; and an insertion member having a wedge-shaped portion that inserts into the cylindrical body portion and abuts against the cable within the cylindrical body portion, wherein, when the direction in which the insertion member is inserted is defined as the insertion direction, the direction orthogonal to the insertion direction along the thickness of the insertion member is defined as the thickness direction, and the direction orthogonal to the insertion direction and the thickness direction is defined as the width direction, the inclined surface of the wedge-shaped portion has an inclined component toward the insertion direction and an inclined component toward the width direction.

[0008] (Structure 3) The cable-locking fitting described in Structure 2 is characterized in that, when the inclination angle of the inclined surface of the wedge-shaped portion toward the driving direction is set as θ, the inclination angle of the inclined surface of the wedge-shaped portion toward the width direction is set as α, the angle of the segmented component of the pressing force used to drive the driving component, i.e., the relative angle with respect to the driving direction, is set as ψ, and the apparent inclination angle when the inclination angle θ is viewed from the direction of the segmented component angle is set as α0, it has the following mathematical formula 1 relationship.

[0009]

Mathematical Formula 1

[0010] (Structure 4) The cable retention fitting according to any one of structures 1 to 3 is characterized in that a protrusion and a recess are formed at the part of the inserting member that abuts the cable. Invention Effects

[0011] The cable retaining fitting according to the present invention, through a wedge shape not previously available, can provide a cable retaining fitting with higher fastening force. Attached Figure Description

[0012] Figure 1 This is a diagram showing the fitting component of the cable retention fitting according to an embodiment of the present invention. Figure 2 This is a diagram showing the insertion component of the cable retaining accessory in an embodiment. Figure 3 This is a diagram showing the cable-locking fitting in an embodiment. Figure 4 This is a diagram showing the usage state of the cable-locking accessory in the embodiment. Figure 5 This is an explanatory diagram of the inclined surface of the wedge shape of the cable retaining fitting. Figure 6 This is an explanatory diagram of the inclined surface of the wedge shape of the cable retaining fitting. Figure 7 This is a diagram showing other examples of implanted components. Figure 8 This is a diagram illustrating the cable-locking fitting of an embodiment. Figure 9 This is an explanatory diagram about tensile testing. Figure 10 It is a photograph showing the tensile test. Figure 11 It is a photograph showing the tensile test. Figure 12 This is a diagram showing a comparative example of a cable-locking fitting. Detailed Embodiment

[0013] Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In addition, the following embodiments are one way of embodying the present invention and do not limit the present invention to this scope.

[0014] Figure 1 It is a view showing a fitting part of a cable retaining fitting according to an embodiment of the present invention. Figure 2 It is a view showing a driving-in part. In addition, Figure 3 , 4 It is a view showing a cable retaining fitting (Japanese original text: cable retaining fitting) of the present embodiment. The cable retaining fitting 1 includes: A fitting part 11 having a cylindrical body part through which a cable is inserted; and A driving-in part 12 having a wedge-shaped part inserted into the cylindrical body part of the fitting part 11 and abutting against the cable 2 inside the cylindrical body part, so as to retain the end of the cable 2 such as a wire rope. More specifically, the wedge-shaped part of the driving-in part 12 and the cable 2 are inserted into the cylindrical body part of the fitting part 11, and the driving-in part 12 is driven in, so as to restrain the cable 2 by the pressure generated by the wedge shape of the driving-in part 12. In addition, in the following description, the front side (left side in Figure 3 ) of the driving direction of the driving-in part 12 is called the "front end side", and the opposite direction (right side in Figure 3 ) is called the "rear end side". In addition, the direction along the thickness of the driving-in part 12 orthogonal to the driving direction (vertical direction in <( Figure 3 ) is set as the thickness direction, and the direction orthogonal to the driving direction and the thickness direction (direction orthogonal to the paper surface in Figure 3 ) is set as the width direction. Figure 3 In

[0015] Figure 1 It is a view showing the fitting part 11. Figure 1 (a) of Figure 1 is a top view (viewed from above in the thickness direction), Figure 1 (b) of is a side view (viewed from the width direction), As Figure 1As shown in (c), contact surfaces 113a and 113b are formed on the lower side of the through hole 11H in the thickness direction, which contact the cable body 2 with two surfaces, thus forming a V-groove. The function of the two surfaces of this V-groove in constraining the cable body 2 is the same as that described in Patent Document 1, and detailed explanation is omitted here. Furthermore, regarding the prevention of slippage between the two surfaces of the V-groove and the cable body 2 by setting the angle of the two surfaces to a given angle, as described in Patent Document 1, this is highly preferred, but not essential in the application of this invention. The upper surface (upper side in the thickness direction) inside the through hole 11H has a first inclined surface 11T1, which has a first inclined angle (the angle relative to the bottom surface of the through hole 11H). Additionally, on the rear end side for insertion of the insertion member 12, there is a second inclined surface 11T2, which has a second inclined angle (the angle relative to the bottom surface of the through hole 11H). The second inclined surface 11T2 engages with the second inclined surface 12T2 of the insertion member 12 when it is inserted, as described below. The first inclined surface 11T1 engages with the first inclined surface 12T1 of the insertion member 12 when it is engaged. The second inclined surface 11T2 and the first inclined surface 11T1 each have an inclination corresponding to the inclination of the second inclined surface 12T2 and the first inclined surface 12T1 of the insertion member 12, as described below.

[0016] A thinning portion 111 for weight reduction is formed on the upper surface (upper side in the thickness direction) of the fitting member 11. Figure 1 It can be seen that the thinning portion 111 is formed in a form in which the cutting amount increases when viewed from the side towards the front side. Additionally, engaging portions 112 are formed on both sides (both sides in the width direction) to engage with the clamps used when driving in the inserting member 12. Since these clamps are not directly related to the present invention, a description of them is omitted here.

[0017] Figure 2 This is a diagram showing the insertion of component 12. Figure 2 (a) is a top view. Figure 2 (b) is a side view. Figure 2 (c) is the rear view. The driving component 12 is a component having a wedge shape formed by a first inclined surface 12T1. Furthermore, it has a second inclined surface 12T2 at its front end, with an inclination angle greater than that of the first inclined surface 12T1. The inclination angles of the first inclined surface 12T1 and the second inclined surface 12T2 refer to the relative angles of the first inclined surface 12T1 and the second inclined surface 12T2 with respect to the bottom surface of the driving component 12, i.e., the angles of the wedge shape. The first inclined surface 12T1 (and the second inclined surface 12T2) are formed to have an inclined component in the driving direction and an inclined component in the width direction. In other words, the first inclined surface 12T1 (and the second inclined surface 12T2) has an inclination along the inclined axis in the width direction and an inclination along the inclined axis in the driving direction.

[0018] Figure 3 This is a side view showing the usage state of the cable-stopping accessory 1 (before the insertion component 12 is inserted). Figure 4 This is a rear view showing the usage state of the cable retaining accessory 1 (the state in which the inserting component 12 is inserted). like Figure 3 As shown, with the cable body 2 inserted into the cylindrical part of the fitting member 11, the inserting member 12 is inserted into the cylindrical part, thereby constraining the cable body 2 by the pressure generated based on the wedge shape of the inserting member 12. In the cable retaining accessory 1 of this embodiment, a second inclined surface 12T2 with a larger inclination angle is formed on the front end side of the driving member 12, and a corresponding second inclined surface 11T2 is also formed on the fitting member 11. Therefore, the initial workability of the driving member 12 is excellent.

[0019] Figure 5 This is an explanatory diagram of the inclined surface of the wedge shape of the driven component 12. Figure 5 (a) is a top view of the wedge shape of the driving component 12, and (b) is a diagram showing the tilt angle of the wedge shape in the driving direction. Figure 5 The contents of each symbol in the text are as follows. l: Length of the wedge-shaped drive direction θ: The angle of inclination of the wedge-shaped inclined surface towards the driving direction. α: The angle of inclination of the wedge-shaped inclined surface in the width direction. ψ: The angle of the component of the pressing force used to drive in the component 12, i.e., the relative angle with respect to the driving direction. The maximum fastening force is obtained when ψ = 45°. α0: From the direction along the angle of the segmented component ( Figure 5 The apparent tilt angle when observing the tilt angle θ (direction of A) θ0: From the direction along the angle of another dividing component ( Figure 5 The apparent tilt angle when observing the tilt angle θ (direction of B)

[0020] If based on Figure 5 The relationship related to α is as follows.

[0021]

Mathematical Formula 2

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

[0023]

Mathematical Expression 3

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

[0025] Next, based on Figure 6 The load W (hereinafter referred to as "fastening force W") in the vertical direction that generates a fastening force on the wedge (driving part) when the pressing force F for driving in the wedge is applied is explained. Figure 6 The contents of each symbol in the text are as follows. F: The force required to drive the wedge in. θ: The angle of inclination of the wedge-shaped inclined surface towards the driving direction. N: The resistance generated on the inclined surface of the wedge shape when an indentation force F is applied. P: Horizontal component of resistance N W: The vertical component of the resistance N (fastening force)

[0026] If based on Figure 6 The relationship related to W is as follows.

[0027]

Mathematical Expression 4

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

[0029]

Mathematical Expression 5

[0030] According to the cable retaining fitting 1 of this embodiment, a higher fastening force can be obtained through a wedge shape that is not present in the past. Traditionally, the tilt of a wedge only has a tilt component in the driving direction, that is, it only has a tilt axis along the width direction. In contrast, the cable retaining fitting 1 of this embodiment is formed to have an inclination component in the width direction in addition to an inclination component in the driving direction, that is, it also has an inclination along the inclination axis in the driving direction. By having such an original wedge shape, a higher fastening force can be obtained relative to the pressing force when the wedge is driven in.

[0031] Figure 7 This is a diagram showing other examples of parts that have been installed. Figure 7 The inserting member 12' has a protrusion 122 formed at the part that abuts against the cable body 2. This suppresses the occurrence of slippage between the inserting member 12' and the cable body 2.

[0032] Furthermore, in this embodiment, the fitting member 11 is taken as a cylindrical member, but the present invention is not limited to this. For example, it may also be a quadrangular prism shape with a through hole for inserting a member or cable. Furthermore, in this embodiment, the fitting component is formed entirely into a cylindrical shape, but the present invention is not limited to this. The fitting component only needs to have a cylindrical portion, and the fitting component may also have a structure other than a cylindrical shape. Similarly, in this embodiment, the inserting component is formed entirely into a wedge shape, but the present invention is not limited to this. The inserting component only needs to have a wedge-shaped portion, and the inserting component may also have a structure other than a wedge-shaped portion.

[0033] In this embodiment, the contact surface (V-groove) that contacts the cable body 2 with two surfaces is formed on the side of the fitting member 11, but the V-groove can also be formed at the part of the inserting member that abuts against the cable body 2.

[0034] (Example) Next, the embodiments and the results of the tensile tests used to verify the fixation efficiency will be described. Figure 8 This is a diagram illustrating the cable retaining fitting 1 of the embodiment. The cable retaining fitting of the embodiment is a cable retaining fitting having the structure described in the above embodiments, and is made of S45C (carbon steel). Figure 8 The dimensions shown are formed (in mm). Figure 8 (a) and Figure 8 (b) indicates the fitting component 11. Figure 8 (c) to (e) indicate the insertion of component 12. For cable-laid fitting 1 in the embodiment, a tensile test was conducted to verify the fixing efficiency using a Φ22 high-strength cable-laid rope with a load capacity of 304.0kN. like Figure 9As shown in the conceptual diagram, the tensile test is conducted as follows: A cable retention fitting 1 is fastened to one end of the wire rope 2, while the other end, along with molten alloy, is cast into a mold to form an end portion 3. The cable retention fitting 1 and the end portion 3 at both ends are then brought into contact with a locking mold 4 for tensioning. The wire rope 2 itself is fitted with a gap in the locking mold 4 (not fixed to the locking mold 4), and the end faces of the cable retention fitting 1 and the end portion 3 abut against the locking mold 4. By widening the gap in the locking mold 4, the fixing efficiency of the cable retention fitting 1 is verified. Figure 10 and Figure 11 These are photographs showing the experimental conditions. Figure 10 This is a photo before stretching. Figure 11 It is a photograph showing the result after stretching (or breaking).

[0035] Three steel wire ropes (Φ22 high-strength multi-strand ropes) were prepared, and the results of three tensile tests as described above are as follows. In each test, the standard breaking load, which was considered the target value, was significantly exceeded by 75%. First test: Fracture load 284.0 kN, fixation efficiency 93.4% Second test: Fracture load 275.0 kN, fixation efficiency 90.4% Third test: Fracture load 255.0 kN, fixation efficiency 83.9%

[0036] (Comparative Example) Figure 12 This is a drawing showing the cable retaining fitting 100 as a comparative example (the dimensions are in mm). The cable retaining fitting 100 is similar to the cable retaining fitting 1 of the embodiment in that the wedge-shaped components (wedge 102A, wedge 102B) and the fitting component 101 into which the cable is inserted into the cylindrical body constrain the cable 2 by the pressure generated by driving in the wedge. On the other hand, the inclined surface of the wedge, as in the past, only has an inclined component in the driving direction. The cable-locking accessory 100 reduces the impact force required for penetration and decreases the size of the accessory by incorporating two wedges, wedge 102A and wedge 102B.

[0037] Fastening fittings using wedges utilize the tightening force generated by driving the wedge in. That is, by driving in a thicker section based on the wedge shape, a tightening force is obtained. For example, to obtain a high tightening force on a relatively soft rope, a thicker section needs to be driven in. To improve workability, increasing the wedge's angle of inclination is considered. A thicker section can be driven in with a shorter driving distance. However, in this case, although the driving distance is shorter, the impact force required for driving in increases, resulting in reduced workability. On the other hand, decreasing the wedge's angle of inclination allows for a smaller impact force, but the driving distance required to drive in a thicker section becomes longer. A longer driving distance means a larger wedge size is needed, resulting in a longer and larger fitting. In contrast, the cable-locking accessory 100 reduces the impact force required for penetration and decreases the size of the accessory by having two levels of wedges, wedges 102A and wedges 102B.

[0038] For the comparative example cable retention fitting 100, a tensile test was conducted to verify the fixing efficiency using a Φ22 high-strength multi-strand rope with a load capacity of 304.0kN. Except that the cable retention fitting 100 of the comparative example was used instead of the cable retention fitting 1 of the embodiment, the tensile test conditions were the same as those of the embodiment (the test was conducted only once). As a result, the breaking load was 280.0 kN and the fixation efficiency was 92.1%.

[0039] The comparative example cable retention fitting 100, as described above, is a miniaturized fitting, but according to Figure 8 and Figure 12 As can be seen from the comparison, the cable retention accessory 1 in the embodiment is further miniaturized. The cable retaining fitting 1 of the embodiment has an original wedge shape that has an inclined component in the width direction in addition to the inclined component in the driving direction, thereby obtaining a high fastening force. As a result, it is a smaller fitting, while obtaining a fastening force equal to or greater than that of the comparative example (larger fitting). Symbol Explanation

[0040] 1... Cable-locking accessories 11...Matching components 12... Install components 12T1...First Inclined Surface 12T2...Second Inclined Surface 122...uneven parts θ... The angle of inclination of the inclined surface of the wedge-shaped portion towards the driving direction. α... The angle of inclination of the inclined surface of the wedge-shaped portion in the width direction.

Claims

1. A cable retention fitting, characterized in that, have: The fitting component includes a cylindrical body through which the cable body is inserted; and The insertion component has a wedge-shaped portion that inserts into the cylindrical body portion and abuts against the cable body within the cylindrical body portion. When the direction in which the inserting component is inserted is defined as the inserting direction, the direction orthogonal to the inserting direction along the thickness of the inserting component is defined as the thickness direction, and the direction orthogonal to both the inserting direction and the thickness direction is defined as the width direction, the inclined surface of the wedge-shaped portion has an inclined component towards the inserting direction and an inclined component towards the width direction. Let θ be the angle of inclination of the inclined surface of the wedge-shaped portion toward the driving direction. Let α be the angle of inclination of the inclined surface of the wedge-shaped portion towards the width direction. The angle of the segmented component of the pressing force used to drive into the driving component, that is, the relative angle with respect to the driving direction, is set as ψ. And if the apparent tilt angle when viewing the tilt angle θ along the direction of the segmented component angle is set to α0, It has the following mathematical expression 1 relationship: 【Mathematical Formula 1】 。 2. The cable retention fitting according to claim 1, characterized in that, A protrusion and a recess are formed at the part of the inserting component that abuts against the cable body.

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