Wire puller

Abstract

To provide a wire puller having a structure in which a split pin attached to a clevis pin hardly interferes with work.SOLUTION: The wire puller includes a frame, a drum, a wire, a clevis 6, and a clevis pin 70. The drum is rotatably supported by the frame. The wire is fixed to the drum, and is wound around the drum as the drum rotates. The clevis 6 connects the frame to another member. Clevis pin 70 is secured to clevis 6 by a split pin 80. The split pin 80 includes a head portion 81 and a pair of leg portions 82. A groove 75 and a through pin hole 74 are formed in the clevis pin 70. The groove 75 is formed on the outer circumferential surface of the clevis pin 70 in the circumferential direction or the tangential direction. The legs 82 of the split pin 80 pass through the pin holes 74. At least a part of the distal end surface of the leg portion 82 is located inside the groove 75.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a wire tensioner. [Background technology]

[0002] Wire tensioners are used in a variety of tasks, including electrical work, agriculture, etc. The wire tensioner is, for example, placed between a wire gripper that grips the wire to be pulled and a tail wire.

[0003] The wire tensioner has a frame, and a drum is rotatably supported on the frame. The wire is wound around the drum. The wire pulled out from the drum is connected to a wire gripper.

[0004] The frame is provided with a clevis and a clevis pin, to which the tail wire is connected via a hook.

[0005] Patent Document 1 does not involve a wire gripper or a tail wire, but discloses a construction method that uses a combination of a wire tensioner and a U-clevis, for example, in construction work to replace components of a transmission tower. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-246873 Summary of the Invention [Problem to be solved by the invention]

[0007] The clevis pin of a wire tensioner is fixed with, for example, a split pin to prevent it from slipping out of the clevis. When working on various types of construction (such as electrical wiring), workers wear gloves, but sometimes the gloves get caught on the tip of the leg of the split pin, reducing work efficiency.

[0008] The present invention has been made in view of the above circumstances, and its object is to provide a wire tensioner in which the split pin does not interfere with the work.

[0009] The problem to be solved by the present invention is as described above. Next, the means for solving this problem and the effects thereof will be explained.

[0010] According to an aspect of the present invention, there is provided a wire tensioner having the following configuration. That is, the wire tensioner comprises a frame, a drum, a linear member, a clevis, and a clevis pin. The drum is rotatably supported on the frame. The linear member is fixed to the drum and is wound onto the drum as the drum rotates. The clevis connects the frame to another member. The clevis pin is fixed to the clevis by a split pin. The split pin comprises a head and a pair of legs. The clevis pin has a groove and a through-hole formed in it. The groove is formed in the circumferential or tangential direction on the outer peripheral surface of the clevis pin. The leg of the split pin passes through the pin hole, and at least a portion of the tip surface of the leg is located inside the groove.

[0011] This prevents the tip of the leg of the split pin from protruding too far from the clevis pin, preventing gloves or other items worn by the worker from getting caught on the leg.

[0012] In the wire tensioner, the groove is preferably formed in a ring shape around the entire outer periphery of the clevis pin.

[0013] This allows the legs to be wrapped compactly around the outer circumferential surface of the clevis pin, making it less likely that the legs will protrude beyond the outer circumferential surface of the clevis pin.

[0014] In the wire tensioner, it is preferable that at least one of the two openings formed by the pin hole on the outer peripheral surface of the clevis pin is positioned on the inner wall of the groove.

[0015] This allows the legs of the split pin to be wrapped compactly along the groove.

[0016] The wire tensioner preferably has the following configuration: the groove is formed in the circumferential direction on the outer peripheral surface of the clevis pin, and each of the legs is bent at an angle greater than 90° within the groove.

[0017] This allows the tips of the legs to be positioned close to the head, making it difficult for the worker's gloves or the like to come into contact with the tips of the legs, thereby preventing snagging.

[0018] In the wire tensioner, it is preferable that only a portion of the leg is located inside the groove, and the remainder protrudes from the groove.

[0019] This allows the split pin to be effectively prevented from coming off.

[0020] In the wire tensioner, it is preferable that the groove has an arc-shaped profile in a cross section of the clevis pin cut along a plane parallel to the axial direction.

[0021] This allows the legs of the split pin to be fitted well along the inner wall of the groove when the inner peripheral side where the legs are wound around the clevis pin has an arc-shaped section. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a perspective view showing the overall configuration of a wire tensioner according to an embodiment of the present invention; [Figure 2] FIG. 10 is a perspective view illustrating the process of attaching a clevis pin to a clevis. [Figure 3] FIG. 10 is a perspective view illustrating the operation of fixing the split pin to the clevis pin. [Figure 4] FIG. 10 is a cross-sectional view showing the placement of the legs of the cotter pin relative to the grooves of the clevis pin. [Figure 5] FIG. [Figure 6] AA cross section of the clevis pin shown in Figure 2. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 10 is a cross-sectional view showing a third modified example. DETAILED DESCRIPTION OF THE INVENTION

[0023] Next, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing the overall configuration of a wire tensioner 1 according to one embodiment of the present invention. Fig. 2 is a perspective view illustrating the process of attaching a clevis pin 70 to a clevis 6. Fig. 3 is a perspective view illustrating the process of fixing a cotter pin 80 to the clevis pin 70. Fig. 4 is a cross-sectional view showing the arrangement of the leg 82 of the cotter pin 80 relative to the groove 75 of the clevis pin 70.

[0024] The wire tensioner 1 of this embodiment shown in FIG. 1 can wind a wire (linear member) 30 onto a drum 10.

[0025] The wire tensioner 1 comprises a frame 2, a handle 9, a drum 10, a clevis 6, and a clevis pin 70.

[0026] The frame 2 includes two base plates 3 and 4. Each of the base plates 3 and 4 is a plate-shaped member. The two base plates 3 and 4 are disposed with an appropriate gap between them in the thickness direction.

[0027] A clevis 6 is supported at the end of the frame 2. The clevis 6 has a bifurcated tip, and the tips are connected via a clevis pin 70. For example, by hanging a hook on the clevis pin 70, the frame 2 of the wire tensioner 1 can be connected to another member (for example, a tail wire).

[0028] The drum 10 is rotatably supported between the base plates 3 and 4. To the drum 10, an end of a wire 30 is fixed.

[0029] The wire 30 is flexible. The configuration of the wire 30 is arbitrary, but in this embodiment, a metal wire is used. A known wire gripper (not shown) is attached to the wire 30, for example, via a pulley. The wire gripper can grip and fix a target member to which tension is to be applied by the wire tensioner 1.

[0030] By rotating the drum 10 in the direction of arrow A relative to the frame 2, the wire 30 can be pulled and wound around the outer periphery of the drum 10. By rotating the drum 10 in the direction B opposite to direction A, the wire 30 can be unwound from the drum 10.

[0031] Although not shown, the shaft of the drum 10 extends so as to penetrate the base plate 3. An input gear 11 and an input wheel 15 are fixed to this shaft. The input gear 11 and the input wheel 15 rotate integrally with the drum 10.

[0032] The handle 9 is a long, thin rod-like member. The handle 9 is supported so as to be rotatable around the rotation axis of the drum 10. The handle 9 is rotatable relative to the input gear 11. The base of the handle 9 is formed hollow, and the input gear 11 is disposed inside it.

[0033] A ratchet pawl 12 is disposed on the handle 9. The ratchet pawl 12 can mesh with teeth formed on the outer periphery of the input gear 11. When the handle 9 is rotated to one side, the ratchet pawl 12 is in an engaged state, and transmits the rotation of the handle 9 to the input gear 11. On the other hand, when the handle 9 is rotated to the opposite side, the ratchet pawl 12 is in a disengaged state, and the rotation of the handle 9 is not transmitted to the input gear 11. By alternately rotating the handle 9 back and forth in the P direction, the Q direction, the P direction, the Q direction, and so on, the input gear 11 can be rotated intermittently to one side.

[0034] The ratchet pawl 12 is provided with a knob (not shown). By operating the knob, an operator can switch between the direction P and the direction Q in which the ratchet pawl 12 is engaged when the handle 9 is rotated.

[0035] The wire tensioner 1 is equipped with a locking mechanism (reverse rotation prevention mechanism) 16. The locking mechanism 16 is configured as, for example, a ratchet mechanism. The locking mechanism 16 allows the drum 10 to rotate in direction A relative to the frame 2, but prevents it from rotating in direction B. The locking mechanism 16 can prevent the drum 10 from rotating in direction B, which unwinds the wire 30, even if tension in the wire 30 is applied to the drum 10.

[0036] The locking mechanism 16 includes a regulating gear 7 and a locking member 8. The regulating gear 7 is fixed to the drum 10 and rotates integrally therewith. The locking member 8 is rotatably supported by the frame 2 via a first support shaft 46. The center of the first support shaft 46 extends in the thickness direction of the base plates 3 and 4. The locking member 8 has a pawl that can mesh with the outer teeth of the regulating gear 7. A spring (not shown) applies an elastic force to the locking member 8 in a direction that causes the pawl to mesh with the regulating gear 7. This automatically achieves a locked state in which the pawl meshes with the regulating gear 7, preventing rotation of the drum 10 in direction B. Because the outer teeth of the regulating gear 7 are serrated, the pawl of the locking member 8 can overcome the outer periphery of the regulating gear 7 when the drum 10 attempts to rotate in direction A.

[0037] When it is necessary to rotate the drum 10 in direction B, the worker manually pushes the locking member 8 in a direction against the force of the spring to rotate it. This releases the engagement between the pawl and the regulating gear 7.

[0038] A U-shaped rotary member 5 is disposed on the frame 2. The rotary member 5 is disposed between the base plates 3 and 4, and is rotatably supported via the first support shaft 46 described above.

[0039] The rotating member 5 includes a swing base 50 , a first plate arm 51 , and a second plate arm 52 .

[0040] The swing base 50 is formed in a plate shape. A second support shaft 47 is disposed so as to penetrate the swing base 50. The first plate arm 51 and the second plate arm 52 extend in a direction perpendicular to the swing base 50. A first support shaft 46 is disposed so as to penetrate the tip ends of the first plate arm 51 and the second plate arm 52.

[0041] The clevis 6 is rotatably connected to the rotary member 5 via a second support shaft 47. The second support shaft 47 extends perpendicular to the first support shaft .

[0042] The clevis 6 includes a connection base 60 , a first arm 61 , and a second arm 62 .

[0043] The connecting base 60 is formed in a plate shape. The connecting base 60 is rotatably connected to the swing base 50 provided in the rotating member 5 via a second support shaft 47.

[0044] The first arm 61 and the second arm 62 extend perpendicularly to the connecting base 60. A clevis pin 70 is fixed to pass through the tip ends of the first arm 61 and the second arm 62.

[0045] The clevis pin 70 includes a shaft portion 71, a head portion 72, and a split pin mounting portion 73.

[0046] The shaft portion 71 is formed in a round bar shape and is inserted into through holes formed in the first arm 61 and the second arm 62.

[0047] The head 72 is formed at one end of the shaft 71. The head 72 is hexagonal, similar to the head of a known bolt.

[0048] The split pin mounting portion 73 is located at the end of the shaft portion 71 opposite the head portion 72. A linear pin hole 74 for mounting a split pin 80 is formed through the split pin mounting portion 73. Fixing the split pin 80 to the split pin mounting portion 73 prevents the clevis pin 70 from coming out of the clevis 6.

[0049] The split pin 80 has a known structure including a head portion 81 and a pair of legs 82. The split pin 80 is made of, for example, metal.

[0050] The head 81 is formed in an arc shape with an angle close to 360°. The head 81 cannot pass through the pin hole 74 described above.

[0051] Each of the pair of legs 82 is connected to an end of the head 81. Before deformation, the two legs 82 extend in parallel straight lines and are arranged adjacent to each other. In this state, the two legs 82 can pass through the pin holes 74.

[0052] When fixing the split pin 80 to the split pin mounting portion 73, as shown in Figure 2, the two legs 82 are inserted into the pin hole 74 from the end opposite the head 81. Next, as shown in Figure 3, the portions of the two legs 82 that protrude from the pin hole 74 are bent away from each other and arranged so as to wrap around the outer periphery of the split pin mounting portion 73. The two legs 82 are wound around the split pin mounting portion 73 in opposite directions. For the sake of simplicity of the drawings, the frame 2 and rotating member 5 of the wire tensioner 1 are omitted from Figures 2 and 3, etc.

[0053] In the split pin mounting portion 73, a long, narrow groove 75 is formed in the circumferential direction on the outer periphery of the shaft portion 71. When the leg portion 82 of the split pin 80 is wound around the outer periphery of the shaft portion 71, at least a part of the tip can be accommodated in this groove 75, as shown in FIG.

[0054] At least a portion of the tip surface of the leg portion 82 of the split pin 80 is inserted into the groove 75, making it difficult for the leg portion 82 to protrude from the split pin mounting portion 73. FIG. 5 shows a comparative example in which the groove 75 is omitted. In this comparative example, the leg portion 82 (particularly the tip portion, which is difficult to bend plastically) is easily separated from the outer peripheral surface of the shank 71. In contrast, in this embodiment, as shown in FIG. 5, a portion (the innermost portion) of the tip surface of the leg portion 82 is located inside the groove 75. This reduces the distance by which the tip of the leg portion 82 protrudes from the outer peripheral surface of the shank 71. This prevents the leg portion 82 from getting caught on the worker's gloves or the like, hindering the work.

[0055] In this embodiment, the groove 75 is formed to be elongated in the circumferential direction. Therefore, the bending direction of the leg portion 82 is guided by the groove 75, so that the split pin 80 can be deformed in an orderly manner.

[0056] Figure 6 shows a cross section of the clevis pin 70 taken along a plane parallel to the axis. As shown in Figure 6, the cross section of the groove 75 is arc-shaped. This makes it difficult for the gap between the leg 82 and the groove 75 to become large when using a split pin 80 whose leg 82 has a substantially semicircular cross section. This prevents gloves or the like from becoming caught between the groove 75 and the leg 82.

[0057] 4 and other figures, groove 75 is formed in a ring shape around the entire outer periphery of shaft 71 so as to connect to both openings of through-shaped pin hole 74. This results in a symmetrical configuration in which leg 82 can be inserted through either of the two openings of pin hole 74, which improves operability.

[0058] As described above, the wire tensioner 1 of this embodiment includes a frame 2, a drum 10, a wire 30, a clevis 6, and a clevis pin 70. The drum 10 is rotatably supported by the frame 2. The wire 30 is fixed to the drum 10 and is wound onto the drum 10 as the drum 10 rotates. The clevis 6 connects the frame 2 to another member. The clevis pin 70 is fixed to the clevis 6 by a split pin 80. The split pin 80 includes a head 81 and a pair of legs 82. The clevis pin 70 is formed with a groove 75 and a through-shaped pin hole 74. The groove 75 is formed in the outer peripheral surface of the clevis pin 70 in the circumferential or tangential direction. The legs 82 of the split pin 80 pass through the pin hole 74, and at least a portion of the tip surface of at least one of the pair of legs 82 is located inside the groove 75.

[0059] This prevents a worker working around the clevis pin 70 from having his / her gloves or the like caught on the leg portion 82 of the split pin 80, which would cause an impediment to the work.

[0060] In the wire tensioner 1 of this embodiment, the groove 75 is formed in a ring shape around the entire outer periphery of the clevis pin 70.

[0061] This allows the legs 82 to be wrapped compactly around the outer circumferential surface of the clevis pin 70. As a result, the legs 82 are less likely to protrude from the outer circumferential surface of the clevis pin 70.

[0062] In the wire tensioner 1 of this embodiment, both of the two openings formed by the pin hole 74 on the outer circumferential surface of the clevis pin 70 are arranged on the inner circumferential surface of the groove 75.

[0063] This allows the leg portion 82 to be bent compactly at the connection portion between the pin hole 74 and the groove 75.

[0064] In the wire tensioner 1 of this embodiment, the grooves 75 are formed in the circumferential direction on the outer peripheral surface of the clevis pin 70. Each leg 82 is wound around the clevis pin 70 along the grooves 75 at an angle greater than 90° (α>90°).

[0065] As a result, the tips of the bent leg parts 82 are positioned close to the head part 81. The head part 81 prevents the glove from approaching the tips of the leg parts 82, preventing the glove from getting caught on the leg parts 82.

[0066] In the wire tensioner 1 of this embodiment, only a portion of the leg 82 is located inside the groove 75 , and the remainder protrudes from the groove 75 .

[0067] This ensures that the split pin 80 can be prevented from coming off.

[0068] In the wire tensioner 1 of this embodiment, the groove 75 has an arc-shaped contour in a cross section of the clevis pin 70 cut along a plane parallel to the axial direction.

[0069] This makes it possible to reduce the distance between the groove 75 and the leg 82 when using a split pin 80 in which the cross section of the leg 82 is arc-shaped. This prevents the glove from getting caught on the tip of the leg 82.

[0070] The preferred embodiment of the present invention has been described above, but the above configuration can be modified, for example, as follows. Each modification may be made alone, or multiple modifications may be made in any combination.

[0071] 7, the angle α at which leg portion 82 is wound may be 90° or less. Also, groove 75 may be formed in an arc shape rather than in a ring shape that covers the entire circumference of shaft portion 71. In this modification, the side of the two openings of pin hole 74 where head 81 of split pin 80 is located is not located on the inner wall of groove 75.

[0072] As shown in the second modified example in Fig. 8, the groove 75 may not be arc-shaped, but may be formed linearly in the direction of a tangent to the outer peripheral surface of the shaft portion 71. In this configuration, the portion of the leg portion 82 that enters the groove 75 is arranged linearly along the groove 75. In this modified example, neither of the two openings of the pin hole 74 is located on the inner wall of the groove 75.

[0073] 9, a ring-shaped groove 75 is formed eccentrically with respect to the center of the shaft portion 71. The depth of the groove 75 increases toward the head 81 of the split pin 80. The entire tip surface of the leg portion 82 is located inside the groove 75.

[0074] The cross-sectional contour of the groove 75 may be rectangular, V-shaped, or the like, instead of being arc-shaped as shown in FIG.

[0075] The tip surface of only one of the pair of legs 82 may be arranged so that it is partially or entirely within the groove 75 .

[0076] The wire tensioner 1 is not limited to applications in electrical wiring and agriculture, but can also be applied to various other tasks. [Explanation of symbols]

[0077] 1 wire tensioner 2 frames 6 Clevis 10 drums 30 Wire (linear member) 70 Clevis Pin 72 Head 74 pinholes 75 Groove 80 Cotter pin 81 Head 82 Legs

Claims

1. The frame and a drum rotatably supported by the frame; a linear member fixed to the drum and wound onto the drum as the drum rotates; a clevis for connecting the frame to another member; a clevis pin secured to the clevis by a split pin; Equipped with The split pin has a head and a pair of legs, The clevis pin has a groove and a through-hole formed therein. The groove is formed in a circumferential or tangential direction on the outer peripheral surface of the clevis pin, A wire tensioner characterized in that the leg of the split pin passes through the pin hole and at least a portion of the tip surface of the leg is located inside the groove.

2. The wire tensioner according to claim 1, A wire tensioner characterized in that the groove is formed in a ring shape around the entire outer circumference of the clevis pin.

3. The wire tensioner according to claim 1, A wire tensioner characterized in that at least one of the two openings formed by the pin hole on the outer peripheral surface of the clevis pin is positioned on the inner wall of the groove.

4. The wire tensioner according to claim 1, The groove is formed in the circumferential direction on the outer peripheral surface of the clevis pin, A wire tensioner, characterized in that each of the legs is bent at an angle greater than 90° within the groove.

5. The wire tensioner according to claim 1, A wire tensioner characterized in that only a portion of the leg is located inside the groove, and the remainder protrudes from the groove.

6. The wire tensioner according to claim 1, A wire tensioner characterized in that, in a cross section of the clevis pin cut along a plane parallel to the axial direction, the groove has an arc-shaped contour.

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