JP3461254B2 - Blade rope - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braided rope (fiber rope) wound around a winch or the like and used for lifting heavy objects and the like, and further relates to this rope. To a means for detecting the degree of deterioration of the. 2. Description of the Related Art As a working device provided with a winch for winding a rope, there is known a working device for turning with respect to the body of an aerial work vehicle.
2. Description of the Related Art There is a small crane device that is attached to an upper portion of a vertical post on which a work table for an operator is attached at the end of a boom that can be freely raised, retracted, etc. The rope is wound around the winch of this small crane device, and its tip hangs down through a sheave at the tip of the crane. A hook for hanging the object to be suspended is attached to the tip of the rope. In this small crane device, the object to be lifted can be raised and lowered by operating the winch by hanging the object to be lifted on the hook. [0003] The rope used in this manner includes a blade-type rope (fiber) in which a base line is formed by coating a cylindrical outer layer made of a synthetic resin net on an inner layer line made of a plurality of synthetic resin strands. Rope) is adopted. This type of blade type rope has a thimble as a connecting member to which a hook is connected, and the end of the base line on the hook side is wound around the thimble, and the tip is wound around the base line around the thimble. It is inserted into the outer layer of the part not to be formed, and the periphery is fastened with a yarn (fastening thread). Thereby, the thimble is fixed to the rope so as not to come off. However, in the blade type rope having such a configuration, when the rope is deteriorated, the tightening force of the yarn is reduced. Then, as the tensile load repeatedly acts on the rope, the tip of the inner layer wire shifts in the detaching direction, and when the shift amount becomes a predetermined amount or more, the thimble comes off the rope. For this reason, in the inspection before starting the small crane described above, the deterioration of the rope is checked, and the safety of the work is secured by the inspection before starting. [0005] However, since the above-mentioned inspection before starting work is performed by visually observing the appearance of the rope, the amount of displacement of the inner layer line cannot be quantitatively grasped.
There was a problem that the rope replacement standard was not clear. The present invention has been made in view of such a problem, and an object of the present invention is to provide a blade-type rope capable of quantitatively measuring an amount of displacement of an inner layer line. [0007] In order to achieve the above object, a blade-type rope according to the present invention comprises a thimble as a connecting member and an inner layer wire formed by bundling a plurality of strands. The base line is formed by covering the base line, and at least the end of the inner layer line is wound around the thimble outer periphery and folded and arranged so as to overlap with the base line. The thimble is fastened to the end of the base line. In addition, as a fastening means, specifically, a yarn (fastening thread) is used. [0008] At the tip of the end of the inner layer wire, at least one of the wires constituting the inner layer wire is exposed to the outside of the outer layer by a predetermined length. According to such a configuration,
If the end of the inner layer wire is displaced in the pull-out direction due to the loosening of the fastening part, the exposed length of the wire exposed to the outside of the outer layer becomes shorter by this amount of displacement. The displacement of the line can be measured quantitatively. Preferred embodiments of the present invention will be described below with reference to the drawings. First, an aerial work vehicle provided with a small crane device having the rope of the present invention will be described with reference to FIG. A swivel 2 is provided at the front of the body 1 of the aerial work vehicle. A boom 3 is pivotally supported on the swivel base 2 so as to be able to move up and down.
Is pivotable with respect to the vehicle body 1 with the boom 3 pivotally supported. The boom 3 includes a base boom 3a, an intermediate boom 3
b, a tip boom 3c, and these three-stage booms are telescopically configured to be telescopic. At the tip of the tip boom 3c, there is provided a vertical post 4 which is always held vertically by a leveling mechanism (not shown), and a support arm 5 is attached to the vertical post 4 so as to be horizontally pivotable. I have. At the end of the support arm 5, a worktable 6 for boarding an operator is attached so as to be able to swing (horizontal swing). The worker M who has boarded the worktable 6 can move the boom 3 and the swivel table 6. It can be operated to move to a desired height and perform work. A small crane device 10 is mounted on the upper part of the vertical post 4. This crane device 10
Is a crane swivel 11 pivotally attached to the tip of the vertical post 4, a winch bracket 12 attached to the crane swivel 11 so as to be able to move up and down, and a crane arm 13 supported by the winch bracket 12.
And A winch 14 is provided in the winch bracket 12, and a rope 20 extended from the winch is extended downward (vertically) via a sheave 15 provided at the tip of a crane arm 13. At the end of the rope 20, a member for construction (not shown)
A hook 16 for hanging the like is attached. In the crane apparatus 10 configured as described above, the winch 14 can be operated to lift a construction member or the like hung on the hook 16 from the ground or drop it on the ground. As the above-mentioned rope 20, a blade type rope (fiber rope) is used. Hereinafter, the configuration of the rope 20 will be described with reference to FIGS. 1 to 5. FIG. 1 shows an appearance of the rope 20, FIG. 2 shows a right side view of the rope 20 of FIG. 1, and FIG.
4 shows a cross-sectional view taken along the line IV-IV of FIG. 1, FIG. 5 shows the rope 20 of FIG. 1 in a state where the outer product winding (details will be described later) is not performed, and FIG. Indicates a process of assembling the rope tip. In addition, FIG.
The rear end of the rope is shown rotated 90 degrees about the rope axis. As shown in FIG. 3, the rope 20 is composed of a plurality of synthetic resin strands and a surface-treated inner layer wire 21 and a cylindrical outer layer 22 made of a synthetic resin net. Are covered with a base line. The base wire has one end (hereinafter, referred to as a rear end) connected to the drum of the winch 14 and the other end (hereinafter, referred to as the front end) is connected to the thimble 23 serving as a connecting member with the hook 16. It is wound around and folded, and is arranged so as to overlap the base line, and the overlapped portion is fastened. Thereby, the thimble 23 is fixed at the tip of the rope 20. The thimble 23 is formed by forming a metal into a drum shape, and a hook connection hole 23 a for connecting the hook 16 is provided at the center thereof. The details of the tip configuration of the rope 20 will be described below. First, the winding of the base wire tip around the thimble 23 will be described. As shown in FIG. 6B, at the tip of the base line, the mesh of the outer layer 22 is expanded at the position of 22b, and the inner layer 21 is brought out of the outer layer 22 through the mesh 22b. In the drawings, for the sake of explanation, a gap is shown between them, but they are actually in close contact. The tip of the inner layer wire 21 is inserted into the outer layer 22 through a mesh 22a as shown in FIG. Then, as shown in FIG. 3D, the tip of the inner layer 21 is pushed further into the back, and the tip of the outer layer 22 is inserted into the outer layer 22 through the mesh 22b. With such a configuration, the tip of the inner layer wire 22 is less likely to come off the outer layer 22. Then, as shown in FIG. 3, the thimble 14 is arranged in the ring formed by the base wire tip. The thimble 14 is tightened by further pushing the tip of the inner layer wire 21, and the inner product winding is performed in this state. Thereby, the base wires (the inner layer wires 21) are fastened to each other, and the thimble 14 is fixed to the tip of the rope 20. The inner product winding will be described below. As shown in FIG. 3 to FIG.
In this example, a yarn (thread member) 30 made of a synthetic resin having a small diameter is stabbed (skewed). In this yarn stab,
The yarn 30 is inserted from the needle insertion position 31 shown in FIG.
The needle is sewn so as to form a figure 8 and comes out from the needle leading position 32. This yarn stab is performed at several places, and the needle insertion positions are 31a to 31e shown in FIG.
5 locations. In addition, in 31a to 31d, sewing is performed twice using one yarn 30, and in 31e, sewing is performed once using two yarns. An outer product winding is provided around the inner product winding. Hereinafter, the outer product winding will be described. As shown in FIGS. 3 and 4, the outer product winding is obtained by winding a yarn 40 made of a synthetic resin having a larger diameter around the outer circumference of the inner product winding. The outer product winding is performed with a ligature. The yarn 40 is tied and wound for each winding, and the knot 41 is arranged on a straight line. In FIG. 3, the knot 4
1 is schematically shown by blacking out a circle. This outer product winding is performed in three blocks, and the arrangement of the knot rows in each block is based on the overlapping direction of the inner layer line 21 in FIG. 4 as shown in FIG. Are rotated and shifted by 90 degrees. Such an outer product winding protects the inner inner product winding, and the inner product winding is prevented from being loosened by tightening the outer product winding. The outer product winding is divided into three blocks and ligated. The knot rows formed by the ligatures in each block are shifted by 90 degrees, so that the tightening force by the outer product winding becomes equal. There is an advantage. Further, according to such a configuration, even if the yarn is loosened in any one block, the tightening force can be secured by another block. On the other hand, inside the rope 20,
At the tip of the wire, one of the wires forming the inner layer wire 21
Book wires 21a extend from the end of the inner layer wire 21;
This strand 21 a is woven into the outer layer 22 and is exposed outside the rope 20. The rope 20 constructed as described above is wound around the winch 14 of the crane device 10 at the rear end of the base wire, and hooked into the return connection hole 23a of the thimble 23 at the tip.
Can be used for lifting the above-mentioned construction members and the like. As described above, when a work member or the like is hung on the hook and the winch is operated to lift the work member or the like, when a tensile load acts on the rope 20 via the thimble 23, the inner layer of the rope 20 A force acts on the line 21 in the pull-out direction. With respect to such a force in the pulling-out direction, the leading end of the inner layer wire 21 is restricted by the tightening force of the inner product winding and the outer product winding. When a tensile load acts on the rope 20, the inner layer wire 21 gradually shifts in the pull-out direction. For this reason, in the pre-operation inspection performed before the operation of the crane apparatus 10, the deterioration amount of the rope 20 is checked and the displacement amount of the inner layer line 21 is measured. According to the rope 20 of the present invention, the inner layer wire 21
The wire 21a forming the tip of the wire 21a extends, and the tip of the wire 21a is exposed to the outside of the outer layer 22. Therefore, when the inner layer wire 21 comes off, the exposed length of the portion of the wire 21a exposed to the outside of the outer layer 22 Will be shorter. Therefore, in the pre-operation inspection, the displacement of the inner layer wire 21 can be quantitatively measured by measuring the exposed length of the wire 21a.
The exposed length can be easily measured by counting the number of wires 21a exposed on the surface of the outer layer 22 by knitting the wires 21a into the outer layer 22 as shown in FIG. The exposed portion of the element wire 21a corresponds to the outer layer 22.
The wire 21a is not hindered, and the wire 21a is prevented from being cut by catching the exposed portion on something. Further, if a scale is provided on the outer layer 22, the exposure amount can be measured without using a measure. In addition, the element wire 21a is colored so as to change intermittently in the axial direction, and when the exposure amount becomes equal to or less than a predetermined amount, a warning is made by, for example, changing the color of the exposed portion to red. You may. In this example, the case where the present invention is used in a small winch device provided in an aerial work vehicle has been described. However, the blade type rope of the present invention can be applied to other devices. As described above, in the rope according to the present invention, at least one end of the wire constituting the inner layer wire is exposed outside the outer layer by a predetermined amount. The displacement of the inner layer wire can be quantitatively measured by the change in the exposed length of the wire exposed to the outside.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an appearance of a blade type rope according to an embodiment of the present invention. FIG. 2 is a right side view of the blade type rope of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2; FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a view showing the blade-type rope of FIG. 1 in a state where the outer product winding is not performed; FIG. 6 is a view showing a process of assembling the tip of the rope of FIG. 1; FIG. 7 is a diagram showing a configuration of an aerial work vehicle equipped with a small crane device having a winch for winding a blade-type rope according to an embodiment of the present invention. [Description of Signs] 21 Inner layer wire 21a Element wire 22 Outer layer

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeki Tamura 1015, Yamashita, Ryoji, Ryoji, Ageo City, Saitama Prefecture Inside Aichi Corporation Ageo Plant (72) Inventor Susumu Ogawa 1152, Yamashita, Ryoke, Ryoji, Ageo, Saitama Prefecture No. 10 Aichi Corporation Ageo Factory (56) References Real Opening Sho 57-83199 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) D07B 1/00-9/00 B66D 1/30 B66D 1/54

Claims (1)

(57) [Claim 1] A thimble as a connecting member, and a base line formed by covering an outer layer with an inner layer line formed by bundling a plurality of strands, wherein the base At least the end of the inner layer line of the wire is wound around the outer periphery of the thimble and folded, and is arranged so as to overlap the base line, and the overlapped portion is fastened and the thimble is attached to the end of the base line. And at least one of the strands constituting the inner layer wire is exposed to the outside of the outer layer by a predetermined length at a tip end of the inner layer wire, and the base line Wherein the looseness of the end fastening portion is detected by a change in the exposed length of the strand exposed to the outside of the outer layer.