JP2883979B2 - Hanging hook - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hanging hook suitable for hanging a sling rope.

[0002]

2. Description of the Related Art As shown in FIG. 4, a hanging hook generally used has a horizontal hanging portion 3 having a relatively large curvature, and a horizontal cross section at an arbitrary position in the longitudinal direction f1 of the horizontal hanging portion 3. The curvature of the shoulder portion n of the contact point 3a, which is the area where the sling rope 8 is in contact with the upper edge, becomes a sharp drop at the peripheral edge above the contact point 3a.
The shape of “a” changes so as to gradually increase from the hook tip 4 toward the vertical main support 2.

On the other hand, the sling rope 8 is used for lifting a load with a hanging hook, and has a structure as shown in FIG. 3A. This rope is generally made of a band-like cloth woven with chemical fiber wefts and warps, and has ring portions 8a formed at both ends.

[0004] When lifting the load using the sling rope 8, for example, as shown in FIG.
A plurality of wires 11 are hung down from both ends, and a hanging hook 12 is fixed to the tip of the wire. Then, the respective ring portions 8 a of the sling ropes 8, which are hung around the hanging load w, are hung on the respective hanging hooks 12.

[0005]

In the state where the sling ropes 8 and 8 are hung on the hanging hooks 12 and the suspended load w is hung, the ring portions 8a of the sling ropes 8 are connected to the hanging hooks 12 as shown in FIG. Due to the large curvature of the horizontal hanging portion 3 in the inner peripheral portion, both ends n1 and n1 are extended more vertically than the central portion.

Further, the contact point 3a of the horizontal hanging portion 3
Is gradually increased toward the vertical main support portion 3, so that the vertical main support portion 2 side of the ring portion 8a tends to be extended more. Due to these facts, a non-uniform longitudinal tensile force acts on the sling rope 8 at a widthwise portion of the ring portion 8a.

Further, the ring portion 8a is provided with a horizontal hanging portion 3.
Are excessively sharply bent at the shoulders n1 and n1. Under these circumstances, the sling rope 8 is quickly damaged by the warp fibers forming both ends in the width direction of the portion that comes into contact with the hanging hook 12, and the fiber at that portion is cut first, and finally the entire portion is broken. You.

In particular, in recent years, sling ropes having increased strength using high-tensile aramid fibers for the warp and nylon fibers for the weft have emerged. They are particularly susceptible to breaking and tend to break before reaching their breaking strength.

An object of the present invention is to provide a hanging hook which can solve such a situation.

[0010]

In order to achieve the above object, according to the present invention, a longitudinal section of a portion where a sling rope comes into contact is formed into a semicircular arc, and a fixed width dimension with which the sling rope comes into contact. Of the horizontal line is slightly depressed at the center of the horizontal line, and the vertical section is formed in the shape of a flat plate bottom.

In the present invention, forming the longitudinal section of the rope contact point into a semicircular arc does not cause excessive bending of the sling rope hooked at the rope contact point, In addition, a uniform elastic elongation is generated in the ring portion of the sling rope hooked at the location. Further, the ring portion hooked on the rope contacting portion is easily positioned at the center of the portion by the load acting on the ring portion.

The above-described invention is specifically as follows.
That is, the size of the recess at the center where the sling rope width comes into contact is set to a range of about 2.5% of the length of the ring portion of the sling rope. This makes it easier for the ring portion of the sling rope hung at the rope contact point to be located at the center of the sling rope due to the load acting on the ring portion, and that the entire warp fiber of the sling rope is efficiently used. This contributes to lifting of the suspended load.

[0013] The lower surface of the portion where the sling rope comes into contact is formed into a semicircular arc, and the lower surface is formed with protruding reinforcing ribs, so that the entire vertical cross section has a mushroom shape. This makes it possible to provide a light hanging hook that is excellent in strength with a small amount of material.

[0014]

FIG. 1 is a side view of a hanging hook according to the present invention, and FIG. 2 is a partial view showing an upper part of a ring portion of a sling rope.

The hanging hook of the present invention comprises a hook base end 1,
It has a vertical main support portion 2, a horizontal hanging portion 3, and a hook tip 4. And hook base end 1
Has a suspension ring 5 rotatably fitted thereto.

The horizontal hanging portion 3 is constructed as follows. That is, in the entire length range of the portion where the sling rope comes into contact, the range in which the sling rope 8 is in contact with the upper edge of the cross section at an arbitrary position in the longitudinal direction f1, that is, the sling rope width is in contact. The cross-sectional shape of the portion 3a is the same.

The above is based on the shape k of the longitudinal section indicated by the imaginary line.
There is than the same semicircular arc in a range of S _5, and in the rope contact surface in the longitudinal sectional is a portion indicated by oblique hatching.

At this time, the arc has a curvature radius of, for example, 25 m.
m to about 30 mm, and are continuous at the same curvature over the entire sling rope contact point 3a.

The contact point 3a of the sling rope is bent into a flat bottom shape in which the center of the horizontal line H in the longitudinal direction f1 is slightly recessed downward. The degree of this bending is such that the downward displacement amount s6 at the central portion is about 2.0 to 2.5% of the length of the ring portion 8a of the sling rope 8 hooked here.

The reason is as follows. In the present invention, the high tension aramid fiber is used for the warp of the sling rope, and the breaking elongation of the high tension aramid fiber is 4.6%. Therefore, the weight of the material to be lifted is
That is, the warp is uniformly applied to all the warps. In this case, the ring portion 8a can support the load with the strength of all the high-tensile aramid fibers.

In the present invention, from this point of view, it is preferable that the rope contact point 3a is formed in a horizontal line (H in FIG. 1), but the sling rope 8 hung on this portion has a width dimension. Regardless of the size of the hook, the hook is automatically slid to the center of the hanging hook to form a stable hanging state, so that the center of the hanging hook is formed into a flat bottom shape with a slight recess.

The amount of downward displacement s6 at the center of the hook is about 2.0% of the length of the ring portion 8a of the sling rope 8, considering that the elongation of the high tension aramid fiber is 4.6%. % To 2.5%.

The reason why the lower limit of the displacement amount s6 is set to about 2.0% is that a sufficient effect cannot be obtained on the above-mentioned sliding movement of the sling rope to the stable hook center of gravity. Further, setting the upper limit to about 2.5% is based on the fact that the safety level is set to double. Note that the downward displacement s
The reason why the length of the ring portion 8a of the sling rope 8 was used as a reference in the determination of 6 is that the base end p (see FIGS. 3 and 4) of the ring portion 8a was sewn firmly in its width direction, Even if a tensile force acts on the entire rope 8 by using the rope 8, it is considered that the warp does not vary in the longitudinal position of the warp at each position in the width direction of the base end p and the weft elongates only in the ring portion 8a. Because.

In the present invention, the reinforcing rib 3b is formed so as to protrude below a portion where the sling rope comes into contact with the sling rope and is formed in a semicircular arc so that the entire vertical cross section has a mushroom shape. It is. Such a product as a whole is lightweight and easy to handle, and can provide a product having excellent strength.

The above-mentioned hanging hook is used, for example, in place of the hanging hook 12 shown in FIG. 3B. During use, the ring portion 8a of the sling rope 8 hooked on the rope contact point 3a is pulled. Then, the weft and the weft are stretched appropriately, and the bent portion comes into close contact with the rope contact portion 3a.

In this state, the upper fabric of the ring portion 8a becomes as shown in FIG. 2, and the weft 6 which has been a straight straight line when no tensile force is applied is extended in a curved shape as shown by a virtual line k2. This causes a difference in elongation in the warp 7 at each position in the width direction.

At this time, each warp 7 in the width direction of the ring portion 8a
Is related to a change in the height of the rope contact point 3a in the longitudinal direction f1, and is limited to about 2.5% at the maximum. k3 indicates the cross-sectional shape of the vertical main support portion 2, and the extension e of the reinforcing rib 3b is formed behind it.

The dimensions of each part in the case where the present invention is embodied for a lifting load of 5 tons are as follows.

That is, the dimension s1 from the lowermost part to the suspension ring 5
Is about 190 mm, the total width s2 is about 170 mm, the height s3 at the center of the length of the horizontal hanging part 3 is about 55 mm, the height s4 of the vertical main support part 2 is about 60 mm, and the length s5 of the rope contact surface part m. Is about 65 mm, and the displacement s6 at the center of the rope contact surface part m (determined with the length of the ring part of the used sling rope being 30 cm) is about 7 m.
m, and the height s7 of the inner peripheral portion is approximately 75 mm.

[0030]

According to the present invention described above, the warp fibers at each position in the width direction of the sling rope used by being hung on the horizontal hanging portion are stretched without large variation, and the warp fibers come into contact with the hanging hook. The conventional situation that the warp fibers forming the both ends in the width direction of the ring part are quickly damaged is eliminated, and it can be used for a wide variety of sling ropes, and the limited lifting capacity of the used sling ropes is reduced. On the other hand, a relatively large weight can be safely lifted.

According to the second aspect, in addition to the fact that the ring portion of the sling rope to which the hanging load has been applied is easily located at the center of the rope contact point, a high-tensile aramid fiber is used for the warp fiber. Even a sling rope as a whole can efficiently contribute to lifting of a suspended load, and can safely lift a heavy suspended load. According to the third aspect, it is lightweight and easy to handle as a whole,
And it can be set as the product excellent in intensity | strength.

[Brief description of the drawings]

FIG. 1 is a side view of a hanging hook according to the present invention.

FIG. 2 is a partial view showing a ring portion of a sling rope hooked on the hook.

3A is a diagram showing a sling rope, and FIG. 3B is a diagram showing an example of its use.

4A and 4B show an example of use of a conventional hanging hook, in which A is a side view, and B is a longitudinal sectional view of a horizontal hanging portion at a longitudinal center position.

[Explanation of symbols]

 2 Vertical main support part 3 Horizontal suspension part 3a Rope contact point 3b Reinforcing rib 4 Hook tip part 8 Sling rope 8a Ring part f1 Longitudinal direction s6 Displacement

Claims (3)

(57) [Claims] 1. A longitudinal section of a portion where a sling rope comes into contact is formed in a semicircular arc, and a center portion of a horizontal line is slightly depressed in a range of a constant width dimension where the sling rope contacts. Is formed in the shape of a bottom plate. 2. The size of the recess at the center where the sling rope width contacts is approximately 2.5 times the length of the ring portion of the sling rope.
2. The hanging hook according to claim 1, wherein the ratio is in the range of%. 3. A mushroom-shaped entire longitudinal section, wherein a reinforcing rib is formed to project from a lower surface portion in which a longitudinal section with which the sling rope comes into contact is formed into a semicircular arc. 3. The hanging hook according to 1 or 2.