JPH0318736Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a structure of a shackle in a clamp, and more particularly to a structure of a shackle in which the shackle rotates following changes in the direction of a tensile force acting on the shackle.

BACKGROUND ART Conventionally, various types of structures for following rotation of a shaft in a clamp are known.

In a first typical example, the shackle is pivoted in one axis with respect to the clamp body, so that the shackle can be pivoted about said axis within a limited range of angles with respect to the clamp body.

In a second typical example, the shackle and the clamp body include a first member pivotably connected to the first member for rotation over a limited angular range about a first axis; and a second member pivotably mounted to be rotatable within a limited angular range around a second axis disposed in a direction perpendicular to the first pivot axis. The shackle can be rotated about two axes perpendicular to the clamp body, respectively.

Problems to be Solved by the Invention However, in the first typical example, the shackle follows the tensile force in a plane perpendicular to the pivot axis of the shackle, but in a plane that intersects with that plane. When a tensile force is applied along the shaft, a tensile force is applied diagonally or unevenly to the eye hole of the shaft, and the shaft, pivot shaft,
There is a risk that an excessive load will be applied to the support part of the pivot shaft in the clamp body, and the related parts will break.

In the second typical example above, the shackle follows tensile forces in two planes perpendicular to the two pivot axes, but a tensile force is applied along a plane that intersects these planes. In some cases, a diagonal or uneven tensile force is applied to the eye hole of the shaft, and an excessive load is applied to the shaft, the pivot shaft, and the support of the pivot shaft in the clamp body, causing the related parts to become damaged. There is a risk of it breaking.

Attempting to avoid their breakage increases the volume of these parts and therefore also their weight.

Further, the conventional shaft connected by two shafts has a large number of parts and is troublesome to assemble.

Means for Solving the Problem The object of the present invention is to provide a shackle structure in which the shackle follows tensile forces in all directions, and therefore, the tensile force is always applied to the shackle in a constant direction. It is to be.

Another object of the invention is to provide a structure for the shackle in the clamp that has a small number of parts and is therefore easy to assemble.

Yet another object of the invention is to provide a robust, lightweight shackle construction in a clamp.

According to the invention, the shackle includes a first member;
It consists of a second member.

The first member includes a pair of legs of the clamp body;
The clamp body is rotatably supported in a through hole having a circular cross section extending from the inside of the slot toward the outside of the clamp body on the central plane of the clamp body passing through the base connecting one end of the clamp body; It is a generally cylindrical member having a pin hole with a central axis oriented in a direction perpendicular to the axis of the through hole. 1st above
The member is restrained within the through hole by a restraining means.

The second member has one end pivotally attached to the pin hole of the first member and has an eye hole at the other end having an axis perpendicular to the axis of the first member.

Operation The first member is thus able to freely rotate about its axis relative to the clamp body. The second member is rotatable about the axle pin over a limited angular range with respect to the first member.

The combination of these movements allows the shackle to pivot in virtually any direction relative to the clamp body.

The above-described arrangement provides a robust shackle structure with a small number of parts and therefore without increasing the weight of the clamp. 1st and 2nd
The connection of the members by means of axle pins is the same as in conventional construction and therefore does not add weight.

The first member can freely rotate about its axis, and since the second member is pivotally connected to the first member with an axis pin, the shaft will not move even if a tensile force is applied from any direction. The tensile force is always applied to a certain part, and therefore, the object of the invention can be achieved by providing the shackle with a geometry that is robust against the tensile force applied to that part.

Embodiment FIG. 1 is a side view of a clamp equipped with a shackle according to a preferred embodiment of the present invention;
The figure is a sectional view taken along line 2-2 in FIG. 1.

The clamp body 10 has a pair of legs 11 forming a slot for receiving the article to be lifted.
and a base 12 joining their ends.

Although each of the pair of legs 11 may be provided with a suitable jaw, the lower leg in FIG.
It is shown as having a conventional pivoting jaw 20 with a threaded rod. In FIG. 1, the upper leg is formed with a through hole 31 having a circular cross section, a generally cylindrical portion 41 rotatably inserted into the through hole, and a generally cylindrical portion 41 at the lower end in FIG. A rotary jaw 40 having a disc-shaped gripping portion 42 is attached to a set screw 4.
It is shown as being locked by 3. A groove 41a is formed in the cylindrical portion 41, and the tip of the set screw fits into the groove 41a.
Rotating jaw 40 is rotatably held within the bore.

The shackle S includes a first member 50 and a second member 60. In this embodiment, the first member 50 has a large diameter portion 51 having a large outer diameter at the lower end in FIG. , a small diameter portion 52 having a small outer diameter above it, and a shoulder portion 53 formed therebetween. The outer shape formed by the large diameter portion, the small diameter portion, and the shoulder portion is complementary to the inner shape of the large diameter portion, small diameter portion, and shoulder portion of the through hole 31. 1
The member 50 is freely rotatable about its axis within the borehole. A pin hole 55 is formed in the upper end portion 54 of the first member 50 and extends in a direction perpendicular to the central axis of the through hole. The bore 31 supporting the rotary jaw 40 is shown as being shared as the bore supporting the first member 50 of the shaft. Thus, the first member is the rotary jaw 4
0 is inserted into the through hole 31 from the slot side thereof, and then the rotary jaw 40 is installed in the through hole, thereby being restrained within the through hole. However, the through holes 31 do not necessarily need to be shared, and separate through holes may be provided. 1st
When the member is attached in the manner described above, the axial dimension of the first member must be equal to or smaller than the opening dimension of the slot (the vertical dimension in FIG. 1). If it is desired to make the opening dimension of the slot smaller than the axial dimension of the first member, before installing the rotating jaw 20 arranged on the lower leg in FIG. can be inserted into the through hole 31.

The second member 60 of the shaft has an eye hole 61 in the upper part in FIG. 1 and an eye hole 61 in the lower part.
It has bifurcated portions 63 each having a pin hole 62 extending in a direction perpendicular to a plane including the central axis of the bifurcated portion. The pin holed upper end of the first member is received between the two forked portions, aligned with the pin holes, and connected by bolts and nuts 56.

Effects of the invention According to the invention, the first member rotates around its axis.
Since it is free to rotate through 360 degrees and the second member can pivot about its pivot axis, it can follow tensile forces in virtually any direction, thus allowing the shaft, pivot axis, and clamp body to pivot. Unbalanced force is not applied to the shaft support.

Furthermore, compared to conventional shackle structures in which the shank structure is pivoted by two orthogonal axes, the number of parts is reduced, and therefore assembly is simple, and a robust and lightweight shank structure can be provided.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the technical idea of the present invention. It is.

For example, the axis of the eye hole in the second member and the
The axes of the bolts connecting the member and the second member do not necessarily need to be perpendicular to each other, and may be arranged parallel to each other. In a vertical hanging clamp, the through hole 31 for receiving the first member is formed at the base 12 of the clamp body.
It can be provided in In this case, it is necessary to provide means for restraining the first member within the through hole.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the present invention, and FIG. 2 is a sectional view taken along line 2--2 in FIG. Explanation of symbols, 10: Clamp body, 11: Legs, 12: Base, 20: Swivel jaw, 31: Through hole, 4
0: rotating jaw, 41: cylindrical part, 41a: groove, 4
2: gripping part, 43: stop pin, 50: first member,
51: Large diameter part, 52: Small diameter part, 53: Shoulder part, 5
4: Upper end of first member, 55: Pin hole, 56: Bolt/nut, 60: Second member, 61: Eye hole, 6
2: Pin hole, 63: Bifurcated part.

Claims (1)

[Claims for Utility Model Registration] [1] A generally U-shaped clamp body having a pair of legs forming a slot for receiving an article to be lifted and a base joining one end of the legs; A clamp having a pair of opposing jaws disposed on the legs for gripping an article, and a shackle for coupling the clamp body to a lifting cable or the like, the shackle comprising: a the pair of legs of the clamp body; It is rotatably supported in a through hole having a circular cross section extending from the inside of the slot toward the outside of the clamp body on a central plane passing through the base, and the central axis extends in a direction perpendicular to the axis of the through hole. a cylindrical first member having a pin hole oriented; b, one end of which is pivotally attached to the first member with a shaft pin, the central axis of which is oriented in a direction generally perpendicular to a plane containing the axis of the through hole; A structure of a shackle in a clamp, comprising: a second member having an eye hole at the other end; [2] In the structure described in claim 1 of the utility model registration, a. the first member has a small diameter portion having a small inner diameter at the outer end facing outward, and a shoulder formed therebetween; A large diameter part having a large outer diameter inscribed in the large diameter part of the through hole at the end, a small diameter part having a small outer diameter inscribed in the small diameter part of the through hole, and a shoulder formed between them. whereby the first member is inserted into the through hole from the slot side of the through hole and can freely rotate around the axis; c. the first member inserted into the through hole; A structure of a shaft in a clamp, characterized in that a restraining means for restraining a member within the through hole is provided. [3] In the structure set forth in claim 2 of the utility model registration claim, the restraining means is formed by one of the pair of jaws being disposed at the slot-side end of the through hole; A structure of a shaft in a clamp characterized by: