JP2005257060A - Shackle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shackle having rigidity and enabling the easy removal of a shackle shaft inserted into a shackle body. <P>SOLUTION: In this shackle formed by inserting the shackle shaft into an insert hole formed at each free end part of the U-shaped shackle body, a female screw is formed in the insert hole at one free end part, the diameter of the insert hole at the other free end part is set smaller than the diameter of one side insert hole, and a male screw threaded with the female screw is engraved at the neck part of the shackle shaft. An insert part into the small diameter insert hole is formed at the tip part, and an area between the tip insert part and the male screw is formed as a spacer part for maintaining a distance between the free end parts. Thus, since the deformation of the shackle body can be minimized by the spacer part, the shackle shaft can be easily removed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shackle used to hang and hang a wire rope or the like in lifting or moving heavy objects such as a wire rope. More specifically, the shackle shaft attached to the shackle body is removed. The present invention relates to a shackle that can be easily performed.

The shackle is divided into a straight shackle and a bow shackle in the old JIS B2801, and each has a shackle body and a shackle shaft including a shackle bolt, an eyebolt, a shackle pin, and the like.
For example, in a straight shackle, a shackle shaft is inserted into each insertion hole provided at each free end of the shackle body formed in a substantially U shape, and the male screw at the tip of this shackle shaft is formed in one insertion hole of the shackle body. It is used by being screwed onto.

By the way, the shackle constructed in this way usually connects the shackle shaft to the heavy rope and attaches the wire rope to the U-shaped part (crown part) of the shackle body and lifts it. The shackle shaft acts as a shearing force on the shackle shaft in a direction orthogonal to the axial direction of the shackle shaft, so that the shackle shaft is subjected to a treatment such as quenching to increase the Rockwell hardness and maintain a predetermined strength.
However, when an unexpected load due to impact or the like is applied to a heavy object that has been lifted, the load that is the sum of the load of the heavy object and the unexpected load is applied to the shackle shaft as a shearing force. This acts in a direction (inward direction) in which the separation distance of the free end portion is narrowed, and as a result, the shackle body may be deformed and the shackle shaft cannot be removed.
Then, after heating the crown part of the shackle body with a burner etc., the free end part is smashed with a hammer and forcibly expanded to remove the shackle shaft or cut the crown part of the shackle body. The shackle will be discarded as a result.

  Under such circumstances, as means for preventing deformation of the shackle body, for example, as in Patent Document 1, female threads 3 are respectively provided in the insertion holes provided in the free ends of the U-shaped shackle body 1, and the shackle shaft 5 It is conceivable that the male screws 7 and 7 formed in the above are screwed into these female screws 3 and 3 so that the distance between the free ends is maintained (see FIG. 4).

  Registered Utility Model No. 3044789

  However, since this structure requires dimensional accuracy for the lead and pitch of the threaded portion as well as the separation distance W of each free end, not only is it cumbersome to manufacture but also costs increase, There is a problem that the shackle shaft 5 cannot be used if a slight deviation occurs.

  Also, a structure has been proposed in which a tubular spacer member is attached to the shackle shaft and the distance between the free ends of the shackle body is held by the tubular spacer member. In this case, however, the number of members increases, so the manufacturing cost is increased. There have been problems such as an increase in maintenance and complicated maintenance management.

  The present invention was devised in view of such a problem, and provides a shackle that can be easily manufactured and managed and can be easily removed even if the shackle body is slightly deformed. It is intended.

  That is, in the present invention, the internal thread is formed in the insertion hole of one free end portion of the shackle formed by inserting the shackle shaft into the insertion hole provided in each free end portion of the U-shaped shackle body and the other free end portion is formed. The diameter of the insertion hole is set to be smaller than that of the one insertion hole, and a male screw that engages with the female screw is formed on the neck portion of the shackle shaft, and an insertion portion for the small diameter insertion hole is formed at the tip portion. Further, the space between the distal end insertion portion and the male screw is configured as a spacer portion that maintains the separation distance of each free end portion.

  In this case, it is preferable that the tip insertion portion of the shackle shaft and the spacer portion are defined by the step portion, and the size is set so that the step portion faces the step portion provided in the small diameter insertion hole of the shackle body.

  As an alternative, a configuration in which the small diameter insertion hole of the shackle body and / or the tip insertion portion of the shackle shaft is formed in a tapered shape can be adopted.

  Furthermore, the cross-sectional shape of the U-shaped portion of the shackle body may be set to a rounded substantially triangular cross-section having a curved shape in which the curvature of the inner edge is smaller than the curvature of the outer edge.

According to the shackle according to the present invention thus configured;
(1) The spacer portion provided between the tip insertion portion of the shackle shaft and the male screw holds the separation distance of each free end portion of the U-shaped shackle body so that the deformation of the shackle body is prevented as much as possible. The rigidity can be sufficiently functioned, and therefore the shackle shaft can be easily removed.
(2) Further, when compared with a conventional shackle, only the work of engraving the small diameter insertion hole of the shackle body and the male thread at the neck portion of the shackle shaft is required, so that the manufacturing becomes easy and the cost can be reduced.
(3) Since the tip insertion portion and the spacer portion are defined by a step portion and the size is set so that the step portion faces the edge of the small diameter insertion hole of the shackle body, each free end portion of the shackle body Can be reliably maintained.
(4) In addition, since the small diameter insertion hole of the shackle body and / or the tip insertion portion of the shackle shaft is formed in a tapered shape, the tip insertion portion is inserted while maintaining the separation distance of each free end portion. Positioning when inserting into the hole can be performed easily.
(5) Furthermore, the cross-sectional shape of the crown portion (U-shaped portion) of the shackle body is set to a rounded substantially triangular cross-section having a curved shape in which the curvature of the inner edge is smaller than the curvature of the outer edge. Therefore, in combination with the improvement in the rigidity of the shackle body itself, various effects such as a shackle having a large load resistance can be obtained.

Next, the best mode for carrying out the shackle according to the present invention will be illustrated and described in detail below.
1 and 2, the shackle according to the present invention is a straight shackle 10, and is composed of a shackle body 12 formed of a round bar and an aisle bolt 14 as a shackle shaft.

  The shackle body 12 and the aisle bolt 14 as the shackle shaft are made of quilted steel (corresponding to SCM435) containing 0.025% or less of phosphorus P and sulfur S as impurities, and sorbite that has been quenched and tempered. It is formed as an organization. More specifically, the shackle body 12 has a Rockwell hardness of HRC 32 to 38, preferably 34 to 38, and a breaking strength of 1000 N / mm 2 or more and less than 1250 N / mm 2, preferably 1000 N / mm 2 to 1200 N / The isle bolt 14 as a shackle shaft has a Rockwell hardness of HRC 37-43, preferably 39-43, and a breaking strength of 1250 N / mm 2 or more and less than 1450 N / mm 2, preferably Is formed at 1250 N / mm 2 to 1400 N / mm 2. In addition, the breaking stress of the shackle body 12 and the aisle bolt 14 as the shackle shaft is a rod shape that is subjected to the same heat treatment with the same material as the shackle body 12 (and the aisle bolt 14) according to JIS Z2201 (metal material test piece). It can obtain | require from the tensile load which created the test piece and carried out the tension test of this test piece.

The shackle body 12 is formed at a pair of straight flange portions 16, 16 facing each other, a U-shaped portion (crown portion) 18 continuous to the straight flange portions, and ends of the straight flange portions 16, 16. Ring portions 24 and 24 each having an insertion hole 20 and 22 for inserting 14 are integrally formed, and are formed in a substantially U shape as a whole.
In this case, an internal thread 26 is formed in one insertion hole 20 of the shackle body 12, and the diameter A of the other insertion hole 22 is set slightly smaller than the diameter B of the insertion hole 20 and is inserted. A step portion 28 that abuts on a step portion 36 of the aisle bolt 14 to be described later is provided around the inlet portion of the hole 22.

  On the other hand, the aisle bolt 14 is formed of a rod-like body in which a knob portion 30 and a collar portion 32 are connected to one end side, and a male screw 34 screwed to the female screw 26 is engraved on a neck portion adjacent to the collar portion 32. In addition, an insertion portion 38 to the insertion hole 22 having a small diameter is formed on the other end side through a step portion 36, and further, a space between the insertion portion 38 and the male screw 34 is formed between the straight portions 16, 16. The spacer 40 is configured to hold the separation distance W. In this case, if the end portion of the insertion portion 38 of the aisle bolt 14 is chamfered as in this embodiment, it is easily inserted when the aisle bolt 14 is inserted into the insertion holes 20 and 22 of the shackle body 12. This is preferable.

The shackle according to the present invention configured as described above has a wire rope attached to the crown portion 18 of the shackle body 12 in a state where the aisle bolt 14 as a shackle shaft is passed through a static line such as a rope tightened with a heavy object. The end of the insertion portion 36 of the aisle bolt 14 is chamfered, and the insertion portion 36 itself is set to have a small diameter, so that the insertion hole 20 (internal thread 26) of the shackle body 12 is used. The insertion operation into the insertion hole 22 can be performed very easily.
Further, the load of the heavy load is smoothly transferred from the spacer portion 40 of the eyebolt 14 to the stepped portion 36 to the crown portion 18 to the wire rope via the stepped portion 28 of the insertion hole 22 and the screwed portion of the female screw 26 and the male screw 34. Since it is transmitted, it is possible to prevent the straight parts 16, 16 (free ends) from deforming inward as much as possible.
Furthermore, even if some deformation or the like occurs in the shackle body due to use, since the tip of the aisle bolt is not screwed as in the prior art, the aisle bolt 14 can be moved only by gripping and turning the knob 30. It can be easily removed.

FIG. 3 shows another embodiment of the shackle according to the present invention in which the small-diameter insertion hole 22 provided in the shackle body 12 is formed as a tapered tapered insertion hole 22a. In this embodiment, the small-diameter insertion hole is formed. It is not necessary to form a stepped portion in the hole 22, and since the spacer portion 38 functions in the same manner as the shackle shown in FIG. 1, manufacturing can be facilitated.
In the embodiment of FIG. 3, the small diameter insertion hole 22 is formed in a tapered shape. However, the same effect can be obtained even if the insertion portion 38 of the aisle bolt 14 is formed in a tapered shape. Furthermore, it goes without saying that both the small diameter insertion hole 22 and the insertion portion 38 may be tapered.

  In FIG. 4, the cross section of the crown portion (U-shaped portion) 18 of the shackle body 12 is set to a rounded substantially triangular cross section S having a curved shape in which the curvature of the inner edge is smaller than the curvature of the outer edge. This embodiment is still another embodiment of the shackle according to the present invention. In this embodiment, the shackle body 12 itself can be formed as a shackle having a large load resistance in combination with the improvement in rigidity of the shackle body 12 itself.

In the above description, the straight shackle is illustrated and described as an embodiment of the shackle according to the present invention.
Moreover, although the eyebolt has been exemplified as the shackle shaft, the present invention is not limited to this, and it goes without saying that a hexagon bolt or a flat head pin may be used if necessary.
Furthermore, although killed steel (equivalent to SCM435) has been exemplified as a shackle material, it goes without saying that stainless steel can be used as a rust prevention measure in the case of a shackle used near a ship or the beach.
Furthermore, according to the use of the shackle, the size is set so that the tip of the insertion portion 38 of the shackle shaft (isle bolt 14) protrudes outward from the insertion hole 22, and a retaining nut and / or pin is provided at the protrusion. It goes without saying that various design changes can be made without departing from the spirit of the present invention, such as a configuration in which the device can be mounted.

It is a partial cross section explanatory view showing an embodiment of a shackle according to the present invention. It is a partial cross section explanatory drawing which expanded the principal part of the shackle shown in FIG. It is another embodiment of the shackle according to the present invention, and is a cross-sectional explanatory view of the main part showing the relationship between the tapered and tapered insertion hole provided in the shackle body and the step portion of the aisle bolt. It is further another embodiment of the shackle which concerns on this invention, Comprising: It is a partial cross section explanatory drawing which shows the cross-sectional shape of the crown part of a shackle body. It is a partial cross section explanatory view showing the conventional shackle.

Explanation of symbols

10: Straight shackle,
12: Shackle body 14: Aisle bolt (shackle shaft),
16: Nagisabe,
18: U-shaped part (crown part),
20: insertion hole,
22: Insertion hole (small diameter),
22a: Tapered tapered insertion hole,
24: Ring part,
26: female thread,
28: Step part 30: Knob part 32: Gutter part 34: Male screw,
36: Step,
38: Insertion part 40: Spacer part

Claims (4)

  In a shackle formed by inserting a shackle shaft into an insertion hole provided at each free end of a U-shaped shackle body, a female screw is formed in one insertion hole and the diameter of the other insertion hole is smaller than that of the one insertion hole. The diameter is set, and a male screw that is screwed into the female screw is engraved on the neck portion of the shackle shaft, and an insertion portion to the small-diameter insertion hole is formed at the tip portion, and further, the gap between the tip insertion portion and the male screw is formed. A shackle configured as a spacer portion that maintains a separation distance between each free end portion.   The tip insertion portion of the shackle shaft and the spacer portion are defined by a step portion, and the dimension is set so that the step portion faces the step portion provided in the small diameter insertion hole of the shackle body. Shackle.   The shackle according to claim 1, wherein the shackle body has a small diameter insertion hole and / or a tip insertion portion of the shackle shaft formed in a tapered shape.   The cross-section of the U-shaped portion of the shackle body is set to a rounded substantially triangular cross-section having a curved shape in which the curvature of the inner edge is smaller than the curvature of the outer edge thereof. Shackle according to any one of the above.

Images