JPS6319432Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coupling sleeve used in a crawler rod.

Conventionally, as one type of crawler rod, a crawler rod 1 having a threaded portion ₁₁ is known as shown in FIG. A cylindrical sleeve 2, as shown in longitudinal section in FIG. 2, is used as a coupling sleeve for the connection. That is, a male thread 1 1 having a diameter d ₁ and a length l ₁ is formed at the end of the crawler rod 1, and a male thread 1 ₁ having an outer diameter d 2 smaller than the diameter d ₁ and a length l ₁ is formed at the tip. A protrusion 1 ₂ with a diameter l ₂ is formed, and an annular inclined surface 1 ₃ is formed between a portion having outer diameters d ₁ and d ₂ .

On the other hand, the cylindrical coupling sleeve 2 has
A female thread 2 ₁ having an inner diameter d ₁ and a length l ₃ is provided from the open end of the opening end symmetrically with respect to the center O in the longitudinal direction, and the inner diameter
Relief part 2 ₂ with inner diameter d ₃ larger than d ₁ and length l ₄
is formed, and adjacent thereto, an inner bore 2 ₃ having an inner diameter d ₂ corresponding to the outer diameter d ₂ of the protrusion 1 ₂ of the crawler rod 1 is symmetrically about the center O and has a length l ₅ . It is formed. And in the escape part 2 ₂ ,
An inclined surface ₂₄ having a shape corresponding to the inclined surface ₁₃ of the crawler rod 1 is formed on the center O side.

In this way, when connecting the crawler rod 1 to the coupling sleeve 2, the male thread ₁₁ of the crawler rod 1 is screwed into the female thread ₂₁ of the sleeve 2. The protrusion ₁₂ is fitted into the inner hole ₂₃ of the sleeve 2, and at the same time, the inclined surface ₁₃ of the rod 1 and the inclined surface 24 of the relief part ₂₂ of the sleeve 2 come into contact with each other, and the coupling of the crawler rod 1 is brought into contact with the inclined surface ₁₃ of the rod 1. Axial movement of the sleeve 2 in the direction of the center O is prevented.

The provision of the relief portion 2 ₂ in the coupling sleeve 2 in this way is due to processing reasons for forming the internal thread 2 ₁ , and for this purpose, the protrusion 1 ₂ and the length of the crawler rod 1 are l ₂ and the diameter d ₁ of the female thread 2 ₁ of the coupling sleeve 2,
Inner diameter d ₃ of relief part 2 ₂ , inner diameter _{d 2 and} length l ₅ of inner hole 2 3
There is the following relationship between them.

d ₃ > d ₁ > d ₂ , l ₂ < 2×l ₅ , l ₃ < l ₁ However, as can be seen from this, the effective length l ₃ of the internal thread 2 ₁ of the coupling sleeve 2 is
It becomes shorter than the effective length l ₁ of the male thread 1 ₁ of the crawler rod 1, causing premature wear of both threads 1 ₁ and 2 ₁ and shortening their life. Furthermore, since a solid round bar is required as the material for the coupling sleeve 2, there are disadvantages in that the yield is low and a long processing time is required.

In addition, since machining the female thread 2 ₁ of the coupling sleeve 2 requires two steps, productivity is low, and furthermore, the length l ₂ of the protrusion 1 ₂ of the crawler rod 1 differs depending on the manufacturing company. So, even if
Even if the screws 1 ₁ and 2 ₁ match in shape, size, etc., there is a drawback that this cannot be applied to all crawler rods 1 of the same size.

Another type of crawler rod, as shown in FIG. 3, has a male thread 1' 1 having an outer diameter d ₁ and a length l ₁ formed at one end _of the crawler rod 1'.
On the other hand, as a coupling sleeve 2' for connecting these, as shown in Fig. 4, a cylindrical main body with a straight internal thread 2' ₁ having an inner diameter d ₁ and a length l ₆ is also available. In this case, the axial movement of the crawler rod 1' in the direction of the center of the coupling sleeve 2' is prevented by connecting the terminal end ₁₁₀ of the external thread 1'1 of the crawler rod ₁ '. , by engaging the starting end 2' ₁₀ of the internal thread 2' ₁ of the coupling sleeve 2'.

Also in this case, the length l' 1 of the male thread 1' ₁ of the crawler rod 1' and the length l' ₁ of the male thread 1' 1 of the crawler rod 1',
The following relationship exists between the length _l6 of the female thread 2'1 and the length l6 of the female thread _2'1 .

l ₆ >2×l' ₁ However, even if the type, dimensions, etc. of the female thread 2' ₁ of the coupling sleeve 2' shown in Fig. 4 are
Even if it matches the type of male thread 1 ₁ of the crawler rod 1 shown in Fig. 1, this male thread 1 ₁
It is not possible to use a coupling sleeve 2' for this crawler rod 1, since there is no axial stop for it.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a novel coupling sleeve for crawler rods that does not have the above-mentioned drawbacks of conventional coupling sleeves.

In the present invention, in order to achieve this purpose, a linear female thread is formed in the cylindrical body, a circumferential groove is provided in the longitudinal center of the body, and an appropriate cross-sectional shape is formed in the circumferential groove. It is characterized by having an annular metal stopper ring fitted therein.

Hereinafter, the present invention will be explained based on FIGS. 5 to 9 of the accompanying drawings showing embodiments thereof.

First, FIG. 5 shows an embodiment of the coupling sleeve according to the present invention. Female thread 10 with inner diameter d ₁ in the direction
₁ is formed into a straight line, and then a circumferential groove 10 ₂ having, for example, an arc-shaped cross section is provided in the longitudinal center of the groove.

Thereafter, as shown in FIG.
The sleeve 15 is completed by fitting into the inside of the sleeve ₂ an annular stop ring 11 having an outer peripheral surface corresponding to the cross section thereof, for example, a circular cross section.

In this case, as shown in FIG. 7, the stopper ring 11 has a notch 12 1 having an appropriate circular arc length in a portion of the metal ring ₁₂ having an outer diameter corresponding to the cross section of the circumferential groove 10 2 of the main body _10. Use one with
A notch 1 is formed in this metal ring ₁₂ in order to fix it inside the circumferential groove 102 of the main body 10.
2 ₁ , with the outer diameter reduced due to its elasticity, push the top of the female thread 10 ₁ from a part of the main body 10 in the longitudinal direction to the position of the circumferential groove 10 ₂ , and then insert the metal ring. 12 can be returned to its original state by its elasticity.

Note that the stopper ring 11 is not limited to such a circular cross section, and for example, as shown in FIGS. 8 and 9, the outer peripheral surface outline 13 ₁
corresponds to the contour of the circumferential groove 10 ₂ of the main body 10, but
The inner circumferential surface is a metal ring 13 having an approximately trapezoidal outline 13 ₂ , and a circular arc-shaped notch 1 is similarly formed on the metal ring 13 .
3 You may use the one formed by ₃ .

In this way, the coupling sleeve 15 according to the invention is similar to the conventional ones 2, 2' shown in FIG. 2 and FIG.
1' and the axial movement of the rods 1, 1' relative to the sleeve 15 is
This can be prevented by contact between the tip of the stopper ring 11 and the stopper ring 11. Also, in this case,
When a metal ring 13 as shown in FIGS. 8 and 9 is used as the stopper ring 11, the trapezoid 1
By appropriately changing the dimension of the width H at the top of the inner circumferential surface of _3.2 , the crawler rod 1 shown in FIG.
The length of the protrusion 1 ₂ can be adjusted to l ₂ .

Since the coupling sleeve for a crawler rod according to the present invention has the above-described structure and function, it can be seen that it can exhibit the following effects. Namely, 1. Since the effective length of the female thread that engages with the male thread of the crawler rod can be increased, the life of the coupling sleeve can be extended.

2. For the same reason, the contact length of the threaded portion of the crawler rod can be increased, thereby extending the life of the crawler rod.

3. Since thick-walled pipe can be used as the material, the material yield can be improved.

4. Processing costs can be reduced for the same reason.

5 By changing the shape of the stopper ring,
It can be used with any crawler rod as long as the thread shape of the crawler rod is the same.

6. Can also be used with the type of crawler rod shown in Figure 3 if no stopper ring is attached.

7. Only one internal thread cutting process is required (in contrast, in the case of the one shown in FIG. 2, it is two steps).

etc.

[Brief explanation of the drawing]

FIG. 1 is a partial front view showing one type of crawler rod for which the present invention is used, FIG. FIG. 4 is a vertical cross-sectional view showing an example of a conventional coupling sleeve therefor; FIG. 5 is a vertical cross-sectional view showing a semi-finished product according to an embodiment of the present invention; Figure 6 is a vertical cross-sectional view showing the finished product, Figure 7 is a front view showing the stopper ring, and Figure 8 is a longitudinal sectional view showing the finished product.
The figure is a front view showing the deformation of the stopper ring.
The figure is a sectional view taken along the - line in FIG. 8. 10... Body, 10 ₁ ... Female thread, 10 ₂ ... Circumferential groove, 11... Stopper ring, 12, 13...
Metal ring, 12 ₁ ... notch, 13 ₁ ... outer peripheral surface,
13 ₂ ... Inner peripheral surface, 13 ₃ ... Notch, 15 ...
coupling sleeve.

Claims (1)

[Claims for Utility Model Registration] 1. A female thread 10 ₁ is formed linearly on the inner surface of a cylindrical main body 10 having a certain length;
A crawler rod comprising a circumferential groove ₁₀₂ having an appropriate cross section is formed in the central part of the longitudinal direction of the roller rod, and an annular stopper ring ₁₁ having an appropriate cross section is firmly fitted inside the circumferential groove 102. Coupling sleeve for 2. The coupling sleeve according to claim 1, wherein the circumferential groove 10 ₂ has an arcuate cross section. 3. The coupling sleeve according to claim 1 or 2, wherein the cross section of the stopper ring 11 has an outer peripheral contour corresponding to the cross section of the circumferential groove 10 ₂ of the main body 10. 4. The coupling sleeve according to claim 1, 2 or 3, wherein the stopper ring 11 has a circular cross section. 5. The coupling sleeve according to claim 1, 2 or 3, wherein the cross section of the stopper ring 11 has an arcuate outer circumferential surface 13 ₁ and a trapezoidal inner circumferential surface 13 ₂ . 6. The coupling sleeve according to any one of claims 1 to 5, wherein the stopper ring 11 has notches 12 ₁ , 13 ₃ on a part of its circumference.