JPS647275B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a telescopic joint for connecting pipe bodies such as water pipes in a swingable and telescopic manner.

(Prior art) Conventionally, as this type of joint, for example,
There is one published in Publication No. 12949.

As shown in FIG. 7, this conventional type consists of two joint pipes Aa each having a convex spherical body 41, 41 screwed onto one end of a pair of joint bodies 1b, 1c having concave spherical parts 40, 40, respectively. , Ba are spherically slidably connected, and the joint tubes Aa and Ba are slidably fitted into each other. In addition, a ring body 42 is fixed to the outer circumferential position of the tip of the inner joint tube Aa, and the outer joint tube
A locking ring 43 is screwed onto the tip of Ba, and the locking ring 43 and the ring body 42 are brought into contact with each other to prevent the joint pipes Aa and Ba from coming off.

(Problem to be solved by the invention) Therefore, this type of pipe joint is simply a joint pipe Aa,
It is not enough just to prevent Ba from coming out;
In actual use, if the pipe bodies connected to the joint body are moved closer or farther apart than necessary, other pipes may be adversely affected. In such cases, there are many cases where it is desired to expand/contract the width of the joint within a predetermined range of dimensions.

However, in the conventional pipe joint, both joint pipes Aa and Ba are expandable and retractable until the locking ring 43 at the tip of the outer joint pipe Ba and the ring body 42 at the tip of the inner joint pipe Aa come into contact with each other. Therefore, the expansion/contraction dimension L is necessarily the joint pipe Aa,
It is limited to dimensions that are approximately the same as the length of Ba. Therefore,
For example, it is impossible to limit the expansion and contraction width of the joint to a desired size range shorter than the dimensions of the joint pipes Aa and Ba, and this has caused inconveniences in the use of the joint.

Furthermore, in the conventional art, in order to change the expansion/contraction dimension of a joint, the length dimension of the joint tube must be changed. However, in this case, for example, if the joint pipes Aa and Ba are shortened in order to reduce the expansion and contraction width of the joint, the distance between the joint bodies 1b and 1c will inevitably become smaller, and the distance between the joint bodies 1b and 1c will be set longer. This results in the inconvenience of not being able to do various things.

Furthermore, changing the length of the joint pipe has the disadvantage of complicating its manufacture, and especially when the diameter of the joint is large, the manufacturing work of changing the total length of the joint pipe becomes very large-scale and increases costs. As a result, the burden was becoming even more pronounced.

Therefore, the present invention improves the usability of the joint by making it possible to easily set the expansion/contraction width of the joint within a desired dimensional range without requiring the troublesome effort of changing the length of the joint pipe. Its purpose is to do so.

(Means for Solving the Problems) The present invention was invented to achieve the above object, and is connected to a pair of joint bodies 1 and 1' so as to be swingable so that the tube shaft portions 7 and 15 are fitted into each other. Of the pair of joined joint pipes A and B, a blocking ring body having a blocking part 20 extending inward in the radial direction is provided on the distal end side of the tube shaft portion 15 of one joint pipe B that fits onto the joint pipe A. 18 is detachably provided, and a blocking body 16 extending radially inward is protrudingly provided at a position on the inner circumferential surface of the tube shaft portion 15 of the joint pipe B that is a certain distance away from the blocking portion 20 of the blocking ring body 18. Moreover, a stopper body 9 is externally fitted onto the tube shaft portion 7 of the other joint pipe A in the annular space 30 between the blocking body 16 and the blocking portion 20, and the stopper body 9 This is a telescopic joint in which both joint pipes A and B are configured to be able to freely expand and contract relative to each other until either one of the body 16 and the blocking portion 20 is locked.

(Function) In the telescopic joint with the above configuration, the expansion and contraction movement of both joint pipes A and B is restricted by joint pipe A.
The stopper body 9 is the tube shaft portion 15 of the joint tube B.
This is done by abutting and locking the blocking body 16 protruding from the blocking body 16 and the blocking portion 20 of the blocking ring body 18, respectively.

Therefore, the expansion/contraction width of both joint pipes A, B is not restricted to the substantially same size range as the length of joint pipes A, B, and the range from the blocking part 20 of the blocking ring 18 set to the desired size to the blocking body 16 is The joint can be expanded or contracted within a distance range. Further, the expansion/contraction width of the joint can be changed by changing the position of the blocking body 16 protruding from the tube shaft portion 15 of the joint pipe B.
Since the distance from to the blocking portion 20 of the blocking ring 18 can be freely changed, there is no need to constantly change the overall length of the tube shaft portion 15.

Furthermore, by changing the position of the stopper body 9 externally fitted onto the joint tube A to the front end or rear end of the tube shaft 7, the sliding fitting position of the other joint tube B to the joint tube A can be changed. can be changed,
This allows the distance between the joint bodies 1 and 1' to be set to any desired dimension.

In addition, when assembling and manufacturing the joint, after fitting the tube shaft portion 15 of the joint tube B onto the tube shaft portion 7 of the other joint tube A, the removable blocking ring 18 is later inserted into the joint tube B. It can be installed in a simple manner, and the prescribed assembly work can be carried out appropriately.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In Fig. 1, 1 and 1' are a pair of joint bodies whose one end 3 side is threadedly connected to each end of the two pipe bodies C and D to be connected, and the other end side has a convex Spherical portions 4, 4 of the shape are formed. Reference numeral 5 indicates a locking step provided in a protruding state from the outer circumferential surface of the spherical portions 4, 4.

A and B are two joint tubes formed by integrally forming spherical portions 6, 6 on one end side of each tube shaft portion 7, 15 which are slidably fitted into each other, and the spherical portion 6,
6 is externally fitted onto the spherical portions 4, 4 of the joint bodies 1, 1' so as to be spherically slidable. 10, 10 are auxiliary ring bodies screwed onto the threaded portions 11 on the outer peripheral surfaces of the respective spherical parts 6, 6, and the spherical parts 6, 6 are connected to the joint bodies 1, 1'.
The inner peripheral surface portion thereof is in spherical contact with the outer periphery of the spherical surface portions 4, 4 in a state of engagement in the tube axis direction so as not to come off from the spherical surface portions 4, 4 side. 14 is a gasket for sealing.

Reference numeral 18 denotes a blocking ring which is screwed onto a threaded portion 17 formed on the outer periphery of the distal end of the tube shaft portion 15 of one joint tube B, and forms a blocking portion 20 extending in the radial direction inwardly. Reference numeral 21 denotes a sealing gasket interposed at a side position of the blocking portion 20. Reference numeral 16 denotes a blocking body protruding from the inner circumferential surface of the tube shaft portion 15 of the joint tube B. The blocking body 16 is separated from the blocking portion 20 by a desired distance l, and there is a gap between the blocking body 16 and the blocking portion 20. An annular cavity 30 is formed.

Reference numeral 9 denotes a partially cut-out ring-shaped stopper body that is fitted into a groove 8 formed on the outer peripheral surface of the tube shaft portion 7 of the other joint tube A, and is attached to the annular cavity 30.
It is set to be located within.

The joint according to this embodiment has the above configuration, and an example of its use will be described next.

First, as shown in FIG. 1, the joint pipe B is fitted over the other joint pipe A and connected, and the joint bodies 1 and 1' are connected to the ends of the pipe bodies C and D, respectively, thereby forming the pipe bodies C and D. D can be connected, but the blocking ring 20 is not attached to the joint tube B when the tube shaft portions 7 and 15 of both the joint tubes A and B are fitted together. The blocking ring body 20 is connected to the joint pipe A in advance.
It is sufficient to fit the joint pipes A and B together, and then screw them onto the distal end of the joint pipe B after fitting the joint pipes A and B together. Through this procedure, the predetermined assembly work can be performed properly.

Next, when the ground of either or both of the pipe bodies C and D sinks, and a level difference H occurs between them as shown in Fig. 2, both joint pipes A and B are connected to each joint body 1, At the same time as the tubes swing relative to 1', they mutually expand or contract to absorb the difference in level between the tubes C and D. As a result, loads such as undue bending acting on the tubes C and D are alleviated, and the tubes can be protected.

At that time, as shown in Figure 3, the joint tube A,
If B undergoes a large elongation, the stopper body 9 on the joint pipe A side will stop the blocking part 20 on the joint pipe B side.
, and further movement of the joint tube A in the direction of arrow A with respect to the joint tube B is prevented. Therefore, it goes without saying that both joint pipes A and B will not be unduly pulled out, and the extension of the joint beyond the desired size is appropriately prevented, so that no adverse effects are exerted on other connecting pipe bodies and the like.

On the other hand, when both joint pipes A and B contract significantly as shown in FIG. is blocked and tubes C and D
It is possible to prevent the objects from coming close together unnecessarily.

The expansion and contraction width of both joint pipes A and B is approximately the same as the mutual dimension l between the blocking part 20 and the blocking body 16,
If the expansion and contraction width of the joint pipes A and B has to be changed depending on the usage conditions of the joint, the protruding position of the blocking body 16 is changed and the distance l from the blocking body 16 to the blocking part 20 is changed. Just let it happen. That is, it goes without saying that the joint tube A side can be left as is, but even if the other joint tube B is remanufactured, there is no need to change the entire length of the tube shaft portion 15.

Further, even if the expansion/contraction width of the joint is the same, there are cases where it is desired to change the distance between the two joint bodies 1, 1' depending on the usage conditions. In this case, the position of the stopper body 9 externally fitted onto the tube shaft portion 7 of the joint tube A may be changed. That is, the stopper body 9 is placed on the distal end side of the joint tube A (left side in Fig. 1).
If changed to , joint pipe B can be freely expanded and contracted within a predetermined width while fitted to the distal end of joint pipe A, but in this case, the distance between the two joint bodies 1 and 1' You can increase the distance. In addition, if the stopper body 9 is externally fitted in a position opposite to that described above, both the joint pipes A and B are fitted over a long dimension range, and the distance between the two joint bodies 1 and 1' can be set small. It is.

In the above embodiment, the spherical parts 6, 6 of the joint tubes A, B are fitted onto the spherical parts 4, 4 of 1, 1', but the present invention is not limited thereto. For example, as shown in FIG.
It may be fitted externally. Also, as shown in Fig. 6, the spherical part 6 of one joint tube A is fitted onto the spherical part 4 of the joint body 1, and the spherical part 6 of the other joint tube B is inserted into the spherical part 4 of the joint body 1'. There is no problem even if they are fitted together.

In short, the spherical portions of the joint tubes A and B are connected to the spherical portions of the joint bodies 1 and 1' so that the joint tubes A and B are swingably connected to the respective joint bodies 1 and 1'. It only needs to be able to slide freely on a spherical surface.

In addition, if step parts 5, 5' for locking are provided on the spherical parts 4, 6 of the joint bodies 1, 1' and the joint pipes A, B,
It is preferable that the joint pipes A and B can be restricted from swinging beyond a certain angle with respect to the joint bodies 1 and 1'. For example, joint tube A at an angle as shown in Figure 2,
If the swinging motion of B is stopped, the ends of the spherical parts 4, 4 of the joint bodies 1, 1' will be connected to the joint pipes A, 1'.
The spherical parts 4, 4 can be prevented from protruding into the interior of B.
This has the advantage that it is possible to appropriately prevent the flow of fluid within the joint pipes A and B from being obstructed. However, in the present invention, it is not necessary to provide this means. Furthermore, if both the joint body 1' and the joint tube B are covered with the rubber cover body 22 as shown by the two-dot chain line in FIG. 5, there is an advantage that foreign matter can be prevented from entering the spherical sliding part. However, such measures are not essential.

Moreover, the present invention also provides joint bodies 1, 1' and pipe bodies C, D.
The specific connection means with the above-mentioned example is not limited to the screw connection as in the above embodiment. For example, a flange connection or the like may be used.

In addition, the present invention provides a blocking ring 20, a blocking body 16,
The specific structure of each part, such as the stopper body 9, can be freely modified within the scope of the present invention.

(Effects of the Invention) As described above, the present invention has a blocking portion of a blocking ring on the inner circumferential surface of the tube shaft portion of one of the two jointed tubes that are fitted together. and a blocking body, and a stopper body is externally fitted on the outer periphery of the tube shaft portion of the other joint pipe located between the two, and the stopper body is locked to the blocking part or the blocking body. Since both joint tubes are configured to be able to expand and contract within the range that is possible, the expansion and contraction width of both joint tubes is not restricted to be approximately the same as the length of the joint tube as in the past, and the blocking portion and the blocking body are By setting the mutual distance between the joints, the expansion and contraction width of the joint can be appropriately set to an appropriate size according to the conditions of use, and the usability of the joint can be improved, which is a special effect.

Moreover, in the present invention, the mutual distance between the blocking body and the blocking part can be increased or decreased as desired by simply changing the position of the blocking body, and compared to the conventional means of drastically changing the overall length of the joint pipe. It also has the practical benefit of being extremely simple and inexpensive to manufacture.

Furthermore, in the present invention, by changing the mounting position of the stopper body that is located between the blocking part and the blocking body and is locked therewith, the length over which the pipe shaft parts of both joint pipes are fitted into each other can be reduced. It also has the advantage that it can be changed, and the distance between the pair of joint bodies can be increased or decreased depending on the usage conditions of the joint.

In addition, in the present invention, since the blocking ring body having the blocking portion is detachably attached to the joint pipe, the assembly work of the joint can be easily and properly performed and is practical.

[Brief explanation of drawings]

FIG. 1 is a half-cut sectional view showing an embodiment of a joint according to the present invention. Figure 2 is a half-cut sectional view of the same when a head difference occurs. Figure 3 is a half-cut cross-sectional view of the joint tube in a state where it is fully extended. FIG. 4 is a half-cut sectional view of the joint tube in a contracted state. FIGS. 5 and 6 are half-cut sectional views showing other embodiments. FIG. 7 is a half-cut sectional view showing a conventional example. 1, 1'... Joint body, 4, 4... Spherical part, 6,
6... Spherical part, 7... Tube shaft part, 9... Stopper body, 16... Blocking body, 18... Blocking ring body, 20...
...Blocking part, A, B...joint tube.

Claims (1)

[Claims] 1 A pair of joint bodies 1 formed with spherical parts,
1', and a spherical part that is slidable on the spherical part of the joint bodies 1, 1' on one end side of the tube shaft parts 7, 15, and is swingable with respect to each of the joint bodies 1, 1'. A telescopic joint comprising a pair of joint pipes A and B connected to each other, and in which the joint pipes A and B have their tube shaft portions 7 and 15 fitted to each other so as to be mutually expandable and contractible. A blocking ring body 18 having a blocking portion 20 extending radially inward is removably provided on the distal end side of the tube shaft portion 15 of one of the joint tubes B which is fitted onto the joint tube A, and the blocking ring body 18 has a blocking portion 20 extending radially inward. A blocking body 16 extending radially inward is provided on the inner circumferential surface of the tube shaft portion 15 of the joint tube B at a certain distance from the blocking portion 20 of the body 18, and the blocking body 16 and the blocking portion 20 A stopper body 9 is externally fitted onto the tube shaft portion 7 of the other joint pipe A in the annular space 30 between them, and either of the blocking body 16 and the blocking portion 20 is fitted onto the stopper body 9. A telescoping joint characterized in that both joint pipes A and B are configured to be able to expand and contract relative to each other until one of them is locked.