JPH0112057Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an elastic swing joint that is used by being attached to a connecting portion of water pipes.

Various types of joints are known that are capable of expanding and contracting at the connection portion of a water pipe and are capable of swinging within a predetermined angular range. This known joint expands and contracts when a load is applied to the water pipe.
Since the purpose is to absorb the load and prevent damage to the piping, it is unavoidable that the piping will expand and contract when a predetermined load is applied. However, in the case of water piping work, in order to inspect for water leaks after piping and before burying the pipe, for example, the diameter of the pipe is 30 mm.
If it is about mm, all the extensible parts of the joint will be in a fully extended state because the test is performed by applying a water pressure of 17.5 Kgf/cm ² . After this test is completed, it is necessary to return the expandable portion of each joint to its original position before burying it. In this case, if the piping section is long and many expansion/contraction joints are used, all the joints must be inspected and restored, which is an extremely troublesome task. If this troublesome work is not done, or if the joint is overlooked and the joint is fully extended, it may be implanted without restoring it to its original position, and if this happens, the use of the telescopic joint becomes completely meaningless.

An improvement on this is the device disclosed in Utility Model Application Publication No. 175888/1988, filed by the same applicant.
In the invention of this earlier application, approximately the same grooves are formed on the sliding surfaces of the union socket and the ball sleeve, and a load shear ring that fits into the grooves is attached to restrict the sliding between the two. Although it is possible to adjust the load shear ring so that it does not shear during a water pressure test, once the load shear ring is sheared and the union socket stretches due to an earthquake, etc., it will not be possible to prevent the load shear ring from shearing during a water pressure test. In some cases, the union socket does not stretch and excessive force is applied to the joint or elbow, causing damage and water leakage.

(Purpose of the invention) The present invention has been made to eliminate the above-mentioned drawbacks, and its purpose is to provide a swing joint that can be expanded and contracted in multiple stages in stages.

(Structure of the invention) The invention made to achieve this purpose is:
In a swing joint in which a union socket is connected to the body of the joint body via a ball sleeve so as to be able to swing within a predetermined angular range, a swing joint is provided with a union socket having a predetermined interval on the circumferential surface near the insertion end of the union socket. A stretchable material comprising a plurality of ring-shaped recesses, and an expandable stopper ring that abuts the rear end of the ball sleeve is fitted into the recess near the ball sleeve. Since it is a swing joint and the stopper ring is provided in the recess near the ball sleeve, the stopper ring is pushed out from the first recess and fits into the second recess when the first tensile force is applied. Here, the elongation of the union socket is suppressed, and when tensile force is applied again, the stopper ring is pushed out from the second recess and fits into the third recess, suppressing the elongation of the union socket. The union socket sequentially expands in response to a large tensile force each time to relieve the tensile force, thereby making it possible to avoid damage to the joint and elbow portion multiple times.

(Embodiment) Next, the present invention will be explained in more detail with reference to the illustrated embodiment. Reference numeral 1 is a joint body, and a union socket 2 is extendable and retractable from one end of the body portion 1a of the joint body. They are connected so that they can swing through a range of angles. For this connection, a ring-shaped ball sleeve 3 is provided that contacts and slides on the outer peripheral surface of the union socket 2, and a ring-shaped ball sleeve 3 is provided on the body 1a so that the curved outer surface of the ball sleeve 3 can slide. The inside of one end is formed into a concavely curved surface, and the ball sleeve is fitted into the concavely curved end of the body, and then the cap 4 is screwed together to prevent the ball sleeve from falling off to the outside.

O-rings 5 and 6 are installed between the union socket 2 and the ball sleeve 3 and between the ball sleeve and the body 1a, respectively, to prevent water from leaking between these parts. ing. A cover 7 made of styrene rubber or the like is attached so as to cover the cap 4 and one end of the body 1a together with a portion of the union socket 2.

In such a joint that expands and contracts and swings within a certain angular range, a plurality of ring-shaped recesses 8, 9, 10 are formed at predetermined intervals on the circumferential surface of the union socket 2 near the insertion end 2a,
Among the recesses, a stopper ring 11 is fitted into the first recess 8 near the ball sleeve 3.
This stopper ring 11 is made of wire material,
It has an expandable ring shape with a part cut off, and is fitted into the recess 8 by pressure due to its own predetermined diameter reducing force or elasticity. Therefore, the stopper force is determined by the diameter reduction force or the strength of the elastic force of the stopper ring 11.

Furthermore, the plurality of ring-shaped recesses 8, 9, and 10 provided on the peripheral surface of the union socket also form a gentle slope of the first stage recess 8, and the second stage recess 9 has a gentler slope than the first stage recess 8. By making the third recess 10 steeper and making the third recess 10 steeper than the second recess 10, the stopper force can be changed stepwise. When the stopper ring is fitted into the third recess 10, an extremely large force is required to remove it from the third recess 10, but even so the joint and elbow parts are prevented from being damaged.

(Function) In the swing joint of the present invention having the above configuration, the joint main body 1 and the union socket 2 rotate within a predetermined angular range vertically and horizontally due to the presence of the ball sleeve 3, and the union socket 2 rotates within a predetermined angle range. and the ball sleeve 3 are in a sliding state, and when a predetermined tensile force is applied, the first recess 8 provided on the circumferential surface of the union socket 2
The end of the ball sleeve 3 presses the stopper ring 11 fitted on the ball sleeve 3, and the stopper ring 11 is pushed open and slid along the tapered surface of the recess.
1 fits into the second recess 9. Then, when a larger tensile force is applied, the stopper ring is pressed and expanded by the ball sleeve in the same way as above, the union socket 2 slides, and the stopper ring 11 is fitted into the third recess 10. wear. In this way, when a tensile force of a predetermined magnitude is sequentially applied by an external factor, it slides or swings accordingly to prevent damage to the joint and elbow portion. In particular, by providing multiple recesses, unlike one with a single recess,
It is possible to constrain the degree of freedom of the joint. In other words, if there is only one recess, for example, if the stopper ring comes off from that recess due to a single earthquake, it will no longer have a large restraining force and will expand freely, making it easily susceptible to earth pressure. However, by providing multiple recesses, even if the stopper ring comes off from the first recess due to a single earthquake, it will not fit into the second recess. There is a certain degree of freedom between the first and second recesses, and if the load is greater than the first one in the next earthquake, the union socket will be removed from the second recess. It fits into the third recess. Therefore, by providing multiple recesses, there is a degree of freedom between each recess, and expansion and contraction between the recesses can be performed freely depending on external stress, but the union socket will not come off unless more stress is applied. Therefore, it can be maintained in a stable state.

(Effects of the invention) As explained above, the elastic swing joint according to the invention allows the union socket to swing within a certain angle range by using the ball sleeve, and also allows the insertion end of the union socket to A plurality of ring-shaped recesses are formed at predetermined intervals on the peripheral surface of the near side, and an expandable stopper ring is provided in the recess near the ball sleeve among the recesses, the stopper ring being able to abut against the rear end of the ball sleeve. By fitting it in, it has a structure that expands and contracts sequentially only when a predetermined load is applied, so it goes without saying that it will not expand during a water pressure test after water piping, but when external loads such as earthquakes are applied, The union socket stretches sequentially depending on the magnitude of the load, and compared to a joint that stretches all at once, it has the excellent effect of significantly suppressing damage to the joint, elbow, or piping. be.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing the main parts of the elastic swing joint according to the present invention, and FIG. 2 is a longitudinal side view showing the swing joint in a state in which the union socket is extended to the first stage. 1...joint body, 1a...body, 2...
Union socket, 2a... Insertion end, 3... Ball sleeve, 4... Cap, 5, 6... O-ring, 7... Cover, 8, 9, 10... Recess, 11
...Stotsuparing.

Claims (1)

[Claims for Utility Model Registration] (1) A swing joint in which a union socket is connected to the body of the joint body via a ball sleeve so as to be able to swing within a predetermined angular range, wherein the union socket A plurality of ring-shaped recesses are formed at predetermined intervals around the insertion end, and among the recesses, an expandable stopper ring that abuts the rear end of the ball sleeve is provided in the recess near the ball sleeve. An elastic swing joint characterized by being fitted with. (2) The swing joint according to item 1, wherein the plurality of ring-shaped recesses are formed by sequentially changing the inclination of the recesses, and the engagement force with the stopper ring is stepped.