JPS6114779Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a lock ring in a pipe joint.

Conventionally, for example, as disclosed in Japanese Patent Publication No. 56-13235, a lock ring and a locking protrusion have been provided in a joint portion formed by a socket of one pipe and an insertion port of the other pipe so as to be engageable with each other. A method of preventing separation by engaging the ring and the protrusion is generally known. However, the lock ring is divided into parts around the circumference, and the connection spacer, the coupling tool, the length adjustment bolt, and the turnbuckle used for inserting the coupling tool between the spacers are connected through this division part. Since the length of the lock ring is adjusted using a tool, it is difficult to adjust the length of the lock ring because it requires a jig or a coupling tool of different length. There were drawbacks such as extremely poor work efficiency when installing the

This invention eliminates the drawbacks of the conventional ones mentioned above, allows the length of the lock ring to be adjusted without the need for the above-mentioned jig, makes it easy to install the lock ring, and provides a lock ring for pipe fittings that is sure to prevent the lock ring from coming off. The purpose is to provide.

In order to achieve the above object, this invention is characterized by adopting the following configuration. That is,
At both divided ends of the lock ring, a notch is formed in which both ends of the divided end and both ends of the adjacent space can be fitted in an overlapping manner, and the notch is fitted into the side walls of both ends of the lock ring with this notch and the notch. A plurality of mounting holes are formed in each of the side walls of both ends of the spacer along the circumferential direction of the lock ring, and the pitch of one end of the spacer in these mounting holes is set at one end of the lock ring adjacent to one end of the spacer. The pitch at the other end of the spacer is set to be smaller than the pitch at the other end of the spacer, and the pitch at the other end of the spacer is set larger than the pitch at the other end of the lock ring adjacent to the other end of the spacer. The pitch difference is set to be smaller than the difference between the pitch on the other end side of the spacer and the pitch on the other end side of the lock ring, and any mounting hole where the hole surfaces of the mounting holes on the one end side of the lock ring and the spacer are coincident is set. A connecting tool is inserted between the lock ring and the spacer, and between arbitrary mounting holes where the hole surfaces of the other end side mounting holes of the lock ring and the spacer match, and the two divided ends of the lock ring and both ends of the spacer are connected. That's true.

Next, the effect will be explained. To connect both divided ends of the lock ring and both ends of the spacer, fit the side walls of both ends of the spacer into the notches formed in the side walls of both ends of the lock ring, and then fit the side walls of both ends of the spacer into the notches formed in the side walls of both ends of the lock ring. Insert the connector between any matching mounting holes to attach and connect. At this time, since the pitches on one end and the other end of the spacer and the pitches on the corresponding one end and the other end of the locking ring are set to different pitches as described above, it is ensured that the hole surfaces match. Any mounting hole can be provided.

The lock ring connected via the spacer as described above is attached to the annular groove formed on the inner surface of the tube socket or the outer surface of the tube socket, and even if an external force is applied to both tubes in the direction of separating them from each other, This pulling out force is achieved by a locking protrusion formed on the outer surface of the socket or the inner surface of the socket.
This is prevented by engagement with the lock ring, and separation of both tubes is reliably prevented.

This invention has the following unique effects. In other words, the length of the lock ring can be adjusted without using a conventional length adjustment tool, etc., by attaching two separate ends of the lock ring and both ends of the spacer to mounting holes with different pitches. It can be done by simply inserting the coupling tool, installing it, and connecting it, and when making this adjustment,
The pitch at one end of the spacer in the mounting hole is smaller than the pitch at one end of the lock ring adjacent to the one end of the spacer, and the pitch at the other end of the spacer is adjacent to the other end of the spacer. Furthermore, the difference between the pitch on one end of the spacer and the pitch on one end of the locking ring is set to be smaller than the difference between the pitch on the other end of the spacer and the pitch on the other end of the locking ring. Therefore, fine adjustment can be made at one end of the spacer and lock ring, and coarse adjustment can be made at the other end, and the fine and coarse adjustments can be made as appropriate. In addition, since the length of the lock ring can be easily adjusted as described above, the work of installing the lock ring is easy, and the work efficiency can be significantly increased, and the joint part can be prevented from coming off.

An embodiment of this invention will be described below.

In the first embodiment shown in FIGS. 1 to 4, 3 is a tube 1.
The socket 4 is an insertion port for the tube 2, and an annular packing 5 is interposed between the inner surface of the socket 3 and the outer surface of the insertion port 4 by being engaged with a projection 6 formed on the inner surface of the socket. There is. An annular groove 7 is formed on the inner surface of the tip end of the socket 3, and a lock ring 8 is attached to this groove 7. Reference numeral 9 denotes an annular locking projection formed on the socket 4 and capable of locking with the lock ring 8. The engagement between the projection 9 and the lock ring 8 prevents the socket 3 and the socket 4 from coming apart from each other. are doing.

The lock ring 8 is divided into one circumference,
A connection spacer 10, shown enlarged in FIGS. 3 and 4, is connected to the divided portion of the lock ring 8. Notches 10a, 8a and 10b, 8b are formed at both ends of the spacer 10 and the divided ends of the lock ring 8, and at adjacent parts thereof, the side walls thereof face each other. Notches 8a, 8
A plurality of screw holes 11 are provided along the circumferential direction of the lock ring in the side walls of both ends of the lock ring 8.
Similarly, a plurality of holes 12 are bored at different pitches in the side walls of both ends of the spacer 10 where the notches 10a and 10b are located, and any screw hole 11 or hole 12 with matching hole surfaces is formed. The divided end of the lock ring 8 and both ends of the spacer 10 are connected by screwing together a set screw 13 having a bolt hole formed in its head. The pitches of the screw holes 11 and the screw holes 12 are set so as to absorb the amount of change in the length of the lock ring 8 and the spacer 10, assuming that the tolerance of the pipe outer diameter D is ±α mm, and this is shown in FIG. In the example, the pitch of the hole 12 at one end of the spacer 10 is a, the pitch of the screw hole 11 at the split end of the lock ring 8 opposing this is b, and the pitch of the hole 12 at the other end of the spacer 10 is c. If the pitch of the screw holes 11 at the split ends of the opposing lock rings 8 is d, then a<b, c>d (e>d>b>a). Further, the difference between pitch a and pitch b is smaller than the difference between pitch c and pitch d. By appropriately adjusting these pitches via set screws 13, it is possible to accommodate length changes of D±αmm.

This device is as described above, and its operation is explained by first fitting the lock ring 8 into the outer surface of the socket 4 of the pipe 2 before joining the joint, and using a jig (not shown) to attach the lock ring 8 to the outside surface of the socket. The notches 8a, 10a and 8b, 10b of the lock ring 8 and the spacer 10 connected thereto are tightly fitted together.
The screw hole 11 and the screw hole 12 in the side wall of the end are set at positions where their hole surfaces coincide. At this time, since the screw holes 11 and the screw holes 12 are set at the pitches described above, the lock ring 8 and the spacer 10
Make fine adjustments using the screw holes 11 and 12 with small pitches on one end side, and screw holes 11 and 12 holes with large pitches on the other end side of lock ring 8 and spacer 10.
2 allows coarse adjustment, fine coarse adjustment is possible, and the length of the lock ring 8 in the circumferential direction can be adjusted at relatively small intervals. Then, a set screw 1 is placed between the screw hole 11 and the screw hole 12 whose screw hole surfaces match.
3 and tighten. Next, remove the setscrew 13 from one of the two places tightened on the end of the spacer 10, and then
After marking 2, the lock ring 8 is removed from the outer surface of the socket 4.

Next, the lock ring 8 with the spacer 10 still connected to the other part is installed in the groove 7 of the socket 3 of the pipe 1, and the packing 5 is also attached to the socket 3.
It is attached by locking it to the protrusion 6 of. Then, when inserting the socket 4 into the socket 3, in order to prevent the protrusion 9 of the socket 4 from coming into contact with the lock ring 8, the split end of the lock ring 8 with the bolt 13 removed at one location and the spacer 10 are inserted. After inserting an enlarging device (not shown) between the end of the socket and the end of the tube to spread the lock ring and applying lubricant to the outer surface of the socket 4 and the inner surface of the packing 5, insert the socket 4 into the socket 3 and open the tube. 2 and tube 1 are joined.
Screw hole 1 marked after and before joining
1. Screw the setscrew 13 into the hole 12 again and tighten one part of the spacer 10 and the lock ring 8. At this time, since the screw hole 11 and the hole 12 are provided on the end side wall of the lock ring 8 and the spacer 10, it is easy to tighten the set screw 13. If part 12 is not exposed, tilt the tube 1 downward to the right in Fig. 1 and make the gap 14 larger, or insert a 10-minute spacer window on the distal end of the socket 3 as shown in Fig. 5. This can be done by forming a hole 15 and using this window hole.

Lock ring 8 and spacer 10 as described above.
Even if an external force is applied to the pipes 1 and 2 that are joined together via the locking ring 8 attached to the protrusion 9 of the socket 4 and the groove 7 of the socket 3, this force (removal force) This will ensure that both tubes 1 and 2 are prevented from separating.

7 to 9 show other embodiments of this invention, and the second embodiment shown in FIG.
This is different from the first embodiment in that the lock ring 22' is formed separately along the length and is connected to the divided part of the lock ring 21, and the pitch of the screw hole 23 and the hole 24 is f>e, g>h, i>j(g>i>h,
j>f>e, h=j). In the third embodiment shown in FIG. 8, notches 31a and 31b formed at the divided end portions of the lock ring 31 are formed in the same direction without facing each other on the side walls, and a thin straight wall with no notches formed at both ends. This differs from the first embodiment in that a shaped spacer 32 is fitted into the notches 31a and 31b for connection, and the pitches of the screw holes 33 and the holes 34 are l>k, m>n. (m>n>l
>k). A fourth embodiment shown in FIG. 9 is a spacer 4 in which notches 41a and 41b are formed at the center in the longitudinal direction of the divided ends of a lock ring 41, and a protrusion 45 is formed at the center in the longitudinal direction of both ends.
This differs from the first embodiment in that the screw hole 43 and the screw hole 4 are connected by fitting into the notch.
The pitch of 4 is q, q′>p, r<s, (r<S,
S'>q, q'>p, S=S', q=q'). In the above embodiment, the locking ring and the spacer are attached using a screw hole, a blank hole, and a set screw, but instead of this, a round hole and a mounting pin may be used, or a screw hole may be attached to the spacer. The locking ring may be provided with a blank hole, and the pitch between the holes is not limited to that shown in each of the above embodiments, but may be reversed between the locking ring and the spacer, or may be reversed in each of the above embodiments. It goes without saying that the locking ring and spacer shown in the example may be rearranged to have any pitch, and in addition to the above-mentioned uniform pitch, unequal pitch may also be used. It goes without saying that the arrangement of the annular groove and the locking protrusion may be reversed to that of the embodiment, with the groove formed on the outer surface of the socket and the protrusion formed on the inner surface of the socket. Moreover, although one spacer was provided in the circumferential direction of the lock ring, it goes without saying that multiple spacers may be provided, and various changes and modifications can be made to this invention within the scope of the gist stated in the claims for utility model registration. It is.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal sectional front view of an embodiment of this invention;
Fig. 2 is a vertical sectional side view of the main part, Fig. 3 is an enlarged plan view of the main part, Fig. 4 is an exploded perspective view of the main part, and Fig. 5 is an enlarged perspective view of the main part.
The figure is an enlarged view of the main part showing another example of the socket tip surface, No. 6
The figure is a cross-sectional plan view cut at the screw holes and the holes in FIG. 3, and FIGS. 7 to 9 are drawings corresponding to FIG. 6 showing other embodiments of this invention. 1, 2...tube, 3...socket, 4...insert, 5...
...Annular packing, 7...Annular groove, 8...Lock ring, 9...Locking protrusion, 10...Spacer, 8
a, 8b, 10a, 10b... cutout, 11...
Screw hole, 12... stupid hole, 13... set screw.

Claims (1)

[Scope of utility model registration request] A seal member interposed between the inner surface of the socket of one pipe and the outer surface of the socket of the other pipe, and at least one circumferential seal member installed in an annular groove formed on the inner surface of the socket or the outer surface of the socket. It comprises a split lock ring, a spacer connecting both divided ends of the lock ring, and a locking protrusion formed on the outer surface of the socket or the inner surface of the socket, and prevents the socket from coming out from the socket when engaged with the lock ring. In a pipe joint configured to be blocked by locking with a stop protrusion, both divided ends of the lock ring are provided with notches into which both ends of the spacer adjacent to the divided ends can be fitted in an overlapping manner. A plurality of mounting holes are formed along the circumferential direction of the lock ring in each of the side walls of both ends of the lock ring where the notch is located and the side walls of both ends of the spacer that fit into the notch. The pitch on one end of the spacer in the mounting hole is smaller than the pitch on the one end of the locking ring adjacent to the one end of the spacer, and the pitch on the other end of the spacer is smaller than the pitch on the other end of the locking ring adjacent to the other end of the spacer. Furthermore, the difference between the pitch on one end of the spacer and the pitch on one end of the locking ring is set to be smaller than the difference between the pitch on the other end of the spacer and the pitch on the other end of the locking ring. , a connecting tool between any mounting holes where the mounting holes on one end of the lock ring and the spacer have matching hole surfaces, and between arbitrary mounting holes where the mounting holes on the other end of the lock ring and the spacer have matching hole surfaces. A lock ring in a pipe joint, characterized in that the lock ring is inserted and attached to connect both divided ends of the lock ring and both ends of a spacer.