JP2003021287A - Spigot joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spigot joint preventing a stopper from coming off even when a strong tensile force acts. SOLUTION: A spigot part 21 is provided on one pipe 20 to be connected, and a socket 31 is fixed on the other pipe 30. A groove 25 with which a stopper 60 to be fit in the socket 31 is engaged is formed on outer periphery of the spigot part 21. The stopper 60 is gate-shaped and both end parts are fixed so as to protrude into inner periphery of a pair of cutout grooves 37 formed on peripheral faces on both sides opposing over the pipe center of the socket 31 through the cutout groove 37. The stopper 30 is bent at a part where it crosses the groove 25 of the outer periphery of the spigot part 21 and forms a shape increased in crossed axes angle for the groove 25 by the bent part 63.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a socket formed at one end of a pipe and an insertion portion formed at the other end of the pipe. When the insertion portion is inserted into the socket, the insertion The present invention relates to a spigot joint in which a stopper provided on the socket is fitted and connected to a groove on the outer circumference of the portion.

[0002]

2. Description of the Related Art When connecting pipes to each other, a socket is provided at one end of the pipe, and the other end is used as a plug-in portion. The spigot joints (insulated joints) made in this way can be used, for example, to connect radiator hoses of automobiles.
Widely used for connecting various pipes, hoses and tubes.

As such a spigot joint, for example, in Japanese Unexamined Patent Publication No. 10-9470, an outer peripheral groove is provided on the outer periphery of a female pipe, and a notch groove that penetrates the inner and outer diameters and opposes at a predetermined angle is formed in the outer peripheral groove. Provided, the stopper arm is engaged with the root diameter portion of the non-notched groove portion, each locking arm extending from the stopper arm is bridged and locked in each notched groove, and a part of each locking arm is provided. Discloses a pipe joint projecting into a female pipe and fitted into a groove on the outer periphery of the male pipe.

[0004]

However, in the above-mentioned conventional pipe joint, since the locking arm linearly intersects with the groove on the outer circumference of the male pipe, it does not interfere with the groove on the outer circumference of the male pipe. And intersect at a shallow angle close to the tangent.

Therefore, when a pressurized fluid or the like is passed through the inside of the pipe and a strong tensile force acts on the joint, this tensile force becomes a component force that pushes the locking arm of the stopper outward, and There is a problem that the toe may expand in the outer diameter direction and come off the groove of the male pipe. Particularly, in a joint such as a radiator hose of an automobile, the stopper is easily disengaged due to the vibration of the engine and the radiator.

Therefore, it is an object of the present invention to provide a spigot joint in which the stopper does not come off even when a strong tensile force is applied.

[0007]

To achieve the above object, a first aspect of the present invention comprises a socket formed at one end of a pipe and an insertion portion formed at the other end of the pipe. The socket has a pair of notched grooves provided on the opposite circumferential surfaces facing each other with the center of the tube in between, and stoppers having a generally gate shape are attached, and when the insertion part is inserted into the socket, In a spigot joint in which the stopper fits in a groove on the outer periphery of the insertion portion and connects both pipe ends, the stopper is formed by bending a portion intersecting with the groove on the outer periphery of the insertion portion at both ends forming a gate shape. The present invention provides a spigot joint characterized by having a shape with an increased crossing angle.

According to the above invention, both ends of the stopper,
At the intersection with the groove on the outer periphery of the insertion part, both ends of the stopper are bent to increase the intersection angle, so even if a strong tensile force is applied to the joint, the component force that works in the direction to spread the stopper It becomes smaller and the stopper can be prevented from coming off.

In a second aspect of the present invention, in the first aspect of the invention, the bent portion for increasing the crossing angle of the stopper is a portion that intersects with the groove on the outer circumference of the insertion portion, and is on the end side of the stopper. The present invention provides a spigot joint which is provided only in the portion where it is located.

According to the above invention, the bent portion for increasing the crossing angle of the stopper is provided only at a portion which crosses the groove on the outer periphery of the insertion portion and is located on the end side of the stopper, so that the insertion portion is formed. The opening angle of the stopper when inserting can be made small, and the load at the time of insertion can be kept as small as possible.

In a third aspect of the present invention, in the first or second aspect of the invention, the inner wall on the pipe end side of the cutout groove of the socket and / or the inner wall on the pipe end side of the groove of the insertion portion are provided. And a spigot joint provided with a recess into which the stopper is fitted.

According to the above invention, when a strong tensile force is applied to the joint, the stopper is fitted to the inner wall of the notch groove of the socket on the pipe end side and / or the inner wall of the groove of the insertion portion on the pipe end side. Therefore, the stopper is prevented from expanding and the stopper detachment prevention effect can be further enhanced.

According to a preferred aspect of the present invention, the recess into which the stopper is fitted has a narrow width at a portion where the base side of the stopper abuts, and a wide portion at a portion where both ends of the stopper abut. There is. According to this aspect, the base portion side of the stopper is fitted in the recessed portion having a narrow width, and the both end portions of the stopper are fitted in the recessed portion having a wide width, whereby the bent portions formed on both end portions of the stopper are fitted in the recessed portion. The shape of the recess can be simplified and the molding can be facilitated.

[0014]

1-9 show one embodiment of the spigot joint of the present invention. 1 is an exploded perspective view of the joint, FIG. 2 is a perspective view of the socket of the joint, FIG. 3 is an end view of the socket, FIG. 4 is a side view of the socket, and FIG. 5 is a process of mounting a stopper on the socket. 6 is an explanatory view showing a state in which a stopper is attached to the socket, FIG. 7 is a sectional view showing a state in which the insertion portion is inserted into the socket, and FIG. 8 is a conventional stopper and notch groove. And FIG. 9 is an explanatory view showing an angle formed by the stopper and the notch groove of the same embodiment.

This spigot joint 10 has an insertion portion 21 formed at the end of one pipe 20 to be connected, a socket 31 formed at the end of the other pipe 30, and a socket 3.
1 and a stopper 60 formed of a bending wire.

The insertion portion 21 is formed from the tip tapered portion 22 to
The shape is such that it extends through the straight portion 23 to the enlarged diameter tapered portion 24, and the annular groove portion 25 and the positioning projection 26 are formed on the outer periphery of the top portion of the enlarged diameter tapered portion 24.

The socket 31 is connected to the tube 30 at a predetermined angle, in this embodiment, about 60 degrees.
Further, in this embodiment, the end of the tube 30 on the side opposite to the socket 31 forms a tapered tapered insertion port 32 that is inserted into a hose, a tube, or the like not shown.

In particular, as shown in FIG. 7, the socket 31 is
A first expanded portion 33 having an inner diameter slightly larger than the inner diameter of the insertion port 32 and a second expanded portion 34 slightly expanded from the first expanded portion 33. , And a third expanded diameter portion 35 further expanded from the second expanded diameter portion 34.

The first enlarged diameter portion 33 has the insertion portion 21.
Has an inner diameter into which the tip tapered portion 22 is inserted. The second expanded diameter portion 34 has an annular seal member 3 such as an O-ring.
6 is arranged, and further, a pressing ring 37 for preventing the annular seal member 36 from coming off is inserted.

The enlarged diameter taper portion 24 of the insertion portion 21 and the annular groove portion 25 are arranged in the third enlarged diameter portion 35, and the stopper 60 is fitted into the annular groove portion 25 to prevent the stopper from coming off. It has become. A guide groove 36 into which the positioning protrusion 26 of the insertion portion 21 is inserted is formed in the third expanded diameter portion 35 of the socket 31.

A notch groove 37 into which a stopper 60 is inserted is formed in the third expanded diameter portion 35 of the socket 31.
The notch groove 37 is formed in a slit shape so as to penetrate the inside and outside of the socket 31 along the circumferentially opposed portions of the third expanded diameter portion 35. A bulging wall portion 38 surrounding the guide groove 36 is located in the middle of the pair of slits forming the cutout groove 37.

In the upper half of the cutout groove 37 on the outer periphery of the third expanded diameter portion 35, a rib 39 projecting from the opposite edge of the cutout groove 37.
Is formed, and the stopper 60 is sandwiched so as to be surely held. A concave portion 40 having a V-shaped cross section along the circumferential direction is formed on the end portion side of the socket 31 in the middle portion of the cutout groove 37 on the outer periphery of the third expanded diameter portion 35. Third expanded portion 35
An accommodating recess 41 surrounded by a U-shaped wall for accommodating the end of the stopper 60 is formed at the lower end of the cutout groove 37 on the outer periphery.

The stopper 60 is composed of a wire or the like bent in a gate shape as a whole. At the center of the stopper 60, an outward bent portion 6 that fits the outer circumference of the bulging wall portion 38.
1 is formed. At both ends of the stopper 60, a front bent portion 62 is formed which is bent at an angle of approximately 90 ° toward the insertion port side in the axial direction of the socket 31. Further, an inward bent portion 63 that is bent inward in an arc shape is formed at a portion slightly closer to the base portion from the front bent portion 62.

5 and 6 show a state in which the stopper 60 is attached to the socket 31. That is, when both ends of the stopper 60 are widened and inserted into the notch groove 37 of the socket 31 and covered from above, first, the front bent portion 62 of the stopper 60 is fitted into the V-shaped recess 40 on the outer periphery of the socket 31. It is temporarily held together. When pushed further downward in this state, both ends of the stopper 60 slide while expanding again, and the front bent portion 62 fits into the accommodation recess 41.

At this time, as shown in FIG.
Both end portions of 0 are inserted into the cutout groove 37 of the socket 31, and a part thereof is in a state of protruding inward from the inner circumference of the cutout groove 37, and particularly the inner bent portion 63 largely protrudes inward. At this time, each end of the stopper 60 has a groove 3
Around the circumference of 7 like a string, cutout groove 37 and upper and lower 2
Although intersecting at some points, the inner bent portion 63 is formed at the lower intersecting portion thereof, and no bent portion is provided at the upper intersecting portion.

Next, the operation of the spigot joint 10 will be described. When connecting the pair of pipes 20 and 30,
While inserting the positioning projection 26 into the guide groove 36, the insertion portion 21 of the one tube 20 is inserted into the socket 31 of the other tube 30. Then, the notch groove 37 of the stopper 61
The insertion portion 21 is inserted while the portion protruding inward from the contact portion is pressed against and widened by the enlarged diameter tapered portion 24 of the insertion portion 21. Then, both ends of the stopper 61 are fitted into the annular groove portion 25 of the insertion portion 21, and the one pipe 20 and the other pipe 30 are connected.

The relationship between the stopper 61 and the insertion portion 21 at this time is shown in FIG. That is, 25 in FIG.
Is an annular groove portion of the insertion portion 21, and 27 is an insertion portion 21.
Is a cross-section of the peripheral wall of. Each end of the stopper 61 is inserted into the annular groove 25 of the insertion portion 21, and the annular groove 25
It intersects at two points above and below the outer circumference of.

Of these, in the upper intersection A, each end of the stopper 61 intersects the annular groove 25 in the tangential direction. On the other hand, at the lower intersecting portion B near the end portion of the stopper 61, the annular groove 25 is formed by the inner bent portion 63.
The intersection angle θ with respect to is increased.

On the other hand, an example of using the conventional stopper 80 is shown in FIG. That is, the both ends of the conventional general stopper 80 are linear, and the stopper 80 intersects the annular groove 25 of the insertion portion 21 linearly. As a result, both the upper and lower intersecting portions A and B intersect in the tangential direction, and the intersecting angle θ with respect to the annular groove portion 25 becomes small.

When a tensile force acts between the pair of pipes 20 and 30, the stoppers 60 and 80 are pressed against the inner wall of the annular groove 25, and this pressing force causes the stopper 6 to move.
Component forces F ₁ and F ₂ that push 0 and 80 apart are generated. This component force becomes larger as the crossing angle θ of the stopper with respect to the annular groove portion 25 becomes smaller, so that F ₁ <F ₂ .

That is, the joint of the present invention which uses the stopper 60 in which the crossing angle θ with respect to the annular groove 25 is increased by providing the inner bent portion 63, is different from the joint using the conventional general stopper 80. When a tensile force is applied between the pair of pipes 20 and 30, the stopper is unlikely to spread and is unlikely to come off. Therefore, the pair of tubes 20, 30
Can be connected more firmly.

On the other hand, the inner bent portion 63 of the stopper 60 is
Since it is provided only at the lower intersection B and the upper intersection A intersects in the tangential direction, the insertion load when inserting the insertion portion 21 of the pipe 20 into the socket 31 is not so increased. . That is, the pull-out resistance can be made large without increasing the insertion load as much as possible.

When it is desired to separate the pair of connected pipes 20 and 30 again, the tip of a screwdriver or the like should be attached to the stopper 6.
When inserted into the outer bent portion 61 of 0 and pulling the stopper 60 upward, the stopper 60 opens and slides upward,
The front bent portion 62 engages with the V-shaped groove 40 and is temporarily fixed. In this state, since the stopper 60 does not project from the inner circumference of the cutout groove 37, the insertion portion 21 of the tube 20 can be easily pulled out from the socket 31.

10 and 11 show another embodiment of the spigot joint of the present invention. This spigot joint has basically the same structure as that of the embodiment shown in FIGS. 1 to 9, but has a linear recess 28 on the inner surface of the annular groove 25 of the insertion portion 21 of the pipe 20. The points are different.

This recess 28 is formed in the annular groove 25 of the pipe 20.
Is formed on the inner wall on the tip side of the. Regarding the width of the concave portion 28, the width C of the portion located on the base side of the stopper 60 is reduced and the width D of the portion located on the tip side of the stopper 60.
Has been increased. That is, the width C of the portion of the stopper 60 located on the base side is set to a width that allows the line width of the stopper 60 to be adapted, and the width D of the portion of the stopper 60 located on the tip side is the bent portion 63 of the stopper 60. The width is such that can be inserted. As a result, the shape of the recess 28 is simplified to facilitate molding and the stopper 60 is held without rattling.

According to this embodiment, the pair of tubes 20, 3
The tensile force acts on 0, the stopper 60 of the annular groove 25,
When pressed against the inner wall on the tip side of the pipe 20, the recess 28
The stopper 60 can be more surely prevented from being spread out and coming off.

12 and 13 show another embodiment of the spigot joint of the present invention. This spigot joint is basically the same as that of the above-mentioned embodiment, except that the projection 29 is provided on the inner wall of the annular groove 25 on the tip side of the pipe 20 instead of the recess 28. In other words, the parts other than the protrusions 29 are recesses. According to this
The structure of the annular groove portion 25 is further simplified, and molding or the like is facilitated.

As a structure for preventing the stopper 60 from opening, as described above, not only the concave portion is provided in the annular groove portion 25, but also with or instead of the concave portion, the socket 3 is provided.
A concave portion into which the stopper 60 fits may be provided on the inner wall of the notch groove 37 of No. 1 on the tip side (insertion side).

[0039]

As described above, according to the present invention,
At the intersection of both ends of the stopper and the groove on the outer periphery of the insertion part, both ends of the stopper are bent and the crossing angle is increased, so even if a strong tensile force acts on the joint, the stopper is spread out. The component force acting in the direction becomes small and the stopper can be prevented from coming off.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a spigot joint of the present invention.

FIG. 2 is a perspective view of the socket of the joint.

FIG. 3 is an end view of the socket

FIG. 4 is a side view of the socket.

FIG. 5 is an explanatory view showing a state in which the stopper is being attached to the socket.

FIG. 6 is an explanatory view showing a state in which a stopper is attached to the socket.

FIG. 7 is a cross-sectional view showing a state where the insertion portion is inserted into the socket.

FIG. 8 is an explanatory view showing an angle formed by a conventional stopper and a notch groove.

FIG. 9 is an explanatory view showing an angle formed by the stopper and the notch groove of the same embodiment.

FIG. 10 is a side view showing the relationship between the annular groove of the insertion portion and the stopper, showing another embodiment of the spigot joint of the present invention.

11 is a sectional view taken along line XI-XI of FIG.

FIG. 12 is a side view showing the relationship between the annular groove of the insertion portion and the stopper, which shows still another embodiment of the spigot joint of the present invention.

13 is a sectional view taken along line XIII-XIII in FIG.

[Explanation of symbols] 10 spigot fittings 20 one tube 21 Insert 24 Expanded taper 25 annular groove 28 recess 29 Projection 30 The other tube 31 socket 37 Notch groove 60 stopper 63 Inner bend

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3J106 AA01 AB01 BB02 BC04 BD01                       BE21 CA02 CA06 EA03 EB06                       EC02 EC07 ED33 EE01 EF05

Claims (3)

[Claims] 1. A socket formed at one end of a pipe and an insertion portion formed at the other end of the pipe, wherein the socket is provided on both circumferential surfaces facing each other across the center of the pipe. When a pair of notched grooves are fitted with stoppers having an overall gate shape, and when the insertion portion is inserted into the socket, the stoppers are fitted into the grooves on the outer periphery of the insertion portion so that both pipe ends are In the spigot joint to be coupled, the stopper has a shape in which a crossing angle is increased by bending portions of the stopper which intersect the groove of the outer periphery of the insertion portion at both ends thereof. 2. The bent portion that increases the crossing angle of the stopper is a portion that intersects with the groove on the outer periphery of the insertion portion,
The spigot joint according to claim 1, wherein the spigot joint is provided only on a portion located on the end side of the stopper. 3. A recess into which the stopper fits is provided on an inner wall of the notch groove of the socket on the pipe end side and / or an inner wall of the groove of the insertion portion on the pipe end side. The spigot joint according to 1 or 2.