JPH0351590Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a connection structure between a bar and a joint, and in particular a connection structure between a bar and a joint that can reliably prevent the bar from coming off from the joint body. Regarding.

(Prior art) As shown in FIG. 14, in the conventional connection structure between a bar and a joint, the inner circumferential surface of the end of the joint body B is annular in order to prevent the bar A, such as a pipe material, from coming off. Tapered surface b
A ring body C having a trapezoidal cross section is attached to the outer periphery of the bar A by being inserted into the joint body B, and the bar A is moved in the drawing direction with respect to the joint body B. Accordingly, the ring body C is caused to bite into the outer periphery of the bar A by the surface pressure of the annular tapered surface b of the joint body B to prevent it from coming off.

(Problem to be solved by the invention) Therefore, as shown in FIG. 15, since the ring body C has a trapezoidal cross section, the tapered outer peripheral surface c of the ring body C in FIG. Since it is in close contact with the annular tapered surface b of the main body B in a face-to-face state, the sliding resistance due to this close contact prevents the ring body C from moving integrally with respect to the movement of the bar A in the drawing direction, and the joint The surface pressure effect of the annular tapered surface b of the main body B is not exerted, and the bar material A
There was a problem in that the biting force of the ring body C into the outer circumferential surface of the joint body B was weak, so that the bar A was not prevented from coming off and was pulled out to the outside of the joint body B when pulled out with strong force.

Furthermore, since the ring body C has a trapezoidal cross section, the surface pressure exerted by the annular tapered surface b of the joint body B is sufficient, and the ring body C sufficiently bites into the outer peripheral surface of the bar A. Even in this state, if the bar A is pulled out with strong force, the ring body C
The rod may be twisted in the pulling direction and reversed by approximately 90 degrees, resulting in the problem that the bar A could be pulled out against the joint body B without being prevented from coming off. Ta.

The present invention has been made in view of the above-mentioned problems, and while an annular groove is formed in the bar, the ring body has a circular cross section with a cutout, and the center side of the joint body of the ring body The ring body can be easily expanded by forming a notch in the bar abutment area in which the central top part of the ring body bites into the annular groove of the bar by pressing the annular tapered surface of the joint body. The outer circumference of the ring body, which has a circular cross section, easily slides against the annular tapered surface of the joint body, which allows the center top of the ring body to slide into the annular groove of the bar. A rod that easily bites into the groove surface and can reliably exert a retaining action, and also prevents the ring body from rolling due to the abutment between the annular groove of the bar and the notch of the ring body, and can securely retain the retainer. The main purpose is to provide a connection structure between materials and joints.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a ring body having a circular cross-section and an occluded portion on the inside of one side or both sides of a cylindrical joint body. At the same time, when moving the bar to the outside of the joint body with the ring body attached to the outer periphery of the bar at the end side portion inside the joint body, the ring body is attached to the outer periphery of the bar. A connection structure between a bar and a joint, in which an annular tapered surface is formed to press the ring toward the surface, and an annular groove is formed on the outer peripheral surface of the bar to engage the ring, the ring having a circular cross section. A notch is formed in the bar abutment area on the center side of the joint body in such a shape that the center side top part of the ring body bites into the annular groove of the bar by pressure of the annular tapered surface of the joint body. did.

(Function) According to the above configuration, the bar is inserted into the joint body and the ring body is installed in the annular groove on the outer periphery of the bar within the joint body, and then the bar is moved in the pulling direction. Then, when the outer periphery of the ring body comes into contact with the annular tapered surface inside the joint body and is pressed, the central top of the notch of the ring body touches the groove surface of the annular groove on the outer periphery of the bar. This prevents the bar from coming off against the joint body.

Since the ring body has a circular cross section, the outer circumference of the ring body easily slides against the annular tapered surface of the joint body, and is pressed strongly to the groove surface of the annular groove of the bar material. The center side top part of the ring body tends to bite into the ring body.

Furthermore, the ring body is difficult to roll due to the contact between the annular groove of the rod and the notch of the ring body.

(Example) Hereinafter, the insertion joint according to the present invention will be described with reference to the example shown in the drawings.

As shown in FIG. 2, the insertion joint according to the present invention has an annular flange 11 projecting inwardly at the center in the longitudinal direction, and an annular recess for fitting a rubber sealing member outside the flange 11. The substantially cylindrical stainless steel joint body 1 has a small flange 16 projecting inward at both ends thereof, and has a cutout on the inside of both sides, and the inner diameter is made of a bar material (in this example, A ring body 2 whose outer diameter is slightly smaller than the outer diameter of the tube material A (hereinafter referred to as tube material A) is disposed, and the annular recess is located on the side of the ring body 2 and inside the central portion of the joint body 1. A movement prevention part 13 is provided at the boundary between the ring body 2 and the joint body 1 to prevent the ring body 2 from moving toward the center of the joint body 1. Main body 1
The inner surface of the outer portion is formed into an annular tapered surface 14 whose diameter decreases toward the outside, and the ring body 2 attached to the metal tube A is attached to the annular tapered surface 14 to prevent the movement of the tube as the tube moves toward the insertion side. When the ring body 2 is moved to the side 13, apertures 15, 15 are provided on the front side of the ring body 2 and near the outside of the joint body, and are open to the outside for inserting a ring body removal tool. It is something that

The annular tapered surface 14 allows the ring body 2 to be opened and expanded on the movement prevention portion side when the tube material A is inserted into the joint body 1 and the ring body 2 is attached to the outer periphery of the tube material A. The ring body 2 is formed to have a tapered inner diameter that presses the ring body 2 toward the outer circumferential surface of the tube material A on the outer end side of the joint body. That is, the annular tapered surface is formed so that the end portion of the joint main body 1 has a smaller diameter than the outer circumferential diameter of the ring body 2 attached to the outer circumference of the tube material A, while the movement preventing portion 1
3 is formed to have a larger diameter than the outer circumferential diameter of the ring body 2.

Further, an annular groove a to which the ring body 2 is engaged is formed at a predetermined location on the outer peripheral surface of the tube material A,
On the other hand, the pipe material A on the center side of the joint body of the ring body 2
A notch 2a is formed in the abutment area so that the center-side top portion 21a of the ring body 2 bites into the annular groove a of the tube material A by the annular taper surface pressure of the joint body 1. As shown in the figure, the notch 2a is cut by a predetermined dimension from the central top portion 21a of the ring body 2 toward the center in the radial direction, and is attached to the pipe material A from a predetermined location in the axial direction, that is, the joint body 1. It has a shape in which a horizontal cut is made toward the center and the cut portion is removed. On the other hand, as shown in FIG. 1, the annular groove a formed on the outer periphery of the tube material A is formed into an annular tapered surface s, s that gradually becomes shallower from the deepest part o toward both sides of the tube material A in the axial direction, The deepest portion o is formed in an arcuate shape concave toward the center of the tube material A. Then, the notch 2 of the ring body 2
The ring body 2 is attached to the annular groove a of the tube material A so that the center side apex 21a, which is the tip of the ring a, comes into contact with the central side surface of the joint body 1 at the deepest part o of the arc shape. be. Note that the notch 2a provided in the retaining member 2 may be an annular notch that extends around the entire circumference of the retaining member 2, or may be cut in the axial direction at multiple locations in the circumferential direction of the retaining member 2. It may be formed into a dropped circular arc shape when viewed from the side or a protruding shape when viewed from the side.

Further, the rubber sealing member 3 fitted into the annular recess 12 of the joint body 1 has an axial end face 3a closer to the center of the joint body 1 and an end face 3b closer to the end of the joint body 1, as shown in the figure. , annular cut recesses 31 and 32 are formed in both axial ends of the sealing member 3 to open and expand toward the center and outside due to the fluid pressures of the internal fluid and external fluid, respectively, and the joint body 1
The tongue portion 33 formed by the annular cut recess 31 on the center side of the member is formed in a shape that tapers from the base to the tip and protrudes toward the center of the member. A tongue portion 34 formed by the annular notch recess 31 on the side closer to the end of the main body 1 and on the center side of the member,
The inner diameter of the end edge thereof is slightly smaller than the outer circumferential diameter of the tube material A, and it is formed into a shape having an appropriate width and thickness. Further, on the inner circumferential surface of the sealing member 3, a small annular projection 35 having a semicircular arc cross section and projecting inward is provided at approximately the center in the axial direction.

With the above configuration, when the tube A is inserted from one side of the joint body as shown in FIGS. 2 to 5, the ring body 2 is pushed by the tip of the tube A and moves toward the center of the joint body 1. However, the movement of the ring body 2 is prevented by the movement prevention portion 13, and when the tube A is further inserted, the ring body 2 is expanded and attached to the outer periphery of the tube A.

Then, after the tube material A is fully inserted into the joint body 1, when the tube material A is moved in the pulling direction,
As the tube material A moves, the ring body 2 attached to the outer periphery of the tube material A also moves toward the end of the joint body 1, but when it moves by a certain width, the outer circumferential surface of the ring body 2 comes into contact with the annular tapered surface 14. When the tube material A is further moved in the drawing direction, the ring body 2 is pressed toward the outer peripheral surface of the tube material A by the annular tapered surface 14, so that the ring body 2 cannot be moved further toward the end of the joint body 1. At the same time, due to the pressing force, the center-side top portion 21a of the ring body 2 bites into the groove surface of the annular groove a on the outer peripheral surface of the tube material A, so that the movement of the tube material A is also prevented and is held in place.

Further, since the notch 2a of the ring body 2 is in contact with the starting end of the annular groove a of the tube material A on the center side of the joint body, the ring body 2 does not roll.

Furthermore, when removing the tube material A, as shown in FIG. is the movement blocking portion 13
Insert the ring body removal tool B into the opening 15 to prevent the ring body 2 from moving toward the end of the joint body 1, and then remove the pipe material A. When pulled out, the ring body 2 is prevented from moving toward the end of the joint body 1 by the removal tool as described above, so the ring body 2 is on the movement prevention portion 13 side of the annular tapered surface 14. As the ring body 2 expands and becomes loosely attached to the outer periphery of the pipe material A, the ring body 2
The pipe material A is easily pulled out and removed while being placed in a position between the removal tool B and the movement blocking part 13.

Thus, according to the invention, in particular, the tube material A
An annular groove a into which the ring body 2 is engaged is formed at a predetermined location on the outer circumferential surface of the ring body 2, and a center-side top portion of the ring body 2 is formed at a contact portion of the pipe material A on the center side of the joint body of the ring body 2. 21a is an annular groove a of the tube material A;
A notch 2a is formed in the shape of the annular tapered surface of the joint body 1 to bite into it, and as shown in the figure, the notch 2a is located radially toward the center from the center top 21a of the ring body 2. It has a shape in which a predetermined dimension is cut toward the joint body 1 from a predetermined point in the axial direction, that is, when it is attached to the pipe material A, a horizontal cut is made toward the center of the joint body 1, and this cut portion is cut out and removed. As shown in FIG. 1, the annular groove a formed on the outer periphery of the tube material A is formed into an annular tapered surface s, s that gradually becomes shallower from the deepest part o toward both sides of the tube material A in the axial direction, and The deepest part o is formed in an arcuate shape concave toward the center of the tube material A, and
The ring body 2 is inserted into the annular recess of the tube material A so that the center side apex 21a, which is the tip of the notch 2a of the ring body 2, comes into contact with the central side surface of the joint body 1 at the deepest part o of the arc shape. Since it is configured to be installed in the groove a, the pipe material A is inserted into the joint body 1 and the ring body 2 is installed in the annular groove a on the outer periphery of the pipe material A within the joint body 1. Pipe material A
When the outer circumference of the ring body 2 comes into contact with and is pressed against the annular tapered surface 14 inside the joint main body 1, the central top portion 21a of the notch 2a of the ring body 2 is moved in the pulling direction. Said tube material A
It bites into the groove surface of the annular groove a on the outer periphery.

Since the ring body 2 has a circular cross section, the outer circumferential portion of the ring body 2 easily slides on the annular tapered surface 14 of the joint body 1, and accordingly, the notch 2a of the ring body 2 The central top part 21 of
The groove a bites into the groove surface of the annular groove a of the tube material A, and the retaining effect can be reliably exerted.

In addition, in this embodiment, as shown in FIG. 1, the annular groove a is formed in an annular tapered surface s, s that becomes gradually shallower from the deepest part o toward both sides in the axial direction of the tube material A, The deepest part o is formed in an arc-shaped concave shape toward the center of the tube material A, and the center-side apex 21a, which is the tip of the notch 2a of the ring body 2, Since the ring body 2 is configured to be attached to the annular groove a of the tube material A so as to come into contact with the center side surface of the joint body 1 at the deepest part o, the center side top portion 21a of the ring body 2 is Annular groove a of the tube material A
Since it enters the deepest part o of the arc shape and bites in at this part, it is possible to reliably prevent it from coming off.

Moreover, a notch 2a formed in the ring body 2
The shape of the cutout portion 2a is not limited to the shape of the above embodiment, but may also have the shape shown in FIGS. 7 to 11, for example.
can also be applied.

That is, as shown in FIG. 7, the central portion of the joint main body 1 is cut off at a predetermined angle upward from the central top portion 21a of the ring body 2, and this portion is used as the cutout portion 2a.

Moreover, what is shown in FIG. 8 is that the upper part of the ring body 2 is cut diagonally from the central top part 21a of the ring body 2 toward the end of the joint body 1, and then from a predetermined point toward the center of the joint body 1. The notch portion 2a is created by cutting horizontally in the axial direction and removing this portion.

Moreover, what is shown in FIG. 9 is an arc-shaped notch extending from the center side top portion 21a of the ring body 2 to the center side portion of the joint body 1, and this portion is used as a cutout portion 2a.

Moreover, what is shown in FIG. 10 is that a vertical cut is made from the center side top part 21a of the ring body 2 toward the center.
An acute-angled notch is formed by cutting obliquely toward the center side of the joint body 1 from the approximately center portion, and this portion is defined as the notch portion 2a.

Moreover, the one shown in FIG. 11 has a notch 2a similar to the above embodiment, and furthermore,
The end portion of the joint body 1 is cut off at an acute angle from a, and according to the ring body 2 having this shape, the center side top portion 21a easily bites into the groove surface of the annular groove a of the pipe material A, and does not come off. The stopping effect can be reliably exerted.

On the other hand, an annular groove a provided on the outer periphery of the tube material A
The invention is not limited to the above-mentioned embodiments; for example, as shown in FIG. 12, the cross section may be arcuate, or as shown in FIG. 13, the cross section may be tapered toward both sides in the axial direction. Any shape may be used as long as the central top portion 21a of the ring body 2 comes into contact with the groove surface of the annular groove a.

Further, the central top portion 21a of the retaining member 2
is not limited to one part in the axial direction as in each of the above embodiments, but is provided in a plurality of saw blade-shaped parts in the axial direction, and the retaining member 2 has a shape in which the tops thereof are cut out at an acute angle toward the outer circumferential side. It may be formed.

Although spring steel is suitable as the material for the retaining member 2, it is preferable to change the material depending on the material of the bar such as the pipe material.

Note that the insertion joint according to the present invention is not limited to the one in which the pipe material A is removable as in the above embodiment, but can also be applied to one in which the pipe material A is connected to the joint body 1 in a non-removable manner. .

Further, as the pipe material A, not only stainless steel pipes but also steel pipes, cast iron pipes, resin pipes, resin-lined steel pipes, etc. are applicable.

Further, the bar material is not limited to the tube material A of the above embodiment, but a solid bar material may also be used.

(Effects of the Invention) As described above, the present invention has a ring body having a circular cross section at the bar contacting part on the center side of the joint body, and the top of the center side of the ring body being in the annular groove of the bar. Since the notch is formed in a shape that bites into the annular tapered surface of the joint body, the bar is inserted into the joint body and the ring body is inserted into the annular groove on the outer periphery of the bar within the joint body. After mounting, when the bar is moved in the pulling direction, the outer periphery of the ring body comes into contact with and is pressed against the annular tapered surface inside the joint body, and the central side of the notch of the ring body The top part bites into the groove surface of the annular groove on the outer periphery of the bar, thereby reliably preventing the bar from coming off from the joint body.

In addition, since the ring body has a circular cross section, the diameter of the ring body can be easily expanded and the bar material can be easily attached, and the outer circumference of the ring body having a circular cross section can be easily attached to the annular tapered surface of the joint body. Because it is easy to slip, the top of the center side of the ring body easily bites into the groove surface of the annular groove of the bar material, and the slipping prevention effect can be reliably exerted. Due to the contact, the ring body is difficult to roll and can be held securely to prevent it from coming off.

Moreover, as described above, the cost is low because the annular groove is formed in the bar material and the notch is provided in the ring body having a circular cross section.

[Brief explanation of drawings]

Figure 1 is a partially sectional side view of the part where the ring body is attached to the pipe material, which is the main part of the rod-to-joint connection structure according to the present invention, and Figure 2 is the main part of the rod-to-joint connection structure according to the present invention. A partially cutaway exploded perspective view showing the state in which the pipes are connected in the connection structure, Fig. 3 is a partially cutaway side view before the pipe is inserted, and Fig. 4 is a state where the pipe has been inserted with appropriate dimensions. Partially broken side view,
Fig. 5 is a partially cut-away side view of the state in which the pipe material is inserted the most, Fig. 6 is a partially cut-away side view of the state in which the pipe material has been moved in the pulling direction from the state shown in Fig. 5, and Figs. Figure 11 is a partially sectional side view of the main part of a plug-in joint in which a different ring body is attached to a tube material, and Figures 12 and 13 are respectively different examples in which a ring body is attached to a tube material having an annular groove. Fig. 14 is a partially sectional side view of the main part of a plug-in joint;
FIG. 5 is a partially cutaway perspective view of the ring body. A... Bar material (tube material), a... Annular groove, 1...
Joint body, 2...Ring body, 14...Annular tapered surface, 2a...Notch, 21a...Central side top.

Claims (1)

[Scope of utility model registration request] A ring body having a circular cross section and a missing circular portion is disposed inside one side or both sides of the cylindrical joint body, and the ring body is attached to the end portion inside the joint body with a rod. An annular tapered surface is formed that presses the ring body toward the bar's outer circumferential surface when the bar is moved to the outside of the joint body while attached to the bar's outer circumferential surface. A connection structure between a rod and a joint, in which an annular recessed groove is formed to engage the rod and the joint, wherein the ring body having a circular cross section is brought into contact with the rod at the center of the joint body, and the center-side apex of the ring body is connected to the A connection structure for a bar and a joint, characterized in that a notch is formed in the annular groove of the bar, the cutout being cut into by the pressure of the annular tapered surface of the joint body.