JPH0417892Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a joint having a function of preventing a bar inserted into a joint body from coming out.

(Prior art) Conventionally, the connection between a bar and a joint using a retaining member is such that, as shown in FIG. Insert a bar material A such as a pipe material into the
An annular retaining member C having a trapezoidal cross section and a missing circular portion inserted into the joint body B is attached to the outer periphery of the joint body B, and when the bar A is moved in the pulling direction, the joint body B Due to the surface pressure of the annular tapered surface b, the retaining member C bites into the outer periphery of the bar A to prevent it from coming off.

(Problems to be solved by the invention) The conventional connection structure between the bar A and the joint body B is as follows:
Since the retaining force is ensured by the one-turn annular retaining member C, when the bar A is inserted into the joint body B to which the retaining member C is attached as shown in Fig. 12. First, as shown in FIG. 13, the retaining member C is temporarily moved to the enlarged diameter side of the annular tapered surface b, that is, to a position where the retaining force cannot be secured. Therefore, in order to obtain the retaining state in which the retaining member C bites into the outer periphery of the bar A due to the surface pressure of the tapered surface b as shown in FIG. It is necessary to move the and joint body B relative to each other in the axial direction (for example, by pulling the inserted bar A in the pulling direction), and in the unlikely event that the retaining member C bites into the bar A in the state shown in Fig. If it does not follow the stopper part C, the retaining force cannot be secured.

The present invention was developed in view of these circumstances, and it is easy to insert the bar, and when the insertion of the bar is completed, the bar is reliably bitten and the bar is prevented from coming out. The purpose is to provide a fitting that can be used.

(Means for Solving the Problems) The structure of the present invention, which was taken to achieve the above object, is that a movement preventing portion is provided protruding toward the center of the cylindrical joint body into which the bar is inserted. and an outer tapered surface formed on the outer side of the movement prevention part are provided facing each other in the axial direction, and a compression member made of a spiral elastic wire can be compressed in the axial direction. is inserted between the movement prevention portion and a predetermined location near the outer end of the tapered surface in the state, and
When the first winding part of the retaining member is locked to the tapered surface, the inner diameter of the winding becomes smaller than the outer diameter of the bar material, and the retaining member contracts in the axial direction. and when the first winding part is moved to the inner end side of the tapered surface, the inner diameter of the winding is expanded to such an extent that the bar material fits into the first winding part, The inner diameter of the other winding part of the above-mentioned slip-off prevention member is set to a size that is not smaller than the outer diameter of the bar material, and an edge part is formed on the inner surface of the first winding part. .

(Function) In this configuration, when the bar is inserted into the joint body, the end face of the bar hits the first winding part of the retaining member in the initial stage, compressing the retaining member in the axial direction. to deflate. As the retaining member gradually contracts in this way, the inner diameter of the first winding inevitably gradually expands as the first winding moves toward the inner end of the tapered surface due to the contraction. When the inner diameter of the first winding portion becomes equal to or slightly larger than the outer diameter of the bar, the bar is fitted into the first winding portion, and the above-mentioned retaining member made of a spiral elastic member is inserted. expands in the axial direction due to its elastic return force. Then, when the retaining member expands, the diameter of the first winding portion inevitably decreases, and the edge portion of the inner surface of the first winding portion bites into the bar material. Therefore, when the bar moves in the pulling direction, the first winding part of the retaining member whose edge part bites into the bar increases the biting force and moves along with the bar towards the outer end of the tapered surface. As a result of the movement, the first winding portion hits the tapered surface and receives a diameter reducing force, and the edge portion bites into the bar to prevent the bar from coming off.

(Embodiment) FIG. 4 shows a cross section of a joint according to an embodiment of the present invention. In this joint, a cylindrical metal joint main body 4 has an annular flange 5 that protrudes toward the center at the center in the longitudinal direction, and an annular recess formed on both sides of the flange 5. Tokobe 6, 6 and
Small brim portions 7, 7 are formed at both end edges, respectively, and protrude toward the center. Further, in a portion of the joint body 4 outside the recessed portions 6, 6, there are movement blocking portions 8, 8 protruding toward the center, and adjacent to the movement blocking portions 8, 8. Expanded diameter surfaces 9, 9 that extend outward, and annular tapered surfaces 10, 10 that are narrowed outwardly and are formed on the outside of the movement prevention portions 8, 8, sandwiching the expanded diameter surfaces 9, 9, are formed. The movement prevention portion 8 and the tapered surface 10 face each other in the axial direction.

The retaining member 1 is made of an elastic wire such as a stainless steel wire and is formed into a double-wound spiral (three-wound spiral in the illustrated example), and its natural length is indicated by the symbol L in FIG. This retaining member 1 is in a state where it is slightly shorter than its natural length L, specifically, in a compressed state where it can be contracted in the axial direction (i.e., it has a shrinkage allowance in the axial direction) as shown in the right half of FIG. The movement preventing portion 8 and the tapered surface 10 of the joint body 4 are compressed to a certain degree).
and a predetermined location near the outer end of the As shown in the right half of FIG. The winding inner diameter D ₁ (see Figures 1 and 2) is slightly smaller than the outer diameter. When the retaining member 1 contracts in the axial direction and the first winding portion 2A is moved toward the inner end of the tapered surface 10 (that is, toward the expanded diameter side of the tapered surface 10), the width of the contraction corresponds to the width of the contraction at that time. As a result, the inner diameter D ₁ of the winding is expanded to the extent that the bar A is fitted into the first winding portion 2A. This expansion of the diameter of the first winding portion 2A as the retaining member 1 contracts in the axial direction inevitably occurs because the retaining member 1 is formed in a spiral shape. Therefore, the retaining member 1
extends in the axial direction, and the first winding portion 2A forms the tapered surface 1.
When moved to the outer end side of 0 (i.e. diameter reduction side),
The winding inner diameter _D1 of the first winding portion 2A is reduced in accordance with the expansion width at that time. The inner diameter D 2 of the other winding parts 2B and 2C of the retaining member 1 (see Fig. 1) is a dimension that is not smaller than the outer diameter of the bar A, that is, the inner diameter D ₂ of the other winding parts 2B and 2C of the retaining member 1 is a dimension that is not smaller than the outer diameter of the bar A.
The diameter is set to be equal to or slightly larger than the outer diameter of. Further, although this retaining member 1 has a circular cross section, an edge portion 3 is formed on the inner surface only at the first winding portion 2A. This edge part 3 is cut on the vertical line _C1 connecting the top P and the center O as shown in FIG. It is formed by removing portions cut in parallel to the horizontal line _C2 perpendicular to the vertical line _C1 toward the other winding parts 2B and 2C. Note that the inner diameter of the enlarged diameter portion 9 of the joint body 1 is the same as that of the other winding portions 2B of the retaining member 1,
It is set slightly larger than the winding outer diameter of 2C.

A rubber sealing member 1 is provided in the recessed part 6 of the joint body 4.
1 is inserted. This sealing member 11 has an annular notch 12 on both end surfaces 11a and 11b,
By forming 13, tongue portions 14 and 15 are provided. One of the tongue portions 14 is formed so that it becomes thinner toward the tip and protrudes toward the center. The other tongue part 15 becomes thinner toward the tip side, and the inner diameter of its edge is slightly smaller than the outer diameter of the bar A. Furthermore, the sealing member 11
A small protrusion 16 having a semicircular arc cross section and protruding toward the center is formed in an annular shape at the axial center of the inner circumferential surface.

With the above configuration, as shown in FIG.
When inserted into the joint body 4, the end face of the bar A comes into contact with the first winding portion 2A of the retaining member 1 at the initial stage of insertion, compressing the retaining member 1 in the axial direction and causing it to contract. . When the retaining member 1 is gradually contracted in this way, the first winding portion 2A moves toward the inner end of the tapered surface 10 due to the contraction, and the winding inner diameter D ₁ (see Fig. 1) inevitably changes. gradually expands in diameter. Then, when the winding inner diameter D ₁ of the first winding part 2A becomes the same as or slightly larger than the outer diameter of the bar A, the bar A is fitted into the first winding part 2A, and at the same time, the bar A is spirally formed. The retaining member 1 made of an elastic member expands in the axial direction due to its elastic return force. When the retaining member 1 expands, the diameter of the first winding part 2A inevitably decreases, and the edge part 3 on the inner surface of the first winding part 2A bites into the bar as shown in FIG. . Therefore, when the bar A is pulled in the pulling direction from this state and moves in that direction, the first winding part 2 of the retaining member 1, where the edge part 3 bites into the bar A,
A moves to the outer end side of the tapered surface 10 together with the bar A. Due to the movement of the first winding portion 2A at this time, the first
Although the winding portion 2A tries to reduce the diameter, it cannot reduce the diameter because it has already bit into the bar A, and as a result, the biting force increases and it bites into the bar A even more firmly. . When the first winding part 2A moves toward the outer end of the tapered surface 10 in this way, the first winding part 2A hits the tapered surface 10 as shown in FIG. When the bar is about to be pulled out, the first winding part 2A is pushed toward the center by the tapered surface 10 and its diameter is reduced as shown in FIG. Push in to prevent the bar from coming out.

On the other hand, the other winding parts 2B and 2C of the retaining member 1 have the same winding inner diameter _D2 , and the winding inner diameter
Since D ₂ has a larger diameter than the outside diameter of the bar A, if the bar A, which is secured as described above, and the joint body 4 shake due to some reason such as an earthquake, the first In order to prevent the winding parts 2B and 2C from interfering with the bar A and suppressing its swing width to a small extent without inhibiting the action of the winding part 2A to prevent the bar A from coming off, the bar shown in FIG. The flexible angles θ ₁ and θ ₂ of A are suppressed to be small. On the other hand, if it is desired to obtain a desired flexibility angle for the bar A, the inner diameters of the second winding portion 2B and the third winding portion 2C may be set large.

In this example, the rod material A is a resin pipe, a metal pipe,
Although we have explained the case of using resin-clad tubes, etc.
It may also be a solid bar. Particularly when retaining a relatively soft rod material such as a polyethylene resin pipe, the first winding portion 2A of the retaining member 1 is protruded in the shape of a claw as shown in FIGS. 9A and 9B. When formed into a cross-sectional shape having an edge portion 3, a suitable slip-out prevention effect can be obtained.

Further, the present invention is not limited to the retaining member of the above embodiment, and it goes without saying that the retaining members 1, 1 as shown in FIGS. 10A and 10B may be used, for example.

By the way, as mentioned above, when the retaining member 1 is pushed by the bar A and contracts, the diameter of the first winding part 2A will inevitably expand, and the bar A will fit easily into the first winding part 2A. If it fits in, even if the bar A is relatively soft like a polyethylene resin pipe, the outer surface of the bar A will be less likely to be scratched by the edge part 3 when inserted, and the This helps prevent cracks in the bar A and prevents fluid leakage.

(Effects of the invention) According to the invention, when inserting the bar into the joint body, the bar A is easily fitted into the first winding part of the retaining member, and the first winding part When the bar is fitted into the bar, the retaining ring expands with its own elasticity and reduces the diameter of the first winding, so that the first winding reliably bites into the bar. When the bar is about to be pulled out, the first winding part moves steadily together with the bar, and the diameter of the first winding part is reduced by the action of the tapered surface of the joint body, and the edge part bites into the bar. This has the effect of reliably preventing it from coming off.

In addition, since the bar A fits easily into the first winding part of the retaining member as described above, even if the bar is a flexible and easily damaged resin pipe, the first
It has the advantage of being less likely to be scratched by the edges of the winding, which helps prevent cracks in the resin pipe and fluid leakage from the cracks.

[Brief explanation of the drawing]

Fig. 1 is a side view of the retaining member, Fig. 2 is a front view thereof, Fig. 3 is a sectional view of the first winding part of the retaining member, and Fig. 4 is an example of use of the joint according to the embodiment of the present invention. FIG. 5 is a partially cutaway side view showing the state before the bar is inserted, and FIG. 6 is a side view showing the state where the bar is fitted into the first winding of the retaining member and the retaining member is removed. Part 7 is a side view partially cut away showing the state at the time of elongation.
The figure is a partially cutaway side view of the bar moving in the pulling direction, Figure 8 is an explanatory side view showing the bending angle of the bar, and Figures 9A and 9B are examples of modified edges. 10A and 10B are side views showing modified examples of the retaining member, and FIGS. 11 to 13 respectively.
The figure is a partial sectional view for explaining the function of a conventional joint. A... Bar material, 1... Removal prevention member, 3... Edge portion, 4... Joint body, 8... Movement prevention part, 10...
...Tapered surface, 2A...First winding part of the retaining member,
2B, 2C...Other winding parts of the retaining member, _D1 ...
...Inner diameter of the first winding part, _D2 ...Inner diameter of the other winding part.

Claims (1)

[Claims for Utility Model Registration] A cylindrical joint body 4 into which the bar A is inserted has a movement blocking part 8 protruding toward the center thereof, and a movement blocking part 8 formed on the outside of the movement blocking part 8. The movement preventing portion 8 and the tapered surface 10 are provided opposite to each other in the axial direction, and the retaining member 1 made of a spiral elastic wire is compressed so that it can be contracted in the axial direction. The first winding part 2A of the retaining member 1 is sandwiched between the first winding part 1 and the tapered surface 10, and the first winding part 2A of the retaining member 1 When the winding diameter _D1 becomes smaller than the outer diameter of the bar A,
The retaining member 1 contracts in the axial direction and the first winding portion 2A
When the bar material A is moved toward the inner end of the tapered surface 10, the inner diameter of the winding is expanded to the extent that the bar material A is fitted into the first winding portion 2A, and the retaining member is The other winding parts 2B and 2C of the first winding part 2B and 2C are set so that the winding inner diameter _D2 thereof is not smaller than the outer diameter of the bar A, and an edge part 3 is formed on the inner surface of the first winding part 2A. A fitting characterized by: