JPH0642152Y2 - Bar material connection fitting - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a bar connecting joint having a bar retaining function.

[Conventional technology]

FIG. 13 shows a retaining member used to exert a function of retaining a rod in a conventional rod connecting joint. The retaining member C has a circular cutout portion C1 at one position in the circumferential direction, has a trapezoidal cross-sectional shape, has an outer peripheral surface that is a tapered surface C2, and has an edge-shaped protrusion on the edge of the inner peripheral surface. It was composed of a ring-shaped member having a false tooth C3.

FIG. 14 shows an example in which a conventional rod connecting joint is used to connect a rod such as a pipe to the joint body. As shown in the figure,
The retaining member C is arranged between the tapered surface b formed on the joint body B and the outer surface of the bar A inserted into the joint body B, and is sandwiched by both. From this state, the bar A is moved in the pulling-out direction (arrow X), and when the retaining member C moves in the same direction following the movement, the retaining member C abuts the tapered surface b with the movement thereof and the surface pressure thereof is increased. Then, the tooth C3 bites into the outer surface of the bar A to prevent the bar A from coming off.

[Problems to be solved by the device]

However, the conventional retaining member C has a tapered surface C2.
Comes into surface contact with the tapered surface b on the joint body B side, so that it is easy to be obstructed to follow the rod A due to the large frictional resistance generated during sliding. If the taper surface b does not move following the rod A, the surface pressure action by the tapered surface b is not sufficiently exerted and the width of the reduced diameter becomes insufficient.
There was a problem that C3 would not surely bite into the outer surface of the bar A. Further, even when the biting teeth C3 bite into the outer surface of the bar A, if a large force in the pulling direction is applied to the bar A, the taper surface b and the outer surface of the bar A will be separated. There was also a problem in that it was twisted while being sandwiched (twisted around an axis passing through the center of the cross section of the retaining member C) and turned about 90 degrees. In these cases, the retaining function is not sufficiently exerted, and the rod A is easily pulled out from the joint body B.

Further, when the biting tooth C3 is biting on the outer surface of the bar A, even if a large pulling direction force is applied to the bar A, if the retaining member C is not twisted, When the biting tooth C3 tries to bite deeper into the outer surface of the bar A, a very large stress may be locally applied to the biting point of the biting C3 of the bar A. There was a risk that cracks would occur or the bar A would crack.

The present invention has been made in view of the above problems, and twists in the inversion direction of the retaining member that occurs when a large pulling force is applied to the bar (around the axis passing through the center of the cross section of the ring-shaped member). It is possible to exert a reliable retaining action by utilizing the twist of the bar, and furthermore, it is possible to locally apply stress to only one place of the bar by utilizing the twist in the reversing direction. An object of the present invention is to provide a retaining member that can be avoided.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the first invention is that the inner peripheral surface of the end portion is a cylindrical joint body (2) formed on a tapered surface (25) whose diameter gradually decreases toward the outside, or A tubular joint body (2) having a push ring (3) formed on a tapered surface (3b) whose peripheral surface gradually decreases in diameter toward the outside and screwed into an end thereof;
A bar connecting joint provided with the taper surface (25) of the joint body (2) or the retaining member (4) arranged in a space surrounded by the taper surface (3b) of the push ring (3), The stopper member (4) is screwed between the rod (1) and the tapered surface (25) of the joint body (2) into which the rod (1) is inserted or between the rod (1) and the joint body (2). The joint body (2) is arranged between the push ring (3) and the tapered surface (3b) and moves in the pull-out direction of the rod (1) following the rod (1).
Alternatively, the taper surface (25) (3b) formed on the push ring (3) is hit and then twisted while contacting the taper surface (25) (3b) by the movement in the pulling direction following the bar material (1). The retaining member (4), which is deformed to reduce its diameter while being deformed, is provided with an edge-like first biting tooth (4a) at the smallest diameter portion in the natural state. An edge-shaped second biting tooth (4b) is provided at a position displaced from (4a) to the opposite side of the insertion side end of the bar (1), and the first biting tooth (4a) is secondly provided. It is configured to have a smaller diameter than the biting teeth (4b), and these first biting teeth (4a) and second biting teeth (4b)
The contour line of the outer surface excluding the formation part of is partially circular.

The second invention is that the inner peripheral surface of the end portion is a cylindrical joint body (2) formed on the tapered surface (25) whose diameter gradually decreases toward the outer side, or the inner peripheral surface faces toward the outer side. A tubular joint body (2) into which a push ring (3) formed on the tapered surface (3b) having a gradually smaller diameter is screwed to the end, and the tapered surface (25) of the joint body (2), or And a retaining member (4) provided in a space surrounded by the tapered surface (3b) of the push ring (3), the retaining member (4) is the same as the rod (1). Between the taper surface (25) of the joint body (2) into which is inserted, or between the bar material (1) and the taper surface (3b) of the push ring (3) screwed to the joint body (2). The taper surfaces (25) (3b) formed on the joint body (2) or the push ring (3) when the rods (1) are arranged and moved in the drawing direction of the rod (1) following the rod (1). It is composed of a ring-shaped member which contracts and deforms while being twisted while hitting the taper surfaces (25) (3b) due to subsequent movement in the drawing direction following the bar (1), and the retaining member ( 4) is an edge-shaped biting tooth (4a) (4b) at the smallest diameter portion in the natural state and the portion displaced from the smallest diameter portion to the opposite side of the insertion side end of the bar (1), respectively. ), And the biting teeth (4a) on the side closer to the insertion side end of the bar (1) are configured to have a smaller diameter than the biting teeth (4b) on the side farther from them. It is said that the contour line of the outer surface excluding the formation points of the false teeth (4a) (4b) is partially elliptical.

A third invention is that the inner peripheral surface of the end portion is a cylindrical joint body (2) formed on the tapered surface (25) whose diameter is gradually reduced toward the outer side, or the inner peripheral surface is directed toward the outer side. A tubular joint body (2) into which a push ring (3) formed on a tapered surface (3b) having a gradually smaller diameter is screwed to an end thereof, and the tapered surface (25) of the joint body (2), or And a retaining member (4) provided in a space surrounded by the tapered surface (3b) of the push ring (3), the retaining member (4) is the same as the rod (1). Fitting body (2)
Of the rod (1) and the tapered surface (3b) of the push ring (3) screwed to the joint body (2). When moving in the pull-out direction of the bar (1) following the movement, the joint body (2) or push ring (3)
The taper surface (25) (3b) formed on the surface is hit, and then the movement in the pulling direction following the bar (1) causes a diameter reduction deformation while twisting while hitting the taper surface (25) (3b). The retaining member (4) has a non-circular cross-section, has a plurality of edge-shaped biting teeth (4a) (4b) on the inner peripheral surface thereof, and has a bar ( The biting tooth (4a) on the side closer to the insertion side end of 1) is configured to have a smaller diameter than the biting tooth (4b) on the side farther from it, and further comes into contact with the tapered surface (25) (3b). The part is formed in a convex curved shape.

[Action]

In the rod connecting device of the first invention, when the rod is moved in the pulling direction in a state where the retaining member is arranged between the rod and the tapered surface of the joint body by inserting the rod into the joint body, , The retaining member moves to follow the rod and hits the tapered surface of the joint body, and subsequently moves in the pulling direction to follow the rod, causing diameter reduction deformation while twisting while contacting the tapered surface. The biting teeth bite into the outer surface of the bar, and when the bar is subjected to a small force in the pulling direction, the retaining action is exerted only by the first biting teeth. At this stage, the pulling force applied to the bar is small, so even if stress concentrates on the biting point of the first bite, there will be no cracks or cracks in the bar and only the first bite. Since the second biting teeth do not come into contact with the outer surface of the bar, the number of biting scratches on the bar can be minimized.

Although the second bite does not come into contact with the outer surface of the bar member in the initial stage of twisting the retaining member in this manner, when the retaining member is further twisted, the second retaining tooth of the second retaining tooth is also rotated.
The bite hits the outer surface of the bar. Even if the bar material is further moved in the pulling-out direction after that, the second biting teeth hit the outer surface of the bar material and are stretched to prevent the twisting of the retaining member, and at the same time, the first biting tooth and the second biting bite. Both of the teeth bite into the outer surface of the bar and these biting teeth resist a large pulling force on the bar, ensuring that the bar is retained. Since both the first and second biting teeth bite into the outer surface of the bar, the stress applied to the bar by the retaining member causes the stress to be applied to the biting point of the first biting tooth and the first bit. Since it is dispersed at the biting points of the two biting teeth, it is difficult for the stress applied to each biting point to cause cracks or cracks in the bar.

Further, when the bar material is inserted into the joint body, the diameter of the first biting teeth of the retaining member is smaller than that of the second biting teeth, so that the first biting teeth are formed on the outer surface of the bar material. Since the second bite does not hit, the bar is only scratched by the first bite at most, and it can be said that the outer surface of the bar is not easily scratched.

The above operation is also exhibited in the bar connecting joint provided with the joint body into which the push ring is screwed. That is, in this structure, the tapered surface of the push ring exhibits the same action as the tapered surface of the joint body described above.

The same effects are exhibited by the bar connecting joints of the second and third inventions. In the second and third inventions, the biting teeth closest to the insertion side end portion of the bar member in the retaining member correspond to the first biting teeth of the first invention, and the biting teeth adjacent to the first biting tooth. Corresponds to the second biting tooth of the first invention.

〔Example〕

FIG. 3 is a partial cross-sectional view showing an embodiment in which the first invention is applied to a rod-shaped connecting joint that does not use a push ring, and FIG. 4 is a sectional view of the rod-shaped connecting joint in which the rod 1 is inserted. FIG. 5 is a partial cross-sectional view showing a stage in the middle of moving, FIG. 5 is a partial cross-sectional view showing a state where the bar 1 is completely inserted into the joint body 2, and FIG. 6 is a bar 1
FIG. 6 is a partial cross-sectional view showing a state in which the stopper is retained.

The joint body 2 is made of metal or synthetic resin and has a tubular shape, and an annular collar portion projecting inward at the center in the longitudinal direction thereof.
21, a ring-shaped recess 22 formed in the vicinity of both ends, and a small flange portion 23 formed on both end opening edges and protruding inward, and the recess 22 has a rubber sealing member 5 Are held in a fitted state. The inner peripheral surface between the annular rib 24 and the small collar portion 23 forming the wall portion of the recess 22 is formed into a tapered surface 25 having a diameter gradually decreasing toward the outside.
A retaining member 4 is provided in a space surrounded by 25. The maximum diameter of the tapered surface 25 is equal to or larger than the outer diameter of the retaining member 4 in a natural state (a state in which the diameter is not reduced or twisted), and the minimum diameter is the outside of the retaining member 4 in the natural state. The width is set to be smaller than the diameter, and the width thereof has a dimension that allows the retaining member 4 to move in the axial direction. Also,
The inner diameter of the retaining member 4 in the natural state is close to the outer diameter of the bar 1. Reference numeral 26 is a hole formed at the end of the joint body 2.

The retaining member 4 is composed of a contour member having a circular cutout portion at one position in the circumferential direction, which allows the diameter reduction deformation from the natural state. Then, as shown in detail in FIGS. 1 and 2, an edge-shaped first biting tooth 4a is provided at the smallest diameter portion in the natural state,
An edge-shaped second biting tooth 4b is provided in a stepped manner at a portion displaced from the first biting tooth 4a to the opposite side of the insertion side end portion of the bar 1, and the first biting tooth 4a is provided. The diameter is smaller than that of the second biting teeth 4b, and the first biting teeth 4a and second
The contour line of the outer surface excluding the formation portion of the biting tooth 4b is formed in a partial circle. Such a retaining member 4 has a notch portion adjacent to each other on the inner side of a ring-shaped member having a regular circular cross section.
It can be easily manufactured by forming 4c and 4d.

Next, a case where the bar 1 is connected to the joint body 2 will be described.

When the rod 1 is inserted into the joint body 2 from the state of facing the joint body 2 as shown in FIG. 3, for example, the tip of the rod 1 pushes the retaining member 4 and retracts until it hits the rib 24. When the rod 1 is further inserted later, the retaining member 4 is forcibly expanded and held in a state of being wound around the rod 1. At this time, the first biting teeth 4a are formed on the outer surface of the bar 1.
Since only the first biting teeth 4a contact each other and the second biting teeth 4b do not contact each other, even if the outer surface of the bar member is scratched, it is only the scratches by the first biting teeth 4a, and the scratching is suppressed to the minimum.

As shown in FIG. 4, the tip of the rod 1 is inserted into the sealing member 5 during the insertion of the rod 1, and the tip of the rod 1 hits the flange 21 when the rod 1 is completely inserted. Alternatively, as shown in FIG. 5, it is inserted up to the vicinity of the collar portion 21.

When the rod 1 is completely inserted, as shown in FIG. 5, the first biting tooth 4a of the retaining member 4 is in contact with the outer surface of the rod 1, but the second biting tooth 4b is It does not contact the outer surface of the bar 1. That is, the second biting teeth 4b are arranged so as to float above the outer surface of the bar 1.

After the rod 1 is completely inserted as shown in FIG. 5, when the rod 1 is pulled back in the pulling-out direction (arrow X in FIG. 6), the retaining member 4 held by the rod 1 together with the rod 1. Pulled back in the same direction, the partial circular (arc-shaped) outer surface of the retaining member 4 abuts the tapered surface 25 and then slides with the tapered surface 25, or the sliding is blocked by the tapered surface 25. In the state, only the contact point with the bar 1 is pulled back and twisted a little. At this stage, the retaining member 4 is reduced in diameter while being twisted by the surface pressure of the tapered surface 25, and the first biting teeth 4a bite into the outer surface of the bar 1 to prevent the bar 1 from coming off. The denture 4b remains floating from the outer surface of the bar 1. FIG. 1 illustrates a state in which the first biting teeth 4a bite into the outer surface of the bar 1 to prevent the bar 1 from coming off.

If the rod 1 is thus prevented from coming off, even if a force in the pulling direction is applied to the rod 1, the rod 1 is less likely to be pulled out from the joint body 2, but if the force is very large, When the bar 1 is further pulled in the drawing direction X from the state shown in FIG.
Is twisted and reduced in diameter as shown by arrow Y in FIG.
As shown in the drawing, the second biting teeth 4b hit the outer surface of the bar 1 and bite it. The reason why the retaining member 4 is twisted in this manner is that the retaining member 4 cannot be pulled back following the rod 1 because the outer surface of the retaining member 4 hits the tapered surface 25. This is because the first biting tooth 4a bites into the outer surface of the bar 1 and thus the bar 1 cannot slide on the retaining member 4. Second as above
When the biting teeth 4b bite into the outer surface of the bar 1, the second biting teeth 4b cooperate with the first biting teeth 4a to reliably prevent the bar 1 from coming off, and at the same time, the second biting teeth. The urging action of 4b prevents the retaining member 4 from reversing further, and a reliable retaining action is exhibited by both the first and second biting teeth 4a and 4b. In this way, the first biting teeth 4a and the second biting teeth 4b are respectively provided at the two positions on the outer surface of the bar material 1.
When and bite into each other, the stress applied to the bar 1 by the retaining member 4 is distributed to two places, the bite point of the first bite tooth 4a and the bite point of the second bite tooth 4b. Therefore, not much stress is applied to each bite point. Therefore, there is little possibility that the bar 1 is cracked or the bar 1 is broken.

Moreover, according to what is shown in the drawing, the bar 1 connected to the joint body 2 can be easily pulled out from the joint body 2. That is, as shown in FIG. 6, the bar member 1 which is prevented from coming off by the retaining member 4 is once pushed into the joint body 1 to retract the retaining member 4 to the position where it comes into contact with the rib 24 as shown in FIG. Then, the diameter of the retaining member 4 is expanded to the original diameter, a rod-shaped tool D is inserted into the hole 26 as shown by an imaginary line in the figure, and the tool D is positioned in front of the retaining member 4, Next, when the bar 1 is pulled out, the retaining member 4
Since the tool D prevents the rod 1 from following the rod 1, the rod 1 is pulled out from the retaining member 4 and the joint body 2.

FIG. 7 is a partial sectional view showing an embodiment in which the first invention is applied to a bar connecting joint equipped with a push ring, and FIG. 8 is a bar main body 2 of such a bar connecting joint in which the bar 1 is retained. It is sectional drawing when it is connected in the closed state. The joint body 2 is made of metal or synthetic resin and has a tubular shape, and has male screw portions 2a on the outer surfaces of both axial end portions, and the inner peripheral surfaces of the both end portions gradually contract inward in the axial direction. It is formed on the taper surface 2b which has a gradually increasing diameter. The push ring 3 is made of metal or synthetic resin, the female screw portion 3a of which is screwed into the male screw portion 2a, and the inner peripheral surface thereof has a taper surface having a gradient opposite to that of the taper surface 2b.
That is, the tapered surface 3b is formed so that its diameter gradually decreases toward the outside. A sealing member 5 made of, for example, hard rubber and having elasticity is fitted to the end of the joint body 2, and a retainer 6 is provided on the front surface of the sealing member 5. The retaining member 4 is provided in the space surrounded by the tapered surface 3b of the push wheel 3.

In the above-mentioned configuration, the push wheel 3 is loosened and the rod 1 is pushed by the push wheel 3,
From the state where it is inserted into the retaining member 4 and the joint body 2,
When tightening, the sealing member 5 compressed by the push ring 3 via the retainer 6 comes into pressure contact with the bar 1, and the tapered surface 3b of the push ring 3 makes a line contact with the outer surface of the retaining member 4 to reduce the diameter. Then, as shown in FIG. 7, the first biting teeth 4a bite into the outer surface of the bar 1 to prevent it from coming off. When the rod 1 is pulled from this state with a strong force and moves in the pulling-out direction, the retaining member 4 is twisted and its diameter is reduced in accordance with the movement, and the rod 1 is added to the first biting tooth 4a as shown in FIG. The second bite 4b is also a bar 1
The first biting tooth 4a and the second biting tooth 4b cooperate with each other to prevent the bar 1 from coming off and the second biting tooth.
The retaining action of 4b prevents the retaining member 4 from being further twisted. Also in this case, the stress applied to the bar 1 is distributed to the biting part of the first biting tooth 4a and the biting part of the second biting tooth 4b, so that only one part of the bar 1 has a stress. The bar 1 is securely retained without applying a large stress.

The retaining member 4 of the first invention may have a structure other than that described above. FIG. 9 (A)-
A modified example of the retaining member 4 is illustrated in (H). 9 (A), (E) and (G) show the first biting teeth 4a juxtaposed over two rows, and FIG. 9 (B) shows the first biting teeth 4a over four rows of saw teeth. In the same figure, (F) and (H) are the ones in which the first biting teeth 4a are juxtaposed over three rows, and the ones in (A) and (B) are PVC pipes. It is suitable when In the same figure (C), the front portion of the first biting tooth 4a is obliquely cut away, and the biting width of the first biting tooth 4a becomes large, which is suitable when the steel pipe is a bar material. . In the same figure (D), the front part of the first biting tooth 4a and the rear part of the second biting tooth 4b are obliquely cut away, and the first biting tooth 4a and the second biting tooth 4b are bited. When the width becomes large and the resin coated steel pipe is a bar material, the first biting teeth 4a and the second biting teeth are used.
4b penetrates through the resin coating layer and surely cuts into the bare metal part of the steel pipe. It should be noted that each of these retaining members 4 should be used properly according to the material and type of the bar material (tube or the like).

FIG. 10 shows a cross-sectional shape of the retaining member 4 used in the bar connecting joint according to the embodiment of the second invention. As is clear from the figure, a plurality of the retaining members 4 are arranged at the smallest diameter portion in the natural state and at the portion displaced from the smallest diameter portion to the opposite side of the insertion side end of the bar 1 (in the example shown in the figure). 2) edge-shaped biting teeth 4a and 4b, and the biting tooth 4a on the side closer to the insertion side end of the bar is configured to have a smaller diameter than the biting tooth 4b on the far side. The contour line of the outer surface excluding the formation points of these biting teeth 4a, 4b is partially elliptical. The biting teeth 4a and 4b correspond to the first biting tooth 4a and the second biting tooth 4b, respectively, and their actions are also the same. It should be noted that the retaining member 4 shown in FIG. 10 is arranged between the rod and the tapered surface of the tubular joint body into which the rod member is inserted, or the tapered surface of the push ring screwed to the joint body, As in the case of the first invention described above, a ring-shaped member which deforms while being twisted by hitting a tapered surface formed on the joint body or the push ring when the rod is moved in the pulling-out direction following the rod, Is.

11 and 12 show the usage state of the retaining member 4 according to the embodiment of the third invention. The retaining member 4 has a non-circular cross section and has a plurality of edge-shaped biting teeth 4 on the inner peripheral surface.
The second biting tooth 4b is provided with a, 4b, 4c, and the biting tooth 4a provided at the insertion side end of the bar material is adjacent to this.
The diameter of the second biting tooth 4b is smaller than that of the third biting tooth 4c. Further, the portion 4d that comes into contact with the joint body or the tapered surface 25 (3a) on the push ring side is formed in a convex curved surface shape. The first tooth 4a mentioned above
And the second bite 4b are the first bite described above, respectively.
4a and second biting teeth 4b, and their actions are the same. In the state where such a retaining member 4 is arranged as shown in FIG. 11 between the tapered surface 25 of the joint body 2 and the rod 1 inserted into the joint body 2, the arrow X in FIG. When the bar 1 is pulled and moved in the pulling direction as shown,
The retaining member 4 held by the rod 1 moves in the same direction as the rod 1, and the portion 4d having the convex curved surface hits the taper surface 25 and is deformed while being twisted. Therefore, the first bite
4a bites into the outer surface of the bar 1 to prevent the bar 1 from coming off.
Then, the bar 1 is pulled more strongly and the pulling direction X
When further moving to, the retaining member 4 is twisted and the diameter is reduced,
As shown in FIG. 12, in addition to the first tooth 4a, the second tooth 4b bites into the outer surface of the bar 1 and
4a and 4b work together to prevent the bar 1 from coming off. Further, the second tooth 4b also serves to prevent the retaining member 4 from being twisted any further. The third biting tooth 4c bites into the outer surface of the bar 1 to prevent it from coming off when the bar 1 is pulled more strongly, and at the same time prevents the retaining member 4 from being further twisted. Therefore, the third tooth 4c serves as an auxiliary tooth of the second tooth 4b. The same applies when the retaining member 4 is provided on the push ring 3 instead of the joint body 2. Also in this case, the bar 1 is reliably pulled out without a large local stress being applied to the bar 1.

[Effect of device]

According to the bar connecting joint of the first invention, when the force applied to the bar in the pulling direction is not so large, only the first biting tooth of the retaining member bites the outer surface of the bar and pulls out the bar. When stopped, the second biting teeth are lifted from the outer surface of the bar and do not contact the bar. When the force is large, the retaining member is twisted as the rod moves in the pulling-out direction, and not only the first biting tooth but also the second biting tooth hits the outer surface of the rod and bites the second bite. The dentures stretch against the outer surface of the bar to prevent further twisting of the retaining member,
At the same time, there is an effect that the bar material is reliably prevented from coming off by the cooperation of the first and second biting teeth. Therefore,
If a situation in which cracking or cracking may occur at the biting point if the bar material is retained only by the first biting tooth, both the first biting tooth and the second biting tooth are Since the stress that bites into the outer surface and is applied to the bar material is distributed to the biting points of the first biting teeth and the biting points of the second biting teeth, the stress at each biting point is suppressed to a low level. There is less risk of cracks in the material. Therefore, it is possible to achieve the intended purpose of exhibiting a reliable retaining action and avoiding locally applying a stress that causes a crack or break in the bar.

Further, when the bar material is inserted into the joint body, the diameter of the first biting teeth of the retaining member is smaller than that of the second biting teeth, so that the first biting teeth are formed on the outer surface of the bar material. Since the second biting tooth does not hit, the bar material is only scratched by the first biting tooth at most, so that the outer surface of the bar material is less likely to be scratched.

Similar effects can be achieved by the second and third devices.

[Brief description of drawings]

1 and 2 are enlarged cross-sectional views for explaining the action of the retaining member used in the rod connecting device according to the embodiment of the first invention, and FIG. 3 is a rod connecting without using a push ring. Partial sectional view of an embodiment in which the first invention is applied to a joint, FIG. 4 is a partial sectional view showing a stage in the middle of inserting a rod into a joint body, and FIG. 6 is a partial cross-sectional view showing a state in which the rod is inserted into the rod, FIG. 6 is a partial cross-sectional view showing a state in which the rod is retained, and FIG. 8 is a partial sectional view showing
The figure is a cross-sectional view when the bar is connected to the joint body of such a bar connecting joint in a state where the bar is retained, and FIGS. 9 (A) to (H) show the bar connecting of the first invention. FIG. 10 is an end view showing a modified example of the retaining member used in the joint, FIG.
FIG. 11 is an end view showing the cross-sectional shape of the retaining member used in the rod connecting joint of the invention, and FIGS. 11 and 12 are enlarged views showing the usage state of the retaining member used in the rod connecting joint of the third invention. A sectional view, FIG. 13 is a partially cutaway perspective view of a retaining member used in a conventional rod connecting joint, and FIG. 14 illustrates the action of the retaining member used in a conventional rod connecting device. It is sectional drawing for doing. 1 ... Rod, 2 ... Joint body, 3 ... Push ring, 3a ... Push ring taper surface, 4 ... Preventing member, 4a ... First bite (bite tooth), 4b ... No. 2 biting teeth (biting teeth), 4d ...
… Parts that come into contact with the tapered surface, 25 …… Tapered surface of the joint body, X …… Drawing direction of the bar.

Continuation of the front page (56) References JP-A-48-42811 (JP, A) Actual opening 59-54281 (JP, U) Actual opening Sho-51-108116 (JP, U) Actual public Sho-53-11366 (JP , Y2)

Claims (3)

[Scope of utility model registration request] 1. A tubular joint body (2) formed on a tapered surface (25) whose inner peripheral surface at the end portion gradually decreases in diameter toward the outside, or whose inner peripheral surface gradually extends toward the outside. A tubular joint body (2) into which the push ring (3) formed on the tapered surface (3b) having a small diameter is screwed to the end, and the tapered surface (25) of the joint body (2), or In a rod connecting joint comprising a retaining member (4) arranged in a space surrounded by the tapered surface (3b) of the push ring (3), the retaining member (4) includes the rod (1) and the retaining member (4). Between the tapered surface (25) of the joint body (2) to be inserted or between the rod (1) and the tapered surface (3b) of the push ring (3) screwed to the joint body (2). The tapered surface (25) (3b) formed on the joint body (2) or the push ring (3) when the rod (1) moves in the pulling-out direction following the rod (1). It consists of a ring-shaped member that contracts and deforms while being twisted while hitting the tapered surfaces (25) (3b) due to the subsequent movement in the drawing direction following the bar (1), and the retaining member (4 ) Is the edge-shaped first part on the smallest part in the natural state.
Equipped with a biting tooth (4a), and an edge-shaped second biting tooth (4b) at a position displaced from the first biting tooth (4a) to the opposite side of the insertion side end of the bar (1). In addition, the first biting tooth (4a) has a smaller diameter than the second biting tooth (4b),
A bar material connecting joint, characterized in that the contour line of the outer surface excluding the formation points of the first biting teeth (4a) and the second biting teeth (4b) is partially circular. 2. A cylindrical joint body (2) formed on a tapered surface (25) whose inner peripheral surface at the end portion gradually decreases in diameter toward the outside, or the inner peripheral surface gradually extends toward the outside. A tubular joint body (2) into which the push ring (3) formed on the tapered surface (3b) having a small diameter is screwed to the end, and the tapered surface (25) of the joint body (2), or In a rod connecting joint comprising a retaining member (4) arranged in a space surrounded by the tapered surface (3b) of the push ring (3), the retaining member (4) includes the rod (1) and the retaining member (4). Between the tapered surface (25) of the joint body (2) to be inserted or between the rod (1) and the tapered surface (3b) of the push ring (3) screwed to the joint body (2). The tapered surface (25) (3b) formed on the joint body (2) or the push ring (3) when the rod (1) moves in the pulling-out direction following the rod (1). It consists of a ring-shaped member that contracts and deforms while being twisted while hitting the tapered surfaces (25) (3b) due to the subsequent movement in the drawing direction following the bar (1), and the retaining member (4 ) Indicates edge-shaped biting teeth (4a) (4b) at the smallest diameter portion in the natural state and the portion displaced from the smallest diameter portion to the opposite side of the insertion side end of the bar (1), respectively. In addition, the biting teeth (4a) on the side closer to the insertion side end of the bar (1) are configured to have a smaller diameter than the biting teeth (4b) on the side farther from them, and these biting are performed. A bar material connecting joint, characterized in that the contour line of the outer surface excluding the formation positions of the teeth (4a) (4b) is partially elliptical. 3. A cylindrical joint body (2) formed on a tapered surface (25) whose inner peripheral surface at the end portion gradually decreases in diameter toward the outside, or whose inner peripheral surface gradually extends toward the outside. A tubular joint body (2) into which the push ring (3) formed on the tapered surface (3b) having a small diameter is screwed to the end, and the tapered surface (25) of the joint body (2), or In a rod connecting joint comprising a retaining member (4) arranged in a space surrounded by the tapered surface (3b) of the push ring (3), the retaining member (4) includes the rod (1) and the retaining member (4). Between the tapered surface (25) of the joint body (2) to be inserted or between the rod (1) and the tapered surface (3b) of the push ring (3) screwed to the joint body (2). The tapered surface (25) (3b) formed on the joint body (2) or the push ring (3) when the rod (1) moves in the pulling-out direction following the rod (1). It consists of a ring-shaped member that contracts and deforms while being twisted while hitting the tapered surfaces (25) (3b) due to the subsequent movement in the drawing direction following the bar (1), and the retaining member (4 ) Has a non-circular cross-sectional shape, has a plurality of edge-shaped biting teeth (4a) (4b) on the inner peripheral surface, and bites on the side closer to the insertion side end of the bar (1). The tooth (4a) is configured to have a smaller diameter than the biting tooth (4b) on the side farther from it, and the portion contacting the tapered surface (25) (3b) is formed into a convex curved surface shape. And bar material connection joint.