JPH0731031Y2 - Member for preventing sticking out of joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a retaining member for retaining a rod material such as a pipe or a rod inserted into a joint.

[Conventional technology]

A joint using this kind of retaining member is shown in FIG. In this joint, a recess 101 is formed on the resin-coated inner surface side of the joint body 100, and a collar 110 made of synthetic resin is fitted into the recess 101. The collar 110 is provided with a tubular portion 111 and a tapered taper surface 112 formed on a portion outside the tubular portion, and the like, and the ring body 11 is provided in a space surrounded by the tapered surface 112 and the tubular portion 111. Is housed. As shown in FIG. 5, the ring body 11 has a circular cutout portion 12 at one position in the circumferential direction, and is itself elastic, and the inner diameter D in the natural state is the bar material shown in FIG. It is set slightly smaller than the outer diameter D _{1 of} 200.

In such a joint, when the rod member 200 is inserted into the joint body 100, the ring body 11 contacts the tip of the rod member 200, and the ring body 11 is pressed against the projection 102 on the inner side of the recess 101. When the rod 200 is further inserted, the ring body 11 backed up by the protrusions 102 is forcibly expanded by the rod 200 against the elasticity, and the bar 200 is pushed on the ring body 11 thus expanded. Is inserted. Therefore, due to the elastic restoring force of the ring body 11, as shown in FIG.
It is held at 0 on the outside.

After that, when the rod 200 holding the ring body 11 is pulled out in the arrow X direction, the ring body 11 moves in the same direction together with the rod 200, and the ring body 11 moves along with the taper surface 11 along with the movement.
After coming into contact with the rod 2, the taper surface 112 presses it to reduce its diameter and press-contacts the rod 200. The pressure contact force of the ring body 11 with respect to the bar member 200 at this time becomes larger as the bar member 200 is pulled out in the arrow X direction when there is no slippage therebetween. Therefore, under the condition that there is no slippage between the two, the larger the force (pulling load) for pulling the bar member 200 in the arrow X direction, the greater the pressure contact force of the ring body 11 with respect to the bar member 200 (in other words, the bar member). The biting amount of the ring body 11 with respect to 200 is increased, and the ring body 11 exhibits a good retaining action.

Therefore, the inventor of the present application conducted various investigations on conditions under which the rod 200 and the ring body 11 do not slip when a pulling load is applied to the rod 200. As a result, the fitting body 100
The larger the elastic restoring force of the ring body 11 when the rod body 200 is inserted into the rod body 200 and the ring body 11 is held by the rod body 200 in an externally fitted state, that is, the initial engaging force of the ring body 11 with respect to the rod body 200 is larger. As long as the two members are less slippery and the initial catching force is small, even if the ring body 11 is pressed by the taper surface 102 to reduce the diameter when the bar member 200 is pulled out, slippage occurs between the two members and It was found that the pressure contact force or the biting margin of the ring body 11 with respect to 200 was not so large and the reliability of the retaining action was impaired.

The initial catching force of the ring body 11 on the bar 200 is related to the strength of elasticity of the ring body 11. Specifically, regarding the initial catching force of a plurality of ring bodies 11 having the same material and the same ring inner diameter, the thicker the material forming the ring body 11, the larger the initial catching force. Further, the larger the outer diameter of the bar member 200, the larger the initial catching force is required in order to exert the reliable retaining action.

Therefore, in order to exert a highly reliable retaining action, the minimum thickness of the material forming the ring body 11 is inevitably determined according to the outer diameter of the rod 200, and the outer diameter is large. For bar 200, a ring body that is necessarily thick material 1
1 is required.

[Problems to be solved by the device]

However, the thinner the material forming the ring body 11, the easier it is to insert the rod member 200 into the ring member 11, and the higher the roundness when the ring member 11 is held by the rod member 200. On the other hand, it has been found that the thicker the material, the more difficult it is to insert the rod 200 into the ring body 11, and that the circularity decreases and the ring body 11 only comes into pressure contact with the number of points on the outer periphery of the rod 200. .

Therefore, conventionally, the thickness of the material forming the ring body 11 is determined in consideration of both the ease of inserting the rod 200 into the ring body 11 and the retaining action of the ring body 11. Therefore, there is a problem in that only one of the ease of inserting the rod and the retaining action of the ring body 11 is emphasized, and the other must be sacrificed.

Further, if the material of the ring body 11 is made too thick with emphasis on the retaining action, not only the material cost and the processing cost increase, but also the workability when the ring body 11 is attached to the joint body 100 decreases. There is also a problem that the assembly cost rises and causes a great economic disadvantage.

The present invention has been made in view of the above problems, and should be devised so that a sufficiently large initial catching force can be secured without making the thickness of the material forming the ring body so large. Thus, it is an object of the present invention to provide a bar member retaining member for a joint, which can satisfy both the ease of inserting the bar member and the retaining function.

[Means for Solving the Problems]

The joint slip-out preventing member according to the present invention holds the ring body externally fitted on the bar member between the both ends of the ring body similar to those described with reference to FIGS. A tension coil spring that pulls and urges the ring body in the radial direction when engaged is engaged and connected, and a biting edge for the bar is formed on the inner circumference of the ring body. .

[Action]

According to this structure, the elastic restoring force exerted by the ring body itself is assisted by the biasing force exerted by the tension coil spring interposed between the both end portions of the ring body sandwiching the truncated circle portion. Therefore, the initial catching force of the ring body with respect to the rod member is larger than the force exerted by the elastic restoring force of the ring body itself, and the same action as when the material of the ring body is thickened is exhibited.

〔Example〕

FIG. 1A is a front view of a retaining member 1 according to an embodiment of the present invention, and FIG. 1B is a side view of the same. This retaining member 1 is
A tension coil spring (13) is interposed between both end portions of a ring-shaped ring body (11) having an open-circle shape sandwiching the open-circle portion (12). The ring body 11 is made of a metal material having elasticity, and the tension coil springs 13 engage and connect both ends of the tension coil spring 13 to the corresponding ends of the ring body 11, respectively. Is intervened in.

Such a retaining member 1 is the ring body described in the conventional example.
In a manner similar to 11, the housing is housed in the space surrounded by the tapered surface 112 of the joint body 100 as shown in FIG. Then, when the rod 200 is inserted into the joint body 100, the ring body 11 contacts the tip of the rod 200, and the ring body 11 is pressed against the protrusion 102. When the rod 200 is further inserted, the ring body 11 backed up by the protrusions 102 is forcibly expanded by the rod 200 against the elasticity, and the bar 200 is pushed on the ring body 11 thus expanded. It is inserted as shown in FIG.
In this case, since it is not necessary to make the material of the ring body 11 so thick, the rod member 200 can be easily inserted into the retaining member 1, and the ring member 11 is held by the rod member 200. Then, the ring body 11 maintains a high roundness and contacts the entire circumference of the bar material 200. Further, as the ring body 11 is expanded, the tension coil spring 13 is also stretched against its elasticity. Therefore, the magnitude of the initial catching force of the retaining member 1 with respect to the bar member 200 depends on the direction in which the ring body 11 is reduced in diameter by the force due to the elastic restoring force of the ring body 11 and the elastic restoring force of the tension coil spring 13. This is the sum of the urging force, which is larger than the case where only the force due to the elastic restoring force of the ring body 11 is used.

As described in the conventional example, when the bar body 200 holding the ring body 11 is pulled out in the arrow X direction after the ring body 11 is externally fitted and held by the bar body 200 as shown in FIG. Similarly, after the ring body 11 contacts the taper surface 112, the ring body 11 is pressed by the taper surface 102 to reduce the diameter, and is pressed against the bar material 200. In this case, since the initial catching force of the retaining member 1 with respect to the rod 200 is large as described above, both of them are less likely to slip. Therefore, the larger the pulling load applied to the rod 200, the larger the ring body with respect to the rod 200. The biting margin of 11 is increased, and the ring body 11 exhibits a good retaining function.

Although the straight tension coil spring 13 is used in FIG. 1A, it is preferable to use the tension coil spring 13 formed in an arc shape having the same radius of curvature as the ring body 11 as shown in FIG. By doing so, the ease with which the rod 200 is inserted is further improved. In FIG. 2, C indicates the axis of the tension coil spring.

The material of the ring body 11 may have a perfect circular or oval cross-sectional shape. As shown in FIG. 3A, a part of the inner circumference of the ring body 11 is cut out to form biting edges 15 and 16 on both sides of the cutout portion 14, and the bar material 20 is formed by the biting edges 15 and 16.
The biting action against 0 is exhibited more reliably. Even if it has a trapezoidal cross-sectional shape as shown in FIG. 3B instead of the cross-sectional shape as shown in FIG. 3A, it has a serrated edge 17 formed on the inner peripheral surface as shown in FIG. 3C. However, as shown in FIG. 3D, the edges 18 and 19 may be formed on both sides of the inner peripheral surface.

[Effect of device]

As described above, according to the present invention, the initial catching force of the ring body with respect to the rod member is increased more than the force exerted by the elastic restoring force of the ring body without thickening the material of the ring body. Therefore, even if the ring body is made thin to facilitate insertion of the bar, a sufficiently large initial catching force is secured and a reliable retaining action is exhibited. Further, it becomes possible to reduce the material cost, the processing cost, and the assembly cost of the ring body by making the ring body thin.

In particular, since a tension coil spring is adopted as a member for urging the ring body in the diameter reducing direction, when the rod is inserted into the ring body, the coil portion of the tension coil spring only comes into linear contact with the outer circumference of the rod. Since there is little frictional resistance between them, the rod can be easily inserted into the ring body, and the tension coil spring can also be easily compressed, so it is easy to reduce the diameter of the ring body and install it in the joint body. The effect is that it can be done. Moreover, in addition to the tension coil spring, a biting edge is provided on the inner circumference of the ring body, and the biting edge and the diameter reducing action of the tension coil spring are combined to more reliably exert the biting action of the ring body on the bar. It is excellent in that

The retaining member of the present invention can be suitably used as a retaining component for various joints such as a mechanical joint as well as a plug-in joint.

[Brief description of drawings]

FIG. 1A is a front view of a retaining member according to an embodiment of the present invention,
FIG. 1B is a side view of the same, FIG. 2 is a front view of a modified example, and FIG.
FIG. 3D is a partial cross-sectional view illustrating the cross-sectional shape of the material forming the ring body, FIG. 4 is a partial cross-sectional view of a state in which a bar is inserted in the joint, and FIG. 5 is a front view of a conventional example. is there. DESCRIPTION OF SYMBOLS 1 ... Detachment prevention member, 11 ... Ring body, 12 ... Ring body lacking part, 13 ... Elastic member, 100 ... Joint body, 112 ... Tapered surface, 20
0 ... bar material.

Claims (1)

[Scope of utility model registration request] Claims: 1. A ring body having elasticity, which is accommodated in a space surrounded by a tapered surface of a joint body and has elasticity, is expanded by a rod member inserted into the joint body and is externally attached to the rod member. In such a configuration that the ring body is held in a fitted shape and then the ring body holding the ring body is pulled out so that the ring body is pressed by the taper surface to reduce the diameter, and is pressed against the bar material. A tension coil spring that pulls and urges the ring body in a radially contracting direction when the ring body is externally fitted to the rod is engaged between both ends of the ring body that sandwich the truncated circle. A member for preventing sticking out of a bar member of a joint, which is connected and has a biting edge formed on the inner circumference of the ring member for the bar member.