JPH058185U - Pipe fitting - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pipe joint in which a hose and a collet are integrally prevented from coming off from a joint main body even when an excessive fluid pressure is applied. [Structure] A tubular joint main body 1 having a tapered surface 10 on the inner peripheral surface thereof, the diameter of which is reduced toward the hose insertion port side, and the joint main body 1
A cylindrical collet 2 which is housed movably in the axial direction thereof and which has an outward projecting portion 22 which is engaged with the tapered surface 10 during the movement. When fluid pressure is applied while the hose H is inserted into the collet 2, the outward projection 22 of the collet 2 is pressed against the tapered surface 10 of the joint main body 1 to reduce the diameter of the collet 2. In the pipe joint of the type in which the hose H is connected in a retaining state by the above, the engaging projection 23 is formed on the outer peripheral surface of the collet 2, while the inward protruding piece 11 is projected on the inner peripheral surface of the joint main body 1. When the outer protruding portion 22 is located in the vicinity of the minimum diameter portion of the tapered surface 10, the engaging protrusion 2 is provided.
3 and the inward protruding piece 11 are locked.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  This invention expands and contracts the collet in the joint main body that is in the retaining state to The present invention relates to a pipe joint of a type that locks and releases a hose inserted into a tube.

[0002]

[Prior art]

  An example of this type of pipe joint is shown in FIG. With this thing As shown in the figure, a tapered surface 10 is formed on the inner peripheral surface of the joint main body 1 and A collet 2 having a diameter is provided, and the collet 2 portion is tapered as described above. The hose H inserted in the collet 2 by contacting and separating from the surface 10 To connect and disconnect.

[0003]   As shown in the figure, the collet 2 described above has a cylindrical shape with both ends open, and is expanded. A plurality of slits 20 are provided at the end of the insertion side so that the diameter can be reduced. In order to expand / contract the insertion side end of the portion between the slits 20 in the collet 2. The outer side protruding toward the insertion end and being in the engagement state with the tapered surface 10. Protruding part 22 is provided, and the inside of the hose H is fixed in order to secure it more securely. Engaging claws 21 are formed so as to project to

[0004]   Therefore, in the above-mentioned pipe joint, the fluid is used when the hose H is inserted in the collet 2. When pressure is applied (when a force acts in the direction that the hose H jumps out of the pipe joint) The diameter of the insertion side end of the collet 2 decreases as the collet 2 moves. As it digs into the hose H, the hose H is prevented from coming off.   However, in the above pipe joint, if excessive fluid pressure acts, the hose H There is a problem in that these parts come out together when the hood 2 is bitten.

[0005]   As one means for solving the above problems, for example, Japanese Utility Model Publication No. 61-24787 is disclosed. Those having the disclosed two-step tapered surface, that is, the same tapered surface as the conventional one and Also, a taper surface with a large inclination angle (hereinafter referred to as a large taper surface) is continuously provided There is. In this case, due to the engagement of the large taper surface and the outward protruding portion 22, Compared to the above, it is less likely that the hose H and the collet 2 will integrally come off. Becomes

[0006]   However, even with this pipe joint, if excessive fluid pressure is applied, it will be The problem was not something that could be solved.

[0007]

[Problems to be solved by the device]

  Therefore, in this invention, the hose and the collet are An object of the present invention is to provide a pipe joint in which the joint does not come off from the joint main body.

[0008]

[Means for Solving the Problems]

  In the device according to claim 1 of this application, the inner peripheral surface is reduced in diameter toward the hose insertion port side. And a tubular joint main body 1 having a tapered surface 10 and a shaft center of the joint main body 1. Is accommodated so as to be movable in any direction, and is engaged with the tapered surface 10 during movement. And a cylindrical collet 2 having an outwardly projecting portion 22 in a mating state. When the fluid pressure acts with the hose H inserted in the collet 2, The outward projecting portion 22 of the collet 2 is pressed against the tapered surface 10 of the joint main body 1 so that the collet 2 In the pipe joint of the type in which 2 is reduced in diameter, whereby the hose H is connected in a retaining state. The engaging projection 23 is formed on the outer peripheral surface of the collet 2, while the inner peripheral surface of the joint main body 1 is formed. An inward protruding piece 11 is provided so that the outward protruding portion 22 is located in the vicinity of the minimum diameter portion of the tapered surface 10. When it is positioned, the engaging protrusion 23 and the inward protruding piece 11 are locked. ing.

[0009]

[Action]

  This device has the following effects. When the normal fluid pressure is applied with the hose H inserted in the collet 2, The collet 2 is similar to that described in the section of the prior art, and the collet 2 and the outer protrusion 23 It moves so as to come into contact with the super face 10, and the insertion side end of the collet 2 is contracted along with this movement. As the diameter increases, the hose H is prevented from coming off. If an excessive fluid pressure is applied with the hose H inserted in the collet 2, In the collet 2, the outward protruding portion 22 of the collet 2 is largely moved to the side of the minimum diameter portion of the tapered surface 10. try to.

[0010]   However, in this case, it is connected to the engaging projection 23 formed on the outer peripheral surface of the collet 2. The inner projecting piece 11 projecting from the inner peripheral surface of the hand main body 1 and the outer projecting portion 22 are tapered surfaces 1. When it is positioned near the minimum diameter portion of 0, it is locked so that the collet G2 will not move any further. That is, the collet 2 comes off from the joint main body 1. There will be nothing.

[0011]

【Example】

  The configuration of the present invention will be described below with reference to the drawings shown as examples.   As shown in FIGS. 1 and 2, the pipe joint of this embodiment includes a second tubular member 1a and a second tubular member 1a. The joint main body 1 is configured so as to crimp the tubular member 1b. An accommodating portion 13 accommodating an O-ring 4 and a ring 3 are accommodated on the inner peripheral surface of the tubular member 1a. The accommodating portion 14 that faces the insertion end is provided on the inner peripheral surface of the second tubular member 1b on the insertion end side. A taper surface 10 that expands in diameter is provided on one end of the second tubular member 1b to prevent the collet 2 from coming off. The inward protruding pieces 11 forming the steps are respectively formed. Then, as shown in the figure, In the second cylindrical member 1b, the collet 2 is moved in the axial direction of the joint main body 1. It is stored freely.

[0012]   On the other hand, the hose H used for the pipe joint is made of elastic synthetic resin. At the time of insertion and connection, the tubular shape-retaining metal fitting h is used with its end portion inserted.   As shown in FIG. 1 and FIG. 2, the ring 3 is in a state of being attached to the housing portion 13, It has a tapered surface 30 that reduces in diameter toward the hose insertion port. , The accommodating portion in a stable state by being pushed by the end portion of the second tubular member 1b that has been crimped. It is located at 14.

[0013]   As shown in FIG. 2, the collet 2 has a cylindrical shape, and the collet 2 has an outer peripheral surface on the insertion end side. The protrusion 22 is formed and the engaging claw 21 is formed on the inner peripheral surface. Engaging projections 23 that come into contact with the inward protruding pieces 11 are formed in the order of A plurality of slits 20 that open to the insertion end side are provided. And to insert the hose H Along with the movement of the collet 2 or the collet 2 in the state where the hose H is connected. By pushing operation (operation of the pushing portion 29 attached to the end portion of the collet 2), FIG. As shown in part A of FIG. The insertion end side of No. 2 is in the expanded diameter state (the state where the engaging claw 21 is not engaged with the hose H). Is done. Incidentally, the engaging projection 23 of the collet 2 and the inward protruding piece of the joint main body 1 As shown in the portion C of FIG. The engagement protrusion 23 and the inward protruding piece 11 are in a locked state when positioned in the vicinity of the minimum diameter portion. It is designed to be

[0014]   Since the pipe joint of this embodiment is configured as described above, it has the following effects. To do. When the normal fluid pressure is applied with the hose H inserted in the collet 2, , The collet 2 moves so that the outward protruding portion 22 of the collet 2 and the tapered surface 10 come into contact with each other, and As shown in part B of FIG. 4, the diameter of the insertion side end of the collet 2 decreases with the movement of As a result, the engagement claw 21 is engaged with the hose H. That is, the hose H does not come off It becomes a state. If an excessive fluid pressure is applied with the hose H inserted in the collet 2, In the collet 2, the outward protruding portion 22 of the collet 2 is largely moved to the side of the minimum diameter portion of the tapered surface 10. try to.

[0015]   However, in this case, as shown in the C portion of FIG. 3 and the inner protruding piece 11 of the joint main body 1, and the outer protruding portion 22 is the minimum diameter of the tapered surface 10. Since the collet 2 is locked when the collet 2 is located near the portion, the collet 2 is The collet 2 does not move further toward the smallest diameter side of the bearing surface 10, and the collet 2 is mainly a joint. It will be one that cannot be missed.

[0016]   In addition, instead of the collet 2 of the above embodiment, one of the slits extends from one end to the other edge. A continuous collet, that is, a collet having a circular cross section may be used.

[0017]

[Effect of device]

  Since the present invention has the configuration as described above, it has the following effects.   Since the collet 2 will not come off with respect to the joint main body 1, excessive fluid pressure Even if it acts, the hose H and the collet 2 do not come out from the joint main body integrally. Becomes That is, the hose and collet are integrated even if excessive fluid pressure is applied. It was possible to provide a pipe joint that does not come off from the joint body.

[Brief description of drawings]

FIG. 1 is a half sectional view of a pipe joint of this embodiment and a hose connected to the pipe joint.

FIG. 2 is a half sectional perspective view of the pipe joint.

FIG. 3 is a view showing a state in which a hose is inserted into the pipe joint.

FIG. 4 is a view showing the relationship between the main joint body and the hose collet when a normal fluid pressure is applied in a state where a hose is inserted into the pipe joint.

FIG. 5 is a view showing the relationship between the main joint body and the hose collet when an excessive fluid pressure acts in a state where a hose is inserted in the pipe joint.

FIG. 6 is a half sectional view of a conventional pipe joint.

[Explanation of symbols]

1 Mainly joint 2 collets 10 Tapered surface 20 slits 21 Engaging claw 22 outward protrusion 23 Engagement protrusion

Claims (4)

[Scope of utility model registration request] 1. A tubular joint main body 1 having an inner peripheral surface having a tapered surface 10 whose diameter decreases toward the hose insertion port side, and a joint main body 1 accommodated in the joint main body 1 movably in the axial direction thereof. And a cylindrical collet 2 having an outwardly projecting portion 22 that is in engagement with the tapered surface 10 during the movement, and the hose H is inserted into the collet 2 to form a fluid. When a pressure is applied, the outward projecting portion 22 of the collet 2 is pressed by the tapered surface 10 of the joint main body 1 to reduce the diameter of the collet 2, and thereby the hose H is connected in a retaining state. , The engaging projection 23 is formed on the outer peripheral surface of the collet 2, and the inner projecting piece 11 is projectingly provided on the inner peripheral surface of the joint main body 1. The engaging projection 23 and the inward protruding piece when positioned near the small diameter portion A pipe joint characterized in that 11 and 11 are locked. 2. The collet 2 has a plurality of slits 20 which are open on the insertion end side into the joint main body 1, and an outward protruding portion 22 is provided at a portion between the open portions of the slit 20. The pipe joint according to claim 1, which is characterized in that. 3. The pipe joint according to claim 1, wherein an engaging claw 21 projecting inward is formed at a portion between the opening portions of the slit 20 in the collet 2. 4. The pipe joint according to claim 1, wherein the collet 2 has a circular cross section.