JP2005256988A - Tube insert joint and lock claw press-in tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock claw press-in tool not requiring high accuracy and capable of reducing manufacturing cost in comparison with a current one, and to provide a tube insert joint capable of easily and surely fitting/removing a tube in comparison with the current one. <P>SOLUTION: The lock claw press-in tool is formed into a cylindrical shape notched in a part thereof to have a slit 28 (28') on one side of a barrel wall 27 (27'), and has a required elasticity in the condition wherein it is deformed by narrowing diameter, and to be assembled in a tube connecting access 16 (16') of a joint main body a (a') in the narrowed and deformed condition. The tube insert joint is formed by assembling this lock claw press-in tool in the tube connecting access 16 (16') of the joint main body a (a'). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pipe insertion joint used for connecting pipes such as pipes, hoses, and tubes, and a locking claw pusher for removing a pipe inserted into the pipe insertion joint.

Conventionally, there has been known a pipe insertion joint 4 as shown in FIG. 11 in which a cylindrical locking claw pusher 3 is slidably incorporated in a pipe connection port 2 formed at an end of a joint main body 1. (See Patent Document 1).
The pipe connection port 2 of the joint main body 1 has a protruding edge 5 on the inner surface of the outer end portion, a locking claw pusher fitting chamber 6 on the inner back side, and a claw ring insertion annular groove on the inner back side. 7 is formed, and the claw ring sandwiching annular groove 7 is a circle in which a plurality of locking claws 8 with their distal ends 8 'oriented in the central direction are arranged in a row with their base ends continuous. An annular claw ring 9 is incorporated.

In addition, the locking claw pusher 3 has a flange 12 projecting from the outer end of a cylindrical peripheral wall 11 having a required wall thickness whose inner diameter is slightly larger than the outer diameter of the tube 10, and inwardly. An annular recess 13 is formed by digging, and an inner end portion 14 ′ of the inner fitting projection 14 is tapered (FIGS. 11 and 12).
And the said latching claw pushing tool 3 fits the said annular recess 13 to the said protrusion 5 in the pipe connection port 2 of the said joint main body 1, and it is inside and outside within the range of the width | variety of the said annular recess 13. It is assembled so as to be slidable, and when it is pushed inward, the inner end portion 14 ′ of the fitting convex portion 14 comes into contact with the respective locking claws 8 of the claw ring 9.

In the pipe insertion joint 4 having such a structure, the distal end 8 ′ of each locking claw 8 of the claw ring 9 is attached to the outer peripheral surface of the pipe 10 inserted into the pipe connection port 2 through the locking claw pusher 3. The tube 10 is kept in a state of being bitten so that the tube 10 cannot be removed carelessly.
Further, when the latching claw pusher 3 is pushed inward, the inner end portion 14 'of the fitting convex portion 14 pushes the respective latching claws 8 ... of the claw ring 9 into the inner back side, and the latching thereof. The nail | claw 8 ... bites with respect to the outer peripheral surface of the pipe | tube 10 is removed, and the said pipe | tube 10 can be removed now.
Japanese Patent Laid-Open No. 2003-56778

  However, the locking claw pusher 3 can be slidably incorporated into the pipe connection port 2 of the joint main body 1, and the inner end portion 14 ′ of the fitting convex portion 14 can be accurately connected to each of the claw rings 9. Since it should be able to be brought into contact with the locking claws 8 and the tube 10 can be inserted, high precision is required for the manufacturing process, and the manufacturing cost is high. There was a problem of becoming bulky.

  Further, in order to securely bite the locking claws 8 to the outer peripheral surface of the tube 10 with a light force, the tips of the respective locking claws 8 biting into the outer peripheral surface of the tube 10 as much as possible. It is clear that the inner end portion 14 'of the fitting convex portion 14 of the latching claw pusher 3 may be brought into contact with the position close to 8'. Since the inner diameter is slightly larger than the outer diameter of the tube 10, the inner end portion 14 ′ is a portion 8 ″ that is close to the base end side by a required distance from the distal end 8 ′ of each locking claw 8. Had come to abut.

  Therefore, in order to remove the engagement of the latching claws 8 from the outer peripheral surface of the pipe 10, the latching claw pushing tool 3 must be pushed with a considerable force. When a force in the pulling-out direction is applied, there is a problem in that the tips 8 'of the locking claws 8 ... firmly bite into the outer peripheral surface, making it difficult to remove the tube 10.

  Therefore, the present invention is not required to be as precise as the conventional one, and the latching claw pusher capable of reducing the production cost than the conventional one, and by incorporating this, it is easier and more reliable than the conventional one. An object of the present invention is to provide a pipe insertion joint that can be removed.

  The locking claw pusher of the present invention according to claim 1 is incorporated into the pipe connection port at the end of the joint main body so as to be slidable inward and outward, and is incorporated into the pipe connection port by being pushed inward. In a locking claw pusher capable of bending and retracting the locking claw of the ring inward and rearward, a circular cylindrical shape having a slit 28 (28 ') on one side of the trunk wall 27 (27') And having the required elasticity in a deformed state with a reduced diameter, and incorporated in the pipe connection port 16 (16 ') of the joint main body a (a') in the deformed state. It is made to become.

  According to a second aspect of the present invention, there is provided a pipe insertion joint in which the locking claw pusher according to the first aspect is incorporated in the pipe connection port 16 (16 ') of the joint main body a (a').

The latching claw pusher according to claim 1 is incorporated into the pipe connection port at the end of the joint main body so as to be slidable inward and outward, and the claw ring incorporated into the pipe connection port by being pushed inward. The locking claw pusher that allows the locking claw to be bent and retracted inwardly has a round cylindrical shape with a slit on one side of the trunk wall, and is deformed with a narrowed diameter. In this state, it has the required elasticity and is incorporated into the pipe connection port of the joint main body in its squeezed and deformed state, so that the pipe can be recovered with an appropriate restoring force to expand to the original diameter. It fits in the connection port 16 in a stable state. Further, the manufacturing cost can be reduced because it is not necessary to manufacture with higher accuracy than the conventional one.
Moreover, by incorporating this into the pipe insertion joint, the pipe can be removed with a light force more easily and reliably than the conventional one.

  In the pipe insertion joint according to claim 2, since the locking claw pusher is incorporated in the pipe connection port of the joint main body, the locking claw pusher is held in a stable state and is a conventional one. It is easier and more reliable to remove the tube with light force.

  The cylindrical wall 27 (27 ') has a slit-shaped cylindrical shape having a slit 28 (28') on one side, and has a required elasticity in a deformed state with a reduced diameter. A locking claw pusher e which is incorporated into the pipe connection port 16 (16 ') of the joint main body a (a') in a deformed state.

“a” is an inner hollow cylindrical shape having a required thickness, and is a joint main body made of metal such as brass (brass) or resin, and pipe connection ports 16 and 16 are formed at both ends thereof. .
Since the pipe connection ports 16 and 16 are only symmetrically located and have the same structure, the same portions are denoted by the same reference numerals and only the structure of one of the pipe connection ports 16 will be described.
Reference numeral 17 denotes a projecting edge having a required width w1 formed on the inner surface side of the outer end of the pipe connection port 16, and thus also the outer end of the joint main body a, and the inner diameter k1 is the outer edge of the pipe b to be connected. It is larger than the diameter k2.
Reference numeral 18 denotes a locking claw pusher fitting chamber having a required inner diameter k3, which is excavated and formed on the inner inner surface of the protruding edge 17. Reference numeral 19 denotes an inclined surface formed on the inner back side of the engaging claw pusher fitting fitting chamber 18 so as to be continuous with the inner surface.
Reference numeral 20 denotes a claw ring sandwiching annular groove formed in the middle of the inclined surface 19, and 21 is a land portion having an arcuate cross section formed on the inner back side of the claw ring sandwiching annular groove 20.
Reference numeral 22 denotes a seal ring receiving annular groove formed by excavation at a position on the inner back side with respect to the land portion 21.
Reference numeral 23 denotes an annular jetty formed on the inner back side of the seal ring receiving annular groove 22.

c is a claw ring formed of a metal spring material such as phosphor bronze. The claw ring c has a large number of inner cuts 24 and outer cuts 25 arranged alternately and radially on the inner periphery and outer periphery of an annular plate having a required width. A number of locking claws 26... Facing are formed in a line (FIG. 8).
The front end 26 'side of each of the locking claws 26 is bent by a required angle in one direction with respect to the base end 26 "side, and the inner diameter k4 of the claw ring c, that is, the front end 26 of the opposing locking claw. The distance between 'and 26' is smaller than the outer diameter k2 of the pipe b.
However, it is also possible to use a claw ring that extends straight in the center direction without bending the distal end 26 'side with respect to the proximal end 26 "side.

  d is an annular seal ring made of a required elastic material such as rubber.

e is a non-circular and cylindrical locking claw pusher having a slit 28 having a required width on one side of the body wall 27. This engaging claw pushing tool e has a required elasticity in a deformed state by narrowing the diameter while narrowing the width of the slit 28 when an external force is applied from the outer peripheral direction of the body wall 27. When removed, it expands to its original diameter.
The inner diameter k5 of the body wall 27 is slightly larger than the outer diameter k2 of the tube b. However, when a required external force is applied and the tube wall 27 is narrowed, the inner diameter is smaller than the outer diameter k2 of the tube b.

  Reference numeral 29 denotes a flange that protrudes from the outer end of the outer periphery of the body wall 27. The outer diameter is sufficiently larger than the inner diameter k1 of the protruding edge 17 of the joint main body a, and is larger than the inner diameter k1 of the protruding edge 17 even when it is most constricted.

  Reference numeral 30 denotes an annular recess formed in an outer periphery of the trunk wall 27 at an inner position of the flange portion 29. The outer diameter k6 is slightly larger than the inner diameter k1 of the protruding edge 17 of the pipe connection port 16, but the outer diameter when constricted is smaller than the inner diameter k1 of the protruding edge 17. Further, the width w2 of the annular recess is wider than the width w1 of the protruding edge 17.

Reference numeral 31 denotes a fitting convex portion formed on the outer periphery of the body wall 27 at an inner position of the annular recess 30. The outer diameter k7 is slightly larger than the inner diameter k3 of the engaging claw pusher fitting fitting chamber 18 of the pipe connection port 16, but when it is squeezed, the outer diameter is the inner diameter k1 of the protruding edge 17. Smaller than.
Therefore, the locking claw pusher e receives the portion of the fitting protrusion 31 into the locking claw pusher fitting chamber 18 of the joint main body a through the protruding edge 17 by narrowing the diameter. It can be made to.

Reference numeral 32 denotes a taper formed continuously inside the fitting convex portion 31.
The inner end 33 of the tapered portion 32 of the illustrated locking claw pusher e has a required thickness f, but the inner end 33 is preferably as thin as possible. That is, the taper 32 is better as it is sharper.

  The locking claw pusher e is formed of a required material such as a hard plastic or a metal such as brass.

  The seal ring d, the claw ring c, and the locking claw pusher e are incorporated in the pipe connection ports 16 of the joint main body a, thereby constituting the pipe insertion joint of this embodiment.

  At the time of incorporation, the seal ring d is first received in the seal ring receiving annular groove 22 of the pipe connection port 16, and then the tips 26 ′ of the respective locking claws 26. The claw ring c is fitted with the side facing inward. However, of course, when using a claw ring in which the tip 26 'side is not bent, the direction is not limited.

Then, the locking claw pusher e is assembled into the pipe connection port 16 while pressing the tip 32 against the protruding edge 17 of the pipe connection port 16 to forcibly reduce the diameter and deform it.
As a result, the latching claw pusher e fits the fitting projection 31 into the latching claw pusher fitting chamber 18 in the pipe connection port 16 of the joint main body a, and the annular recess 30 is formed in the protruding edge. 17 is fitted.

  The locking claw pusher e makes the outer diameter k7 of the fitting projection 31 slightly larger than the inner diameter k3 of the locking claw pusher fitting chamber 18 as described above, and projects the outer diameter k6 of the annular recess 30. Since it is slightly larger than the inner diameter k1 of the edge 17, the pipe connection port 16 has a desired elasticity in a deformed state with a reduced diameter, and has a suitable restoring force to expand to the original diameter. Therefore, unlike the conventional locking claw push-in tool, it does not move or idle.

Note that, as described above, the locking claw pusher e is incorporated into the joint main body a in a state of being deformed and narrowed to a predetermined diameter, so even if there are some errors in the dimensions of each part, It is stably accommodated in the pipe connection port 16 by the restoring force.
Therefore, the tolerance is larger than that of the conventional one, and it is not necessary to manufacture with high accuracy as required in the past, so that the manufacturing cost can be reduced.

  Further, since the built-in locking claw pusher e makes the width w2 of the annular recess 30 wider than the width w1 of the projecting edge 17, it slides in and out within the range of the width w2 of the annular recess 30. Each of the locking claws 26 of the claw ring c is pressed by the inner end 33 of the tapered portion 32 by pushing it inward, so that the locking claw 26. 16 can be bent and retracted to the inner back side.

When the pipe b is inserted into the pipe connection port 16 of the pipe insertion joint through the locking claw pusher e, each locking claw 26 of the claw ring c is bent and retracted in the insertion direction, and the pipe b Allow insertion.
In a state in which the pipe b is inserted until the tip comes into contact with the annular jetty 23, the seal ring d presses against the outer peripheral surface of the pipe b, and seals between the outer peripheral surface and the inner surface of the joint main body a to leak fluid. In addition, the tips 26 'of the locking claws 26 of the claw ring c bite into the outer peripheral surface and prevent the tube b from being pulled out carelessly.
At this time, a fine gap 34 is formed between the outer peripheral surface of the tube b and the inner surface of the locking claw pusher e (FIGS. 2 and 3).

  In order to remove the inserted pipe b from the pipe insertion joint b, the locking claw pusher e is pushed inward of the joint main body a, and each locking claw 26 of the claw ring c is bent and retracted inward. Then, it is possible to remove the biting of the distal end 26 ′ from the outer peripheral surface of the tube b and pull out the tube b while the locking claw pusher e is pushed in.

At that time, the locking claw pusher e pushed inward shows the following behavior in more detail.
That is, when the latching claw pusher e is pushed inward of the joint main body a, the inner end 33 of the tapered portion 32 is initially set at a position A opposite to the latching claw 26 ... biting into the outer peripheral surface of the tube b. They are brought into contact with each other (state (A) in FIGS. 3 and 4).
When the inner end 33 is further pushed in from this state, the inner end 33 receives a force in the direction of reducing the diameter from the latching claws 26 biting into the tube b, whereby the latching claw pusher e is It is pushed inward while forcibly reducing its diameter, the gap 34 is reduced, and finally the inner peripheral surface is made to coincide with the outer peripheral surface of the tube b (the state (b) in FIG. 4). ).

When the diameter is forcibly reduced, the position where the inner end 33 abuts against the locking claws 26 is shifted from the initial position A to the portion B on the tip 26 'side.
Therefore, by further pushing the latching claw pusher e from this state, the portion B near the tip 26 'of the latching claw 26 can be pressed, and the bite into the outer peripheral surface of the tube b has been conventionally achieved. It can be easily removed with a smaller force (FIG. 5).

  Although it has already been described that the tip 32 of the locking claw pusher e is sharper, the more sharp the tip 32 is, the more the tip 26 'of the locking claw 26 becomes. This is because the position on the side can be pressed, and the biting into the outer peripheral surface of the tube b of the locking claw 26 can be removed with a smaller force.

In the above, (i) the outer diameter k6 of the annular recess 30 of the locking claw pusher e is set slightly larger than the inner diameter k1 of the projecting edge 17 of the pipe connection port 16 of the joint main body a, and (ii ) By making the outer diameter k7 of the former fitting projection 31 slightly larger than the inner diameter k3 of the latter locking claw pusher fitting chamber 18, the locking claw pusher e is deformed with a reduced diameter. The example which was made to integrate stably in the pipe connection port 16 in the state was shown.
However, the locking claw pusher does not satisfy both of the above conditions (i) and (ii), that is, satisfies the one of the conditions, that is, the outer diameter k6 of the annular recess 30 is larger than the inner diameter k1 of the protrusion 17. It may be just a little larger, or it may be just a larger outside diameter k7 of the fitting projection 31 than the inside diameter k3 of the locking claw pusher fitting chamber 18, such as In addition, since the diameter of the fitting recess 30 or the fitting convex portion 31 is narrowed and the fitting can be stably fitted into the pipe connection port 16 in the deformed state, the same effect can be obtained.

a ′ is a joint main body made of metal such as brass (brass), resin, or the like, which is a hollow cylindrical shape having a required thickness and is straight (FIG. 9).
This joint main body a ′ is such that the engaging claw pusher fitting chamber 18 ′ is opened without providing a protruding edge at the outer end of the pipe connection port 16 ′ at the end. Since the other points are the same as the joint main body a of Example 1, the same reference numerals are given to the same portions, and the detailed description is omitted.

“e ′” is a non-circular and cylindrical locking claw pusher having a slit 28 ′ having a required width on one side of the body wall 27 ′ (FIGS. 9 and 10).
Unlike the locking claw pushing tool e of the first embodiment, the locking claw pushing tool e ′ has a flat outer peripheral surface 27 ″ on the outer end side of the body wall 27 ′, and has a fitting convex portion, a fitting concave portion, And does not have a buttock.
The outer diameter of the outer peripheral surface 27 ″ on the outer end side of the body wall 27 ′ is slightly larger than the inner diameter of the engaging claw pusher fitting fitting chamber 18 ′ of the joint main body a ′.
Since other points such as the formation of the tapered portion 32 on the inner end side are the same as those of the locking claw pusher e of the first embodiment, the same portions are denoted by the same reference numerals and detailed description will be given. Omitted.

  The pipe insertion joint of the present embodiment is constructed by incorporating a locking claw pusher e ', a claw ring c, and a seal ring d into the pipe connection port 16' of the joint main body a '(FIG. 9).

  The locking claw pusher e ′ is kept in a stable state in the pipe connection port 16 ′ by an appropriate restoring force that tends to expand to the original diameter while the diameter is narrowed and deformed. Unlike the locking claw pusher, it does not move freely or idle.

  The built-in latching claw pusher e ′ is slidable inward and outward, and by pushing inwardly, the latching claws 26 of the claw ring c can be bent and retracted inward and rearward. Further, when the inner end 33 is further pushed inward in a state where the inner end 33 is in contact with the locking claws 26 of the claw ring c, the inner end 33 receives a force in the direction of reducing the diameter from the locking claws 26. Therefore, this narrows the diameter while narrowing the width of the slit 28 '.

  Therefore, as in the first embodiment, the inner end 33 of the tapered portion 32 of the locking claw pusher e ′ can press the portion of the claw ring c near the tip of each locking claw 26. The connected pipe can be easily removed with a smaller force than in the past.

  In the embodiment, the pipe insertion joint using the straight joint main bodies a and a ′ has been described as an example, but the joint main body has various shapes such as an L shape, a U shape, a T shape, and a cross shape. In addition, it is also possible to use a pipe that can connect pipes having different diameters by changing the opening diameters of the pipe connection ports at both ends.

It is a perspective view of the pipe insertion joint which concerns on Example 1 of this invention. It is a longitudinal cross-sectional view same as the above. It is the longitudinal cross-sectional view which expanded and showed the principal part of FIG. The main part enlarged vertical sectional view showing a state in which the diameter of the locking claw pusher whose inner end is brought into contact with the locking claw of the claw ring is further pressed from the position and the diameter thereof is forcibly reduced. is there. It is the principal part expanded longitudinal cross-sectional view which showed the state which the latching claw pushing tool was further pushed in and the biting into the pipe | tube of the said latching claw was removed. It is a front view of the said latching claw pushing tool. It is the side view which fractured and showed a part same as the above. It is a front view of the said nail | claw ring. It is a principal part expanded longitudinal cross-sectional view of the pipe insertion joint which concerns on Example 2. FIG. It is a perspective view of the latching claw pushing tool incorporated in the pipe insertion joint. It is a principal part expanded longitudinal sectional view of the conventional pipe insertion joint. It is a perspective view of the conventional latching claw pushing tool incorporated in the pipe insertion joint.

Explanation of symbols

a, a ′ Fitting main body b Tube c Claw ring d Seal ring e, e ′ Locking claw pusher f Tapered thickness k1 Inner diameter k2 Pipe outer diameter k3 Locking claw pusher fitting chamber inner diameter k4 Inner diameter k5 of the claw ring Inner diameter k6 of the engaging claw pusher Outer diameter k7 of the annular recess Outer diameter w1 of the fitting convex portion Width of the projecting edge w2 Width of the annular recess 16, 16 'Pipe connection port 17 Protruding edge 18, 18 'locking claw push-in tool fitting chamber 27, 27' trunk wall 28, 28 'slit 29 collar 30 annular recess 31 fitting convex 32

Claims (2)

It is incorporated into the pipe connection port at the end of the joint slidably inward and outward, and when it is pushed inward, the hooking claw of the claw ring built into the pipe connection port is bent and retracted to the inner back side. In the locking claw pusher that can be
A cylindrical shape having a slit (28, 28 ') on one side of the trunk wall (27, 27'), and a desired elasticity in a deformed state with a narrowed diameter; A locking claw pusher characterized by being incorporated into the pipe connection port (16, 16 ') of the joint main body (a, a') in a state of being narrowed and deformed.   A pipe insertion joint comprising the locking claw pusher according to claim 1 incorporated in a pipe connection port (16, 16 ') of a joint main body (a, a').

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