JP2008240881A - Hose joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow visual confirmation that the connecting of a hose is completed, completely prevent coming out of the hose accompanying loosening of a holding ring, and positively seal the hose and a nipple by appropriate pressing of the holding ring. <P>SOLUTION: The holding ring 2 is reversely moved by pulling out of the hose H. Thereby, an inner peripheral face 2a of the holding ring 2 is made to continuously press on an outer peripheral face H1 of the hose H, and is connected to the hose H unable to be pulled out, and at the same time, a mark part 2e of the holding ring 2 protrudes to the outside to be visual from an opening 3c of a cap 3. A locking means 2f is formed on the mark part 2e for locking to an opening edge 3b of the cap 3, and the locking means 2f that has reversely moved by pulling out of the hose H is locked with the opening edge 3b of the cap 3 to be immovable in the hose inserting direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a hose joint that can be connected without using a tool by inserting a hose and pulling it back slightly.
Specifically, a holding ring facing the nipple is provided so as to be reciprocable in the hose insertion direction along the inner peripheral surface of the cap, and the holding ring is pulled out by pulling out the hose inserted between the nipple and the holding ring. It is related with the hose coupling which the inner peripheral surface presses on the outer peripheral surface of a hose and connects so that extraction is impossible.

  Conventionally, as a hose joint of this type, a tightening ring that has spring elasticity and is integrally formed with a latching portion on its inner peripheral surface is built in the tapered surface, and the tightening ring is tapered by its restoring elastic force. There is one that is pushed back along the surface and presses the latching portion on the inner periphery to the nipple side, thereby crimping the hose and fixing it tightly (for example, see Patent Document 1).

Japanese Utility Model Publication No. 58-2489 (first page, FIGS. 1 to 3)

However, in such a conventional hose joint, as long as the restoring resilience remains, the ring inner peripheral surface continues to be pressed toward the hose. However, if an impact such as vibration acts on the ring or hose, the spring elasticity Since the portion may be elastically deformed to move the ring in the hose insertion direction, there is a problem that the holding force of the hose may be loosened and the hose may be easily pulled out.
In addition, the ring is built to reciprocate inside the taper surface, and the pressing condition of the ring against the hose could not be seen from the outside, so the operator can visually confirm that the hose connection work has been completed. There was also a problem of anxiety.

The first invention of the present invention aims to visually confirm the completion of hose connection.
In addition to the object of the first invention, the second invention aims to completely prevent the hose from coming off due to the slack of the retaining ring.
In addition to the object of the first invention or the second invention, the third invention is intended to reliably seal the hose and the nipple with an appropriate pressing of the retaining ring.

In order to achieve the above-mentioned object, the first invention of the present invention is characterized in that the retaining ring is provided with a mark portion protruding outward from the opening of the cap by reverse movement accompanying pulling out of the hose. It is.
According to a second aspect of the present invention, in the configuration of the first aspect of the present invention, a locking means that engages with the opening edge of the cap is formed in the mark portion, and the locking means that has been moved backward by pulling out the hose is connected to the opening edge of the cap. And a configuration in which the hose is inserted so as not to move in the hose insertion direction.
According to a third invention, in the configuration of the first invention or the second invention, an annular recess extending in the circumferential direction is formed on the outer peripheral surface of the nipple so as to face the inner peripheral surface of the holding ring. An annular seal material that can be elastically deformed is fitted inside and held so as to be immovable in the axial direction, and the outer peripheral end of the annular seal material is protruded from the outer peripheral surface of the nipple and is brought into pressure contact with the inner peripheral surface of the hose. It is characterized by adding a configuration.

According to the first aspect of the present invention, the holding ring is reversely moved by pulling out the hose so that the inner peripheral surface thereof continues to be pressed against the outer peripheral surface of the hose so that it cannot be pulled out. The mark part protrudes outward from the opening of the cap and becomes visible.
Therefore, the completion of the hose connection can be visually confirmed.
As a result, the operator can visually confirm that the hose connection work has been completed compared to the conventional one where the pressing state of the ring against the hose cannot be seen from the outside. The occurrence of accidents such as defects can be prevented.

In the second invention, in addition to the effect of the first invention, the retaining means is locked against the opening edge of the cap so as not to move in the hose insertion direction by the reverse movement of the holding ring when the hose is pulled out. Thus, even if the hose is subsequently inserted, the holding ring does not enter the cap, and the inner peripheral surface of the holding ring continues to press against the outer peripheral surface of the hose.
Accordingly, it is possible to completely prevent the hose from coming off due to the slack of the retaining ring.
As a result, when an impact such as vibration acts on the ring or hose, compared to the conventional one in which the spring elastic part may elastically deform and move the ring in the hose insertion direction, an impact such as vibration occurs, The hose is made of, for example, resin, and even if permanent deformation (creep) occurs in the pressed portion of the hose due to changes over time, the hose can be disconnected and can be kept connected for a long time.

In the third invention, in addition to the effects of the first invention or the second invention, an annular recess extending in the circumferential direction is formed on the outer peripheral surface of the nipple so as to face the inner peripheral surface of the holding ring. An annular seal material that can be elastically deformed is inserted into the shaft so as to be immovable in the axial direction, and the outer peripheral end of the annular seal material protrudes from the outer peripheral surface of the nipple and is brought into pressure contact with the inner peripheral surface of the hose. Thus, if the inner peripheral surface of the holding ring presses against the outer peripheral surface of the hose, the hose inner peripheral surface of the hose pressing portion is strongly pressed against the annular sealing material protruding from the outer peripheral surface of the nipple, and these hose inner peripheral surfaces And the annular sealing material are in close contact with each other.
Therefore, the hose and the nipple can be reliably sealed with an appropriate pressure of the retaining ring.
As a result, the hose and nipple can be prevented from leaking. Even if the hose inner peripheral surface is permanently deformed and the elastic repulsion is reduced due to long-term use, such as a synthetic resin hose, the annular sealing material is strongly bonded to it. Since it continues, a clearance does not generate | occur | produce and it can maintain the piping connection which does not have a leak and a hose pull-out over a long term.

  In the embodiment of the present invention, as shown in FIGS. 1 to 3, the nipple 1 into which the connection end of the hose H is inserted, and the holding disposed on the outer peripheral surface 1 a of the nipple 1 via the connection end of the hose H. The ring 2 includes a cap 3 that guides the holding ring 2 in a reciprocating manner in the hose insertion direction (left direction in the drawing), and a connector 4 that is provided integrally with the nipple 1. As the hose H inserted between the ring 2 is pulled out in the reverse direction, the holding ring 2 is moved in the reverse direction along the inner peripheral surface 3a of the cap 3 and tightened in the radial direction. The inner peripheral surface 2a of No. 2 is pressed against the outer peripheral surface H1 of the connection end of the hose H to connect the hose H so that it cannot be pulled out.

  The nipple 1 is a hard material such as a metal such as brass or a hard synthetic resin, and is formed in a cylindrical shape having an outer diameter substantially the same as or slightly larger than the inner diameter of the hose H, or a stainless steel or the like. A plate material made of a deformable rigid material is formed into a thin cylindrical shape by pressing or other forming process.

  An annular recess 1b extending in the circumferential direction is formed on the outer peripheral surface 1a of the nipple 1 so as to face an inner peripheral surface 2a of the holding ring 2 described later, and an annular seal material 1c that can be elastically deformed is formed in the annular recess 1b. It is preferable to fit and hold the axial seal so as to be immovable, and to project the outer peripheral end of the annular sealing material 1c from the nipple outer peripheral surface 1a and press-contact with the inner peripheral surface H2 of the hose H.

  In addition, the opening end 1d at the tip of the nipple outer peripheral surface 1a in the hose pulling direction (right direction in the drawing) is inclined in a taper shape with a gradually decreasing diameter toward the hose pulling direction, and close to the base end opposite to this. Has attached the cap 3 mentioned later immovably in the hose insertion direction and the hose extraction direction (right direction in the drawing).

  The cap 3 is made of the same material as the nipple 1 and is formed in a substantially cylindrical shape having an inner diameter much larger than the outer diameter of the hose H. The inner peripheral surface 3a is used as a fastening means for the holding ring 2 described later. The holding ring 2 is tightened in the radial direction by inclining in a tapered shape with a gradually decreasing diameter toward the tip of the hose pull-out direction and moving the holding ring 2 in the hose pull-out direction along the inner peripheral tapered surface 3a. The diameter is reduced and deformed.

Furthermore, it is preferable that the opening edge 3b disposed at the tip of the cap 3 in the hose pulling direction protrudes in the hose pulling direction from the tapered opening end 1d of the nipple 1.
Thereby, a mark portion 2e of the holding ring 2 described later is easily deformed, and it is easy to get over the opening edge 3b of the cap 3.

  The holding ring 2 is formed in a substantially cylindrical shape with an elastically deformable material such as a polyacetal resin or a synthetic resin having excellent slipperiness and heat resistance on the other surface, and the inner peripheral surface 2a of the retaining ring 2 is formed on the nipple 1. By forming a plurality of concave and convex portions at appropriate intervals in the hose insertion direction so as to be substantially parallel to the outer peripheral surface 1a and increasing the frictional resistance with the hose outer peripheral surface H, The holding ring 2 is easily interlocked with the pulling operation.

  The outer peripheral surface 2c of the holding ring 2 is inclined in a tapered shape that gradually becomes smaller in diameter toward the hose pulling direction substantially parallel to the inner peripheral tapered surface 3a of the cap 3.

  In addition, as shown in FIGS. 1 and 2, the holding ring 2 is formed with a plurality of slits 2d extending in the circumferential direction from the opening end in one or both of the hose insertion direction and the hose extraction direction, It is easy to elastically deform in the radial direction.

At the tip of the holding ring 2 in the hose pull-out direction, a mark portion 2e that protrudes outward from the opening 3c of the cap 3 due to the reverse movement of the holding ring 2 as the hose H is pulled out is provided.
The mark portion 2e is preferably provided with a locking means 2f for holding the protruding state of the holding ring 2.

  Further, the inner peripheral surface 2a of the holding ring 2 is formed with a reverse taper portion 2h having a gradually decreasing diameter from the tip opening 2g side toward the hooking portion 2b, thereby facilitating insertion of the hose H. It is preferable.

Further, the nipple 1 is provided with a connection tool 4 for connection to a hose connection port (not shown) of another device, and an external thread is engraved on the outer peripheral surface of the hose connection port of the other device. If the inner screw portion 4a corresponding to this is engraved in the connector 4, and if the inner screw portion is engraved on the inner peripheral surface of the hose connection port, the corresponding outer screw The part is engraved in the connector 4.
Embodiments of the present invention will be described below with reference to the drawings.

  In the first embodiment, as shown in FIGS. 1 (a) to 1 (b) and FIG. 2, the nipple 1 is a thick cylindrical body, and the annular convex portion 1e is substantially entirely disposed on the base end side in the hose insertion direction. By forming the base end inner peripheral surface 3d of the cap 3 on the outer peripheral surface of the annular convex portion 1e so as to be immovable in the hose insertion direction and the hose extraction direction, the annular convex portion is formed. 1e is formed with a hose contact surface 1f facing the cut surface H3 of the inserted hose H and a ring contact surface 1g facing the base end surface 2i of the holding ring 2 in the hose insertion direction.

  Further, if necessary, a hose confirmation through hole 1h is opened between the hose contact surface 1f and the ring contact surface 1g, and the insertion position of the connection end of the hose H is confirmed through the through hole 1h. It is also possible to make it possible.

  As a specific example of the locking means 2f for holding the protruding state of the holding ring 2, a locking claw that engages with the opening edge 3b at the tip of the cap 3 in the hose pull-out direction is formed to protrude, and the hose H is pulled out. The lock claw 2f that has moved backward in this manner is locked so as not to move in the hose insertion direction with the opening edge 3b of the cap 3, so that the holding ring 2 cannot enter the cap 3.

  Further, in the illustrated example, the nipple 1 is a cut product obtained by cutting a cylindrical material by, for example, cutting, and an inner screw portion 4a is cut as the connection tool 4 at the base end portion in the hose insertion direction. The provided nut is integrally formed.

Next, such a hose coupling hose connection method will be described in the order of steps, and the effects obtained by the method will also be described.
First, as shown by the solid line in FIG. 1A, the connecting end portion of the hose H is inserted into the insertion space S defined between the outer peripheral surface 1a of the nipple 1 and the inner peripheral surface 2a of the holding ring 2. Then, after coming into contact with the retaining ring 2 and proceeding straight as it is, the cut surface H3 of the hose H comes into contact with the hose abutting surface 1f and stops, as shown by a two-dot chain line in FIG. The contact holding ring 2 is also pushed in the same direction, and its base end face 2i comes into contact with the ring abutting face 1g and stops.

  In this state, it is visually confirmed that the cut surface H3 of the hose H is in contact with the hose contact surface 1f through the through hole 1h as necessary.

Thereafter, as shown in FIG. 1B, when the hose H is pulled back slightly in the reverse direction, the retaining ring 2 also moves backward in the same direction due to the frictional resistance with the hose H, and the ring outer peripheral surface 2c becomes the tapered surface 3a of the cap 3. The diameter is gradually reduced by sliding along.
Thereby, the latching part 2b of the inner peripheral surface 2a protrudes toward the outer peripheral surface 1a of the nipple 1 and bites into the hose outer peripheral surface H1, and the holding ring 2 and the hose H are integrated.

Thereafter, when the hose H is further pulled out in the opposite direction, the mark 2e provided at the tip of the holding ring 2 in the hose pull-out direction protrudes outward from the tip opening 3c of the cap 3, and the position of the holding ring 2 as a whole is visually observed. Can be confirmed.
As a result, the latching portion 2b of the inner peripheral surface 2a of the holding ring 2 further protrudes toward the outer peripheral surface 1a of the nipple 1 and continues to press against the outer peripheral surface H1. Continue to keep firmly fixed.

When the locking claw of the locking means 2f formed on the mark portion 2e is engaged with the tip opening edge 3b of the cap 3, the entire holding ring 2 is locked so as not to move in the hose insertion direction. .
As a result, even if the hose H is pushed in the insertion direction or an impact such as vibration occurs, the holding ring 2 does not move into the hose insertion direction and enter the cap 3, and as a result, the connection end of the hose H There is no slack in the holding force against the part.

  Further, in this state, the mark portion 2e of the holding ring 2 protrudes from the tip opening 3c of the cap 3, and the protruding state is held by the lock claw 2f. It can be confirmed visually that the work has been completed.

  Further, the hose inner peripheral surface H2 is pressure-bonded to the outer peripheral surface 1a of the nipple 1 by the latching portion 2b of the holding ring 2 reduced in diameter by the taper surface 3a of the cap 3, so that the hose inner peripheral surface H2 also has the nipple 1 Since the portion facing the annular sealing material 1c protruding from the outer peripheral surface 1a is compressed more strongly than the other portions, the portion is further compressed and deformed to increase the sealing strength.

  In the second embodiment, as shown in FIGS. 3A to 3B, the nipple 1 is a thin cylindrical body, and an inner tube portion 1i is integrally formed on the proximal end side in the hose insertion direction. An outer tube portion 3e having a slightly larger diameter is integrally formed on the base end side of the cap 3, and the inner tube portion 1i of the nipple 1 and the outer tube portion 3e of the cap 3 are fitted and integrated by a fixing means. Between the outer tube portion 3e of the cap 3 and the inner peripheral tapered surface 3a, a hose abutting surface 3f facing the cut surface H3 of the inserted hose H, and a hose insertion direction of the holding ring 2 Unlike the first embodiment shown in FIGS. 1 to 2, the configuration in which the ring contact surface 3g facing the base end surface 2i is different from that of the first embodiment shown in FIGS. The same thing.

As a means for fixing the inner tube portion 1i of the nipple 1 and the outer tube portion 3e of the cap 3, for example, partial deformation such as punching, welding, fitting, or connection by an adhesive can be considered.
Further, if necessary, a hose confirmation through hole 3h is opened between the hose contact surface 3f and the ring contact surface 3g, and the insertion position of the connection end of the hose H is confirmed through the through hole 3h. It is also possible to make it possible.

  In the case of the illustrated example, the nipple 1 is a press-processed product obtained by deforming a metal pipe by press processing or the like, and a nut is loosely inserted as the connection tool 4 at the base end portion in the hose insertion direction. The nut 4 is rotated by rotatably engaging a convex portion 4b projecting from one end opening of the nut 4 and a flange portion 1j formed to project radially outward from the base end of the nipple 1. While freely locking, the nut 4 is rotated and the inner screw portion 4a is screwed into the outer screw portion (not shown) of the hose connection port of the other device. It is connected to the hose connection port.

  Accordingly, the second embodiment shown in FIGS. 3A to 3B can obtain the same operation and effect as the first embodiment described above. Further, when the nipple 1 is a press-worked product, the first embodiment is obtained. There is an advantage that a significant cost reduction can be achieved compared to the cut product.

In the previous embodiment, the case where the locking means 2f for holding the protruding state of the holding ring 2 is a lock claw that engages with the opening edge 3b of the cap 3 is shown, but the present invention is not limited to this. The protruding state of the holding ring 2 may be held by a locking means other than the lock claw.
Furthermore, although the nut was provided as the connection tool 4 for connecting the nipple 1 to the hose connection port of another device, the present invention is not limited to this, and other than the nut may be used.

It is a vertical front view which shows one Example of the hose coupling of this invention, (a) shows the state before hose connection, (b) has shown the state after hose connection. FIG. 2 is an enlarged cross-sectional side view taken along line (2)-(2) in FIG. 1. It is a vertical front view which shows the other Example of the hose coupling of this invention, (a) shows the state before hose connection, (b) has shown the state after hose connection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nipple 1a Outer peripheral surface 1b Annular recessed part 1c Annular sealing material 1d Open end 1e Annular convex part 1f Hose abutting surface 1g Ring abutting surface 1h Through hole 1i Inner tube 1j Jade 2 Holding ring 2a Inner circumferential surface 2b Hook 2c Outer peripheral surface 2d Slot 2e Mark 2f Locking means (lock claw)
2g Tip opening 2h Reverse taper part 2i Base end face 3 Cap 3a Inner peripheral surface (tapered face) 3b Opening edge 3c Tip opening 3d Base end inner peripheral face 3e Outer tube part 3f Hose end face 3g Ring end face 3h Through hole 4 Connector 4a Inner screw part 4b Convex part H Hose H1 Outer peripheral surface H2 Inner peripheral surface H3 Cut surface S Insertion space

Claims (3)

A holding ring (2) facing the nipple (1) is provided so as to reciprocate in the insertion direction of the hose (H) along the inner peripheral surface (3a) of the cap (3). The nipple (1) and the holding ring When the hose (H) inserted between (2) is pulled out, the inner peripheral surface (2a) of the retaining ring (2) is pressed against the outer peripheral surface (H1) of the hose (H) and cannot be pulled out. Hose coupling
A hose coupling characterized in that the retaining ring (2) is provided with a mark portion (2e) protruding outward from the opening (3c) of the cap (3) by reverse movement accompanying pulling of the hose (H). A locking means (2f) that engages with the opening edge (3b) of the cap (3) is formed in the mark portion (2e), and the locking means (2f) that has moved backward by pulling out the hose (H) is provided. The hose joint is characterized in that the opening edge (3b) of the cap (3) and the hose insertion direction are immovably locked. An annular recess (1b) extending in the circumferential direction is formed on the outer peripheral surface (1a) of the nipple (1) so as to face the inner peripheral surface (2a) of the holding ring (2), and the annular recess (1b) is formed in the annular recess (1b). An annular seal material (1c) that can be elastically deformed is fitted and held so as not to move in the axial direction, and the outer peripheral end of the annular seal material (1c) is projected from the outer peripheral surface (1a) of the nipple (1). The hose coupling according to claim 1 or 2, wherein the hose (H) is in pressure contact with the inner peripheral surface (H2).

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