JP4663507B2 - Fitting - Google Patents

Description

  The present invention relates to a joint capable of attaching and detaching (detaching) a tubular body with a simple operation.

  Conventionally, when fixing a metal fitting constituting a joint to a hose, the hose is inserted into a metal pipe formed on the metal fitting, and the pipe is fixed to the hose by using a crimping machine. Further, an O-ring or the like disposed inside the joint is used for sealing the hose and the joint (see, for example, Patent Document 1).

However, with such a metal fitting, a dedicated caulking machine for fixing the metal fitting to the hose is required, and the work of fixing takes time. Moreover, once the metal fitting is crimped on the hose, the metal fitting cannot be removed from the hose and reused. Furthermore, although the O-ring is liable to cause fluid leakage due to sag or flat deformation, it cannot be repaired because the metal fitting is crimped to the hose.
JP-A-8-103837

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a joint capable of attaching and detaching (detaching) a tubular body such as a hose by a simple operation.

  In order to solve the above-mentioned problem, a joint according to the first aspect of the present invention is a joint that is detachably fixed to a pipe body, the joint body inserted into the pipe body, and the joint body A projecting portion that projects from the peripheral surface of the tubular body and contacts the mouth of the tubular body to position the tubular body, a movable member that is provided and movable in the axial direction of the tubular body, and the projecting portion, An elastic first bag-like portion provided between the moving members and enclosing a fluid therein, and provided between the joint body and the tubular body, and enclosing the fluid therein A stretchable second bag-shaped portion communicating with the bag-shaped portion; and provided between the second bag-shaped portion and the tubular body, and presses the inner wall of the tubular body when the second bag-shaped portion is inflated. A fixed claw for holding the tube and protruding from the protruding portion into the tubular body, the fixed claw being pushed out in a radial direction, The inner wall when pressed in, is characterized by having a lock member for locking the fixed blade enters the inside of the fixing claw.

  According to the first aspect of the present invention, the joint body is inserted into the tube body, and the tube body is positioned by the mouth portion of the tube body coming into contact with the protruding portion. Between the projecting portion and the moving member that moves in the axial direction of the tube body, an elastic first bag-like portion in which a fluid is sealed is provided, and when the moving member is moved in the direction of the projecting portion The first bag-like portion is crushed. A stretchable second bag-like portion communicating with the first bag-like portion is provided between the joint body and the tube body, and when the first bag-like portion is crushed, The fluid moves to the second bag-like portion, and the second bag-like portion expands. A fixed claw is provided between the second bag-like portion and the tube body, and the tube body is held by the joint body when the fixed claw presses the inner wall of the tube body. At that time, the locking claw protruding from the protruding portion toward the inside of the tube enters the inside of the fixing claw, so that the fixing claw is locked. For this reason, it becomes possible to firmly fix the tube body to the joint body.

  Further, when the tubular body is detached from the joint body, the moving member is moved in a direction away from the protruding portion. As a result, the internal pressure of the second bag-shaped portion is lowered (the pressing force of the second bag-shaped portion on the inner wall of the tube body is released), the lock of the lock member entering the inside of the fixed claw is released, and the tube body is It can be pulled out from the joint body. Therefore, the tube body can be attached to and detached from the joint body by a simple operation.

  According to a second aspect of the present invention, in the joint according to the first aspect, the second bag-shaped portion is an annular body, and the second bag-shaped portion is connected to the first bag through a connecting pipe penetrating the protruding portion. It is characterized by being communicated with the shaped part.

  According to invention of Claim 2, the fluid in a 1st bag-like part moves to an annular body through a connection pipe, and the annular body as a 2nd bag-like part expand | swells. For this reason, since the fixed claw is pushed out in the radial direction by the annular body and presses the inner wall of the tubular body, the tubular body is reliably held.

  According to a third aspect of the present invention, in the joint according to the first or second aspect, the moving member is a nut that is screwed into a threaded portion of a peripheral surface of the joint body.

  According to invention of Claim 3, a 1st bag-shaped part is crushed by tightening the nut screwed by the thread part of the surrounding surface of a coupling main body in the direction of a protrusion part, and a 2nd bag-shaped part Expands and the tubular body is held by the fixed claw. Further, when the tube body is detached, the nut is turned back to the original position, and the tube body is pulled out from the joint body. For this reason, the attachment / detachment operation of the joint becomes easy.

  The invention according to claim 4 is the joint according to any one of claims 1 to 3, wherein the fixed claw is formed of a stretchable annular member having a claw portion formed on a peripheral surface thereof. A diameter of the second bag-like portion is expanded when the second bag-like portion is inflated, and the second bag-like portion bites into the inner wall of the tubular body.

  According to the invention described in claim 4, when the second bag-like portion is inflated, the stretchable annular member expands in diameter, and the claw portion of the annular member bites into the inner wall of the tubular body. At that time, since the entire circumferential direction of the inner wall of the tubular body is pressed by the claw portion of the annular member, the tubular body and the joint body are sealed by the annular member.

  According to a fifth aspect of the present invention, in the joint according to any one of the first to fourth aspects, the fixed claw pushed by the lock member enters the insertion tip of the joint body. It is characterized in that a projection for restricting the diameter of the fixed claw is provided.

  According to the fifth aspect of the present invention, the protrusion is provided at the insertion tip of the joint body, and the fixed claw pushed by the lock member enters the protrusion, thereby restricting the diameter of the fixed claw. For this reason, the pressing force to the tubular body of the fixed claw is maintained, and the tubular body can be held more reliably.

  Since the joint according to the present invention is configured as described above, the joint can be attached to and detached from a tubular body such as a hose by a simple operation.

  Embodiments of the joint of the present invention will be described below with reference to the drawings.

  FIG. 1 is a half-cut sectional view showing a first embodiment of a joint 10 according to the present invention, and shows a state before the joint 10 is fixed to a hose 30.

  As shown in FIG. 1, the joint 10 includes a cylindrical joint body 12 that is inserted into a hose 30. The joint body 12 is provided with a projecting portion 14 projecting from the peripheral surface, and the hose 30 is positioned by bringing the mouth portion of the hose 30 into contact with the projecting portion 14.

  On the peripheral surface of the joint body 12, a male thread 15 is formed on one side of the protrusion 14 (opposite to the hose 30), and a nut 16 is screwed onto the male thread 15 to move in the axial direction of the joint body 12. It is possible.

  On the peripheral surface of the joint body 12, a stretchable first bag-like portion 18 is disposed between the protruding portion 14 and the nut 16. In addition, a stretchable second bag-like portion 20 is disposed between the joint body 12 and the hose 30 on the side opposite to the nut 16 of the protruding portion 14. The first bag-like portion 18 and the second bag-like portion 20 are communicated with each other by a stretchable connecting pipe 22. The connecting pipe 22 is penetrated through an opening 14 </ b> A formed at the base of the protruding portion 14.

  The first bag-shaped portion 18 and the second bag-shaped portion 20 are filled with a fluid 24 having viscosity inside, and the fluid 24 is between the first bag-shaped portion 18 and the second bag-shaped portion 20. It is movable through the connecting pipe 22. That is, when the fluid 24 moves from the first bag-shaped portion 18 to the second bag-shaped portion 20, the second bag-shaped portion 20 expands.

  Between the 2nd bag-shaped part 20 and the pipe body 30, the annular member 32 provided with the fixed nail | claw 32A which presses the inner wall of the hose 30 at the time of expansion | swelling of the 2nd bag-shaped part 20 is arrange | positioned. A plurality of fixed claws 32 </ b> A are formed in a direction orthogonal to the axial direction of the hose 30, and the angle of the fixed claws 32 </ b> A is formed in a direction that suppresses pulling of the hose 30. As shown in FIGS. 4A and 4B, the annular member 32 has stretchability, and can be expanded and contracted in the radial direction. Then, when the fluid 24 moves from the first bag-like portion 18 to the second bag-like portion 20 and the second bag-like portion 20 expands, the annular member 32 extends and the hose 30 as shown in FIG. It is comprised so that the inner wall of this may be pressed (refer FIG. 2).

  As the material of the annular member 32, an elastic material such as rubber is used. For example, SBR, NBR, EPDM, silicone rubber, fluorine rubber, IIR (butyl rubber), natural rubber, or the like is used.

  As shown in FIG. 1 and FIG. 2, a protrusion 26 is formed at the distal end of the joint body 12 on the second bag-like portion 20 side and projects radially outward from the end of the second bag-like portion 20. Yes. A pair of pointed protrusions 34 and 35 protruding toward the inside of the hose 30 are formed at a position where the protrusion 26 and the protrusion 14 are opposed to each other. These protrusions 34 and 35 are made of an elastic member such as resin. When the diameter of the annular member 32 is increased, the protrusions 34 and 35 enter the inner side (inner peripheral surface) of the annular member 32 by elastic deformation. Is configured to be locked.

  As the material of the expansion and contraction portions of the first bag-shaped portion 18, the second bag-shaped portion 20, and the connecting pipe 22, an elastic material such as rubber is used. For example, SBR, NBR, EPDM, silicone rubber, fluororubber, IIR ( Butyl rubber) and natural rubber are used. Moreover, as the fluid 24, a liquid, a fluid with high viscosity, etc. can be used. For example, as the fluid 24, silicone oil, mineral hydraulic oil, grease, or the like is used. The joint 10 is made of metal such as stainless steel, but is not necessarily limited to metal, and may be made of plastic, for example. The hose 30 is made of rubber or resin.

  Further, a protective portion 16 </ b> A that is bent so as to cover the first bag-shaped portion 18 from the outside is formed on the outer peripheral surface of the nut 16.

  As shown in FIG. 3 (A), the first bag-shaped portion 18 is formed of an annular body, and a small-diameter cylindrical male screw portion 18A is projected on the side surface. The male screw portion 18A is made of plastic, for example. In addition, a female screw portion (not shown) to which the male screw portion 18 </ b> A is fastened is provided at one end portion of the inner peripheral surface of the connecting pipe 22. Further, the second bag-shaped portion 20 is formed of a flat annular body, and similarly to the first bag-shaped portion 18, a small-diameter cylindrical male screw portion (not shown) protrudes from the side surface, and the inner circumference of the connecting pipe 22. Fastened to the female screw portion 22A formed at the other end of the surface. And as shown in FIG.3 (B), the external thread part of the 2nd bag-shaped part 20 is fastened to the internal thread part 22A of the connection pipe 22 in the fluid 24 with which the inside of the bathtub which is not shown in figure was filled, and the 1st bag The male screw portion 18 </ b> A of the shaped portion 18 is fastened to the female screw portion of the connecting pipe 22. As a result, the first bag-shaped portion 18, the second bag-shaped portion 20, and the connecting pipe 22 are integrated, and the fluid 24 is filled therein.

  Next, the operation of the joint 10 will be described.

  As shown in FIG. 1, when the hose 30 is attached to the joint 10, the inside of the hose 30 is inserted outside the second bag-shaped portion 20 of the joint body 12. And the 1st bag-shaped part 18 is crushed by tightening the nut 16 to the direction of the protrusion part 14 (arrow A direction). As a result, as shown in FIG. 2, the fluid 24 in the first bag-shaped portion 18 moves to the second bag-shaped portion 20 through the connecting pipe 22, and the second bag-shaped portion 20 expands.

  When the second bag-like portion 20 expands, the diameter of the annular member 32 is expanded, and the fixing claw 32A presses the inner wall of the hose 30, whereby the hose 30 is held by the joint body 12. At this time, the annular member 32 is pushed by the protrusion 34 of the protruding portion 14 and the protrusion 35 of the protruding portion 26 and the protrusions 34 and 35 are elastically deformed, and the protrusions 34 and 35 are formed on the inner side (inner peripheral surface) of the annular member 32. Enters. Thereby, the annular member 32 is locked, and the diameter reduction of the annular member 32 is prevented.

  The annular member 32 is stretchable, and the fixing claw 32A bites into the inner wall of the hose 30 and adheres firmly to the entire circumferential direction, so that the hose 30 and the joint 10 can be sealed. Moreover, since the diameter of the annular member 32 is prevented by the two protrusions 34 and 35, the pressing force of the fixing claw 32A to the hose 30 is maintained, and the hose 30 can be firmly fixed to the joint 10. For this reason, the annular member 32 is reduced in diameter when the joint 10 is used, and the hose 30 can be prevented from being inadvertently detached from the joint body 12.

  On the other hand, when the hose 30 is detached from the joint 10, the nut 16 is turned in a direction away from the protruding portion 14 and returned to its original state. Thereby, the internal pressure of the 2nd bag-like part 20 falls (the pressing force of the 2nd bag-like part 20 to the inner wall of the hose 30 is released), the projections 34 and 35 are elastically deformed, and the annular member 32 becomes the projection 34, By moving to the inside of 35, the lock of the annular member 32 is released. Thereby, the hose 30 can be extracted from the joint body 12.

  In such a joint 10, a dedicated crimping machine for fixing to the hose 30 is not required, and the labor of the operation is reduced. In addition, the hose 30 is held by the fixed claw 32A of the annular member 32, and the fixed claw 32A is locked by the protrusions 34 and 35, so that the hose 30 is securely held on the joint body 12. Further, the joint 10 can be attached to and detached from the hose 30 by a simple operation, and the joint 10 can be detached and reused. Furthermore, since the joint 10 and the hose 30 are sealed by the fixing claw 32A, it is possible to reduce the occurrence of fluid leakage due to sag or flat deformation when an O-ring is used. Even if the holding force of the joint 10 is reduced, the annular member 32 having the fixing claws 32A, the second bag-like portion 20, the first bag-like portion 18 and the like may be replaced, so that the repair becomes easy.

  In addition, as shown in FIGS. 5A and 5B, a stretchable spherical first bag-like portion 42 may be used instead of the first bag-like portion 18 of the joint 10. By fastening the male screw portion 42A of the first bag-like portion 42 to the female screw portion 22A of the connecting tube 22, the second bag-like portion 20 and the first bag-like portion 42 are integrated via the connecting tube 22. . The first bag-like portion 42 is disposed inside the protection portion 16 </ b> A of the nut 16.

  In the above embodiment, a plurality of the fixing claws 32A are formed on the peripheral surface of the stretchable annular member 32, but the present invention is not limited to this configuration. For example, the structure which forms the fixed nail | claw 32A in the surrounding surface of the curved piece cut into plurality, expands a curved piece to radial direction, and presses the inner wall of the hose 30 may be sufficient.

  In the above embodiment, the first bag-like portion and the second bag-like portion are not limited to the above shapes. If it is the structure which extrudes a fixed nail | claw to the inner wall side of a hose by a 2nd bag-shaped part, it can set suitably.

It is a half cut sectional view showing the joint of a 1st embodiment of the present invention. (A) is a half-cut sectional view showing a state in which the joint shown in FIG. 1 is mounted on a hose, and (B) is a sectional view of the joint taken along line AA. It is the disassembled perspective view which shows the 1st bag-like part used for the joint shown in FIG. 1, a connection pipe, and the 2nd bag-like part, and the perspective view at the time of a coupling | bonding. FIG. 2 is a half-sectional view showing an annular member used in the joint shown in FIG. 1, and is a diagram showing a normal state and a state when the diameter is expanded. It is a disassembled perspective view which shows the modification of a 1st bag-like part, a connecting pipe, and a 2nd bag-like part, and a perspective view at the time of a coupling | bonding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Joint 12 Joint main body 14 Protruding part 14A Opening hole 15 Male thread 16 Nut (moving member)
18 1st bag-shaped part 18A Male thread part 20 2nd bag-shaped part 22 Connecting pipe 22A Female thread part 24 Fluid 26 Protrusion part 30 Hose (tube)
32 annular member 32A fixing claw 34 protrusion (lock member)
35 Projection 42 First Bag Part 42A Male Thread Part

Claims (5)

A joint that is detachably fixed to a pipe body,
A joint body inserted into the pipe body;
A protrusion that projects from the peripheral surface of the joint body, contacts the mouth of the tube, and positions the tube;
A movable member provided so as to be movable in the axial direction of the tubular body, and fixed;
A stretchable first bag-like portion provided between the projecting portion and the moving member and enclosing a fluid therein;
A stretchable second bag-shaped portion provided between the joint body and the pipe body, in which a fluid is sealed and communicated with the first bag-shaped portion;
A fixing claw provided between the second bag-shaped portion and the tubular body, and pressing and holding the inner wall of the tubular body when the second bag-shaped portion is inflated;
A locking member that protrudes from the protruding portion into the tubular body and enters the inside of the fixed claw and locks the fixed claw when the fixed claw is pushed out in a radial direction and presses the inner wall of the tubular body; ,
A joint characterized by comprising:   The said 2nd bag-shaped part is a cyclic | annular body, The said 2nd bag-shaped part is connected to the said 1st bag-shaped part through the connection pipe which penetrated the said protrusion part, The Claim 1 characterized by the above-mentioned. Fittings.   The joint according to claim 1, wherein the moving member is a nut that is screwed into a threaded portion of a peripheral surface of the joint body.   2. The fixed claw is made of a stretchable annular member having a claw portion formed on a peripheral surface thereof, and expands when the second bag-like portion expands and bites into an inner wall of the tubular body. The joint according to any one of claims 1 to 3.   The insertion tip portion of the joint body is provided with a protrusion that the fixed claw pushed by the lock member enters and restricts the diameter of the fixed claw. The joint according to claim 1.

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