JPH0445718B2 - - Google Patents

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a flexible pipe joint.

[Background technology]

For example, in addition to installing conductive cords between machinery and equipment in factories or between machinery equipment and their control panels, conductive cords may be placed bare or wrapped in flexible tubes; In the case of encasing and deploying, a flexible pipe joint as shown in FIG. 4 is used.

The flexible pipe joint shown here is for connection to the control panel mentioned above, and is constructed as follows. In other words, the joint piece 1, which is the main part of the joint, includes an end receiving flange 2, a connecting screw part 3 integrally formed on one side in the axial direction,
A connecting pipe part 4 is integrally formed on the other side in the axial direction, and a piece through hole 5 is formed through the center thereof. A fastener 6 that is screwed onto the joint piece 1 is a cap nut, and a presser projection 7 that projects in the inner diameter direction is formed at one end of the fastener 6. A pipe retainer 8 is provided inside the connecting pipe portion of the joint piece 1 . flexible tube 1
3 includes an elastic protective covering 9 made of synthetic resin, rubber, etc. and an inner tube 10 made of metal, and has a spiral outer groove 11 formed on the outer periphery and a spiral inner groove 12 formed on the inner periphery as well. The pipe retainer 8 includes a holding pipe portion 14 screwed onto the inner periphery of the end of the flexible pipe 13, a flexible pipe 13, and a joint piece 1.
It consists of a retainer flange 15 sandwiched between, an outer tube section 16 located between the outer periphery of the flexible tube 13 and the joint tube section 4 of the joint piece 1, and a tapered receiving tube section 17. This tube retainer 8 is
It has the function of holding the end of the flexible tube 13 on the joint piece 1 side and protecting the end.

In this pipe joint, in order to prevent the flexible pipe 13 from coming off from the joint piece 1 side, a gasket is provided between the flexible pipe 13, the fastener 6, and the joint piece 1 with tapered surfaces at both ends. 18 is inserted so that the inner circumferential protrusion 19 of this coupling packing 18 fits into the spiral outer circumferential groove 11 of the flexible tube 13.

When using this pipe joint, the joint is screwed onto the end of the flexible pipe 13 with the fastener 6 left in a slightly loosened state. After the end of the flexible pipe 13 is screwed into the space between the pipe retainer 8 and the pipe retainer 8, the fastener 6 is tightened and the packing 18 is fitted, thereby fixing the joint to the end of the flexible pipe 13. Ru.

However, since the joint is attached with the fastener 6 loosened as described above, there is an inconvenience that the gasket 18 rotates with screwing, making screwing virtually impossible or difficult. It is also possible to tighten the gasket 18 with the fastener 6 before screwing in, but in that case, the gasket 18
As the flexible tube 13 is tightened, it may bulge inward and become smaller in diameter, so it does not match the outer diameter of the flexible tube 13, making it difficult to screw in. For this reason, it is necessary to disassemble the joint again at the site and assemble each part one by one in the predetermined positions shown in Figure 4, which is a very time-consuming process. Since it is necessary to tighten the screws, a separate vise stand is required for this purpose, and the work is extremely labor-intensive, which is a problem. Furthermore, the degree of connection of the flexible tube 13 with the packing 18 largely depends on the degree of tightening of the fastener 6, so if the fastener 6 loosens, the degree of connection will weaken, and for example, the degree of connection of the flexible tube 13 will become weaker. There was also a problem that the seal would come off or the sealing performance would be impaired.

Incidentally, joints for air piping, gas piping, etc. have a one-touch attachment/detachment structure with a built-in lock piece 21, as shown in FIGS. 5 and 6.

The connecting pipe portion 23 of the joint piece 22 provided in this pipe joint has a tapered lock piece hole 24.
is formed, and a ball-shaped lock piece 21
is fitted so as to be movable in the radial direction. The inward diameter of the lock piece hole 24 is formed to be smaller than the diameter of the lock piece 21, so that the lock piece 21 can protrude from the connecting pipe portion 23 in both the inner and outer diameter directions. ing. A lock sleeve 25 is provided on the outer periphery of the connecting pipe portion 23, and this lock sleeve 25 has a lock cam 2 which is a small diameter portion in the middle in the axial direction.
It is equipped with 6. The lock sleeve 25 is pushed in the direction of the stop ring 28 by a lock spring 27, and normally the lock piece 21 can be pushed in the inner radial direction by a lock cam 26 into the locked state, as shown in FIG. On the other hand, when the lock piece 21 is operated in the direction of the arrow, the lock piece 21 is allowed to protrude in the direction of the outer diameter, as shown in FIG. 6, and the lock piece 21 is released. An insertion joint 29 that fits into the coupling piece 22 in a one-touch manner has a locking groove 30 on the outer periphery of one axial side, and a receiving nut 31 and a connecting pipe section on the outer periphery of the other axial side. It is equipped with 32.
A lock nut 33 is screwed into this insertion joint 29, and a pipe 34 for air, gas, etc. is tightened and connected between it and the connecting pipe portion 32.

As shown in FIG. 6, the pipe joint configured in this way can be used to open the fitting with the pipe 34 connected by operating the lock sleeve 25 in the direction of the arrow so that the lock piece 21 can protrude in the outer diameter direction. The locking joint 29 can be inserted into the joint piece 22 in the direction of the arrow, and after insertion, the lock sleeve 2
When the operating force 5 is removed, the lock sleeve 25 is returned to its original position by the force of the lock spring 27, and as a result, the lock piece 21 is fitted into the lock groove 30 as shown in FIG. The insertion joint 29 is automatically locked on the side. At the time of removal, if the lock sleeve 25 is operated in the direction of the arrow, the lock piece 21 can be moved in the outer diameter direction, so that it can be pulled out by operating the insertion joint 29 in the direction opposite to the arrow.

As described above, according to the above-mentioned pipe joint for air and gas, the pipe 34 can be attached and detached with a so-called one-touch operation, but since the lock nut 33 is used to connect the pipe 34 itself to the insertion joint 29, The connection work was required as a separate initial work. Further, the pipe joint is equipped with an O-ring 35 to ensure sealing performance, and since the position of the O-ring 35 corresponds to the tip of the insertion joint 29, a reliable sealing action is always obtained. I can't.

[Purpose of the invention]

In view of the above-mentioned disadvantages, the present invention has been devised to make it possible to easily and reliably attach a flexible tube, to easily remove it, and to solve the problem of the flexible tube coming off after attachment and sealing properties. The purpose of this invention is to provide a pipe joint for flexible pipes that can be used for flexible pipes.

[Disclosure of the invention]

In order to achieve the above object, the flexible pipe fitting according to the present invention has a connecting pipe part that is open at one end and has a through hole in the center of the other end, and has a joint piece that is connected to another member. , a lock piece that is movable in the inner and outer diameter directions of the connecting tube through a lock piece hole formed in the connecting tube, and a lock piece that is provided on the outside of the connecting tube so as to be movable back and forth in the axial direction and that is movable in one direction. a lock sleeve which presses down the lock piece and causes it to protrude radially inwardly from the connecting pipe portion by moving in the other direction, and allows the lock piece to move radially outwardly from the connecting pipe portion by moving in the other direction; A lock spring biases the lock sleeve in the one direction, and the end of the flexible tube, which is provided with a spiral groove on the inner and outer circumferential surfaces and is inserted into the connecting tube section, is screwed into the outer circumferential spiral groove. It has a cylindrical packing that fits inside the connecting pipe section, and a holding tube section that screws into the inner circumferential spiral groove of the flexible tube. A tube retainer forming a space for insertion of a flexible tube therebetween is provided, and the lock piece moves in the inner radial direction and fits into the outer peripheral surface of the combined body of the packing and the tube retainer. A locking concave portion configured to prevent the connecting tube portion from coming off is provided, and a sealing protrusion is provided in an annular shape near the boundary between the tube retainer and the locking concave portion to press against the inner surface of the connecting tube portion due to elasticity. It is characterized in that the lock recess is formed by the rising surface of the seal protrusion and the tapered surface annularly provided on the outer periphery of the packing.

Hereinafter, the present invention will be explained in detail with reference to the drawings showing embodiments thereof.

FIG. 1 shows a half section of an example of a flexible pipe joint according to the present invention, and FIG. 2 shows it in an exploded view. These exemplify the legs that connect the flexible tube 13 to the control box 36. The joint piece 37 consists of an end receiving flange 38, a connecting threaded portion 39 protruding from one axial side thereof, and a connecting pipe portion 40 integrally formed on the other axial side. A piece through hole 41 is formed in the center of 39. The joint piece 37 is
The end receiving flange 38 is placed against the outer wall surface of the control box 36, and the connecting screw portion 39 is inserted into the box hole 42 of the control box 36 and is fixed by being tightened from the inside with a tightening nut 43. ing. The connecting portion 40 is a cylinder with an open end and projects from the control box 36. This connecting pipe section 40
is provided with a spring receiver 44 protruding in the outer radial direction at its protruding tip, and a ring groove 50 is formed on the outer periphery of the base side. Approximately in the middle of the connecting pipe section 40 in the axial direction, four tapered lock piece holes 45 that expand in the outer diameter direction are formed in the circumferential direction, and the inner diameter of the lock piece holes 45 is fitted into the lock piece holes 45. It is made smaller than the diameter of the ball-shaped lock piece 46. The lock piece 46 is movable in the inner diameter direction and the outer diameter direction. The connecting pipe portion 40 is provided with a cylindrical lock sleeve 47, and this lock sleeve 47 is provided with a lock cam 48, which is formed into a protrusion on the inner circumferential side by drawing, near the axially intermediate portion thereof.
Since the lock sleeve 47 is provided with a lock spring 49 made of a coil spring between the spring receiver 44 and the lock cam 48, the lock sleeve 47 is always pressed in the direction of the control box 36.
It is stopped at a fixed position in the pressing direction by a stop ring 51 that is fitted in the pressing direction. The packing 52 is made of a flexible resin material or the like, and has a threaded protrusion 54 formed on its inner peripheral surface. Patsukin 52 like this
is fitted into the connecting pipe portion 40 of the joint piece 37. As shown in FIG. 3, a pipe retainer 55 made of a metal material is caulked to the packing 52.
Alternatively, they are fixed together by adhesive. The tube retainer 55 is composed of a holding tube section 56 on the inner circumference, a coupling tube section 57 on the outer circumference, and a retainer flange 58 connecting the ends thereof, and is formed by press-molding a thin plate. Holding tube part 56
is provided with a retainer screw portion 59 protruding from the outer periphery and screwed into the inner circumferential groove 12 of the flexible tube 13. The coupling tube portion 57 is fixed to the outer periphery of one end of the packing 52. The outer periphery of this packing 52 (in the example,
periphery of the boundary end of the coupling pipe portion 57 with the packing 52)
, a seal protrusion 53 having an outer diameter slightly larger than the outer diameter of the coupling pipe portion 57 and the inner diameter of the connecting pipe portion 40 is provided.
is formed in a ring shape. Also, an annular tapered surface 6 that gently rises from one end of the packing 52 to which the coupling pipe portion 57 is fixed toward the other end.
2 is provided. Due to this tapered surface 62 and one side rising surface of the seal ridge 53,
A lock recess 60 is formed therebetween. In other words, the lock recess 60 is provided so that it is narrowed near the axial middle of the outer periphery of the packing 52. An insertion cavity 61 with one end open is formed between the tube retainer 55 and the packing 52 thus coupled, and the flexible tube 13 is screwed into this cavity 61. The flexible tube 13 has an elastic protective coating 9 on the outer periphery and a metal inner tube 10 screwed into each other, and has an outer circumferential groove 11 on the outer circumference and an inner circumferential groove 12 on the inner circumference.
are each formed in a spiral shape. Outer groove 11
, there is a screw protrusion 54 on the inner circumference of the seal 52.
However, the retainer screw portions 59 of the tube retainer 55 are screwed into the inner circumferential grooves 12, respectively.

The flexible pipe fitting configured in this way is configured by screwing the end of the flexible pipe 13 into the insertion space 61 between the pipe retainer 55 and the packing 52, and inserting it into the connecting pipe portion 40 of the joint piece 37. Insert into. As described above, since the lock recess 60 is formed by the tapered surface 62, the packing 52 to which the pipe retainer 55 is fixed can be easily inserted. During this insertion, the locking sleeve 47 is operated in the direction of arrow A in FIG. 1 so that the locking piece 46 can escape in the radial direction. By the insertion, the seal protrusion 53 is pressed and deformed by the inner surface of the connecting tube section 40, and due to its elasticity, it comes into close contact with the inner surface under pressure, thereby making the inside of the connecting tube section 40 watertight. Therefore, water and the like will not enter the inside from the outside of the joint (for example, the lock piece hole 45, etc.). The lock piece 46 is guided into the position of the lock recess 60. Therefore, if the operating force of the lock sleeve 47 is removed, the lock sleeve 47 returns to the direction opposite to the arrow A by the force of the lock spring 49.
When the lock cam 48 pushes the lock piece 46 in the radial direction, a part of the lock piece 46 fits into the lock recess 60 of the packing 52 from inside the lock piece hole 45, and prevents it from coming off in the axial direction. On the other hand, when the lock sleeve 47 is operated in the direction of arrow A, the lock piece 46 can protrude in the outer diameter direction, so the lock can be released, and the packing 52 having the flexible tube 13 and the tube retainer 55 side can be released. It can be extracted.

Thus, according to the present invention, the flexible tube 13
There is no need for the trouble of separately tightening the pipe retainer 5 with a tightening nut.
The flexible tube 13 is screwed into the inside of the packing 52 and the lock piece 46 is compressed when the packing 52 is inserted.
By fitting into the lock recess 60, the gasket 52
Since the flexible tube 13 becomes locked, there is no chance of the flexible tube 13 slipping out. In addition, the flexible tube 13 can be connected to the joint piece 37 side by the pressing action of the lock piece 46, and the connection of the flexible tube 13 is easy and reliable. Since it does not depend on tightening, no tools are required. flexible tube 13
It also makes it easier to remove. The packing 52 is used for screwing the flexible tube 13 and inserting it into the joint piece 37.
The seal ridge 53 provided on the outer periphery of the packing 52 deforms and adheres to the inner surface of the connecting pipe portion 40, and the lock piece 46 presses against the packing, thereby achieving sufficient sealing performance and preventing water from entering from the outside. Eliminate fear.

〔Effect of the invention〕

As explained above, the flexible pipe joint according to the present invention includes a joint piece that is connected to another member and has a connecting pipe portion that is open at one end and has a through hole in the center of the other end. A lock piece that is movable in the inner and outer diameter directions of the connecting tube through a lock piece hole formed in the connecting tube, and a lock piece that is provided on the outside of the connecting tube so as to be able to reciprocate in the axial direction and move in one direction. a lock sleeve which presses down the lock piece and causes it to protrude radially inwardly from the connecting pipe portion by moving in the other direction, and allows the lock piece to move radially outwardly from the connecting pipe portion by moving in the other direction; A lock spring biases the sleeve in the one direction, and an end of a flexible tube that has a spiral groove on its inner and outer circumferential surfaces and is inserted into the connecting tube section is connected in a screwed state to the outer circumferential spiral groove. It has a cylindrical packing that fits inside the tube, and a holding tube that screws into the inner circumferential spiral groove of the flexible tube. and a pipe retainer that forms a space for insertion of the flexible pipe, and the lock piece moves in the inner diameter direction and fits into the outer circumferential surface of the combined body of the packing and the pipe retainer, thereby preventing the combined body from coming out. A locking concave portion adapted to be locked is provided, and a sealing protrusion is provided in an annular shape near the boundary between the tube retainer and the locking concave portion, the sealing protrusion being brought into pressure contact with the inner surface of the connecting tube portion due to elasticity. This makes it possible to easily and reliably install flexible pipes, as well as to easily remove them.Furthermore, it extremely effectively solves the problem of flexible pipes coming off after installation and problems with sealability. It became possible to do so.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view of a flexible pipe joint according to the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 4 is a half-sectional view showing an example of a conventional flexible pipe fitting, Fig. 5 is an exploded front view showing a pipe fitting for air and gas piping, and Fig. 6 is a half-sectional view showing an example of a conventional flexible pipe fitting. FIG. 3 is a sectional view showing the state. 13...Flexible pipe, 37...Joint piece, 40...Connecting pipe portion, 41...Piece through hole, 45...Lock piece hole, 46...Lock piece, 47...Lock sleeve, 49...Lock spring, 52...Packing, 53...
Seal protrusion, 55... Pipe retainer, 56... Holding tube section, 57... Connecting tube section, 60... Lock recess, 62...
Tapered surface.

Claims (1)

[Claims] 1. A joint piece that has a connecting pipe part that is open at one end and has a through hole in the center of the other end and is connected to another member, and the inner diameter of the connecting pipe part is passed through the lock piece hole formed in the connecting pipe part. A lock piece is provided on the outside of the connecting pipe section so as to be freely movable in the axial direction and in the outer radial direction, and when the lock piece is moved in one direction, the lock piece is held down and moved from the connecting pipe section in the inner radial direction. a lock sleeve that protrudes and allows movement of the lock piece in the outer radial direction from the connecting pipe portion by movement in the other direction; a lock spring that biases the lock sleeve in the one direction; and an inner peripheral surface. and a cylindrical packing that is fitted inside the connecting pipe section with a spiral groove on the outer circumferential surface and screwed into the outer circumferential spiral groove at the end of the flexible tube inserted into the connecting pipe section; a pipe retainer having a holding tube part screwed into an inner circumferential spiral groove of the pipe and forming a space for inserting a flexible tube between the holding pipe part and the packing by being coupled to the packing; Further, a lock recess is provided on the outer circumferential surface of the combined body of the packing and the pipe retainer, and the lock piece is moved in the inner radial direction and fitted to prevent the combined body from coming off, and A seal protrusion is provided in an annular shape near the boundary of the pipe retainer and the lock concave portion, and the seal convex strip is pressed against the inner surface of the connecting pipe portion due to elasticity, and the lock concave portion is connected to the rising surface of the seal convex strip,
A flexible pipe joint characterized in that it is formed by a tapered surface annularly provided on the outer periphery of a packing.