JPH0110551Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pipe joint for connecting fluid pipes such as fluid conveying hoses and tubes, and allows for easy and reliable connection of fluid pipes such as hoses and tubes. The purpose of this invention is to provide an inexpensive pipe joint that can improve safety.

In order to achieve the above object, the present invention provides a pipe joint comprising an outer coupler and an inner coupler that can be fitted into the outer coupler, in which the outer coupler has a fluid pipe holding cylinder into which the fluid pipe can be inserted, and the inner coupler has a fluid pipe holding cylinder through which the fluid pipe can be inserted. Connecting tubes that can fit into the tube holding tubes and fix the fluid tubes are provided, and the outer coupler has a plurality of elastic tubes that surround the connecting tubes and can be locked to shoulders on the outer periphery of the connecting tubes. Locking pawls are provided, and an annular spring for biasing the locking pawls in the direction of engagement with the shoulder portion is embedded in the free ends of the locking pawls, and the annular spring is expanded to urge the locking pawls to engage with the shoulder portion. The present invention is characterized in that a knob is provided that allows the locking pawl to be removed from the shoulder portion.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Figures 1 and 2 show a pipe joint of the present invention, into which a flexible fluid pipe 1 can be inserted. It is composed of an outer coupler 2 and an inner coupler 3 that is fitted into the outer coupler 2 and fixes the fluid pipe 1.

The outer coupler 2 has a cylindrical coupler body 4 made of an elastic material such as nylon.
A plurality of elastic locking claws 5 are formed at the tip of the inner coupler 3 by making multiple cuts in the axial direction. A locking piece 5a to be engaged is provided protrudingly, and a spring holding portion 7 cut in the axial direction similarly to the locking claws 5 is integrally formed on the outer periphery of the locking claw 5. An annular spring 8 is disposed in an annular groove 7a provided on the inner surface of the locking claw 5 so as to surround the outer periphery of the locking claw 5, and both ends of the spring 8 are crossed to form a knob 8a. By pressing the knob 8a inward, the spring 8 can be expanded outward.

Inside the locking claw 5 of the outer coupler 2, a short cylindrical fluid pipe holding cylinder 11 is integrally provided to project in the axial direction from the center of the end wall of the coupler body 4.
An elbow portion 12 that smoothly bends the fluid pipe 1 to be connected through approximately 90 degrees is integrally formed on the back side of the end wall of the coupler body 4.
A fluid pipe guide groove 13 having a fan-shaped longitudinal section and formed by a bottom wall 13a having a semicircular cross section extending in an arc shape over approximately 90 degrees, and a pair of side walls 13b facing each other and extending in parallel from the bottom wall 13a. The fluid pipe guide groove 13 is rotatably hinged to the end edge portion of the fan-shaped elbow portion 12.
It is adapted to be fitted and closed by a sector-shaped fluid pipe fixing piece 14.

As shown clearly in FIG.
a is recessed, and when the fluid tube fixing piece 14 is fitted into the fluid tube guide groove 13, the fluid tube 1 accommodated in the fluid tube guide groove 13 is inserted into the arc-shaped bottom wall 1 of the fluid tube guide groove 13.
The fluid pipe fixing piece 1 is smoothly bent along 3a.
It is designed to be fixedly held by the arcuate outer circumferential surface of No. 4.

A locking hole 1 is provided in both side walls 13b of the fluid pipe guide groove 13.
5 is bored, and the fluid pipe fixing piece 14 has locking protrusions on both sides thereof that lock into the locking hole 15 and hold it fixed when it is fitted into the fluid pipe guide groove 13. 16 is provided protrudingly.

The inner coupler 3 is connected to the engagement claw 5 of the outer coupler 2.
It has a connecting cylinder 17 that is inserted into the fluid pipe holding cylinder 11 and fitted on the outer periphery of the fluid tube holding cylinder 11, and the outer periphery of the tip of the connecting cylinder 17 is tapered to facilitate insertion into the locking claw 5. A locking claw 5 is provided on the outer periphery of the proximal end.
A shoulder portion 17a is formed which can be locked by a locking piece 5a.

The connecting cylinder 17 of the inner coupler 3 has a large diameter hole 18a slightly larger than the outer diameter of the fluid pipe holding cylinder 11 of the outer coupler 2 and a small diameter hole 18b slightly larger than the outer diameter of the fluid pipe 1. , its small diameter hole 1
A fluid passage 19 is opened in 8b.

The fluid pipe 1 inserted into the fluid pipe guide groove 13 and the fluid pipe holding cylinder 11 has one end _e1 extending from the tip opening of the holding cylinder 11 and fitted into the small diameter hole 18b. There is a small diameter hole 1 on the outer circumferential surface of e ₁ .
An annular flange 1a that engages with a stepped portion between the large diameter hole 8b and the large diameter hole 18a is integrally provided. An O-ring 20 fitted to the outer peripheral surface of the one end e ₁ is sandwiched between the flange 1a and the distal end surface of the fluid tube holding cylinder 11.

Next, with reference to FIGS. 1 and 2, the assembly procedure of the pipe joint of the embodiment described above will be sequentially explained. An O-ring 20 is fitted into the flexible fluid pipe 1, which is in a single unit state before assembly, from its other end _e2 until the ring 20 engages with the annular flange _1a at the one end e1. Slide it along the outer circumference of the fluid pipe 1. In this way, hold the other end _e2 of the fluid pipe 1 with the O-ring 20 preset at one end _e1 in your hand, and gradually push it into the fluid pipe holding cylinder 11 of the outer coupler 2 from its tip opening. As time progresses, the fluid tube 1 bends and deforms along the inner circumferential surface of the fluid tube holding tube 11 and the inner surface of the bottom wall 13a of the fluid tube guide groove 13, while moving inside the holding tube 11 and the guide groove 13 to the other end _e2 side. It passes through more gradually (during this time, the fluid tube fixing piece 14 is held at the position indicated by the chain line in FIG. 2 and does not interfere with the fluid tube 1). This pushing operation of the fluid pipe 1 is carried out at one end e ₁ of the pipe 1.
This continues until the annular flange 1a engages with the distal end surface of the fluid tube holding cylinder 11 via the O-ring 20 that has already been set. When the above-mentioned pushing operation is completed, the fluid pipe fixing piece 14 is then rotated to the fixed position shown by the solid line in _FIG.
The outer periphery on the other side is clamped and fixed between the bottom wall 13a of the fluid pipe guide groove 13 and the groove 14a of the fixing piece 14. Next, the crossed knobs 8a of the annular spring 8 are pressed inward to expand the annular spring 8 outward, and the tip of the locking claw 5 is expanded outward, and then the inside of the locking claw 5 is expanded. Connecting cylinder 1 of inner coupler 3 to
7 is inserted and fitted to the outer periphery of the fluid tube holding cylinder 11. After inserting the inner coupler 3 into the outer coupler 2 as described above, if the pressing force on the annular spring 8 is released and it is contracted and restored to its original shape, the locking pawl 5 of the outer coupler 2 is pressed inward and compressed. The locking piece 5a at the tip of the lever engages with the shoulder 17a on the outer periphery of the connecting cylinder 17 of the inner coupler 3, and the inner coupler 3
is prevented from being removed from the outer coupler 2, thereby completing the connection between the inner coupler 3 and the outer coupler 2, and the fluid pipe 1 is connected to the fluid passage 19 in the inner coupler 3.
will be communicated to. At this time, the tip of the one end e of the fluid pipe 1 is fitted into the small diameter hole 18b of the connecting cylinder 17, and the annular flange 1a is connected to the step between the large and small diameter holes 18a and 18b of the connecting cylinder 17 and the holding cylinder. 1
O-ring 2 is pressed between the end face of O-ring 1 and
0 is compressed in the axial direction and expanded in the radial direction to seal between the outer periphery of the fluid pipe 1 and the inner periphery of the connecting cylinder 17.

Further, when the annular spring 8 is expanded outward, the tip of the locking pawl 5 is expanded outward, and the locking piece 5 is expanded outward.
a separates from the shoulder 17a on the outer periphery of the connecting cylinder 17, and therefore the inner coupler 3 can be pulled out from the outer coupler 2 to separate them.

As described above, according to the present invention, in the pipe joint that includes an outer coupler and an inner coupler that can be fitted thereto, the outer coupler has a fluid pipe holding cylinder through which the fluid pipe can be inserted, and the inner coupler has a fluid pipe holding cylinder that can insert the fluid pipe. Connecting cylinders that can fit into the cylinders and fix the fluid pipes are provided, and the outer coupler further includes a plurality of elastic locks that surround the connecting cylinders and can be locked to shoulders on the outer periphery of the connecting cylinders. pawls are provided, and an annular spring is embedded in the free ends of these locking pawls for biasing the locking pawls in the direction of engagement with the shoulder portion, and this annular spring is expanded to cause the locking to occur. Since a knob is provided that allows the pawl to be removed from the shoulder, the annular spring is expanded, the locking pawl is expanded outward, and the connecting tube of the inner coupler is inserted into the outer coupler, and then the annular spring is returned to its original state. The inner coupler and the outer coupler can be connected extremely easily and reliably by contracting and restoring the locking pawl to lock it to the shoulder of the connecting tube. This reliably prevents the inner coupler from separating from the outer coupler during connection, significantly increasing the safety of its use.Furthermore, only relatively simple processing is required on the inner coupler and outer coupler, reducing costs. It is something that becomes.

[Brief explanation of the drawing]

The figure shows one embodiment of the device of the present invention.
The figure is an exploded perspective view showing the outer coupler and the inner coupler separated, Figure 2 is a longitudinal sectional view showing their connected state, and Figure 3 is a bottom view of the outer coupler with the fluid pipe fixing piece opened. be. DESCRIPTION OF SYMBOLS 1... Fluid pipe, 2... Outer coupler, 3... Inner coupler, 5... Locking claw, 8... Annular spring, 8a... Knob, 11... Fluid pipe holding cylinder, 17
...Connecting tube, 17a...Shoulder.

Claims (1)

[Scope of utility model registration request] In a pipe joint consisting of an outer coupler and an inner coupler that can be fitted into the outer coupler, the outer coupler has a fluid pipe holding cylinder through which the fluid pipe can be inserted, and the inner coupler has a fluid pipe holding cylinder that fits into the fluid pipe holding cylinder and holds the fluid pipe. Each has a connecting tube that can fix the
Further, the outer coupler is provided with a plurality of elastic locking claws that surround the connecting cylinder and can be locked to shoulders on the outer periphery of the connecting cylinder, and these locking claws are attached to the free ends of the locking claws. An annular spring biased in the direction of engagement with the shoulder is embedded, and the annular spring is provided with a knob that can expand the annular spring to detach the locking pawl from the shoulder. pipe fittings.