JP3362253B2 - Pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
Such as supply and discharge to high-speed cylinders.
Small and flexible to supply and discharge a small amount of gas
Connect the tube withContinuedPipe fittings suitable for use
Related. [0002] 2. Description of the Related Art Conventionally, this type of pipe joint has a joint body.
The tube is fitted to the tube fitting
The sleeve is fitted around the outer circumference of this tube.
To prevent the tube from biting into the locking claw.
Is known. [0003] SUMMARY OF THE INVENTION As described above,
In the configuration, the sleeve is fitted around the tube and
To keep the hook from slipping into the locking claw.
Improves tube pull-out strength and sealability
It can be done. However, tubes and tubes
For tube fitting in the fitting body where the leave is fitted
The cylindrical portion is thin and has poor strength. For this reason,
When a lateral force is applied from either the left or right, the tube
The joint tube may be broken at the base,
Poor mobility and tensile strength in the lateral direction. The present invention solves the above-mentioned conventional problems.
The pull-out strength of the tube
And improved sealing performance, and
And improved tensile strength in the lateral direction
To provide pipe fittings that can improve
It is intended to be. [0005] [MEANS FOR SOLVING THE PROBLEMS]
The pipe joint of the present invention has an inner tubular portion and an outer tubular portion on one side.
Having an annular shape between the inner tubular portion and the outer tubular portion.
It has a groove for inserting a sleeve and follows the inner peripheral part of the inner cylindrical part.
Tube fitting tube which is thin and has a locking claw on the outer peripheral surface
Having a tubular portion, the tubular portion for tube fitting and the inner tubular shape.
The outer peripheral side of the connecting part with the tube is the above-mentioned tube fitting tube
Gradually from the base side of the part to the inside cylindrical part side
A joint body formed on a thick arcuate surface;Above inside
The inner diameter approximately equal to the outer diameter of the cylindrical part and the inner diameter of the outer cylindrical part
Has an outer diameter approximately equal toAbove tube fitting tubeof
The outer peripheryOf the tube to be fitted toEnd ofFitted to the outer periphery
And the end is inside the sleeve insertion groove.Inserted
handThe inner cylindrical partOn the outer periphery ofMated and the above tube
Bite into the locking claw of the tube fitting tube
And a sleeve for holding the
You. According to the present invention configured as described above,
For fitting the sleeve to the outer circumference of the tube to lock the tube
It can be kept in a retaining state that bites into the nail
And the end of the sleeve from the tube fitting tube
Fits inside cylindrical part which is thick and excellent in strengthAnd, moreover,
As the base of the tube fitting tube reaches the inner tube
It is formed on an arc-shaped surface that gradually becomes thicker.So,
Tubular fitting for tube fitting even when force is applied to the tube in the lateral direction
To prevent the strain from being concentrated on the base of the
Can be [0007] DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below.
This will be described with reference to the drawings. Figures 1 and 2 show the invention
FIG. 1 shows a fitting according to one embodiment of the present invention, FIG.
Partially cutaway side view of connected state, Fig. 2 shows tube connected
It is a partially broken side view of the state before performing. 1 and 2, reference numeral 1 denotes a tube of the present invention.
A joint comprising a joint body 2 and a sleeve 3
I have. 4 is a tube. The joint body 2 is made of metal (for example,
Ni-plated) etc., with an inner cylinder on one side
A cylindrical portion 5 and an outer cylindrical portion 6;
An annular sleeve insertion groove 7 between the side cylindrical portion 6
I have. A thin-walled tube is inserted following the inner peripheral portion of the inner cylindrical portion 5.
The joint tubular portion 8 is provided integrally. For tube fitting
A continuous portion 9 between the tubular portion 8 and the inner tubular portion 5Outer side of
From the base side of the tube fitting tubular portion 8 to the inner tubular portion 5
As it reaches the side, it has an arc-shaped surface that gradually becomes thicker,
Concentration of power is prevented. Of the tube fitting tubular portion 8
A locking claw is provided on the outer peripheral surface of the
Reference numeral 10 protrudes integrally in a ring shape. This locking claw
Reference numeral 10 denotes a portion extending from the distal end to the rear of the tube fitting tubular portion 8.
The tapered guide surface 11 becomes gradually thicker as
The rear end has a locking surface 12 that is substantially perpendicular to the axis.
You. The outer peripheral surface of the tube fitting tubular portion 8 and the inner tubular portion 5
The distance between the outer peripheral surface and the extended surface is determined by the thickness of the tube 4 described later.
They are set to be almost equal. The joint body 2 is provided with a tubular portion 8 for fitting a tube.
A flow path 13 that opens to the other end following the inside is formed.
The path 13 has a stepped portion 14 at the inner periphery of the intermediate portion of the inner cylindrical portion 5.
And the diameter of the tube fitting cylindrical portion 8 is slightly smaller.
Is set to The other side of the joint body 2 is an outer cylindrical portion 6
It is formed so that the outer shape is thinner than
A screw 15 is formed. Outside inside the external thread 15
A gasket 16 is provided which can abut on the end face of the cylindrical portion 6.
The gasket 16 is made of a metal such as iron, for example.
Is coated with nitrile rubber or the like. The sleeve 3 is made of metal (for example, electroless
Ni-plated) etc., the inner diameter is the inner cylinder
The outer diameter of the tube-shaped portion 5 and the outer diameter of the tube 4
The outer diameter is approximately equal to the inner diameter of the
Is set to have a slightly smaller diameter. Sleeve 3
Added an inner tubular portion 5 and a tube fitting tubular portion 8
It is set to be slightly longer than the length.
Is a tapered portion 1 which gradually expands toward the outer end side.
7 and 18. The tube 4 is made of, for example, a conductive material.
It is made of urethane or the like and has flexibility. In the above configuration, the tube 4
The connection operation will be described. First, as shown in FIG.
The sleeve 3 is fitted on the outer periphery of the tube 4 and slightly from the end.
Move inward. At this time, the sleeve 3
It can be easily fitted to the tube 4 by the tapered portion 18.
it can. Next, as shown in FIG.
It fits around the outer circumference of the tubular part 8 for fitting. At this time,
The tube 4 is flexible, and has a tube fitting tubular portion 8.
The locking claw 10 has a tapered shape on the fitting side of the tube 4.
Has a guide surface 11 so that it can be fitted relatively easily.
Can be. Thereafter, the sleeve 3 is placed on the outer circumference of the tube 4.
And move it along the axial direction,
Fits and inserts the end of sleeve 3 for sleeve insertion
In the groove 7, the outer periphery of the inner cylindrical portion 5 is fitted and the end of the sleeve 3 is fitted.
The surface is brought into contact with the bottom surface 19 of the sleeve insertion groove 7. this
At this time, the sleeve 3 is easily pivoted by its tapered portion 17.
To fit the outer circumference of the inner cylindrical portion 5
Can be. By fitting the sleeve 3, the tube 4 is
By using the flexibility, it will bite into the locking claw 10
It can be maintained in a sealed state with a proper retaining state.
Then, the locking claw portion 10 has the shaft center inward as described above.
It has a locking surface 12 that is almost perpendicular to the direction.
The tube 4 is securely stopped by the locking surface 12 of
Can be held. The pipe joint 1 is, for example, a low-speed cylinder,
Connected between switching valves. At this time, the tube 4 is
The pipe joint 1 may be connected to the joint 1
After connecting to the pipe or the like, the pipe joint 1 may be connected later.
At the time of connection, use, etc., the tube 4
Even if force is applied to the tube 4
The end of the tube 3 has the outer periphery of the inner tubular portion 5 as described above.
Mated withAnd the base of the tube fitting tubular portion 8 is
The arc shape gradually becomes thicker as it reaches the inner cylindrical part 5 side
Form on surfaceThe base of the tube fitting tubular portion 8
To prevent the breakage by preventing the strain from being concentrated on the part.
Can be. It should be noted that connection with a desired device such as a slow-speed cylinder is required.
The connecting portion is not limited to the male screw 15 and uses a swivel nut or the like.
The flow path 13 is not limited to a straight line,
Can be opened at right angles. In addition, the present invention
Design changes without departing from the basic technical concept.
Can be changed. [0015] According to the present invention, as described above,
Claw for locking tube by fitting leave to outer circumference of tube
It can be held in a retaining state that bites into the part
And therefore the tube pull-out strength and seal
Performance can be improved. Also, attach the end of the sleeve
Inner tube thicker and stronger than tube fitting tube
Mated withAnd the base of the tube fitting tube
An arc-shaped surface that gradually becomes thicker as it reaches the inner cylindrical part side
FormedTherefore, a force is applied to the tube in the lateral direction
So that strain is not concentrated on the base of the tube fitting tube
To prevent its breakage,
Vibration and lateral tensile strength can be improved
Thus, reliability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially broken side view showing a pipe joint according to an embodiment of the present invention, with a tube connected. FIG. 2 is a partially cutaway side view showing the pipe joint before connecting a tube. [Description of Signs] 1 Pipe joint 2 Joint body 3 Sleeve 4 Tube 5 Inner tubular part 6 Outer tubular part 7 Sleeve insertion groove 8 Tube fitting tubular part 10 Locking claw

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-320093 (JP, A) JP-A-7-269761 (JP, A) JP-A-11-248075 (JP, A) JP-A-9-96 250671 (JP, A) JP-A-10-196873 (JP, A) JP-A-7-35892 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 33/22-33 / 24 F16L 21/00

Claims (1)

(57) [Claim 1] An inner cylindrical portion and an outer cylindrical portion are provided on one side, and an annular sleeve is inserted between the inner cylindrical portion and the outer cylindrical portion. A tube fitting cylindrical portion having a groove, a thin wall having an engaging claw portion on an outer peripheral surface following the inner peripheral portion of the inner cylindrical portion, the tube fitting cylindrical portion and the inner cylinder A joint body formed in an arc-shaped surface that gradually becomes thicker as an outer peripheral side in a continuous portion with the tubular portion extends from the base side of the tube fitting tubular portion to the inner tubular portion side, and the inner tube Condition
Between the inner diameter of the outer cylindrical part and the inner diameter of the outer cylindrical part.
The outer circumference of the tube fitting tubular portion having substantially the same outer diameter
With fitted on the outer periphery of an end portion of a tube fitted in part, the end portion is fitted in the outer peripheral portion of the upper <br/> Symbol inner tubular portion is inserted into the sleeve inserting groove And a sleeve for holding the tube in a retaining state so as to bite into the locking claw of the tube fitting tubular portion.