JP2540563Y2 - Fitting for connecting small diameter resin tube - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to connecting a resin tube having a relatively small diameter of about 20 m / m or less, which is generally provided as an oil supply / air supply path to an automobile or various machines and devices. The present invention relates to improvement of a joint structure.

[0002]

2. Description of the Related Art Conventionally, as a connecting joint of this type, for example, as shown in FIGS.
At the stepped portion formed by the enlarged diameter chamber (13) of the tubular joint body (11) having an elastic seal ring (14) inside, connecting the peripheral edge of the center hole to the claw wall (15a) ) Disc-shaped gripping member (15)
In the engaged state, the stopper (16) is clamped by caulking at the rear end peripheral edge (11 ') of the joint body (11). Incidentally, (17) is a release of a separate body which is engaged with the periphery of the shaft hole of the stopper (16) and moves before and after releasing the biting of the resin tube (P ') by the claw wall (15a). Tool.

However, in such a conventional technique, when the resin tube (P ') is inserted and connected, the claw wall (15a) is fixed by the fixing structure of the gripping member (15) held by caulking. Since the rigidity is high, the resin tube does not bend.Therefore, the outer circumferential surface of the resin tube is scratched in the tube axis direction by the claw wall (15a).
Because of the structure in which the seal ring (14) is installed on the more distal side,
There is a problem that gripping on the nail wall (15a) and, particularly, sealing performance of the seal ring are deteriorated, and leakage often occurs for a long period of time.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has a problem in that the outer wall surface of the resin tube by the claw wall of the gripping member at the time of mounting and dismounting, particularly in the axial direction of the tube. Eliminates the fear of abrasion, prevents gripping on the nail wall and prevents the sealing member from deteriorating, and increases rigidity in the pull-out direction to prevent detachment of the resin tube from the joint body. It is an object of the present invention to propose a joint for connecting a small-diameter resin tube capable of reducing the product cost by eliminating the need for a stopper such as described above, a crimping operation thereof, and a separate releasing tool that directly contacts the claw wall. Things.

[0005]

According to the present invention, in order to achieve the above object, a small-diameter chamber and a large-diameter chamber having an enlarged diameter connected to a flow hole of a connecting cylinder wall on the distal end side are provided inside a shaft core. And an annular elastic seal member between the inner peripheral surface and the outer peripheral surface of the resin tube connected to the inside of the joint body forming the rear end peripheral wall portion of the large diameter chamber as a support wall; A connecting joint having a gripping member having a claw wall which bites into an outer peripheral surface of the resin tube and is engaged with the hanging wall portion on the joint body side. A plurality of tongue-shaped claw walls that bite the member into a resin tube protruding inward at the tip end of the shaft center, an annular wall smaller in diameter than the small-diameter chamber behind the claw wall, and an outer wall further rearward. And an arm which can be engaged with a wall portion between the small diameter chamber and the large diameter chamber of the joint main body, and further has a cylindrical wall protruding outside. The gripping member is provided with a slit in the axial direction in a part of the peripheral wall thereof by a metal spring plate material, or a base formed by a claw wall portion. A reduced diameter wall is provided in the vicinity, and a metal claw piece is formed by casting a metal claw piece at a tip portion forming a claw wall with a resin material, or a pressing wall protruding outward at a rear end of the gripping member. Or a tapered portion that opens rearward between the small diameter chamber and the large diameter chamber.

[0006]

According to the present invention, a plurality of tongue-shaped claw walls projecting inward from the tip end of the shaft center and a plurality of tongue-shaped claw walls protrude outward behind the claw walls. The end has an arm that engages with the small diameter chamber and the wall of the large diameter chamber of the joint main body, and a structure having a cylindrical wall protruding to the outside. Inserting the resin tube together with the gripping member, or pressing only the gripping member after inserting the resin tube and moving forward, abuts the wall near the base of the arm to open the claw wall of the gripping member. Therefore, it is possible to substantially eliminate the fear that the nail wall on the outer peripheral surface of the resin tube may cause abrasion in the tube axis direction at the time of mounting and detaching, and to prevent the grip on the nail wall and the deterioration of the sealing property with the sealing member. Stopper used in the conventional example Caulking work well without a Tsumekabe and liberating tool of separate abutting unnecessary may form product cost and inexpensive.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a connection state of a joint for connecting a small-diameter resin tube according to the present invention, and FIG. 3, FIG. 3 is a state diagram accompanying the insertion at the time of connection of FIG. 1, FIG. 4 is a diagram corresponding to FIG. 1 of another embodiment, FIG. 5a is a front view of the gripping member alone of FIG. 4, and FIG. FIG. 6 is an exploded view of the gripping member of FIG.
7 is a partially enlarged sectional view of another embodiment of the gripping member, FIG. 8 is an enlarged front view of FIG. 7, (1) is a joint body,
A small-diameter chamber (2 ') and a large-diameter chamber (2 "), which are connected to the flow hole (2) of the connecting cylinder wall (3) on the distal end side, are connected inside the shaft core.
A wall portion, preferably a tapered portion (2 "') opened rearward, is formed between the large diameter chamber (2') and the large diameter chamber (2"), and the rear peripheral wall of the large diameter chamber projects inward. It is formed as a hanging support wall (1 ′). An annular elastic seal member (5) made of rubber or the like is provided in the inner groove (4) between the inner peripheral surface of the groove and the outer peripheral surface of the resin tube (P) connected thereto. (6) is a gripping member, which is a resin tube protruding inward at the tip end of the axis.
(P) A plurality of tongue-shaped nail walls (6a) biting into the nail wall (6a)
An annular wall (6d) is projected further outward and a rear end of the annular wall (6d) is hung on the support wall (1 '), and is large with the small-diameter chamber (2') on the joint body (1) side. An arm (6b) engageable with the tapered portion (2 "') between the diameter chambers (2"), and a cylindrical wall (6c) further protruding outside.
And the annular wall (6d) is formed to have a smaller diameter than the small diameter chamber (2 '), and preferably has a pressing wall portion projecting outward at its rear end.
(8). Then, when inserting the resin tube (P) at the time of connection, the resin tube (P) is pressed together with the resin tube (P) or after the resin tube is inserted, by the cylindrical wall (6c) of the gripping member (6), preferably by the pressing wall portion (8), As the arm moves forward, it comes into contact with the tapered portion (2 ″ ′) near the base of the arm (6b) to open the claw wall (6a).

As shown in FIGS. 4 and 5, a gripping member is provided.
(6) can also be easily formed by pressing a flat plate-shaped spring material and then curling it.In this case, since the slit (7) is provided on the peripheral wall of the gripping member (6) by the curling, The attachment / detachment of the holding member (6) to / from the main body (1) is further facilitated. Furthermore, a spacer is provided at the tip of the gripping member (6).
If (9) is provided to press the elastic seal member (5), the labor of machining the groove (4) in the small diameter chamber (2 ') can be saved, and the inner circumference of the connection end of the resin tube (P) can be saved. Insert (1
0) may be configured to be inserted.

A reduced diameter wall (6e) is provided near the base of the nail wall (6a).
(FIGS. 6 to 8) are provided to apply a thrust force in the tube axis direction to the gripping member (6) by the frictional force with the outer peripheral surface of the resin tube when the resin tube (P) is inserted, or as shown in FIG. As described above, the gripping member (6) is provided with a nail wall (6a) formed by casting a metal nail piece at the front end by injection molding with a resin material, and preferably a pressing wall (8) is provided at the rear end. .

In the present invention, when the pressing wall (8) is pressed in the tube axis direction, as shown in FIG. 8, a resin tube at the tip of the claw wall (6a) is formed.
Biting of the outer surface of (P) is released and the resin tube (P)
Can be easily pulled out.

[0011]

As described above, in the joint for connecting a small diameter resin tube according to the present invention, the gripping member (6) is preferably provided with the plurality of tongue-shaped claw walls (6a) and the claw wall rearward. Arm (6) protruding toward the wall and engageable with the wall between the small diameter chamber and the large diameter chamber.
b) and a cylindrical wall (6c) protruding to the outside, so that the base of the arm (6b) accompanying the forward movement of the gripping member (6) when the resin tube (P) is inserted. The close contact with the wall portion opens the claw wall (6a), so that there is no fear that the claw wall on the outer peripheral surface of the resin tube (P) causes abrasion, particularly in the tube axis direction. It is possible to prevent the gripping on the claw wall (6a) and the sealing performance of the sealing member (5) from being reduced, and the resin tube (P) from the joint body (1) because of its high rigidity in the pull-out direction. ) Can be effectively prevented, and the cost of the product can be reduced by eliminating the need for a stopper and a caulking work as in the conventional example and a separate release tool that directly contacts the claw wall. An extremely useful joint for connecting small-diameter resin tubes.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a connection state of a joint for connecting a small-diameter resin tube.

FIG. 2 is a front view of a single gripping member of FIG. 1;

FIG. 3 is a state diagram accompanying insertion during connection in FIG. 1;

FIG. 4 is a diagram corresponding to FIG. 1 of another embodiment.

FIG. 5A is a front view of the single gripping member of FIG. 4;

FIG. 5b is an exploded view of the gripping member of FIG. 5a.

FIG. 6 is an enlarged sectional view of another embodiment of the gripping member.

FIG. 7 is a partially enlarged sectional view of still another gripping member.

FIG. 8 is an enlarged front view of FIG. 7;

FIG. 9a is a longitudinal sectional view of a connection state of a conventional connection joint.

9b is a partial front view of the nail wall used in FIG. 9a.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 2 'Small-diameter chamber 2 "Large-diameter chamber 2"' Taper part 6 Gripping member 6a Claw wall 6b Arm 6c Cylindrical wall 6d Annular wall 6e Reduced diameter wall 7 Slit 8 Pressing wall part P Resin tube

Claims (6)

(57) [Scope of request for utility model registration] 1. A large-diameter chamber and a small-diameter chamber connected to a flow hole of a connecting cylinder wall on the front end side are connected to each other inside a shaft core, and a rear end peripheral wall portion of the large-diameter chamber is hung. An annular elastic seal member between the inner peripheral surface and the outer peripheral surface of the resin tube to be connected to the inside of the joint body to be formed, and bite into the outer peripheral surface of the resin tube located in the small diameter chamber at the rear thereof. In a connection joint in which a gripping member having a claw wall is internally provided, and the gripping member is engaged with the hanging wall portion of the joint body, the gripping member (6) is provided with a shaft core distal end. A plurality of tongue-shaped claw walls (6a) that bite into the resin tube (P) protruding toward the rear, an annular wall (6d) smaller in diameter than the small-diameter chamber behind the claw wall, and further outwardly outward. And an arm (6b) protruding from the joint body (1) and engageable with a wall portion between the small diameter chamber (2 ') and the large diameter chamber (2 "), and a cylindrical wall further protruding outside.
(6c). A joint for connecting a small-diameter resin tube, comprising: 2. The gripping member according to claim 1, wherein:
(6) A joint for connecting a small-diameter resin tube, wherein a slit (7) in the axial direction is provided in a part of the peripheral wall by a metal spring plate material. 3. The gripping member according to claim 1, wherein:
(6) A joint for connecting a small-diameter resin tube, wherein a reduced-diameter wall (6e) is provided near a base formed by a claw wall (6a). 4. The gripping member according to claim 1, wherein:
(6) A joint for connecting a small-diameter resin tube, wherein a metal nail piece is formed by casting a metal nail piece on a tip part of the nail wall (6a) made of a resin material. 5. The joint according to claim 1, further comprising a pressing wall portion (8) protruding outward at a rear end of the gripping member (6). 6. The small-diameter resin tube according to claim 1, wherein a tapered portion (2 ″ ′) that opens rearward is provided between the small-diameter chamber (2 ′) and the large-diameter chamber (2 ″). Fitting for connection.