JPH0979464A - Hose connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items and to improve the workability when a hose connector is assembled to a hose. SOLUTION: An inner tube 4 which can be inserted almost closely to a hose 3; and an outer tube which is concentric to the inner tube 4 and has the diameter a little larger than the outer diameter of the hose 3; are formed integrally, and an elastic locking piece having a projection 6a projecting to the outer side in the radius direction from the outer peripheral surface is provided to the outer tube so as to compose a connector main body 1, and an O-ring 10 to maintain the hose 3 liquidtight to the inner circumferential surface of the outer tube is provided by an insert forming. A cylindrical lock member 2 fitted to the outer tube allowable to displace relatively is formed, and an opening 9 to receive the projection 6a is provided to the lock member 2. While the connector main body 1 and the lock member 2 are made in an assembly in the condition to face the projection 6a to the opening 9, the hose 3 is inserted to the inner tube 4, and then, the lock member 2 is rotated to bite the elastic locking piece into the hose 3, so as to prevent the removal of the hose 3. Since no O-ring holding member is requested, the number of part items is reduced, and the assembling work can be carried out easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose connector used when piping a hose.

[0002]

2. Description of the Related Art Conventionally, in a hose connector used for piping a hose, the pipe part of the connector is inserted into the hose and elastically tightened by an α-shaped metal band fitted to the outer peripheral surface of the hose. There are things that I tried to connect. In the case of the above structure, the band is pinched at the time of mounting to temporarily expand the band and move it to the lower part of the neck of the pipe part of the connector to mount it, but it is necessary to secure sufficient liquid tightness in the used state. It was necessary to make the elastic tightening force of the metal band extremely strong at the site, and in that case it was extremely difficult to work with only the hands, and a jig was required, which made the work complicated.

[0003]

When it is necessary to ensure liquid-tightness like a connector for a fuel hose of an automobile, an O-ring as disclosed in, for example, Japanese Patent Laid-Open No. 5-203088 is used. The hose connector used should be used. However, in the structure described above, in order to mount the O-ring, a spacer that also serves as a retainer for the O-ring is mounted in advance in the tubular housing of the connector. Therefore, it is necessary not only to prepare the O-ring and the spacer as separate parts, but also to prevent the O-ring from coming off from the connector before assembling the hose, which causes a problem that the manufacturing of the connector becomes complicated. It was

[0004]

In order to solve the above problems and reduce the number of parts and improve the workability when assembling to a hose, the present invention provides:
The hose includes an inner cylinder part that can be inserted into the hose approximately tightly, and an outer cylinder part that is coaxial with the inner cylinder part and that is integrally formed with the hose having a slightly larger diameter than the outer diameter of the hose. A connector main body provided with an elastic locking piece having a protrusion projecting outward in the radial direction from the outer peripheral surface, and a cylindrical body that is fitted to the outer cylinder portion so as to be relatively displaceable, and receives the protrusion. And an O-ring for holding the hose in a liquid-tight manner is insert-molded on the inner peripheral surface of the outer tubular portion.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail based on specific examples shown in the accompanying drawings.

FIG. 1 is an exploded perspective view showing a hose connector to which the present invention is applied. The hose connector is used, for example, in a connection portion of a fuel hose of an automobile, and includes a connector body 1 and a lock member 2 each made of synthetic resin as shown in the figure.

The connector body 1 coaxially surrounds the inner tubular portion 4 and the pipe-shaped inner tubular portion 4 to be inserted into the hose 3, as shown in FIGS. 2a and 2b showing the assembling procedure. As described above, the outer cylinder portion 5 has a bottomed cylindrical shape and is integrally molded. The outer diameter of the inner cylinder portion 4 is slightly larger than the inner diameter of the hose 3, and the inner diameter of the outer cylinder portion 5 is slightly larger than the outer diameter of the hose 3. The connector body 1 is provided with a connection pipe portion 1a for connecting to a connection partner (not shown) of the hose 3 so as to communicate with the inner tubular portion 4 and project outward from the bottom wall of the outer tubular portion 5. Has been.

The outer peripheral surface of the outer cylindrical portion 5 of the connector body 1 is formed such that its bottom wall side has a large diameter and its opening end side has a slightly smaller diameter, and its small diameter portion extends in the axial direction. An elastic locking piece 6 having a shape cut out so as to be cantilevered in the state of being provided is provided. A trapezoidal projection 6 a is formed at the extended free end of the elastic locking piece 6 so as to project radially outward from the outer peripheral surface of the outer tubular portion 5. A pair of elastic stop pieces 6 are provided point-symmetrically with respect to the axial center of the outer cylinder portion 5.

A trapezoidal projection 7 is formed on the large-diameter portion of the outer cylinder portion 5, and a pair of these projections 7 are also provided point-symmetrically with respect to the axis of the outer cylinder portion 5. At the bottom wall side end of the outer peripheral surface of the outer tubular portion 5, four wing-shaped pieces 1b extending outward in the radial direction are arranged at equal pitches in the circumferential direction for gripping during work. ing.

The lock member 2 is formed in a cylindrical shape, and an inner peripheral surface thereof has a diameter-increased portion corresponding to a large-diameter portion of the outer cylinder portion 5 and a diameter-reduced portion corresponding to a small-diameter portion of the outer cylinder portion 5. Has been formed.
The enlarged diameter portion is provided with a lock hole 8 having a flat concave shape so that the protrusion 7 can be received at the time of assembly and the relative displacement in the circumferential direction is possible. Also, in the reduced diameter part,
An opening 9 capable of receiving the protrusion 6a at the time of assembly is provided, and a pair of the lock hole 8 and the opening 9 are also provided point-symmetrically with respect to the axial center of the lock member 2. In addition,
At the rear end portion of the outer peripheral surface of the lock member 2 when assembled, four blade-shaped pieces 2a extending outward in the radial direction are arranged at equal pitches in the circumferential direction for gripping during work. .

On the inner peripheral surface of the outer tubular portion 5, an O-ring 10 is provided at a position between the elastic engagement piece 6 and the bottom wall, as shown in FIG. 2b. This O-ring 10
Are simultaneously formed by insert molding when the connector body 1 is resin-molded, but a half-moon shape or more with a circular cross section is insert-molded into the outer cylindrical portion 5 in a buried state.
Therefore, the O-ring 10 does not fall off during handling after molding.

Next, an assembling procedure of the hose connector thus constructed will be described below with reference to FIGS. 2 and 3. The lock member 2 is previously attached to the outer cylinder portion 5 of the connector body 1.
Fit and keep it in the assembled state. In this assembled state, as shown in FIG.
It is assembled so that the projection 6a is received therein. The lock hole 8 is divided into two in the circumferential direction by a projecting stopper 8a located at the center in the circumferential direction. In the assembled state, the projection 7 is received in one of the sections. .

With respect to the hose connector in the assembled state, the hose 3 is inserted into the inner cylindrical portion 4 of the connector body 1 to some extent to be in the state shown in FIG. In this state, since the hose 3 is expanded in diameter and connected to the inner cylinder portion 4, the hose 3 is coupled to the inner cylinder portion 4 by the elastic restoring force of the hose 3 so as to be fastened to the inner cylinder portion 4, and a certain amount of retaining force is prevented. Occurs. In this state, the O-ring 10 is pressed against the outer peripheral surface of the hose 3, so that the liquid-tightness of the connection portion of the hose 3 with respect to the inner tubular portion 4 is secured.

Then, the lock member 2 is once pushed against the connector body 1 in the axial direction shown by the arrow A in FIG. 2A so that the projection 8 can avoid the stopper 8a. After rotating it in the B direction) to position the protrusion 7 on the other partition portion of the lock hole 8, the lock member 2 is pulled back in the axial direction (the direction opposite to the arrow A) (FIG. 3). By rotating the lock member 2 in the circumferential direction, the projection 6a of the elastic engagement piece 6 is disengaged from the opening 9 and is pushed inward in the radial direction by the inner peripheral surface of the lock member 2.
As shown in FIG. 3, the corners of the extended ends of the elastic engaging pieces 6 bite into the outer peripheral surface of the hose 3, and a part of the peripheral wall of the hose 3 is sandwiched between the inner cylindrical portion 4 and the elastic engaging pieces 6. The hose 3 is firmly retained.

It should be noted that the projection 6a is locked so that when the locking member 2 is turned during locking, the projection 6a easily enters the lower side of the inner peripheral surface of the locking member 2 from the state exposed in the opening 9 shown in FIG. 2a. A slope portion is formed on the side facing the direction in which the member 2 is rotated (the direction of arrow B). Further, in order to facilitate the temporary assembly work of pushing the lock member 2 in the axial direction, the protrusions 6a and the projections 7 are also formed with inclined surfaces on the sides facing each other in the pushing direction of the lock member 2.

Further, since the projection 7 collides with the stopper 8a against the circumferential displacement of the lock member 2, the lock member 2 is prevented from rotating, and the lock member 2 is vibrated.
There is no possibility that the protrusion 6a comes into contact with the inside of the opening 9 by turning around.

In this embodiment, an example of using it for a connecting portion of a fuel hose of an automobile is shown, but the hose connector of the present invention is not limited to this, and can be used for a general connector for connecting a liquid hose. Applicable.

[0018]

As described above, according to the present invention, the hose is inserted into the inner cylindrical portion of the connector main body, and the O is formed on the outer peripheral surface side of the hose.
In a hose connector having a structure for ensuring liquid tightness by providing a ring, since an O-ring is provided on the hose connector by insert molding in advance, a separate component such as an O-ring holding member prepared when the O-ring is used as a separate component It is not necessary, and the number of parts can be reduced, and by turning the lock member, the elastic locking piece can be pushed into the hose side and bite into the hose to prevent it from coming off, and no jig or the like is required during assembly, Workability can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a hose connector to which the present invention is applied.

2A is a top view showing a state where a hose is inserted into a hose connector, and FIG. 2B is an arrow II of FIG.
The sectional side view seen about the b-IIb line.

FIG. 3A is a top view of a hose connector in which a lock member is turned to keep a hose from coming off; FIG.
Is a side cross-sectional view taken along the line IIIb-IIIb in FIG.

[Explanation of symbols]

 1 Connector body 1a Pipe part 1b Wing piece 2 Lock member 2a Wing piece 3 Hose 4 Inner tube part 5 Outer tube part 6 Elastic locking piece 6a Projection 7 Protrusion 8 Lock hole 9 Opening 10 O-ring

Claims (1)

[Claims] 1. An inner cylinder part that can be inserted into a hose substantially tightly, and an outer cylinder part that is coaxial with the inner cylinder part and is integrally formed with the hose having a diameter slightly larger than the outer diameter of the hose. A connector main body provided with an elastic locking piece having a projecting portion projecting outward in the radial direction from the outer peripheral surface of the outer tubular portion, and a cylindrical shape for externally fitting to the outer tubular portion so as to be relatively displaceable, and A hose connector comprising a lock member having an opening for receiving the protrusion, and an O-ring for holding the hose in a liquid-tight manner is insert-molded on an inner peripheral surface of the outer cylinder part.