JPH08254294A - Piping connecting structure - Google Patents

Abstract

PURPOSE: To improve connecting workability, prevent piping from getting off even if shock is applied from an outside, and maintain function for a long time by vibration absorption. CONSTITUTION: This device consists of an engaging projection 1B arranged on an inner cylinder 1, an arm 4 arranged on the outer circumference of an outer cylinder 3, a teeth 5 formed on the top end of the arm 4 and be engaged with the projection 1B in a pipe connecting condition, a cover 6 arranged on the outer circumference of the outer cylinder 3 and be provided with an opening port 6A for projecting the arm 4, and an operating member 7 which is slidably arranged on the outer circumference of the arm 4 and the cover 6 and on which an engaging step part 7b is formed on the inner circumference, and each work of piping connection and connection release are carried out by sliding the operating member 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a pipe connecting structure for fitting and connecting an outer cylinder and an inner cylinder. More specifically, it relates to an engaging projection provided on one pipe and another pipe. The present invention relates to a pipe connection structure that allows easy connection and disconnection by engaging claws of an arm provided.

[0002]

2. Description of the Related Art As a pipe connection structure for fitting and connecting an outer cylinder and an inner cylinder, the one conventionally filed as Japanese Utility Model Application No. 63-76116 has been disclosed.

This structure will be described with reference to FIG. 3. An outer cylinder 51, an inner cylinder 52 having a flange portion 52A for preventing slipping out at the end of the tube, and an outer cylinder 51 capable of projecting and retracting inside the tube. And a ball 53 that is fitted to the outer circumference of the outer cylinder 51 so as to be slidable in the pipe length direction.
Sliding sleeve 55 having a concave portion 54 capable of accommodating
And a biasing spring 56 which is interposed between the sliding sleeve 55 and the outer cylinder 51 and pushes the sliding sleeve 55 in a direction of separating from the outer cylinder 51.

According to this structure, the pipe connection is made as follows. Push the sliding sleeve 55 by hand and press the spring 56.
While being pulled in the direction of arrow A against the force of, the inner cylinder 52 is held by hand and fitted into the outer cylinder 51. At this time,
The recess 54 of the sliding sleeve 55 is located at a position facing the ball 53, the ball 53 is pushed into the recess 54 by the inner cylinder 52, and the inner cylinder 52 is allowed to enter.

After the inner cylinder 52 is completely fitted to the outer cylinder 51,
When the sliding sleeve 55 is released, the urging spring 56
Then, the sliding sleeve 55 is pushed back by the force of (1) to the state shown in the figure. At this time, the sliding sleeve 55 moves the ball 53 into the outer cylinder 5.
It is pushed into the inside of 1, and is locked (prevention of locking) by the ball 53 and the flange portion 52A of the inner cylinder 52.

It is also known to connect the pipes to each other by engaging an engaging projection provided on one pipe with a claw of a lock member provided on the other pipe. (Actual fairness 3-15908
(See issue)

[0007]

However, the structure shown in FIG. 3 has the following problems. Piping 5
When connecting 1, 52, the inner sleeve 52 is inserted into the outer sleeve 51 while pulling the sliding sleeve 55 by hand against the force of the biasing spring 56 in the direction of arrow A when connecting the sliding sleeves 1, 52. It was necessary to remove the hand from 55. That is, two operations, the operation of the sliding sleeve 55 and the operation of inserting the inner cylinder 52, are required, and the workability at the time of pipe connection is poor.

Further, the ball 53 is moved to the outer cylinder 51 by pushing the sliding sleeve 55 by the biasing spring 56.
, And the connection between both pipes 51 and 52 is locked. Therefore, if some sort of impact is applied from the outside and the sliding sleeve 55 slides in the direction of arrow A against the force of the biasing spring 56, the ball 53 may enter the recess 54 and the inner cylinder 52 may come off.

According to the connection structure disclosed in Japanese Utility Model Publication No. 3-15908, a special jig is required for disconnecting the connection.

An object of the present invention is to provide a pipe connection structure in which the pipe connection and disconnection operations are simple and the connection workability is improved.

Another object of the present invention is to provide a pipe connection structure in which there is no risk of the pipe coming off even if an impact is applied from the outside, and the function is retained for a long time by absorbing vibration.

[0012]

In order to achieve this object, in the present invention, an engaging protrusion provided on the inner cylinder, an arm provided on the outer periphery of the outer cylinder, and a tip of the arm are formed. A claw that engages with the engagement protrusion in a pipe connection state, a cover provided on the outer circumference of the outer cylinder and having an opening for the arm to project, and a slidably provided on the outer circumference of the arm and the cover, An operating member having an engagement step portion formed on the inner periphery thereof, and the pipe is connected and disconnected by sliding the operating member.

In another aspect of the present invention, the end portion of the outer cylinder is expanded in a trumpet shape, and an O-ring made of an elastic member is provided between the engaging protrusion of the inner cylinder and the end portion of the outer cylinder. It is characterized by.

Another aspect of the present invention is characterized in that a ring holding groove is formed in the inner cylinder, and an O ring made of an elastic member is provided in the ring holding groove.

In still another aspect of the present invention, the thickness (h) of the arm is larger than the difference (H4-H3) between the inner diameter H4 of the cover and the outer diameter H3 of the engaging protrusion. To do.

Still another aspect of the present invention is characterized in that the tip of the cover is folded up and expanded in diameter so that the outer diameter H1 of the tip is larger than the outer diameter H2 of the operating member.

Still another aspect of the present invention is characterized in that a stopper member for preventing the operation member from coming off is provided at the base end of the cover.

[0017]

Therefore, according to the present invention, the pipes can be connected and disconnected by sliding the operating member.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

A ring holding groove 1A and an engaging projection 1B are provided on the outer circumference of the inner cylinder 1, and an O-ring 2 made of an elastic member such as rubber is provided in the ring holding groove 1A. Although the engagement protrusion 1B is configured as a bead in this embodiment, the engagement protrusion 1B is not limited to this embodiment and may have a structure in which a ring is fitted and fixed, for example. On the other hand, a plurality of arms 4 are provided on the outer circumference of the outer cylinder 3 in the circumferential direction. The arm 4 is provided so as to extend while being inclined toward the tube end direction, and a claw 5 is formed at the tip of the arm 4 by being bent inward. The arm 4 is elastically deformable in the radial direction, and a cover 6 is provided on the outer periphery of the arm 4. The cover 6 is provided with an opening 6A, and in a normal state, the inclined portion of the arm 4 and the claw 5 are provided.
A bent portion for forming is arranged so as to project outward from the opening 6A. A tubular operation member 7 is fitted on the outer periphery of the cover 6, and by sliding the operation member 7, the claw 5 of the arm 4 engages with the engagement protrusion 1B (see the lower half of FIG. 1). ), Or disengage (upper half of FIG. 1). A knurl 7A is engraved on the outer periphery of the operation member 7 to prevent slipping when the finger is pinched and operated. Further, an engagement step portion 7B with which the base portion of the claw 5 of the arm 4 engages is formed on the inner periphery of the operation member 7. A stopper member 8 is provided on the outer circumference of the outer cylinder 3 in order to slide the operating member 7 within a predetermined range. The stopper member 8
Is not always necessary, and can be omitted as appropriate.
At the tip of the cover 6, there is a diameter-expanded portion 6B that is folded up in a direction that radially expands, and its radial height H
1 is higher than the radial height H2 of the operating member 7. Therefore, even if an obstacle is touched, the tip of the cover 6 hits the obstacle, so that the operation member 7 is less likely to be operated by the obstacle. The enlarged diameter portion 6B serves as a stopper for the operating member 7. Further, the difference (H4−H3) between the radial height H3 of the engagement protrusion 1B and the inner diameter H4 of the cover 6 is smaller than the thickness h of the arm 4, so that even if the inner cylinder 1 is forcibly pulled out. The claw 5 is provided between the engagement protrusion 1B and the cover 6.
The inner cylinder 1 will not be forcibly pulled out due to being pinched. The end portion 3A of the outer tube 3 is folded up in a direction that radially expands like a trumpet, and an O-ring 9 made of an elastic member such as rubber is provided between the engagement protrusion 1B and the end portion 3A. There is. The O-ring 9 performs a sealing action and at the same time prevents the inner cylinder 1 and the outer cylinder 3 from rattling with each other.

According to the pipe connection structure configured as described above, the pipe connection operation and the pipe connection disconnection operation are performed as described below, and the accidental disconnection is prevented.

First, when the inner cylinder 1 is connected to the outer cylinder 3, the inner cylinder 1 is press-fitted into the outer cylinder 3 and pushed to a position where the end portion 3A of the inner cylinder 3 comes into contact with the O-ring 9. (Refer to the state of the upper half of FIG. 1) Then, the operating member 7 is slid to hook the claw 5 of the arm 4 on the engaging protrusion 1B, and at the same time, the bent portion at the base of the claw 5 is engaged with the operating member 7. Engage with the step 7B. (Refer to the state of the lower half of FIG. 1) This completes the pipe connecting operation.

The connection disconnection operation of the pipe is the reverse of the connection operation procedure, and therefore its description is omitted.

Even if an obstacle hits the connecting portion of the pipe, the radius of the end portion of the cover 6 is larger than the radius of the operating member 7, so that the operating member 7 is not hit by the obstacle. Therefore, the accidental disconnection of the pipe is reduced.

In the lower half of FIG. 1, the gap between the engaging projection 1B and the cover 6 is sufficiently small even if the connection of the pipe is forcibly released (even if the inner cylinder 1 is about to come off). Therefore, the thickness (h) of the arm 4 does not obstruct and the arm 4 is not forced out.

Further, the O-rings 2 and 9 have a function of absorbing vibration in addition to the sealing action, and further, the O-ring 9 prevents rattling such that the inner cylinder 1 and the outer cylinder 3 are bent. Is.

Further, the present invention is not limited to the above-mentioned embodiment, and various modifications can be carried out.

[0027]

The pipe connecting structure of the present invention described above has the following effects. You can connect and disconnect pipes with a simple operation by sliding the operation members, and you can concentrate the necessary members only on one side of the pipe,
No special changes to the piping structure are required. When the O-ring is arranged between the engaging protrusion and the end of the outer cylinder, there is no rattling between the pipes. According to the structure in which the end of the cover is folded up in the direction of expanding the diameter and the outer diameter is larger than the outer diameter of the operating member, even if an obstacle collides with the connection part, it hits the cover, so it does not come out unexpectedly. . According to the structure in which the gap between the inner diameter of the cover and the outer diameter of the engaging projection is made smaller than the thickness of the arm, it does not come off even if the force forcibly coming out acts.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a pipe connection structure of the present invention.

FIG. 2 is an exploded perspective view of the pipe connection structure of FIG.

FIG. 3 is a vertical cross-sectional view showing a conventional pipe connection structure.

[Explanation of symbols]

 1 Inner Cylinder 1A Ring Holding Groove 1B Engagement Projection 2 O Ring 3 Outer Cylinder 3A End 4 Arm 5 Claw 6 Cover 6A Opening 6B Expanded Part 7 Operation Member 7A Knurled 7B Engagement Step 8 Stopper Member 9 O Ring

Claims (6)

[Claims] 1. A pipe connection structure for fitting and connecting an outer cylinder and an inner cylinder, wherein an engagement protrusion provided on the inner cylinder, an arm provided on an outer periphery of the outer cylinder, and a tip of the arm. A claw that is formed on the claw and that engages with the engagement protrusion in a pipe connected state, a cover that is provided on the outer circumference of the outer cylinder and that has an opening through which the arm projects, and slidable on the outer circumference of the arm and the cover And a connection member having an engagement step formed on the inner periphery thereof, and the connection and disconnection of the pipe is performed by sliding the operation member. 2. An O-ring made of an elastic member is provided between the engaging projection of the inner cylinder and the end of the outer cylinder by expanding the end of the outer cylinder into a trumpet shape. The pipe connection structure according to 1. 3. The pipe connecting structure according to claim 2, wherein a ring holding groove is formed in the inner cylinder, and an O-ring made of an elastic member is provided in the ring holding groove. 4. The thickness (h) of the arm is larger than the difference (H4-H3) between the inner diameter H4 of the cover and the outer diameter H3 of the engaging protrusion. The pipe connection structure described in 3. 5. The pipe connecting structure according to claim 1, wherein the tip of the cover is folded up to expand its diameter so that the outer diameter H1 of the tip is larger than the outer diameter H2 of the operating member. . 6. The pipe connecting structure according to claim 1, wherein a stopper member for preventing the operation member from coming off is provided at the base end of the cover.