JPH0310474Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a hose connection pipe joint mainly used for connecting resin hoses.

Many inventions and ideas have been made for pipe joints for connecting hoses, and the main structure of these pipe joints is that one opening of the plug is provided with a hose connection part, and the part adjacent to the connection part is provided with a hose connection part. A union nut is screwed onto the hose, and the inner peripheral surface of the union nut tightens the surface of the hose inserted into the hose connection portion for connection. With such pipe joints, there is a risk of damaging the surface of the hose due to the tightening force of the union nut, and if the hose to be connected has a large diameter, the union nut may naturally damage the surface of the hose. As the diameter increases, a greater force is required to tighten the union nut, making the hose connection process extremely time-consuming. Furthermore, if a large internal pressure or tensile load is applied to the hose in use, it may cause slippage.
There was a risk that the hose would come off the fitting.

In view of the above-mentioned disadvantages of conventional hose connection pipe joints, this invention allows for easy connection of hoses without damaging the hoses to be connected.
The purpose is to ensure a strong connection.

Hereinafter, one embodiment of this invention will be described in detail based on the drawings.

In the drawings, reference numeral 1 denotes a main cylindrical body, and the main cylindrical body 1 has a rear inner circumferential surface portion having a small diameter and a front inner circumferential surface portion having a larger diameter than the rear portion. Reference numeral 2 denotes a hose connection cylinder that is slidably fitted in the axial direction in contact with the small diameter inner peripheral surface 3 at the rear of the main cylinder 1, and the front outer peripheral surface of the hose connection cylinder 2 is formed into a tapered surface. A hose 5 can be inserted into this tapered surface 4 in an expanded state.

6 is a compression spring interposed between the main cylinder 1 and the hose connection cylinder 2 in order to urge the hose connection cylinder 2 forward; when the hose 5 is not connected,
As shown in FIG. 1, it is engaged with a lock ball support ring 7, which will be described later, to maintain the maximum forward position.

The lock ball support ring 7 is fitted in contact with the large-diameter inner circumferential surface portion 8 of the front portion of the main cylinder 1 so as to be slidable in the axial direction. An appropriate number of tapered holes 9 are formed in the circumferential direction of the lock ball support ring 7, and a lock ball 10 is fitted into the tapered hole 9 so as to be able to move forward and backward in the centrifugal direction, so that the lock ball 10 is positioned in the most centripetal direction. When this is done, the surface of the hose 5 inserted into the tapered surface 4 of the hose connection cylinder 2 can be pressed in the centripetal direction.

Further, a space 11 is provided around the large-diameter inner circumferential surface portion 8 of the main cylinder 1, into which the lock ball 10 can move out.
A tapered surface 12 is formed that presses 0 in the centripetal direction.

Further, an annular space 13 having a width corresponding to the wall thickness of the hose 15 into which the hose 5 is inserted into the hose connection cylinder 2 is formed between the hose connection cylinder 2 and the lock ball support ring 7.

14 is the lock ball 10 at the tapered surface 12;
The compression spring 14 is a compression spring that urges the lock ball support ring 7 in order to press the lock ball support ring 7 in the centripetal direction. When the lock ball support ring 7 is in its maximum advanced state, the tapered surface 12
The lock ball 10 is pressed most strongly in the centripetal direction.

Reference numeral 15 denotes an operation sleeve loosely fitted to the outer peripheral surface of the main cylinder 1, and the lock ball support ring 7 slides the sleeve 15 integrally in the axial direction on the inner and outer peripheral surfaces of the main cylinder 1. The lock ball support ring 7 and the sleeve 15 are connected by appropriate means.

Reference numeral 16 denotes a seal ring provided on the outer periphery of the hose connection cylinder 2, which is in close contact with the small diameter inner circumferential surface portion 3 of the main cylinder 1.

Next, the operation of the embodiment will be explained.

When the hose 5 is inserted from the front opening of the main cylinder 1 into the space 13 between the hose connection cylinder 2 and the lock ball support ring 7, the hose 5 is moved by the tapered surface 4 of the hose connection cylinder 2 on the one hand. , the inner peripheral surface is expanded outward, and on the other hand, the lock ball 10 supported by the lock ball support ring 7 comes into contact with the hose 5, and the frictional force at that time causes the lock ball support ring 7 to be pushed into the main cylinder 1. The compression spring 14 is moved to the inner part of the body against the elastic force. During this process, the lock ball 10 moves toward the larger inner diameter side along the tapered surface 12 formed on the larger diameter inner circumferential surface 8 of the main cylinder 1, so that it is released from the pressure of the tapered surface. When the hose 5 is further inserted, the hose connection cylinder 2 moves to the inner part of the main cylinder 1 against the elastic force of the compression spring 6.
After confirming that the hose 5 is fully inserted onto the tapered surface 4 of the hose connection cylinder 2, the force for inserting the hose 5 is loosened. At this time, the hose connection cylinder 2 and the lock ball support ring 7, which have moved first against the elastic forces of the compression springs 6 and 14, are moved to the main cylinder by the elastic forces of the compression springs 6 and 14. Due to the movement of the lock ball support ring 7, the lock ball 10 that had been moving moves again to the smaller inner diameter side of the tapered surface 12, so that it is pressed in the centripetal direction by the tapered surface 12. In this way, the lock ball 10 is connected to the tapered surface 12.
When pressed, the lock ball 10 projects to the inner peripheral surface of the lock ball support ring 7, catches the surface of the hose 5 inserted into the tapered surface 4 of the hose connection cylinder 2, and presses the hose 5 from the surface in the centripetal direction. When pressed in this way, the end of the hose 5 inserted into the tapered surface 4 is expanded by the tapered surface 4 as described above and is in a widening state, so the lock ball 10 touches the surface of the hose 5. The hose 5 is securely caught, and the hose 5 is held between the hose connection cylinder 2 and the lock ball 10 from the inner and outer peripheral directions, and the connection of the hose 5 is now completed.

In this state of use, when a tensile load is applied to the hose 5, this tensile force acts on the lock ball support ring 7 through the lock ball 10, and the reaction force becomes a pressing action of the lock ball 10 by the tapered surface 12, and the hose 5 is Since the pressure is applied in the centripetal direction, the clamping pressure of the hose 5 becomes stronger due to the reaction force of the lock ball 10, which increases in proportion to the tensile force. (Figure 3).

Next, when disconnecting the connected hose 5, press the sleeve 15 from the state shown in FIG. 3 to the state shown in FIG. 2. By this operation, the lock ball support ring 7 moves together with the lock ball 10 against the elastic force of the compression spring 14, and the lock ball 10 is moved into the space 11, so that the pressing force of the lock ball 10 against the hose 5 is weakened. Therefore, if the hose 5 is pulled out while holding down the sleeve 15 and preventing the lock ball support ring 7 from returning, the hose 5 can be easily removed.

This invention has been explained above based on the embodiments, but this invention has a lock ball support ring interposed on the outer circumference inside the main cylinder, and the hose connection cylinder is axially moved along with the lock ball support ring. The lock ball is slidably fitted into the lock ball support ring so that it can move forward and backward in the centrifugal direction, and the inner diameter is gradually increased toward the inner side of the hose connection cylinder. forming a tapered surface that increases the diameter of the lock ball, and forming a tapered surface that presses the lock ball in the centripetal direction on the inner circumferential surface of the main cylinder;
Further, a space is provided between the hose connection cylinder and the lock ball support ring for inserting the hose into the hose connection cylinder, and the inner peripheral surface of the hose is provided on the front outer peripheral surface of the hose connection cylinder. The hose connection cylinder and the lock ball support ring are each provided with a compression spring that biases them forward, and the lock ball support ring is provided with a compression spring that urges the hose connection cylinder and the lock ball support ring forward. Since the sleeve is fixed to push backward against the elastic force of the compression spring, when the hose is connected with this pipe joint, the surface of the hose is pressed in the centripetal direction by the lock ball. There is no risk of scratching the surface of the hose. Moreover, when a tensile load is applied to the connected hose, the lock ball presses the hose more firmly in the centripetal direction in proportion to this force, making the hose connection stronger, and making it easier for the hose to come out when pulled. The drawbacks of conventional pipe joints can be completely eliminated. Moreover, since the structure is simple, it is easy to manufacture and can be provided at low cost. In addition, according to this pipe joint, it is possible to firmly connect the hose with just one touch operation by firmly inserting the hose into the source connection cylinder, so it can be connected regardless of the diameter of the hose to be connected. Due to the tapered surface formed on the surface, the connection work can be easily and reliably performed regardless of variations in the inner diameter of the hose.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a partially longitudinal side view, FIG. 2 is a partially longitudinal side view showing a state in which the hose is inserted, and FIG. 3 is a partially longitudinal side view showing the state when the hose is completely connected. 1... Main cylinder body, 2... Hose connection cylinder body, 3...
Small diameter inner circumferential surface portion, 4...Tapered surface, 5...Hose, 6...Compression spring, 7...Lock ball support ring, 8...Large diameter inner circumferential surface portion, 10...Lock ball, 11...Space, 12... ...Tapered surface, 13...
...Space, 14...Compression spring, 15...Sleeve.

Claims (1)

[Scope of utility model registration request] A lock ball support ring is interposed on the outer periphery inside the main cylinder, and the hose connection cylinder is slidably fitted in the axial direction with the lock ball support ring, and the lock ball is centrifugally attached to the lock ball support ring. It is fitted so that it can move forward and backward in the direction, and forms a tapered surface that faces the front outer circumferential surface of the hose connection cylinder and whose inner diameter gradually increases toward the inner side, and also is formed with a tapered surface that presses the lock ball in the centripetal direction, and a space is provided between the hose connection cylinder and the lock ball support ring for inserting the hose into the hose connection cylinder. A tapered surface for expanding the inner peripheral surface of the hose is formed on the front outer peripheral surface of the cylinder, and compression springs are provided in the hose connecting cylinder and the lock ball support ring to bias them individually forward. and furthermore, a hose connection pipe joint in which a sleeve is fixed to the lock ball support ring for pushing the ring backward against the elastic force of the compression spring.