JPS5841430Y2 - pipe fitting plug - Google Patents

Description

[Detailed description of the invention] The present invention relates to a plug for a pipe joint.The plug is made of a resin material and can be molded, thereby significantly simplifying the manufacturing process and reducing manufacturing costs. , the weight of the plug is reduced to make it easier to handle.

If the socket is made of metal, the plug of a conventional pipe fitting is made of metal, and if the socket is made of synthetic resin, it is made of synthetic resin. This is because pipe fittings are required to have good sealing properties when connected, so sockets and plugs are either made of metal or synthetic resin, taking into account fitting dimensions and manufacturing tolerances. Manufactured using limited materials.

However, while metal pipe fittings are expensive to manufacture, synthetic resin pipe fittings are easily damaged by impact when dropped or the locking ball engages or disconnects when the connection is separated, and they are also prone to wear. Because it had the disadvantage of being cheap,
There was a demand for pipe fittings with less wear.

Plugs have a simpler structure than sockets, so there is an increasing trend toward molding them from synthetic resin in order to reduce manufacturing costs. The reality is that it cannot be put to practical use in pipe joints that require a very high fitting precision because it is so inferior that it cannot be compared with the manufactured ones.

The present invention is a plug for a pipe joint that has been devised for the purpose of achieving the same fitting accuracy as a pipe joint made of metal without impairing the economic efficiency of pipe joints made of resin materials.

The present invention will be explained below based on embodiments shown in the drawings.

In Fig. 1, reference numeral 1 denotes a plug whose main body is made of synthetic resin, and which has an annular groove 2 formed approximately on the outer periphery of the tip, and further has an inner circumferential surface on the surface of the annular groove 2 that has the same shape as the annular groove 2. A metal ring body 4 having a locking groove 3 for locking a locking ball 17, which will be described later, is fixed to the outer peripheral surface.

FIG. 2 shows one of the sockets 19 that are paired with the plug of the present invention.
In the example shown, 11 is a main body of a socket with a mounting portion 10 at the rear.

12 is a plug 1 formed inside the tip of the socket main body 11
A circular valve opening 20 is located at the center of the rubber valve seat 13 attached to the inner part of the connecting part 12.
, insert the valve body 15 into the valve port 20, and insert the valve body 15 inward (
The valve body 15 is biased by the compression spring 14 from the right side in Fig. 2).
is brought into pressure contact with the valve seat portion 13.

An appropriate number of tapered holes 16, 16 are provided on the outer periphery of the connecting portion 12 near the opening tip.
6, metal locking balls 17.degree. 17... having a diameter longer than the wall thickness of the corresponding portion of the socket main body 11 are individually fitted so as to be retractable in the centrifugal direction.

Further, a sleeve 18 for pressing the locking balls 17, 17, .

Next, the mode of connecting the plug 1 and the socket 19 of the present invention and the function of the plug 1 will be explained.

To connect the plug 1 and the socket 19, first, the sleeve 18 is moved back against the compression spring 21, and the locking balls 17, 17, etc. fitted in the tapered hole 16 are released. Allows movement in the radial direction within a certain range.

In this state, when the tip of the plug 1 is inserted into the connection part 12 of the socket 19, the valve body 15 protruding into the connection part 12 retreats against the elastic force of the compression spring 14, and reaches the most retreated position. At times, the tip of the plug 1 comes into close contact with the inner surface of the valve port 20 to form a seal.

In this sealed state, the locking groove 3 of the plug 1 aligns with the locking ball 17 of the socket 19 on the same line.

Therefore, at this time, if you release your hand from the sleeve 18, the sleeve 18 moves forward due to the elastic force of the compression spring 21, and the locking balls 17, 17 are moved forward by the inner peripheral surface of the sleeve 18.
... is pushed toward the center and engaged with the locking groove 3 of the plug 1, and the socket 19 and the plug 1 are connected.

In this case, even if the main body of the plug is made of synthetic resin, the locking groove 3
Since the ring body 4 having the ring body 4 is made of metal, the metal locking ball 1
7 is engaged as described above, the locking groove 3 is not damaged by the locking ball 17.

Next, when separating the socket 19 and the plug 1, the sleeve 18 can be moved backward against the elastic force of the compression spring 21, and the locking ball 17°17 is released again and the plug 1 is pushed out of the socket 19 by the elastic force of the compression spring 14.

Although the embodiments have been described above, the present invention has a through hole formed in the axial center of the socket body, and a locking ball is fitted near the open end of the hole in the socket body. A taper hole is formed through the hole in the centrifugal direction, and a locking ball is fitted into the taper hole so as to be able to move in and out of the through hole, and the locking ball is attached to the outer circumference of the socket body. A socket of a type that is restrained or released by the operation of a sleeve fitted so as to be slidable in the direction, and a through hole formed in the axial center of the plug main body in the axial direction, and an opening hole of the plug main body. It consists of a plug with an annular groove formed in the circumferential direction on the outer periphery near one end for engaging and disengaging with the locking ball, and when the socket and plug are fitted, the through hole formed in the socket and the hole formed in the plug are formed. In a pipe joint of the type in which the holes communicate with each other and a locking ball provided in the socket engages with an annular groove formed in the circumferential direction of the plug, the main body of the plug is formed of a resin material and the plug is locked. Since the surface of the annular groove that engages and disengages from the ball is covered with a metal ring that has a locking groove that engages with the locking ball, the plug of the invention has a low weight because its main body is made of resin material. It is extremely light, and it is possible to reduce the weight of various fluid pressure driven tools equipped with this plug.

In addition, even if the main body is made of a resin material such as urethane or rubber, the surface of the annular groove is reinforced to form a locking groove, so it should be handled with care, even if dropped on the floor. Even if this occurs, the surface of the locking groove, such as the corners, will not be damaged, and the fit will not be impaired.

Furthermore, since the locking groove that locks the locking ball of the socket is made of durable metal, the engagement between the locking ball and the locking groove of the plug will not loosen. As such, it will not come off easily even with the slightest external force, and can be used as safely as conventional all-metal plugs. Combined with the fact that the main material of the plug is made of resin, it is extremely practical. There is an effect that it can be done.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing one embodiment of the plug of the present invention, and FIG. 2 is a vertical cross-sectional view of a socket paired with the plug shown in FIG. 1. 1 is a plug, 2 is an annular groove, 3 is a locking groove, 4 is a ring body, 16
1 is a tapered hole, 17 is a locking ball, and 19 is a socket.

Claims (1)

[Scope of utility model registration request] The socket body has a through hole formed in the axial direction in the axial center, and a tapered hole for fitting the locking ball is passed through in the centrifugal direction near one end of the socket body. operation of the sleeve, in which a locking ball is fitted into the tapered hole so that it can freely move in and out of the through hole, and the locking ball is fitted to the outer circumference of the socket body so as to be slidable in the axial direction; It has a socket of the type that can be locked or released by the plug body, and a through hole formed in the axial direction in the axial center of the plug body, and a hole on the outer periphery of the plug body near one end of the hole that engages and disengages with the locking ball. When the socket and plug are fitted, the through hole formed in the socket and the through hole shaped in the plug communicate with each other, and the plug has an annular groove formed in the circumferential direction. In a pipe joint of the type in which a provided locking ball engages with an annular groove formed in the circumferential direction of the plug, the main body of the plug is made of a resin material, and the surface of the annular groove that engages and disengages with the locking ball is made of a resin material. A pipe fitting plug covered with a metal ring with a locking groove that engages with a locking ball.