JPS589037Y2 - pipe fittings - Google Patents

Description

[Detailed description of the invention] This invention relates to a pipe joint, and is characterized by the fact that the surfaces of the locking parts of the plug and socket are made of resin or an elastic material, thereby significantly increasing the durability of the locking parts, which are often damaged. It is.

The locking means of a pipe joint is, for example, a type in which a lock ball provided on the socket side engages with a locking groove formed on the plug side. The button is housed in one hole,
The ball engages and disengages from a locking groove formed on the outer periphery of the plug near the tip, so that the socket and plug can be coupled and separated.

However, in this type of so-called lock ball locking type pipe fitting, when vibration is applied in the thrust direction while the socket and plug are connected, the lock ball may move in the width direction of the locking groove. The surface of the taper hole that accommodates the ball or the locking groove on the plug side may be worn or scratched, which may impair the durability of the pipe fitting, or the plug may be damaged during connection. This also caused accidents such as the socket separating.

The purpose of the present invention is to eliminate the drawbacks of such conventional pipe joints, prevent wear of the locking part, and increase durability. Below are some examples of the present invention based on drawings. explain.

First, the plug 1 shown in FIG. 1 will be explained.

This plug 1 is made of metal, and has a groove 2 formed in the circumferential direction substantially on the outer peripheral surface of the tip.

This circumferential groove 2 has an inverted trapezoidal cross-sectional shape similar to the known lock ball locking groove, but a ring body 3 made of an elastic material such as natural rubber or urethane rubber is provided on the surface of the groove 2. A regular locking groove 4 for engaging and disengaging the lock ball is formed on the outer peripheral surface of the ring body 3.

If the plug is formed as shown in the above embodiment, the socket connected to the plug 1 may be a normal socket with a metal lock ball whose surface is not covered with an elastic material. Alternatively, it may be a socket 23 as shown in FIG. 4, which will be described later.

If this plug 1 is used in pair with a normal socket (not shown), the lock ball 16 will fit into the locking groove 4 during connection.
The vibration applied to the plug 1 and the socket in the thrust direction is absorbed by the ring body 3 made of an elastic body, thereby preventing the lock ball from rattling.

Next, the socket 5 shown in FIG. 2 will be explained.

A rear body T having a rubber hose connection part 6 is screwed to the rear part of the socket 5.

An opening 8 for inserting a plug is provided at the tip of the socket 5, and a compression spring 11 is inserted from the rear body 7 side into a valve port 10 provided at the center of a valve seat 9 made of an elastic body attached to the inside of this opening 8. The valve body 12, which has been elastically fired, is fitted so as to be slidable in the axial direction, and the tip of the valve body 12 is projected into the opening 8.

Several tapered holes 13 having a smaller diameter on the centripetal direction side of the opening 8 are formed on the peripheral surface of the distal end side of the socket 5 having the opening 8, passing through the opening 8 in the centrifugal direction. Elastic bodies 15, 15 made of natural rubber or urethane rubber, each having a tapered hole 14, are fixed thereto.

A metal lock ball 16.16 having a diameter larger than the wall thickness of the socket in the portion where the taper hole 13 is formed is fitted into the taper holes 14, 14, and the lock ball 16, 16 is fitted around the tip of the socket 5. A sleeve 1γ for pressing the ball 16° 16 in the centripetal direction of the opening 8 is attached so as to be slidable in the axial direction.

18 is for urging the sleeve 1T to the left in FIG.
This is a spring that is activated by the sleeve 17.

If this socket 5 is used as a pair with a general metal plug 21 shown in FIG. Vibration in the thrust direction applied to the locking groove 22 and the taper hole 14 that accommodates the lock ball 16 is absorbed by the surface of the elastic taper hole 14. Therefore, the lock ball 16 is not worn or damaged, and the lock ball 16 can be prevented from shaking.

The plug paired with this socket 5 may be the plug 1 shown in FIG.

In the past, when the plug 1 shown in FIG. 1 and the socket 5 shown in FIG. Since none of the surfaces of the lock ball 16 come into direct contact with metal surfaces, the durability of the locking part including the lock ball 16 can be further improved.

Next, the socket 23 shown in FIG. 4 will be explained.

This socket 23 is made of metal, and several tapered holes 25, 25 with a small diameter on the centripetal direction side of the opening 24 are provided on the outer periphery of the opening 24 side into which the plug 21 is inserted, passing through the opening 24 in the centripetal direction. Lock balls 28, 28, which are metal balls 2G whose outer peripheries are covered with an elastic body 27 such as natural rubber or urethane rubber, are fitted into the holes 25, and the sockets 23
A sleeve 29 for pressing the lock ball 28 in the centripetal direction of the opening 24 is attached to the outer periphery of the tip so as to be slidable in the axial direction.

30 is for urging the sleeve 29 to the left in FIG.
This is a spring that is activated by the sleeve 29.

If this socket 23 is used as a pair with the metal plug shown in FIG. Since the surface of the lock ball 28 is made of an elastic body, even if vibration is applied to the plug 21 and the socket 23 in the thrust direction, the vibration is absorbed by the elastic body 2T on the outer surface of the lock ball 28. Not only the lock ball 28 but also the taper hole 25 and the locking groove 22 will not be damaged, so the locking part will not be worn out.
There will be no damage, and the lock ball 28 can be prevented from rattling.

Although several embodiments have been described above, the present invention has a fluid passage hole formed in the axial direction in the axial center of the socket body, and the socket body has a fluid passage hole near the open end of the socket body. To,
A taper hole for fitting a lock ball is formed to pass through the hole in a centrifugal direction, a lock ball is fitted into the taper hole so as to be able to move in and out of the fluid passage hole, and the lock ball is inserted into a socket. It has a socket that is restrained or released by the operation of a sleeve that is slidably fitted in the axial direction on the outer circumference of the plug body, and a fluid passage hole that is formed in the axial direction in the axial center of the plug body. It consists of a plug with a locking groove formed in the circumferential direction on the outer periphery of one end of the plug body that has the same hole, and which engages and disengages with the lock ball, and when both are fitted together, the plug is formed into a socket. In a pipe joint of the type in which the through hole and the through hole formed in the plug communicate with each other, and the lock ball provided in the socket and the locking groove formed in the circumferential direction of the plug engage, The surface of the lock ball's fitting taper hole or the surface of the lock ball is coated with resin or an elastic material, and the surface of the lock ball locking groove of the plug that pairs with the socket is at least the same as the lock ball and metal. Since the lock ball is made of metal or resin that does not engage with the lock ball, the surface of the lock ball should be made of synthetic resin, or a taper hole for fitting the lock ball in the socket that holds the lock ball, or a plug. By forming the surface of the lock ball retaining groove with an elastic material,
The locking part between the socket and plug does not have direct metal contact, and even if vibration is applied to the plug and socket in the thrust direction, the vibration is absorbed by the resin or elastic material, so the lock ball is used. There is no scratching or abrasion on the surface of the lock ball fitting taper hole or lock ball retaining groove, and the looseness during use of the pipe fitting is completely eliminated. death,
This has the effect of significantly increasing durability.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention divided into a plug and a socket. Fig. 1 is a longitudinal sectional front view of the plug, Fig. 2 is a longitudinal sectional front view of the socket, and Fig. 3 shows the main parts cut away. FIG. 4 is a front view of another embodiment of a socket with main parts cut away. 1.21 is a plug, 4, 22 is a lock ball locking groove, 5
, 23 is a socket, 14.25 is a tapered hole for fitting a lock ball, 16 and 28 are lock balls, and 17.29 is a sleeve.

Claims (1)

[Scope of utility model registration request] The socket body has a fluid passage hole oriented in the axial direction in the axial center, and a tapered hole for fitting the lock ball is provided near the open end of the socket body in the centrifugal direction. A sleeve is formed through the socket body, and a lock ball is fitted into the tapered hole so as to be freely protrusive and retractable with respect to the fluid passage hole, and the lock ball is fitted to the outer peripheral portion of the socket body so as to be slidable in the axial direction. It has a socket of a type that can be restrained or released by the operation of , and a fluid passage hole formed in the axial direction in the axial center of the plug body, and on the outer periphery of the plug body near the open end of the hole,
It consists of the above-mentioned lock ball and a plug with a locking groove formed in the circumferential direction for engaging and disengaging, and when the two are fitted together,
A through hole formed in the socket and a through hole formed in the plug communicate with each other, and a lock ball provided in the socket,
In a type of pipe joint that engages with a locking groove formed in the circumferential direction of the plug, the surface of the taper hole for fitting the lock ball of the socket or the surface of the lock ball is coated with resin or an elastic material, and the same A pipe joint characterized in that the surface of the lock ball locking groove of the plug that pairs with the socket is made of a metal strip or resin that does not engage at least the lock ball and the metal.