JPH09170688A - Universal rotary joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture at a low cost, and to facilitate the installation of a socket, by forming fluid joint rotatable along planes inclined at different angles each other to the axial direction, between an intermediate body and a nipple, and between a sleeve body and the intermediate body respectively. SOLUTION: A sleeve body 1, and a nipple body 2 are connected to both ends of a joint body 3 by making the joint body 3 as an intermediate body. The joint body 3 is formed of divided parts 4 and 4, and both members are sliding connected to surface rotate in the condition inclined at the angle θ to the longitudinal shaft at the sleeve side, and its connection is formed of a rotary joint 30. In this joint 30, plural balls 33 are filled to the groove lines 34 and 35 on the opposing surface between a pivoting ring 31 formed as a cylindrical recess of the divided part 4, and a shaft 32 formed as a tubular part housed to the recess of the divided part 5. By such a constitution, the processing of a spherical circular arc and a recessed circular arc is made unnecessary, the cost is low, a trouble to convert the angle of a plug by squeezing a socket in never generated, and the socket can be installed easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid joint for detachably connecting a tool and a hose for connecting a fluid compressor and a tool for supplying a compressed fluid to a portable fluid tool or the like, and more particularly to a tool. The present invention relates to a universal rotary joint in which the connecting direction of a hose is freely rotatable.

[0002]

2. Description of the Related Art As a universal rotary joint, Japanese Patent Publication No. 7-6
No. 2513 and JP-A-6-109176 are known. In these conventional techniques, a front arc of a spherical arc formed at the rear end of the nipple in order to allow the nipple portion to swing in the radial direction with respect to the sleeve body is inside a concave arc formed at the opening end of the nipple side joint. It was carried out by loosely fitting the ball into a ball and holding the back arc with a plurality of balls.

Further, an intermediate body having spherical arcs formed at both ends is interposed between the sleeve and the nipple, and the spherical arcs at both ends are loosely fitted in the concave arcs formed at the ends of the sleeve and the nipple, respectively, to freely rotate. It is known that by holding it so that it can freely rotate in a wider angle. Further, in this structure, a bellows-like cover for covering the rotating portion is attached in order to prevent dust and the like from entering the rotating portion and hindering the rotation.

[0004]

In the conventional rotary joint, it is necessary to form a spherical arc and a concave arc in the connecting portion, and there is a problem that a high technology is required for forming this and the manufacturing cost is increased. . Since it is necessary to form a spherical arc and a concave arc at each end, increasing the diameter of the fluid flow path inevitably increases the shape of the sphere, and as a result, the fluid pressure acts on a large surface to cause rotation. It became a cause of increasing the resistance of the and hindering the free bending.

Further, in the joint in which the spherical arc and the concave arc are combined and connected, both can freely swing, so that when the socket attached to the end of the hose is attached to the nipple, a pressing force acts on the nipple. Then, there was a problem that the nipple was inadvertently tilted and it was difficult to attach the socket.

Further, there is a phenomenon that the bellows-like cover is damaged or detached from the mounting portion, and dust or the like enters the rotating portion to make it difficult to rotate freely. JP-A-4-2
In the case of the rotary joint disclosed in Japanese Patent No. 36884, a plurality of steel balls are used to hold the spherical arc portion within the concave arc, but the tip of the screw that closes the opening for inserting the steel ball. Since the steel ball is extended into the groove, the steel ball cannot be revolved and resistance is exerted to the movement in the rotational direction between the two members. As a result, the action of twisting the hose or the like is relatively difficult.

The present invention is intended to provide a universal rotary joint which can be manufactured at low cost without requiring a spherical arc and a concave arc which increase the manufacturing cost. Further, it is an object of the present invention to provide a universal joint that allows easy mounting of the socket without inadvertently tilting the nipple when mounting the socket attached to the end of the hose.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a sleeve-side joint and a nipple-side joint are divided into two parts, and an intermediate member is arranged between the two members to form rotating planes inclined with respect to each other. By connecting them together, both members can freely rotate.

According to the present invention, a joint is constituted by a hollow sleeve body or plug body, a nipple body and a hollow intermediate body arranged between the hollow body and the plug body, and between the intermediate body and the sleeve body or the plug body and the nipple body. Forming fluid joints rotatable along planes inclined at mutually different angles with respect to the axial direction, and forming one rotation surface on a surface orthogonal to the extension direction of the axis line, The rotary joint part is composed of a cylindrical recess and a tubular part that is rotatably accommodated in the recess, and an annular groove (groove) formed in the cylindrical recess and an annular shape formed on the outer periphery of the tubular part. The above problem is solved by rotatably holding a plurality of balls, for example, steel balls, housed in the groove.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention functions as a fluid joint and also as a quick joint. A nipple body constituting one of the rotary joint portions is attached to one end of the sleeve body side, and one end of the nipple body is attached to the sleeve body side. A nipple is formed to connect a hose for fluid supply.

The intermediate body is connected at one end side to the other end of the nipple body via a rotary joint so as to be rotatable around the axis, and the intermediate body and the other end side and the other end side of the sleeve body are connected. Each of the outer shapes is formed in a hemispherical shape, and an inclined plane of rotation is formed by a surface that passes through substantially the center of the sphere and that is inclined with respect to the axis of the sleeve body. The rotary joint part is formed on the side of the member that forms one of the opposite planes of rotation and on the side of the member that forms the other plane, and on the side of the member that forms the other plane. The cylindrical recess is rotatably housed in the cylindrical recess. A fluid passage communicating with the hollow portion is formed at the bottom of the recess and at the center of the cylindrical portion, and the fluid passage is kept sealed by an annular seal member (O-ring) arranged between the outer periphery of the cylindrical portion and the peripheral wall of the cylindrical recess. To be done.

Further, it is rotatably held by an annular groove formed in the cylindrical recess outside the annular seal member and a plurality of steel balls housed in an annular groove formed on the outer periphery of the cylindrical portion. A steel ball is inserted into the groove through a hole that opens radially and the hole is closed by a set screw. Do not let the tip of the set screw protrude into the groove,
The steel ball is held in the groove so that it can rotate and revolve, and the rotation of both members is maintained well.

By forming two surface rotations having different angles from each other through the intermediate body between the sleeve body and the nipple body, the sleeve body and the nipple body are relatively three-dimensionally formed. It creates freedom in any direction. 2
One of the two rotating parts has a rotation surface that is orthogonal to the axis of the nipple body, and the pressing force when the socket is attached to the nipple body is received by the plane that intersects perpendicularly to generate an action force in the rotation direction of the socket. It has a structure that does not allow it.

[Embodiment 1] FIG. 1 shows an embodiment of the present invention.
The following is a description with reference to FIG. The universal joint according to the present invention comprises a sleeve body 1 forming a sleeve side joint, a nipple body 2 forming a nipple side joint, and a joint body 3, and as shown in the drawing, the sleeve 1
The nipple body 2 and the nipple body 2 are joined to both ends of the joint body 3 as an intermediate body. Reference numeral 6 is a fluid passage.

The sleeve body 1 is provided with a locking ball 11 for fixing a plug member (not shown), an operating ring 12 and a spring 13 for restricting the advance / retreat of this ball, and a spring 15 is provided in the sleeve body. A valve 14 for closing the fluid passage 6 is provided and functions as a quick coupling. 16 is a packing material. Further, the sleeve body 1 and the divided portion 4 of the joint body 3 are connected and fixed by screwing 17.

A nut 21 and a screw 22 are formed in the nipple body 2 as a connecting portion with a hose or the like, and a shaft 51 of another split portion 5 of the joint body is connected to a pivot ring 23 via a retaining ring 52. Is formed as the rotating portion 20 so that both members are connected in a sliding manner. Reference numeral 53 is a sealing material. The joint body 3 as an intermediate body is formed of two divided portions 4 and 5, and both of the divided portions are engaged with each other so as to rotate in a plane while being inclined at an angle θ with respect to the longitudinal axis on the sleeve side. They are connected and the connecting portion is formed by the rotary joint portion 30.

The rotary joint portion 30 has a pivotal ring 31 formed as a cylindrical concave portion formed in the divided portion 4 and a shaft 3 formed as a cylindrical portion accommodated in the concave portion formed in another divided portion 5.
It is carried out by filling a plurality of balls (steel balls) 33 into the respective groove lines 34 and 35 formed on the surface facing the groove 2. Further, the ball 33 is thrown in through the ball throwing hole 37, and after throwing in, the set screw 36 prevents the ball 33 from falling off. Reference numeral 58 is a sealing material.

In particular, as is apparent from FIG. 2, the two divided parts 45 forming the joint body 1 are formed such that the facing surfaces of both parts are substantially spherical, and the deformation to the outside is surfaced by the relative rotation. It is formed so as not to appear. Further, as shown in FIG. 3, the nipple body 2 can freely rotate with respect to the sleeve body 1 at an angle of maximum 2θ.

[Embodiment 2] The universal joint 10 in this embodiment has a sleeve portion 1 formed with a screw 11 for coupling to a fitting on the output side, as is apparent from FIGS. 4 and 6.
Is integrally formed with one of the split parts of the rotary joint part 3, and further, the plug 2 is formed at the end formed on the shaft 32 side formed in the tubular part.
1 is formed integrally with the other split portion of the other rotary joint portion 3 and is formed on the side of the pivot ring 31 formed as a cylindrical convex portion. Further, a rotation plane orthogonal to the axis is formed between the plug portion 2 and the intermediate body 7 functioning as a rotary joint portion, and inclined rotation surfaces 71 and 72 are formed between the intermediate body formed of a cylindrical body and the plug portion. Has been done. The two inclined planes of rotation are configured as elliptical planes obtained by obliquely cutting a cylinder. By setting the angle θ of the inclined plane of rotation to about 22.5 degrees with respect to the axis, the nipple portion can be set to about 90 degrees relative to the plug portion.
It is possible to swing at any angle within the range of degrees.

[0020]

According to the universal rotary joint of the present invention, the nipple portion and the sleeve are combined by combining the axial rotations on the two inclined planes without the need for machining requiring a high technology such as a spherical arc or a concave arc. It is possible to swing the parts relative to each other three-dimensionally, and it is possible to supply an inexpensive universal joint.

Further, since the angle of the nipple body is changed by rotating the plug portion or the intermediate body of the nipple on a plane, when the socket of the quick fluid coupling is mounted on the plug portion, the pressing force of the socket is Since it does not act as a rotating force on the socket, the socket can be easily mounted without changing the angle of the plug portion, tilting or shifting when the socket is pressed.

Since the angle is changed by rotating, the rotating force does not act only by the gravity of the plug portion or the nipple portion when the socket is not mounted, so that the plug portion or the nipple portion is not inadvertently bent. As a result, the shape with the socket removed is retained,
When the tool is stored in the case or the like, it becomes easy to store the tool in a predetermined space. Further, automatic assembly using a robot or the like is possible, and the manufacturing cost of the tool itself can be reduced.

Since the structure is such that the flat surfaces face each other and rotate, dust and the like are less likely to enter the rotary part, and the dust does not enter the rotary part without providing a cover such as a bellows for dust prevention, which makes rotation difficult. There is no influence such as becoming.

When the portion forming the rotation surface inclined with respect to the axis is formed in a cylindrical shape, the outer diameter shape is small and smart when the joint is arranged in a straight line. As compared with the external shape, a larger flow path diameter than the conventional one can be secured, the action of the fluid pressure can be reduced, and the rotation resistance due to the pressure action is small, so that more free rotation can be maintained.

When the portion forming the rotation surface inclined with respect to the axis is formed into a spherical shape, the outer shape in a state where the rotation flat surface portion is bent without causing a step on the peripheral edge of the flat surface due to the rotation is smart. become.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a universal joint according to the present invention.

FIG. 2 is a sectional view taken along line II of FIG. 1;

FIG. 3 is an explanatory view of the operation of the embodiment.

FIG. 4 is a front view of another embodiment.

5 is a longitudinal sectional view of FIG.

FIG. 6 is an explanatory view of the operation of another embodiment.

7 is a longitudinal sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sleeve body (plug part) 2 Nipple body (nipple part) 3 Joint body (intermediate body) 4 Dividing part 5 Dividing part 6 Passage 20 Rotating joint part 23 Pivoting ring (cylindrical recess) 30 Sliding part 31 Pivoting ring 32 Shaft (cylindrical part) 33 Ball 34 Groove 35 Groove 36 Set screw 37 Insertion hole θ Tilt angle

Claims (5)

[Claims] 1. A hollow nipple body having a mounting portion for a tool or a fluid hose formed at one end thereof, and a hollow sleeve body having one member constituting a quick fluid coupling mounted at the other end thereof. A hollow intermediate body disposed between the intermediate body and the nipple body, and between the sleeve body and the intermediate body are rotatable along planes inclined at different angles with respect to the axial direction. A universal rotary joint formed by forming each fluid joint. 2. The universal joint according to claim 1, wherein one of the two inclined planes is formed on a plane orthogonal to the extension direction of the axis. 3. A cylindrical recess in which each rotary fluid joint portion is formed on one member side along an axis perpendicular to each surface, and the other member rotatably accommodated in the recess. Both members are rotatably held by an annular groove formed on the inner wall of the cylindrical recess and a plurality of steel balls housed in an annular groove formed on the outer peripheral surface of the cylindrical portion. The universal joint according to claim 1 or 2, wherein 4. The outer shape of one end side of the intermediate body and one end side of the nipple portion on the side of the rotation surface formation are hemispheres, and one of the planes passes through substantially the center of the sphere and is inclined with respect to the axis of the nipple. The universal joint according to any one of claims 1 to 3, wherein the universal joint is formed as a flat surface. 5. The end portion of the nipple body on which the rotation surface is formed and the intermediate body are formed in the same cylindrical outer shape when they are arranged along the axial direction, and one plane is a cylinder. The universal joint according to claim 1, wherein the universal joint is formed by a plane inclined with respect to the axis of the.