JP3407786B2 - Swivel joint - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] In order to supply a compressed fluid to a portable fluid tool or the like, a hose connecting the fluid compressor and the tool and a tool are detachably connected. More particularly, the present invention relates to a swivel joint in which a connecting direction between a tool and a hose is freely rotatable. 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 prior arts, a front arc of a spherical arc formed at the rear end of the nipple to allow the nipple portion to freely swing in the radial direction with respect to the sleeve body is formed within a concave arc formed at the opening end of the nipple side joint. This is done by loosely fitting the ball and holding the arc after the spherical arc with a plurality of balls. Further, an intermediate member having spherical arcs formed at both ends is interposed between the sleeve and the nipple, and the spherical arc portions at both ends are loosely fitted into concave arcs formed at the ends of the sleeve and the nipple to freely rotate. There is known a device that enables free rotation of a wider angle by holding as possible. Furthermore, in this structure, a bellows-like cover that covers the rotating unit is attached to prevent dust or the like from entering the rotating unit and preventing rotation. [0004] In the conventional rotary joint, it is necessary to form a spherical arc and a concave arc at the connecting portion, and a high level of technology is required to form the spherical arc and the concave arc, which increases the manufacturing cost. was there. Since it is necessary to form a spherical arc and a concave arc at each end, increasing the fluid flow path diameter inevitably increases the shape of the sphere, and as a result, the fluid pressure acts on a large surface and rotates. This increases the resistance of the cable and hinders free bending. Further, in a joint in which a spherical arc and a concave arc are combined and joined, both can swing freely, so that when the socket attached to the end of the hose is mounted on the nipple, a pressing force acts on the nipple. Then, the nipple part is tilted carelessly, and there is a problem that mounting of the socket is difficult. Further, a phenomenon has occurred in which the bellows-shaped cover is damaged or comes off from the mounting portion, and dust or the like enters the rotating portion, so that free rotation is reduced. 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 in the concave arc, but the tip of the screw for closing the opening for inserting the steel ball is used. The steel ball cannot revolve due to the structure extending into the groove, which causes resistance in the rotational movement between the two members. As a result, it is relatively difficult to twist the hose or the like. SUMMARY OF THE INVENTION An object of the present invention is 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 another object of the present invention to provide a universal rotary joint in which the socket can be easily mounted without inadvertently tilting the nipple when the socket attached to the end of the hose is mounted. According to the present invention, there is provided at one end side.
And a hollow nipple body having a mounting portion for a tool or fluid hose at one end, and a hollow nipple body at the other end.
And a hollow sleeve body having a quick fluid coupling on one end side, and a hollow intermediate body disposed therebetween .
A swivel joint, wherein the intermediate is the sleeve
A split portion connected to one end of the body, and the other end of the nipple body
And another shaft connected to the split part.
And other divided portions, and the divided portions and
The surface facing the other divided part is opposite to the axial direction of the sleeve body.
To a predetermined angle, and the other divided portions face each other.
Rotatable about the other axis in the plane
And the axial direction of the nipple body is relative to the facing surface.
While being tilted at a predetermined angle, and
The nipple body is connected rotatably about an axis ,
Between the other divided part of the body and the nipple, around the axis
Form a rotatable fluid coupling, three other
Between the sleeve and the sleeve
A flow rotatable in the opposing plane and about the other axis
A body joint is formed . DETAILED DESCRIPTION OF THE INVENTION The present invention functions as a fluid joint and also functions as a quick joint. A nipple body constituting one of a rotary joint portion is attached to one end of a sleeve body side. A nipple for connecting a fluid supply hose is formed at one end of the nipple body. The intermediate body is connected at one end to the other end of the nipple body via a rotary joint so as to be rotatable around an axis. The intermediate body, the other end and the other end of the sleeve body are connected to each other. Each of the external shapes is formed in a hemispherical shape, and the inclined rotation plane is formed by a surface which passes through substantially the center of the sphere and is inclined with the axis of the sleeve body. The rotary joint has a cylindrical recess formed along a vertical axis with respect to the plane on the member forming one of the planes of rotation, and a member formed on the member forming the other plane. And a cylindrical portion rotatably accommodated in the cylindrical concave portion. A fluid passage communicating with the hollow portion is formed at the bottom of the concave portion and at the center of the cylindrical portion, and the fluid passage is maintained sealed by an annular seal member (O-ring) disposed between the outer periphery of the cylindrical portion and the peripheral wall of the cylindrical concave portion. Is done. Further, at an outer position of the annular seal member, it is rotatably held by an annular groove formed in the cylindrical concave portion and a plurality of steel balls accommodated in the annular groove formed on the outer periphery of the cylindrical portion. A steel ball is inserted into the groove from a radially opened hole, and the hole is closed by a set screw. Do not project the tip of the set screw into the groove,
The steel ball is held so as to be able to rotate and revolve in the groove, so that the rotation of both members is maintained well. [0013] By forming two plane rotations at different angles from each other via an intermediate body between the sleeve body and the nipple body, the sleeve body and the nipple body are relatively three-dimensionally moved. This gives you freedom in any direction. 2
One of the rotating parts is composed of a rotating surface that is perpendicular to the axis of the nipple body, and receives the pressing force when the socket is mounted on the nipple body on a plane that is orthogonal to the socket, generating a rotational acting force on the socket. There is a structure that is not allowed. Embodiment 1 The embodiment of the present invention is described below with reference to FIGS. 1 and 2. The universal rotary joint according to the present invention includes 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 figure, the sleeve 1 and the nipple body 2 The joint body 3 is used as an intermediate body and is connected to both ends thereof. Reference numeral 6 denotes 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 for regulating the advance and retreat of the ball, and a spring 13. A valve 14 for closing the fluid passage 6 is provided and functions as a quick coupling. Reference numeral 16 denotes 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 connecting portions for connecting to a hose or the like, and the shaft 51 of the other divided portion 5 of the joint body is connected to the pivot ring 23 via a retaining ring 52. The rotating member 20 is formed so that the two members are slidably connected to each other. 53 is a sealing material. The joint body 3 as an intermediate body is formed of two divided parts 4 and 5, and the two divided parts make a surface rotation while being inclined at an angle θ with respect to the longitudinal axis on the sleeve side. The connecting portion is formed by a rotating joint portion 30. The rotary joint 30 has a pivot ring 31 formed as a cylindrical concave portion formed in the divided portion 4 and a shaft 3 formed as a cylindrical portion housed in the concave portion formed in the other divided portion 5.
This is performed by filling a plurality of balls (steel balls) 33 into the respective grooves 34 and 35 formed on the surface facing the surface 2. The ball 33 is thrown in through the ball throw-in hole 37, and after thrown in, is prevented from falling off by the set screw 36. Reference numeral 58 denotes a sealing material. In particular, as apparent from FIG. 2, the two divided portions 4 and 5 forming the joint body are formed so that the opposing surfaces of the two portions are substantially spherical. It is formed so that it does not appear. As shown in FIG. 3, the nipple body 2 can freely rotate at an angle of up to 2θ with respect to the sleeve body 1. Embodiment 2 The swivel joint 10 in this embodiment is particularly shown in FIGS.
As shown in FIG. 7 , the screw 1 to be connected to the mounting fixture on the output side
1 is formed integrally with one of the divided portions of the rotary joint portion 3, and the plug portion 2 formed on the shaft 32 side formed in the cylindrical portion and having the plug 21 formed at the end is replaced with another plug portion 2. The rotary joint 3 is formed integrally with the other one of the divided parts, and is formed on the pivot ring 31 side formed as a cylindrical convex part. A rotation plane perpendicular to the axis is formed between the plug 2 and the intermediate 7 functioning as a rotary joint, and the inclined rotation surfaces 71 and 72 are formed between the cylinder-shaped intermediate and the plug. Have been. Inclined 2
The two rotating surfaces are formed as elliptical surfaces obtained by diagonally cutting a cylinder. By setting the angle θ of the inclined rotation plane to about 22.5 degrees with respect to the axis, the nipple can swing at an arbitrary angle within a range of about 90 degrees with respect to the plug. . [0020] [0021] [0022] In universal rotary joint of the present invention does not require machining requiring a high degree of technology, such as spheres arcs and concave circular arc, axial rotation on two inclined planes By combining these, it is possible to swing the nipple portion and the sleeve portion relatively three-dimensionally, and it is possible to supply an inexpensive universal joint. Further , since the angle of the plug portion or the intermediate member of the nipple body changes when the plug portion or the intermediate member rotates on a plane, when the socket of the quick fluid coupling is mounted on the plug portion, the pressing force of the socket is reduced by the plug portion. Therefore, the socket can be easily mounted without changing the angle of the plug portion, falling down, or shifting due to the pressing of the socket. [0024] [0025] For the structure angle is changed by rotating the rotary part, the plug part or the nipple portion for just gravity of the plug portion or the nipple portion rotational force does not act when not wearing the socket Do not bend carelessly. As a result, the shape in a state where the socket is removed is maintained, so that the tool can be easily housed in a predetermined space when housed in a case or the like. In addition, automatic assembling using a robot or the like can be performed, and the manufacturing cost of the tool itself can be reduced. Since the structure is such that the planes face each other and are rotated, dust and the like hardly enter the rotating section. Even without providing a cover such as a bellows for dust prevention, the dust does not enter the rotating section and the rotation is slow. 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 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, and the effect of the pressure of the fluid can be reduced, so that the rotation resistance due to the pressure action is small and more free rotation can be maintained. When the portion forming the rotation surface inclined with respect to the axis is formed in a spherical shape, the outer shape in a state where the rotation is made to be refracted without generating a step in the periphery of the plane due to rotation is smart. become.

[Brief description of the drawings] FIG. 1 is a sectional view of a main part of a universal rotary joint according to the present invention. FIG. 2 is a sectional view taken along line II of FIG. 1; FIG. 3 is an operation explanatory view of the embodiment. FIG. 4 is a front view of another embodiment. FIG. 5 is a longitudinal sectional view of FIG. 4; FIG. 6 is an operation explanatory view of another embodiment. FIG. 7 is a longitudinal sectional view of FIG. 6; [Explanation of symbols] 1 sleeve body (plug part) 2 Nipple body (nipple part) 3 Joint body (intermediate body) 4 Division 5 Division 6 passages 20 Rotary joint 23 pivot ring (cylindrical recess) 30 Sliding part 31 pivot ring 32 axes (cylindrical part) 33 balls 34 Groove 35 Groove 36 Set screw 37 Input hole θ tilt angle

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 27/06

Claims (1)

(57) a hollow nipple body forming the mounting portion of the tool or the like or fluid hose at one end while being positioned to the Claims 1 one end side, while being disposed on the other end a hollow sleeve body having a rapid fluid coupling at one end, disposed therebetween
A swivel joint comprising a hollow intermediate body, wherein the intermediate body is a split joint connected to one end of the sleeve body.
Part, a shaft connected to the other end of the nipple body and the split
Formed with other divisions having other shafts connected to the part
And the surface of the divided portion facing another divided portion.
Is inclined at a predetermined angle with respect to the axial direction of the sleeve body, and
One of the other divisions in front of the division in its opposing plane
The nipple body is rotatable about another axis, and the axial direction of the nipple body is
While being tilted at a fixed angle, the axis of the other division
The nipple body is rotatably connected to the nipple body, and the shaft is provided between the other divided portion of the intermediate body and the nipple body.
Form a fluid coupling that can rotate around, and with the other divisions
Inclined with respect to the axial direction of the sleeve body
Rotatable in the obliquely facing surface and about the other axis
Swivel joint characterized by the formation of a functional fluid coupling .