JP2008008389A - Universal rotary joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a universal rotary joint which can be bent at 90° or more while avoiding danger even when the joint has any angle at both ends. <P>SOLUTION: The universal rotary joint comprises joint parts 1, 2 provided at both ends to be connected to a tool or a fluid hose. The joint parts 1, 2 are connected to each other via a plurality of intermediate bodies 3, 4 to continuously form a continuous fluid passage 11 in the joint parts 1, 2 and the intermediate bodies 3, 4. The intermediate bodies 3, 4 are formed cylindrical with their end faces inclined to an axial center p. Both intermediate bodies 3, 4, and the intermediate bodies 3, 4 and the both-end joint parts 1, 2 are put in end-face contact with each other and turnably connected to each other around the centers of the end faces, respectively. There are at least two inclined end faces. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a fluid coupling for connecting a fluid tool and a hose extending from a fluid compressor, such as a fluid tool using a fluid such as compressed air as a drive source. The present invention relates to a universal rotary joint that can be freely changed.

  This type of universal rotary joint has a plug at one end and a nipple at the other end. For example, when connecting a nailing machine using compressed air and an air compressor with such a universal rotating joint, a plug of the universal rotating joint is screwed to the end of the nailing machine, and the opposite side is connected. The air hose and the nailing machine are coupled by fitting the nipple into a socket provided at the end of the air hose connected to the air compressor.

Since the universal rotary joint can swing the nipple in all directions with respect to the plug, it is difficult for the weight of the air hose to be directly transmitted to the operator when the direction of the nailer is changed. For this reason, the effect that fatigue does not accumulate easily even for long-time work is obtained. As such a universal rotary joint, the one disclosed in Patent Document 1 is known. This is a configuration in which one intermediate body is interposed between the plug and the nipple. Since the plug and the nipple are basically formed in a columnar shape, the outer surface of the intermediate body is preferably formed in a columnar shape. By the way, the intermediate body and the plug or nipple are formed with an inclined end surface inclined with respect to the axis, and the central portion of the inclined end surface is rotatably connected by fitting uneven portions orthogonal to the inclined end surface. ing. Therefore, when the other of the joints is rotated around the fitting portion, both of them form a certain angle.
JP 2003-148668 A

  By the way, in the actual work, the nailing machine needs to be directed in various directions. For example, the nailing machine and the air hose are perpendicular to each other, such as nailing in a narrow place or driving toward the ceiling. There are cases where it is necessary to work in such a state that it bends so rapidly as described above.

  However, the method of Patent Document 1 can be bent only about half of 90 degrees. Theoretically, if the angle of the inclined end face is 45 degrees, it can be bent up to 90 degrees, but the inclined end face is not circular but elliptical. The ellipse becomes elongated as the angle increases. For this reason, when the angle of the inclined end face is 45 degrees with respect to the axis, when the bending angle is minimum, that is, when the whole is straight, and when it is bent at the maximum angle, that is, 90 degrees, There is no problem because the inclined end faces of each other are in close contact with each other. However, when one of the joints is in a sideways direction with respect to the other, that is, when they are at an angle of 45 degrees, the inclined end surfaces are in a state of protruding without contacting each other. Since the edge of the protruding part has an acute angle, it is dangerous if it is exposed.

  Further, when the nailing machine is used with the ceiling facing the ceiling as shown in FIG. 11, the nailing machine N and the air hose 8 are inclined at about 45 degrees. It feels heavy for the operator and it is difficult to handle the air hose.

  An object of the present invention is to solve the above-mentioned drawbacks and to provide a universal rotary joint that can be bent to 90 degrees or more without any danger regardless of the angle of both ends of the joint.

In order to solve the above-mentioned problem, the invention according to claim 1 has a joint portion for connecting to a tool or a fluid hose at both ends, and these joint portions are connected via a plurality of intermediate bodies. A continuous fluid passage is formed inside the intermediate portion and the intermediate body, and an inclined end surface inclined with respect to the axial center is formed at an end portion of the intermediate body, and the intermediate body and the intermediate body and the both end joints are formed. With the end surfaces being in contact with each other, they are connected to each other so as to be rotatable around the center of the end surfaces, and two or more inclined end surfaces are provided.

  According to a second aspect of the present invention, in the first aspect, at least one intermediate body among the intermediate bodies is formed with inclined end faces that are inclined opposite to each other with respect to the axis. .

  The invention according to claim 3 is characterized in that, in claim 2, two or more of the intermediate bodies having inclined end faces at both ends are provided.

  According to the first aspect of the present invention, a bending angle that is twice as large as the inclination angle can be obtained with one inclined end face of one intermediate body. A bending angle will be obtained. Therefore, if the inclination angle with respect to the axis of the inclined end surface is 22.5 degrees, an intermediate body having inclined end faces of different angles at both ends is disposed between the nipple body and the sleeve body, so that a maximum of 90 degrees can be obtained. Bending angle can be obtained.

  Further, since the inclination angle of the inclined end face can be small, the shape of the inclined end face is close to a circle. For this reason, even if it is bent at an intermediate angle between the maximum and minimum, the protruding portion of the inclined end surface can be small and the risk is small.

  According to the second aspect of the present invention, since two inclined end faces are formed on one intermediate body, a large bending angle can be obtained with a small number of intermediate bodies.

  According to the invention which concerns on Claim 3, even if the inclination of the inclination end surface of one rotary body is small, a big bending angle as a whole can be obtained.

  Next, the embodiment of the present invention will be described with respect to a universal rotary joint that connects an air hose leading to an air compressor and a nailing machine.

  FIG. 1 is a side view of the universal rotary joint A, and FIG. 2 is a central longitudinal sectional view thereof. This universal rotary joint A is formed by connecting and disposing first and second intermediate bodies 3 and 4 between a hollow sleeve portion 1 at one end and a hollow nipple portion 2 at the other end forming a joint portion. Therefore, as shown in FIG. 4, a male screw portion 7 corresponding to the connecting female screw 6 provided at the end of the air chamber of the nailing machine N is formed on the outer periphery of the end portion of the sleeve portion 1. ing. The nipple portion 2 is a mounting portion for the end socket 10 of the air hose 8.

  First, the end portion of the sleeve portion 1 is formed in a cylindrical shape, and its end surface 12 is a vertical end surface that is formed perpendicular to the axis p1 of the sleeve portion 1, and a circular recess 13a is formed in the middle. Has been.

  The first intermediate body 3 has an end face 16 at one end of a main body 3a whose outer peripheral surface is formed in a columnar shape, and a vertical end face perpendicular to the axis p1 of the main body 3a coaxial with the axis p1 of the sleeve portion 1. A cylindrical hollow connecting shaft 17a that can be fitted into the circular recess 13a from the center is formed to project in the direction of the axis p1.

  A storage annular hole 14 for the bearing 22 is formed between the inner peripheral surface of the circular recess 13a and the outer peripheral surface of the connecting shaft 17a. As shown in FIG. A bearing insertion screw hole 15 is formed in the annular ring hole 14.

  In addition, the structure of the circular recessed part 13a and the connection shaft 17a is the same as the structure of the circular recessed parts 13b and 13c and the connection shafts 17b and 17c, which will be described later.

  On the other hand, the other end surface 18 of the first intermediate body 3 is an inclined end surface that is inclined with respect to the axis p1. Further, the connecting shaft 17b protrudes from the center of the inclined end surface 18 in the vertical direction, and the axis p3 of the connecting shaft 17b forms an angle θ with respect to the axis p1.

  Next, the 2nd intermediate body 4 has the 1st inclination end surface 23a and the 2nd inclination end surface 23b which incline on the opposite side with respect to the axial center p4 of the main body 4a in the both ends of the column-shaped main body 4a. .

  A circular recess 13b that fits to the connecting shaft 17b of the first intermediate body 3 is formed in the center of the first inclined end surface 23a perpendicularly to the first inclined end surface 23a. Further, from the center of the second inclined end surface 23b, a connecting shaft 17c having the same shape as the connecting shafts 17a and 17b of the first intermediate body 3 is formed so as to protrude perpendicularly to the second inclined end surface 23b. The axis p5 of the connecting shaft 17c is formed so as to be inclined at an angle θ on the opposite side to the axis p4 of the main body 4a.

  In addition, when the whole is in a straight state, the shaft centers p1 and p2 of the sleeve portion 1, the first intermediate body 3, and the nipple portion 2 are coaxial.

  Furthermore, the end portion of the nipple portion 2 is formed in a cylindrical shape, and its end surface 24 is an inclined end surface. In the center of the inclined end surface 24, a circular concave portion 13c is formed so as to be fitted to the connecting shaft 17c.

  When the first intermediate body 3 and the second intermediate body 4 are connected between the sleeve portion 1 and the nipple portion 2 having the above configuration, the first intermediate body 3 is connected to the circular recess 13a of the sleeve portion 1. As shown in FIG. 3, the shaft 17 a is fitted, and the bearing 22 is inserted into the annular hole 14 for the bearing formed thereby from the screw hole 15 of the sleeve portion 1 and closed with the embedded screw 25. Next, the connecting shaft 17b provided on the inclined end surface 18 of the first intermediate body 3 is fitted into the circular recess 13b of the first inclined end surface 23a of the second intermediate body 4, and the bearing 22 is inserted in the same manner as described above. To do. Further, the connecting shaft 17c of the second inclined end face 23b of the second intermediate body 4 is fitted into the circular recess 13c at the end of the nipple portion 2, and the bearing 22 is inserted. Thereby, the universal rotary joint A shown in FIG. 1 can be obtained. When the entire universal rotary joint A is straight, the shaft centers p1, p4, and p2 are common, and the outer peripheral surfaces of the sleeve portion 1 and the first and second intermediate bodies 3 and 4 and the nipple portion 2 are mutually connected. Smooth surface with no steps. Further, the end faces 12 and 16, 18 and 23a, and 23b and 24 which are in contact with each other at the end portions are in close contact with each other. The fluid passage 11 is also configured to continue from one end to the other end via the connecting shaft 17 of the first and second intermediate bodies 3 and 4.

  Next, the operation of the swivel joint A having the above configuration will be described. When the second intermediate body 4 is rotated 180 degrees around the connecting shaft 17b from the state of FIG. 2 to make it as shown in FIG. 5, the shaft center p2 on the nipple portion 2 side has an angle between the shaft centers p1 and 2θ before the rotation. Will do. Next, when the nipple part 2 is rotated by 180 degrees about the connecting shaft 17c as shown in FIG. 6, the axis p2 on the nipple part 2 side has an angle between the axes p4 and 2θ in the state of FIG. 3 before the rotation. Will do. Therefore, when the straight state in FIG. 2 is changed to the maximum bending state in FIG. 6, a bending angle corresponding to a maximum of 4θ can be obtained. That is, if θ is 23 degrees, it can be bent up to 92 degrees. The fluid passage 11 communicates from one end to the other end.

  Accordingly, as shown in FIG. 4, the sleeve portion 1 is screwed into the connecting female screw 6 provided at the rear end portion of the grip 5 of the nailing machine, and the end socket of the air hose 8 is connected. After the nipple portion 2 is connected and fixed to the nail driver 10 and connected to the air hose 8, the nail driver N and the air hose 8 are substantially perpendicular to each other as shown in FIG. Even if it is used in this way, the universal rotary joint A follows it, and the weight of the air hose does not act in the direction in which the moment acts on the nailer, so that the work is easy. Further, since the air hose can be configured not to protrude in the grip axis direction of the nail driver, the nail driver can be used in a narrow portion without worrying about the protruding portion of the air hose, and the air hose can be easily handled.

  Moreover, since the inclination of the inclined end surfaces 18 and 23a of the first and second intermediate bodies 3 and 4 is around 23 degrees, the shapes of the inclined end surfaces 18 and 23a are almost elliptical. Therefore, when the nipple part 2 forms 30 degrees or 70 degrees with respect to the sleeve part 1, some of the inclined end faces 18 and 23a are shifted and protrude, but the amount of protrusion is small. Absent.

  Alternatively, the first and second intermediate bodies 3 and 4 may all be connected with one end face inclined and the other end face as a vertical end face. The end surface of the sleeve body may also be an inclined end surface. Further, the relationship between the circular recess and the connecting shaft between the sleeve portion, the intermediate body, and the nipple portion is not limited to the embodiment, and the positional relationship between the circular recess and the connecting shaft may be reversed as appropriate.

  Next, as in the case of the intermediate body, the entire bending angle can be increased by connecting many intermediate bodies having inclined end surfaces at both ends. For example, FIG. 8 shows an example in which two intermediate bodies 4a and 4b having inclined end surfaces at both ends are provided. In this case, since there are three inclined end surfaces, the overall maximum angle is 6θ, that is, a bending angle of 138 degrees. be able to. FIG. 9 shows an example in which three intermediate bodies 4a, 4b, and 4c having inclined end surfaces at both ends are provided. In this case, since there are four inclined end surfaces, the overall bending angle is 8θ, that is, 184 degrees. I can.

  Further, the joint portions at both ends of the universal rotary joint A are not necessarily limited to the sleeve portion 1 and the nipple portion 2. For example, as shown in FIG. 10, a female screw portion 6 may be formed on the nipple portion 2 side. In this case, since there are many types of joints having male threads that match the female thread portion 6, the range of use is greatly increased.

Side view of the universal rotary joint according to the present invention Center vertical cross-section of the above universal rotary joint Sectional drawing on the XX line of FIG. Side view of the nailing machine and the air hose connected via the universal rotary joint Side view of the second intermediate body rotated 180 degrees Side view of the nipple rotated 180 degrees Explanatory drawing of another use mode of the universal rotary joint Bending state explanatory diagram when two intermediate bodies having inclined end faces at both ends are provided Bending state explanatory diagram when three intermediate bodies having inclined end faces at both ends are provided Partial cross-sectional view of a universal rotary joint with one joint as an internal thread Explanatory drawing of usage of prior art universal rotary joint

Explanation of symbols

A Swivel joint 1, 2 Joint 3 First intermediate 4 Second intermediate

Claims (3)

It has joints for connecting to tools, etc. or fluid hoses at both ends, and these joints are connected via a plurality of intermediate bodies, and a continuous fluid passage is formed continuously between the joints and the intermediate bodies. And
An inclined end surface that is inclined with respect to the axial center is formed at the end of the intermediate body,
The intermediate bodies and the intermediate body and the both end joints are connected to each other so as to be rotatable around the center of the end faces in a state where the end faces are in contact with each other, and two or more inclined end faces are provided. Features a universal rotary joint.   2. The universal rotary joint according to claim 1, wherein at least one of the intermediate bodies is formed with inclined end faces that are inclined opposite to each other with respect to an axis thereof. 3. The universal rotary joint according to claim 2, wherein two or more intermediate bodies having inclined end surfaces at both ends are provided.

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