JPH0689869B2 - Pipe connection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting device, and more particularly to a pipe connecting device in which a pipe is pushed into a tubular body so that the pipe can be easily joined.

[0002]

2. Description of the Related Art Conventionally, as this type of pipe joining device, the one described in Japanese Utility Model Publication No. 51-34021, which is the invention of the present applicant, is known. Thus, the one disclosed in the publication is such that a pair of cylinders are externally fitted and engaged on both sides of an inner cylinder that is fitted over both joint end face portions of a continuous pipe, and By tightening the cylinders arranged on both sides,
It is a continuous installation device for connecting pipes by fastening a retainer fitted between each pipe and each pipe to the pipes, and having a smaller diameter as the inner surfaces of both the pipes are moved away from the joint ends of the pipes. It is formed into a conical surface, and the outer edge of the retainer made of a cylindrical elastic body in which several annular ridges (bellows) are juxtaposed on the inner and outer peripheral surfaces is cut out from the inside and outside to make it thin. In this embodiment, holes are bored at appropriate intervals in the thin dimension portion, and balls having a diameter slightly larger than the hole diameter are fitted into the holes.

[0003]

In the above-mentioned conventional type, the retainer for each ball interposed between the outer peripheral surface of the connected pipes and the inner peripheral surface of the joint cylinder surrounding the pipe serves as a packing. Although it also has a function, since the retainer is formed relatively wide like a bellows, the tubular body is moved by being tightened with respect to the inner tubular body, and the retainer is also tightened so that a packing effect is obtained. In order to be expected, the contact area between the outer surface of the retainer and the inner surface of the cylinder is relatively large, and this portion becomes a resistance, so the tightening torque must be very large. For example, it cannot be securely tightened.

Therefore, there arises a technical problem to be solved in order to facilitate the insertion of the pipe and to expect a sufficient packing effect for the ball retainer and a pipe withdrawal prevention effect. The present invention aims to solve the problems.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above object. Both end faces of a tubular body are open, and pipes are inserted from the both open end faces for connection. In addition to the above, a pipe connecting device is formed by fitting an annular retainer made of an elastic material holding a large number of balls in the circumferential direction in the vicinity of the outside to the open end portions of the both ends of the cylindrical main body. At the open end portions of the both ends of the tubular body, an annular groove formed in a tapered inclined surface toward the outer peripheral end is formed, and further, the annular retainer has a shape conforming to the annular groove. It is characterized in that a large number of balls are formed in the vicinity of the outer end of the ball in the circumferential direction, and spaces are provided in the circumferential direction of the thick portion at the inner position facing the ball. It is intended to provide a pipe connecting device.

[0006]

When the pipe is inserted through the open ends of the tubular body, the end faces of the pipe are pressed against the balls held by the annular retainer. Then, the ball rolls inward and is pushed in. Thus, since the retainer is provided with the space portion facing the ball, the width of the space portion is narrowed when the ball is moved, which reduces the insertion force of the pipe. The insertion operation of the pipe becomes easy.

Furthermore, the annular retainer that has moved into the space is subjected to a force that restores the space, so that the balls are always in contact with the tapered surfaces of both ends of the cylindrical body and the outer peripheral surface of the pipe. When the pipe comes into pressure contact, the ball largely encroaches on the outer peripheral surface of the pipe and acts as a retainer even if a load is applied in the direction in which the pipe comes out, and the annular retainer can be expected to have a sufficient action as a packing. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway vertical cross-sectional view of the entire embodiment of the present invention. In FIG. 1, reference numeral 1 is a cylindrical body. Both end surfaces of the tubular main body 1 are opened, and the pipes 2 to be joined are inserted from the open portions. Then, the pipes 2, 2 are inserted until they come in contact with both side surfaces of the annular seal 4 fitted in the annular groove 3 provided at the center of the inner surface of the tubular body 1, The center of the body 1 is sealed.

Also, annular concave grooves 5 and 5 are provided on both sides of the annular seal 4, and the outer surfaces of the pipes 2 and 2 into which the annular packings 6 and 6 are fitted and inserted are sealed. The annular packing 6 has a protrusion 6a at the inner center thereof which is inclined toward the direction of the annular seal 4, and is tapered so that the inner diameter is larger than the tip end of the protrusion 6a in the outward direction. The crimp portion 6b is obliquely provided. Thus, when the pipes 2 and 2 are inserted, the projecting portions 6a are bent in the oblique direction, so that the inserting operation of the pipes 2 and 2 is facilitated and the crimping is performed by the elastic restoring force of the projecting portions 5a. The portion 6b is always pressed against the outer peripheral surfaces of the pipes 2 and 2.

Further, grooves 1a, 1a, which are notched from the end faces toward the center, are provided at the open ends of both ends of the cylindrical body 1. Further, screw parts 1b, 1b are engraved over a certain length from the end faces of the grooves 1a, 1a.
Sockets 7 and 7 having screw portions 7a and 7a to be screwed with b and 1b are screwed from the end surfaces of the grooves 1a and 1a, and the inner diameter of the inside is matched with the inner diameter of the tubular main body 1. Thus, tapered portions 7b and 7b are formed on the inner side surfaces of the sockets 7 and 7 so as to extend to the bottom surfaces of the grooves 1a and 1a. Thus,
The sockets 7, 7 are formed integrally with the cylindrical body 1 to form annular recessed grooves 1c, 1c formed at both end open portions of the cylindrical body 1 in a tapered inclined surface toward the outer peripheral end. become.

Further, the sockets 7, 7 may be formed integrally with the tubular body 1 when it is not necessary to disassemble the tubular body 1. Therefore, when disassembling the interior of the cylindrical main body 1, by unscrewing the sockets 7, 7,
The dismantling work becomes easy. In addition, annular retainers 8 and 8 formed in a shape that fits the annular concave grooves 1c and 1c formed by the tapered portions 7b and 7b of the sockets 7 and 7 and the grooves 1a and 1a of the cylindrical body 1 are provided. The annular retainers 8 and 8 are made of an elastic material such as a rubber material, and the tapered portions 8a and 8a thereof are connected to the tapered portions 7b and 7 of the sockets 7 and 7, respectively.
It is formed so as to be brought into contact with b, and the thick portions 8b, 8b are brought into contact with the grooves 1a, 1a of the cylindrical main body 1 so that they can be fitted respectively. Thus, the tapered portions 8 of the annular retainers 8 and 8 are
Holes 10, 10 ... for holding the balls 9, 9 ... Are bored in the peripheral surfaces of the holes a, 8a.
.. are respectively fitted with balls 9, 9 ...
Further, the inner diameters of the holes 10, 10 ... Are made smaller than the diameters of the balls 9, 9 ... In order to prevent the balls 9, 9 ... Further, the thick portion 8 facing the balls 9, 9 ...
Space portions 11, 11 ... Are opened at the b and 8b portions, respectively. Thus, in the drawings of this embodiment, each of the space portions 11 is formed in a substantially rectangular shape, but it is not limited to this. Further, the width of each of the space portions 11 in the axial direction is set to H, and the holding portions of the annular retainers 8, 8 for holding the balls 9, 9 ... Further, in order to promote the independent function, a portion indicated by a chain line in FIG. 2 may be cut out in advance.

Since the above-described one embodiment of the present invention has a structure as described above, as shown on the right side of FIG.
, Is inserted into the cylindrical main body 1, the end surface of the pipe 2 is pressed against the balls 9, 9 ... And the balls 9, 9 ... Are rolled and pushed in. At this time, based on the movement of the balls 9, 9 ..., The elastic resistance of the annular retainer 8 escapes to the space portions 11, 11 ... which are provided facing the balls 9, 9. As a result, the insertion operation of the pipe 2 becomes extremely easy, and as shown on the left side of FIG. 1, the width of H of the space portions 11, 11, ... Is extremely narrowed so that the balls 9, 9 ... Then, the pipe 2 is pressure-bonded to the outer peripheral surface of the pipe 2, and in combination with the elastic restoring force of the annular retainer 8, it functions as a packing and as a pull-out preventing function for the pipe 2.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified version.

[0014]

Since the present invention is as described in detail in the above-mentioned one embodiment, the shape is extremely simple and mold making is possible, which also contributes to cost reduction. Further, since the ball holding portion can independently act on the other annular retainer portion, the pushing operation of the pipe can be facilitated. That is, when pushing the pipe, the space portion provided facing the ball absorbs the pushing force of the pipe, so that the pipe can be pushed lightly. Furthermore,
After inserting the pipe, the elastic restoring force of the narrowed space acts to press the annular retainer and the ball against their respective abutting surfaces to act as a packing and a pipe withdrawal prevention function. Can be played simultaneously.

[Brief description of drawings]

FIG. 1 is a side view of a partly cutaway vertical section of the present invention.

FIG. 2 is a partially cutaway plan view of the annular retainer in a developed state.

FIG. 3 is a partially cutaway plan view showing a function of a ball holding portion of the annular retainer.

[Explanation of symbols]

 1 tubular body 1a groove 1c annular groove 2 pipe 7 socket 7b taper portion 8 annular retainer 8a taper portion 8b thick portion 9 ball 10 hole 11 space portion

Claims (1)

[Claims] 1. Both ends of the tubular body are opened, and a pipe can be inserted from the opened both ends so as to be connected, and a large number of balls are provided at the both end open portions of the tubular body. In a pipe connecting device formed by fitting annular retainers made of elastic material, each of which is held in the circumferential direction near the outside, one by one,
An annular concave groove formed in a tapered inclined surface toward the outer peripheral end is formed at the open end portions of the both ends of the tubular body,
Further, the annular retainer is formed in a shape that fits in the annular groove, holds a large number of balls in the circumferential direction near the outer end thereof, and has a thick portion at an inner position facing the ball. A pipe connecting device characterized in that space portions are provided in the circumferential direction.