JP2003120867A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that as a component having a claw is formed separately from a housing, it is very expensive, economically disadvantageous, and further the component has the influence on working efficiency. SOLUTION: This pipe joint is provided with a sealing rubber sleeve along an inner peripheral face of a housing provided with a bolt fastening mechanism formed on a cylindrical part having a discontinuous one end in the cylindrical direction, having angular parts inside in the inner peripheral direction, of the cylindrical axial both end parts, and having a flange provided with the claw on its inner peripheral edge.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting pipe-to-pipe butt portions. There is a housing type in which a discontinuous end is tightened while a constant gap is maintained in a pipe-to-pipe connected to one of the pipe joints. 2. Description of the Related Art A housing of this type of pipe joint has a bolt fastening mechanism at a cylindrical portion where one end in the circumferential direction is discontinuous, and has an inner circumferential direction at both ends in the cylindrical axial direction. It has a flange, the inner diameter of which is reduced by bolting, and a sealing ring with a sealing sleeve for the pipe to be connected to the inner surface and a claw portion that cuts into the pipe. The sleeve is in close contact with the entire circumference of the pipe end, and the claw bites into the outer circumference of the pipe so as to oppose the pulling force. [0004] This type of pipe joint is disclosed, for example, in German Patent No. 2428107, Japanese Patent Publication No. 55-25316, Japanese Patent Publication No. 57-50994, and Japanese Patent Publication No. 2-53.
No. 669, etc., there is a practically satisfactory connection between opposed tubes. [0005] However, pipe joints applied to such pipe-to-pipe also have the following problems. [0006] In this type of known pipe joint, the housing and the claw having a function of preventing the housing from being detached are formed as independent parts. That is, the component having the claw portion is, for example, a ring-shaped leaf spring having a conical cross-sectional shape, and has a structure in which a serrated claw portion is formed on the inner peripheral side. Then, this part is further tightened with the above-described tightening ring so that the outer periphery is positioned at an even-peripheral portion of a flange obtained by bending both end portions of the housing in the inner peripheral direction at a substantially right angle, and furthermore, the tip of the inner peripheral claw is provided. , Which are installed in the inner side of the housing, and have a structure in which the outer peripheral portion of the pipe bites at a certain angle due to the fastening force of the housing. [0007] Therefore, the number of components is increased, cost is increased, it is economically disadvantageous, and there is a problem that the work efficiency is affected. There is a problem that the performance is not stable depending on the position. SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems as described below. In the pipe joint according to the present invention, a bolt fastening mechanism is formed in a cylindrical portion where one end in the cylindrical direction is discontinuous, and both ends of the cylindrical shape have an angle inward in the inner circumferential direction at both ends in the axial direction. It is characterized in that a sealing rubber sleeve is mounted on a housing having a flange with a claw formed on an inner peripheral edge thereof along the inner peripheral surface of the housing. An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an example of a pipe joint according to the present invention, and FIG. 3 is an end view. This pipe joint has a bolt fastening mechanism at a discontinuous portion of the cylindrical housing 1 in which one end in the inner peripheral direction is discontinuous, has flanges 8 at both axial ends, and has an inner peripheral surface. A rubber sleeve 2 for sealing a pipe to be connected is mounted. Reference numeral 3 denotes a steel bridge that covers a discontinuous portion of the housing 1 in the circumferential direction. In the bolt fastening mechanism, a bar-shaped washer 5 and a bar-shaped nut 6 are inserted into the opposite ends of the clamping plate 7 at the opposite ends, and the bar-shaped washer 5 and the bar-shaped nut 6 are inserted.
Is formed by inserting the tightening bolt 4 into the bolt insertion hole formed in the hole. The flanges 8 formed at both ends in the axial direction of the cylindrical shape of the housing 1 are formed by being bent at an angle inward in the inner circumferential direction, and easily cut into the outer circumferential portion of the pipe at the inner circumferential edge thereof to prevent the housing from falling off. A nail 9 having a function is formed. The rubber sleeve 2 is inserted into the inner surface of the housing 1 along the inner peripheral surface between the flanges 8 formed between both ends in the cylindrical shape of the housing 1 in the axial direction. FIG. 4 is a sectional view showing an embodiment of the sectional shape of the claw 9 formed on the flange 8 of the housing 1. In (a), the claw 9 has a structure in which the cross-sectional shape is processed into a sharp sharp edge, and the tip of the claw 9 bites the surface of the tube to be connected. In (b), the claw 9 has a cross-sectional shape machined to a sharp edge and has the same structure as that of (a) that bites the connecting pipe surface. First, the tip 9a has a biting prevention function so that the tip 9a does not bite more than necessary when it is further tightened. This applies when the surface of the pipe to be connected is a soft material. The cross-sectional shape of the nail 9 shown in (c) is another embodiment of the nail shown in (b). FIG. 5 is a front view showing an embodiment of the front shape of the claw 9 formed on the flange 8 of the housing 1. In (a), the pawl 9 has a discontinuous structure such as a sawtooth or a gear so that the housing can be intensively tightened at the tip to improve the biting efficiency of the connecting pipe. It has become. In (b), after the nail 9 bites into the surface of the pipe to be connected and is further tightened, even if the nail is displaced in the direction perpendicular to the pipe axis on the surface of the pipe, it can slide efficiently. It has a structure with. In (c), the claw 9 has a structure having a function of efficiently realizing biting into the surface of the pipe to be connected. In (d), the claw 9 has a structure in which the claw 9 is efficiently digged even when the surface of the pipe to be connected is made of a hard material. Thus, the pipe joint according to the present invention has a bolt fastening function at a cylindrical portion where one end in the cylindrical direction is discontinuous, and has an angle inward in the inner circumferential direction at both ends in the cylindrical axial direction. It is formed by mounting a sealing rubber sleeve 2 along the inner peripheral surface of the housing 1 on a housing 1 having a flange 8 having a claw 9 formed on the inner edge thereof. The present invention has the following effects since it is constructed as described above. Since the flanges at both ends in the axial direction of the cylindrical shape of the housing are angled inward in the inner peripheral direction, and the claws are formed on the inner peripheral edge of the flanges, it is not necessary to use a tightening ring having the claws formed as before. became. Therefore, the number of components was reduced, and the tightening performance and work efficiency were improved. It also contributes to cost reduction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an embodiment of a pipe joint according to the present invention. FIG. 2 is a side view showing an embodiment of the pipe joint according to the present invention. FIG. 3 is an AA end view of FIG. 1; FIG. 4 is a sectional view of a claw formed on a flange;
(B) and (c) are example diagrams respectively. FIG. 5 is a front view of a claw formed on a flange, and FIG.
(B), (c) and (d) are examples of an embodiment. [Description of Signs] 1 Housing 2 Rubber sleeve 3 Steel bridge 4 Tightening bolt 5 Bar-shaped washer 6 Bar-shaped nut 7 Tightening plate 8 Flange 9 Claw

Continuation of front page    (72) Inventor Toshio Yuhara             23-5 Tatsutacho, Adachi-ku, Tokyo Taisei Corporation             Inside an industrial site F-term (reference) 3H015 DA04 DA11

Claims (1)

Claims: 1. A bolt fastening mechanism is formed at a cylindrical position where one end in a cylindrical direction is discontinuous, and both ends in the axial direction of the cylindrical shape have an angle inward in the inner circumferential direction. A pipe joint comprising a housing having a flange with a claw formed on an inner peripheral edge thereof, and a sealing rubber sleeve mounted along an inner peripheral surface of the housing.