JP3420344B2 - Clamp fitting - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp joint,
More specifically, the present invention relates to a clamp joint that connects two pipes by fitting a plurality of clamp bands on the outer circumferences of the abutting portions of the two pipes and tightening rib portions of the plurality of clamp bands.

[0002]

2. Description of the Related Art As a conventional clamp joint, as shown in FIGS. 7 and 8, a pair of clamp bands 1 for sandwiching and fixing the abutting portions Wa of ferrule portions W of two pipes.
A clamp joint 100 having 01, 101 is known. In this clamp joint 100, one end portion of a pair of semicircular clamp bands 101, 101 is pivotally attached to a hinge member 102 in an openable and closable manner, and rib portions 103, 103 overlapping with each other in the tangential direction of the pipe are provided at the other end. The bolt member 1 is formed on the rib portion 103 of one of the clamp bands 101.
04 is swingably supported, and a through hole 105 through which a bolt member 104 penetrates is formed in the rib portion 103 of the other clamp band 101, and a wing nut member that can be screwed to the tip end portion of the bolt member 104. 106 are provided.

In order to connect the ferrule parts W, W of two pipes using the clamp joint 100, the abutting parts Wa, Wa of the ferrule parts W, W of the two pipes are butted to each other via the gasket 107. Then, the inner peripheral sides of the pair of clamp bands 101, 101 are fitted into the outer peripheral parts of the abutting parts Wa, Wa of the ferrule parts W, W of the two pipes, and at this time, the bolts of one clamp band 101 Through the member 104 through hole 1 of the other clamp band 101
05, and the wing nut member 106 is screwed onto the tip of the bolt member 105 to attach the pair of clamp bands 101, 10
2 by tightening the ribs 103, 103 of 1
Abutting parts Wa, W of ferrule parts W, W of one pipe
Hold and fix a.

[0004]

However, in the case of the above-mentioned conventional clamp joint, the following problems occur. That is, the rib portions provided on one side of the pair of clamp bands are opposed to each other in the tangential direction of the pipe, and the bolt member and the nut member are used to tighten from the tangential direction. Due to metal friction or the like between the band and the band, a partial tightening force is likely to be generated, and leakage occurs from a part of the gasket. The rib portion of the clamp band projects from the outer periphery of the clamp band, and since the wing nut member for tightening the pair of clamp bands becomes large, the space occupied by the pipes having the clamp joints becomes large. In addition, in order to solve the above, it is possible to provide rib portions on both sides of the pair of clamp bands and tighten them on both sides, but in such a case, the mounting work becomes troublesome and parts are lost. It is easy and the above problem becomes remarkable. And other issues arise.

The present invention has been made in response to the above problems, and its object is to occupy and fix the abutting portions of the pipes with a small space and with a uniform tightening force. It is to provide a clamp joint that can

[0006]

According to the first clamp joint of the present invention as a means for achieving the above object, a plurality of clamp bands are formed with rib portions which overlap each other in the longitudinal direction of the pipe. The rib portions of the plurality of clamp bands are fastened from the longitudinal direction of the pipe.

Further, the second clamp joint of the present invention is the above-mentioned clamp joint, wherein the rib portion of the clamp band is formed with a polygonal tapered hole having a trapezoidal cross section, and the rib portions of the clamp band overlap each other. Each of the polygonal piece members is fitted in each of the tapered elongated holes of, and a bolt member is inserted into a through hole formed in each piece member, and both sides are formed by nut members screwed to both ends of the bolt member. The rib portions of the clamp bands that overlap each other are tightened by tightening the piece member from above. Further, in the third clamp joint of the present invention, in the clamp joint, the piece member is integrated with the head of the bolt member. It is configured to be formed.

[0008]

In the clamp joint of the present invention, the rib portions of the plurality of clamp bands are overlapped with each other in the longitudinal direction of the pipe, and the ribs of the clamp band that are overlapped with each other are tightened from the longitudinal direction of the pipe. Since there is no protruding part from, the occupied space becomes smaller,
Since it is tightened from the longitudinal direction of the pipe, the tightening force can be made uniform.

In addition, a polygonal taper elongated hole having a trapezoidal cross section is formed in the rib portion of the clamp band, and a polygonal piece member is fitted in each taper elongated hole of the rib portion of the clamp band which overlaps each other. The bolt member is inserted into the through hole formed in each piece member, and the rib members of the clamp bands that overlap each other are tightened by tightening the piece member from both sides with the nut members screwed to both ends of the bolt member. This ensures that the clamp band where the rib portions overlap can be tightened. further,
By integrally forming the piece member on the head of the bolt member,
Operates to reduce the number of parts.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Here, FIG. 1 to FIG.
1 shows an embodiment of the present invention, FIG. 1 is a side view, FIG. 2 is a partially sectional front view, FIG. 3 is an exploded perspective view of an essential part, FIG. 4 is a sectional view for explaining a tightening process, and FIG. FIG. 6 is a side view of the clamp band and a front view from the inside of the band.

The clamp joint of this embodiment is a clamp joint that clamps and connects the abutting portions of two pipes with a pair of clamp bands, and has a pair of clamp bands 1 and 1 in general. , A means 3 for tightening the rib portions 2, 2 of the pair of clamp bands 1, 1 overlapping each other.
It is configured to be tightened from the longitudinal direction of the pipe.

The pair of clamp bands 1 and 1 are formed with fitting grooves 1a on their inner peripheral surfaces, which can be fitted from the outside to the respective butting portions Wa and Wa of the ferrule portions W and W of the two pipes. , Rib portions 2 and 2 that overlap each other in the longitudinal direction of the pipe are formed at both ends, and each of the rib portions 2 and 2 of the pair of clamp bands 1 and 1 has a rectangular tapered long hole 4 having a trapezoidal cross section. 4 are formed in a direction in which they are converged on the overlapping surface side.

The tightening means 3 includes a bolt member 6 integrally formed with a square (usually square) piece member 5 having a trapezoidal cross section that can be fitted into the tapered long hole 4 of one clamp band 1. , A square piece member 7 having a trapezoidal cross section that can be fitted into the tapered elongated hole 4 of the other clamp band 1 in which a through hole 7a through which the bolt member 6 penetrates is formed.
And a nut member 8 and a washer member (including a spring washer) 9 screwed to the tip of the bolt member 6. Here, the gradient between the tapered elongated hole 4 and the bridge members 5 and 7 may be appropriately selected, but generally 20 to 30 degrees is preferable.

The operation of the clamp joint of this embodiment will be described. The rib portions 2 and 2 on one end side of the pair of clamp bands 1 and 1 are connected by the tightening means 3 and the two pipes are connected. After the abutting portions Wa, Wa of the ferrule portions W, W are abutted with each other via the gasket 10, the inner peripheral side fitting grooves 1a, 1a of the pair of clamp bands 1, 1 are connected to the ferrules of the two pipes. The ribs 2 and 2 on the other end side of the pair of clamp bands 1 and 1 are fitted in the outer peripheral portions of the abutting portions Wa and Wa of the portions W and W and are overlapped in the pipe longitudinal direction. At this time, as shown in FIG. 4, the clamp bands 1, 1 are arranged such that the centers of the tapered elongated holes 4, 4 of the rib portions 2, 2 on the other end side of the pair of clamp bands 1, 1 are slightly separated in the circumferential direction. To form.

Then, as shown in FIG. 4, the bolt member 6 is inserted from the taper elongated hole 4 side of the rib portion 2 of the one clamp band 1.
Is inserted into the tapered elongated hole 4 of the rib portion 2 of the other clamp band 1, and the piece member 7 is attached to the tip of the bolt member 6.
After fitting, the washer 9 is fitted to the tip of the bolt member 6 and the nut member 8 is screwed.

After that, by tightening the nut member 8, as shown in FIG.
A piece member 5 which is the head of the bolt member 6 is fitted in the tapered elongated hole 4 of the rib portion 2, and a piece member 7 is fitted in the tapered elongated hole 4 of the rib portion 2 of the other clamp band 1. The rib portions 2 of the pair of clamp bands 1 and 1 act so as to be tightened while being brought close to each other through the respective tapered elongated holes 4.

At this time, the tightening means 3 attached to the rib portions 2 and 2 on one end side of the pair of clamp bands 1 and 1 are also tightened in the same manner, but the clamp bands 1 and 1 are alternately tightened. It is preferable to make the tightening force at both ends as uniform as possible. Further, as described above, the tightening means 3 is attached in advance to the rib portions 2 and 2 on one end side of the pair of clamp bands 1 and 1, so that this serves as a rotary joint of the pair of clamp bands 1 and 1. Less parts are lost and tightening work becomes easier. Further, by integrally forming the piece member 5 as the head of the bolt member 6, the number of the nut member becomes one, and the workability is improved.

It should be noted that the present invention is not limited to the above-described embodiments, but includes configurations that can be modified and implemented within a range that does not change the gist of the present invention. Incidentally, in the above-mentioned embodiment, an example in which the piece member 5 having a trapezoidal cross section that can be fitted into the tapered elongated hole 4 of the one clamp band 1 is integrally formed as the head of the bolt member 6 is explained. The bolt member 6 may be a separate member, and the nut members 8 may be screwed and tightened at both ends of the bolt member 6. Further, in the above embodiment, an example using a pair of clamp bands has been described, but it is also possible to configure using three or more clamp bands, whereby the tightening points can be set to three or more, and more uniform. A strong tightening force can be obtained. Furthermore, although the rib portions are provided at both ends of the clamp band in the above embodiment, one end portion may be configured to be supported by a fixed shaft so as to be openable and closable.

[0019]

As is apparent from the above description, according to the clamp joint of claim 1 of the present invention, the rib portions of the plurality of clamp bands overlap each other in the longitudinal direction of the pipe,
Since the ribs of the overlapping clamp bands are tightened from the longitudinal direction of the pipe, the clamp band has no protruding portion from the outer peripheral surface and the exclusive space is reduced, and the clamp band is tightened from the longitudinal direction of the pipe with sufficient tightening force. In addition, it has an effect that it can be tightened with a uniform tightening force, and can be applied to low-pressure piping to high-pressure piping.

Further, according to the clamp joint of the second aspect of the present invention, the rib portion of the clamp band is formed with a polygonal tapered hole having a trapezoidal cross section, and the respective taper lengths of the rib portions of the clamp band overlapping each other. A polygonal piece member is fitted in each hole, and a bolt member is inserted into a through hole formed in each piece member, and the piece member is fastened from both sides with nut members screwed to both ends of the bolt member. As a result, the rib portions of the clamp bands that overlap each other are tightened, so that there is an effect that it is possible to securely tighten the clamp band that the rib portions overlap. Further, according to the clamp joint of claim 3 of the present invention, since the piece member is integrally formed on the head of the bolt member, the number of parts can be reduced and the tightening operation can be simplified.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view of FIG.

FIG. 3 is an exploded perspective view of a main part of FIG.

FIG. 4 is a cross-sectional view for explaining a tightening process.

FIG. 5 is a cross-sectional view after tightening.

FIG. 6 is a side view of the clamp band and a front view from the inside of the band.

FIG. 7 is a side view of a conventional clamp joint.

8 is a partial cross-sectional front view of FIG.

[Explanation of symbols]

1 ... Clamp band, 2 ... Rib part, 3 ... Tightening means, 4 ... Tapered hole, 5 ... Piece member, 6 ...
..Bolt member, 7 ... Piece member, 8 ... Nut member, W ... Pipe ferrule part, Wa ... Butt part

Claims (2)

(57) [Claims] 1. A clamp joint for connecting two pipes by fitting a plurality of clamp bands on the outer periphery of abutting portions of the two pipes and tightening rib portions of the plurality of clamp bands. Rib portions that overlap each other in the longitudinal direction of the pipe are formed on each side, and the rib portions of the plurality of clamp bands are configured to be tightened from the longitudinal direction of the pipe, and the rib portion of the clamp band has a trapezoidal cross section. A polygonal tapered long hole is formed, and a polygonal piece member is fitted in each tapered long hole of the rib portion of the clamp band that overlaps with each other, and a bolt member is inserted in the through hole formed in each piece member. The piece members are inserted and screwed to both ends of the bolt member, and the piece members are tightened from both sides to be overlapped with each other. Clamp joint, characterized in that the rib portion of the lamp band is tightened. 2. The clamp joint according to claim 1, wherein a piece member is integrally formed on the head of the bolt member.