JP3217571U - Housing type pipe fitting - Google Patents

Abstract

The present invention provides a housing-type pipe joint that prevents a fastening bolt passing through a housing from the lower side from dropping and allows a single person to easily connect a pipe. An annular gasket 10 into which an end portion of a pipe to be connected is inserted, two divided housings 11 and 12 covering the outer peripheral surface thereof, and flanges formed on both sides of the two divided housings. A housing type pipe joint comprising a pair of left and right fastening bolts 19 and 20 inserted between 15 and 16. An annular elastic material 21 such as an O-ring was attached to the shaft portion between the head of one or both of the fastening bolts 19 and 20 and the external thread portion to prevent the falling off. [Selection] Figure 7

Description

  The present invention relates to a housing type pipe joint used for connecting pipes having a relatively large diameter.

  Conventionally, in order to connect steel pipes and stainless steel pipes having a diameter of 25 A or more used for fire fighting pipes, water and sewage pipes, plant pipes, etc., housing type pipe joints have been used.

  As shown in Patent Document 1, this housing-type pipe joint includes an annular gasket into which an end of a pipe to be connected is inserted, and a housing divided into two covering the outer peripheral surface thereof. is there. Insert the end of the pipe into the annular gasket from both sides, and tighten the flange formed on both sides of the housing divided into two with a pair of fastening bolts, so that the gasket adheres to the outer peripheral surface of the pipe, The pipes can be connected to each other in a sealed state.

  When the pipe to be connected using this housing-type pipe joint is horizontal and the housing divided into two parts is to be attached to the outer surface of the pipe from above and below, the fastening bolt should be lowered with its head down. In many cases, the nut is passed from the side through the bolt hole of the flange and tightened from the upper side. This is because it is difficult to pass the fastening bolt from the upper side through the bolt hole of the flange and fasten the nut on the lower side of the pipe.

  At this time, while the operator supports the lower housing with one hand, the nut is screwed into the male screw portion of the fastening bolt with the other hand, but the left and right fastening bolts together with the housing are not dropped with one hand. It is not easy to support. In particular, when the diameter of the pipe increases, the housing becomes large and the distance between the two fastening bolts also increases. Therefore, even if the hand is spread out, it does not reach, and the fastening bolt on one side tends to fall off. For this reason, it was not easy to connect the pipes alone.

  Therefore, Patent Document 2 proposes a housing-type pipe joint having a structure in which an H-shaped connecting pin is used instead of a fastening bolt on one side. With this structure, only one fastening bolt needs to be fastened, so that the pipe can be connected by one person.

  However, since this structure requires an H-shaped connecting pin in addition to a normal fastening bolt and nut, there is a problem that the number of parts increases and the manufacturing cost increases. Further, the side connected by the H-shaped connecting pin cannot be tightened, and is fastened by only one fastening bolt arranged on the opposite side, so that there is a problem that the housing cannot be tightened evenly on the left and right. It was.

JP-A-7-190261 JP 2004-204986 A

  Accordingly, an object of the present invention is to solve the above-mentioned conventional problems, and to provide a housing-type pipe joint that can prevent a fastening bolt passed through the housing from dropping from the lower side and can easily perform pipe connection work alone. That is.

  The present invention made in order to solve the above problems includes an annular gasket into which an end portion of a pipe to be connected is inserted, a housing divided into two parts covering its outer peripheral surface, and a housing made up of these two parts. In a housing-type pipe joint consisting of a pair of left and right fastening bolts inserted between flanges formed on both sides, an annular elastic material is attached to the shaft between the head of one or both fastening bolts and the external thread It is characterized by that.

  As in claim 2, it is preferable that the annular elastic material is an O-ring. Moreover, it is preferable that the annular elastic material is a plurality of O-rings.

  The housing-type pipe joint of the present invention is such that an annular elastic material is attached to the shaft portion between the head portion of one or both fastening bolts and the male screw portion. Thus, even when the housing is inserted upward into the bolt hole of the housing, the annular elastic material is caught in the bolt hole, and the fastening bolt is prevented from dropping downward. For this reason, the worker only needs to support the fastening bolt on one side, and one person can easily connect the pipes.

  The annular elastic material needs to pass through the male screw portion of the fastening bolt and be fitted into the shaft portion. However, if the annular elastic material is used, the male screw portion of the fastening bolt can be passed therethrough. If the annular elastic material is tubular, it is difficult to pass the threaded portion of the fastening bolt. However, if the annular elastic material is an O-ring, the threaded portion of the fastening bolt can be easily passed through and fitted. it can. Moreover, since the O-ring is a general-purpose product and can be obtained at a low cost, there is an advantage that an increase in cost can be suppressed.

1 is a front view showing a first embodiment of the present invention. 1 is a side view showing a first embodiment of the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a front view which shows the 2nd Embodiment of this invention. It is a center longitudinal cross-sectional view which shows the 2nd Embodiment of this invention. It is a front view which shows the state in the middle of piping. It is a center longitudinal cross-sectional view which shows the 3rd Embodiment of this invention.

Embodiments of the present invention will be described below.
FIG. 1 is a front view showing a first embodiment of the present invention, and FIG. 2 is a side view thereof. 3 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line BB in FIG.

  In these drawings, 10 is an annular gasket, and 11 and 12 are two-divided housings covering the outer peripheral surface. The annular gasket 10 is a rubber member in which end portions of pipes to be connected are inserted from both sides. In this embodiment, as shown in FIG. 3, the annular gasket 10 has a self-seal type whose cross section is improved in sealing performance by internal pressure, but is not limited thereto.

  The outer peripheral surface of the annular gasket 10 is covered with housings 11 and 12 divided into two. These housings 11 and 12 are made of a casting, and as shown in FIG. 3, arc-shaped recesses for accommodating the annular gasket 10 are formed on the inner surfaces thereof. The housings 11 and 12 are provided with semicircular openings for inserting the tubes, and end portions thereof are provided with semicircular convex portions 13 and 14 for engaging the concave portions formed in the tubes and holding the tubes. ing.

  These housings 11 and 12 are provided with flanges 15 and 16 projecting from left and right, respectively, and bolt holes 17 and 18 are formed in the flanges 15 and 16, respectively. The housings 11 and 12 are fastened to each other by fastening the nuts 22 and 23 through the fastening bolts 19 and 20 to the bolt holes 17 and 18, respectively, and the pipes are connected to each other as in the conventional case.

  The above structure is the same as this type of conventional housing-type pipe joint, but in the housing-type pipe joint of the present invention, the shaft part between the head of one or both fastening bolts 19 and 20 and the male thread part is provided. The annular elastic material 21 is attached. The annular elastic member 21 is preferably an O-ring. In the first embodiment, the O-rings are attached to both the fastening bolts 19 and 20, respectively.

  The O-ring is attached to the shaft portion through the male screw portions of the fastening bolts 19 and 20, and the inner diameter size of the O-ring needs to be able to be tightly held on the shaft portion. The outer diameter size is set larger than the inner diameter of the bolt holes 17 and 18. Since the O-ring is elastic, it can be easily fitted through the threaded portion of the fastening bolt, and is advantageous in that it is a general-purpose product and is inexpensive.

  In the first embodiment described above, the O-rings are attached to both the fastening bolts 19 and 20, respectively. However, as in the second embodiment shown in FIG. It is also possible to attach an O-ring. Also, a plurality of O-rings can be provided as in the third embodiment shown in FIG. As a result, the frictional force can be increased and the fastening bolt can be more reliably prevented from falling off.

  As described above, when the pipe to be connected using such a housing-type pipe joint is horizontal and the housings 11 and 12 divided into two parts are to be attached to the outer surface of the pipe from above and below, it is illustrated. Thus, the fastening bolts 19 and 20 are often passed from the lower side to the bolt holes 17 and 18 of the flanges 15 and 16 with their heads down, and the nuts 22 and 23 are fastened from the upper side.

  During this operation, it is not easy for one person to prevent the two fastening bolts 19 and 20 with their heads from being dropped simultaneously. However, in the housing type pipe joint of the present invention, the annular elastic material 21 is attached to the shaft portion between the head portion of the one or both fastening bolts 19 and 20 and the external thread portion. The elastic material 21 is caught in the bolt holes 17 and 18, and the fastening bolts 19 and 20 can be prevented from falling off. For this reason, as shown in FIG. 7, the nut 22 is first attached to the fastening bolt 19 on one side and then the nut 23 is attached to the other fastening bolt 20 by one person.

  Note that if the O-rings are attached to both the fastening bolts 19 and 20 as in the first embodiment, the fastening bolts 19 and 20 are not likely to fall off, so the order of fastening the nuts is arbitrary. However, when the O-ring is attached to only one fastening bolt 20 as in the second embodiment, the nut is first supported while supporting the head of the fastening bolt 19 not attached with the O-ring with one hand. 22 will be attached.

  As described above, the housing-type pipe joint according to the present invention prevents the fastening bolts 19 and 20 passed from the lower sides of the flanges 15 and 16 of the housings 11 and 12 from being dropped, so that one person can easily connect the pipes. Is something that can be done.

DESCRIPTION OF SYMBOLS 10 Annular gasket 11 Housing 12 Housing 13 Semicircular convex part 14 Semicircular convex part 15 Flange 16 Flange 17 Bolt hole 18 Bolt hole 19 Fastening bolt 20 Fastening bolt 21 Annular elastic material 22 Nut 23 Nut

Claims (3)

An annular gasket into which the end of the pipe to be connected is inserted, a housing divided into two covering the outer peripheral surface thereof, and a pair of left and right inserted between flanges formed on both sides of these two divided housings In housing-type pipe joints consisting of fastening bolts,
A housing-type pipe joint, characterized in that an annular elastic material is attached to a shaft portion between the head portion and the external thread portion of one or both fastening bolts.   The housing-type pipe joint according to claim 1, wherein the annular elastic member is an O-ring.   The housing-type pipe joint according to claim 1, wherein the annular elastic member is a plurality of O-rings.

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