JPH0583578U - Duct fittings - Google Patents

Abstract

(57) [Summary] [Purpose] The work of connecting ducts for ducts will be saved and workability will be improved. A first flange 21 attached to the end of the duct base pipe 10A and having a female screw hole 21a, and a bolt insertion hole corresponding to the female screw hole 21a attached to the end of the duct base pipe 10B. The bolt 23 has a second flange 22 having an opening 22a, a shaft 231 screwed into the female screw hole 21a through the bolt insertion hole 22a, and a head 232 that interferes with the bolt insertion hole 22a. Head 232 has a conical shape whose diameter decreases toward the side opposite to shaft 231 and is divided in the circumferential direction by slit 233.
The head 232 can be locked by being press-fitted into the bolt insertion hole 22a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a joint for connecting air-conditioning ducts arranged in a space behind a building to each other.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 4, in an air conditioning duct in which a plurality of duct base pipes are connected, a joint 120 connecting the duct base pipes 110 to each other is provided at opposite ends of the single pipes 110, 110. The steel flanges 121, 121 attached respectively, the bolt 122 and the nut 123 for fastening and connecting them, and the packing interposed between the facing surfaces of the flanges 121, 121 in order to maintain the airtightness of the joint 120. It is composed of 1 24.

[0003]

[Problems to be solved by the device]

 However, according to the above configuration, the flanges 121 and 121 are positioned so that the respective bolt insertion holes 121a and 121a overlap each other, and the bolts 122 are inserted into the arbitrary bolt insertion holes 121a and 121a and temporarily fixed. After that, the bolts 122 are similarly inserted into the other bolt insertion holes, temporarily fixed, and tightened sequentially by the nuts 123, respectively. Therefore, this work requires 2-3 workers. Was needed.

The present invention has been made under the circumstances as described above, and its technical problem is to improve the joint structure to save the labor of duct pipe connection work and to improve workability. It is to improve.

[0005]

[Means for Solving the Problems]

 The above technical problems can be effectively solved by the present invention. That is, the duct joint according to the present invention includes a first flange that is attached to the end of the duct tube and has a required number of female screw holes, and a duct tube that faces the first flange. A second flange that is attached to the end portion and has a required number of bolt insertion holes corresponding to the female screw holes, and a shaft portion that is screwed into the female screw holes through the bolt insertion holes and the head Has a bolt that interferes with the bolt insertion hole, and the head of the bolt has a conical shape with a smaller diameter toward the side opposite to the shaft, and is divided in the circumferential direction by a slit, and It is configured to allow displacement.

[0006]

[Action]

 According to the duct joint configured as described above, when connecting the bolts, the bolts are screwed into the female screw holes of the first flange of the duct element pipe in advance so that the heads of the bolts project appropriately outward. In this state, the first flange and the second flange of the other duct material tube are pressed in the directions in which they approach each other. Then, the head of the bolt divided by the slit passes through the bolt insertion hole while being displaced in the diameter reducing direction by the conical outer surface of the bolt contacting the inner surface of the bolt insertion hole in the second flange. Then, when the bolt has completely passed, the head of the bolt returns to its original shape and interferes with the bolt insertion hole, so that the second flange and the first flange are locked to each other. After that, if necessary, a screw driver can be engaged with the slit to tighten the screw.

[0007]

【Example】

 FIG. 1 shows an embodiment of a duct joint according to the present invention together with a duct pipe to be connected, that is, 10A and 10B are duct pipes to be connected to each other. The joint 20 connecting the duct base pipes 10A and 10B faces a first steel flange 21 fixed to the end of one duct base pipe 10A, and the first flange 21. A second steel flange 22 fixed to the end of the other duct blank 10B, a bolt 23 for restraining the flanges 21 and 22 with each other, and a packing 24 interposed between the flanges 21 and 22. Is included.

The first flange 21 is provided with a required number of female screw holes 21 a to be screwed with the shaft portion 231 of the bolt 23 at appropriate intervals, and the second flange 22 is provided with the female screw holes. Corresponding to 21a, the shaft portion 231 of the bolt 23 can be inserted, and a required number of elongated bolt insertion holes 22a that interfere with the head portion 232 are formed. The packing 24 also has a bolt insertion hole 24a corresponding to the bolt insertion hole 22a.

The outer peripheral surface 232 a of the head portion 232 of the bolt 23 has a conical surface whose diameter decreases toward the side opposite to the shaft portion 231, and a typical shape is formed from the head portion 232 to the middle of the shaft portion 231. Is divided into four in the circumferential direction by slits 233 intersecting in a cross shape, which allows elastic displacement in the radial direction. Also, the outermost diameter of the head 232, the width of the slit 233, and the bolt insertion so that the head 232 of the bolt 23 can be passed through the bolt insertion hole 22a by diametrically displacing the head 232 by the amount of the divided gap by the slit 233. The short diameter of the hole 22a is set appropriately.

In addition, in FIG. 1, the second flange 22 or the first flange 21 is also provided at the not-shown right end of the duct tube 10 A and the not-shown left end of the duct tube 10 B. Needless to say, it is preferable to attach the first flange 21 to one end of the duct tube and the second flange 22 to the other end. Further, the reason why the bolt insertion hole 22a is formed in a long hole shape is that the head portion 232 of the bolt 23 can be easily positioned with respect to the insertion hole 22a.

In the duct joint 20 of the present embodiment having the above-described configuration, at the time of duct connection work, the bolt 23 is attached to each female screw hole 21a of the first flange 21 fixed to the duct base pipe 10A. The head 232 is screwed in such that it appropriately protrudes toward the duct base pipe 10B of the connection partner. Then, when the first flange 21 of the duct tube 10A and the second flange 22 fixed to the other duct tube 10B are pressed in the directions in which they are close to each other, the cross-shaped slit 233 divides them into four in the circumferential direction. The head 232 of the bolt 23 is displaced in the diameter-reducing direction when its conical outer peripheral surface 232a is in pressure contact with the inner surface of the bolt insertion hole 22a in the second flange 22, and slides through this bolt insertion hole 22a. While passing. Then, when completely passed, as shown in the perspective view of FIG. 2, the reduced diameter head 232 returns to its original shape so as to snap into a snap shape, and the outer edge of the bolt insertion hole 22a is removed. Since they interfere with each other, the second flange 22 and the first flange 21 are locked with each other.

In the locked state of FIG. 2 in which the head 232 of the bolt 23 is just press-fitted into the bolt insertion hole 22a, the packing 24 is not sandwiched between the flanges 21 and 22 and the flanges 21 , 22 may rattle, but in this case, if necessary, a plus (cross) driver 30 can be engaged with the cross-shaped slit 233 of the head portion 232 for further tightening. Further, at this time, the head 23 is expanded and deformed by inserting the tip of the driver 30 into the cross-shaped slit 233, so that the engagement surface with the outer edge of the bolt insertion hole 22a increases and tightens securely. You can

FIG. 3 conceptually shows an actual duct connection work by the duct joint 20 of the present embodiment. That is, below the slab 1, there is the duct base pipe 10B previously attached via the suspension bolt 2 and the support fitting 3, and it is vertically movable with respect to the second flange 22 of the duct base pipe 10B. One operator on the vehicle 4 connects the first flange 21 of the duct tube 10A lifted by the construction vehicle 4 having a support base. As described above, the head 232 of the bolt 23 previously arranged in each female screw hole 21a of the first flange 21 is attached to the bolt insertion hole 22a of the second flange 22 of the duct pipe 10B of the connection partner. Since it can be easily locked by simply fitting it in, it is possible for even a single worker to perform duct connection work.

[0014]

[Effect of the device]

 As described above, according to the duct joint of the present invention, the bolt is provided in advance in the female screw hole of the first flange so as to project appropriately, and the head of the bolt is attached to the second flange of the other duct raw pipe. Since the pair of opposing duct blanks can be easily locked by simply fitting them into the bolt insertion holes of, the single worker can quickly perform duct connection work. Labor saving and improvement of workability can be achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a duct joint according to the present invention together with a duct tube to be connected.

FIG. 2 is a perspective view showing a duct connection state by the duct joint of the present embodiment.

FIG. 3 is an explanatory view conceptually showing the connection work by the duct joint of the present embodiment.

FIG. 4 is a cross-sectional view of a connected state showing an example of a conventional duct joint together with a duct pipe for connection.

[Explanation of symbols]

 10A, 10B Duct pipe 20 Duct joint 21 First flange 21a Female screw hole 22 Second flange 22a Bolt insertion hole 23 Bolt 231 Shaft 232 Head 232a Outer peripheral surface 233 Cross-shaped slit

Claims (1)

[Scope of utility model registration request] 1. A first flange attached to an end of a duct raw pipe and having a required number of female screw holes formed therein, and attached to an end of the duct raw pipe facing the first flange. And a second flange in which a required number of bolt insertion holes corresponding to the female screw holes are opened, the shaft portion is screwed into the female screw holes through the bolt insertion holes, and the head portion interferes with the bolt insertion holes. Characterized in that the head of the bolt forms a conical surface having a smaller diameter toward the side opposite to the shaft, and is divided in the circumferential direction by a slit so that displacement in the radial direction is allowed. And duct joints.