JPH0725313U - Duct connection clip - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a structure of a duct connecting clip that reduces the influence of deformation stress received at the time of mounting and makes it easy to restore the original shape. [Construction] The duct connection clip 1 abuts the ducts with flange portions formed on the respective ducts, and connects between the engagement corner portions 5a and 5b fitted to the rising portions formed on the flange portions, respectively. The deformed corner portion 6 is formed with a smoothly curved curved surface having no corner portion in the cross section. If the deformation corner 6 is formed of a curved surface, the deformation stress applied when the duct connecting clip 1 is attached is not concentrated in one place, but becomes a force that elastically deforms the entire curved surface, and the restoring force also increases. . Therefore, even if the duct connecting clip 1 is made of a steel plate that has not been quenched, the restoring force against deformation during mounting is large and sufficient fastening can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a duct connecting clip used for connecting ducts, in which ducts having flange portions formed at their ends are butted against each other, and the flange portions are pressed together for fastening. Regarding connection clip.

[0002]

[Prior art]

 The ducts used for supplying and exhausting air are configured by connecting ducts of various sizes and shapes according to the conditions of the installation site. In order to connect the ducts to each other, instead of the connection method in which the ducts are butted against each other at the flanges formed at the ends of the ducts and the flanges are bolted together, a duct connection clip 33 as shown in FIG. In this method, both flanges are fastened and connected. As shown in FIG. 5, the ducts 30a and 30b are butted against each other at the flange portions 31a and 31b, and the duct connection clip 33 is engaged with the rising portions 32a and 32b formed around the respective flange portions 31a and 31b. Both ducts 30a and 30b are connected by being installed by being attached. The duct connecting clip 33 is formed by sheet metal working of a thin steel plate into a cross-sectional shape as shown in FIG. 4, and a plurality of duct connecting clips 33 are attached according to the length of one side of the duct. The operation of fitting the duct connecting clip 33 between the flange portions 31a and 31b is shown in order in FIG. This figure shows a partial cross section of the flange portions 31a and 31b in which the duct 30a and the duct 30b are butted. As shown in the drawing, the duct connecting clip 33 includes a pair of engaging corner portions 34a and 34b that engage with the rising portions 32a and 32b, respectively, and a deforming plate portion 35 that connects the engaging corner portions 34a and 34b. , And an arm portion 36 extending from one engagement corner portion 34b. Corners 35a are formed on the deformable plate portion 35, and the deformed plate portion 35 has a curved structure as a whole. Since the space between the inner surfaces of the engaging corner portions 34a and 34b is formed so as to match the facing width of both rising portions 32a and 32b of the abutted ducts 30a and 30b, the operation procedure as shown in FIG. When it is mounted between the rising portions 32a and 32b, the engaging corner portions 34a and 34b are fitted into the rising portions 32a and 32b, respectively, and the flange portions 31a and 31b connect the engaging corner portions 34a and 34b to each other as shown in FIG. 6 (d). Fasten the ducts 30a and 30b. At this time, the duct connecting clip 33 is temporarily deformed, and the flanges 31a and 31b are pressed against each other by the elastic force that causes the deformation to recover. By mounting the duct connecting clip 33 over the entire circumference of the flanges 31a and 31b at required intervals, both ducts 30a and 30b are connected.

[0003]

[Problems to be solved by the device]

 However, the duct connecting clip uses a steel plate that is not subjected to quenching treatment in order to reduce the cost, and stress concentrates on the corner portion 35a, so that deformation occurs by concentrating on the corner portion 35a. With the duct connecting clip 33, the deformation at the time of mounting is not restored, and as a result, the fastening force between both flanges is reduced and the clip moves. In the above deformation, when the arm portion 36 contacts one rising portion 32b in the state shown in FIG. 6 (c) and is pushed into the state shown in FIG. 6 (d), the force for expanding each bending angle portion is increased. In addition, the deformed plate portion 35 which receives the deforming stress most strongly appears most. For this reason, if mounting is performed with insufficient restoration, the force that fastens the two flanges will decrease. The phenomenon that the above-mentioned deformation is not sufficiently restored becomes prominent when a plurality of duct connection clips 33 are mounted on the same side of the flange. That is, if the next duct connecting clip 33 is attached next to the duct connecting clip that is attached first, the flange portion of the first duct connecting clip 33 that has been attached due to greater deformation will be lost. Appears as. The present invention was devised to solve the above-mentioned problems of the conventional duct connecting clip, and provides a structure of the duct connecting clip that reduces the influence of deformation stress received during mounting and facilitates restoration to the original shape. With the goal.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the means adopted by the present invention is to connect the ducts by abutting the flange portions respectively formed at the end portions of the duct, and to connect the ducts to each other, the longitudinal direction of the duct is In order to elastically engage the rising portion extending toward the upper end and press both flange portions against each other, a pair of engaging corner portions respectively engaged with the rising portion and the both engaging corner portions are formed. A duct connecting clip having at least a deforming plate portion to be connected, characterized in that the deforming plate portion is formed with a smoothly curved curved surface with no corners in a cross section. It is configured.

[0005]

[Action]

 In the duct connection clip according to the present invention, the deformed corners that connect between the engaging corners fitted to the rising portions of both flanges have a smoothly curved curved surface with no corners in the cross section. It is formed. If the above-mentioned deformation corner is formed by a curved surface, the deformation stress applied when the duct connection clip is attached does not concentrate in one place, but becomes a force that elastically deforms the entire curved surface, and the restoring force also increases. Therefore, even if the duct connecting clip is made of unquenched steel, the restoring force against deformation during mounting is large, and even when used in a large duct with a thick flange material, the flange A sufficient fastening force can be obtained even when a plurality of parts are mounted on the same side.

[0006]

【Example】

 Embodiments embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following embodiments are examples of embodying the present invention and do not limit the technical scope of the present invention. 1 is a perspective view showing the structure of a duct connecting clip according to an embodiment of the present invention, FIG. 2 is a perspective view showing a state of duct connection by the duct connecting clip, and FIG. 3 is an operation procedure of mounting on a duct. It is explanatory drawing which shows in order in a cross section. In FIG. 1, the duct connection clip 1 according to this embodiment is formed by bending a zinc-plated steel plate having a plate thickness of 1 mm and a width of 150 mm into a cross-sectional shape shown in the drawing. By this bending process, the pair of engaging corner portions 5a and 5b, the deforming plate portion 6 connecting the engaging corner portions 5a and 5b, and the arm portion extending from one engaging corner portion 5b. 7 and 7 are formed. The duct connecting clip 1 is used as a connecting tool when connecting the ducts 2a and 2b as shown in FIG. The ducts 2a and 2b are butted against each other at the flanges 3a and 3b formed at the ends of the ducts 2a and 2b, and the duct connection clip 1 is attached to the rising portions 4a and 4b formed around the flanges 3a and 3b. By fitting them, both ducts 2a and 2b are connected. When connecting ducts with this duct connection clip 1, a plurality of ducts are mounted at appropriate intervals so that no gap is created in the connecting portion in accordance with the length of each side of the duct. The operation procedure of mounting the duct connection clip 1 and the operation of each part will be shown in order in FIGS. As shown in FIG. 3 (a), one of the engaging corners 5 is engaged with the tip of one rising part 4a of both ducts 2a, 2b butted by the flange parts 3a, 3b. When the arm 7 is rotated about the fulcrum, the arm 7 comes into contact with the tip of the other rising portion 4b as shown in FIG. 3 (b). Further, by continuing the operation of rotating and pushing the duct connecting clip 1, as shown in FIG. 3 (c), the arm portion 7 is deformed to be spread outward, so that the engaging corner portion 5b is raised. It can be fitted into the portion 4b. At this time, since there is no corner portion where stress concentration occurs in the deforming plate portion 6, the deformation shown in FIG. 3C extends over the entire curved curved surface of the deforming plate portion 6 and is caused by the deformation of the entire curved surface. However, the deformation stress does not concentrate at one point, and even steel sheets that have not been quenched are restored to their original shape. Accordingly, while the arm portion 7 is in sliding contact with the rising portion 4b and undergoes deformation, the engagement corner portion 5b is fitted into the rising portion 4b as shown in FIG. In this case, the original shape is restored and both the engaging corner portions 5a and 5b engage with the rising portions 4a and 4b, so that the flange portions 3a and 3b can be pressed against each other.

As described above, the duct connecting clip 1 can be mounted due to the deformation at the time of mounting, and due to the restoration of the deformation, the two flanges are pressure-welded and the function of the duct connection is exerted. Since 7 is formed of a curved surface, this deformation restoration is sufficiently performed. In the conventional configuration, since the deforming plate portion 35 is formed by a straight line formed by bending one point of the corner 3a, the deformation due to the deformation stress concentrates at one point, so that there is a problem that the deformation cannot be restored sufficiently. In the example configuration, the deformable plate portion 7 was formed with a smoothly curved curved surface, which successfully solved the problem of the conventional configuration. Since the duct connecting clip 1 according to the present embodiment is excellent in deformation restoration as described above, even if a plurality of duct connecting clips 1 are mounted on the same side between the buttings of the flange portions 3a and 3b, the duct connecting clip which is mounted first is used. The fastening force of 1a does not decrease. That is, the duct connecting clip 1a, which is first mounted in a state where there is no pressure contact between the flange portions 3a and 3b and the resistance at the time of mounting is large, also receives a large degree of deformation stress. Therefore, if the restoring force is not sufficient, the first and second duct connecting clips 1a are mounted in such a state that they are less likely to receive the deformation stress after the flange portions 3a and 3b are pressed together. Fastening of the duct connecting clips 1b and 1c causes a decrease in fastening force of the duct connecting clip 1a that is first mounted. However, since the duct connecting clip 1 according to the present embodiment has a large deformation restoring force, there is more than one side. Even when mounting individual pieces, the fastening force does not decrease.

[0008]

[Effect of device]

 As described above, in the duct connecting clip according to the present invention, the deformed corner portion that connects between the engagement corner portions that are fitted to the rising portions of both flange portions is the corner portion of the cross section. Not formed with a smoothly curved curved surface. When the above-mentioned deformation corner is formed by a curved surface, the deformation stress applied when the duct connecting clip is attached is not concentrated in one place, but becomes a force that elastically deforms the entire curved surface, and the restoring force also increases. Therefore, even if the duct connecting clip is made of a non-quenched steel plate, the restoring force against deformation during mounting is large, and even when used in a large duct with a thick flange portion, the flange Sufficient tightening can be obtained even when multiple parts are mounted on the same side.

[Brief description of drawings]

FIG. 1 is a perspective view of a duct connection clip according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state of duct connection by the duct connection clip according to the embodiment.

FIG. 3 is an explanatory diagram for sequentially explaining a procedure of a mounting operation of the duct connecting clip according to the embodiment.

FIG. 4 is a perspective view of a duct connection clip according to a conventional example.

FIG. 5 is a perspective view showing a state of duct connection by a duct connection clip according to a conventional example.

FIG. 6 is an explanatory view showing a procedure of a mounting operation of the duct connecting clip according to the conventional example in order.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Duct connection clip 2a, 2b ... Duct 3a, 3b ... Flange part 4a, 4b ... Rising part 5a, 5b ... Engaging corner part 6 ... Deformation plate part 7 ... Arm part

Claims (1)

[Scope of utility model registration request] 1. In order to connect the ducts by abutting the flange portions formed respectively at the end portions of the ducts, elastically is provided at a rising portion extending in the longitudinal direction of the duct at the peripheral portion of the flange portions. At least a pair of engaging corner portions that respectively engage with the rising portion and a deforming plate portion that connects the both engaging corner portions so that both flange portions are pressed against each other. The duct connecting clip, wherein the deformable plate portion is formed with a smoothly curved curved surface having no corners in a cross section.