JP3149467U - Duct connection device - Google Patents

Abstract

Provided is a duct connecting device capable of connecting ducts quickly and reliably by a simple operation. A tool engaging portion 1b formed on a head 1a of a band take-up shaft 1 for winding and tightening a band B, and a duct connecting portion A1 and the band B are screwed in at a predetermined interval in the circumferential direction. By unifying the tool engagement portions D2 formed on the heads D1 of the plurality of screws D into the same size and shape, the tool engagement portions 1b of the band winding shaft 1 and the tool engagement of the screws D The band B can be tightened and screwed with a single tool engaged with the joint D2. [Selection] Figure 1

Description

  The present invention relates to a duct connecting device for fastening and fixing ends of ducts such as round ducts and flexible ducts used as air conditioning piping for buildings with a flexible bunt.

  Conventionally, as this type of connection device, upright walls are integrally installed on both sides of a rectangular substrate, and a bolt having a split groove is inserted into a circular hole provided in these upright walls, and a left screw portion at one end thereof Is screwed to the nut via a seat plate, and one end of the flexible metal band is fixed to the elongated band groove provided at the tip of the substrate and surrounded by a hose or the like, and then the other end of the band is bolted to There is a hose fastener that is inserted into the split groove and the bolt head is rotated to tension the metal band (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 40-16807 (page 1, Fig. 1-2)

In such a conventional connecting device, one duct superposed on the outside is reduced in diameter by tightening the band, and is pressed and fixed to the other duct.
However, when a duct made of a deformable material is superimposed on the outside of a duct made of a rigid material that cannot be deformed, the deformable duct expands and contracts due to changes in its internal pressure. There was a problem that there was a risk of falling out of the impossible duct and developing into an accident.
Therefore, in order to solve this problem, for example, it is conceivable to prevent the duct from coming off by screwing a screw into the overlapped portion of the band and the duct connecting portion in the circumferential direction at appropriate intervals.
However, in this case, the band tightening bolt is rotated by a spanner and tightened, and then a plurality of screws are screwed into the band with a screwdriver, and the screws are fastened. Therefore, there is a problem that the tool has to be changed, and the work becomes complicated by that amount, and the work is extremely difficult to perform especially at a high place such as the ceiling, and it takes time for the connection work.
In addition, since the bolts are inserted into the upright wall and fixed with the nuts, they are attached integrally, so that there is a problem that the number of parts increases by the amount of the nuts and the cost increases.
Furthermore, since the other end on the winding end side of the band is directly inserted into the split groove of the bolt and wound, when the band is wound once around the hose or the like, it is between the other end on the winding end side of the band and the hose or the like. There was also a problem that a gap was formed and the two could not be brought into close contact with each other, and there was a risk that this portion would be poorly tightened.

  The present invention has been made in view of the above-described conventional circumstances, and an object of the present invention is to provide a duct connecting device capable of quickly and reliably connecting ducts with a simple operation.

In order to achieve the above-mentioned object, the present invention is a band in which a band wound around the outer periphery of a connecting portion where a plurality of ducts are overlapped and a band winding shaft for winding and tightening the band are rotatably provided. A tool engaging portion formed on a head of the band winding shaft; and a plurality of screws screwed at predetermined intervals in the circumferential direction across the connecting portion of the duct and the band. The tool engaging portions formed on the heads of each are unified with the same size and the same shape.
Further, the band fastener has the band winding shaft and a frame body in which a pair of support pieces are formed in a U shape with a seat plate interposed therebetween, and a bearing hole opened in these support pieces. The band winding shaft is rotatably inserted, and the head of the band winding shaft protruding from the bearing hole is made larger than the inner diameter of the bearing hole, and at the tip opposite to the head, A configuration in which a pressure-deformed retaining portion is formed is added.
In addition, a locking hole in which one end portion on the winding start side of the band is locked and a through hole through which the other end portion on the winding end side of the band passes are formed in the seat plate of the frame body. The other end portion on the winding end side of the band penetrating the through hole is configured to be arranged to be wound around the band winding shaft.

The present invention includes a tool engaging portion formed on the head of a band take-up shaft that winds and tightens the band, and a plurality of screw heads screwed at predetermined intervals in the circumferential direction across the duct connecting portion and the band. By unifying the tool engaging portions formed in the same size and shape, the tool engaging portion of the band winding shaft and the tool engaging portion of the screw can be engaged with a single tool. Can be tightened and screwed.
Therefore, the ducts can be connected quickly and reliably by a simple operation.
As a result, compared to the conventional one that is connected only by tightening the band, at least one of the ducts is safe even if it expands or contracts due to fluctuations in internal pressure.
In addition, since there is no need to change tools during the work, installation work is easy even in high places such as the back of the ceiling, the time required for connection work can be greatly shortened, and many duct connection work can be performed efficiently. it can.

Further, the band take-up shaft is rotatably inserted over the bearing hole opened in the support piece of the band fastener, and the head of the band take-up shaft protruding from the bearing hole is made larger than the inner diameter of the bearing hole. At the same time, by forming a pressure-deformed retaining portion at the tip opposite to the head, the band take-up shaft is rotatably supported and the movement in the axial direction is restricted.
Therefore, the support structure of the band winding shaft 1 can be simplified.
As a result, the band winding shaft is prevented from coming off in the axial direction without a nut or other fastening parts, and the number of parts is reduced by that amount, compared to the conventional type that uses nuts to fasten the bolts inserted through the upright wall. Can be achieved.

In addition, a locking hole for locking one end of the band at the winding start side and a through hole through which the other end of the band at the winding end side passes are opened in the seat plate of the frame, and the through hole is penetrated. By arranging the other end on the winding end side of the wound band to be wound around the band winding shaft, the band winding shaft can be directly connected without penetrating the other end on the band winding end side through the through hole. The contact area between the band and the connecting portion of the duct is increased as compared with the case where the wire is wound around.
Therefore, the adhesiveness between the band and the duct connecting portion can be improved.
As a result, it is possible to surely prevent poor tightening as compared with the conventional one in which the other end on the winding end side of the band is directly inserted into the split groove of the bolt and wound.

It is explanatory drawing which shows one Example of the duct connection apparatus of this invention, (a) is a longitudinal front view which shows the preparatory process of band fastening, (b) is the same expansion cross-sectional plan view of a band fastener. It is the same part expansion perspective view. It is an enlarged vertical front view which shows the state after band fastening. It is a partially expanded perspective view which shows the other Example of the duct connection apparatus of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 4, the embodiment of the duct connecting device of the present invention includes a band B wound around the outer periphery of a connecting portion A <b> 1 in which a plurality of ducts A and A ′ are overlapped, and this band B. A band tightening tool C in which a band take-up shaft 1 to be wound and tightened is rotatably provided, and a plurality of screws D screwed at predetermined intervals in the circumferential direction over the connecting portions A1 and the bands B of the ducts A and A ′. The tool engaging portion 1b formed on the head portion 1a of the band winding shaft 1 and the tool engaging portion D2 formed on the head portion D1 of the screw D are unified to have the same size and shape. Yes.

One duct A is, for example, a round duct or a square duct made of a rigid material such as a metal, and the other duct A ′ is a deformation in which a reinforcing wire, a nonwoven fabric, or a synthetic resin core is wound and covered with a noncombustible material. It is a flexible duct made of a possible material, and the end of one duct A is covered with the end of the other duct A ′ over the entire circumference, and the overlapping portion is used as a connection portion A1.
Before the band B described later is wound around the outer periphery of the duct connecting portion A1, an adhesive tape (not shown) made of a non-combustible material or the like is wound around the ends of both the ducts A and A 'as necessary. Is preferably temporarily fixed so that the position cannot be displaced.

  The band B is formed by forming a flexible material such as steel or stainless steel into a thin band plate shape, and mainly uses a belt without holes as in the illustrated example, but instead, a hole is formed at predetermined intervals. It is also possible to use a perforated belt with a gap.

  The band fastener C includes a band winding shaft 1 having a band locking means 1c for locking with the band B, and a frame body in which a pair of support pieces 2a are formed in a substantially parallel U shape with a seat plate 2b interposed therebetween. 2 and the band take-up shaft 1 is rotatably inserted through a bearing hole 2c opened in the support piece 2a.

The band take-up shaft 1 is a rigid body such as metal or synthetic resin, and is formed longer than the interval between both support pieces 2a of the frame 2 described later. A head engaging portion 1b formed at one end is provided with a tool engaging portion 1b. “+” Is preferred.
Further, the band take-up shaft 1 is formed with a band locking means 1c at an intermediate position in the axial direction, and both end portions in the axial direction are inserted into bearing holes 2c of both support pieces 2a of the frame body 2 to be described later, 1a and a retaining portion 1d formed at the other end are locked in the axial direction with respect to the peripheral portion of each bearing hole 2c, thereby being supported so as to be rotatable and to restrict movement in the axial direction. ing.

  The frame body 2 is formed in a U shape by punching a plate made of a rigid body such as metal into a predetermined shape and bending the pair of support pieces 2a in the same direction across the seat plate 2b at a substantially right angle, Alternatively, the support piece 2a is integrally formed with a synthetic resin in a U-shape, and a bearing hole 2c through which the band winding shaft 1 is inserted is formed in a straight line.

Further, a detent means (not shown) is provided between the bearing hole 2c and the band winding shaft 1 so as to engage with the direction of the band winding rotation of the band winding shaft 1 if necessary. It is preferable to provide it.
Further, at least one of the pair of bearing holes 2c opened in both the support pieces 2a has a larger diameter than the insertion portion 1e of the band take-up shaft 1, so that the band take-up with respect to both the support pieces 2a is performed. It is preferable that the shaft 1 can be tilted.

  The seat plate 2b is provided with a locking hole 2d larger than the cross-sectional shape of the band B so that at least one end B1 on the winding start side of the band B is locked.

The screw D is a commercial product with no special processing, and it is preferable that the tool engaging portion D2 formed on the head D1 be “+”.
Further, it is preferable to use a screw with a drill that has a threaded tip formed in the threaded portion and can be directly screwed into the connecting portion A1 between the ducts A and A ′ without a pilot hole.
Each embodiment of the present invention will be described below.

  In the first embodiment, as shown in FIGS. 1A and 1B to FIG. 3, the end of the flexible duct is covered as the other duct A ′ on the outside of the end of the round duct as the one duct A, An adhesive tape (not shown) is wound around the outer periphery of the duct connection portion A1 and temporarily fixed, and then the band B is wound along the outer side thereof, and the band B is tightened by rotating the band winding shaft 1 of the band fastener C This shows the case where the diameter is reduced.

  The band winding shaft 1 is provided with a band insertion hole larger than the cross-sectional shape of the band B as the band locking means 1c at the intermediate position in the axial direction, and the outer diameter of the head 1a is made larger than the inner diameter of the bearing hole 2b. In addition, by forming a retaining portion 1d that is pressure-deformed by pressing or the like at the tip on the opposite side, movement of the band winding shaft 1 in the axial direction is restricted.

In the example of illustration, the support piece 2a of the frame 2 is formed in the front substantially semicircle shape.
Further, an intermediate position in the axial direction of the band winding shaft 1 is pressed to be deformed into a flat plate shape, and a band insertion hole of the band locking means 1c is opened in the flat portion.
Further, after the band locking means 1c is inserted into the bearing hole 2c of the frame body 2, the retaining portion 1d protruding from the support piece 2a to the outside of the frame body 2 intersects the flat direction of the band locking means 1c. Pressed in the direction to deform into a flat plate.
As another example, the band locking means 1c and the retaining portion 1d can be pressed into the same direction and deformed into a flat plate shape.

A through hole through which the other end B2 on the winding end side of the band B penetrates the seat plate 2b of the frame 2 is separate from the locking hole 2d on which the one end B1 on the winding start side of the band B is locked. 2e, and the other end B2 on the winding end side of the band B is passed through the through hole 2e from the duct side surface of the seat plate 2b, and then the band locking of the band winding shaft 1 is performed. The arrangement is such that it is drawn out toward the means 1c, inserted through the band insertion hole and wound up.
As another example, the locking holes 2d and the through holes 2e can be connected to form one hole.

  Further, if necessary, one end or both ends of the seat plate 2b are bent to integrally form a reinforcing piece 2f that enters between the two supporting pieces 2a, thereby preventing the two supporting pieces 2a from being bent and deformed inward. It is also possible.

Next, a method of connecting the ducts A and A ′ using such a duct connecting device and the function and effect thereof will be described.
First, as a preparatory work before the band is wound, one end B1 on the winding start side of the band B is bent and opened on the seat plate 2b of the frame 2 as shown by the one-dot chain line in FIGS. The latched hole 2d is locked so that it cannot be removed by hooking or the like.
Thereafter, the band B is wound along the outer periphery of the connection portion A1 between the end portion of the round duct A and the end portion of the flexible duct A ′, and the other end portion B2 on the winding end side is connected to the duct side of the seat plate 2b. While penetrating from the surface into the through hole 2 e, the band is inserted into a band insertion hole which is the band locking means 1 c of the band winding shaft 1.

  In a state where this preparatory work is completed, the operator engages the driver with the tool engaging portion 1b of the band winding shaft 1, and, for example, in the direction of the arrow indicated by the two-dot chain line in FIG. 1 (a) and FIG. When rotated, the band B is wound around the outer periphery of the band winding shaft 1 as shown in FIG.

  At this time, when at least one of the bearing holes 2c has a larger diameter than the insertion portion 1e of the band winding shaft 1 and the band winding shaft 1 can be tilted, the duct connecting portion A1 Even if the direction of the band B wound around the outer periphery is not orthogonal to the axial direction of the band winding shaft 1, the band winding shaft 1 can be moved by being inclined and wound.

  As a result, the end portions of the ducts A and A ′ are in close contact with each other in the duct connection portion A1, but if one of them is a deformable duct such as the flexible duct A ′, it is flexible in accordance with a change in internal pressure generated during use. There is a possibility that the duct A 'expands and contracts and comes off from the end of the round duct A that cannot be deformed.

Therefore, as shown in FIG. 3, a plurality of screws D are screwed into the overlapping portion of the band B and the duct connection portion A1 at predetermined intervals in the circumferential direction, and the screws are inserted through the band B and the duct connection portion A1. Stop.
At this time, since the tool engaging portion D2 of the screw D is unified in the same size and shape as the tool engaging portion 1b of the band winding shaft 1 described above, the screwing operation can be performed using the same driver.
In particular, if an electric screwdriver is used, the band B tightening operation and screw fixing operation can be performed more efficiently.

  Although not shown, it is possible to screw the band B over the bent portion of the one end B1 on the winding start side, or to screw the bent portion and the seat plate 2b of the frame 2 as necessary. It is.

  Further, in order to allow the band take-up shaft 1 to be rotatable and restrict movement in the axial direction, the outer diameter of the head 1a is made larger than the inner diameter of the bearing hole 2b, and the tip 1d on the opposite side is set to each. When it is locked in the axial direction with respect to the peripheral edge portion of the bearing hole 2c, there is an advantage that the band winding shaft 1 can be prevented from coming off in the axial direction without a fixing part such as a nut.

  Further, the other end B2 on the winding end side of the band B is directed to the through hole 2e formed in the seat plate 2b of the frame body 2 from the surface on the duct side of the seat plate 2b, and the band winding shaft as it is. When the arrangement is such that it is inserted into the band insertion hole 1 and wound up, the other end B2 on the winding end side of the band B is not directly penetrated into the through hole 2e, but directly into the insertion hole of the band winding shaft 1. There is an advantage that the contact area between the band B and the connection portion A1 of the ducts A and A ′ can be increased as compared with the case of being inserted and wound.

  Furthermore, when one end or both ends of the seat plate 2b are bent to integrally form the reinforcing piece 2f that enters between the two supporting pieces 2a, the band B is tightened by the rotation of the band winding shaft 1. Since the support pieces 2a are not bent and deformed inward, the rotation operation of the band winding shaft 1 is not hindered, the band B can be tightened smoothly, and the overall thickness of the frame 2 can be reduced. There is an advantage that the cost can be further reduced.

  In the second embodiment, as shown in FIG. 4, the seat plate 2b of the frame body 2 is extended in one or both of the circumferential direction of the duct connecting portion A1 and the orthogonal direction thereof, thereby increasing the contact area between these two. The enlarged configuration is different from the first embodiment shown in FIGS. 1 to 3, and other configurations are the same as those of the first embodiment shown in FIGS. 1 to 3.

In the case of the illustrated example, the support piece 2a of the frame body 2 is formed in a substantially triangular shape.
Further, the seat plate 2b of the frame 2 penetrates through the other end B2 on the winding end side of the band B, separately from the locking hole 2d on which the one end B1 on the winding start side of the band B is locked. A plurality of holes 2e are formed, and the other end B2 on the winding end side of the band B is penetrated from one of the through holes 2e through the duct side surface of the seat plate 2b. Is pulled out toward the band locking means 1c, inserted into the band insertion hole, and wound up.

  Therefore, in Example 2 shown in FIG. 4, the frictional resistance generated between the seat plate 2 b of the frame 2 and the duct connection portion A <b> 1 is greater than in Example 1 shown in FIGS. 1 to 3. There is an advantage that the frame 2 of the band fastener C is hardly displaced with respect to the duct connection portion A1, thereby improving workability.

In the embodiment shown above, one duct A is covered outside the end of the round duct, and the other duct A ′ is covered with the end of the flexible duct. You may use it, or you may use for the connection part of square ducts.
Furthermore, although the band insertion hole was opened in the band winding shaft 1 as the band locking means 1c, the present invention is not limited to this, and other locking means such as winding the band B around the band winding shaft 1 are adopted. May be.
Further, the head 1a of the band take-up shaft 1 is made larger than the inner diameter of the bearing hole 2b, and the axial movement is restricted by forming a pressure-deformed retaining portion 1d at the opposite end. However, the present invention is not limited to this, and the movement in the axial direction may be restricted by fixing a stopper such as a nut.

A, A 'Duct A1 Connection part B Band B1 One end part on the winding start side B2 The other end part on the winding end side C Band fastener 1 Band take-up shaft 1a Head 1b Tool engagement part 1c Band locking means 1d Retaining Part 2 Frame 2a Supporting piece 2b Seat plate 2c Bearing hole 2d Locking hole 2e Through hole 2f Reinforcing piece D Screw D1 Head D2 Tool engaging part

Claims (3)

A band (B) wound around the outer periphery of the connection portion (A1) in which a plurality of ducts (A, A ′) are overlapped, and a band winding shaft (1) for winding and tightening the band (B) are freely rotatable. And a plurality of screws (D) screwed at predetermined intervals in the circumferential direction across the connecting portion (A1) of the duct (A, A ′) and the band (B). A tool engaging part (1b) formed on the head part (1a) of the band winding shaft (1), and a tool engaging part (D1) formed on the head part (D1) of the screw (D). A duct connecting device characterized in that D2) is unified in the same size and shape. The band fastener (C) includes the band winding shaft (1) and a frame (2) in which a pair of support pieces (2a) are formed in a U shape with a seat plate (2b) interposed therebetween. The band winding shaft (1) is rotatably inserted through the bearing hole (2c) opened in the support piece (2a) and protrudes from the bearing hole (2c). The head (1a) of (1) is made larger than the inner diameter of the bearing hole (2b), and a pressure-deformed retaining part (1d) is formed at the tip opposite to the head (1a). The duct connection device according to claim 1. A locking hole (2d) in which one end (B1) on the winding start side of the band (B) is locked to the seat plate (2b) of the frame (2), and a winding end of the band (B) And the other end (B2) on the winding end side of the band (B) penetrating the through hole (2e) is formed by the band winding. 3. The duct connection device according to claim 2, wherein the duct connection device is arranged so as to be wound around the take-up shaft (1).

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