JP2011163707A - Joint for canvas used for flexible joint for duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and securely carry out work for forming a cylindrical canvas by joining ends of a canvas used for a flexible joint with a joint for a canvas, and to fix a reinforcement wire of the canvas without backlash. <P>SOLUTION: The joint 3 for joining one end 2a and the other end 2b of the canvas 2 includes an inner plate 10, an outer plate 11, and a tapping screw 12. The inner plate 10 is provided with a tapping hole 13a, and the outer plate 11 is provided with a screw insertion hole 14a. Canvas side surfaces of the both plates 10, 11 are provided with wire storage holes 15, 16. One end 2a and the other end 2b overlapping each other are sandwiched between the inner/outer plates 10, 11. The one end 2a and the other end 2b are connected by the tapping screw 12 to be joined to each other. Both ends 8a, 8b of the reinforcement wire 8 are inserted into the wire storage holes 15, 16 to be fixed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a joint for binding a canvas that constitutes a flexible joint for a duct, which is used for the purpose of vibration absorption between ducts, together with a connection flange.

  A flexible joint for ducts is interposed between ducts of rigid structure installed for the purpose of air conditioning and smoke exhausting inside buildings such as buildings, and when the ducts shake with the building due to earthquakes or other vibrations, By absorbing this with a canvas having elasticity and flexibility, damage to the rigid duct is prevented as much as possible.

  This flexible joint is, for example, cut into a predetermined length of a canvas wound in a roll shape, suspended in a cylindrical shape with a circular or rectangular cross section, and superposed one end and the other end inside and outside, and connected to both side edges The flange is fixed, and one end and the other end of the polymerized canvas are bonded using staples, eyelets, die caulking, rivet caulking, and other joints, and the top is fixed with adhesive tape or the like. (For example, refer to Patent Document 1).

Japanese Patent Laying-Open No. 2005-233534 (paragraph number 0018, FIG. 13)

As exemplified in Japanese Patent Application Laid-Open No. H10-228867, the binding of the both ends of the canvas is a point where the joint is fine, such as a staple, eyelet, die caulking, or rivet caulking. In such a point connection, the end of the canvas cannot have sufficient connection strength, so many of these joints must be used at a fine pitch in the width of the canvas, which requires a great deal of labor and time. In addition, there was a drawback that the cost was high.
In addition, most flexible joints are manufactured by the rigid duct contractor in accordance with the structure and installation conditions of the rigid duct, so-called on-site adjustment. However, the rigid duct is assembled by using a general-purpose tool such as a spanner or screwdriver. The attachment of the joint end of the canvas is troublesome in that a special tool such as a stapler or a caulking tool must be prepared.

In addition, some flexible joint canvases have a deformation prevention reinforcement inserted in the longitudinal direction of the center of the canvas so that they can withstand the internal wind pressure when installed as flexible joints in buildings. When a contractor manufactures a flexible joint using a canvas containing this reinforcing wire, the reinforcing wire is cut approximately along both ends of the canvas, but the end of the reinforcing wire is either cut or covered with a simple end cap. In most cases, the ends of the reinforcing wire are not fixed in most cases.
For this reason, when a flexible joint is installed in a building and receives internal wind pressure, the canvas and the end of the reinforcing wire rub against each other, and the end cap is removed by this rubbing, and the canvas is damaged at the end of the reinforcing wire. There was a thing.

  The present invention has been made in the background of such a situation, and the purpose of the present invention is to allow the work of binding the canvas into a cylindrical shape in a short time without using a special tool. Accordingly, it is an object of the present invention to provide a canvas joint used for a duct flexible joint, which can contribute to cost reduction. Furthermore, as a further object of the present invention, there is provided a canvas joint used for a duct flexible joint that does not damage the canvas at the end of the reinforcing wire even if a canvas containing a reinforcing wire is used for the flexible joint. .

  In order to achieve the above-described object, the present invention suspends a belt-like canvas in a cylindrical shape and superposes one end and the other end thereof inside and outside, and joints the one end and the other end of the superposed canvas. A joint for canvas used in a duct flexible joint formed by fixing connection flanges to both side edges of a canvas bound in a tubular shape, the joints being at both ends of the superposed canvas An inner plate and an outer plate that are overlapped on the inside and outside, and a set screw that screws both plates from the outside of the outer plate and connects the both ends of the overlapped canvas together. A pair of set screw holes are drilled in each of the two plates, and the key is interposed between the holes on the canvas side surfaces of the inner plate and the outer plate. It is characterized in that a wire receiving hole for accommodating one end and the other end of the longitudinal reinforcing wires provided for the deformation preventing Nbasu.

You may divide | segment the wire accommodation hole of an inner side plate and an outer side plate for the one end parts and the other end parts of a reinforcement wire, respectively.
In addition, the hole for the set screw drilled in the outer plate is a screw insertion hole larger in diameter than the set screw, and the hole for the set screw drilled in the inner plate is cut into the female screw by screwing in the set screw. It can be set as a screw insertion hole larger in diameter than the tap hole or set screw provided.

  The canvas joint of the present invention comprises two inner and outer plates and a pair of set screws, and in order to bind one end and the other end of the canvas using this, the belt-like canvas is suspended in a cylindrical shape. Rotate to superimpose the one end and the other end in and out, and superimpose the inner and outer plates on the inner and outer ends of the overlapped canvas with the inner and outer plates. One end and the other end of the reinforcing wire are accommodated in the wire accommodating hole.

Next, insert the set screw from the outside of the outer plate into the set screw hole of the outer plate, and then insert the set screw that penetrates one end and the other end of the canvas into the set screw hole of the inner plate. Screw both ends of the canvas together by screwing nuts onto the ends of setscrews that pass through the inner plate and protrude to the inside of the canvas, and screw both the inner and outer plates. At the same time, both ends of the reinforcing wire are sandwiched between the two plates without backlash. This screwing operation is performed using a general-purpose tool such as a screwdriver or a spanner.
Thus, even if the flexible joint is installed between the rigid ducts inside the building and the flexible joint receives the internal wind pressure, the canvas and the end of the reinforcing wire do not rub against each other.
In addition, it does not prevent using the joint of this invention for the canvas without a reinforcing wire.

  The canvas joint of the present invention uses at least one pair at the center of both ends of the overlapped canvas, and when the canvas is wide, a plurality of sets are used in the width direction of the canvas. Since the portions are sandwiched by surface contact, the number of used parts can be reduced as compared with a conventional point contact joint.

  When screwing the inner plate and outer plate, the hole for the set screw on the outer plate is a screw insertion hole larger in diameter than the set screw, but the hole for the set screw on the inner plate is larger than the set screw. Form a large-diameter screw insertion hole and screw the nut onto the tip of the set screw that protrudes from the inner plate to the inside of the canvas, or use the inner plate's set screw hole as a tap hole. A tapping screw may be screwed into and a female screw may be engraved. In the latter case, the tapped holes are cut and the female screw is set up to prevent loosening of the set screw, and the number of parts can be reduced by omitting the nut.

As described above, according to the canvas joint of the present invention, the work of binding the canvas into a cylindrical shape can be easily performed in a short time using a general-purpose tool, thereby reducing the production cost. I can plan. In particular, when a canvas containing reinforcing wire is used, both ends of the reinforcing wire are clamped at the same time as the inner and outer plates are screwed, so a flexible joint can be attached without damaging the canvas at both ends of the reinforcing wire. It can be used over a long period of time.
In addition, by making the hole for the set screw on the inner plate into a tap hole, the tapping screw screwed into this tap hole engraves the internal thread, so it has the effect of preventing the set screw from loosening, and the nut can be omitted, so the number of parts Can be reduced.

It is an expanded sectional view of the state where one end part and other end part of the canvas were bound using the canvas joint which shows the 1st example of the present invention. It is a perspective view of the flexible joint which shows the 1st example of a form of this invention. It is a top view in the state where the flexible joint which shows the 1st example of the present invention was equipped between ducts. It is IV-IV sectional drawing of FIG. 1 which shows the 1st form example of this invention. It is an expanded sectional view of the state where one end part and other end part of a canvas were bound using a canvas joint which shows the 2nd example of the present invention. It is a perspective view of the flexible joint which shows the 3rd form example of this invention. It is a top view in the state where the flexible joint which shows the example of the 3rd form of the present invention was installed between ducts. It is an expanded sectional view of the state where one end part and other end part of a canvas were bound using a canvas joint which shows the 3rd example of the present invention. It is IX-IX sectional drawing of FIG. 8 which shows the 3rd form example of this invention.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention, FIG. 5 shows a second embodiment of the present invention, and FIGS. 6 to 9 show a third embodiment of the present invention.
The flexible joint 1 for ducts shown in the first embodiment of FIGS. 1 to 4 has a canvas 2 as a joint body connected in a cylindrical shape using a pair of canvas joints 3, and is attached to both side edges of the canvas 2. As shown in FIG. 3, metal connection flanges 4, 4 are arranged in a ring shape, and as shown in FIG. When the duct 5 sways with the building due to an earthquake or the like, it is absorbed by the canvas 2 having elasticity and flexibility so that damage to the duct 5 is prevented as much as possible. Yes.

The canvas 2 is made of, for example, a non-combustible cloth whose surface is subjected to a fireproofing treatment such as aluminum foil, a cloth called a so-called tarpaulin in which a synthetic fiber such as a polyester fiber is coated with vinyl chloride, an olefin resin, or rubber, or a glass fiber. A cloth coated with the same resin or rubber is formed on the material so that it can expand and contract or bend due to vibration or the like.
The canvas 2 has a narrow bag-like portion 7 in which a central portion in the length direction is sewn with sewing machines 6 and 6 on the left and right sides, and a reinforcing wire 8 is inserted into the bag-like portion 7, and is bent. When the joint 1 is installed between the rigid ducts 5 and 5 and receives the internal wind pressure, the canvas 2 is not greatly deformed.

The canvas 2 before being used for the flexible joint 1 is wound in a long roll shape, and the outer peripheral side thereof is pulled out and cut slightly longer than the outer peripheral length of the main body of the flexible joint 1. When the flexible joint 1 is formed by connecting the one end 2a and the other end 2b of the canvas 2 overlapped inside and outside with a pair of canvas joints 3 in the same diameter cylindrical shape, The width of the canvas 2 wound in the shape becomes the length of the joint body between the connection flanges 4 and 4.
The reinforcing wire 8 in the bag-like portion 7 is integrally cut when the canvas 2 wound in a roll shape is cut, and one end 8 a and the other end 8 b of the canvas 2 are connected to the body portion of the flexible joint 1. When the cylinders have the same diameter, they are superimposed on the inside and outside.

  The canvas joint 3 includes a lateral rectangular inner plate 10 and an outer plate 11, and two self-tapping screws 12 and 12. The inner plate 10 and the outer plate 11 are made of, for example, a synthetic resin plate such as vinyl chloride resin. Tap holes 13 a and 13 a are formed in the longitudinal direction of the inner plate 10, and the outer plate 11 is disposed in the longitudinal direction. The screw insertion holes 14a, 14a with counterbore holes are formed at the same pitch as the tap holes 13a, 13a of the inner plate 10.

The tapping screw 12 corresponds to the set screw of the present invention, and the tap hole 13a of the inner plate 10 corresponds to the set screw hole of the present invention, and the tap hole 13a has a slightly smaller diameter than the shaft diameter of the tapping screw 12. The screw insertion hole 14 a of the outer plate 11 is formed to have a diameter slightly larger than the shaft diameter of the tapping screw 12.
On the canvas side surface of the inner plate 10, a wire material receiving hole 15 wider than the two reinforcing wire members is recessed between the tap holes 13 a, 13 a over the entire length in the width direction of the inner plate 10. 11, a wire material accommodation hole 16 having the same width as the wire material accommodation hole 15 of the inner plate 10 is recessed between the screw insertion holes 14a and 14a.

  When the length of the canvas 2 between the connection flanges 4 and 4 serving as a joint body of the flexible joint 1 is, for example, 200 to 300 mm, the inner and outer plates 10 and 11 have a length of 20 to 40 mm and a width of 10 mm. A rectangular vinyl chloride resin plate of about ˜25 mm is used, and between the tap holes 13 a, 13 a and between the screw insertion holes 14 a, 14 a, a wire containing hole 15 having a width of 6-8 mm and a depth of about 1-2 mm, 16 is recessed.

  As shown in FIGS. 1 and 4, when both ends 2a and 2b of the canvas 2 are bound by the canvas joint 3 of this embodiment, the belt-like canvas 2 is suspended in a cylindrical shape and the one end 2a and The other end 2b is superposed on the inside and outside, and the inner plate 10 and the outer plate 11 are superposed on the inner and outer centers of the superposed one end 2a and the other end 2b. One end 8a and the other end 8b of the reinforcing wire 8 are accommodated in the wire accommodating holes 15 and 16 to be formed.

Next, tapping screws 12 are respectively inserted into the screw insertion holes 14 a and 14 a from the outside of the outer plate 11, the tapping screws 12 are passed through both end portions 2 a and 2 b of the canvas 2, and the tapping screws 12 are further inserted into the inner plate 10. The inner and outer plates 10 and 11 are screwed by screwing into the tapped hole 13a and engraving the tapped hole 13a with female threads. Thereby, both ends 2a and 2b of the canvas 2 are bound, and further, both ends 8a and 8b of the reinforcing wire 8 are sandwiched between the plates without backlash. This screwing operation is performed using a general-purpose tool such as a driver.
As a result, even if the flexible joint 1 is installed between the rigid ducts 5 and 5 and the flexible joint 1 receives the internal wind pressure, the canvas 2 and the ends 8a and 8b of the reinforcing wire 8 do not rub against each other. The performance as the joint 1 can be well maintained for a long time.

The both ends 2a and 2b of the canvas 2 are bonded only at the center by the canvas joint 3. However, since the inner plate 10 and the outer plate 11 sandwich the both ends 2a and 2b in a wide area without any gaps, they are bent. It has a binding strength enough to withstand the wind pressure inside the joint 1. Further, both ends 2a and 2b of the canvas 2 are simply overlapped on the both sides of the canvas joint 3. However, when the wind pressure inside the flexible joint 1 or the flexible joint 1 itself vibrates, both ends 2a and 2b Since the flexible joint 1 can be flexibly moved in and out of the flexible joint 1 and in the width direction, no mischievous load is required.
Furthermore, in this embodiment, both the plates 10 and 11 are overlapped inside and outside by making the wire receiving holes 15 and 16 recessed in the center of the canvas side surfaces of the inner and outer plates 10 and 11 wider than the two reinforcing wires. There is an advantage that the two ends 8a and 8b of the reinforcing wire 8 can be easily accommodated in the wire material receiving holes 15 and 16 when they are combined.

Next, second and third embodiments of the present invention will be described. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The canvas joint 20 of the second embodiment shown in FIG. 5 employs through screws 21 and 21 that are longer than the thicknesses of both plates 10 and 11 and both ends 2a and 2b of the canvas 2 as set screws of the present invention. A screw insertion hole 22 having a diameter larger than the shaft diameter of the screw 21 is formed through a hole for a set screw formed in the inner plate 10, and the tip of the through screw 21 protruding from the screw insertion hole 22 to the inside of the canvas 2. A nut 23 is screwed onto the wire 10 and the wire material receiving holes 24 and 25 that are recessed between the screw insertion holes 14a and 14a and between the screw insertion holes 22 and 22 on the canvas side surfaces of both plates 10 and 11 are reinforced. The wire 8 is different from the first embodiment described above in that the wire 8 is divided into one for the one end 8a and the other end 8b.

  The third embodiment shown in FIGS. 6 to 9 shows an example in which the canvas joint 3 similar to that in the first embodiment is used but the canvas 30 having no reinforcing wire is used. Although it does not have the function of fixing both ends of the reinforcing wire, it is used only to achieve the basic function of simply and surely connecting the one end 30a and the other end 30b of the canvas 30 with the minimum one set configuration. Yes.

DESCRIPTION OF SYMBOLS 1 ... Flexible joint for ducts 2, 30 ... Canvas 2a, 30a ... One end part of canvas 2, 30 2b, 30b ... Other end part of canvas 2, 30 3,20 ... Joint for canvas 5 ... Rigid duct 6 ... Sewing wire DESCRIPTION OF SYMBOLS 7 ... Bag-shaped part 8 ... Reinforcing wire 8a ... One end part of reinforcing wire 8 8b ... Other end part of reinforcing wire 8 10 ... Inner plate 11 ... Outer plate 12 ... Tapping screw 13a ... Tap hole 14a, 22 ... Screw insertion hole 15 , 16 ... Wire material accommodation hole 21 ... Through screw 23 ... Nut 24, 25 ... Wire material accommodation hole

Claims (3)

Suspend the belt-like canvas in a cylindrical shape and polymerize one end and the other end in and out,
This canvas joint is used for duct flexible joints, where one end and the other end of this superposed canvas are connected by a joint, and connecting flanges are fixed to both side edges of the tubular canvas. There,
The joint includes an inner plate and an outer plate that are superimposed on the inside and outside of both ends of the superposed canvas, and a set screw that screws both plates from the outside of the outer plate to connect with both ends of the superposed canvas. A combination of
A pair of holes for the set screw are formed in each of the inner plate and the outer plate, and reinforcement is provided between the holes on the canvas side surface of the inner plate and the outer plate for preventing deformation in the longitudinal direction of the canvas. A canvas joint used for a flexible joint for ducts, characterized in that a wire accommodation hole for accommodating one end and the other end of a wire is provided. The canvas for use in a flexible joint for a duct according to claim 1, wherein the wire accommodating holes of the inner plate and the outer plate are respectively divided into one end and the other end of the reinforcing wire. Joint. The hole for the set screw drilled in the outer plate is a screw insertion hole larger in diameter than the set screw, and the hole for the set screw drilled in the inner plate is formed by screwing the set screw. 3. The canvas joint used for the duct flexible joint according to claim 1, wherein the internal thread is a tap hole in which a female screw is formed or a screw insertion hole having a diameter larger than that of the set screw.