JP2002061935A - Flexible joint material for duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible joint through which mounting between a mounting part for a pair of flange members and a belt-form canvass can be reliably and firmly executed. SOLUTION: A flexible joint material for a duct comprises a pair of belt-form flange members provided at one end part with a mounting part bent in a U- shape, a belt-form canvass formed of a sheet material having two sides inserted in the mounting parts of a pair of the flange members, and a number of lock pieces formed at given interval at a mounting part for a pair of flange members, in which the two sides of the belt-form canvass are inserted, and having a tip part cut in a manner to cut through the belt-form canvass.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct flexible joint material constituting a main part of a duct flexible joint.

[0002]

2. Description of the Related Art A conventional flexible joint material for a duct has a U-shaped end.
A pair of band-shaped zinc iron plate flange members having attachment portions bent in a letter shape, a band-shaped canvas formed of a sheet material having both sides inserted into the attachment portions of the pair of flange members, It comprises a dowel for caulking formed at predetermined intervals in the mounting portions of the pair of flange members into which both side surfaces of the strip-shaped canvas are inserted.

[0003]

In the conventional flexible joint material for a duct, the mounting portions of a pair of flange members and both side portions of the strip-shaped canvas are fixed by crimping dowels formed at predetermined intervals. If the bending part of the mounting part of the flange member is not sweet or the dowel for caulking is not
When a force is applied between the belt-like canvas and the pair of flange members, there is a disadvantage that the attachment portion comes off.

The present invention has been made in view of the above-mentioned conventional drawbacks,
It is an object of the present invention to provide a duct flexible joint material capable of securely and firmly attaching an attaching portion of a pair of flange members to a strip-shaped canvas.

The above and other objects and novel features of the present invention will become more completely apparent when the following description is read in conjunction with the accompanying drawings. However, the drawings are for explanation only, and do not limit the technical scope of the present invention.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a pair of band-shaped flange members having a U-shaped mounting portion at one end, and mounting of the pair of flange members. A strip-shaped canvas formed of a sheet material having both sides inserted into the portion, and a strip-shaped canvas formed at a predetermined interval on a mounting portion of the pair of flange members into which both sides of the strip-shaped canvas are inserted. A flexible joint material for a duct is constituted by a large number of locking projections cut so that the front end portion cuts into the end.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

In the first embodiment of the present invention shown in FIGS. 1 to 11, reference numeral 1 denotes a flexible joint material for a duct of the present invention, and the flexible joint material 1 for a duct is bent at one end into a U-shape. A pair of flange members 3, 3 using a galvanized steel plate having attached mounting portions 2, 2, and both side surfaces are inserted into the mounting portions 2, 2 of the pair of flange members 3, 3, and the pair of flange members A band-shaped canvas 4 made of a sheet material whose other end portions are overlapped by a predetermined amount, and mounting portions 2, 2 of the pair of flange members 3, into which both side surfaces of the band-shaped canvas 4 are inserted. And a plurality of locking projections 5 formed at predetermined intervals and cut so that the leading end bites into the strip-shaped canvas 4.

As shown in FIG. 4, the strip-shaped canvas 4 is obtained by sewing a single-sided aluminum foil glass cloth 6 and a nylon tarpaulin 7 on top of each other, or as shown in FIG. , 6 are superposed and sewn so as to face each other.

As shown in FIG. 6, each of the plurality of locking projections 5 has a triangular pyramid-shaped cutting male die 9 having one end formed on a vertical surface 8, and receives the cutting male die 9. Recess 10 on the bottom
The cutting end 5a of the locking projection 5 is formed so as to bite into the strip-shaped canvas 4 by using a female mold 12 having a receiving portion 11 forming the same.

In the flexible joint member 1 for a duct having the above-described structure, since a large number of locking projections 5 whose leading ends are cut into the strip-shaped canvas 4, there is a problem that the flexible joint member 1 comes off even if a tensile force is applied. Since it does not occur, it is opened as shown in FIG. 7, and the pair of flange members 3, 3 are provided with folds 13, 13, as shown in FIG.
4, 14, 14 can be easily formed. Thereafter, as shown in FIG. 9, the sheet is bent into a quadrangular cylindrical shape, and the leading end is bent substantially at a right angle by a roll forming machine. Next, the corner pieces 15, 15, 15, 15 are positioned at the corners, and the distal end portion is fixed by caulking as shown in FIG. After a while, FIG.
As shown in (1), the overlapped connection portion of the canvas 4 is closed at a predetermined interval with a staple or a caulking fitting and the like and fixed thereon with an adhesive tape 17, whereby the duct flexible joint 18 is completed.

[0012]

FIG. 12 to FIG.
Hereinafter, different embodiments of the present invention will be described. In the description of the different embodiments of the present invention, the same components as those of the first embodiment of the present invention are denoted by the same reference numerals, and duplicate description will be omitted.

The second embodiment of the present invention shown in FIGS. 12 to 14 is mainly different from the first embodiment of the present invention in that the mounting portions 2, 2 has a large number of locking projections 5, 5 formed in two rows at a predetermined interval.
Even in the case of A, the same operation and effect as those of the first embodiment of the present invention can be obtained.

The third embodiment of the present invention shown in FIG. 15 to FIG. 17 is mainly different from the first embodiment of the present invention in that the mounting portions 2 of the pair of flange members 3 2, a large number of locking projections 5, 5, 5
Is formed so that the bottom surface of the portion where the locking projections 5, 5 and 5 are formed becomes a flat surface. The same operation and effect as those of the first embodiment can be obtained.

In each of the embodiments of the present invention, the pair of flange members 3 and 3 are described using a galvanized steel plate. However, the present invention is not limited to this, and the present invention is not limited to this. A metal plate such as an iron plate may be used. Further, in each of the embodiments of the present invention, the use of the strip-shaped canvas 4 having a size in which the other end portions of the pair of flange members 3 and 3 are superimposed has been described. It is also possible to use a strip-shaped canvas 4 whose dimensions do not overlap the other ends of the flange members 3 and 3.

[0016]

As apparent from the above description, the following effects can be obtained in the present invention.

(1) A pair of band-shaped flange members having a U-shaped attachment portion at one end thereof, and a sheet material having both sides inserted into the attachment portions of the pair of flange members. A belt-shaped canvas and a plurality of hooks formed at predetermined intervals on mounting portions of the pair of flange members into which both side surfaces of the belt-shaped canvas are inserted and cut so as to cut into the belt-shaped canvas at the tip end. Since a plurality of locking projections is used, even if a force such that the strip-shaped canvas comes off from the mounting portion of the pair of flange members is applied by the plurality of locking projections, the end portions of the multiple locking projections are applied. Cuts into the strip-shaped canvas, and can be reliably prevented from coming off. Therefore, a duct flexible joint can be easily manufactured, as compared with a conventional crimping dowel which comes off when a relatively small force acts thereon.

(2) According to the above (1), since a large number of locking projections cut into the strip-shaped canvas, even if the mounting portions of the pair of flange members are not easily bent, a large number of locking projections can be obtained. Even if the piece is not easily formed, the strip-shaped canvas can be surely prevented from coming off if the tip of the locking projection is cut. Therefore, it can be manufactured so that no defective products are generated, and the cost can be reduced.

(3) Claim 2 has the same effect as (1) and (2).

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a bottom view of the first embodiment of the present invention.

FIG. 3 is a side view of the first embodiment of the present invention.

FIG. 4 is an explanatory view of a strip-shaped canvas according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram of a different strip-shaped canvas according to the first embodiment of the present invention.

FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. 1;

FIG. 7 is an explanatory view in which a fold and a cut portion are formed on a pair of flange members.

FIG. 8 is an explanatory diagram of an open state according to the first embodiment of this invention.

FIG. 9 is an explanatory view of a state in which a pair of flange members are bent.

FIG. 10 is an explanatory view showing a state where a corner piece is attached.

FIG. 11 is an explanatory diagram of a fixed state of a connection portion of a canvas.

FIG. 12 is a plan view of a second embodiment of the present invention.

FIG. 13 is a side view of the second embodiment of the present invention.

FIG. 14 is an enlarged sectional view taken along line 14-14 of FIG. 12;

FIG. 15 is a plan view of a third embodiment of the present invention.

FIG. 16 is a bottom view of the third embodiment of the present invention.

FIG. 17 is a partially cutaway side view of the third embodiment of the present invention.

[Explanation of symbols]

1, 1A, 1B: flexible joint material for duct, 2: mounting part,
3: flange member, 4: strip-shaped canvas,
5: locking projection, 6: single-sided aluminum foil glass cloth, 7: nylon tarpaulin, 8: vertical surface, 9: cut male type,
10: concave portion, 11: receiving portion, 12: female type,
13: Fold, 14: Cut, 15: Corner piece, 16: Flange fixing bracket, 17: Adhesive tape, 18: Flexible joint for duct.

Claims (2)

[Claims] 1. A band-shaped pair of flange members having a U-shaped attachment portion at one end, and a sheet material formed of a sheet material having both sides inserted into the attachment portions of the pair of flange members. And a plurality of latches formed at predetermined intervals in attachment portions of the pair of flange members into which both side surfaces of the strip-shaped canvas are inserted, and cut so that the tip ends bite into the strip-shaped canvas. A flexible joint material for a duct, comprising a projecting piece. 2. A flange member using a pair of belt-shaped galvanized steel plates having a U-shaped attachment portion at one end, and a sheet having both sides inserted into the attachment portion of the pair of flange members. A strip-shaped canvas made of a material, and a plurality of rows formed at predetermined intervals in attachment portions of the pair of flange members into which both side surfaces of the strip-shaped canvas are inserted. A flexible joint material for a duct, comprising: a plurality of locking projections cut into pieces.