JPS646463Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a duct, more specifically a duct made of synthetic resin or cloth material, and more specifically a duct of a predetermined width. This invention relates to a duct formed by winding a thin cloth into a spiral shape, and the duct is capable of sealing the part where the spiral shape is formed without using technical means such as adhesives or vulcanization.

An embodiment of this invention will be described below with reference to the accompanying drawings.

Fig. 1 is a partial cross-sectional view showing the duct of this invention, where 1 is the duct, 2 is a thin cloth for forming the duct, 3 is a cut spiral tube for sealing, and 4 is clearly seen from the proportional function with the others. (not shown) indicates a connecting string, and 5 indicates a joining line of thin cloth in a duct formed in a spiral shape.

As is clear from the figure, the duct 1 of this invention
is formed by winding a piece of thin cloth 2 in a spiral shape to form a spiral pitch of a predetermined width H,
Moreover, both edges of the thin cloth 2 are constructed so that the overlapping portion with a connecting string 4 interposed therebetween is cut and the joined portion is sealed by a split spiral tube 3.

Fig. 2 is an enlarged view of the cross section taken along the line in Fig. 1, and clearly shows the joining state at the helical part when a sheet of thin cloth 2 is wound in a spiral shape. The joining structure of the spiral portion will be explained as follows.

Thin cloth 21 on the left side of the cut spiral tube 3 in FIG.
The thin fabric 21 on the left and the thin fabric 22 on the right are both formed of a continuous thin fabric, but are shown with different symbols for convenience of explanation.
2, each of both end edges 21' and 22' are overlapped,
Moreover, it completely surrounds the connecting string 4 and is held between the split spiral tube 3 in a hugging manner with the connecting string 4 at the center.

More specifically, the edges 21' and 22' of the left and right thin cloths 21 and 22 are overlapped so that the connecting cord 4 is wrapped inside them, and the overlapping portion is placed inside the cut spiral tube 3. The thin fabric is held in a cradling manner, and the edges 21' and 22' of both thin fabrics are held in a sealed manner by both ends 31 and 32 of the cut spiral tube 3. Note that the reference numeral 5' indicates a sealant.

The thin cloth 2 can be made of synthetic resin, cloth, or resin-coated cloth, and the connecting cord 4 can be a thick cord or a knitted cord of a desired size. Further, the cut spiral tube 3 is made of a rigid material such as metal.

FIG. 3 is a schematic explanatory diagram of the manufacturing method of the duct of this invention, in which a thin cloth winding roller 7 movable in the direction of the arrow with respect to a mandle 12 having a spiral protrusion 6 is installed on a moving table 8, and , a cut spiral tube winding roller 9 and a connected string winding roller 10 that move in synchronization with the thin cloth winding roller 7 are installed, and the roller 7 is moved in the direction of the arrow while feeding out the thin cloth 2 from the thin cloth winding roller 7. The left and right end edges 21 and 22 are joined to a predetermined pitch width by the cut spiral tube 3 guided by the protrusion 6 of the mandle 12 and the connecting string 4. Note that reference numeral 11 is a pressure roller at the opening of the cut spiral tube.

With the above-mentioned structure, this device surrounds the overlapped portion of the thin cloth around the connecting string 4, and this surrounding portion is held within the cut spiral tube 3, and furthermore, the opening edge of the spiral tube is Therefore, since the holding bases of the overlapping portions of the thin fabrics are crimped, even if a tensile force is applied to the thin fabric 2 in the width direction, both edges 21, 2 of the thin fabric 2
2 does not separate, and in particular, both ends of the thin cloth 2 are completely pressed and sandwiched in an overlapping manner by both ends of the cut spiral tube 3, resulting in good sealing.Moreover, the connecting string 3
Since the thin cloth 2 is held in a hugging manner, both end edges 21' and 22' of the thin cloth 2 will not come apart even when the pressure inside the duct is large.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the duct of this invention, FIG. 2 is an enlarged cross-sectional view taken along the line of FIG. 1, and FIG. 3 is an explanatory diagram of the duct manufacturing apparatus. The symbols in the drawings are: 1: duct, 2: thin cloth, 3:
Cut spiral tube, 4: connecting string, 21, 22: left and right thin cloth, 21', 22': both ends of the thin cloth, respectively.

Claims (1)

[Scope of utility model registration request] Both ends of a piece of thin cloth are spiral-wound in an overlapping manner,
A connecting string of a predetermined thickness is interposed inside the overlapping portion of both ends, and this connecting string is surrounded by the overlapping portion of both end edges, and this surrounding overlapping portion is held in a cradling shape within the cut spiral tube. In addition, the left and right edges of the overlapping portion are extended outward from the opening side end of the split spiral tube, and the holding base is clamped in a crimped manner, so that the spiral winding is achieved. A duct characterized by comprising a joint.