JP2005030601A - Method of forming connection structure of end of accordion hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve airtight sealing performance of a fitting connection when a joint part is connected with a conduit hose without requiring troublesome work and time. <P>SOLUTION: A flexible hose is formed into a helical corrugated shape by forming a synthetic resin tube continuously extruded from an extrusion machine by a forming die. A helical groove formed in an inner surface of a ridge part of the corrugation at the end of the flexible hose is collapsed to form a closure part. The flexible hose is fitted and connected to the outside of a hose joint, and the closure part is brought into close contact with the outer surface of the hose joint to constitute the connection structure of the end of the hose. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a highly flexible hose used for a vacuum cleaner hose and the like and a structure for connecting the hose to a joint.

Conventionally, as this type of hose, as disclosed in Patent Document 1 below, a hard steel wire is not used as a spiral reinforcing core, and a resin-made peripheral wall such as polyethylene is molded into an uneven waveform along the axial direction. A hose (called a conduit hose in the industry) that is hard to be permanently deformed even when stepped on with a foot is known.
Japanese Patent Laid-Open No. 61-171986

However, this conduit hose is designed with relatively large corrugations to increase the crushing strength of the hose, and when the end of the hose is fitted and connected to the body side joint or the hand side joint of the vacuum cleaner, The groove formed on the inner surface of the peripheral wall that is connected to the spiral serves as an air passage, and slightly communicates with the outside, causing air to flow into the hose from outside and reducing the suction force. For this reason, measures were taken to project a ring-shaped projection on the joint, abut the end of the hose against this projection, and seal the gap between them with an adhesive, etc., but the process is cumbersome and inefficient there were.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to improve its airtightness without requiring troublesome work for fitting connection with a joint portion of a conduit hose. .

The present invention solves the above-mentioned problems by devising the shape of the molded hose end, and has the following configuration.

(1) A hose in which a synthetic resin tube continuously extruded from an extruder is molded into a spiral corrugated corrugation by a molding die, and a spiral groove formed on the corrugated peak inner surface of the end of the hose is crushed. A flexible hose having a closed portion formed therein.

(2) A hose in which a synthetic resin tube continuously extruded from an extruder is formed into a spiral concave and convex waveform by a molding die, and a spiral groove formed on the corrugated valley outer surface of the hose end is crushed. A flexible hose having a closed portion formed therein.

(3) A hose end connection structure in which the flexible hose described in (1) is fitted and connected to the outside of the hose joint, and the closed portion is closely attached to the outer surface of the hose joint.

(4) A hose end connection structure in which the flexible hose described in (2) above is fitted and connected to the inside of the hose joint, and the closed portion is brought into close contact with the inner surface of the hose joint.

In the present invention, due to the shape of the molded conduit hose itself, when the hose and the joint are fitted and connected, the inside and the outside of the hose are completely shut off, and the inflow of air without any processing or processing after the hose molding. Leakage can be prevented.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a corrugated synthetic resin formed integrally from a crest (convex) 2 and a trough (concave) 3 in which a hose wall is spirally formed along the axial direction over its entire length. A bellows hose made of (for example, a polyolefin resin such as polyethylene).

This bellows hose 1 is manufactured by cutting an indefinite length hose continuously formed into a predetermined length along the cutting line SS, and the vicinity of the left and right of the cutting line SS is one end of the hose. A clogging portion that becomes a portion 1a and the other end portion 1b, and one peak portion 2a, 2b at both end portions 1a, 1b crushes the protrusion by a certain length along the circumferential direction to crush the spiral groove on the inner surface. 4 is molded.

FIG. 2 shows in detail the shape near the end 1a (or 1b) of the bellows hose 1, (A) is a cross-sectional view of the hose wall, and (B) is a cross-sectional view taken along line TT of (A). In addition, the spiral groove 5 formed along the inner periphery of the peak portion 2 is blocked by the closing portion 4.

In the present embodiment, the closing portion 4 fills and blocks the spiral groove 5 in the range of a relatively short length along the circumferential direction, but as a modified example, as shown in FIG. 6 can fill and block the spiral groove 5 over a substantially half circumference along the circumferential direction.

In addition, the closing part should just be what can interrupt | block the spiral groove 5 in a part of the circumferential direction, and the shape of a closing part can be arbitrarily designed from a viewpoint, such as connectivity with a hose joint.

FIG. 5 shows a state in which the end portion 1a (or 1b) of the bellows hose 1 shown in FIG. 2 is externally fitted to the cylindrical hose joint 7 and connected and fixed by an adhesive or the like. To prevent the spiral groove 5 on the inner surface of the ridge 2 from communicating.

As is well known in the art, the conduit hose is molded by extruding a soft synthetic resin tube that has been extruded in an annular shape from the die of an extruder along the axial direction of the tube, and blowing the air into the tube. While being expanded in the direction, the inner peripheral surface is configured by connecting a plurality of molding units having a corrugated uneven surface along the axial direction in an endless manner, and in the tube extrusion direction while being concentric with the tube. The two forming strips that can be rotated and moved so as to form a cylindrical forming mold that forms the peripheral wall of the tube in a waveform along the axial direction as the tube expands while moving along the tube. FIG. 4 shows an example of a molding unit 10 used for molding the end 1a (or 1b) of the bellows hose 1 shown in FIG.

The molding unit 10 is formed with a convex portion 11 protruding radially inward and a concave portion 12 recessed outward, and the inner peripheral surface 11a of the convex portion 11 is a surface along the outer peripheral surface of the valley portion 3 of the hose. The inner peripheral surface 12a of the recess 12 is configured as a surface along the outer peripheral surface of the hose peak 2.

The concave portion 12 of the molding unit 10 corresponding to the peak portion 2a (or 2b) at the end portion 1a (or 1b) of the bellows hose 1 is a flat surface protruding radially from a part of the inner peripheral surface 12a in the circumferential direction. 13 is formed and constitutes a surface along the outer surface of the blocking portion 4 of the hose peak portion 2a. In addition, the center part 13a of the flat surface 13 is formed in the substantially same height as the adjacent convex part inner peripheral surface 11a.

In this embodiment shown in FIGS. 2 and 3, the formation position of the blocking portion 4 or 6 in the length direction of the hose can be identified relatively easily from its external shape (particularly in the case of FIG. 3), When the long hose molded in this way is cut to a predetermined length with an automatic cutter, there is an advantage that the closed portion 4 or 6 can be easily detected by a sensor and cut at a predetermined position.

FIG. 6 shows another embodiment, and is a cross-sectional view in the case where the bellows hose 1 is fitted inside the hose joint 7 whose diameter is enlarged at the end portion and is connected and fixed with an adhesive or the like.

In this case, the bellows hose 1 is molded into a closed portion 8 in which the trough portion 3 at the end thereof is pushed up to a height substantially the same as the mountain portion 2 adjacent to the radially outward portion in a circumferential direction, The closed portion 8 crushes and blocks the groove 9 spirally connected to the outer surface of the valley portion 3, and closes the closed portion 8 to the outer surface of the mouth 7 to block the air passage.

The hose shown in FIG. 6 is also manufactured using the same molding unit as described above, and although not shown in this example, the convex part for molding the hose valley part of the molding unit is recessed in a part of the circumferential direction. It is formed on the inner peripheral surface corresponding to the outer surface shape of the closing portion 8.

  As described above, according to the present invention, although it is a conduit hose that is not easily deformed even when stepped on, the spiral groove serving as an air passage on the inner surface or outer surface of the hose is crushed and closed. Airtightness can be improved without a troublesome sealing process in fitting connection.

It is a partial sectional view of the hose of the present invention. It is side surface sectional drawing which shows hose edge part vicinity. FIG. 3 is a cross-sectional view taken along line TT in FIG. It is a cut sectional view showing other examples. It is a perspective view which shows an example of the shaping | molding unit which shape | molds a hose end part. It is sectional drawing which shows the state which connected the hose to the joint. It is sectional drawing which shows the state which connected the hose of the other Example to the joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bellows hose 2 Mountain part 3 Valley part 4 Closure part 5 Spiral groove 6 Closure part 7 Joint 8 Closure part 9 Helical groove 10 Forming unit 11 Convex part 12 Concave part 13 Flat surface

Claims (4)

A hose in which a synthetic resin tube continuously extruded from an extruder is formed into a spiral concave and convex waveform by a molding die, and a closed portion formed by crushing a spiral groove formed on the inner surface of the corrugated peak at the end of the hose A flexible hose formed. A hose in which a synthetic resin tube continuously extruded from an extruder is formed into a spiral concave and convex waveform by a molding die, and a blocking portion formed by crushing a spiral groove formed on an outer surface of a corrugated valley at the end of the hose A flexible hose formed. A connection structure of a hose end portion in which the flexible hose according to claim 1 is fitted and connected to the outside of the hose joint, and the closed portion is brought into close contact with the outer surface of the hose joint. A connection structure of a hose end portion in which the flexible hose according to claim 2 is fitted and connected to the inner side of the hose joint, and the closed portion is brought into close contact with the inner surface of the hose joint.

Images