JP5120607B2 - Cleaner hose - Google Patents

Description

  The present invention mainly relates to a cleaner hose provided in an electric vacuum cleaner.

  As a cleaner hose for an electric vacuum cleaner, as shown in FIG. 7, spiral grooves 2... Are formed along the inner peripheral surface of a flexible hose wall 1. Reinforcing wires 3... That also serve as conductive wires are accommodated, and the covering material of the reinforcing wires 3... A structure having flexibility is known (for example, see Patent Document 1).

JP 2001-25451 A

  In the cleaner hose having the above-described structure, the hose wall 1 that is required to be flexible is formed of a soft vinyl chloride resin having a high degree of polymerization, and the reinforcing wire 3 that is required to have durability and workability is covered. Some materials are made of a semi-rigid vinyl chloride resin having a low polymerization degree. However, when these materials are bonded with an adhesive, a sufficient adhesive force cannot be obtained, and the reinforcing wires 3. There was a problem that it was easy to peel off.

  This is because the soft vinyl chloride resin on the hose wall has a high degree of polymerization, and the adhesive effect of the adhesive cannot be exhibited well on the hose wall. In this case, the adhesive strength is considered to be weakened.

  The present invention has been made in order to solve the above-mentioned problems, and is provided for a reinforcing wire made of a hard or semi-rigid vinyl chloride resin having a low polymerization degree with respect to a hose wall made of a soft vinyl chloride resin having a high polymerization degree. It aims at providing the cleaner hose which can attach a coating | covering material firmly and stably.

In order to solve the above problems, the cleaner hose H of the present invention is a coating made of a hard or semi-rigid vinyl chloride resin having a low polymerization degree along the inner peripheral surface of the hose wall 20 made of a soft vinyl chloride resin having a high polymerization degree. A reinforcing wire 21 is formed by covering the core member 40 with a material 41, and the soft vinyl chloride of the hose wall 20 is attached to a reinforcing wire attaching portion 27 on the inner peripheral surface of the hose wall 20. An adhesive layer 30 made of a vinyl chloride resin having an average degree of polymerization lower than that of the resin and having an average degree of polymerization higher than that of the hard or semi-hard vinyl chloride resin of the covering material 41 of the reinforcing wire 21. integrally formed by extrusion, characterized in that bonding the covering material 41 ... of the reinforcing wire 21 ... via the adhesive 42 of the urethane to the adhesive layer 30 ....

Specifically, the average polymerization degree of the soft vinyl chloride resin of the hose wall 20 is 2000 to 4000, the average polymerization degree of the hard or semi-rigid vinyl chloride resin of the covering material 41. The average degree of polymerization of the vinyl chloride resin is set in the range of 1000 to 2500.

Further, the concave grooves 27 are formed in a spiral shape along the inner peripheral surface of the hose wall 20, and the adhesive layer 30 is provided near the bottom of the concave grooves 27. By attaching the covering material 41 of the reinforcing wire 21 to the adhesive wire 42 via the adhesive 42, the reinforcing wire 21 is attached in a state of being accommodated in the concave groove 27.

In the cleaner hose of the present invention, the hose wall has a lower average polymerization degree than the soft vinyl chloride resin of the hose wall on the inner peripheral surface of the soft vinyl chloride resin having a high polymerization degree , and the reinforcing wire covering material is hard. Alternatively, an adhesive layer made of a vinyl chloride resin having an average degree of polymerization higher than that of a semi-rigid vinyl chloride resin is integrally formed by coextrusion, and a reinforcing wire covering material is bonded to the adhesive layer via a urethane adhesive. Therefore, the adhesive force can be increased as compared with the conventional one in which the covering material of the reinforcing wire is directly bonded to the hose wall with an adhesive. Thereby, the reinforcing wire can be firmly and stably attached to the hose wall.

  In addition, an adhesive layer is provided near the bottom of the concave groove in the hose wall, and the reinforcing wire covering material is adhered to the adhesive layer, so that the reinforcing wire can be firmly and stably attached to the concave groove. A gap can be secured between the groove and the reinforcing wire. For this reason, the elongation of the hose wall is not easily restricted by the reinforcing wire, and the cleaner hose can be easily bent and rich in flexibility. Moreover, by housing the reinforcing wire in the concave groove, the inner surface of the cleaner hose can be made substantially smooth to reduce the windage loss, thereby reducing the load on the reinforcing wire and reducing the hose wall. The attachment strength of the reinforcing wire can be maintained well over a long period of time.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 2, a cleaner hose H according to an embodiment of the present invention is connected and connected between an operation cylinder 12 including a suction nozzle 11 and a cleaner body 13 in a vacuum cleaner 10.

  As shown in FIGS. 3 and 4, the cleaner hose H includes a flexible hose wall 20 and a plurality of reinforcement wires 21 spirally wound along the inner peripheral surface of the hose wall 20. The shape retaining property of the hose wall 20 is well maintained by these reinforcing wires 21.

  The hose wall 20 is formed with, for example, three spiral convex portions 25... Bulging outward from the hose diameter while maintaining a predetermined interval in the hose axial direction. A flat portion 26 is formed. And the hose inner peripheral surface side of each convex part 25 is a concave groove 27 having a substantially U-shaped cross section, and is a reinforcing wire attaching portion to which the reinforcing wire 21 is attached. The number of the concave grooves 27 is not limited to three, and may be one, two, or four or more by increasing or decreasing the number of the convex portions 25. The shape of the concave grooves 27 is not limited to a substantially U-shaped cross section, and may be a substantially U-shaped cross section or a substantially V-shaped cross section, for example.

  In each concave groove 27 of the hose wall 20, as shown in FIG. 1, an adhesive layer 30 for adhering the reinforcing wire 21 spirally continues along the concave groove 27 in the vicinity of the bottom of the concave groove 27. Is formed. Note that the adhesive layers 30 are not limited to be continuous spirally along the concave groove 27, and may be formed, for example, along the concave groove 27 at appropriate intervals in the spiral direction.

  Further, the reinforcing wires 21 are accommodated in the concave grooves 27, respectively. The number of the reinforcing wires 21 is not limited to three, and may be one, two, or four or more according to the number of the concave grooves 27.

  Each reinforcing wire 21 is formed by coating a core material 40 made of a hard steel wire made of, for example, a steel wire or a piano wire, a hard wire obtained by applying anti-rust plating to these wires with a covering material 41, for example, The cross section is formed in a substantially circular shape. Then, each reinforcing wire 21 is firmly and stably attached to the concave groove 27 by adhering the covering material 41 of each reinforcing wire 21 to the adhesive layer 30 in the concave groove 27 with an adhesive 42. In this way, the reinforcing wires 21 attached to the concave grooves 27 of the hose wall 20 are also used as conductive wires that electrically connect the operation cylinder 12 side and the cleaner body 13 side.

  Hereinafter, the reason why the reinforcing wire 21 is firmly and stably attached to each concave groove 27 of the hose wall 20 will be described. That is, the hose wall 20 is formed using a soft vinyl chloride resin (PVC) having a high degree of polymerization in consideration of flexibility. The average degree of polymerization of this soft vinyl chloride resin is set in the range of 2000 to 4000 (specifically, about 2500), for example. The covering material 41 of each reinforcing wire 21 is formed using a semi-rigid vinyl chloride resin (PVC) having a low polymerization degree in consideration of durability and workability. The average degree of polymerization of this semi-rigid vinyl chloride resin is set in the range of 800 to 1700 (specifically, about 1000), for example. Each adhesive layer 30 has a lower average polymerization degree than the soft vinyl chloride resin of the hose wall 20 and a higher average polymerization degree than the semi-rigid vinyl chloride resin of the covering material 41 of each reinforcing wire 21. (PVC) is used. The average degree of polymerization of this vinyl chloride resin is set, for example, in the range of 1000 to 2500 (specifically, about 1300). Note that various additives such as a plasticizer are mixed in the vinyl chloride resin of the hose wall 20, the respective covering materials 41, and the respective adhesive layers 30.

  The adhesive layer 30 is integrally provided in each concave groove 27 of the hose wall 20 by heat fusion. Specifically, when the hose wall 20 is formed, the adhesive layer 30 is integrally formed in each concave groove 27 simultaneously with the formation of the hose wall 20 by coextrusion. Thus, since the adhesive layer 30 is integrally formed with each concave groove 27, the adhesive force between them is high and stable.

  On the other hand, each adhesive layer 30 and the covering material 41 of the reinforcing wire 21 are bonded via, for example, a urethane-based adhesive 42. The average polymerization degree of the vinyl chloride resin of each adhesive layer 30 is determined by the hose wall 20. Since the average polymerization degree of the soft vinyl chloride resin is lower than that of the conventional one in which the covering material 41 of the reinforcing wire 21 is directly bonded to the hose wall 20 by the adhesive 42. The effect can be exhibited satisfactorily and the adhesive force between each adhesive layer 30 and the covering material 41 of the reinforcing wire 21 can be enhanced. Accordingly, the reinforcing wire 21 can be firmly and stably attached to each concave groove 27 of the hose wall 20.

  Further, in this attached state, each reinforcing wire 21 is bonded only to the adhesive layer 30 provided in the vicinity of the bottom of the concave groove 27, so that a minute gap 43 is secured between the reinforcing wire 21 and the concave groove 27. ing. Therefore, the elongation of the hose wall 20 is not easily restricted by the reinforcing wires 21..., And the cleaner hose H with good bending can be obtained.

  Next, the manufacturing method of the cleaner hose H will be described. First, as shown in FIG. 5, the three reinforcing wires 21 are set as a set S, and a predetermined interval W is maintained. Similarly, the winding line is spirally wound with a predetermined distance W maintained.

  Subsequently, using a co-extruder, a hose wall-forming band-like material 50 in which an adhesive layer 30... Is integrally formed at the bottom of the concave grooves 27. The belt-like material 50 has a width corresponding to approximately three pitches of the reinforcing wires 21. Then, in a state where the adhesive 42 is applied to the adhesive layer 30 of the band 50, the band 50 is spirally wound on the reinforcing wire 21, and further the preceding band 50 and the subsequent band The cleaner hose H in which the reinforcing wires 21 are accommodated in the concave grooves 27 of the hose wall 20 by polymerizing or fusing the side edge portions 51 of the 50 with the portions covering the reinforcing wires 21 is obtained. Manufactured. The cleaner hose H manufactured in this way has a structure in which the inner peripheral surface is substantially smooth and has little windage loss.

  When using the cleaner hose H, as shown in FIG. 6, the connecting cylinders 60 and 61 are connected to both ends of the cleaner hose H, and the connecting cylinder 60 on one end side is inserted and connected to the cleaner body 13 side. At the same time, the electric connector 60a is inserted and connected, the connecting cylinder 61 on the other end side is inserted and connected to the operation cylinder 12 side, and the electric connector 61a is inserted and connected simultaneously.

  Thus, by connecting the cleaner body 13 and the operation cylinder 12 via the cleaner hose H, a series of air paths are formed between the cleaner body 13 and the suction nozzle 11. Further, by means of the reinforcing wires 21 functioning as conductive wires, an ON / OFF power supply circuit of the cleaner body 13 and a current path between the power supply of the cleaner body 13 and the motor mounted on the suction nozzle 11 are provided. Is forming.

In addition, this invention is not limited to the said embodiment, Of course, many correction changes can be added to the said embodiment within the scope of this invention .

It is a principal part expanded sectional view of the cleaner hose which concerns on one Embodiment of this invention. It is a side view which shows a vacuum cleaner. It is a partially broken side view of a cleaner hose. It is the expanded sectional view of the hose wall part similarly. It is a figure which shows the manufacturing process typically similarly. It is a side view which shows the state which connected the connection cylinder similarly. It is a partially broken side view of the conventional cleaner hose.

Explanation of symbols

  H. Cleaner hose, 20 ... Hose wall, 21 ... Reinforcing wire, 27 ... Groove (reinforcing wire attachment site), 30 ... Adhesive layer, 40 ... Core material, 41 ... Covering material, 42 ... ·adhesive

Claims (3)

A core material (40) is covered with a covering material (41) made of a hard or semi-rigid vinyl chloride resin having a low degree of polymerization along the inner peripheral surface of a hose wall (20) made of a soft vinyl chloride resin having a high degree of polymerization. A cleaner hose (H) to which a reinforcing wire (21...) Is attached, wherein the hose wall (20) is attached to a reinforcing wire attaching portion (27...) On the inner peripheral surface of the hose wall (20). The average polymerization degree is lower than that of the soft vinyl chloride resin , and the average polymerization degree is higher than that of the hard or semi-rigid vinyl chloride resin of the covering material (41 ··) of the reinforcing wire (21 ··). An adhesive layer (30...) Is integrally formed by coextrusion, and the reinforcing wire (21...) Covering material (21...) Is coated on the adhesive layer (30...) Via a urethane adhesive (42). cleaner, characterized in that bonding the 41 ...) Hose. The average polymerization degree of the soft vinyl chloride resin of the hose wall (20) is 2000 to 4000, and the average polymerization degree of the hard or semi-rigid vinyl chloride resin of the covering material (41 ··) of the reinforcing wire (21 ··) is 800. The cleaner hose according to claim 1 , wherein the average polymerization degree of the vinyl chloride resin of the adhesive layer (30...) Is set in a range of 1000 to 2500 . A concave groove (27...) Is spirally formed along the inner peripheral surface of the hose wall (20), and the adhesive layer (30...) Is provided near the bottom of the concave groove (27. Then, by adhering the covering material (41...) Of the reinforcing wire (21...) To the adhesive layer (30...) Via an adhesive (42), the reinforcing wire (21. The cleaner hose according to claim 1, wherein the cleaner hose is attached in a state of being accommodated in the concave groove (27 .