JPS6237555Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a suction hose for a vacuum cleaner.

(Prior art) As a suction hose for a vacuum cleaner, a reinforcing wire such as a piano wire is wound in a spiral shape, and a synthetic resin tape is wound in a spiral manner so that both ends overlap on the outer periphery of the reinforcing wire. A flexible synthetic resin pipe (see Japanese Utility Model Publication No. 5173/1973) in which synthetic resin tapes are welded together has been used in the past.

Furthermore, in many suction hoses, both ends of the synthetic resin tape are overlapped in the valleys between the reinforcing wires.

(Problem that the invention attempts to solve) However, in the conventional suction hose, the 9th
As shown in the figure, since the side edges of the synthetic resin tape B overlap on the outer periphery of the reinforcing wire A, the wall thickness of this part T
is significantly thicker than the wall thickness t of other parts,
When the synthetic resin tape B has one layer, it is about twice as much, and even when it has two layers, it is about 1.5 times as much. Therefore, the wall thickness changes suddenly at the boundary C between the thick wall portion where the side edges of the synthetic resin tape B overlap and the other thin wall portion, and this boundary C is located on both sides of the reinforcing line A. Since the suction hose is located in a part where bending stress is likely to be applied when the hose is bent, the bending stress acts intensively on this part, which tends to cause cuts and shorten the life of the suction hose. In addition, the edge D of the side end of the synthetic resin tape B located inside the hose is not welded to the synthetic resin tape B and protrudes into the hose, which vibrates due to the suction air flow and generates noise. There was a problem that the suction air flow became turbulent and the suction resistance increased. Furthermore, even in a suction hose that overlaps in the valleys between reinforcing wires, the boundaries between the thick overlapped parts and other thin walled parts are located on both sides of the reinforcing wires, and the overlapped parts in the valleys do not deform. Therefore, bending stress was more likely to be concentrated at the boundary than in the above case, and cuts were more likely to occur.

(Means for Solving the Problems) In order to solve the conventional problems, the present invention uses a synthetic resin tape having a width approximately equal to multiple pitches of the reinforcing wires, and the side ends of the synthetic resin tapes overlap the reinforcing wires. The synthetic resin tape is wrapped in three layers on the outer periphery and two layers on the other parts, and the both ends of this synthetic resin tape are made thinner toward the side edges so that the three-layer part has almost the same thickness as the second-layer part. On the other hand, the 2-3 layer resin part on the outer periphery of the reinforcing wire and the 2-layer resin part between the reinforcing wires are integrally welded and joined without any gaps, and the connecting resin part between these two resin parts is joined in a non-welded manner. To provide a suction hose for a vacuum cleaner that leaves a surface intact.

(Function) According to the suction hose having such a configuration, the wall thickness of the hose is uniform on both sides of the reinforcing wire, so that
Even when the hose is bent, stress concentration does not occur, resulting in a long service life, and since the side ends of the synthetic resin tape do not protrude into the hose, there is no noise or increase in suction resistance. Furthermore, since the part where the side edges of the synthetic resin tape are polymerized is three layers, and the other parts are two layers, there is a possibility that the side edges of the synthetic resin tape may peel off due to incomplete welding. Even if there is a problem, the function as a suction hose will not be impaired because there is an intermediate portion of the synthetic resin tape inside.

(Description of an Embodiment) Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 6. In Figures 1 to 3, 1 is a suction hose for a vacuum cleaner, and two reinforcing wires 2a, 2 are made of strong and conductive material such as piano wire or steel wire.
b is wound in a double spiral, and these reinforcing wires 2a, 2b
A synthetic resin tape 3 having a width approximately twice the winding pitch of each reinforcing wire 2a, 2b is placed around the outer periphery of the reinforcing wire 2.
It is constructed by welding the polymerized synthetic resin tapes 3 to each other by spirally wrapping them at the same pitch as a and 2b. To explain in detail, the synthetic resin tape 3
are the five reinforcing wire peaks 2a, 2b, 2a, 2b,
It has a width of 2a, and its both side ends 3
A and 3b are wound on the outer periphery of the reinforcing wire 2a on both sides at the winding pitch of the reinforcing wire 2a in a superimposed state. Therefore, the synthetic resin tape 3 is reinforced with the reinforcing wire 2a.
There are three layers on the outer periphery of the reinforcing wire 2b, and two layers on the other parts including the outer periphery of the reinforcing wire 2b. As shown in FIGS. 1 and 4, both end portions 3a and 3b of the synthetic resin tape 3 are thinner toward the edges, and the synthetic resin tape 3 on the outer periphery of the reinforcing wire 2a is The thickness T of the three-layered portion is also approximately equal to the thickness t of the other two-layered portion. Therefore, the wall thickness of the hose wall formed of the synthetic resin tape 3 is uniform over the entire length, and the outer diameter of the ridge portion formed by the reinforcing wire 2a of which the synthetic resin tape 3 is made of three layers is also the same as that of the synthetic resin tape. 3 is approximately the same as the outer diameter of the peak portion formed by the two-layer reinforcing wire 2b. In addition, in this way, both side ends 3a of the synthetic resin tape 3,
When 3b is made thinner, when extrusion molding this synthetic resin tape 3, the flow of the resin becomes slower at both side ends 3a and 3b as shown by the arrows in FIG.
Since the tension increases in inverse proportion to this, both ends 3a of the synthetic resin tape 3 on the outer periphery of the reinforcing wire 2a,
3b is strongly tightened, and the overlapping portion is firmly fixed. Further, the width of the synthetic resin tape 3 is precisely regulated so that both end portions 3a and 3b thereof are located half around the outer circumference of the reinforcing wire 2a, and the side edges are inserted into the suction hose 1 with tongue pieces. It is made so that it does not protrude.

According to the above configuration, since the thickness of the hose wall made of synthetic resin tape is uniform on both sides of the reinforcing wires 2a and 2b, concentrated stress does not act even if the suction hose is bent. Furthermore, the side ends of the synthetic resin tape do not protrude into the suction hose, causing noise or increased suction resistance. Furthermore, since the two reinforcing wires 2a and 2b are wound in a double spiral, by passing electricity through them, the reinforcing wires 2a and 2b can be used for wiring the hand switch without separately arranging conductive wires. In addition, since the synthetic resin tape 3 is made of two layers and the overlapping parts at both ends are made of three layers, there is no risk of intake air leaking from the overlapping parts, and moreover, there is no risk of air leakage from the overlapping parts, and furthermore, there is no risk of air leakage from the overlapping parts. The diameters are almost the same, so there is no problem with connection.

In addition, when the synthetic resin tape 3 is made into a single layer, if there is even a slight imperfection in welding at the overlapping parts on both sides, air leakage will occur, and the bending resistance is also very poor and will tear in a short period of time. That is, the reinforcing wires 2a, 2
b The resin part connecting the 2nd to 3rd layer resin part on the outer periphery and the 2nd layer resin part between the reinforcing wires 2a and 2b is the reinforcing wire 2a, 2
Since the welding to b acts to stretch when bending, the two-layer resin part between reinforcing wires 2a and 2b is bent at an acute angle when bending, and this part becomes fatigued and breaks in an extremely short period of time. .

On the other hand, by having multiple layers, it is possible to eliminate intake air leakage, and in a state of having multiple layers, the two to three layer resin portions on the outer periphery of the reinforcing wires 2a, 2b,
By integrally welding and joining the two-layer resin part between the reinforcing wires 2a and 2b without any gaps, and by leaving a non-welded mating surface 4 on the connecting resin part between the two resin parts, a non-welded state can be achieved when bending. As shown in FIG. 6, the sliding occurs on the mating surface 4, and the bending can be done extremely smoothly and without sharp bends, resulting in a long life.

In addition, when the two-layer resin part between the reinforcing wires 2a and 2b is made of two or more layers, for example, three layers, two non-welded mating surfaces 4, 4 are formed in the connecting resin part, which requires flexibility. The problem arises that when bent, an acute bend is formed as shown in FIG. 7, and the bend is easily cut from this point. Therefore, it is an important requirement that the synthetic resin tape 3 has two layers.

Furthermore, in the above embodiment, two conductive reinforcing wires 2a and 2b are wound in a double spiral, but if a hand switch is not provided or if a conductive wire is placed separately, A non-conductive reinforcing wire such as a hard synthetic resin can be used, and one reinforcing wire 2 can be spirally wound as shown in FIG.
A synthetic resin tape 3 having a width approximately twice the winding pitch may be spirally wound at the same pitch as the reinforcing wire 2.

(Effect of the invention) According to the suction hose for a vacuum cleaner of the invention, as is clear from the above explanation, the wall thickness of the hose is uniform on both sides of the reinforcing wire, so even if the hose is bent. No stress concentration occurs, resulting in long life. Also,
Since the side edges of the synthetic resin tape do not protrude into the hose, tongues that vibrate with the suction airflow do not protrude into the suction hose, which may cause noise or increase suction resistance. Nor. Furthermore, since the overlapping part at the side edge of the synthetic resin tape is 3 layers, and the rest is 2 layers, in the unlikely event that some parts of the synthetic resin tape peel off due to incomplete welding, There is also no fear of air intake leakage. In addition, the 2-3 layer resin part around the outer circumference of the reinforcing wire and the 2-layer resin part between the reinforcing wires are integrally welded and joined without any gaps, and
By leaving a non-welded mating surface on the connecting resin part between both resin parts, the bending resistance of the hose can be increased. For example, a normal hose that does not have a non-welded mating surface can be bent around 50,000 times. However, this invention was able to withstand 400,000 bending tests, significantly extending its lifespan. Moreover, even if the reinforcing wire is wound in a double spiral, so that three layers of overlapping parts appear every other layer on the reinforcing wire, all the outer diameters are the same, so the appearance may be damaged or other There is no problem in connecting with other parts.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of the main part of an embodiment of the present invention, Fig. 2 is a front view of the partial external appearance, Fig. 3 is an explanatory diagram showing the polymerization state of the synthetic resin tape, and Fig. 4 is an illustration of the synthetic resin tape. 5 is a plan view of the synthetic resin tape, FIG. 6 is an explanatory diagram of the action when the suction hose is bent, FIG. 7 is an explanatory diagram of the action similar to FIG. 6 for a comparative example, and FIG. 9 is an explanatory view similar to FIG. 3 of another embodiment, and FIG. 9 is a sectional view similar to FIG. 1 of the conventional example. 1... Suction hose, 2, 2a, 2b... Reinforcement wire, 3... Synthetic resin tape, 3a, 3b... Both ends.

Claims (1)

[Scope of utility model registration request] A synthetic resin tape having a width approximately equal to a plurality of pitches of the reinforcing wire is spirally wound and welded around the outer periphery of the spirally wound reinforcing wire, and at the time of wrapping, both ends of the tape are sequentially polymerized and welded. In the vacuum cleaner suction hose made of
Two layers are stacked between the reinforcing wires, and both ends of this synthetic resin tape are made thinner toward the side edges, so that the third layer has approximately the same thickness as the second layer.
2 to 3 layers of resin on the outer periphery of the reinforcing wire and 2 between the reinforcing wire
A suction hose for a vacuum cleaner, characterized in that a layer resin part is integrally welded and joined without a gap, and a non-welded mating surface is left in the connecting resin part between the two resin parts.