JP2012251584A - Vent member of hose and method of manufacturing hose assembly having vent member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vent member 1 of a simple structure that improves spread of a molding resin in an insert molding process, and prevents molding failure of a connection part, thereby enhancing manufacturing efficiency and quality of a hose assembly.SOLUTION: This vent member 1 is integrally connected to an end part of a flexible hose 2. At one end of the vent member 1, a storage part 12 is provided for forming a ring-shaped space S for storing a hose end part to be connected. The storage part 12 is constituted of an inner cylinder part 13, an outer cylinder part 14 and a rising part 15. A part near the rising part 15 is cut out in a predetermined part in the peripheral direction. The storage part 12 is provided with a projection 17 for preventing an end part of a hose 1 from coming into contact with the rising part, and the projection 17 is arranged in a cut position of the storage part. The vent member 1 is integrally connected to the hose 2 by so-called insert molding.

Description

The present invention relates to a mouth member connected and integrated with an end portion of a flexible hose, and a method of manufacturing a hose assembly in which a flexible hose and a mouth member are integrated. In particular, the present invention relates to a mouth member suitable for connection and integration of an end of a flexible hose and a mouth member using synthetic resin injection molding, and a method of manufacturing a hose assembly.

Flexible hoses are used in various applications such as vacuum cleaners, suction devices, and drainage facilities. If the mouth member is integrated with the end portion of the hose body of the flexible hose, it is possible to connect the hose using the mouth member, which is convenient. In recent years, in an integrated technology of a flexible hose and a mouth member, by using an injection molding technology called so-called overmolding or insert molding, a ready-made mouth member is inserted into the hose body end of the flexible hose, A technique is used in which a part and a mouth member are introduced into an injection mold to perform resin injection molding, and the hose body end and the mouth member are integrated by the injected resin.

For example, in Patent Document 1, in applying the overmolding technology (insert molding technology) to a flexible hose having a spiral concavo-convex strip, the mouth member is composed of an inner member and an outer member, A technique is disclosed in which an outer member is provided with a spiral protrusion that is screwed with a concave and convex portion of a hose, and the axial position of the end portion of the hose body is adjusted by rotation of the outer member to be used for injection molding. According to this technique, it is possible to prevent a gap from occurring between the hose end and the inner member, and to prevent a problem that the resin injected in the insert molding process leaks into the hose. Has been.

JP 2009-250273 A

In the technique disclosed in Patent Document 1, since the mouth member is composed of a total of three members, it is preferable to further simplify the structure of the mouth member to reduce the manufacturing cost and increase the manufacturing efficiency.

The inventors studied simplification of the mouth member, and studied to integrate the integrated mouth member 9 as shown in FIG. That is, the end portion of the hose 2 is inserted into a hose housing portion 92 provided in the mouth member, and so-called insert molding is performed by injecting resin from the resin injection port 99 into a gap between the hose end and the housing portion. Thus, an attempt was made to connect and integrate the hose 2 and the mouth member 9. However, if the resin is injected in a state where the hose 2 is pushed to the innermost part of the hose accommodating portion 92, the resin does not move well in the circumferential direction, and a molding defect that cannot be successfully connected and integrated with the mouth member is likely to occur. It has been found.

In addition, in order to secure a ring-shaped space near the end of the inserted hose and improve the circumferential wrapping of the resin, excessive insertion of the hose is restricted to the back of the housing portion 92 of the mouth member. We also considered adding a restricting member, but the structure of the mold that molds the mouth member becomes very complicated, or the restricting member itself blocks the flow of resin, so an insertion restricting member is simply added. It was found that it was difficult to spread the resin well in the insert molding process.

An object of the present invention is to provide a mouth member that can improve the sneak in the molding resin in the insert molding process and prevent the molding failure of the connecting portion while having a simple structure. The purpose is to increase the manufacturing efficiency and quality of the hose assembly using the members.

As a result of intensive studies, the inventor can solve the above problem by providing a notch portion at a specific position of the hose accommodating portion of the mouth member and arranging a protrusion that restricts excessive insertion of the hose in the notch portion. As a result, the present invention has been completed.

The present invention is a mouth member that is connected and integrated with a flexible hose end, and the mouth member is a member formed by resin injection molding, and at one end of the mouth member, a hose end to be connected An accommodating portion that defines a ring-shaped space for accommodating the portion is provided, and the accommodating portion includes an inner cylindrical portion, an outer cylindrical portion, and a rising portion, and the inner cylindrical portion is disposed on the inner peripheral side of the space. It is a cylindrical part, the outer cylinder part is a cylindrical part arranged on the outer peripheral side of the space, the rising part is arranged on the center side in the axial direction of the mouth member of the space, and the inner cylinder part and the outer cylinder Is a hollow disk-shaped part that connects the parts to each other, and the housing part is provided with a protrusion that prevents the hose end from contacting the rising part,
The accommodating portion has a rising portion and / or a portion near the rising portion cut out at a predetermined portion in the circumferential direction, and the protrusion is a mouth member provided at a position where the accommodating portion is cut out ( First invention).

In the present invention, as long as the end of the hose and the protrusion come into contact with each other to prevent excessive insertion of the hose, the protrusion can be a protrusion having various shapes such as a pin shape and a plate shape.

In addition, as for the form in which the accommodating part is cut out in a partial region in the circumferential direction, only the rising part may be cut out, or it is continuously cut out from the rising part to the inner cylinder part and the outer cylinder part. Alternatively, only the inner cylinder part and the outer cylinder part may be cut out in the vicinity of the rising part without cutting out the rising part.

In the mouth member of the first invention, it is preferable that the rising portion of the accommodating portion is further cut out, and a protrusion is provided at the center in the circumferential direction at the position where the raised portion is cut out (second invention).

Moreover, this invention is a manufacturing method of the hose assembly which integrated the mouth member of 1st invention with the flexible hose, Comprising: The 1st process which inserts a hose end into the accommodating part of a mouth member, A hose end, The second step of introducing the mouth member into the injection mold, closing the die with the hose end in contact with the protrusion, and forming the cavity, injecting resin into the cavity, It is a manufacturing method of a hose assembly provided with the 3rd process integrated with the resin which inject | emitted the hose end part (3rd invention).

Furthermore, in the hose assembly manufacturing method according to the third aspect of the present invention, it is preferable to inject the resin from the gate disposed at the position where the accommodating portion of the mouth member is cut out (fourth aspect). In the hose assembly manufacturing method according to the third aspect of the invention, the hose assembly is further configured to include an electric wire inserted into the hose, and in the first step, the electric wire is routed through the portion where the lip member is cut. It is preferable to pull out to the outside of the member and to fill the notch with the resin injected in the third step and fix the electric wire to the mouth member (fifth invention).

According to the lip member of the present invention (first invention), the number of parts of the lip member is reduced compared to the technique disclosed in Patent Document 1, and the lip member is configured with a simple component structure. Further, if the hose assembly is configured using the mouth member of the first invention, the injected resin can be smoothly wound in the circumferential direction in the insert molding process when the hose and the mouth member are connected and integrated. Molding defects are prevented.

Further, as in the second invention, when the rising portion of the housing portion is cut out and a protrusion is provided at the center in the circumferential direction at the position where the rising portion is cut out, the injected resin is better wraparound. However, the axial dimension of the lip member can be further shortened, and an effect that the designability and design flexibility of the hose lip portion can be improved is also obtained.

Furthermore, if the mouth member of the first invention is used for the manufacture of the hose assembly as in the third invention and the connection and integration is made utilizing so-called insert molding, the structure of the mouth member is simple, so the hose And the process of assembling the mouthpiece are simplified, and the manufacturing efficiency of the hose assembly is increased. Further, the hose end portion can be accurately positioned by simply pushing the hose into the housing portion of the mouthpiece member, molding defects in the insert molding process can be prevented, and the quality of the hose assembly can be improved.

Moreover, when it is set as the manufacturing method of 4th invention, the manufacturing efficiency of a hose assembly is further improved, and when it is set as the manufacturing method of 5th invention, the fixation of the electric wire to a lip member can also be performed simultaneously, The production efficiency of the hose assembly is further increased.

It is a figure which shows the external appearance of the vacuum cleaner in which the mouth member which concerns on this invention was used. It is a perspective view which shows the external appearance shape of the mouth member of 1st Embodiment of this invention. It is sectional drawing and the front view which show the shape of the mouth member of 1st Embodiment of this invention. It is a perspective view which shows the state which inserted the hose edge part in the opening | mouth member concerning this invention. It is a perspective view which shows the hose assembly which connected and integrated the mouth member and hose concerning this invention by insert molding. It is a schematic diagram which shows the outline | summary of the insert molding process for obtaining the hose assembly which connected and integrated the mouth member and hose end part concerning this invention. It is a schematic diagram which shows the flow of the injection resin in the periphery of a protrusion and a notch part in the mouth member of 1st Embodiment of this invention. In 2nd Embodiment of this invention, it is a perspective view which shows the state which inserted the hose edge part into the opening | mouth member and pulled out the electric wire. It is the perspective view and sectional drawing which show the shape of the mouth member of 3rd Embodiment of this invention. It is the perspective view and sectional drawing which show the shape of the opening | mouth member of 4th Embodiment of this invention. It is a partial cross section figure which shows the structure of the connection part of the opening | mouth member and hose end part of the comparative examination example.

Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the individual embodiments shown below, and can be carried out by changing the form.
As a first embodiment, an embodiment in a flexible hose connection part of a vacuum cleaner will be described as an example. FIG. 1 shows the overall appearance of a vacuum cleaner, and a flexible hose 2 is connected to an air inlet provided in a vacuum cleaner body 40 via a connecting pipe (mouth member) 1 at one end of the hose 2. The other end of 2 is connected to the hand operating section 42, and the extension pipe 43 and then the floor nozzle 44 are connected to the hand operating section 42 to constitute a vacuum cleaner.

In the present embodiment, the connecting tube 1 is connected and integrated with the flexible hose 2 as a mouth member, and the hose 2 and the mouth member 1 constitute a hose assembly. Here, the mouth member is a member that is connected to and integrated with the end portion of the hose and used for connection with other members, and particularly a member having a hollow cylindrical portion at the connection portion with the hose. . In the example of the electric vacuum cleaner, the connecting pipe 1 or a member directly connected to the hose among the constituent members of the hand operation unit corresponds to the mouth member. Hereinafter, the first embodiment of the present invention will be described in detail with respect to the flexible hose 2, the mouth member 1, and the connection structure thereof.

FIG. 2 is a perspective view showing the external shape of the mouth member in the present embodiment. FIG. 3 is a cross-sectional view showing the shape of the mouthpiece member 1 of the present embodiment and a front view seen from the central axis direction. As shown in FIG. 4, the end portion of the hose 2 is inserted into and connected to the mouth end member 1 at one end side thereof. In this state, it is subjected to an insert molding process to be described later, and both are connected and integrated to form a hose assembly in which the hose 2 and the mouthpiece member 1 are connected and integrated as shown in FIG.

The hose body 2 is a flexible hose made of a synthetic resin (for example, made of a soft thermoplastic resin), for example, a hose having spiral or ring-shaped protrusions 21 and 21 on the outer periphery or inner periphery. In the present embodiment, the hose wall of the hose body 2 is formed in a bellows shape having spiral concavo-convex ridges, and the concavo-convex ridges of the hose wall are the ridges 21 on the hose outer peripheral surface as they are.
Such a hose is manufactured by, for example, a so-called spiral method in which resin strips having a substantially S-shaped cross section are spirally wound, and the adjacent side portions of adjacent strips are bonded and integrated, or a continuous blow molding method. can do. In the present invention, the specific form and material of the hose are not particularly limited.

The soft synthetic resin constituting the hose body 2 is not particularly limited, but a relatively soft thermoplastic resin capable of obtaining the flexibility of the hose can be used. In particular, a soft vinyl chloride resin (PVC resin), Examples thereof include ethylene vinyl acetate resin (EVA resin), low density polyethylene resin (LDPE), polypropylene resin (PP), and thermoplastic elastomer (TPE).

The mouth member 1 of the present embodiment is a hollow cylindrical member integrally formed by synthetic resin injection molding. One end side of the mouth member 1 is, for example, an insertion portion 11 and is used for connection to the vacuum cleaner body 40 and other members. The end on this side can be in any form as required. For example, a case of the hand operation unit 42 may be formed.

A housing portion 12 is provided on the other end side of the mouth member. The accommodating portion 12 defines a ring-shaped space S in which the end portion of the hose 2 to be connected can be inserted and accommodated, and the end portion 1 and the hose are inserted into the ring-shaped space S by inserting the hose end portion. 2 are connected to each other. Specifically, the accommodating part 12 includes an inner cylinder part 13, an outer cylinder part 14, and a rising part 15. The housing portion 12 may be provided with a protrusion, a claw, a protrusion, a slit, a hole, an opening, or the like as required for engagement.

The inner cylinder portion 13 is a hollow cylindrical portion disposed on the inner peripheral side of the ring-shaped space S. The outer cylindrical portion 14 is a hollow cylindrical portion disposed on the outer peripheral side of the ring-shaped space S, and the space between the inner cylindrical portion 13 and the outer cylindrical portion 14 becomes the ring-shaped space S. The rising portion 15 is a hollow disk-shaped portion extending in the radial direction of the mouth member so as to connect the inner cylindrical portion 13 and the outer cylindrical portion 14 to each other. It is arrange | positioned with respect to the cylinder part 14 at the center side by the mouth member axial direction. Accordingly, the accommodating portion 12 is configured so that the ring-shaped space S is opened toward the other end side of the mouthpiece member 1.

Further, the accommodating portion 12 is provided with a protrusion 17. The protrusion 17 is provided so as to protrude toward the ring-shaped space S at a position on the side (left side in the cross-sectional view of FIG. 3) where the accommodating portion is open in the axial direction of the mouth member from the rising portion 15. Yes. In this embodiment, the two protrusions 17 are provided at positions that are symmetrical in the circumferential direction. In the present embodiment, the protrusion 17 is provided in a prismatic shape.

When the hose 2 is inserted into the ring-shaped space S of the housing portion 12, the insertion of the hose 2 stops at a position where the protrusion 17 and the hose end abut, and the hose end directly abuts the rising portion 15. Is prevented. That is, even when the hose 2 is fully inserted, the protrusion 17 prevents the hose end portion and the rising portion 15 from coming into contact, and a substantially ring-shaped space C is formed between the hose end portion and the rising portion 15. Will be left behind. In FIG. 3, the hose end portion inserted into the accommodating portion 12 is indicated by a dotted line, the hose end portion abuts against the protrusion 17 (cross section XX in FIG. 3), and a space C remains between the rising portion 15. (O—Y cross section and O—Z cross section in FIG. 3).

The protrusion 17 can be formed in various forms such as a pin shape and a plate shape as long as it can abut against the hose end portion and prevent excessive insertion of the hose. Further, the protrusion can be provided so as to protrude from either the inner cylinder part 13 or the outer cylinder part 14 as necessary. Or the protrusion 17 can also be provided so that between the inner cylinder part 13 and the outer cylinder part 14 may be connected like this embodiment. A typical radial height of the protrusion is, for example, 1/5 to 1/1 of a radial distance between the inner cylinder portion 13 and the outer cylinder portion 14.

Further, the accommodating portion 12 is formed in a shape in which the rising portion 15 and the inner cylindrical portion 13 and / or the outer cylindrical portion 14 in the vicinity of the rising portion are cut out in a partial region in the circumferential direction. In the present embodiment, at the position where the rising portion 15 is divided into four equal parts in the circumferential direction, it is cut out to a predetermined size, more specifically, the same length as the protrusion or a wider width in the circumferential direction length. It is. Typically, the circumferential length of each notch is about 1/20 to 1/4 of the circumferential length of the accommodating portion. In the notched portion, the inside of the accommodating portion 12 (that is, the ring-shaped space S) and the outer space of the mouth member 1 communicate with each other through the window-shaped notched portion.

This notch part can also be provided so that it may be continuously notched to the inner cylinder part 13 and the outer cylinder part 14, like other embodiment mentioned later. Further, the rising portion 15 can be provided so that only the inner cylindrical portion 13 and the outer cylindrical portion 14 are notched in the vicinity of the rising portion without being cut out.

In the present embodiment, the cutouts are formed at 4 points of the protrusions 17 as viewed along the axial direction of the mouth member at four locations in the circumferential direction so as to mainly cut out the rising portion 15 and the outer cylinder portion 14. The width is about double.

Furthermore, the protrusion 17 is provided in the position where the accommodating part 12 was notched in the circumferential direction of the mouth member. Accordingly, the protrusion 17 is arranged at the portion where the accommodating portion 12 is cut out in a window shape so that the protrusion 17 is exposed to the outside of the mouth member. Since the projection 17 is provided at the position where the housing portion is notched, the structure of the mold when the mouth member 1 is formed by resin injection molding is simplified, and the number of parts of the mouth member is reduced ( In this embodiment, the mouth member can be a one-piece structure), the mouth member can be made compact, and the mouth member can be efficiently manufactured by resin injection molding. In the present embodiment, the protrusions 17 are provided at two locations, but may be provided at all locations where there are notches.

As a material constituting the mouth member 1, a relatively hard synthetic resin can be used as compared with the constituent material of the hose 2, and in particular, a thermoplastic resin such as polypropylene resin (PP), polyamide resin (PA), acrylonitrile butadiene styrene resin. (ABS resin) or the like can be suitably used, and a thermosetting resin material such as a rubber material or a reaction curable resin material such as a urethane resin can also be used. Since the hose body 2 and the mouth member 1 are integrated using insert injection molding as will be described later, the material of these members is a material having good adhesion and compatibility with the resin material used for insert injection molding. It is preferable to select from.

Next, a manufacturing method in which the mouth member 1 and the hose 2 are connected and integrated by so-called insert injection molding to obtain a hose assembly as shown in FIG. 5 will be described.

Prior to the insert molding step, the mouth member 1 and the hose 2 are each manufactured in advance.

As shown in FIGS. 6A and 6B, the end portion of the hose 2 is inserted into the ring-shaped space S of the housing portion 12 of the mouthpiece member 1. Then, the hose 2 is inserted until the end of the hose contacts the protrusion 17. Even in this state, a space C exists between the hose end portion and the rising portion 15 as shown in the OY cross section and the OZ cross section of FIG. Since the end of the hose can be pushed into contact with the protrusion 17 and used for the insertion process, the insertion length of the hose is stabilized, and as a result, the quality of the obtained hose assembly is improved.

With the end of the hose inserted into the mouthpiece member accommodating portion, the hose end is set inside the insert molding die. The mold M for insert molding accommodates the hose 2 and the mouth member 1 so as to obtain a predetermined hose assembly shape (shown in FIG. 5), and can form a cavity filled with the injected resin. This is a mold for resin injection molding. You may make it provide the core metal mold | die inserted inside the hose 2 or the mouth member 1 as needed.

The hose end and the mouth member 1 are set in the mold M and clamped to inject the resin. In the present embodiment, the resin is injected through the gate G that opens to the portion where the mouth member is cut out. In addition, you may make it inject | pour resin from other site | parts, such as the hole for injection | pouring provided in the mouth member outer cylinder part 14, as needed.

Although it is not essential to provide the gate G in the part where the mouth member is cut out, if the gate G is provided in the part where the mouth member is cut out, the structure of the housing portion 12 can be made with very simple parts and molds. Since the resin can be injected inside, the manufacturing can be performed efficiently.

Although FIG. 6 illustrates an example in which the gate is provided at the notch position where the protrusion 17 is provided, the gate may be provided at the notch position where the protrusion is not provided.

The molten resin injected from the gate G reaches the inside of the accommodating portion 12 through the window-shaped notch, fills the gap between the hose end and the accommodating portion 12, and the resin is solidified. And the housing part (mouth member) are joined and integrated. Further, the injected resin P is filled so as to fill a notch portion provided in the housing portion 12, and the notch is eliminated in the completed hose assembly (FIG. 5).

When solidification of the injected resin P is completed, the mold M is opened and the hose assembly in which the hose 2 and the mouth member 1 are integrated is taken out of the mold (FIG. 6D), and the insert molding process is performed. Complete.

When the mouth member 1 of the present invention is used for insert molding with a hose, even if the hose end portion is pushed into the mouth member housing portion to the full, a space is formed between the hose end portion and the mouth member rising portion 15 by the action of the protrusion 17. C is left. Therefore, the injected resin moves through the space C in the circumferential direction of the lip member, and the resin wraps well to the opposite side of the gate. And hose can be integrated.

Further, in the mouth member 1 of the present invention, since the protrusion 17 is provided at the position where the housing portion is cut out, the resin made of the resin that goes around through the space C between the hose end portion and the mouth member rising portion 15 is provided. The protrusion 17 and the cutout shape can be determined so that the flow is not blocked by the protrusion 17 and the resin can bypass the protrusion 17.

For example, in this embodiment, as shown in FIG. 6C, the protrusion 17 and the rising portion 15 are provided at positions where they are aligned with no gap as seen in a cross section along the axial direction of the mouth member. However, since the rising portion 15 is notched, and the protrusion 17 is disposed at substantially the center of the notch, as shown in FIG. It flows from the space C between the rising portions 15 to the portion where the rising portions 15 are cut out, and then flows into the space C again. FIG. 7 shows an enlarged perspective view of the notch and the protrusion, and shows an example in which the resin flows from the left front side to the right back side. Thus, if the protrusion 17 is provided in the notch portion, the injected resin can bypass the protrusion 17 and easily flow around in the circumferential direction.

Therefore, according to the present invention, the injected resin moves in the circumferential direction of the lip member, or the resin wraps well to the opposite side of the gate, thereby preventing a molding defect from occurring while preventing the molding failure. The member and hose can be integrated.

In particular, as in the present embodiment, when the rising portion 15 is notched and the protrusion 17 having a width smaller than the notch is provided at the center of the portion where the rising portion is notched, the resin has no protrusion. 17, it flows in the axial direction of the mouth member once toward the portion where the rising portion is cut out, and flows to the opposite side of the protrusion 17 through the portion where the rising portion is cut out. Even when the rising portion 15 and the protrusion 17 are disposed without a gap (as shown in FIG. 6C), the resin can flow around the protrusion 17. Accordingly, the rising portion 15 and the protrusion 17 can be arranged close to each other in the mouth member axial direction, and the dimension in the mouth member axial direction can be further shortened. Since the mouth member can be configured in a compact manner, the design and design freedom of the hose mouth portion can be increased.

The present invention is not limited to the above embodiment, and can be implemented with various modifications. Other embodiments of the present invention will be described below. However, in the following description, portions different from the above embodiment will be mainly described, and detailed descriptions of the same portions will be omitted. Further, the embodiments described below can be implemented by combining some of them or replacing some of them.

FIG. 8 shows a second embodiment. In the present embodiment, the electric wire 5 is inserted into the hose 2. The electric wire 5 is drawn out from the inside of the hose 2 to the outside of the mouth member 6 through the notched portion of the mouth member 6. Specifically, in the present embodiment, the mouth member is cut from the rising portion 65 to the inner peripheral portion 63, and the electric wire 5 inserted into the hose passes through the window-shaped cutout portion of the inner peripheral portion 63. It is pulled out of the member (FIG. 8). In this state, the hose 2, the mouth member 6 and the electric wire 5 are subjected to insert molding and integrated.

The resin injected in the insert molding step integrates the hose and the mouth member and fills the notch portion to fill the periphery of the electric wire, so that not only the hose but also the electric wire is fixed to the mouth member. If it does in this way, the electric wire penetrated in the hose can be fixed to a mouth member, using a mouth member of simple composition.

FIG. 9 is a perspective view and a cross-sectional view showing the external shape of the mouth member 7 in the third embodiment of the present invention. This embodiment differs in the form of a notch and the form of a protrusion compared with the mouth member of 1st Embodiment. In the present embodiment, a notch is provided so as to straddle the outer cylinder portion 74 and the rising portion 75 of the housing portion. And the outer cylinder part 14 is cut off to such an extent that the protrusion 77 is exposed seeing from the radial direction of a lip member.

In the present embodiment, the protrusion 77 is provided in a pin shape that protrudes radially outward from the inner cylinder portion 73. Further, when viewed in a cross-section including the axis of the mouth member (the cross-sectional view on the right side of FIG. 9), the protrusion 77 is provided at a position spaced apart from the rising portion 75 in the axial direction by a predetermined distance.

Even in this embodiment, as in the first embodiment, the resin injected in the insert molding process at the time of manufacturing the hose assembly is promoted to circulate in the circumferential direction, thereby preventing the occurrence of molding defects. The
In the present embodiment, when the injected resin hits the protrusion 77 when it circulates in the circumferential direction, the resin is separated from the gap between the protrusion 77 and the rising portion 75, the cutout portion of the rising portion 75, or the outer cylinder portion. It can be distributed to 74 cutouts and bypassed. Therefore, the protrusion 77 is less likely to inhibit the resin wraparound.

FIG. 10 is a perspective view and a cross-sectional view showing the external shape of the mouth member 8 according to the fourth embodiment of the present invention. This embodiment also differs in the form of a notch and the form of a protrusion compared with the mouth member of other embodiments. In the present embodiment, a cutout is provided only in the outer cylinder portion 84 of the housing portion. And the outer cylinder part 84 is cut off to such an extent that the protrusion 87 is exposed seeing from the radial direction of a lip member.

In the present embodiment, the protrusion 87 is provided in a prismatic shape protruding from the inner cylinder portion 83 toward the radially outer side. Further, when viewed in a cross section including the axis of the mouth member (a cross sectional view on the right side of FIG. 10), the protrusion 87 is provided at a position spaced apart from the rising portion 85 in the axial direction by a predetermined distance.

Even in this embodiment, as in the first embodiment, the resin injected in the insert molding process at the time of manufacturing the hose assembly is promoted to circulate in the circumferential direction, thereby preventing the occurrence of molding defects. The
In the present embodiment, when the injected resin hits the protrusion 87 when it circulates in the circumferential direction, the resin is dispersed in the gap between the protrusion 87 and the rising portion 85 and the cutout portion of the outer cylinder portion 84. Thus, the protrusion 87 can be bypassed. Therefore, it becomes difficult for the protrusions 87 to inhibit the wraparound of the resin.

Although the said embodiment demonstrated the hose assembly applied to a vacuum cleaner as an example, this invention is other technical fields other than having demonstrated in the said embodiment, for example, fields, such as a suction hose and an industrial hose, etc. Can also be widely applied.

INDUSTRIAL APPLICABILITY The present invention can be used as a technique for joining and integrating a mouth member to the end of a flexible hose, and has high industrial utility value.

1 Mouth member (connection pipe)
DESCRIPTION OF SYMBOLS 11 Insertion part 12 Accommodating part 13 Inner cylinder part 14 Outer cylinder part 15 Standing part S Ring-shaped space 17 Protrusion 2 Hose 21 Projection M Insert injection mold 5 Electric wire 6, 7, 8 Mouth members 63, 73, 83 Inner cylinder Portions 64, 74, 84 Outer cylinder portions 65, 75, 85 Rising portions 67, 77, 87 Projections

Claims (5)

A mouth member connected and integrated to the flexible hose end,
The lip member is a member formed by resin injection molding,
One end of the mouth member is provided with a housing portion that defines a ring-shaped space that houses a hose end portion to be connected,
The accommodating part is configured to include an inner cylinder part, an outer cylinder part, and a rising part,
An inner cylinder part is a cylindrical part arrange | positioned at the inner peripheral side of the said space,
The outer cylinder part is a cylindrical part arranged on the outer peripheral side of the space,
The rising portion is a hollow disk-shaped portion that is arranged on the center side in the axial direction of the mouth member of the space and connects the inner tube portion and the outer tube portion to each other,
The housing is provided with a protrusion that prevents the end of the hose from coming into contact with the rising portion,
The accommodating portion has a rising portion and / or a portion near the rising portion cut out at a predetermined portion in the circumferential direction,
The protrusion is a mouth member provided at a position where the accommodating portion is cut out. The mouth member according to claim 1, wherein the rising portion of the housing portion is cut out, and a protrusion is provided at a circumferential central portion at a position where the rising portion is cut out. A manufacturing method of a hose assembly in which the mouth member according to claim 1 is integrated with a flexible hose,
A first step of inserting the hose end into the receptacle of the mouthpiece member,
A second step of introducing the hose end and the mouth member into the injection mold and closing the mold in a state where the hose end is in contact with the projection to form a cavity;
Including a third step of injecting resin into the cavity and integrating the housing portion of the mouth member and the hose end portion with the injected resin;
A method for manufacturing a hose assembly. The method for manufacturing a hose assembly according to claim 3, wherein, in the third step, the resin is injected from a gate disposed at a position where the receiving portion of the mouth member is cut out. The hose assembly includes an electric wire inserted into the hose. In the first step, the hose assembly pulls out the electric wire to the outside of the lip member through the portion where the lip member is cut, and the resin is injected in the third step. The method for manufacturing a hose assembly according to claim 3, wherein the notch is filled and the electric wire is fixed to the mouth member.

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