JP2006183835A - Sleeve for fitting pipe end, and synthetic resin hose in which sleeve is internally mounted - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sleeve for fitting a pipe end capable of being folded with smaller force by lowering elastic resistance generated on a large curved portion in deforming the sleeve including a large diameter portion in a state of being folded small approximately in the heart shape, and keeping its folded state with small force. <P>SOLUTION: This sleeve for fitting the pipe end comprises a cylindrical barrel portion 30 and the large diameter portion 33 projecting from the barrel portion 30 radially outward, three recessed portions 34a, 34b, 34c recessed toward an inner peripheral face side and extending along the axial direction are formed on an outer peripheral face of the large diameter portion 33, and the other two recessed portions 34b, 34c are formed on positions corresponding to two apex portions 36b, 36c of the heart shape when the central recessed portion 34a of the recessed portions 34a, 34b, 34c is press-fitted in the centripetal direction and folded approximately into the heart shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sleeve made of a flexible material for interior of a pipe end of a synthetic resin hose, and more particularly, to a drain of a pipe end of a synthetic resin hose mainly used by being connected to a drain discharge port of an air conditioner. The present invention relates to a sleeve made of a flexible material to be installed in a connection portion with a discharge port. The present invention also relates to a synthetic resin hose in which the sleeve is built.

  As this type of synthetic resin hose, a tube having a bellows-like structure with annular irregularities is generally known in order to provide flexibility. In the case of a drain discharge hose, a two-layer structure in which a heat insulating layer is formed on the outer peripheral surface of such a tube body is generally used. In addition, recently, the use of polyvinyl chloride (PVC) resin, which has a lot of pollution problems, has been eliminated as much as possible as the material of the pipe body. Polyolefin-based materials such as polyethylene (PE) resin and polypropylene (PP) resin can be used as alternative materials. Generally, a resin material is used. The heat insulating layer is usually formed of a foamed resin material. As one means of forming this foam heat insulation layer, the foamed synthetic resin material is cut into a strip of the required width and rolled into a cylindrical shape along the longitudinal direction, and the two side edges are abutted to each other and heat-welded. The heat insulating layer can be formed on the outer periphery of the tubular body by forming the tubular body for the heat insulating coating layer by joining together and inserting or press-fitting the tubular body into the tubular body. This technique has already been proposed by the present applicant. (For example, refer to JP 2000-28082 A)

  The synthetic resin hose having such a structure has a sleeve made of a flexible material excellent in cushioning properties such as rubber, for example, in order to facilitate watertight tight connection to the connecting cylinder of the device. In general, the external fitting connection to the connecting cylinder of the device is easily performed in a watertight manner by utilizing the elastic fastening force of the sleeve. However, if the sleeve has a simple cylindrical body that can be easily inserted into the tube end from the opening, it is difficult to fix the position in the tube, and it is large to ensure the position fixing in the tube. If the shape is provided with a diameter portion, it is difficult to insert the tube into the tube, which is troublesome.

Therefore, as seen in Japanese Patent Application Laid-Open No. 2001-59588, a cylindrical body and a large-diameter flange projecting from the body toward the outer periphery are provided, and the large-diameter flange has an inner periphery. A sleeve having a structure including a recessed portion that is recessed toward the surface side has been developed. The sleeve has a large diameter centered on the recessed portion formed in the large diameter flange portion, while the position of the large diameter flange portion can be securely fixed by fitting the large diameter flange portion into the receiving portion in the tubular body. The entire sleeve, including the flange, is deformed into a substantially heart-shaped small fold and inserted into the tube, so that the tube is extremely easy and quick despite the fact that the sleeve has a large-diameter flange. It has been confirmed that there is an excellent effect that it can be installed in the end.
JP 2000-28082 A JP 2001-59588 A

  However, recently, the thickness of the sleeve has been increased in order to strengthen the connection between the sleeve built in the synthetic resin hose and the connecting cylinder of the device, and to enhance the resistance to deterioration over time due to long-term use of the sleeve. The demand for sleeves is increasing. However, as shown in FIGS. 14 to 16, when the thick sleeve 53 is formed with only one recessed portion 54 in the large-diameter flange portion 53 as in the conventional case, the recessed portion 54 is formed in the radial direction. When the entire sleeve including the large-diameter flange portion 53 is deformed into a substantially heart-shaped small fold shape by being pressed inward and subsequently compressed in the centripetal direction from both sides, A large elastic resistance is generated at the two heart-shaped top portions 56b and 56c, so that the sleeve 5 cannot be folded into a substantially heart shape, or it can be folded into a substantially heart shape. In order to maintain a small folded state, a problem that a large clamping pressure must be continuously applied from the left and right sides of the sleeve 5 has been discovered. In any case, in the production of the synthetic resin hose with the sleeve installed therein, it took a great deal of labor and time to fold the sleeve small and install it in the hose.

  Accordingly, the present invention provides a sleeve having a cylindrical body and a large-diameter part protruding radially outward from the body, and the entire sleeve including the large-diameter part is reduced to a substantially heart shape. Provided is a sleeve for fitting a tube end, which can be folded with a smaller force while maintaining the folded state with a smaller force by reducing the elastic resistance generated in the large bending portion when deformed into a folded shape. Is.

  The configuration of the present invention taken in order to solve this problem will be described with reference to the reference numerals used in the drawings showing the embodiments. The present invention includes a cylindrical body 30 and a radially outer portion from the body 30. A large-diameter portion 33 projecting toward the direction, and three recessed portions 34a, 34b extending along the axial direction recessed toward the inner peripheral surface side on the outer peripheral surface of the large-diameter portion 33, 34c, and among these recessed portions 34a, 34b, 34c, when the central recessed portion 34a is press-fitted in the centripetal direction and folded into a substantially heart shape, the positions corresponding to the two top portions 36b, 36c of the heart shape In addition, a tube end fitting sleeve made of a flexible material in which two other recessed portions 34b and 34c are formed.

  Another embodiment of the present invention is a synthetic resin hose in which a tube end fitting sleeve having such a configuration is internally provided.

  The present invention is provided with three recessed portions extending along the axial direction recessed toward the inner peripheral surface side on the outer peripheral surface of the large diameter portion of the sleeve, and among these recessed portions, the central recessed portion is provided. When the entire sleeve including the large-diameter part is deformed into a small heart shape by being pressed in the centripetal direction and compressed in the centripetal direction from both sides, the central indentation becomes the heart-shaped indentation. Since the other two recessed portions are positioned at the two top portions of the heart shape, and the positions corresponding to the heart-shaped indented portion and the two top portions are thin portions, respectively, the sleeve is The elastic resistance generated in each of the large curved portions of the heart-shaped indented portion and the two top portions is reduced as it is folded into a heart shape, and even if it has a thick large-diameter portion, it is small. It quickly deforms into a fold shape with force, and with a small force While maintaining the folded state to the easy, it is possible to quickly interior into the hose. As a result, the working efficiency of the process of mounting the sleeve on the hose is greatly improved, and a remarkable effect that the productivity of the hose can be increased has been obtained.

  In carrying out the tube end fitting sleeve according to the present invention having such a configuration, as a material for forming the sleeve 3 in the above configuration, rubber, that is, natural rubber or synthetic rubber, or a soft elastic material having a high elastic restoring force can be used. A synthetic resin, a synthetic material with rubber, or the like can be used. In addition, the concave portions 34a, 34b, 34c formed in the large diameter portion 33 of the sleeve 3 and the concave portions 34d described later are substantially semi-circular, U-shaped, U-shaped, Although it can be implemented in a substantially V-shape or other appropriate shape, and is not limited, the recessed portion 34a is formed on the recessed portion 34a in the centripetal direction so that the sleeve can be deformed into a small folded shape. When pressed and compressed in both the centripetal direction from both sides, the outer peripheral surfaces 32a and 32b of the large-diameter portion 33 connected to the recessed portion 34a are preferably formed so that they can contact each other with a small force. It is preferable to carry out at the optimum groove depth and groove width that can be realized. Further, when the recessed portions 34b and 34c are formed at a phase position of approximately 65 ° to 75 ° in the left and right circumferential directions from the recessed portion 34a, the sleeve is folded into the smallest and most compact heart shape that is most easily installed in the hose. be able to. Further, when the embodiment further includes a recessed portion 34d extending along the axial direction recessed toward the inner peripheral surface at a 180 ° angle phase position in the circumferential direction from the recessed portion 34a, the sleeve is formed into a heart shape. The elastic resistance generated at the position corresponding to the heart-shaped bottom portion 36d of the outer peripheral surface of the large-diameter portion 33 as it is deformed into a folded shape is reduced, the sleeve is easily deformed into a folded shape with a smaller force, and the folded state is Can be maintained.

  On the other hand, in the synthetic resin hose in which the tube end fitting sleeve having the above-described configuration, which is another embodiment of the present invention, is incorporated, the configuration of the synthetic resin hose is not limited. If it mentions, it will connect and use to the drain outlet of an air conditioner, Comprising: The pipe | tube main body 1 and the cylindrical synthetic resin heat insulation layer 2 are provided so that the outer peripheral surface of the pipe | tube main body 1 may be covered. It can be implemented as a drain hose having a configuration.

  The configuration of the tube body 1 will be described in more detail as an example. The tube body 1 includes a connecting tubular portion 12 having an outer diameter fitted into the tubular portion 13 on the other end side in the longitudinal direction. An annular ridge 11 projecting in the outer circumferential direction over the entire length excluding only the tubular portion 13 or the tubular portion 13 and the connecting tubular portion 12 on the other end side. It can be implemented as a flexible tube formed.

  In addition, as the synthetic resin material constituting the heat insulating layer 2, a closed cell foam can be used as a material that can prevent water penetration and enhance the heat insulating effect. Moreover, it can implement as the outer peripheral surface of the heat insulation layer 2 being covered with the synthetic resin film-like outer skin layer. Furthermore, the surface of the foam or the outer surface of the outer skin layer covered with the foam is subjected to embossing or microscopic treatment so that wrinkles and bent wrinkles generated at the bent piping portion of the hose are not noticeable. It can be carried out assuming that the concavo-convex pattern 22 is given. The foamed synthetic resin sheet material thus formed can be cut into a strip shape, and the side edges 21 in the longitudinal direction are joined together to form a cylindrical shape.

  Embodiments of the present invention will be described below together with illustrated examples. FIG. 1 to FIG. 10 are views showing a first embodiment of a sleeve for fitting a pipe end according to the present invention and a synthetic resin hose in which the sleeve is fitted, FIG. 1 is a perspective view of the sleeve, and FIG. 3 is a side view of the upper half of the sleeve, FIG. 4 and FIG. 5 are side views of the flange side showing the small deformation of the sleeve, and FIG. 6 is a state where the hose is connected to the drain outlet. FIG. 7 is a front view of the upper half of the hose before the sleeve is installed in the hose, and FIG. 8 is a view of the main part before the hose is connected to the drain outlet. 9 is a front view of the upper half of the upper half, FIG. 9 is a front view of the upper half of the upper half showing the main part in the middle of connecting the hose to the drain outlet, and FIG. 10 is a state after connecting the hose to the drain outlet. The upper half longitudinal section front view which shows the principal part is shown.

  The pipe end fitting sleeve 3 (hereinafter referred to as the sleeve 3) of the first embodiment shown in FIGS. 1 to 5 is internally provided at the pipe end of the synthetic resin drain hose H connected to the drain outlet D of the air conditioner. And connected to the drain outlet D.

  As shown in FIGS. 1 and 2, the sleeve 3 is a short cylinder formed of a material rich in elasticity such as rubber or a non-chlorine resin material such as a thermoplastic elastomer such as TPE or TPR. And a large-diameter portion 33 that protrudes radially outward from the outer peripheral surface 32 side on one end side. As shown in FIG. 3, an engagement protrusion 35 that protrudes inward in the radial direction from the inner peripheral surface 31 side is formed in a range in which the large diameter portion 33 is formed in the axial direction. The engagement protrusion 35 has a three-step difference from the opening end 14 side and a one-step difference from the inner back side.

  As shown in FIGS. 1 and 2, the outer circumferential surface of the large-diameter portion 33 is a groove extending along the axial direction recessed inward in the radial direction, and the opening portion opens outwardly in a side view. The concave U-shaped recessed portion 34 a has a length extending over the entire axial direction of the large-diameter portion 33, and the depth of the recessed groove in which the recessed bottom portion 37 substantially coincides with the outer peripheral surface 32 of the trunk portion 30. Is formed. Further, grooves extending along the axial direction that are recessed inward in the radial direction from the recessed portion 34a to the approximately 70 ° angular phase position in the left-right circumferential direction, respectively, and are formed in a semicircular arc-shaped recessed portion 34b, The insertion portion 34 c is formed with a length extending over the entire axial direction of the large diameter portion 33. The recessed portion 34a is formed such that both the depth of the recessed groove and the recessed groove width are larger than those of the recessed portion 34b and the recessed portion 34c.

  Thus, the large-diameter portion 33 formed on the sleeve 3 is fitted in the annular protrusion 17 that is built in the tube body 1 of the hose H and forms the space a in the tube body 1. However, it is formed to have a larger diameter than the opening end 14 of the tube main body 1, and a normal large diameter portion having a width radially outward cannot be fitted into the space a. However, since the large diameter portion 33 according to the present invention is formed with three recessed portions 34a, 34b, 34c extending along the axial direction recessed radially inward, as shown in FIG. As shown in FIG. 5, first, the concave portion 34a is press-fitted in the centripetal direction, and subsequently compressed in both the centripetal directions as shown in FIG. 5, and the large-diameter portion 33 connected from the concave portion 34a. The outer peripheral surfaces 32a and 32b are brought into contact with each other so that the formation portion of the recessed portion 34a is a heart-shaped indented portion 36a, and the formed portions of the recessed portions 34b and 34c are the two heart-shaped top portions 36b and 36c. The entire sleeve 3 including the portion 33 can be deformed into a substantially heart shape.

  The depth and width of the groove of the recessed portion 34a are not only larger than those of the recessed portion 34b and the recessed portion 34c, but are press-fitted onto the recessed portion 34a in the centripetal direction, and from both sides. When compressing in the centripetal direction, for example, as shown in the reference diagram of FIG. 13, the side grooves 38a, 38b or the opening edges 39a, 39b of the recessed portion 34a collide with each other to compress from both sides in the centripetal direction. As shown in FIG. 5, the large-diameter portion 33 connected to the recessed portion 34a with the side grooves 38a and 38b of the recessed portion 34a facing the elongated thin recessed portion 37 as shown in FIG. In order to realize a state in which the outer peripheral surfaces 32a and 32b are in contact with each other, the recessed portion 34a itself is formed with a necessary and sufficient groove depth and groove width.

  Thus, by making the sleeve 3 into a small deformation state, the tube body 1 can be inserted from the open end 14 thereof. Thus, as shown in FIG. 8, the sleeve 3 has a body portion 33 of the sleeve 3 as a cylindrical portion 13 of the tube body 1 described later, and a large diameter portion 33 of the tube body 1 as described later. The space a formed by the portion 17 is used in an interior.

  Next, the drain hose H in which the sleeve having such a structure is built will be described. The drain hose H of the first embodiment is an air conditioning drain hose H connected to a drain outlet D of an air conditioner, and includes a pipe body 1, a heat insulating layer 2 covering the outer peripheral surface of the pipe body 1, and a pipe. It consists of three members with the sleeve 3 of the above-mentioned structure built in the pipe end of the main body 1. The tube main body 1 is formed into a seamless tubular shape with polyethylene resin by a well-known blow molding method, and is a tubular shape to which a sleeve 3 is attached and externally connected to a drain outlet D of an air conditioner. The portion 13 is provided on one end side, and the other connecting side tubular portion 12 is provided on the other end side. And between these both cylindrical parts 12 and 13, it is set as the structure which has formed the cyclic | annular protrusion 11 which protrudes to radial direction outward over substantially full length, As a tubular body provided with flexibility as a whole is there.

  Thus, the tubular portion 13 on the side attached to the device is formed to have a larger diameter than the outer diameter of the drain outlet D of the air conditioner, and toward the radially outer side near the opening end 14 thereof. An annular ridge portion 17 that protrudes to form the space a is formed. In addition to being able to receive the large-diameter portion 33 of the sleeve 3, the space a formed by the protrusion 17 has an engagement protrusion 35 when the drain hose H is connected to the drain outlet D as will be described later. It is the structure which can carry out the expansion displacement of the trunk | drum 30 of the formation location of diametrically outward. Further, two annular protrusions 19a projecting radially inward are formed at positions slightly on the tube inner side from the ridge 17 of the drain hose H, and of the two annular protrusions 19a, on the tube inner side. When the drain hose H is externally fitted to the drain discharge port D, the depth from the tip end side of the projection P of the drain discharge port D is deeper than that of the tube end side. Each annular projection 19 can be pressed against the body 30 of the sleeve 3 that is clamped along the inclined side surface where the diameter gradually increases toward the side.

  When the axial width of the large-diameter portion 33 is W1 and the inner width in the axial direction of the ridge 17 is W2, W2> When the outer diameter of the large-diameter portion 33 is R1 and the inner diameter of the protrusion 17 is R2, the trunk portion 30 where the engaging protrusion 35 and the large-diameter portion 33 are formed is radially formed. It is formed by the relationship of R2> R1 so that it can be displaced outward.

  The heat insulating layer 2 is formed by using a band-shaped material obtained by cutting a closed-cell foamed resin sheet material to a required width, and heat-melting the side edges 21 and 21 in the longitudinal direction to bring them into contact with each other. It is formed in a shape. The annular groove 23 formed in the outer peripheral surface of the heat insulation layer 2 shown in the upper part of FIG. 6 is for facilitating the bending of the heat insulation layer 2. The tube main body 1 is pushed into the heat insulating layer 2 formed in a cylindrical shape in this way from its open end, and a double cylinder is formed as seen in FIG.

  As shown in the upper part of FIG. 6, the heat insulating layer 2 shown in this embodiment has a fine uneven pattern 22 formed on the outer surface of the heat insulating layer 2. This pattern 22 can be patterned by passing a foamed resin material that forms a heat-insulating cylindrical body between heated and pressed rolls having an appropriate uneven pattern formed on the surface. In this way, by providing a pattern on the surface of the heat insulating layer 2, it is possible to prevent the wrinkles and bent wrinkles generated on the side of the hose from being reduced when the hose is packed or bent. The aesthetics of the entire hose can be maintained. Although not shown in the figure, the heat insulating layer 2 is formed with a skin layer in which, for example, a PE resin film having a thickness of about 100 μm is heated and pressure-bonded for the purpose of enhancing the weather resistance of the heat insulating material and preventing aged deterioration. By using a certain material, the heat insulating layer 2 having an outer skin layer can be implemented.

  As shown in FIG. 8, the drain hose H of the present embodiment having such a structure is connected by press-fitting externally into a drain discharge port D protruding from the wall surface F of the internal device in the air conditioner. To do. The drain outlet D is formed with a protrusion P having a shape that is squeezed radially inward after the diameter gradually increases from the tip toward the back. Then, as shown in FIG. 9, when the connection, the projection P of the drain discharge port D passes through the innermost projecting portion of the engagement projection 35 of the sleeve 3, and the projection P of the drain discharge port D is connected to this portion. When a force that spreads outward in the radial direction is exerted by this, the thin body portion 30 of the sleeve 3 located at the position where the annular projection 19 is formed with the annular projection 19 as a support shaft is expanded and displaced radially outward. Accordingly, the body portion 30 of the sleeve 3 where the engaging protrusion 35 and the large diameter portion 33 are formed is also displaced into the space a formed by the protrusion 17. Then, as shown in FIG. 10, the step portion on the inner back side of the engagement protrusion 35 and the protrusion P of the drain discharge port D are engaged, and the sleeve 3 is fixed on the drain discharge port D. The connection between the drain hose H and the drain outlet D is completed.

  After the connection is completed, the step portion on the inner back side of the engagement protrusion 35 is engaged with the protrusion P of the drain discharge port D, and the engagement protrusion 35 of the sleeve 3 and the body portion 30 of the thin portion are connected. Even if the sleeve 3 does not come off from the drain discharge port D by being pinched at the drain discharge port D, and the tube body 1 is slightly deteriorated with time, the elastic pinching force against the sleeve 3 is reduced. Since the protrusion 17 is fitted to the large-diameter portion 33 of the sleeve 3, the movement of the tube body 1 from the sleeve 3 is prevented from moving out, and as a result, the hose H is spilled out of the drain discharge port D. There is nothing to do. In addition, the two annular projections 19a formed so that the projecting width of the tube rear side is larger than that of the tube end side, the diameter gradually increases from the front end side of the drain discharge port D toward the back side. The water-tightness of the connection part of the drain hose H and the drain outlet D is ensured by press-contacting with respect to the trunk | drum 30 of the thin part of the sleeve 3 clamped along the inclined side surface.

  11 and 12 show a second embodiment of the tube end fitting sleeve according to the present invention. As shown in FIG. 11, in addition to the configuration of the tube end fitting sleeve of the first embodiment, a concave portion is provided. When the large-diameter portion 33 is folded into a substantially heart shape in the circumferential direction from the insertion portion 34a to the 180 ° angle phase position, the inner diameter is positioned at the position corresponding to the heart-shaped bottom portion 36d on the outer peripheral surface of the large-diameter portion 33. The configuration further includes a recessed portion 34d extending along the axial direction recessed toward the circumferential surface side. The recessed portion 34d has the same shape as the recessed portion 34b and the recessed portion 34c.

  Thus, as shown in FIG. 12, the large-diameter portion that is first press-fitted onto the recessed portion 34a in the centripetal direction indicated by the arrow, and subsequently compressed in the centripetal direction from both sides, and connected from the recessed portion 34a. The outer peripheral surfaces 32a and 32b of 33 are brought into contact with each other, the formation portion of the recessed portion 34a is used as a heart-shaped indentation center, and the formation portions of the recessed portions 34b and 34c are used as two heart-shaped top portions 36b and 36c. Then, the entire portion of the sleeve 3 including the large-diameter portion 33 can be deformed into a substantially heart shape by using the heart-shaped bottom portion 36d as the formation portion of the recessed portion 34d.

  Although the embodiment considered to be a representative example of the present invention has been described above, the present invention is not limited only to the above-described embodiment, and includes the above-described configuration requirements according to the present invention and refers to the present invention. The present invention can be carried out with appropriate modifications within the scope of achieving the object and having the effects referred to in the present invention.

  The tube end fitting sleeve according to the present invention and the synthetic resin hose in which the tube end fitting sleeve is built are scheduled to be mass-produced in the future for connection to a drain outlet of an air conditioner, but are not limited to this and are used in various applications. It is applicable to.

The perspective view of the sleeve for pipe end fitting of 1st Example. The side view of the flange side of the sleeve. The upper half longitudinal section front view of the sleeve. The side view on the flange side which shows the small deformation action of the sleeve. The side view on the flange side which shows the small deformation action of the sleeve. The upper half longitudinal section front view showing the state of the hose after the connection. The upper half longitudinal front view which shows the principal part of the hose before making the sleeve interior. The upper half longitudinal section front view which shows the principal part of the state before the connection. The upper half vertical front view which shows the principal part of the state in the middle of the connection. The upper half longitudinal section front view which shows the principal part of the state after the connection. The right view of the sleeve of 2nd Example. The right side view on the flange side which shows the small deformation action of the sleeve. The reference figure which shows the small deformation action of a sleeve. The perspective view of the sleeve of a prior art example. The right view of the sleeve. The right side view on the flange side which shows the small deformation action of the sleeve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe | tube main body 11 Annular ridge 12 Connecting cylindrical part 13 Cylindrical part 14 Open end 17 ridge part 19 Annular protrusion 2 Heat insulation layer 21 Side edge part 22 Uneven pattern 23 Annular groove 3 Sleeve 30 Body 31 Inner peripheral surface 32 Outer peripheral surface 32a Outer peripheral surface 32b connected from the recessed portion 34a Outer peripheral surface connected from the recessed portion 34a 33 Large diameter portion 34a Recessed portion 34b Recessed portion 34c Recessed portion 34d Recessed portion 35 Engaging protrusion 36a Recessed portion 36b Top portion 36c Bottom portion 36d Bottom portion 36d Bottom portion 36d Bottom portion 38a, 38b Side groove 39a, 39b Opening edge a Space D Drain discharge port P Protrusion

Claims (5)

  A cylindrical body (30) and a large diameter part (33) projecting radially outward from the body (30), and on the outer peripheral surface of the large diameter part (33), Three recessed portions (34a), (34b), (34c) extending along the axial direction recessed toward the inner peripheral surface side are provided, and each of these recessed portions (34a), (34b), (34c) Of these, when the central recess (34a) is press-fitted in the centripetal direction and folded into a substantially heart shape, the other two recesses (2) are located at the positions corresponding to the two top portions (36b) and (36c) of the heart shape ( 34b), (34c) A tube end fitting sleeve made of a flexible material.   The recessed portion (34a) is an outer peripheral surface of the large-diameter portion (33) connected from the recessed portion (34a) when the recessed portion (34a) is press-fitted on the recessed portion (34a) in the centripetal direction and compressed from both sides. 2. The tube end fitting sleeve according to claim 1, wherein the sleeve is formed in a shape in which (32a) and (32b) can come into contact with each other.   3. The pipe end fitting according to claim 1, wherein the recessed portions (34 b) and (34 c) are formed at a phase position of approximately 65 ° to 75 ° in the left and right circumferential directions from the central recessed portion (34 a). Sleeve.   The dent part (34d) further extending along the axial direction dented toward the inner peripheral surface at a 180 ° angle phase position in the circumferential direction from the dent part (34a). A tube-end fitting sleeve according to claim 1.   A synthetic resin hose in which the sleeve for fitting a pipe end according to any one of claims 1 to 4 is fitted into the pipe end.

Images