Mechanism for attaching and detaching the cover member of the inner container and the outer container

Abstract

To provide an attaching / detaching mechanism which hardly generates a rattle between a cover member and an outer container.SOLUTION: There is provided an attaching / detaching mechanism between a cover member 2 and an outer container 40. A cover peripheral wall 4 provided on the cover member 2 is fitted to an inner surface of a fitting cylinder part 46 which is an upper part of a cylindrical peripheral wall 44 of the outer container 40. An engaging lateral groove 48 which extends peripherally is provided on one surface between the inner surface of the fitting cylinder part 46 and an outer surface of the cover peripheral wall 4, and an engaging projection part 10 in a lateral rib shape which is added to the other surface is fitted in the engaging lateral groove 48. A receiving groove 14 is formed in a length-directional part of the engaging projection part 10, and a locking projection 50 for holding in the receiving groove 14 is formed in a length-directional part of the engaging lateral groove 48. Through rotation of the cover member 2, a tip part 16 of the engaging projection part 10 inserted into the engaging lateral groove 48 gets over the locking projection 50. Stopper means S consisting of the receiving groove 14 and locking projection 50 damps rotation of the cylindrical peripheral wall 44 on the cover peripheral wall 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an attachment / detachment mechanism for an inner container cover member and an outer container, specifically, to an attachment / detachment mechanism for a cover member to be attached to the mouth and neck of an inner container and an outer container for housing the body of the inner container. [Background technology]

[0002] One known attachment / detachment mechanism of this type is one in which the outer peripheral wall of a cover member is rotatably fitted onto the inner surface of the upper part of the cylindrical peripheral wall of the outer container, and a plurality of engaging ridges are isometrically arranged on the inner surface of the cylindrical peripheral wall, running inclined along a multi-threaded helical trajectory, and the outer surface of the outer peripheral wall is provided with a climbing rib (lower rib) for sliding against the underside of the engaging ridge, and an auxiliary rib (upper rib) for sliding against the upper side of the engaging ridge (Patent Document 1). The auxiliary rib is shorter than the climbing-over rib and is provided so that the engaging protrusion is temporarily clamped between the climbing-over rib and the auxiliary rib when the cover member is rotated in the opening direction. When the engaging protrusion rides up onto the climbing rib, the cover member is pulled up relative to the outer container, and the fitted state between the two is released. Furthermore, by rotating the cover member, the auxiliary rib slides out from the upper surface of the engaging ridge, and the base end of the auxiliary rib (the end opposite the direction of rotation) comes into contact with the tip end (the end in the direction of rotation) of the engaging ridge so as to be caught. These two ends have a rounded tapered shape when viewed from the side, and the outer container is locked to the cover member by the abutment of the ends. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6576296 Summary of the Invention [Problem to be solved by the invention]

[0004] The attachment / detachment mechanism of Patent Document 1 has a climb-over structure in which the engagement ridges of the cover member are sandwiched vertically between a lower rib and an upper rib, so even slight dimensional variations have a significant effect on the opening and closing torque. Furthermore, since the engagement of the outer container with the cover member is achieved by the abutment of the tapered surfaces of the tip end of the engaging protrusion and the base end of the auxiliary rib, variations in torque and dimensions can change the positional relationship, easily causing play in the rotational and vertical directions.

[0005] A first object of the present invention is to provide an attachment / detachment mechanism that is less likely to cause rattling between the cover member and the outer container. A second object of the present invention is to provide an attachment / detachment mechanism in which the opening and closing torque is less susceptible to the effects of dimensional variations. [Means for solving the problem]

[0006] The first means is a mechanism for attaching and detaching the outer container 40 to the cover member 2 attached to the inner container, The cover peripheral wall 4 provided on the cover member 2 is fitted to the inner surface of a fitting cylindrical portion 46 which is an upper portion of a cylindrical peripheral wall 44 of the outer container 40, The inner surface of the fitting cylinder portion 46 To A circumferentially extending engagement groove 48 is provided. At the same time , The outer surface of the cover peripheral wall 4 The engaging protrusion 10 attached to the engaging member 44 is fitted into the engaging lateral groove 48. The engaging protrusion 10 is formed on a transverse rib, and a receiving groove 14 is provided in a part of the longitudinal direction of the transverse rib to separate a base portion 12 and a tip portion 16 of the transverse rib. A locking projection 50 is provided in a portion of the longitudinal direction of the engagement lateral groove 48. By rotating the cover member 2 relative to the outer container 40, the tip 16 of the engaging protrusion 10 inserted into the horizontal engaging groove 48 passes over the locking projection 50 and is fitted into the horizontal groove portion 48b further forward than the locking projection 50, and the locking projection 50 is sandwiched within the receiving groove 14. In this sandwiched state, a stopper means S formed by the receiving groove 14 and the locking projection 50 brakes the rotation of the cylindrical peripheral wall 44 relative to the cover peripheral wall 4. And, A thick-walled portion 46b is formed in a part of the circumferential direction of the fitting cylinder portion 46, and a thin-walled portion 46a is formed on both sides of the thick-walled portion 46b, the thin-walled portion 46a being recessed in the radial direction. The engagement lateral groove 48 is provided in the thick-walled portion 46b so as to extend from one side surface f1 to the other side surface f2 in the circumferential direction of the thick-walled portion 46b, A locking rib 18 is provided on the outer surface of the cover peripheral wall 4 to come into contact with the inner surface of the thick portion 46b at a suitable position. .

[0007] In this embodiment, as shown in FIG. 1, the inner surface of the fitting cylinder portion 46 To , a circumferentially extending engagement groove 48 is provided, On the outer surface of the cover peripheral wall 4 The attached engaging protrusion 10 is fitted into the engaging lateral groove 48 as shown in FIG. The engaging protrusion 10 is formed on a transverse rib, and a receiving groove 14 is provided in part of the longitudinal direction of the transverse rib to separate the base 12 and tip 16 of the transverse rib, and a locking protrusion 50 is attached within part of the longitudinal direction of the engaging transverse groove 48. 1, the locking projection 50 is sandwiched within the receiving groove 14. The receiving groove 14 and the locking projection 50 form a stopper means S, which is provided to brake the rotation of the cylinder peripheral wall 44 relative to the cover peripheral wall 4. According to this structure, rattling of the outer container 40 in the rotational direction can be reduced. In order to realize the clamped state of the locking protrusion 50, the cover member 2 is rotated so that the locking protrusion enters the locking horizontal groove 48 as shown in Figures 7(B) to 7(C), and the tip 16 of the locking protrusion 10 overcomes the locking protrusion 50 as shown in Figure 7(D). 7 is a panoramic view of the inner structure of the fitting tube portion 46 in order to explain the functions of the horizontal engagement groove 48 and the engagement protrusion 10. With this structure, dimensional variations are unlikely to affect the magnitude of the opening and closing torque. In this embodiment, as shown in FIG. 6, a thick portion 46b is formed in a part of the circumferential direction of the fitting cylindrical portion 46, and thin portions 46a recessed in the radial direction are formed on both sides of this thick portion 46b. The engagement lateral groove 48 is provided in the thick-walled portion 46b so as to extend from one side surface f1 to the other side surface f2 in the circumferential direction of the thick-walled portion 46b. Further, on the outer surface of the cover peripheral wall 4, there is provided a locking rib 18 which is brought into contact with the inner surface of the thick portion 46b at a suitable position. According to this structure, the frictional force caused by the contact between the thick portion 46b and the locking rib 18 can further reduce rattling of the outer container 40 in the circumferential direction.

[0008] The second means includes the first means, and a flange portion 6 is attached to the outer surface of the cover peripheral wall 4, The above Cover member 2 The above When the outer container 40 is attached to the outer container 40, the flange portion 6 The above Against the upper end surface side of the fitting cylinder portion 46, The above The engaging projections 10 are provided so as to abut against the upper side surfaces US of the engaging lateral grooves 48, respectively.

[0009] In this means, as shown in FIG. 1, a flange portion 6 is attached to the outer surface of the cover peripheral wall 4, and is arranged so that when the cover member 2 is attached to the outer container 40, the flange portion 6 abuts against the upper end surface side of the fitting cylindrical portion 46, and the engaging protrusion 10 abuts against the upper side surface US of the engaging horizontal groove 48. According to this structure, the portion between the upper end face of the fitting tube portion 40 and the upper side surface US can be sandwiched between the flange portion 6 and the engagement projection 10, thereby reducing rattling of the outer container 40 in the vertical direction.

[0012] No. 3 The first method is Or the second method and an annular flange portion 6 is provided on the outer surface of the cover peripheral wall 4, When the cylinder peripheral wall 44 is fitted to the cover peripheral wall 4, the engaging protrusion 10 is positioned so that when the upper end surface of the cylinder peripheral wall 44 is abutted against the flange portion 6, the engaging protrusion 10 is positioned at the same height as the engaging horizontal groove 48.

[0013] In this means, as shown in FIG. 1, an annular flange 6 is provided on the outer surface of the peripheral cover wall 4 . Furthermore, when the cylinder peripheral wall 44 is fitted to the cover peripheral wall 4, the engaging protrusion 10 is positioned at the same height as the engaging horizontal groove 48 when the upper end surface of the cylinder peripheral wall 44 is abutted against the flange portion 6 (see Figure 7 (B)). According to this structure, the positioning of the engaging projection 10 can be easily performed. Effect of the Invention

[0014] According to the present invention, it is possible to provide an attachment / detachment mechanism that is less likely to cause rattling between the cover member and the outer container. Furthermore, according to the present invention, the opening and closing torque can be made less susceptible to the effects of dimensional variations. [Brief description of the drawings]

[0015] [Figure 1] 1A and 1B are diagrams showing an embodiment in which the attachment / detachment mechanism of the present invention is applied to a double container including an inner container and an outer container. [Diagram 2] FIG. 2 is an enlarged view of the attachment / detachment mechanism shown in FIG. 1, where FIG. 2(A) is a cross-sectional view seen from above, and FIG. 2(B) is a vertical cross-sectional view seen from the direction II(B)-II(B) of FIG. 2(A). [Diagram 3] 2A and 2B are diagrams showing the structure of a cover member shown in the embodiment of FIG. 1, in which FIG. 2A is a side view and FIG. 2B is a bottom view. [Figure 4] FIG. 4 is a perspective view of the cover member of FIG. [Diagram 5] 5A and 5B are diagrams showing the structure of the outer container shown in the embodiment of FIG. 1, in which FIG. 5A is a plan view and FIG. 5B is a cross-sectional view seen from the V(B)-V(B) direction of FIG. 5A. [Figure 6] FIG. 6 is a perspective view of a main part of the outer container shown in FIG. 5. [Figure 7] FIG. 2 is a panoramic development of the fitting tube, showing the operation of the attachment / detachment mechanism of FIG. 1. FIG. 2(A) shows the stage before the engagement protrusion is inserted into the gap between the thin-walled portion and the cover peripheral wall, FIG. 2(B) shows the stage after the engagement protrusion has been inserted into the gap, FIG. 2(C) shows the stage when the tip of the engagement protrusion abuts against the locking protrusion of the engagement horizontal groove, and FIG. 2(D) shows the stage when the tip of the engagement protrusion has overcome the locking protrusion. BEST MODE FOR CARRYING OUT THEINVENTION

[0016] 1 to 7 show an embodiment in which the mechanism for attaching and detaching the cover member of the inner container to the outer container of the present invention is applied to a double container (replaceable container) including an inner container and an outer container. It should be noted that the expression "cover member of the inner container" includes a cover member that is a separate member independent of the inner container. In Fig. 1, 100 denotes an inner container having a mouth and neck portion 102, 110 denotes a dispenser attached inside the mouth and neck portion 102, and 112 denotes a nozzle head of the dispenser having a nozzle 114. 120 denotes an overcap. Reference numeral 2 denotes a cover member attached to the outer surface of the mouth / neck portion 102, and 40 denotes an outer container for housing the body portion of the inner container. 1, the cover member 2 has an inward flange 20 protruding from the upper end of the cover peripheral wall 4, and a mounting tube portion 22 that screws into the neck portion 102 is vertically provided from the lower surface of the inward flange 20. A guide tube portion 24 for guiding the nozzle head 112 stands upright from the upper surface of the inward flange 20. The lower portion of the overcap 120 is fitted into the upper half portion 4a of the cover peripheral wall 4. The outer container 40 has a cylindrical peripheral wall 44 standing from the peripheral end of the bottom wall portion 42, and the lower half 4b of the cover peripheral wall 4 is fitted into the inner surface of a fitting cylindrical portion 46 which is the upper portion of the cylindrical peripheral wall 44. A cross-sectional view of this fitting portion is shown in Fig. 2(A). Note that the cylindrical peripheral wall 44 may be provided with a positioning recess 52 for printing, as shown by imaginary lines in Fig. 2(A).

[0017] The attachment / detachment mechanism A for the cover member 2 and the outer container 40 of the inner container 100 of the present invention is formed between the cover peripheral wall 4 on the cover member 2 side and the fitting tubular portion 46 on the outer container 40 side. 1, the attachment / detachment mechanism A includes a circumferentially extending engagement lateral groove 48 provided on the inner surface of the fitting tubular portion 46, and an L-shaped engagement protrusion 8 provided on the outer surface of the cover peripheral wall 4. The engagement protrusion 8 is made up of a vertical rib 9 and an engagement protrusion 10 which is a horizontal rib, and is formed so that the engagement protrusion 10 can be fitted into the engagement lateral groove 48. However, the vertical rib 9 may be omitted. The engaging protrusion 10 is provided so as to be insertable into and removable from the engaging lateral groove 48 by rotating the cover member 2 relative to the outer container 40. This will be described later. Although not shown, a horizontal engaging groove 48 may be provided on the outer surface of the cover peripheral wall 4, and an engaging protrusion 8 may be attached to the inner surface of the fitting cylinder portion 46.

[0018] In this embodiment, a plurality of (two in the illustrated example) engaging protrusions 8 are formed equiangularly in the circumferential direction of the cover peripheral wall 4, as shown in FIG. 3(B). The engaging protrusions 10 of the engaging projections 8 extend from the lower ends of the vertical ribs 9 in the same circumferential direction (counterclockwise as viewed from below in the illustrated example). In the illustrated example, as shown in Fig. 3(A), an annular flange 6 is provided on the outer surface of the cover peripheral wall 4, connected to the upper end of the vertical rib 9. When the outer container 40 is attached to the cover member 2, this flange 6 abuts against the upper end surface of the cylindrical peripheral wall 44 (an upward step 45, described later, in the illustrated example) as shown in Fig. 2(B). As shown in FIG. 4, a locking rib 18 is provided on the outer surface of the cover peripheral wall 4, positioned on an extension line of the engaging protrusion 10 extending circumferentially from the vertical rib 9, for abutting against the thick portion 46b described below. In the illustrated example, as shown in FIG. 1, the cover peripheral wall 4 is provided with a pair of locking ribs 18 for contacting an abutment rib c described below.

[0019] As shown in Fig. 5(B), an upward step 45 is provided around the upper end surface of the cylindrical peripheral wall 44 of the outer container 40. This upward step 45 is a portion for engaging the flange 6, as shown in Fig. 2(B). As shown in Fig. 5(A), the fitting cylindrical portion 46, which is the upper portion of the cylindrical peripheral wall 44, is formed as a thick-walled portion 46b at at least one location (two locations in the illustrated example) in the circumferential direction of the fitting cylindrical portion 46, and the remaining portion is formed as a thin-walled portion 46a. As shown in Fig. 6, the thin-walled portion 46a is a portion that is recessed in the radial direction when viewed from the inside. On both circumferential sides of the thick portion 46b, side surfaces f1 and f2 are formed which are step surfaces between the thick portion 46b and the thin portion 46a. As shown in FIG. 5(B), the engagement lateral groove 48 is provided in the thick-walled portion 46b so as to extend from one side surface f1 to the other side surface f2 in the circumferential direction of the thick-walled portion 46b. The reason for providing the thin portion 46a is to ensure a gap G, which is an introduction path for the engaging protrusion 8, between the inner surface of the thin portion 46a and the outer surface of the cover peripheral wall 4 (see FIG. 2(A)). 2A, a base end E1 of the horizontal engagement groove 48 is continuous with the gap G. A tip end E2 of the horizontal engagement groove 48 is formed as a closed end in the illustrated example. Fig. 7 is an explanatory diagram showing the inner structure of the fitting cylinder 46 in a panoramic development. When fitting the outer container 40 to the cover member 2, as shown in Fig. 7(A), the lower half of the inner container 100 is inserted into the outer container 40, and the cover member 2 and the outer container 40 are aligned in the circumferential direction so that the engaging protrusion 8 is above the thin-walled portion 46a. As shown in Fig. 7(B), the cover peripheral wall 4 and the cylinder peripheral wall 44 are fitted together so that the engaging protrusion 8 is inserted into the gap G. Next, as shown in Fig. 7(C), the cover member 2 is rotated in the forward direction D1 relative to the outer container 40, and the engaging protrusion 10 is fitted into the horizontal engaging groove 48 as shown in Fig. 7(D). Furthermore, when removing the outer container 40 from the cover member 2, as shown in Figure 7 (D), the cover member 2 is rotated in the opposite direction D2 relative to the outer container 40 to remove the engaging protrusion 10 from within the engaging horizontal groove 48, and then the outer container 40 is pulled out from the cover member 2. In this embodiment, as shown in Fig. 5(A), abutment ribs c that protrude slightly inward are provided vertically at appropriate positions on the inner surface of the thick portion 46b (in the illustrated example, positions adjacent to the base end E1 of the engagement lateral groove 48 and the other side surface f2 of the thick portion 46b). This will be described later. In the illustrated example, the upper side surface US of the lateral engagement groove 48 is a horizontal surface, whereas the lower side surface LS of the lateral engagement groove 48 is formed as a surface inclined downward and inward (see FIG. 6).

[0020] In this embodiment, when the cover member 2 is attached to the outer container 40, the flange portion 6 abuts against the upper end surface side of the fitting tube portion 46, and the engagement protrusion 10 abuts against the upper side surface US of the engagement horizontal groove 48. This structure prevents the outer container 40 from rattling in the up-down direction relative to the cover member 2.

[0021] The attachment / detachment mechanism A of this embodiment includes a stopper means S between the cover peripheral wall 4 and the fitting tubular portion 46. This stopper means S is composed of a locking projection 50 provided in the horizontal engagement groove 48 as shown in Fig. 5(A) and a receiving groove 14 provided in the engagement protrusion 10 as shown in Fig. 3(B). The locking projection 50 is provided on a portion of the horizontal engagement groove 48 in the longitudinal direction (in the illustrated example, the intermediate portion in the longitudinal direction). As shown in FIG. 5B, the locking projection 50 divides the engagement lateral groove 48 into a first lateral groove portion 48a on the base end E1 side of the locking projection 50 and a second lateral groove portion 48b on the tip end E2 side of the locking projection 50. The locking projection 50 projects radially from the groove bottom 49 of the lateral engagement groove 48 with a length shorter than the depth of the lateral engagement groove 48 . The receiving groove 14 is recessed in the vertical direction in a part of the longitudinal direction of the engaging projection 10 in correspondence with the location where the locking projection 50 is attached. The receiving groove 14 divides the engaging projection 10 into a base portion 12 and a tip portion 16 . By rotating the cover member 2 relative to the outer container 40, the tip 16 of the engaging protrusion 10 climbs over the locking projection 50 and is fitted into the second lateral groove portion 48b, and the base 12 of the engaging protrusion 10 is fitted into the first lateral groove portion 48a. When the cover member 2 is attached to the outer container 40, the locking projection 50 is clamped within the receiving groove 14, so that the stopper means S is configured to brake the rotation of the cylindrical peripheral wall 44 relative to the cover peripheral wall 4. With this configuration, rattling of the outer container 40 relative to the cover member 2 in the rotational direction can be reduced. Furthermore, in the configuration in which the tip 16 of the engaging protrusion 10 climbs over the locking projection 50, dimensional variations are less likely to affect the magnitude of the opening and closing torque compared to the above-mentioned Patent Document 1.

[0022] In this embodiment, a pair of locking ribs 18 for contacting abutment ribs, which will be described later, are provided on the outer surface of the cover peripheral wall 4. In the illustrated example, a pair of left and right locking ribs 18 shown in Fig. 1 are provided. The illustrated locking rib 18 is formed vertically long. The structure (shape, number, etc.) of these ribs can be changed as appropriate.

[0023] In this embodiment, a short, circumferentially wide abutment rib c is provided protruding inward from a suitable position on the inner surface of the thick portion 46b (in the illustrated example, a position adjacent to the other side surface f2 of the thick portion 46b). Then, by rotating the outer container relative to the cover member 2, with the locking projection 50 being clamped within the receiving groove 14, the locking rib 18 rides up onto the inner surface of the abutment rib c and comes into contact (preferably pressure contact). This enables the frictional force between the locking rib 18 and the abutting rib c to further reduce rattling of the outer container 40 relative to the cover member 2 in the rotational direction.

[0024] In the above configuration, when the outer container 40 is attached to the cover member 2 of the inner container 100, as described above, the part of the inner container below the cover member 2 is inserted into the outer container 40, the engaging protrusion 8 is aligned with the gap G, and then the inner container 100 and cover member 2 are lowered relative to the outer container 40 until the flange 6 abuts against the upward step 45. The user can recognize that the engaging protrusion 10 and the horizontal engaging groove 48 have been positioned vertically by the feeling of the flange 6 abutting. Next, when the outer container 40 is rotated in the forward direction D1 relative to the cover member 2, the engaging projection 10 is inserted into the horizontal engaging groove 48, and further, the tip 16 of the engaging projection 10 rides over the locking projection 50. The locking projection 50 is then clamped within the receiving groove 14, and the locking rib 18 provided on the outer surface of the cover peripheral wall 4 is brought into contact (preferably pressure-welded) with the abutment rib c of the thick portion 46b. This reduces rattling of the outer container 40 relative to the cover member 2 in the rotational direction. In addition, when the cover member 2 is attached to the outer container 40, the flange portion 6 abuts against the upper end surface of the fitting cylinder portion 46, and the engagement protrusion 10 abuts against the upper side surface US of the engagement horizontal groove 48, thereby preventing the outer container 40 from rattling in the vertical direction relative to the cover member 2.

[0025] Next, when the contents of the inner container 100 have been used up, the outer container 40 is rotated in the opposite direction D2 relative to the cover member 2, whereby the engaging protrusion 10 is pulled out from within the engaging horizontal groove 48, and by further pulling the outer container 40 relative to the cover member 2, the engaging tubular portion 46 comes off from the cover peripheral wall 4, and the outer container 40 can be removed. In this state, the inner container 100 is removed from the mounting tubular part 22, and the mounting tubular part 22 is attached to a new inner container 100 filled with the contents. Then, by reattaching the outer container 40 to the cover member 2 according to the above-mentioned procedure, the inner container replacement work is completed. Although this embodiment is applied to an attachment / detachment mechanism for a replacement container consisting of an outer container and a cover member, the present invention can also be embodied in an attachment / detachment mechanism for attaching and detaching various members to each other.

[0026] Next, effects of the embodiment of the present invention will be described. A feature common to all embodiments is that a circumferentially extending engagement groove 48 is provided on one of the inner surface of the mating cylindrical portion 46 and the outer surface of the cover peripheral wall 4, and an engagement protrusion 10 attached to the other is fitted into the engagement groove 48. A locking projection 50 is provided in the engagement groove 48 at part of its longitudinal direction, and by clamping this locking projection 50 within the receiving groove 14, the stopper means S consisting of the receiving groove 14 and the locking projection 50 brakes the rotation of the cylindrical peripheral wall 44 relative to the cover peripheral wall 4, thereby reducing rattling in the rotational direction of the outer container 40. Furthermore, in order to realize a state in which the locking protrusion 50 is clamped within the receiving groove 48, the tip 16 of the engaging protrusion 10, which is inserted into the engaging horizontal groove 48 by rotating the cover member 2, should overcome the locking protrusion 50, and, compared to the previously mentioned patent documents, dimensional variations are less likely to affect the magnitude of the opening and closing torque. A flange portion 6 is attached to the outer surface of the cover peripheral wall 4, and when the cover member 2 is attached to the outer container 40, the flange portion 6 abuts against the upper end surface of the mating cylindrical portion 46, and the engaging protrusion 10 abuts against the upper side surface US of the engaging horizontal groove 48, so that rattling of the outer container 40 in the vertical direction can be reduced. In an embodiment in which the engagement horizontal groove is provided in a thick-walled portion 46b formed in a portion of the circumferential direction of the fitting cylindrical portion 46 so as to extend from one side surface f1 of the thick-walled portion 46b to the other side surface f2 in the circumferential direction of the thick-walled portion 46b, and a locking rib 18 is attached to the outer surface of the cover peripheral wall 4 so as to contact an appropriate position on the inner surface of the thick-walled portion 46b, circumferential rattling of the outer container 40 can be further reduced. In an embodiment in which an annular flange portion 6 is attached to the outer surface of the cover peripheral wall 4, and the engaging protrusion 10 is positioned at the same height as the engaging horizontal groove 48 when the upper end surface of the cylindrical peripheral wall 44 is abutted against the flange portion 6 when the cover peripheral wall 44 is fitted to the cylindrical peripheral wall 44, the positioning of the engaging protrusion 10 can be easily performed. [Explanation of symbols]

[0027] 2: Cover member 4: Cover peripheral wall 4a: Upper half 4b: Lower half 6... flange portion 8... engaging protrusion 9... vertical rib 10: engagement protrusion; 12: base; 14: receiving groove; 16: tip; 18: locking rib 20: Inward flange 22: Mounting tube portion 24: Guide tube portion 40: outer container; 42: bottom wall portion; 44: cylindrical peripheral wall; 45: upward step portion 46...Upper part (fitting cylinder part) 46a...Thin wall part 46b...Thick wall part 48... engagement lateral groove 48a... first lateral groove portion 48b... second lateral groove portion (front lateral groove portion) 49: Groove bottom 50: Locking projection 52: Alignment recess 100: inner container; 102: mouth and neck portion; 110: discharger; 112: nozzle head 114…Nozzle 120…Overcap A... Attachment / detachment mechanism S... Stopper means c... Contact rib D1... Forward direction D2... Reverse direction E1: Base end E2: Tip f1: One side f2: Other side G...Gap LS...Lower side US...Upper side S...Stopper means

Claims

1. A mechanism for attaching and detaching an outer container (40) to a cover member (2) attached to an inner container, The cover peripheral wall (4) provided on the cover member (2) is fitted to the inner surface of a fitting cylindrical portion (46) which is the upper portion of the cylindrical peripheral wall (44) of the outer container (40), A circumferentially extending engagement groove (48) is provided on the inner surface of the fitting cylinder portion (46), and an engagement protrusion (10) provided on the outer surface of the cover peripheral wall (4) is fitted into the engagement groove (48), The engaging protrusion (10) is formed on a transverse rib, and a receiving groove (14) is provided in a portion of the transverse rib in the longitudinal direction thereof to separate a base portion (12) and a tip portion (16) of the transverse rib. A locking projection (50) is provided within a portion of the longitudinal direction of the engagement lateral groove (48), By rotating the cover member (2) relative to the outer container (40), the tip (16) of the engaging protrusion (10) inserted into the engaging lateral groove (48) passes over the locking projection (50) and is fitted into the lateral groove portion (48b) further forward than the locking projection (50), and the locking projection (50) is clamped within the receiving groove (14). In this clamped state, a stopper means (S) formed by the receiving groove (14) and the locking projection (50) brakes the rotation of the cylinder peripheral wall (44) relative to the cover peripheral wall (4). A thick-walled portion (46b) is formed in a part of the circumferential direction of the fitting cylindrical portion (46), and thin-walled portions (46a) recessed in the radial direction are formed on both sides of the thick-walled portion (46b), The engagement lateral groove (48) is provided in the thick-walled portion (46b) so as to extend from one side surface (f1) to the other side surface (f2) in the circumferential direction of the thick-walled portion (46b), A mechanism for attaching and detaching the cover member of the inner container to the outer container, characterized in that an engaging rib (18) is attached to the outer surface of the cover peripheral wall (4) so ​​as to come into contact with an appropriate position on the inner surface of the thick portion (46b).

2. 2. The mechanism for attaching and detaching the cover member of the inner container to the outer container as described in claim 1, characterized in that a flange portion (6) is attached to the outer surface of the cover peripheral wall (4), and the flange portion (6) is arranged so as to abut against the upper end surface side of the fitting cylindrical portion (46) and the engaging protrusion (10) is arranged so as to abut against the upper side surface (US) of the engaging horizontal groove (48) when the cover member (2) is attached to the outer container (40).

3. An annular flange portion (6) is attached to the outer surface of the cover peripheral wall (4), 3. The mechanism for attaching and detaching the cover member of the inner container to the outer container as described in claim 1 or 2, characterized in that, when the cylindrical peripheral wall (44) is fitted to the cover peripheral wall (4), the engaging protrusion (10) is positioned at the same height as the engaging horizontal groove (48) when the upper end surface of the cylindrical peripheral wall (44) is abutted against the flange portion (6).

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