JP7205822B2 - lid and container - Google Patents

Description

The present disclosure relates to a lid and a container comprising the lid and a container body.

As this type of lid, there is known a lid that can be removed from the container body by cutting an unsealing band part of the lid (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 9-110058 (Fig. 1)

The lid bodies described above have a problem that the lid bodies cannot be stably stacked. In response to this, development of a lid body that can be stably stacked and a container composed of the lid body and a container body is required.

A first aspect of the invention, which has been made to achieve the above object, is a lid that can be removed from a container main body by cutting an opening band portion of a part of the lid, wherein the opening band portion is cut before the opening band is cut. When the lids are stacked together, the upper and lower lids are fitted to each other regardless of whether the lids are in the pre-cut state or the cut-out state after the cut-off band portion is cut. The height of the stacked lid body group is smaller in the case of stacking the lid bodies in the post-cut state than in the case of stacking them together .

According to the invention of claim 2, when the lid bodies in the pre-cutting state are stacked, the lower end of the opening band part of the upper lid body is fitted to the lower lid body, and the opening band part 2. The lid according to claim 1, further comprising a fitting portion for post-cutting that is positioned above the lower end portion and fitted to the lid on the lower side when the lids in the post-cutting state are stacked together . is.

According to a third aspect of the invention, there is provided a lid that can be removed from a container body by cutting an opening band portion of a part of the lid, wherein the opening band portion is in a pre-cut state before cutting or when the opening band portion is removed. When the lids are stacked together, the upper and lower lids are fitted to each other, regardless of whether the lids are in a post-cut state after being cut, and an outer fitting wall that sandwiches the upper end of the container body in the inner and outer directions. a fitting wall that fits with the container body; and a fitting wall that is provided on the upper surface of the lid body and stacks the lid bodies together regardless of whether the lid body is in the state before or after the cutting. Sometimes, a stepped fitting portion that fits with the fitting wall is provided. A lid body in which the opening band portion abuts on the upper surface of the lid body when the lid bodies are stacked, and the inner fitting wall abuts on the upper surface of the lid body when the lid bodies in the cut-out state are stacked. be.

According to a fourth aspect of the invention, the stepped fitting portion protrudes upward, and when the lid body in the pre-cutting state is superimposed thereon, it is fitted to the opening band portion from the inside, and the lid body in the post-cutting state is fitted to the opening band portion from the inside. 4. The lid body according to claim 3, which is fitted to the inner fitting wall from the outside when the two are stacked.

The invention of claim 5 is a container comprising the lid and the container body according to claim 3 or 4, wherein the inner fitting wall is formed in a closed ring shape, and when the lid is fitted to the container body, the inner fitting wall is closed. , the container in which the outer surface of the inner fitting wall and the inner surface of the container body abut against each other.

The invention according to claim 6 is a container comprising the lid body according to claim 3 or 4 and a container body, wherein the upper surface of the lid body has a lower end portion of the container body inside the fitting wall. The container is provided with a fitting recess for fitting, and a gap between the inner fitting wall and the stepped wall between the opening edge of the fitting recess and the bottom.

The invention according to claim 7 is a container comprising the lid body according to claim 3 or 4 and a container body, wherein the upper end of the container body is provided with a protrusion projecting sideways, and the lid body The outer fitting wall is formed with a receiving recess for receiving the projection regardless of whether it is in the pre-cutting state or the post-cutting state. is a container in which a push-in portion for pushing the upper end portion of the container main body toward the outer peripheral wall main body protrudes.

According to the lid body of claim 1, regardless of whether the opening band part is in a pre-cutting state before cutting or a cut-out state after cutting, when the lid bodies are stacked, the upper and lower lid bodies are fitted to each other, the stacking of the lids can be stabilized.

According to the lid of claim 3 , regardless of whether the opening band is in a pre-cutting state before cutting or a cut-out state after cutting, when the lids are stacked, the upper and lower lids are separated from each other. are fitted to each other, the stacking of the lids can be stabilized. In addition, since the height when the cover bodies in the state after cutting are stacked is smaller than the height when the cover bodies in the state before cutting are stacked, the volume when the cover bodies are stacked can be reduced. can.

In the lid according to claim 4, the stepped fitting portion protrudes upward from the upper surface of the lid, and when the lid before cutting is placed on top of it, it is fitted to the unsealing band portion from the inside and after cutting. When the lids are stacked on top of each other, they are fitted to the inner fitting wall from the outside.

According to the lid body of claim 5, when the lid body is fitted to the container body, the outer surface of the closed ring-shaped inner fitting wall and the inner surface of the container body come into contact with each other, so that the sealing performance of the container can be improved.

According to the lid of claim 6, when the containers are stacked, the lower end of the upper container is fitted to the upper surface of the lid, so that the stacking of the containers can be stabilized. In addition, since there is a gap between the stepped wall of the fitting recess and the inner fitting wall, even if a load is applied to the stepped wall of the fitting recess due to, for example, the upper container being pushed from the side, the gap will remain open. It functions as a cushion and prevents the lid and the container body from being disengaged from each other.

According to the cover of claim 7, regardless of whether the cover is in the state before or after cutting, when the cover is fitted to the container body, the projection of the container body is received in the receiving concave portion of the cover, and the lid is closed. Since it is locked to the container body, the lid body can be locked to the container body even after the opening band is cut off and the lid is opened.

1 is a perspective view of a container according to the present disclosure; FIG. Cross section of container Enlarged cross-sectional view of a part of the container Side cross-sectional view of the lid before excision Partially enlarged cross-sectional view of stacked containers Side cross-sectional view of the lid after excision Partially enlarged cross-sectional view of a state in which lids before excision are stacked Partially enlarged cross-sectional view of a state in which lids after excision are stacked Perspective view of a state in which cover bodies in a state before excision are stacked together Perspective view of a state in which cover bodies in a state after excision are stacked Sectional view of a state in which the cover body before excision and the cover body after excision are separately stacked. (A) Partially enlarged cross-sectional view of a state in which lids are stacked before cutting according to a modification, (B) Partially enlarged cross-sectional view of a state in which lids are stacked after cutting according to a modification (A) Partially enlarged cross-sectional view of a state in which lids are stacked before cutting according to a modification, (B) Partially enlarged cross-sectional view of a state in which lids are stacked after cutting according to a modification (A) Partially enlarged cross-sectional view of a state in which lids are stacked before cutting according to a modification, (B) Partially enlarged cross-sectional view of a state in which lids are stacked after cutting according to a modification Plan view of lid according to modification Partially enlarged cross-sectional view of a state in which the containers according to the modification are stacked Partially enlarged cross-sectional view of a state in which the containers according to the modification are stacked

FIG. 1 shows a container 10 comprising a container body 11 and a lid 20 that seals an upper opening 11K (see FIG. 2) of the container body 11. As shown in FIG. Both the container main body 11 and the lid 20 are resin injection products, for example.

The container body 11 has a so-called bucket shape, and has a disk-shaped bottom wall 12 (see FIG. 2) and a cylindrical side wall 13 that slightly narrows downward. As shown in FIG. 2 , the bottom wall 12 is arranged slightly above the lower end of the side wall 13 , and the lower end of the side wall 13 forms a protruding portion 13</b>A that protrudes downward from the bottom wall 12 . The central portion of the bottom wall 12 is a raised portion 12A that protrudes upward, and an annular ridge 12B protrudes downward from its lower surface. In addition, the lower end of the protrusion 12B is positioned at substantially the same height as the upper surface of the main body portion 12C of the bottom wall 12 .

As shown in FIG. 2, a triangular ridge 14 is provided near the upper end of the container body 11, protruding sideways from the outer surface of the side wall 13 and extending over the entire circumference. As shown in FIG. 3 , the triangular ridge 14 has a horizontally extending lower surface 14A and an inclined surface 14B extending obliquely upward from the tip of the lower surface 14A to the side wall 13 . Further, as shown in FIG. 2, a first flange 16 and a second flange 17 are vertically arranged on the outer surface of the side wall 13 below the triangular ridge 14 . The distance between the triangular ridge 14 and the first flange 16 is slightly longer than the distance between the triangular ridge 14 and the upper end of the side wall 13 . The second flange 17 is arranged at a position separated from the upper end of the container body 11 by about ⅓ of the height of the container body 11 .

As shown in FIG. 3, the upper end of the container body 11 is formed with a protrusion 15 that slightly protrudes outward from the upper edge. The projecting portion 15 is provided over the entire circumference of the upper end of the container body 11 , and the upper surface thereof is flush with the upper end surface of the container body 11 . Moreover, the protrusion 15 has a length that is about 1/4 to 1/5 of the thickness of the side wall 13 in both the vertical and horizontal directions.

As shown in FIG. 1, the lid 20 has a circular planar shape like the container body 11, and has a fitting wall 21 for fitting with the container body 11 on the outer edge thereof. As shown in FIG. 4, the fitting wall 21 has a double wall structure consisting of an outer fitting wall 22 and an inner fitting wall 23. The upper end of the side wall 13 of the container body 11 is fitted, and the lid body 20 is fitted to the container body 11 (see FIG. 2). Further, as shown in FIG. 4 , the lower end of the inner fitting wall 23 is located above the lower end of the outer fitting wall 22 .

As shown in FIG. 3 , a receiving recess 22A for receiving the projecting portion 15 of the container body 11 is formed at the upper end portion of the inner surface of the outer fitting wall 22 of the fitting walls 21 . On the other hand, on the outer surface of the inner fitting wall 23, a pushing portion 23A for pushing the upper end of the container body 11 toward the outer fitting wall 22 protrudes from a portion facing the receiving recess 22A. As a result, the protrusion 15 of the container body 11 is engaged with the receiving recess 22A of the lid 20 in a concave-convex manner.

As shown in FIG. 4, the lid body 20H excluding the fitting wall 21 of the lid body 20 has a horizontal outer plate portion 24 on the outer side from a position slightly inside the fitting wall 21, and the outer plate portion 24 on the inner side. An inner plate portion 25 recessed from the portion 24 is formed. A stepped wall 26 between the outer plate portion 24 and the inner plate portion 25 is arranged with a gap from the inner fitting wall 23 . The stepped wall 26 is slightly inclined so as to widen upward, and the gradient of the upper portion is gentler than that of the lower portion. A fitting recess 20K is formed in the lid body 20H by the stepped wall 26 and the inner plate portion 25, and as shown in FIG. It fits into the fitting recess 20K of the container 10 on the lower side. At this time, even if a load is applied to the stepped wall 26, for example, when the upper container 10 is pushed from the side, the gap between the stepped wall 26 and the inner fitting wall 23 functions as a cushion, and the lid body Disengagement of the fitting between 20 and container body 11 is suppressed. The inner plate portion 25 has a central portion higher than the outer edge portion by one plate thickness, and the stepped surface is inclined.

As shown in FIG. 3, a V-groove 27 capable of receiving the triangular ridge 14 of the container body 11 is formed above the lower end of the inner fitting wall 23 in the middle of the inner surface of the outer fitting wall 22 in the vertical direction. A thin portion 28 is formed at the bottom of the V-groove 27 . An upper side surface 27A of the inner surface of the V-groove 27 extends parallel to the inclined surface 14B of the triangular ridge 14 of the container body 11, and a lower side surface 27B extends slightly inclined from the lower end of the upper side surface 27A. As shown in FIG. 1, a part of the V-groove 27 (see FIG. 3) is a notch 27K penetrating in the inner and outer directions. A thin portion 29 is provided. A knob piece 30 protrudes from the lower end of the portion of the outer fitting wall 22 below the notch 27K. The grip piece 30 protrudes outward from the outer fitting wall 22, hangs downward, and is bent outward vertically.

By holding the gripping piece 30 and pulling it downward, the vertically dividing thin portion 29 is broken, and by pulling it sideways, the thin portion 28 is broken, and the outer fitting wall 22 is below the thin portion 28 . The opening band portion 22X on the side is torn and cut away from the outer fitting wall main body 22Y on the upper side (see FIG. 6). A grasping piece 31 projecting sideways is provided at the upper end of the lid body 20 on the opposite side of the gripping piece 30 across the vertically split thin wall portion 29 . By applying the above, the tearing work is facilitated. Further, as shown in FIG. 3, the plate thickness of the opening band portion 22X is smaller than the plate thickness of the outer fitting wall main body 22Y, and there is a slight gap between the opening band portion 22X and the side wall 13 of the container main body 11. There is a gap. Hereinafter, the state of the lid body 20 before the tear band portion 22X is cut is referred to as a pre-cutting state, and the state of the lid body 20 after the tear band portion 22X is cut is referred to as a post-cutting state.

As shown in FIG. 2, when the lid 20 is fitted to the container body 11, the triangular ridges 14 of the container body 11 are engaged with the V-shaped grooves 27 of the lid 20, and the lid 20 is fitted to the container body 11. It is fixed (so-called fitting). At this time, the lower end surface of the unsealing band portion 22X and the first flange 16 are opposed to each other with only a slight gap left. is prevented from coming off. Then, when the opening band portion 22X is torn as described above, the lid body 20 can be removed from the container body 11 .

As shown in FIG. 2, the lid body 20 of the present embodiment includes a closed ring-shaped annular projection 35 (a "stack fitting portion" in the claims) on the upper surface of the outer plate portion 24 of the lid body 20H. ) is provided. The annular ridge 35 is arranged between the outer fitting wall 22 and the inner fitting wall 23 . As shown in FIG. 7, when the cover body 20 in the pre-cut state is superimposed, the unsealing band portion 22X of the outer fitting wall 22 abuts on the upper surface of the outer plate portion 24, and this unsealing band portion An annular ridge 35 is adjacent to 22X from the inner side and engages in concave-convex engagement. On the other hand, as shown in FIG. 8, when the lid body 20 in the post-cut state is overlaid, the inner fitting wall 23 abuts against the upper surface of the outer plate portion 24, and the inner fitting wall 23 is formed with an annular ridge. 35 are concavo-convex engaged from the outside.

The description about the structure of the container 10 of this embodiment is above. Next, the effects of this container 10 will be described. This container 10 is used for storing, transporting, and selling liquids such as dyes and foods, for example. For this purpose, the lid 20 is pushed in such that the upper end portion of the container body 11 containing the contents is sandwiched between the outer fitting wall 22 and the inner fitting wall 23 of the lid 20 . Then, the outer fitting wall 22 is pushed by the triangular ridge 14 of the container body 11 and moves downward while deforming outward. After returning, the V-groove 27 of the lid 20 is engaged with the triangular ridge 14, and the lid 20 is fitted and fixed to the container body 11 (so-called fitting) (see FIG. 2).

When opening the container 10, the grip piece 30 is pulled and the opening band part 22X is torn off to release the lock between the V-groove 27 and the triangular ridge 14, and the lid 20 can be removed.

Here, in the container 10 of the present embodiment, the opening band portion 22X is thinner than the upper outer fitting wall main body 22Y and has a larger inner diameter. The amount of deformation of the wall 22 can be reduced, and the mounting work can be facilitated.

Further, when the lid 20 is fitted to the container body 11, the upper end of the container body 11 is pressed against the outer fitting wall 22 of the lid 20 by the push-in portion 23A (see FIG. 3) of the lid 20, and the container 10 is closed. The sealing performance is improved, and the projection 15 of the container body 11 engages with the receiving recess 22A of the lid 20, so that the locking between the lid 20 and the container body 11 becomes stronger. Further, the side wall 13 of the container body 11 is tilted with respect to the inner fitting wall 23 by the pushing portion 23A, so that the lower end of the inner fitting wall 23 comes into close contact with the side wall 13 of the container body 11, Sealability of the container 10 is further enhanced. Moreover, since the push-in portion 23A, the protrusion 15, and the receiving recess 22A are arranged at the upper end portion of the container body 11 and the fitting wall 21, after the unsealing band portion 22X is cut off, that is, after the container 10 is unsealed. However, the lid 20 is weakly engaged with the container body 11, preventing the lid 20 from coming off due to vibration or the like, and keeping the container 10 tightly sealed. In addition, since the protrusion 15 is considerably smaller than the thickness of the side wall 13, it can be easily removed while having a locking function.

By the way, in this type of conventional container, the lids are not designed to fit together, so that the lids cannot be stacked together, or even if they are stacked, the lids are unstable. With this container, the lid may come apart during storage before being attached, or when attaching the lid to the container body, it is necessary to remove the lid from the scattered pieces. , was time consuming.

On the other hand, according to the container 10 of the present embodiment, when the cover bodies 20 in the pre-cut state are stacked (see FIG. 9), the lower cover body 20 is attached to the opening band portion 22X of the upper cover body 20. Since the annular ridges 35 are adjacently engaged from the inner side (see FIG. 7), lateral displacement of the upper lid 20 is prevented. As a result, the lid bodies 20 can be stably stacked, so that the lid bodies 20 in the pre-cut state can be stored without being bulky. In addition, in the operation of attaching the lids 20 to the container body 11, the lids 20 can be picked up one by one smoothly, and the working efficiency is enhanced. In addition, since the tab piece 30 protrudes downward in the cover body 20 before being cut, it is desirable to turn it over (with the fitting wall 21 facing upward) and stack it. In addition, in this embodiment, since the gripping piece 30 and the gripping piece 31 are displaced in the horizontal direction, the lid bodies 20 can be stacked in the same direction.

Further, even after the container 10 is opened by cutting the unsealing band portion 22X, the lids 20 in the state after cutting are stored together for reuse of the container 10 as a tapper, for example, or for disposal. However, even in this case, if the lids 20 in the post-cut state are stacked together (see FIG. 10), the inner fitting wall 23 of the upper lid 20 will be attached to the lower lid 20. Since the annular ridges 35 are adjacent to each other from the outside and are engaged with each other in a concave-convex manner (see FIG. 8), the lid bodies 20 in the cut-off state can be stably stacked and stored easily. Moreover, in the lid body 20 before cutting, the unsealing band portion 22X of the outer fitting wall 22 abuts the upper surface of the outer plate part 24, whereas in the lid body 20 after cutting, the inner fitting wall 23 is in contact. Since it abuts on the upper surface of the outer plate portion 24, it is possible to reduce the volume when the lid bodies 20 are stacked after the opening band portion 22X is cut off. In addition, since the tab piece 30 is cut off together with the opening band portion 22X in the lid body 20 in the cut-off state, the lid body 20 can be stacked regardless of which side faces up.

When opening the container 10, some people may remove the lid 20 by forcibly spreading the lower end of the opening band 22X outward without cutting the opening band 22X. On the other hand, according to the present embodiment, as shown in FIG. 11, even if the lid bodies 20 in the pre-cutting state and the ones in the post-cutting state are mixed, they can be stacked on each other. can be further improved.

[Other embodiments]
(1) In the above embodiment, the planar shape of the container 10 is circular, but it may be elliptical or polygonal.

(2) In the above embodiment, the tab piece 30 protrudes downward, but it may protrude sideways. In this case, when stacking the lid bodies 20 in the pre-cut state, they can be stacked regardless of which side faces up.

(3) As shown in FIG. 12, the lower end of the inner fitting wall 23 is located above the V-groove 27 of the outer fitting wall 22, and both before and after cutting, the outer A configuration in which the fitting wall 22 fits with the lower lid body 20 may be employed. Moreover, the structure which does not have the inner fitting wall 23 may be sufficient.

(4) In the above embodiment, the opening band portion 22X of the outer fitting wall 22 and the inner fitting wall 23 are both fitted with the annular ridge 35. However, as shown in FIG. 22, and an annular protrusion 35Y that fits with the inner fitting wall 23 may be separately provided.

(5) As shown in FIG. 14, the lower end of the inner fitting wall 23 is positioned below the lower end of the unsealing band portion 22X of the outer fitting wall 22, and both before and after cutting. , the inner fitting wall 23 may be fitted with the lid 20 on the lower side.

(6) In the above-described embodiment, the fitting recess 20K is formed so that the lower end of the upper container 10 is fitted when the lids 20 are stacked. The upper surface of body 20 may be flat.

(7) In the above embodiment, when the lid bodies 20 are stacked, the fitting wall 21 fitted to the container body 11 is fitted to the lid body 20 on the lower side. Locations other than the above may be fitted. For example, the lower surface of the lid body 20 may be provided with a projection that fits with the lower lid body 20 separately from the fitting wall 21 .

(8) In the above embodiment, the upper surface of the lid body 20 is provided with the annular ridge 35 that fits with the lid bodies 20 stacked thereon. However, a fitting groove may be provided.

(9) In the above-described embodiment, the closed ring-shaped ridge is fitted to the fitting wall 21 of the lid 20 stacked above, but it may be an open ring-shaped ridge. Protrusions formed at a plurality of locations may also be used. Similarly, the inner fitting wall 23 may also be an open ring, or may be protrusions formed at a plurality of locations.

(10) In the above embodiment, the upper portion and the lower portion of the stepped wall 26 have different slopes, but the slopes may not change. Alternatively, the step wall 26 may extend vertically.

(11) As shown in FIGS. 15 to 17, a plurality of (for example, six) ribs 20L protrude inward from the stepped wall 26 so that when the containers 10 are stacked together, the fitting recesses 20K are fitted. The lower end of the received upper container 10 may be in contact with or close to the rib 20L. In the example shown in FIGS. 15 and 16, the ribs 20L are straight and close to the side wall 13 of the upper container 10 to restrict the lateral displacement of the upper container 10. In the example shown in FIGS. 16 is a cross-sectional view of the stacked containers 10 taken along line AA in FIG. 15. As shown in FIG. In the example shown in FIG. 17, the ribs 20L are L-shaped to prevent the upper container 10 from slipping laterally and to support the upper container 10 from below. Alternatively, the rib 20L may protrude only from the lower portion of the stepped wall 26, the rib 20L may support the upper container 10 from below, and the stepped wall 26 may be adjacent to the side wall 13 of the upper container 10. .

REFERENCE SIGNS LIST 10 container 11 container body 13 side wall 14 triangular ridge 15 protrusion 20 lid 20H lid body 20K fitting recess 21 fitting wall 22 outer fitting wall 22A receiving recess 22X opening band 22Y outer fitting wall main body 23 inner fitting Wall 23A Push-in portion 27 Groove 35 Annular ridge (step fitting portion)

Claims (7)

In the lid that can be removed from the container body by cutting off a part of the opening band part of the lid,
Regardless of whether the lids are in a pre-cutting state before the tearing band portion is cut or a cut-out state after the tearing band portion is cut, when the lids are stacked, the top and bottom lids are separated from each other. mated ,
The height of the stacked lid body group is smaller in the case of stacking the lid bodies in the post-cut state than in the case of stacking the lid bodies in the pre-cut state . When the lid bodies in the pre-cut state are stacked together, the lower end of the opening band portion of the upper lid body is fitted to the lower lid body,
2. A fitting part for post-cutting is provided above the lower end of the unsealing band part and fitted to the lower lid when stacking the lids in the post-cutting state. The lid described in . In the lid that can be removed from the container body by cutting off a part of the opening band part of the lid,
Regardless of whether the lids are in a pre-cutting state before the tearing band portion is cut or a cut-out state after the tearing band portion is cut, when the lids are stacked, the top and bottom lids are separated from each other. mated,
a fitting wall that has an outer fitting wall and an inner fitting wall sandwiching the upper end of the container body in the inner and outer directions, and that fits with the container body;
a stacking fitting portion provided on the upper surface of the lid body and fitted with the fitting wall when the lid bodies are stacked together regardless of whether the lid bodies are in the pre-cutting state or the cut-out state;
A lower portion obtained by dividing the outer fitting wall into two upper and lower portions forms the unsealing band portion,
When the lid body in the pre-cut state is laid thereon, the unsealing band portion abuts on the top surface of the lid body, and when the lid body in the cut-out state is laid thereon, the inner fitting wall contacts the top surface of the lid body. Abutting lid . The stepped fitting portion protrudes upward, fits into the unsealing band portion from the inside when the lid in the pre-cut state is placed thereon, and fits inside the opening band portion when the lid in the post-cut state is placed thereon. 4. The lid according to claim 3, which is fitted to the joint wall from the outside. A container comprising the lid according to claim 3 or 4 and a container body,
A container in which the inner fitting wall is formed in a closed ring shape, and when the lid is fitted to the container body, the outer surface of the inner fitting wall and the inner surface of the container body abut against each other. A container comprising the lid according to claim 3 or 4 and a container body,
A fitting recess for fitting the lower end of the container body is formed on the upper surface of the lid inside the fitting wall,
A container having a gap between a stepped wall between the opening edge of the fitting recess and the bottom and the inner fitting wall. A container comprising the lid according to claim 3 or 4 and a container body,
While the upper end of the container body is provided with a projection projecting sideways, the outer fitting wall of the lid body receives the projection regardless of whether it is in the state before or after cutting. a receiving recess is formed;
A container in which a push-in portion for pushing an upper end portion of the container body toward the outer peripheral wall main body protrudes from a portion of the outer surface of the inner fitting wall that faces the receiving recess.

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