JP2018154341A - Synthetic fiber container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new type of synthetic fiber container lid which enables prevention of excessive engagement of a male screw (22) of a lid and a female screw (58) of an external cover (6) in a sure manner by restricting a covered wall (16) of a lid (4) from inclining radially inwardly upwardly.SOLUTION: A shoulder part (62), defined by the lower face of a projection (60) which is formed above a female screw (58) on the inner periphery of a covering wall (50) or on the inner surface of a top panel (46), and/or the free end surface of a covered wall (16) of a lid (4) are inclined upwardly and radially outwardly.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a synthetic resin container lid composed of a lid body attached to the mouth and neck of a container and an outer lid attached to the lid body.

  As a container lid for a glass or synthetic resin container containing a liquid such as a liquid seasoning, the following Patent Document 1 discloses a lid body attached to the mouth and neck portion of the container and an external part attached to the lid body. A synthetic resin container lid composed of a lid is disclosed. The lid body includes a cylindrical mounting wall whose upper end is a free end surface, and a male thread is formed on the outer peripheral surface of the mounting wall. The outer lid includes a top wall and a cylindrical mounting wall depending from the top wall, and female threads are formed on the inner peripheral surface of the mounting wall. A cylindrical projection that extends continuously in the circumferential direction is formed on the inner surface of the top wall of the outer lid, and a shoulder surface that extends continuously in the circumferential direction is defined by the lower surface of the projection. The outer lid is mounted on the lid body by screwing the female thread formed on the mounting wall of the outer lid to the male thread formed on the mounted wall of the lid body. The degree of screwing between the male thread of the lid main body and the female thread of the outer lid is regulated by the shoulder surface of the outer lid coming into contact with the free end surface of the mounted wall of the lid main body.

Japanese Patent No. 4005208

  Thus, according to the experience of the present inventors, the conventional container lid as described above has the shoulder surface of the outer lid in contact with the free end surface of the mounted wall of the lid body, and the pressing force of the mounted wall. Is applied, the wall to be mounted is inclined radially inward upward, and the female thread of the outer lid is excessively screwed into the male thread of the lid main body, and as a result, it gets over the screw. It has been found that there is a risk of so-called overturn that causes rotation.

  The present invention has been made in view of the above-mentioned fact, and the main technical problem thereof is that the mounting wall of the lid body is sufficiently prevented from being inclined radially inwardly upward, and therefore the lid body. It is an object of the present invention to provide a new and improved synthetic resin container lid that reliably prevents the female thread of the outer lid from being excessively screwed onto the male thread.

  As a result of diligent research, the present inventors have found that the shoulder surface of the outer lid (the shoulder surface is formed with a female thread on the inner peripheral surface of the mounting wall of the outer lid instead of the protrusion formed on the inner surface of the top wall. And can also be defined by the lower surfaces of the protrusions formed circumferentially apart from the circumferentially spaced protrusions) and It has been found that the main technical problem can be achieved by inclining the free end surface of the mounted wall upward in the radial direction.

That is, according to the present invention, as a synthetic resin container lid that achieves the main technical problem described above, it is composed of a lid body attached to the mouth and neck of the container and an outer lid attached to the lid body,
The lid body includes a cylindrical mounting wall whose upper end is a free end surface, and a male thread is formed on the outer peripheral surface of the mounting wall.
The outer lid includes a top wall and a cylindrical mounting wall depending from the top wall. A female thread is formed on an inner peripheral surface of the mounting wall, and the female on the inner peripheral surface of the mounting wall is formed. A plurality of protrusions arranged at intervals in the circumferential direction or protrusions extending continuously in the circumferential direction are formed above the portion where the thread is formed or on the inner surface of the top wall. , A shoulder surface is defined which extends continuously in the circumferential direction at intervals in the circumferential direction defined by the lower surface of the protrusion,
The female thread formed on the mounting wall of the outer lid is screwed into the male thread formed on the mounted wall of the lid body, and the shoulder surface of the outer lid is mounted on the mounted surface In a synthetic resin container lid in which the outer lid is attached to the lid body by contacting the free end surface of the wall,
The shoulder surface of the outer lid and / or the free end surface of the mounted wall of the lid body are inclined upwards radially outward;
A synthetic resin container lid is provided.

  Preferably, the shoulder surface of the outer lid and / or the free end surface of the mounted wall is inclined at an inclination angle of 5 to 30 degrees with respect to the horizontal. On the inner peripheral surface of the mounting wall of the outer lid, a plurality of protrusions that are located above the female thread and below the shoulder surface and are spaced apart in the circumferential direction Alternatively, a protrusion extending continuously in the circumferential direction is formed, and the inner diameter of the protrusion is larger than the inner diameter of the protrusion, and when the outer lid is attached to the lid body, the inner surface of the protrusion is The form which opposes the outer peripheral surface of the site | part in which this external thread does not exist in the upper end part of the outer peripheral surface of this to-be-attached wall of a lid body at intervals is preferable. A plurality of protrusions or circumferentially arranged at intervals in the circumferential direction on the outer circumferential surface of the upper end portion of the outer circumferential surface of the mounted wall of the lid body where the male thread does not exist. And the outer diameter of the protrusion is larger than the inner diameter of the protrusion. When the outer lid is attached to the lid body, the outer surface of the protrusion is the attachment of the outer lid. It is also preferable that the wall is opposed to the portion of the inner peripheral surface of the wall below the shoulder surface and above the female thread at a distance.

  According to the synthetic resin container lid of the present invention, when the shoulder surface of the outer lid comes into contact with the free end surface of the mounting wall of the lid body and a pressing force is applied to the mounting wall, the shoulder surface of the outer lid and / or Since the free end face of the mounting wall of the lid body is inclined upward in the radial direction, a force is applied to the mounting wall not inward in the radial direction but outward in the radial direction. Although it is not always easy to restrict the tilt inward in the radial direction toward the upper side of the mounted wall due to various structural restrictions on the container lid, the outer side in the radial direction toward the upper side of the mounted wall. The inclination to the side can be regulated sufficiently easily by arranging a protrusion on the inner peripheral surface of the mounting wall of the outer lid or the outer peripheral surface of the mounting wall of the lid main body. Thus, according to the synthetic resin container lid of the present invention, it is sufficiently reliably prevented that the female thread of the outer lid is excessively engaged with the male thread of the lid body.

The front view which shows a part in cross section in the state with which suitable embodiment of the synthetic resin container lid comprised according to this invention was mounted | worn to the mouth neck part of the container. Sectional drawing of the outer cover in the synthetic resin container lids shown in FIG. The bottom view of the outer lid in the synthetic resin container lid shown in FIG.

  Hereinafter, a preferred embodiment of a container lid constructed according to the present invention will be described in more detail with reference to the accompanying drawings.

  A container lid, generally designated by numeral 2, constructed in accordance with the present invention comprises a lid body 4 and an outer lid 6. The lid body 4 can be injection molded from a relatively soft synthetic resin such as polyethylene, and the outer lid 6 can be injection molded from a relatively hard synthetic resin such as high density polyethylene or polypropylene.

  Referring to FIG. 1, the lid body 4 includes a closing wall 8 and a cylindrical side wall 10 depending from the outer peripheral edge of the closing wall 8. The blocking wall 8 is divided into a circular central region 8a positioned relatively upward when viewed in the axial direction and an annular outer peripheral region 8b positioned relatively downward when viewed in the axial direction. A circular discharge opening forming region 14 defined by an annular breakable line 12 is provided in the central region 8 a of the blocking wall 8. On the upper surface of the blocking wall 8, a cylindrical mounting wall 16 extending upward at a substantially intermediate position in the radial direction of the outer peripheral region 8 b and having a free end surface at the upper end, and upward at the radially inner edge of the outer peripheral region 8 b A cylindrical pouring wall 18 that extends and a cylindrical locked wall 20 that extends upward at the center of the central region 8a (more specifically, the discharge opening forming region 14) are formed. A male thread 22 is formed on the outer peripheral surface of the mounting wall 16. The upper end portion of the dispensing wall 18 is curled outward in the radial direction. The extension height of the extraction wall 18 is higher than the extension heights of the mounted wall 16 and the locked wall 20. A substantially horizontal circular wall portion 24 is provided at the upper end of the locked wall 20. At the upper end of the outer peripheral surface of the locked wall 20, a first locked protrusion 26 that extends continuously in the circumferential direction and protrudes outward in the radial direction, and the first locked protrusion Auxiliary protrusions 28 that extend continuously in the circumferential direction and project outward in the radial direction are disposed somewhat below the stripes 26. Below the auxiliary protrusion 28 on the outer peripheral surface of the locked wall 20, a first circumferentially locked means 30 is disposed. Although not shown, six first circumferentially engaged means 30 are arranged at equiangular intervals in the circumferential direction. The first circumferentially locked means 30 will be described later. A plurality of ribs 32 extending in the axial direction are formed on the inner peripheral surface of the locked wall 20 at equal angular intervals in the circumferential direction. The rib 32 can regulate the rotation of the lid body 4 relative to the outer lid 6 in cooperation with a predetermined jig when the outer lid 6 is attached to the lid body 4.

  1, the outer peripheral region 8b on the lower surface of the blocking wall 8 includes an annular seal wall 34 extending downward at a substantially intermediate position in the radial direction, and a ratchet positioned at the radially inner end. A recess 36 is formed. The ratchet recess 36 has a well-known structure, and can restrict the rotation of the lid body 4 relative to the outer lid 6 in cooperation with a predetermined jig when the outer lid 6 is attached to the lid body 4. (See JP 2008-273531 A). In the central region 8a of the lower surface of the blocking wall 8, a radially extending inner side of the breakable line 12 extends from the base end connected to the lower surface of the blocking wall 8 so as to incline downward and extend radially outward. The end is also formed with an annular seal piece 38 located outwardly from the breakable line 12 in the radial direction. The seal piece 38 is relatively thin and can be elastically deformed.

  A second locked protrusion 40 that extends continuously in the circumferential direction and projects outward in the radial direction is disposed at the upper end of the outer peripheral surface of the side wall 10. A second circumferentially engaged means 42 is disposed at the lower end of the outer peripheral surface of the side wall 10. Although illustration is omitted, a plurality of second circumferentially engaged means 42 are arranged at equiangular intervals in the circumferential direction. The second circumferentially locked means 42 will be described later. At the lower end portion of the inner peripheral surface of the side wall 10, a locking protrusion 44 that protrudes inward in the radial direction is disposed.

  2 and 3 together with FIG. 1, the outer lid 6 includes a circular top wall 46 and a cylindrical skirt wall 48 depending from the outer peripheral edge of the top wall 46. On the inner surface of the top wall 46, a cylindrical mounting wall 50 that hangs downward at the outer peripheral edge portion and a cylindrical locking wall 52 that hangs downward in the central region are formed. On the inner surface of the top wall 46, a cylindrical liquid retaining piece 54 that hangs downward between the mounting wall 50 and the locking wall 52 as viewed in the radial direction, and a liquid retaining piece 54 and the locking wall as viewed in the radial direction. A cylindrical auxiliary seal piece 56 is also formed that hangs downward from the position 52. A female thread 58 is disposed at the lower end of the inner peripheral surface of the mounting wall 50. A plurality (six in the illustrated embodiment) of protrusions 60 are provided at intervals in the circumferential direction above a portion where the female thread 58 is formed on the inner peripheral surface of the mounting wall 50. A shoulder surface 62 is defined at the lower end of the protrusion 60 with a gap in the circumferential direction. In the illustrated embodiment, each protrusion 60 extends vertically downward from the inner surface of the top wall 46, and the cross-sectional shape of the main part excluding its lower end is rectangular. If desired, instead of positioning the protrusion above the portion of the inner peripheral surface of the mounting wall 50 where the female thread 58 is formed (inward from the inner peripheral surface of the mounting wall 50 in the radial direction) It may be formed on the inner surface of the top wall 46 (with some separation). Further, instead of arranging a plurality of the protrusions at intervals in the circumferential direction, the protrusions may extend continuously in the circumferential direction. When the protrusions extend continuously in the circumferential direction, the shoulder surface is also defined to extend continuously in the circumferential direction.

  In the container lid 2 according to the present invention, it is important that the shoulder surface 62 of the outer lid 6 and / or the free end surface of the mounted wall 16 of the lid body 4 are inclined upward in the radial direction. is there. The shoulder surface 62 of the outer lid 6 and / or the free end surface of the mounted wall 16 is preferably inclined at an inclination angle of 5 to 30 degrees with respect to the horizontal. In the illustrated embodiment, the shoulder surface 62 of the outer lid 6 is inclined 10 degrees upward in the radial direction. A ridge 64 extending downward from the shoulder surface 62 and having a rectangular longitudinal cross-sectional shape is formed on the inner peripheral surface of the mounting wall 50 and on the radially outer end of each shoulder surface 62 (in other words, A plurality of protrusions 64 are formed on the inner peripheral surface of the mounting wall 50 at intervals in the circumferential direction at positions above the female threads 58 and below the shoulder surfaces 62. The outer diameter of the protrusion 64 is larger than the inner diameter of the protrusion 60). If desired, the plurality of protrusions may be continuously extended in the circumferential direction instead of being provided with a plurality of intervals in the circumferential direction. Further, instead of forming the above-mentioned protrusion on the inner peripheral surface of the mounting wall 50 of the outer lid 6, the outer periphery of the upper end portion of the outer peripheral surface of the mounting wall 16 of the lid body 4 where the male screw 22 does not exist. A plurality may be formed on the surface at intervals in the circumferential direction, or the surface may be continuously extended in the circumferential direction.

  2 and FIG. 3, the first locking that extends continuously in the circumferential direction and protrudes inward in the radial direction is provided at the lower end portion of the inner circumferential surface of the locking wall 52. A protrusion 66 is disposed. Below the first locking protrusion 66 on the inner peripheral surface of the locking wall 52, first circumferential locking means 68 is disposed. As clearly understood by referring to FIG. 3, six first circumferential locking means 68 are arranged at equiangular intervals in the circumferential direction, and the first circumferential locking means 68. Each cooperate with each of the first circumferentially engaged means 30 disposed on the lid body 4. That is, when the outer lid 6 rotates clockwise relative to the lid body 4, the first circumferential locking means 68 provided on the outer lid 6 is the first circumferential direction provided on the lid body 4. When the outer lid 6 rotates counterclockwise with respect to the lid body 4, the first circumferential locking means 68 provided on the outer lid 6 is a lid. It is regulated by the first circumferentially locked means 30 provided on the main body 4.

  A breakable line 70 extending in the circumferential direction is formed at the lower end portion of the skirt wall 48, and the skirt wall 48 has a main portion 48 a above the breakable line 70 and a tamper evidence hem below the breakable line 70. A section 48b is partitioned. When viewed in the axial direction, the breakable line 70 is preferably located at the same level as or below the lower end of the mounting wall 50. On the outer peripheral surface of the main portion 48a of the skirt wall 48, a knurl (uneven shape) 72 for preventing slipping of a finger to be hung is formed. A second locking protrusion 74 that extends continuously in the circumferential direction and projects inward in the radial direction is disposed at the upper end portion of the inner circumferential surface of the tamper evidence skirt 48b. A second circumferential locking means 76 is disposed at the lower end of the inner peripheral surface of the tamper evidence skirt 48b. As clearly understood by referring to FIG. 3, a large number of second circumferential locking means 76 are arranged at equiangular intervals in the circumferential direction. Each cooperates with each of the second circumferentially engaged means 42 disposed on the lid body 6. That is, when the outer lid 6 rotates in the clockwise direction with respect to the lid body 4, the second circumferential locking means 76 provided on the outer lid 6 is in the second circumferential direction provided on the lid body 4. When the outer lid 6 rotates counterclockwise with respect to the lid body 4, the second circumferential locking means 76 provided on the outer lid 6 is a lid. It is regulated by the second circumferentially engaged means 42 provided on the main body 4.

  The lid body 4 and the outer lid 6 as described above rotate clockwise when the outer lid 6 is viewed from above with respect to the lid body 4 in a state where the outer lid 6 is fitted on the lid body 4. These female threads 22 are combined with each other by screwing the female threads 58 of the outer lid 6 onto the male threads 22. At this time, as described above, a predetermined jig is applied to the rib 32 and the ratchet recess 36 of the lid body 4 to restrict the rotation of the lid body 4 relative to the outer lid 6. When the outer lid 6 is rotated with respect to the lid body 4 in the above direction and the outer lid 6 is lowered with respect to the lid body 4, the first circumferential locking means 68 in the outer lid 6 is as described above. The first circumferentially locked means 30 in the lid body 4 is elastically overcome and the second circumferentially locked means 76 in the outer lid 6 also replaces the second circumferentially locked means 42 in the lid body 4. Get over elastically. Accordingly, the rotation of the outer lid 6 with respect to the lid body 4 is caused by the cooperation of the first circumferential locking means 30 and the first circumferential locked means 68 and the second circumferential locking means 76 and the second circumferential locking. It is not restricted by cooperating with the direction locked means 42. When the female thread 58 of the outer lid 6 is screwed into the male thread 22 of the lid body 4 and the lid body 4 and the outer lid 6 are combined, they are further disposed on the locking wall 52 of the outer lid 6. The first locking ridge 66 is elastically moved over the first locking ridge 26 disposed on the locked wall 20 of the lid body 4 and is locked below the first locking ridge 26. The second locking ridge 74 disposed on the skirt wall 48 of the lid 6 elastically climbs over the second locking ridge 40 disposed on the side wall 10 of the lid body 4 and below this. It is locked to. The outer lid 6 is rotated with respect to the lid body 4 until the shoulder surface 62 formed on the mounting wall 50 abuts on the free end surface of the mounted wall 16 of the lid body 4. It is attached to. In the state where the outer lid 6 is attached to the lid body 4, the outer circumferential surface of the auxiliary seal piece 56 of the outer lid 6 is the inner circumferential surface of the upper end portion of the pouring wall 18 of the lid body 4 as shown in FIG. 1. Close contact with. Further, the inner surface of the ridge 64 is opposed to the outer peripheral surface of the portion where the male thread 22 at the upper end of the outer peripheral surface of the mounted wall 16 of the lid body 4 is not present (the ridge is opposed to the outer cover 6). Instead of being formed on the inner peripheral surface of the mounting wall 50, the lid main body is formed on the outer peripheral surface of the upper end portion of the outer peripheral surface of the mounting wall 16 of the lid main body 4 where the male thread 22 is not present. 4, the outer surface of the ridge is spaced below the shoulder surface 62 on the inner peripheral surface of the mounting wall 50 of the outer lid 6 and with respect to the region above the female thread 58. Will face each other).

  According to the synthetic resin container lid of the present invention, when the shoulder surface 62 of the outer lid 6 comes into contact with the free end surface of the mounted wall 16 of the lid body 4 and a pressing force is applied to the mounted wall 16, the outer lid 6. Since the free end surface of the mounting wall 16 of the lid body 4 and / or the mounting wall 16 of the lid body 4 is inclined upward radially outward, the mounting wall 16 has a radius rather than a radial inner side. A force is applied outward in the direction. Although it is not always easy to restrict the tilt inward in the radial direction toward the upper side of the mounted wall 16 due to various structural restrictions on the container lid, the radial direction toward the upper side of the mounted wall 16 The outward tilting can be regulated sufficiently easily by disposing the protrusions 64 on the inner peripheral surface of the mounting wall 50 of the outer lid 6 or the outer peripheral surface of the mounted wall 16 of the lid body 4. Thus, according to the synthetic resin container lid of the present invention, the female screw 58 of the outer lid 6 is sufficiently reliably prevented from being excessively engaged with the male screw 22 of the lid body 4.

  The container lid 2 combined as described above is attached to the mouth / neck part 78 of the container by forcibly lowering it to the state shown in FIG. 1 with respect to the mouth / neck part 78 indicated by a two-dot chain line in FIG. Is done. Thus, the locking protrusion 44 formed on the inner peripheral surface of the side wall 10 of the lid body 4 elastically climbs over the locking jaw portion 80 formed on the outer peripheral surface of the mouth-and-neck portion 78 and engages therewith. The lid body 4 is fixed to the mouth / neck portion 78. Further, the sealing wall 34 of the lid main body 4 is caused to enter the mouth / neck portion 78, whereby the mouth / neck portion 78 is sealed.

  When the contents of the container are consumed, a finger is put on the skirt wall 48 of the outer lid 6 and the outer lid 6 attached to the lid body 4 is rotated counterclockwise as viewed from above. When the outer lid 6 is rotated in the above direction with respect to the lid body 4, the female thread 58 formed on the mounting wall 50 of the outer lid 6 and the male thread 22 formed on the lid body 4 are screwed together. The outer lid 6 is lifted with respect to the lid body 4 by being released. At this time, the first locking ridge 66 disposed on the locked wall 20 of the lid body 4 is the first locking ridge 66 disposed on the locking wall 52 of the outer lid 6. And the first circumferential locking means 68 disposed on the locking wall 52 of the outer lid 6 is engaged with the lid body 4. The rotation of the outer lid 6 with respect to the lid body 4 is restricted by the engagement with the first circumferentially engaged means 30 disposed on the stop wall 20. Accordingly, when the outer lid 6 is further rotated in the above direction with respect to the lid body 4, the first locking protrusion 66 and the first locked protrusion 26, the first circumferential locking means 68 and Stress is transmitted to and concentrated on the breakable line 12 provided on the closing wall 8 via the first circumferentially locked means 30, and the breakable line 12 is broken by this force to form a discharge opening. Is done. After the breakable line 12 is broken and the discharge opening is formed in the closing wall 8 of the lid body 4, when the outer lid 6 is further rotated in the above direction with respect to the lid body 4, the discharge opening forming region 14 is closed. 8 and the discharge opening forming region 14 is raised with respect to the lid body 4 together with the outer lid 6. When the discharge opening forming region 14 is removed from the other part of the blocking wall 8, the seal piece 38 is elastically bent and moves above the other part.

  When the outer lid 6 is rotated in the above direction with respect to the lid body 4 and the outer lid 6 is raised with respect to the lid body 4, the second lid disposed on the skirt wall 48 of the outer lid 6 is further provided. The locking protrusion 74 is locked to the second locked protrusion 40 disposed on the side wall 10 of the lid body 4 so that the rise of the outer lid 6 with respect to the lid body 4 is restricted, and the outer lid 6 The second circumferential locking means 76 disposed on the skirt wall 48 is latched to the second circumferentially locked means 42 disposed on the side wall 10 of the lid body 4, and the lid body 4. The rotation of the outer lid 6 with respect to is restricted. Therefore, when the outer lid 6 is further rotated in the above direction with respect to the lid body 4, the second locking protrusion 74 and the second locked protrusion 40, the second circumferential locking means 76, and Stress is transmitted to and concentrated on the breakable line 70 provided on the skirt wall 48 via the second circumferentially engaged means 42, and the breakable line 70 is also broken by this force. Thereafter, the main portion 48a moves upward with rotation while leaving the tamper evident skirt portion 48b and is detached from the lid body 4, thereby exposing the discharge opening generated in the closed wall 8 of the lid body 4. The contents can be discharged through the discharge opening.

  After the required amount of content has been discharged, the outer lid 6 is fitted onto the lid body 4 and then rotated clockwise as viewed from above to form on the inner peripheral surface of the mounting wall 50 of the outer lid 6. The female screw 58 is screwed onto the male screw 22 formed on the outer peripheral surface of the mounted wall 16 of the lid body 4, and the outer lid 6 is lowered with respect to the lid body 4. When the outer lid 6 is rotated in the above direction with respect to the lid body 4 and the outer lid 6 is lowered with respect to the lid body 4, the seal piece 38 is an upper surface of the other portion of the blocking wall 8, although illustration is omitted. The discharge opening forming region 14 is prevented from moving downward and the discharge opening generated in the blocking wall 8 is closed. Thus, the outer lid 6 detached from the lid body 4 is reattached to the lid body 4.

2: Container lid 4: Lid main body 6: Outer lid 16: Mounted wall 22: Male thread 46: Top wall 50: Mounting wall 58: Female thread 60: Projection 62: Shoulder surface 64: Projection

Claims (4)

It is composed of a lid body attached to the mouth and neck of the container and an outer lid attached to the lid body,
The lid body includes a cylindrical mounting wall whose upper end is a free end surface, and a male thread is formed on the outer peripheral surface of the mounting wall.
The outer lid includes a top wall and a cylindrical mounting wall depending from the top wall. A female thread is formed on an inner peripheral surface of the mounting wall, and the female on the inner peripheral surface of the mounting wall is formed. A plurality of protrusions arranged at intervals in the circumferential direction or protrusions extending continuously in the circumferential direction are formed above the portion where the thread is formed or on the inner surface of the top wall. , A shoulder surface is defined which extends continuously in the circumferential direction at intervals in the circumferential direction defined by the lower surface of the protrusion,
The female thread formed on the mounting wall of the outer lid is screwed into the male thread formed on the mounted wall of the lid body, and the shoulder surface of the outer lid is mounted on the mounted surface In a synthetic resin container lid in which the outer lid is attached to the lid body by contacting the free end surface of the wall,
The shoulder surface of the outer lid and / or the free end surface of the mounted wall of the lid body are inclined upwards radially outward;
A synthetic resin container lid.   The synthetic resin container lid according to claim 1, wherein the shoulder surface of the outer lid and / or the free end surface of the mounting wall is inclined at an inclination angle of 5 to 30 degrees with respect to the horizontal.   On the inner peripheral surface of the mounting wall of the outer lid, a plurality of protrusions that are located above the female thread and below the shoulder surface and are spaced apart in the circumferential direction Alternatively, a protrusion extending continuously in the circumferential direction is formed, and the inner diameter of the protrusion is larger than the inner diameter of the protrusion, and when the outer lid is attached to the lid body, the inner surface of the protrusion is 3. The synthetic resin container lid according to claim 1, wherein the upper end of the outer peripheral surface of the mounted wall of the lid main body is opposed to the outer peripheral surface of the portion where the male thread does not exist at a distance.   A plurality of protrusions or circumferentially arranged at intervals in the circumferential direction on the outer circumferential surface of the upper end portion of the outer circumferential surface of the mounted wall of the lid body where the male thread does not exist. And the outer diameter of the protrusion is larger than the inner diameter of the protrusion. When the outer lid is attached to the lid body, the outer surface of the protrusion is the attachment of the outer lid. 3. The synthetic resin container lid according to claim 1, wherein the synthetic resin container lid is opposed to a portion of the inner peripheral surface of the wall below the shoulder surface and above the female thread with a space.