JP5288855B2 - cap - Google Patents

Description

  The present invention relates to a cap in which a cylindrical cap body attached to a container port and a bottomed cylindrical lid body crowned by the cap body are connected by a hinge.

In general, there are caps configured by connecting a cylindrical cap body attached to a container mouth and a bottomed cylindrical lid body crowned by the cap body by a hinge, The hinge includes a hinge body located at the center and a pair of elastic pieces disposed on both sides of the hinge body.
When the lid is turned, when the lid exceeds the time point when the maximum tensile force acts on the pair of elastic pieces (hereinafter referred to as a thought point), the elastic restoring force of the pair of elastic pieces A structure that is rotated in the opening direction or the closing direction at a stroke is adopted. (See Patent Document 1)
Japanese Patent Laid-Open No. 9-66955

  However, in the hinge as described above, if the material is a resin rich in elasticity such as a polyethylene resin (PE resin), the hinge is normally reversed when the point passes, and a satisfactory effect can be obtained. When the hinge is made of a resin with poor elasticity such as polypropylene resin (PP resin), the strength of the hinge is insufficient, and when the lid is rotated, the hinge is plastically deformed beyond its elastic deformation range. Therefore, the hinge cannot be reversed normally at the thought point, and when the lid is closed, the hinge is bent in a plastically deformed state. It started to swell greatly and was not preferable in appearance.

  The present invention has been made in view of such a point, and even if the resin employed is poor in elasticity, a hinge that can be reversed normally at the thought point without causing insufficient strength is provided. An object is to provide a cap having the same.

As a means for solving the above-mentioned problems, the present invention is characterized in that the invention described in claim 1 includes a cylindrical cap body attached to a container mouth, and a bottomed cylindrical lid covered by the cap body. The cap is connected to the body by a hinge, the cap is made of polypropylene resin having poor elasticity, and provided with a longitudinal groove along the circumferential direction on the peripheral wall of each cap portion of the cap body and the lid, Both ends of the hinge are respectively connected to outer peripheral walls located outside the longitudinal groove, and provided on the peripheral wall of the cap body and the body of the lid when the cover is rotated in the closing direction. Each outer peripheral wall is bent so as to close an upper portion of each vertical groove .
Therefore, according to the first aspect of the present invention, when the lid is rotated, the outer peripheral walls provided through the longitudinal grooves on the peripheral walls of the cap main body and the body of the lid are connected to the hinge at a thought point when the lid is rotated. By effectively utilizing the bending elasticity of the hinge, the tensile force acting on the hinge can be reduced, and the hinge does not extend to the plastic deformation region, so that the hinge can be normally reversed normally at the thought point. That is, when the cover body is rotated in the closing direction, each outer peripheral wall provided on the body of the cap body and the peripheral wall of the body of the cover body is bent until the upper part of each vertical groove is closed, so that it acts on the hinge. Tensile force is reduced.
As a result, when the lid is opened and closed, the hinge is inverted within the elastic deformation region at the thought point, so that when the lid is closed, the hinge bulges greatly from the outer peripheral surfaces of the cap body and the lid. There is no.
The invention described in claim 2 is the invention described in claim 1, wherein the hinge is continuous from both sides of the main hinge and a main hinge extending in a substantially horizontal direction at the center in a state where the lid is open. The cap body and the cover body are set to have substantially the same thickness as the outer peripheral wall of the cap body and the lid body, and the thickness of the main hinge and each elastic piece, An annular stepped portion is provided on the outer peripheral surface of the body portion of the lid body so that the lower end surface of the body portion of the lid body abuts in the closed state, and the pair of elastic pieces are connected in the connecting direction of the cap body and the lid body. The length along which the height from the annular step portion of the body portion of the cap body to the bottom of the vertical groove, corresponding to the portion to which the pair of elastic pieces are connected, and the body portion of the lid body in the open state Approximate length that combines the height from the upper end surface to the bottom of the vertical groove It is characterized in being.
Therefore, in the invention of claim 2, the main hinge and the pair of elastic pieces constituting the hinge are connected to the outer peripheral walls provided on the peripheral walls of the body portions of the cap body and the lid body through the vertical grooves, By setting the thickness of the peripheral wall and the thickness of the main hinge and each elastic piece to be substantially the same, when the lid is rotated, the bending elasticity of each outer peripheral wall is effectively used at the thought point. In particular, the tensile force acting on the pair of elastic pieces can be reduced, and the pair of elastic pieces do not extend to the plastic deformation region, so that the pair of elastic pieces can be normally reversed normally at the thought point.
Further, the length of the pair of elastic pieces along the connecting direction of the cap body and the lid body is such that the length of the longitudinal groove from the annular stepped portion of the body portion of the cap body corresponding to the portion to which the pair of elastic pieces is connected. The length is approximately set to the sum of the height to the bottom and the height from the upper end surface of the body portion of the lid in the open state to the bottom of the vertical groove. As a result, if the pair of elastic pieces does not cause plastic deformation at the thought point, when the main hinge and the pair of elastic pieces are closed, the main hinge and the pair of elastic pieces are greatly expanded from the outer peripheral surfaces of the cap body and the lid body. Since it does not come out, it is suitable in terms of design and safety.

  According to the present invention, the flexural elasticity of each outer peripheral wall provided via a longitudinal groove on the peripheral wall of each body portion of the cap body and the lid body, to which the hinge is connected, can be used effectively, so temporarily adopted Even if the resin to be used is poor in elasticity, the hinge can be normally reversed normally at the thought point without the strength of the hinge being insufficient. Moreover, when the lid is opened and closed, it is possible to reduce the tensile force acting on the hinge by effectively using the bending elasticity of each outer peripheral wall at the thought point. When the body is closed, the hinge does not bulge greatly from the outer peripheral surfaces of the cap body and the lid. This not only improves the appearance of the appearance, but is also suitable for safety.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS.
As shown in FIGS. 1 to 10, the caps 1 and 1a according to the first and second embodiments of the present invention are made of polypropylene resin and are cylindrical cap bodies that are attached to a container mouth (not shown). 2 and a bottomed cylindrical lid 3 to be crowned by the cap body 2 are connected by hinges 4 and 4a. In the caps 1 and 1a according to the first and second embodiments, the structures of the hinges 4 and 4a are different, but the cap 1 according to the first embodiment is claimed in the claims. This corresponds to the invention described in .

First, the cap 1 which concerns on the 1st Embodiment of this invention is demonstrated in detail based on FIGS.
As shown in FIGS. 1 and 2, the cap body 2 includes a disk-shaped top surface portion 5 and a cylindrical body portion 6.
The body 6 of the cap body 2 includes a large-diameter body 6a and a small-diameter body 6b integrally connected to the upper end of the large-diameter body 6a. The outer peripheral surface of the large-diameter body 6a and the small-diameter body An annular step portion 6c is formed between the outer peripheral surface of the portion 6b. Moreover, the internal thread part 7 screwed together with the external thread part provided in the outer peripheral surface of the container port is formed in the internal peripheral surface of the large diameter trunk | drum 6a.
As shown in FIGS. 1, 3A and 4, a circumferential hinge to which a main hinge 10 of the hinge 4 and a pair of elastic pieces 11, 11 to be described later are connected is formed on the peripheral wall of the large-diameter body 6 a of the cap body 2. A vertical groove 12 is formed in the range along the circumferential direction, and the peripheral wall is divided into an outer peripheral wall 13 and an inner peripheral wall 14 by the vertical groove 12. As shown in FIG. 1, the arc-shaped outer peripheral wall 13 may have both ends in the circumferential direction spaced apart from the peripheral wall of the large-diameter trunk 6a or may be continuous with the peripheral wall of the large-diameter trunk 6a.
As shown in FIGS. 3A and 4, the vertical groove 12 is formed at a predetermined depth from an annular stepped portion 6c between the outer peripheral surface of the small-diameter barrel portion 6b and the outer peripheral surface of the large-diameter barrel portion 6a. In a range where the hinge 10 is connected, the depth is substantially constant and the depth is deeper than the lower surface of the main hinge 10. On the other hand, in the range where the pair of elastic pieces 11, 11 of the longitudinal groove 12 are connected, the depth is deeper than the lower surface of the pair of elastic pieces 11, 11 and gradually deeper along the inclination of each elastic piece 11, 11. It is formed to become. In the range where the pair of elastic pieces 11, 11 are connected, the outer peripheral wall 13 located outside the vertical groove 12 on the peripheral wall of the body 6 of the cap body 2 to which the pair of elastic pieces 11, 11 are connected. The upper end is inclined downward along the inclination of the pair of elastic pieces 11, 11.
In addition, if the depth of the vertical groove 12 can obtain the bending elasticity of the outer peripheral wall 13 effectively, it is preferable that the depth is shorter in terms of molding and mold. This is because, in molding, the protrusions of the mold obstruct the flow of the resin so as to form the longitudinal grooves 12, and the protrusions become weak portions in terms of the strength of the mold.
However, as described above, the depth of the longitudinal groove 12 is set to be deeper than at least the lower surface of the main hinge 10 and the lower surfaces of the pair of elastic pieces 11, 11, and the main hinge 10 and the pair of elastic pieces 11, 11. It is necessary to effectively use the flexural elasticity of the outer peripheral wall 13 to which is connected.
Further, as will be described later, the width of the vertical groove 12 is such that when the lid 3 is opened and closed, the outer peripheral walls 13 and 13 to which the pair of elastic pieces 11 and 11 are connected at the thought point are connected to the vertical grooves 12. , 12 (see FIG. 5), but if the width of the longitudinal groove 12 is too narrow, the bending elasticity of the outer peripheral walls 13, 13 cannot be used effectively, and at the point of consideration, a pair of elasticity The pair of elastic pieces 11 and 11 are extended to the plastic deformation region by the tensile force acting on the pieces 11 and 11, and the above-described problem cannot be solved. On the other hand, if the width of the longitudinal groove 12 is too wide, the inclination angle of each outer peripheral wall 13, 13 becomes excessively large (the bending elasticity of the outer peripheral wall 13 is excessively used), so that the pair of elastic pieces 11, 11 As a result, an appropriate tensile force does not act on the pair of elastic pieces 11 and 11 so that the elastic force does not reverse at the thought point.
Thus, it is necessary to set the width and depth of the longitudinal groove 12 so that the maximum tensile force acts on the pair of elastic pieces 11 and 11 while securing the inside of the elastic deformation region at the thought point.

The top surface portion 5 of the cap body 2 has a plurality of content outlet holes 15 formed therein. In the present embodiment, the top surface portion 5 is formed with all seven swing holes 15, one is arranged at the approximate center of the top surface portion 5, and the remaining six are approximately the top surface portion 5. It arrange | positions at a 60 degree pitch on the circumference centering on a center.
Further, a sealed cylindrical portion 16 concentrically with the small diameter barrel portion 6 b is suspended from the lower surface of the top surface portion 5 inside the small diameter barrel portion 6 b of the cap body 2. When the cap body 2 is attached to the container mouth, the annular lower end surface of the sealed cylindrical portion 16 is in close contact with the annular upper end surface of the container mouth.

As shown in FIGS. 1 and 2, the lid 3 is formed in a bottomed cylindrical shape including a disk-shaped top surface portion 18 and a cylindrical body portion 17.
On the lower surface of the top surface portion 18 of the lid 3, a plurality of closing rods 19 inserted into the respective swing holes 15 provided in the top surface portion 5 of the cap body 2 are formed at positions corresponding to the respective swing holes 15. The height of the trunk portion 17 of the lid 3 (excluding the thickness of the top surface portion 18) is formed substantially the same as the height of the small-diameter barrel portion 6b of the cap body 2.
As shown in FIGS. 1, 3 </ b> B, and 4, the peripheral wall of the body portion 17 of the lid 3 is within a circumferential range in which a main hinge 10 of the hinge 4 and a pair of elastic pieces 11, 11 described later are connected. A vertical groove 12 is formed along the circumferential direction, and the peripheral wall is divided into an outer peripheral wall 13 and an inner peripheral wall 14 by the vertical groove 12. As shown in FIG. 1, the arc-shaped outer peripheral wall 13 may have both ends in the circumferential direction separated from the peripheral wall of the trunk portion 17 or may be continuous with the peripheral wall of the trunk portion 17.
As shown in FIG. 3B and FIG. 4, the vertical groove 12 is formed at a predetermined depth from the upper end surface of the trunk portion 17 of the lid 3 in the opened state, and the depth is within the range where the main hinge 10 is connected. It is formed to be substantially constant and deeper than the lower surface of the main hinge 10. On the other hand, in the range where the pair of elastic pieces 11, 11 of the longitudinal groove 12 are connected, the depth is deeper than the lower surface of the pair of elastic pieces 11, 11 and gradually deeper along the inclination of each elastic piece 11, 11. It is formed to become. In the range where the pair of elastic pieces 11, 11 are connected, the outer peripheral wall 13 located outside the longitudinal groove 12 on the peripheral wall of the trunk portion 17 of the lid 3 to which the pair of elastic pieces 11, 11 are connected. The upper end is inclined downward along the inclination of the pair of elastic pieces 11, 11.
In addition, the width and depth of the longitudinal groove 12 provided in the lid 3 are also the same as the longitudinal groove 12 provided in the cap body 2, and at the point of consideration, the pair of elastic pieces 11 and 11 are secured within the elastic deformation region. It is necessary to set so that the maximum tensile force acts.

As shown in FIGS. 1 to 4, the hinge 4 has a main hinge 10 that extends in a substantially horizontal direction at the center in a state where the lid 3 is open, and is inclined downward continuously from both sides of the main hinge 10. It is comprised from a pair of elastic piece 11 and 11 extended. The thickness of the main hinge 10 and the pair of elastic pieces 11 and 11 are formed substantially the same. The inclination angle of the pair of elastic pieces 11, 11 is set to an appropriate value of 30 ° to 35 ° with respect to the horizontal plane.
And the upper end of the outer peripheral wall 13 in which both ends of the main hinge 10 of the hinge 4 and the pair of elastic pieces 11, 11 are located outside the vertical groove 12 at the peripheral walls of the trunk portions 6, 17 of the cap body 2 and the lid 3. Are integrally connected to each other.
As shown in FIG. 4, the upper surface of the main hinge 10 is substantially flat when the lid 3 is open, and the upper surface of the main hinge 10 and the outer peripheral surface of the large-diameter trunk portion 6 a of the cap body 2. The annular stepped portion 6c between the outer diameter surface of the small-diameter body portion 6b and the upper end surface of the body portion 17 of the lid body 3 in the open state are located on substantially the same plane. As shown in FIG. 1, the length of the main hinge 10 in the direction orthogonal to the connection direction between the cap body 2 and the lid 3 is orthogonal to the connection direction between the cap body 2 and the lid 3 of the elastic piece 11. It is set to be longer than the length in the direction.
Moreover, as shown in FIG. 4, the thickness of the main hinge 10 and the pair of elastic pieces 11, 11 of the hinge 4, and the outer peripheral walls 13 provided on the peripheral walls of the trunk portions 6, 17 of the cap body 2 and the lid 3. , 13 is set to be substantially the same.
Further, the length of the pair of elastic pieces 11, 11 along the connecting direction of the cap body 2 and the lid body 3 corresponds to the portion to which the pair of elastic pieces 11, 11 are connected. The length from the annular stepped portion 6c of the portion 6 to the bottom of the vertical groove 12 and the length from the upper end surface of the trunk portion 17 of the lid 3 in the open state to the bottom of the vertical groove 12 are substantially set. ing. Thereby, in particular, if the pair of elastic pieces 11 and 11 do not cause plastic deformation at the thought point, as shown in FIG. 6, when the main hinge 10 and the pair of elastic pieces 11 and 11 are capped, as shown in FIG. Since it does not bulge greatly from the outer peripheral surfaces of the large-diameter body 6a of the main body 2 and the body 17 of the lid 3, it is suitable in terms of design and safety.

Next, the operation of the cap 1 according to the first embodiment of the present invention will be described.
When the cap body 2 is attached to the container mouth, the cap body 2 is placed over the container mouth, and the female threaded portion 7 of the large-diameter trunk 6a of the cap body 2 is screwed to the male threaded portion of the container mouth. Then, the annular lower end surface of the sealed cylindrical portion 16 of the cap body 2 is in close contact with the annular upper end surface of the container port.
Then, when the lid 3 is rotated to the thought point in the opening direction or the closing direction, the pair of elastic pieces 11 and 11 of the hinge 4 are gradually pulled, and at the thought point shown in FIG. Maximum tensile force acts on the pieces 11 and 11. However, at that time, as shown in FIG. 5, the hinge 10 of the hinge 4 and the pair of elastic pieces 11, 11 are connected to the peripheral walls of the large-diameter trunk 6 a of the cap body 2 and the trunk 17 of the lid 3. Since the outer peripheral walls 13 and 13 are bent so as to close the upper portions of the vertical grooves 12 and 12, the tensile force acting on the hinge 4, particularly the pair of elastic pieces 11 and 11, is reduced.
Thereafter, when the thought point is passed, the pair of elastic pieces 11 and 11 of the hinge 4 are reversed at a time by the elastic force, and the lid body 3 follows and is rotated at once.

As described above, the cap 1 according to the first embodiment of the present invention is the peripheral wall of the large-diameter body 6a of the cap body 2 and the body 17 of the lid 3, and the main hinge 10 of the hinge 4 and the pair of the caps 1. By providing the longitudinal groove 12 in the circumferential range to which the elastic pieces 11, 11 are connected, the circumferential wall is divided into the outer circumferential wall 13 and the inner circumferential wall 14 by the longitudinal groove 12, and the main hinge 10 and the pair of the hinge 4 are separated. Both ends of the elastic pieces 11, 11 are integrally formed with the outer peripheral walls 13, 13 located outside the longitudinal grooves 12 provided on the peripheral walls of the large-diameter body 6 a of the cap body 2 and the body 17 of the lid 3. Connected.
Thereby, when rotating the lid 3, the outer peripheral wall 13 of the cap body 2 and the lid 3, to which the main hinge 10 of the hinge 4 and the pair of elastic pieces 11, 11 are connected, particularly at the thought point, By effectively utilizing the bending elasticity of 13, the tensile force acting on the hinge 4, in particular, the pair of elastic pieces 11, 11 can be reduced, and the pair of elastic pieces 11, 11 extends to the plastic deformation region. Therefore, the strength of the pair of elastic pieces 11 and 11 is ensured, and the pair of elastic pieces 11 and 11 can be normally reversed normally at the thought point.
In addition, when the lid 3 is opened and closed, the hinge 4, particularly the pair of elastic pieces 11 and 11, does not extend to the plastic deformation region at the point of thought, so when the lid 3 is closed as shown in FIG. The pair of elastic pieces 11, 11 of the hinge 4 does not bulge greatly from the outer peripheral surfaces of the large-diameter trunk 6 a of the cap body 2 and the trunk 17 of the lid 3. This not only improves the appearance of the appearance, but is also suitable for safety.

Next, the cap 1a according to the second embodiment of the present invention will be described in detail with reference to FIGS. In the description of the cap 1a according to the second embodiment, only differences from the cap 1 according to the first embodiment will be described.
As shown in FIGS. 7 to 10, the hinge 4 a includes a main hinge 10 that extends in a substantially horizontal direction at the center in a state where the lid 3 is open, and the main hinge 10 along both sides of the main hinge 10. Is also composed of a pair of independent elastic pieces 11 and 11 that are positioned below and extend substantially in the horizontal direction. As is well understood from FIGS. 9 and 10, the pair of elastic pieces 11, 11 are disposed below the main hinge 10 and approximately half the height of the body portion 17 of the lid 3. Moreover, the thickness of the main hinge 10 and the thickness of the pair of elastic pieces 11, 11 are formed substantially the same.

A longitudinal groove 12 is formed in the circumferential wall of the large-diameter body 6a of the cap body 2 along the circumferential direction in the circumferential range to which the main hinge 10 of the hinge 4a is connected. It is divided into an outer peripheral wall 13 and an inner peripheral wall 14. The vertical groove 12 is formed at a predetermined depth from the annular stepped portion 6c between the outer peripheral surface of the small diameter barrel portion 6b and the outer peripheral surface of the large diameter barrel portion 6a.
On the other hand, a longitudinal groove 12 is formed on the peripheral wall of the body portion 17 of the lid body 3 along the circumferential direction in a circumferential range to which the main hinge 10 of the hinge 4a is connected. 13 and the inner peripheral wall 14. The vertical groove 12 is formed at a predetermined depth from the upper end surface of the body portion 17 of the lid 3 in the opened state.
The longitudinal grooves 12 provided in the cap body 2 and the lid 3 are formed so that the depth thereof is substantially constant and deeper than the lower surface of the main hinge 10, and the width of the longitudinal grooves 12 is the first width. Similarly to the embodiment, it is necessary to set the pair of elastic pieces 11 and 11 so that the maximum tensile force acts on the pair of elastic pieces 11 and 11 while ensuring the inside of the elastic deformation region.
Further, as shown in FIG. 9, a circumferential range in which the pair of elastic pieces 11, 11 of the hinge 4 a is connected to the outer peripheral walls of the large-diameter trunk 6 a of the cap body 2 and the trunk 17 of the lid 3. In addition, a recess 20 is provided within a predetermined height range from the upper end.

The hinge 4a is integrally formed with the upper end of the outer peripheral wall 13 positioned outside the vertical groove 12, with both ends of the main hinge 10 being the peripheral walls of the large-diameter body 6a of the cap body 2 and the body 17 of the lid 3. On the other hand, both ends of the pair of elastic pieces 11, 11 are connected to the lower ends of the recessed portions 20 provided on the outer peripheral walls of the large-diameter body 6 a of the cap body 2 and the body 17 of the lid 3. The
As shown in FIG. 10, the main hinge 10 of the hinge 4a has a flat upper surface when the lid 3 is open, and the upper surface of the main hinge 10 and the large-diameter body 6a of the cap body 2 are formed. The annular stepped portion 6c between the outer peripheral surface and the outer peripheral surface of the small-diameter barrel portion 6b and the upper end surface of the trunk portion 17 of the lid body 3 in the open state are located on substantially the same plane. As shown in FIGS. 7 and 9, the length of the main hinge 10 in the direction orthogonal to the connecting direction between the cap body 2 and the lid 3 is the connection between the cap body 2 and the lid 3 of the elastic piece 11. It is set longer than the length in the direction orthogonal to the direction.
Moreover, as shown in FIG. 10, the thickness of the main hinge 10 of the hinge 4a is substantially the same as the thickness of the outer peripheral walls 13 and 13 provided on the peripheral walls of the body portions 6 and 17 of the cap body 2 and the lid body 3. Is set to
The length of the pair of elastic pieces 11, 11 along the connecting direction of the cap body 2 and the lid 3 is from the annular stepped portion 6 c of the body portion 6 of the cap body 2 to the position where the elastic piece 11 is connected. Is approximately set to a length obtained by combining the height from the upper end surface of the body portion 17 of the lid 3 in the opened state to the position where the elastic piece 11 is connected. Thereby, in particular, when the pair of elastic pieces 11, 11 do not cause plastic deformation at the thought point, when the main hinge 10 and the pair of elastic pieces 11, 11 are closed, the large-diameter trunk portion of the cap body 2. Since it does not bulge greatly from the outer peripheral surface of 6a and the trunk | drum 17 of the cover body 3, it is suitable in a design surface and a safety surface.

Next, the operation of the cap 1a according to the second embodiment of the present invention will be described.
After the cap body 2 is screwed into the container mouth, when the lid 3 is rotated to the thought point in the opening direction or the closing direction, in particular, the pair of elastic pieces 11, 11 of the hinge 4a are gradually pulled. At the thought point, the maximum tensile force acts on the pair of elastic pieces 11 and 11. However, at this time, the outer peripheral walls 13 and 13 provided on the large-diameter body 6a of the cap body 2 and the body 17 of the lid 3 to which the main hinge 10 of the hinge 4a is connected are the upper portions of the vertical grooves 12 and 12, respectively. Therefore, the tensile force acting on the hinge 4a, in particular, the pair of elastic pieces 11, 11 is reduced.
Thereafter, when the thought point is passed, the pair of elastic pieces 11, 11 of the hinge 4 a are reversed at a time by the elastic force, and the lid body 3 follows and rotates at once.

As described above, in the cap 1a according to the second embodiment of the present invention, the main hinge 10 of the hinge 4a is connected to the large-diameter body 6a of the cap body 2 and the peripheral wall of the body 17 of the lid 3. By providing the vertical groove 12 in the circumferential range, the peripheral wall is divided into the outer peripheral wall 13 and the inner peripheral wall 14 by the vertical groove 12, and both ends of the main hinge 10 of the hinge 4a are connected to the large diameter of the cap body 2. The outer peripheral walls 13, 13 located on the outer side of the longitudinal groove 12 provided on the peripheral wall of the body portion 6 a and the body portion 17 of the lid 3 are integrally connected.
Thereby, when the lid 3 is rotated, the bending elasticity of the outer peripheral walls 13 and 13 of the cap body 2 and the lid 3 to which the main hinge 10 of the hinge 4a is connected, particularly at the thought point, is effectively used. Thus, the tensile force acting on the hinge 4a, particularly the pair of elastic pieces 11, 11, can be reduced, and the pair of elastic pieces 11, 11 do not extend to the plastic deformation region. , 11 is ensured, and the pair of elastic pieces 11, 11 can always be reversed normally at the thought point.
In addition, when the lid 3 is opened and closed, the pair of elastic pieces 11 and 11 of the hinge 4a do not extend to the plastic deformation region at the thought point. Therefore, when the lid 3 is closed, the pair of elastic pieces of the hinge 4a is closed. 11 and 11 do not bulge greatly from the outer peripheral surfaces of the cap body 2 and the lid 3 (see FIG. 6). This not only improves the appearance of the appearance, but is also suitable for safety.

Thus, in the caps 1 and 1a according to the first and second embodiments of the present invention, when the lid 3 is rotated, both ends of the hinges 4 and 4a are connected. Since the bending elasticity of each outer peripheral wall 13 of the body 3 can be used effectively, even if the resin employed is poor in elasticity, the hinges 4 and 4a do not have insufficient strength, and the hinge 4 4a can be reversed normally at the thought point.
In addition, when the lid 3 is opened and closed, by effectively utilizing the bending elasticity of the outer peripheral walls 13 of the cap body 2 and the lid 3 at the thought point, in particular, the pair of elastic pieces 11, The pair of elastic pieces 11, 11 of the hinges 4, 4 a are closed when the lid 3 is closed because the pair of elastic pieces 11, 11 do not extend to the plastic deformation region. The cap body 2 and the lid body 3 do not bulge greatly from the outer peripheral surface, which is suitable in terms of appearance and safety.
Furthermore, in the caps 1 and 1a according to the first and second embodiments of the present invention, at the thought point, a large tensile force that extends to the plastic deformation region does not act on the pair of elastic pieces 11 and 11. The durability is improved, and the pair of elastic pieces 11 and 11 of the hinges 4 and 4a can always be normally reversed from the thought point. Further, even when an unexpected impact is applied to the hinges 4 and 4a when the lid 3 is opened and closed, the outer peripheral walls of the cap body 2 and the lid 3 are connected to both ends of the hinges 4 and 4a. Since it can be absorbed by the bending elasticity of 13, it is very effective for impact resistance.

FIG. 1 is a plan view of the cap according to the first embodiment of the present invention with the lid open. 2 is a cross-sectional view taken along line AA in FIG. 3A is a view of the cap body side as seen in a cross section taken along line BB in FIG. FIG. 3B is a view of the lid body side in a cross section taken along line BB in FIG. 1. FIG. 4 is an enlarged view of the hinge portion of FIG. FIG. 5 is a cross-sectional view of the cap of FIG. 1 when a pair of elastic pieces reach a thought point. FIG. 6 is a side view of the cap of FIG. 1 with the lid closed. FIG. 7 is a plan view of the cap according to the second embodiment of the present invention with the lid open. 8 is a cross-sectional view taken along the line CC of FIG. FIG. 9 is a view of the cap main body side in a cross section taken along line DD of FIG. FIG. 10 is an enlarged view of the hinge portion of FIG.

Explanation of symbols

  1, 1a cap, 2 cap body, 3 lid, 4, 4a hinge, 6, 17 body, 6a large diameter body, 6b small diameter body, 10 main hinge, 11 elastic piece, 12 vertical groove, 13 outer peripheral wall

Claims (2)

A cap in which a cylindrical cap body attached to the container mouth and a bottomed cylindrical lid body crowned by the cap body are connected by a hinge,
The cap is made of polypropylene resin having poor elasticity,
A longitudinal groove along the circumferential direction is provided on the peripheral wall of each body portion of the cap body and the lid, and both ends of the hinge are connected to outer peripheral walls located outside the vertical groove, respectively.
When the cover body is rotated in the closing direction, each outer peripheral wall provided on the body portion of the cap body and the peripheral wall of the body portion of the cover body is bent so as to close the upper portion of each vertical groove. To cap. The hinge includes a main hinge extending in a substantially horizontal direction at the center in a state where the lid is open, and a pair of elastic pieces extending obliquely downward continuously from both sides of the main hinge,
The thickness of each outer peripheral wall of the cap body and the lid, and the thickness of the main hinge and each elastic piece is set to be substantially the same,
On the outer peripheral surface of the body portion of the cap body is provided with an annular stepped portion that abuts the lower end surface of the body portion of the lid body in a closed state,
  The length of the pair of elastic pieces along the connecting direction of the cap main body and the lid body is from the annular stepped portion of the trunk portion of the cap main body corresponding to the portion to which the pair of elastic pieces are connected. The length to the bottom of a vertical groove, and the length which match | combined with the height from the upper end surface of the trunk | drum of the said cover body to the bottom of the said vertical groove are substantially set to Claim 1 characterized by the above-mentioned. The described cap.

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