Hinge mechanism

Abstract

This invention provides a hinge mechanism that enables the second member to be stopped at a predetermined angle relative to the first member, while simultaneously achieving both monomaterial construction and durability. [Solution] The hinge mechanism connecting the first member and the second member comprises a protrusion on the first member side, a protrusion on the second member side, a first pin that penetrates the protrusion on the first member side and is inserted into the protrusion on the second member side, a first annular protrusion formed on the surface of the protrusion on the second member side facing the protrusion on the first member side, and a first rib. The outer circumferential surface of the first annular protrusion has one or more first polygonal surfaces, and the outer circumferential surface of the second annular protrusion has one or more second polygonal surfaces. When the second member is open to the first member at a predetermined angle, the first polygonal surfaces are in surface contact with the first plane of the first rib, and the second polygonal surfaces are in surface contact with the second plane of the second rib.

Description

Technical Field

[0001] The present invention relates to a hinge mechanism.

Background Art

[0002] As a container with a lid having a lid body for opening and closing an opening of a container body, there is one provided with a hinge mechanism for fixing the lid body at a predetermined angle.

[0003] For example, Patent Document 1 describes an electrical connection box capable of stopping a lid body at a desired opening angle. The electrical connection box has a connection box body and a lid body covering the connection box body, and has a hinge mechanism provided with a shaft portion on either the connection box body or the lid body and a bearing on the other. The shaft portion is formed in a polygonal cross-section, and the bearing is formed in a polygonal shape that is flexible in the diameter-expanded direction and matches the shaft portion.

[0004] Patent Document 2 describes a container using a hinge engagement configured to be able to stop a lid at a predetermined angle. An inclined surface that is inclined upward from a surface of the lid in contact with the container body and contacts a surface of an engagement portion of the container body is provided at a rear end portion of the lid of the container. The shaft of the container is rotatably held in a groove by a convex portion, and when the lid is opened, the shaft rotates in the groove and the inclined surface moves along a curved surface portion of the surface of the engagement portion. When the inclined surface abuts against a vertical portion of the surface of the engagement portion, the lid is stopped in a state inclined with respect to the container body.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In recent years, efforts toward material recycling have been advocated to realize a circular economy, and efforts toward monomaterialization are being actively promoted for items such as cosmetic compact containers, which have a structure in which a first component and a second component are connected via a hinge mechanism. On the other hand, durability is often required for such items, and balancing monomaterialization with ensuring durability is a challenge.

[0007] In the electrical junction box described in Patent Document 1 above, the bearing is fitted to the shaft with its respective polygonal surfaces aligned, and when the lid is opened and closed, the bearing is forcibly expanded in diameter by contact with the shaft, allowing the lid to rotate in stages. Therefore, if the lid is opened and closed repeatedly, the bearing will gradually deteriorate.

[0008] Furthermore, in the container described in Patent Document 2 above, when the inclined surface comes into contact with the vertical portion of the surface of the engaging part, stress is generated near the end of the engaging part of the container body and near the rear end of the inclined surface of the lid, which may lead to damage to the engaging part and near the rear end of the inclined surface. In addition, repeated occurrence of the above stress accelerates the deterioration over time of the end of the engaging part of the container body and near the rear end of the inclined surface of the lid.

[0009] This invention is based on the above background and aims to provide a hinge mechanism that can stop a second member at a predetermined angle relative to a first member, while simultaneously achieving monomaterialization and ensuring durability. [Means for solving the problem]

[0010] One aspect of the present invention for achieving the above objective is a hinge mechanism for connecting a first member and a second member, comprising: a first member-side projection formed on the first member-side end edge of the first member; and a second member-side projection formed on the second member-side end edge of the second member, wherein the first member-side projection has a through hole on the surface facing the second member-side projection and intersecting the axis of the hinge mechanism; and the second member-side projection has a bearing hole on the surface facing the first member-side projection and intersecting the axis of the hinge mechanism, and penetrates the first member-side projection and beyond The bearing comprises a pin whose end is inserted into the protrusion on the second member side, an annular protrusion formed on the surface of the protrusion on the second member side facing the protrusion on the first member side along the circumference of the bearing hole, and a rib formed on the surface of the protrusion on the first member side facing the protrusion on the second member side, having a flat surface on the side facing the annular protrusion, wherein the outer circumferential surface of the annular protrusion has a curved surface and one or more polygonal surfaces, and the polygonal surfaces are formed to be in surface contact with the flat surface of the rib when the second member is open to the first member at a predetermined angle.

[0011] Further issues disclosed in this application, and methods for solving them, will be made clear in the section on embodiments for carrying out the invention and in the drawings. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a hinge mechanism that can stop a second member at a predetermined angle relative to a first member, while simultaneously achieving both monomaterial construction and ensuring durability. [Brief explanation of the drawing]

[0013] [Figure 1A] This figure shows the appearance of the container when the lid is closed. [Figure 1B] This figure shows the appearance of the container when the lid is open to approximately 135 degrees. [Figure 1C] This figure shows the appearance of the container when the lid is open to approximately 180 degrees. [Figure 2A] This is an exploded perspective view of the container body and lid, viewed from the rear right and slightly above. [Figure 2B] It is an exploded perspective view of the container body and the lid as viewed obliquely upward from the rear left side. [Figure 3A] It is a diagram showing the state of the stop mechanism when the lid is closed. [Figure 3B] It is a diagram showing the state of the stop mechanism when the lid is opened about 135°. [Figure 3C] It is a diagram showing the state of the stop mechanism when the lid is opened about 180°.

Embodiments for Carrying Out the Invention

[0014] Embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings used in the following description, the same or similar parts may be denoted by the same reference numerals and redundant descriptions may be omitted.

[0015] Hereinafter, as an example of an article having a configuration in which a first member and a second member are connected via a hinge mechanism, a compact container having a configuration in which a container body 2 as the first member and a lid 3 as the second member are connected via a hinge mechanism will be taken up.

[0016] In the following description, the definitions of the directions (up and down, left and right, front and back) in the article are merely for convenience of explanation, and the definitions of the directions in the article can be appropriately changed according to the functions and uses of the article.

[0017] In the following description, when two members are described as "non-contact", "not in contact", etc., it does not necessarily mean only a state where the two members are not completely (physically) in contact, but includes a state where the two members are in contact to such an extent that no frictional force that impairs the function of the present invention or the practicality of the container is generated.

[0018] In the following description, when simply referring to a "surface", it shall have a broad meaning including both "plane" and "curved surface".

[0019] [First Embodiment]

[0020] Figures 1A to 1C show the external appearance of a lidded container (hereinafter referred to as "container 1") having a container body 2 (first member) and a lid 3 (second member) that opens and closes the opening of the container body 2, as described as a first embodiment of the present invention. Container 1 is a so-called "compact container," and the container body 2 stores contents such as cosmetics.

[0021] Figure 1A shows the external appearance of container 1 when the lid 3 is closed, Figure 1B shows the external appearance of container 1 when the lid 3 is open to approximately 135°, and Figure 1C shows the external appearance of container 1 when the lid 3 is open to approximately 180°. In Figures 1B and 1C, container 1 is shown cut along the line X-X' shown in Figure 1A to make its structure easier to understand.

[0022] As shown in Figures 1A to 1C, the container body 2 is a flat box shape with a bottom surface at the bottom and an open top. The lid 3 is also a flat box shape with a top surface at the top and an open bottom.

[0023] The container body 2 and the lid 3 are connected in a rotatable manner by a hinge mechanism. The hinge mechanism includes a mechanism (hereinafter referred to as the "stop mechanism") that allows the lid 3 to be fixed (held, stopped) at a predetermined angle relative to the container body 2.

[0024] In this embodiment, the three mutually orthogonal directions are defined as the front-to-back direction, the left-to-right direction, and the up-and-down direction, and these three directions are defined individually for the container body 2 and the lid 3, respectively. Specifically, the front-to-back direction and the left-to-right direction are defined assuming that the openings of the container body 2 and the lid 3 are rectangular in shape with sides in the front-to-back direction and the left-to-right direction, and that the container body 2 and the lid 3 are connected at the rear end by a hinge mechanism having a rotation axis in the left-to-right direction. Furthermore, the up-and-down direction is defined assuming that the bottom surface of the container body 2 is facing downwards when the container 1 is in the closed state. In the attached drawings, the up-and-down, front-to-back, and left-to-right directions in the container body 2 are indicated by solid double-headed arrows, and the up-and-down, front-to-back, and left-to-right directions in the lid 3 are indicated by dashed double-headed arrows.

[0025] According to the above regulations, as shown in Figure 1A, when the lid 3 is closed, the vertical and horizontal directions of the container body 2 and the lid 3 coincide. Also, as shown in Figure 1B or Figure 1C, when the lid 3 is open, the vertical and horizontal directions of the container body 2 and the lid 3 do not coincide.

[0026] The container body 2, the lid 3, and the pins (the first pin 4R and the second pin 4L described later) that are components of the hinge mechanism are all made of the same resin material (for example, PET (polyethylene terephthalate)), and the entire container 1 is constructed as a monomaterial. A mirror or the like is separately attached to the inner top surface of the lid 3.

[0027] As shown in Figure 1B or Figure 1C, a hook 31 protruding downward is formed at the front end of the lid 3. In addition, a locking piece 21 that engages with the hook 31 of the lid 3 is formed on the front end surface of the container body 2. When the container 1 is closed, the hook 31 and the locking piece 21 engage, preventing the lid 3 from opening unintentionally.

[0028] Figures 2A and 2B are perspective views showing the container 1 disassembled into a container body 2 and a lid 3. Figure 2A is a disassembled perspective view of the container body 2 and lid 3 viewed from a diagonal upward-right rear direction, with the orientation of the container 1 in the closed state as the reference point. Figure 2B is a disassembled perspective view of the container body 2 and lid 3 viewed from a diagonal upward-left rear direction, with the orientation of the container 1 in the closed state as the reference point.

[0029] As shown in Figure 2A or Figure 2B, protrusions (hereinafter referred to as the first body-side protrusion 23R (first member-side first protrusion) and the second body-side protrusion 23L (first member-side second protrusion)) are formed at the right and left ends of the rear end of the container body 2, respectively. Between the first body-side protrusion 23R and the second body-side protrusion 23L, a body-side recess 24 is formed, which is the portion into which the lid-side protrusion 32, described later, will be accommodated.

[0030] A first through-hole 231R is formed along the left-right direction in the protrusion 23R on the first main body side, through which the first pin 4R is inserted. In addition, a second through-hole 231L is formed along the left-right direction in the protrusion 23L on the second main body side, through which the second pin 4L is inserted.

[0031] The rear end of the lid 3 has a roughly rectangular parallelepiped-shaped projection 32 (second member side projection) that protrudes downward. The lower side of the projection 32 is formed with a roughly semicircular cross-section to prevent it from contacting the container body 2 when opening or closing the lid 3.

[0032] As shown in Figure 2A, a first notch 34R is formed to the right of the lid-side protrusion 32, with a shape that accommodates the first body-side protrusion 23R of the container body 2. To prevent contact with the container body 2 when opening and closing the lid 3, the portion of the lid 3 corresponding to the upper surface of the first notch 34R is formed as a curved surface that protrudes upward.

[0033] As shown in Figure 2B, a second notch 34L is formed to the left of the lid-side protrusion 32, with a shape that accommodates the second body-side protrusion 23L of the container body 2. To prevent contact with the container body 2 when opening and closing the lid 3, the portion of the lid 3 corresponding to the upper surface of the second notch 34L is formed as a curved surface that protrudes upward.

[0034] As shown in Figure 2A, a first bearing hole 322R is formed on the first end face 320R on the right side of the lid-side protrusion 32, into which the tip portion of the first pin 4R is inserted.

[0035] As shown in Figure 2B, a second bearing hole 322L is formed on the second end face 320L on the left side of the lid-side protrusion 32, into which the tip portion of the second pin 4L is inserted.

[0036] As shown in Figure 2A, a first annular projection 323R is formed around the first bearing hole 322R of the first end face 320R of the lid-side projection 32.

[0037] As shown in Figure 2B, a second annular projection 323L is formed around the second bearing hole 322L on the second end face 320L of the lid-side projection 32.

[0038] The hinge mechanism includes a first hinge portion comprising a first pin 4R, a first through hole 231R, and a first bearing hole 322R, and a second hinge portion comprising a second pin 4L, a second through hole 231L, and a second bearing hole 322L. Since the first and second hinge portions are symmetrical, the first hinge portion will be described below.

[0039] The first pin 4R is substantially cylindrical, and a flange-shaped first engaging projection 41R is formed around the first pin 4R at a predetermined position in the longitudinal direction of its circumferential surface. The length of the portion of the first pin 4R to the right of the position where the first engaging projection 41R is formed is approximately the same as the length of the first through hole 231R in the left-right direction, and the length of the portion of the first pin 4R to the left of the position where the first engaging projection 41R is formed is approximately the same as the depth of the first bearing hole 322R of the cover-side protrusion 32.

[0040] The first pin 4R is inserted into the first through hole 231R from the right end face of the first body-side projection 23R, and its tip is inserted into the first bearing hole 322R of the cover-side projection 32. When inserting the first pin 4R into the first through hole 231R from the right end face of the first body-side projection 23R, the first engaging projection 41R engages with the exit portion of the first through hole 231R (the left end face of the first body-side projection 23R), thereby preventing the first pin 4R from coming out.

[0041] The first pin 4R has a cotter pin structure and has a first notch 42R formed along its entire longitudinal direction and to a depth that reaches the central axis of the first pin 4R. The first pin 4R shrinks in diameter when a compressive force is applied to its circumferential surface in the opposite direction to the radial direction ((direction of the center of the rotation axis (radial inward relative to the rotation axis))). As a result, when inserting the first pin 4R into the first through hole 231R, the first pin 4R can be easily inserted into the first through hole 231R by compressing its side surface in the opposite direction to the radial direction. Furthermore, as will be described later, the first pin 4R also functions as a buffer (absorber) that absorbs the above-mentioned compressive force applied from the outside.

[0042] To prevent looseness between the container body 2 and the lid 3, the diameter of the first pin 4R is slightly larger than that of the first through hole 231R. Furthermore, to ensure ease of insertion of the first pin 4R into the first through hole 231R and ease of engagement of the first engaging projection 41R, the first pin 4R may be formed with a smaller diameter at its tip.

[0043] <Stop mechanism> As shown in Figure 2B, a first front rib 233R (first rib) extending in the vertical direction is formed on the front side of the first through hole 231R of the first end face 232R on the left side of the first main body side protrusion 23R. Also, a first rear rib 234R extending in the vertical direction is formed on the rear side of the first through hole 231R of the first end face 232R. The first front rib 233R has a first plane 2331R on the side facing the first annular protrusion 323R.

[0044] As shown in Figure 2A, a second front rib 233L (second rib) extending in the vertical direction is formed on the front side of the second through hole 231L of the second end face 232L on the left side of the second main body side protrusion 23L. Also, a second rear rib 234L extending in the vertical direction is formed on the rear side of the second through hole 231L of the second end face 232L. The second front rib 233L has a second flat surface 2331L on the side facing the second annular protrusion 323L.

[0045] The first front rib 233R reinforces the first main body protrusion 23R and also functions as an element of the aforementioned stop mechanism.

[0046] The second front rib 233L reinforces the second main body protrusion 23L and also functions as an element of the aforementioned stop mechanism.

[0047] The first rear rib 234R reinforces the first main body side protrusion 23R and, at its top surface, contacts the top surface of the first annular protrusion 323R of the lid side protrusion 32, thereby preventing rattling of the lid 3.

[0048] The second rear rib 234L reinforces the second main body side protrusion 23L and, at its top surface, contacts the top surface of the second annular protrusion 323L of the lid side protrusion 32, thereby preventing rattling of the lid 3.

[0049] As shown in Figure 2A, the outer surface of the first annular protrusion 323R has a circular cross-section when viewed from the axial direction (hereinafter referred to as the "first curved surface 324R") and a first polygonal surface 325R (hereinafter referred to as the "first polygonal surface 325Ra" and the "first polygonal surface 325Rb" respectively) which has a cross-section when viewed from the axial direction that corresponds to two adjacent sides of a regular octagon. As shown in the figure, the first curved surface 324R (first polygonal surface 325Ra, first polygonal surface 325Rb) occupies about 3 / 4 of the entire outer surface of the first annular protrusion 323R, and the remaining portion is the first polygonal surface 325R.

[0050] As shown in Figure 2B, the outer surface of the second annular protrusion 323L has a circular cross-section when viewed from the axial direction (hereinafter referred to as the "second curved surface 324L") and a second polygonal surface 325L (hereinafter referred to as the "second polygonal surface 325La" and the "second polygonal surface 325Lb" respectively) which has a cross-section when viewed from the axial direction that corresponds to two adjacent sides of a regular octagon. As shown in the figure, the second curved surface 324L (second polygonal surface 325La, second polygonal surface 325Lb) occupies about 3 / 4 of the entire outer surface of the second annular protrusion 323L, and the remaining portion is the second polygonal surface 325L.

[0051] The first front rib 233R, the first polygonal surface 325R, the second front rib 233L, and the second polygonal surface 325L constitute a stop mechanism. Of these, the mechanism formed on the right side of the container 1 using the first front rib 233R and the first polygonal surface 325R is called the "first stop mechanism," and the mechanism formed on the left side of the container 1 using the second front rib 233L and the second polygonal surface 325L is called the "second stop mechanism." Since the first stop mechanism and the second stop mechanism are symmetrical, the first stop mechanism will be described below.

[0052] Figures 3A to 3C illustrate the first stop mechanism. Of these, Figure 3A is a perspective view of the first stop mechanism when the lid 3 is closed, viewed from the right side of the container 1; Figure 3B is a perspective view of the first stop mechanism when the lid 3 is open to about 135°, viewed from the right side of the container 1; and Figure 3C is a perspective view of the first stop mechanism when the lid 3 is open to about 180°, viewed from the right side of the container 1.

[0053] As shown in Figure 3A, when the lid 3 is closed, the first curved surface 324R of the outer circumferential surface of the first annular projection 323R faces the first front rib 233R. Here, the first curved surface 324R is formed to a length such that its radius does not come into contact with the first front rib 233R, and in this state, the first front rib 233R and the first annular projection 323R do not interfere with each other. Therefore, when the lid 3 is closed, no stress is applied to the container 1, and deterioration of the container 1 over time can be suppressed.

[0054] As shown in Figure 3B, when the lid 3 is open to approximately 135°, the first polygonal surface 325Ra of the outer circumferential surface of the first annular projection 323R is in surface contact with the first front rib 233R. In this state, even if an external force is applied that attempts to change the angle of the lid 3, the lid 3 receives a force (resistance) in the opposite direction from the first front rib 233R through the contact surface, and the lid 3 is stably maintained in this state (open to approximately 135°).

[0055] As shown in Figure 3C, when the lid 3 is open to approximately 180°, the first polygonal surface 325Rb of the outer circumferential surface of the first annular projection 323R is in surface contact with the first front rib 233R. In this state, even if an external force is applied that attempts to change the angle of the lid 3, the lid 3 receives a force (resistance force) in the opposite direction from the first front rib 233R through the contact surface, and the lid 3 is stably maintained in this state (open to approximately 180°).

[0056] For example, when a user rotates the lid 3 to open it from a closed position to approximately 135°, it is necessary to rotate the lid 3 against the resistance force generated when the corner E1 of the first polygonal surface 325Ra contacts the first plane 2331R of the first front rib 233R (when overcoming the corner E1). As a result, a strong force is generated from the first front rib 233R towards the first annular projection 323R. However, this force is buffered (absorbed) by the reduction in diameter of the first pin 4R, which has a cotter pin structure, so excessive stress is not applied to the first annular projection 234. Therefore, it is possible to suppress the aging deterioration of the first annular projection 323R and the first front rib 233R due to repeated operation.

[0057] Furthermore, for example, when a user rotates the lid 3 to close it from an open position of approximately 180° to a position of approximately 135°, it is necessary to rotate the lid 3 against the resistance force generated when the corner E2 of the first polygonal surface 325Ra contacts the first plane 2331R of the first front rib 233R (when overcoming the corner E2). As a result, a large force is generated from the first front rib 233R in the direction of the first annular projection 323R. However, this force is buffered (absorbed) by the reduction in diameter of the first pin 4R, which has a cotter pin structure, so excessive stress is not applied to the first annular projection 234. Therefore, it is possible to suppress the aging deterioration of the first annular projection 323R and the first front rib 233R due to repeated operation of the lid 3.

[0058] Thus, in this embodiment, when opening or closing the lid 3 of the container 1, the stress generated in the first annular protrusion 323R and the first front rib 233R is relieved by the pins having a cotter pin structure (first pin 4R, second pin 4L), thereby suppressing deterioration of the container 1 over time.

[0059] Furthermore, when corner E1 or corner E2 comes into contact with the first plane 2331R of the first front rib 233R or the second plane 2331L of the second front rib 233L (when the first plane 2331R or the second plane 2331L goes over corner E1 or corner E2), the user will feel a click, thus informing the user that the opening angle of the lid 3 has reached an angle at which it can be stopped (fixed, held) by the stop function.

[0060] As described in detail above, the container 1 of this embodiment is equipped with a stop mechanism (first stop mechanism and second stop mechanism), which allows the lid 3 to be stopped at a predetermined angle. Furthermore, the first polygonal surface 325R is in contact with the first plane 2331R of the first front rib 233R, and the second polygonal surface 325L is in contact with the second plane 2331L of the second front rib 233L. As a result, looseness is less likely to occur between the container body 2 and the lid 3, and the lid 3 can be reliably held (stopped) at a predetermined angle (135°, 180°) relative to the container body 2.

[0061] Furthermore, the stress generated in the first annular protrusion 323R and the first front rib 233R when the user opens or closes the lid 3 is buffered (absorbed) by the cotter pin structure of the pins (first pin 4R, second pin 4L), thereby suppressing deterioration of the container 1 over time and ensuring durability.

[0062] Furthermore, container 1 can be constructed from a common resin material consisting of a container body 2, a lid 3, and pins (first pin 4R, second pin 4L), thereby realizing a container 1 that achieves both monomaterial construction and durability.

[0063] Furthermore, since the container 1 of this embodiment has a hinge mechanism using pins (the first pin 4R and the second pin 4L described later), it has the characteristic that the container body 2 and the lid 3 are difficult to separate.

[0064] Furthermore, since structures such as the first annular protrusion 323R and the second annular protrusion 323L are not exposed to the outside, the container 1 of this embodiment has excellent aesthetic appeal.

[0065] Furthermore, because the total number of parts is small, the container 1 of this embodiment is easy to assemble and offers excellent productivity.

[0066] The above explanation is provided to facilitate understanding of the present invention and does not limit it. The present invention may be modified or improved without departing from its spirit, and equivalents thereof are included.

[0067] For example, in the above, the angles at which the lid 3 stops with respect to the container body 2 by the stop mechanism were set to approximately 135° and 180°. However, by increasing or decreasing the number of faces of the first polygonal surface 235R and the second polygonal surface 325L, the lid 3 may be made to stop at, for example, one or three or more angles.

[0068] Furthermore, for example, in the above example, two stop mechanisms (a first stop mechanism and a second stop mechanism) are provided symmetrically on the left and right sides for the purpose of ensuring operational stability, but there may be one stop mechanism or three or more. Also, if the container 1 has multiple configurations that function as bearings (for example, configurations having pins, through holes, and bearing holes), stop mechanisms may be provided only on some of the above-mentioned configurations.

[0069] Furthermore, the present invention can be broadly applied to lidded containers other than compact containers. For example, the names "container body" and "lid" used above are merely conveniently assigned as examples of a first member, which is one component connected via a hinge mechanism, and a second member, which is the other component. Therefore, for example, the configuration of the container body 2 may be considered to be provided by the lid 3, and the configuration of the lid 3 may be considered to be provided by the container body 2. Also, when "container body" and "lid" are broadly considered as the first member and the second member, respectively, the functions of the first member and the second member are not necessarily limited.

[0070] Furthermore, the present invention is not limited to containers with lids, but can be broadly applied to various objects (articles, products, goods, etc.) having a structure in which two members are connected via a hinge mechanism so as to be openable and closable. [Explanation of symbols]

[0071] 1 Container, 2 Container body, 23R First body side protrusion, 231R First through hole, 233R First front side rib, 2331R First plane, 234R First rear side rib, 23L Second body side protrusion, 231L Second through hole, 233L Second front side rib, 2331L Second plane, 234L Second rear side rib, 24 Body side recess, 3 Lid, 320R First end face, 322R First bearing hole, 320L Second end face, 322L Second bearing hole, 323R First annular protrusion, 323L Second annular protrusion, 324R First curved surface, 325R (325Ra, 325Rb), First polygonal surface, 324L Second curved surface, 325L (325La, 325Lb) Second polygonal surface, 34R First notch, 34L Second notch, 32 Lid-side protrusion, 4R First pin, 41R First engaging projection, 42R First cutout, 4L Second pin, 41L Second engaging projection, 42L Second cutout

Claims

1. A hinge mechanism connecting a first member and a second member, A first member side protrusion formed on the first member side end edge, which is an end edge of the first member, A second member side protrusion formed on the second member side end edge, which is an end edge of the second member, Equipped with, The protrusion on the first member side has a through hole in the surface that faces the protrusion on the second member side and intersects with the axis of the hinge mechanism. The protrusion on the second member side has a bearing hole on the surface facing the protrusion on the first member side and intersecting with the axis of the hinge mechanism. A pin that penetrates the protrusion on the first member and whose tip is inserted into the protrusion on the second member, An annular projection is formed on the surface of the second member side projection facing the first member side projection, along the periphery of the bearing hole, A rib is formed on the surface of the protrusion on the first member side facing the protrusion on the second member side, and has a flat surface on the side facing the annular protrusion, It has, The outer surface of the annular protrusion has a curved surface and one or more polygonal surfaces. The polygonal surface is formed so as to be in surface contact with the plane of the rib when the second member is open to the first member at a predetermined angle. Hinge mechanism.

2. The aforementioned pin has a cotter pin structure. The hinge mechanism according to claim 1.

3. The first member, the second member, and the pin are made of a common resin material. The hinge mechanism according to claim 2.

4. The first member is a container body having an opening, The second member is a lid connected to the container body via a hinge mechanism. A hinge mechanism according to any one of claims 1 to 3.

5. A hinge mechanism connecting a first member and a second member, A first member side protrusion formed at one end of the first member side end, which is an end edge of the first member, The second protrusion on the first member side, formed at the other end of the first member side edge, A second member-side protrusion is formed on the second member-side end edge, which is an end edge of the second member, and has a shape that fits into the first member-side recess formed between the first member-side first protrusion and the first member-side second protrusion, The first protrusion on the first member side has a first through hole on the surface facing the protrusion on the second member side. The second member side projection has a first bearing hole on the side facing the first member side projection, The second protrusion on the first member side has a second through hole on the side facing the protrusion on the second member side. The second member side projection has a second bearing hole on the side facing the second projection on the first member side. A first pin that penetrates the first protrusion on the first member side and whose tip is inserted into the protrusion on the second member side, A second pin that penetrates the second protrusion on the first member and whose tip is inserted into the protrusion on the second member, A first annular projection is formed on the surface of the second member side projection facing the first member side projection, along the circumference of the first bearing hole, A second annular projection is formed on the surface of the second member-side projection facing the second member-side projection, along the periphery of the second bearing hole, A first rib is formed on the surface of the first protrusion on the first member side facing the protrusion on the second member side, and has a first plane on the side facing the first annular protrusion, A second rib is formed on the surface of the second protrusion on the first member side that faces the second member side protrusion, and has a second plane on the side facing the second annular protrusion, It has, The outer circumferential surface of the first annular protrusion has a first curved surface and one or more first polygonal surfaces. The outer circumferential surface of the second annular protrusion has a second curved surface and one or more second polygonal surfaces. The first polygonal surface is formed to be in surface contact with the first plane of the first rib when the second member is open to the first member at a predetermined angle. The second polygonal surface is formed to be in surface contact with the second plane of the second rib when the second member is open to the first member at a predetermined angle. Hinge mechanism.

6. The first pin and the second pin have a cotter pin structure. The hinge mechanism according to claim 5.

7. The first member, the second member, the first pin, and the second pin are made of a common resin material. The hinge mechanism according to claim 6.

8. The first member is a container body having an opening, The second member is a lid connected to the container body via a hinge mechanism. A hinge mechanism according to any one of claims 5 to 7.

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