Opening / closing device

Abstract

To provide an opening / closing device that can suppress occurrence of shortage of lubricant.SOLUTION: In an opening / closing device 100, with opening / closing motion, part of one of a base part and a rotary part reciprocates along a first direction relative to a surface of the other of the base part and rotary part while coming into contact with the surface. A first groove part 43 for storing a lubricant is formed in the part or the surface. The first groove part 43 includes a first groove 44 disposed on one side in the first direction and a second groove 45 disposed on the other side in the first direction across a first center line C1 along a second direction that passes through a center of the first direction and is orthogonal to the first direction in a contact region between the part and the surface. The first groove 44 and the second groove 45 have a shape extending in a direction separating from the center of the second direction as proceeding to the center of the first direction in the contact region.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a technique for an opening and closing device that performs opening and closing operations by rotating a rotating part relative to a base part. [Background technology]

[0002] An original cover closer is known that includes a mounting member, a support member rotatably mounted to the mounting member via a hinge shaft, a pressure-receiving member provided on the mounting member, a cam slider slidably provided inside the support member with a cam portion abutting against the pressure-receiving member, and an elastic means that presses the cam slider against the pressure-receiving member and urges the support member to rotate in the opening direction (see Patent Document 1). In the original cover closer, grease for lubrication is applied to the sliding surface between the cam portion of the cam slider and the pressure-receiving member. A plurality of grease reservoirs are provided on the sliding surface on the cam portion of the cam slider.

[0003] Also, a hinge is known that includes a lower fixed member, a cam member supported by the lower fixed member, a second wing member rotatably connected to the lower fixed member via a first pivot pin, a first slider supported by the second wing member and movable in a direction toward the cam member and a direction away from the cam member, and a spring that biases the first slider in a direction toward the cam member to bring the first slider into contact with the cam member (see Patent Document 2). In the hinge, the first slider has a cam contact surface, the cam member has an contact surface, and the cam contact surface contacts the contact surface. The first slider has a groove formed on the cam contact surface for storing grease. In the hinge, a lubricant such as grease is applied to the contact portion between the cam contact surface and the contact surface, and the lubricant is stored in a plurality of grooves formed on the cam contact surface. The groove is configured in a straight line inclined with respect to the axial direction of the first pivot pin when viewed from the contact surface. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3231804 [Patent Document 2] JP 2021-175130 A Summary of the Invention [Problem to be solved by the invention]

[0005] Here, in the hinge, when the second wing member rotates in the opening and closing directions relative to the lower fixed member, the first slider is pressed by the spring, so that the cam abutment surface moves back and forth along a direction perpendicular to the axial direction of the first pivot pin while contacting the abutment surface. When the second wing member repeatedly rotates relative to the lower fixed member, the lubricant is divided into two types: one that moves along the groove and remains in the groove, and one that is scraped out of the groove and remains in the contact portion between the cam abutment surface and the abutment surface. Some of the lubricant scraped out of the groove moves to the outside in the axial direction of the first pivot pin and moves to the adjacent groove, and is even pushed out to the outside of the contact portion between the cam abutment surface and the abutment surface. As a result of the lubricant being pushed out to the outside of the contact portion between the cam abutment surface and the abutment surface, there was a problem that a shortage of lubricant occurred in the contact portion between the cam abutment surface and the abutment surface.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a switching device that can suppress the occurrence of a shortage of lubricant. [Means for solving the problem]

[0007] The problem to be solved by the present invention has been described above, and the means for solving this problem will now be described.

[0008] That is, in the opening and closing device disclosed in the present application, a base portion and a rotating portion are rotatably arranged, and the opening and closing operation is performed by the rotating portion rotating relative to the base portion, and one of the base portion or the rotating portion moves back and forth along a first direction relative to the surface while a portion of the base portion or the rotating portion contacts the other surface of the base portion or the rotating portion in association with the opening and closing operation, and a first groove portion in which lubricant accumulates is formed in the portion or the surface, and the first groove portion has, in a contact area between the portion and the surface, a first groove arranged on one side of the first direction and a second groove arranged on the other side of the first direction, with a first center line along a second direction perpendicular to the first direction that passes through the center of the first direction as a boundary, and the first groove and the second groove have a shape that extends in a direction away from the center of the second direction as it approaches the center of the first direction in the contact area. Effect of the Invention

[0009] The present invention has the following advantages. That is, according to the present invention, it is possible to suppress the occurrence of a shortage of lubricant. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a perspective view showing a fully open state of the opening and closing device according to the embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] Cross-sectional view taken along line AA in FIG. 2. [Figure 4] FIG. [Diagram 5] Cross-sectional view of line BB in Figure 4. [Figure 6] FIG. [Figure 7] Cross-sectional view taken along line CC in FIG. [Figure 8] FIG. 4 is a perspective view showing a first slider of the opening and closing device. [Figure 9]FIG. 4 is a rear view showing the first slider of the opening and closing device in a closed state. [Figure 10] FIG. 4 is a perspective view showing a first slider of the opening and closing device. [Figure 11] FIG. 4 is a rear view showing the first slider of the opening and closing device in a closed state. [Figure 12] FIG. 4 is a perspective view showing a second slider of the opening and closing device. [Figure 13] FIG. 4 is a front view showing the second slider of the opening and closing device in a closed state. [Figure 14] FIG. 4 is a front view showing the second slider of the opening and closing device in a closed state. [Figure 15] FIG. 4 is a front view showing the second slider of the opening and closing device in a closed state. [Figure 16] FIG. [Figure 17] FIG. [Figure 18] Cross-sectional view taken along line DD in FIG. 17. [Figure 19] FIG. [Figure 20] 19 is a cross-sectional view taken along line EE in FIG. [Figure 21] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] An opening and closing device 100 shown in Figs. 1 to 15 will be described. The opening / closing device 100 is a hinge that connects one of two members to the other member so that the other member can be opened and closed, and a base part and a rotating part are rotatably provided, and the rotating part rotates relative to the base part to perform opening and closing operations. The opening / closing device 100 is used in, for example, office automation equipment such as scanners, faxes, and copy machines or multifunction machines, automobiles, toilet seats, and various electronic devices such as rice cookers. Examples of the opening / closing device 100 that connects one of two members to the other member so that the other member can be opened and closed include a door part that is rotatably connected to the main body of a printer, a manuscript pressing device that is rotatably connected to the main body of a multifunction machine, a display that is rotatably connected to a stand, a toilet seat that is rotatably connected to a toilet seat, and a bonnet that is rotatably connected to the body of an automobile.

[0012] The rotation angle θ of the rotating part is defined as 0° when the rotating part is closed relative to the base part, and the rotation angle θ of the rotating part is increased when the rotating part rotates in the opening direction. For convenience, the opening and closing device 100 will be described below based on the up-down direction, the front-rear direction, and the left-right direction of the opening and closing device 100 when the rotating part is closed relative to the base part.

[0013] As shown in FIG. 1 to FIG. 7, the opening and closing device 100 includes a lower fixed member 10, an intermediate member 20, an upper fixed member 30, a slider unit having a first slider 40 and a second slider 50, a spring member 60, a damper 62, a first rotating shaft 71, a second rotating shaft 72, a first abutment portion 75, and a second abutment portion 76. The first direction according to the present invention is perpendicular to the second direction. The second direction according to the present invention is parallel to the axial direction of the first rotating shaft 71 and parallel to the left-right direction of the opening and closing device 100. The third direction according to the present invention is perpendicular to the fourth direction. The fourth direction according to the present invention is parallel to the axial direction of the second rotating shaft 72 and parallel to the left-right direction of the opening and closing device 100. One embodiment of the base according to the present invention includes the lower fixed member 10, the first rotating shaft 71, and the first abutment portion 75. One embodiment of the rotating portion according to the present invention includes an intermediate member 20, an upper fixed member 30, a slider portion (first slider 40 and second slider 50), a spring member 60, a damper 62, a second rotating shaft 72, and a second abutment portion .

[0014] The lower fixing member 10 is formed by appropriately bending a single metal plate. The lower fixing member 10 includes a bottom plate 11, left and right side plates 12, 12, and a back plate 13.

[0015] The bottom plate 11 of the lower fixing member 10 is a plate-like member forming the lower part of the lower fixing member 10. The shape of the bottom plate 11 is a roughly rectangular shape that is slightly longer in the front-rear direction in a plan view. The side plates 12 of the lower fixing member 10 are plate-like members forming the left and right sides of the lower fixing member 10. The lower ends of the side plates 12 are connected to the ends of the bottom plate 11. A through hole is opened in the upper rear ends of the side plates 12 and 12 for inserting the first rotating shaft 71. A through hole is opened in the upper front ends of the side plates 12 and 12 for inserting the first abutment portion 75. The back plate 13 of the lower fixing member 10 is a plate-like member forming the rear part of the lower fixing member 10. The shape of the back plate 13 is a roughly rectangular shape that is slightly longer in the left-right direction in a front view. The lower end of the back plate 13 is connected to the rear end of the bottom plate 11.

[0016] The intermediate member 20 is one embodiment of the first rotating part according to the present invention. The intermediate member 20 is formed by appropriately bending one metal plate. The intermediate member 20 includes a top plate 21 and left and right side plates 22 and 22. The top plate 21 is disposed above the side plates 22 and 22, and the side plates 22 and 22 are bent downward from both the left and right sides of the top plate 21, so that the intermediate member 20 is configured to be substantially U-shaped when viewed from the front in the closed state of the opening and closing device 100. The lower ends of the side plates 22 and 22 are bent so as to extend toward the left and right center, respectively, so that the intermediate member 20 is configured to be box-shaped with openings at the left and right center portions on the lower side. The intermediate member 20 is rotatably supported by the lower fixed member 10 via a first rotating shaft 71 in a state in which the first slider 40, the second slider 50, the spring member 60, the damper 62, etc. are housed therein. A through hole for inserting the first rotating shaft 71 is opened at the rear of the side plates 22 and 22. The side plates 22 have front ends each formed with a through hole into which the second rotating shaft 72 is inserted.

[0017] The first rotating shaft 71 is a generally cylindrical member. The first rotating shaft 71 is inserted into a through hole in the rear part of the side plates 22 of the intermediate member 20 and a through hole in the upper rear end part of the side plates 12 of the lower fixed member 10. The intermediate member 20 is rotatably connected to the lower fixed member 10 via the first rotating shaft 71.

[0018] The upper fixing member 30 is one embodiment of the second rotating part according to the present invention. The upper fixing member 30 is formed by appropriately bending one metal plate. The upper fixing member 30 includes a top plate 31 and left and right side plates 32 and 32. The upper fixing member 30 is configured to be substantially U-shaped when viewed from the front in the closed state of the opening / closing device 100, with the top plate 31 disposed above the side plates 32 and 32 and the side plates 32 and 32 bent downward from both the left and right sides of the top plate 31. The upper fixing member 30 is rotatably supported by the intermediate member 20 via the second rotating shaft 72. The upper fixing member 30 is fixed to the other of the two members. A through hole for inserting the second rotating shaft 72 is opened at the front upper end of the side plates 32 and 32. A through hole for attaching the second abutment portion 76 is opened at the front lower end of the side plates 32 and 32.

[0019] The second rotating shaft 72 is a generally cylindrical member. The second rotating shaft 72 is inserted into a through hole in the front upper end portion of the side plates 32 of the upper fixing member 30 and a through hole in the front portion of the side plates 12 of the intermediate member 20. The upper fixing member 30 is rotatably connected to the intermediate member 20 via the second rotating shaft 72.

[0020] The second abutment portion 76 is one embodiment of the second pressure receiving portion according to the present invention. The second abutment portion 76 is configured in a pin shape. The second abutment portion 76 is inserted into a through hole in the front lower end portion of the side plates 32 and fixed to the upper fixing member 30. The surface of the second abutment portion 76 on the second slider 50 side comes into contact with the second cam portion 52 of the second slider 50. Note that the second abutment portion 76 is not limited to being pin-shaped, and may be configured in other ways, such as being configured in a block shape or by bending a plate-shaped member.

[0021] The first slider 40 is made of a resin material. The first slider 40 is open at the front and has a bottom at the rear. The first slider 40 has a first cam portion 42 formed of a curved surface on the rear surface of the bottom. The first cam portion 42 is one embodiment of the first surface according to the present invention. The first slider 40 is configured to contact the first abutment portion 75 at the rear surface of the first cam portion 42. A spring receiving hole that accommodates the rear end portion of the spring member 60 is formed in the first slider 40. The first slider 40 is accommodated in the rear portion inside the intermediate member 20 so as to be slidable in the front-rear direction. A lubricant such as grease is applied to the contact portion between the first cam portion 42 and the first abutment portion 75 to suppress wear.

[0022] The second slider 50 is made of a resin material. The second slider 50 is open at the rear and has a bottom at the front. The second slider 50 has a second cam portion 52 on the front surface of the bottom. The second cam portion 52 is one embodiment of the second surface according to the present invention. The second slider 50 is configured to contact the second abutment portion 76 at the second cam portion 52. A spring receiving hole that accommodates the front end portion of the spring member 60 is formed in the second slider 50. The second slider 50 is accommodated in the rear portion inside the intermediate member 20 so as to be slidable in the front-rear direction. A lubricant is applied to the contact portion between the second cam portion 52 and the second abutment portion 76 to suppress wear.

[0023] The rotating part transitions between a fully open state and a closed state with respect to the base part. The state in which the rotating part is closest to the base part is the "closed state" of the rotating part. The closed state refers to a state in which the rotation angle θ of the rotating part from the closed state with respect to the base part is 0° (see FIG. 4 or FIG. 5). The state in which the rotating part is farthest from the base part is the "fully open state" of the rotating part. The fully open state refers to a state in which the rotation angle θ is 60° (see FIG. 2 or FIG. 3). The state of the rotating part between the closed state and the fully open state is the "open state" of the rotating part. The open state refers to a state in which the rotation angle θ satisfies the relationship 0°<θ<60°. Note that the closed state of the rotating part is not limited to a rotation angle θ of 0°, and the fully open state of the rotating part is not limited to a rotation angle θ of 60°, and the rotation angle θ of the closed state of the rotating part or the rotation angle θ of the fully open state of the rotating part can be appropriately set to other angles depending on the specifications, applications, etc.

[0024] As shown in FIG. 6 or FIG. 7, a lift state can be established in which the intermediate member 20 is open relative to the lower fixed member 10 and the upper fixed member 30 is open relative to the intermediate member 20.

[0025] The spring member 60 is made of a metal coil spring. The spring member 60 is housed in the spring receiving holes of the first slider 40 and the second slider 50 inside the intermediate member 20. The rear end of the spring member 60 is inserted into the spring receiving hole formed in the first slider 40 and contacts the bottom surface of the spring receiving hole. The front end of the spring member 60 is inserted into the spring receiving hole formed in the second slider 50 and contacts the bottom surface of the spring receiving hole.

[0026] Due to the elastic force of the spring member 60, the first slider 40 is pressed in the direction approaching the first abutment portion 75 in the longitudinal direction of the intermediate member 20, and the second slider 50 is pressed in the direction approaching the second abutment portion 76 in the longitudinal direction of the intermediate member 20.

[0027] The damper 62 is housed in spring receiving holes of the first slider 40 and the second slider 50. The main body of the damper 62 is fixed to the bottom of the second slider 50, and its tip protrudes toward the first rotating shaft 71. The damper 62 generates a reaction force when the tip is pressed by the bottom of the first slider 40. Therefore, the reaction force reduces the speed at which the first slider 40 moves, and a buffering effect is generated by the damper 62. The damper 62 is configured as a general fluid damper.

[0028] The first contact portion 75 is one embodiment of the first pressure receiving portion according to the present invention. The first contact portion 75 is made of a resin material and configured in a pin shape. The first contact portion 75 is inserted into a through hole in the front upper end portion of the side plates 12 and fixed to the lower fixed member 10 forward of the first rotating shaft 71. The surface of the first contact portion 75 on the first slider 40 side is configured as a curved surface and contacts the first cam portion 42 of the first slider 40. Note that the first contact portion 75 is not limited to being pin-shaped, and may be configured in other ways, such as being configured in a block shape or by bending a plate-shaped member.

[0029] When the first contact portion 75 is attached to the lower fixed member 10 and the intermediate member 20 is in the closed state, the first cam portion 42 of the first slider 40 contacts the first contact portion 75, and the second cam portion 52 of the second slider 50 contacts the second contact portion 76. In this state, the first slider 40 is pressed by the elastic force generated in the spring member 60, and the intermediate member 20 is pressed so as to rotate in the opening direction relative to the lower fixed member 10. In addition, the second slider 50 is pressed by the elastic force generated in the spring member 60, and the upper fixed member 30 is pressed so as to rotate in the closing direction relative to the intermediate member 20. At this time, the tip portion of the damper 62 is pressed by the bottom portion of the second slider 50 and is pushed toward the main body portion of the damper 62. Furthermore, even when the rotating parts are in the open state, the first cam portion 42 of the first slider 40 contacts the first abutment portion 75, and the second cam portion 52 of the second slider 50 contacts the second abutment portion 76. In this state, the first slider 40 is pressed by the elastic force generated in the spring member 60, and the intermediate member 20 is pressed so as to rotate in the opening direction relative to the lower fixed member 10. Furthermore, the second slider 50 is pressed by the elastic force generated in the spring member 60, and the upper fixed member 30 is pressed so as to rotate in the closing direction relative to the intermediate member 20. Furthermore, even when the rotating parts are in the fully open state, the first cam portion 42 of the first slider 40 contacts the first abutment portion 75, and the second cam portion 52 of the second slider 50 contacts the second abutment portion 76. In this state, the first slider 40 is pressed by the elastic force generated in the spring member 60, and the intermediate member 20 is pressed so as to rotate in the opening direction relative to the lower fixed member 10. Furthermore, the second slider 50 is pressed by the elastic force generated in the spring member 60, and the upper fixed member 30 is pressed so as to rotate in the closing direction relative to the intermediate member 20. That is, the first slider 40 is pressed toward the first abutment portion 75 so that the first cam portion 42 continues to be in contact with the first abutment portion 75 from the closed state to the fully open state of the rotating portion, regardless of the rotation angle θ of the rotating portion. When the rotating portion is changed from the closed state to the fully open state, the first cam portion 42 of the first slider 40 contacts the first abutment portion 75, and the second cam portion 52 of the second slider 50 contacts the second abutment portion 76. Due to the elastic force generated in the spring member 60, the intermediate member 20 is pressed to rotate in an opening direction relative to the lower fixed member 10, and the upper fixed member 30 is pressed to rotate in a closing direction relative to the intermediate member 20.

[0030] As the intermediate member 20 rotates in the opening and closing directions relative to the lower fixed member 10, the first slider 40 is pressed by the spring member 60, causing a part of the first cam portion 42 to contact the surface of the first abutment portion 75 and move back and forth relative to the surface of the first abutment portion 75 along a direction (first direction) perpendicular to the axial direction of the first pivot shaft 71.

[0031] 8 and 9 are diagrams showing the first slider 40 when the opening / closing device 100 is in the state of FIG. 4. In this state, the up-down direction corresponds to the "first direction" of the present invention, and the left-right direction corresponds to the "second direction" of the present invention. As shown in FIG. 8 or 9, the first cam portion 42 has a plurality of first groove portions 43 in a contact area with the first abutment portion 75 on the surface. The first groove portions 43 are configured to accumulate lubricant. The first groove portions 43 are configured to extend from the axial outside to the axial inside of the first rotating shaft 71. The first groove portions 43 guide the lubricant accumulated in the first groove portions 43 to flow out to the axial inside of the first rotating shaft 71 when the intermediate member 20 repeatedly rotates relative to the lower fixed member 10. Because of this configuration, even if the intermediate member 20 repeatedly rotates relative to the lower fixed member 10, a relatively large amount of lubricant can be left in the contact portion between the first cam portion 42 and the first abutment portion 75. Therefore, it is possible to prevent a shortage of lubricant at the contact portion between the first cam portion 42 and the first contact portion 75.

[0032] The first groove portion 43 has a first groove 44 and a second groove 45. The first groove 44 is disposed on one side (upper side) in the vertical direction with respect to the first center line C1 in the contact area with the first abutment portion 75 of the surface of the first cam portion 42. The second groove 45 is disposed on the other side (lower side) in the vertical direction with respect to the first center line C1 in the contact area with the first abutment portion 75 of the surface of the first cam portion 42. Here, the first center line C1 indicates an imaginary line along the left-right direction passing through the center in the vertical direction in the contact area with the first abutment portion 75 of the surface of the first cam portion 42. The first groove 44 and the second groove 45 have a shape that extends in a direction away from the center in the horizontal direction as it approaches the center in the vertical direction in the contact area with the first abutment portion 75 of the surface of the first cam portion 42. Preferably, in FIG. 9, the first groove portion 43 is formed so that both ends thereof are located on a straight line along the vertical direction or are located close to the straight line. Because of this configuration, in either the fully open state or the closed state, the contact portion between the first groove portion 43 and the first abutment portion 75 is relatively closer to the left-right center than when the groove portion is linearly inclined with respect to the up-down direction as in the conventional case. Therefore, even if the intermediate member 20 repeatedly rotates relative to the lower fixed member 10, the lubricant moves along the first groove 44 and the second groove 45 in the contact area between the surface of the first cam portion 42 and the first abutment portion 75, and is likely to remain on the axial center side of the first rotating shaft 71. In this way, a relatively large amount of lubricant can be left in the contact portion between the first cam portion 42 and the first abutment portion 75. Therefore, it is possible to suppress the occurrence of a shortage of lubricant in the contact portion between the first cam portion 42 and the first abutment portion 75.

[0033] The first groove portion 43 is composed of five first groove portions 43a, 43b, 43c, 43d, and 43e. The first groove portions 43a, 43b, 43c, 43d, and 43e are arranged in the left-right direction. At least some of the first groove portions 43 are formed on one side and the other side of the left-right direction with respect to the second center line C2 in the contact area with the first abutment portion 75 of the surface of the first cam portion 42. Here, the second center line C2 indicates an imaginary line along the up-down direction that passes through the center in the left-right direction in the contact area with the first abutment portion 75 of the surface of the first cam portion 42. The first groove portions 43a, 43b and the first groove portions 43d, 43e are configured to be line-symmetrical with respect to the second center line C2 in the contact area with the first abutment portion 75 of the surface of the first cam portion 42. The first groove portion 43a is disposed on the leftmost side of the five first groove portions 43. The first groove portion 43a is formed in an arc shape in a rear view in the closed state of the opening / closing device 100 so that one end (upper end) and the other end (lower end) are located inward (rightward) in the axial direction of the first rotating shaft 71 from the middle portion. The first groove portion 43b is disposed to the right of the first groove portion 43a. The first groove portion 43b is configured in the same shape as the first groove portion 43a. The first groove portion 43b is formed in an arc shape in a rear view in the closed state of the opening / closing device 100 so that one end (upper end) and the other end (lower end) are located inward (rightward) in the axial direction of the first rotating shaft 71 from the middle portion. The first groove portion 43c is disposed in the center of the five first groove portions 43. The first groove portion 43c is configured in a straight line in the vertical direction in a rear view. The first groove portion 43d is disposed to the right of the first groove portion 43c. The first groove portion 43d is formed in an arc shape in rear view when the opening / closing device 100 is in the closed state so that one end (upper end) and the other end (lower end) are located further inward (leftward) in the axial direction of the first rotating shaft 71 than the midway portion. The first groove portion 43e is disposed at the rightmost of the five first groove portions 43. The first groove portion 43e is configured in a similar shape to the first groove portion 43d. The first groove portion 43e is formed in an arc shape in rear view when the opening / closing device 100 is in the closed state so that one end (upper end) and the other end (lower end) are located further inward (leftward) in the axial direction of the first rotating shaft 71 than the midway portion.

[0034] As described above, at least some of the first groove portions 43 (the first groove portions 43a, 43b, 43d, and 43e) are configured such that one end and the other end are located more inward in the axial direction of the first rotating shaft 71 than the intermediate portion. Therefore, the lubricant stored in the first groove portions 43 is guided to flow out toward the axial inner side of the first rotating shaft 71. Even if the intermediate member 20 repeatedly rotates relative to the lower fixed member 10, the lubricant moves along the first groove 44 and the second groove 45 in the contact area with the first abutment portion 75 on the surface of the first cam portion 42, and tends to remain on the axial center side of the first rotating shaft 71. For this reason, a relatively large amount of lubricant can be left in the contact portion between the first cam portion 42 and the first abutment portion 75. Therefore, it is possible to suppress the occurrence of a shortage of lubricant in the contact portion between the first cam portion 42 and the first abutment portion 75.

[0035] As described above, at least some of the multiple first groove portions 43 (first groove portions 43a, 43b, 43d, 43e) are configured in an arc shape, so that the lubricant stored in the first groove portions 43 is guided to flow out toward the axial inside of the first rotating shaft 71, and a relatively large amount of lubricant can be left in the contact portion between the first cam portion 42 and the first abutment portion 75 even if the intermediate member 20 repeatedly rotates relative to the lower fixed member 10. Therefore, it is possible to prevent a shortage of lubricant from occurring in the contact portion between the first cam portion 42 and the first abutment portion 75.

[0036] Furthermore, as described above, at least some of the multiple first groove portions 43 are formed on one side in the left-right direction and the other side in the left-right direction relative to the second center line C2, thereby preventing the lubricant from dispersing at the contact portion between the first cam portion 42 and the first abutment portion 75.

[0037] As described above, at least some of the multiple first groove portions 43 (first groove portions 43a and 43b and first groove portions 43d and 43e) are arranged to be line-symmetrical with respect to the second center line C2, which can suppress dispersion of the lubricant at the contact portion between the first cam portion 42 and the first abutment portion 75. The number of first groove portions 43 is not limited to five, and may be four or less or six or more. Also, the first groove portion 43 may be configured so that a portion thereof is cut off.

[0038] As shown in FIG. 10, at least some of the multiple first groove portions 43 (first groove portions 43a, 43b, 43d, 43e) may be formed in a substantially L-shape when viewed from behind when the opening and closing device 100 is in the closed state. As shown in FIG. 11, at least some of the multiple first groove portions 43 (first groove portions 43a, 43b, 43d, 43e) may be formed in a substantially W-shape when viewed from behind when the opening and closing device 100 is in the closed state. Moreover, the first groove portion 43 is not limited to such a shape, and may be formed into a substantially V-shape, a substantially U-shape, or the like in rear view when the opening / closing device 100 is in a closed state. Also, some or all of the multiple first groove portions 43 may be configured with different shapes, such as a configuration in which the multiple first groove portions 43 are configured with an arc-shaped portion and a substantially V-shaped portion. Moreover, instead of being provided in the first cam portion 42, the first groove portion 43 may be configured to be provided in a contact region with the first cam portion 42 on the surface of the first abutment portion 75.

[0039] As the upper fixing member 30 rotates in the opening and closing directions relative to the intermediate member 20, the second slider 50 is pressed by the spring member 60, causing a part of the second cam portion 52 to contact the surface of the second abutment portion 76 and move back and forth relative to the surface of the second abutment portion 76 in a direction perpendicular to the axial direction of the second pivot shaft 72 (third direction).

[0040] 12 and 13 are diagrams showing the second slider 50 when the opening / closing device 100 is in the state of FIG. 4. In this state, the up-down direction corresponds to the "third direction" of the present invention, and the left-right direction corresponds to the "fourth direction" of the present invention. As shown in FIG. 12 or 13, the second cam portion 52 has a plurality of second grooves 53 in a contact area with the second abutment portion 76 on the surface. The second grooves 53 are configured to accumulate lubricant. The second grooves 53 are configured to extend from the axial outside to the axial inside of the second rotating shaft 72. The second grooves 53 guide the lubricant accumulated in the second grooves 53 to flow out to the axial inside of the second rotating shaft 72 when the upper fixing member 30 repeatedly rotates relative to the intermediate member 20. Because of this configuration, a relatively large amount of lubricant can be left in the contact area between the second cam portion 52 and the second abutment portion 76 in either the fully open state or the closed state. Therefore, it is possible to prevent a shortage of lubricant from occurring at the contact portion between the second cam portion 52 and the second contact portion 76.

[0041] The second groove portion 53 has a third groove 54 and a fourth groove 55. The third groove 54 is disposed on one side (upper side) in the vertical direction with respect to the third center line C3 in the contact area with the second abutment portion 76 of the surface of the second cam portion 52. The fourth groove 55 is disposed on the other side (lower side) in the vertical direction with respect to the third center line C3 in the contact area with the second abutment portion 76 of the surface of the second cam portion 52. Here, the third center line C3 indicates an imaginary line along the left-right direction passing through the center in the vertical direction in the contact area with the second abutment portion 76 of the surface of the second cam portion 52. The third groove 54 and the fourth groove 55 have a shape that extends in a direction away from the center in the horizontal direction as it approaches the center in the vertical direction in the contact area with the second abutment portion 76 of the surface of the second cam portion 52. Preferably, in FIG. 13, the second groove portion 53 is formed so that both ends thereof are located on a straight line along the vertical direction or are located close to the straight line. Because of this configuration, in either the fully open state or the closed state, the portion where the second groove portion 53 and the second abutment portion 76 contact each other is relatively closer to the left-right center than when the groove portion is a straight line inclined with respect to the vertical direction as in the conventional case. For this reason, the lubricant is more likely to remain on the left-right center side. That is, even if the upper fixing member 30 rotates repeatedly with respect to the intermediate member 20, the lubricant moves along the third groove 54 and the fourth groove 55 in the contact area with the second abutment portion 76 on the surface of the second cam portion 52 and is more likely to remain on the axial center side of the second rotating shaft 72. In this way, a relatively large amount of lubricant can be left in the contact portion between the second cam portion 52 and the second abutment portion 76. Therefore, it is possible to suppress the occurrence of a shortage of lubricant in the contact portion between the second cam portion 52 and the second abutment portion 76.

[0042] The second groove portion 53 is composed of five second groove portions 53a, 53b, 53c, 53d, and 53e. The second groove portions 53a, 53b, 53c, 53d, and 53e are arranged along the left-right direction. At least some of the second groove portions 53 are formed on one side and the other side of the left-right direction with respect to the fourth center line C4 in the contact area with the second abutment portion 76 of the surface of the second cam portion 52. Here, the fourth center line C4 indicates a virtual line along the up-down direction that passes through the center in the left-right direction in the contact area with the second abutment portion 76 of the surface of the second cam portion 52. The second groove portions 53a, 53b and the second groove portions 53d, 53e are configured to be line-symmetrical with respect to the fourth center line C4 in the contact area with the second abutment portion 76 of the surface of the second cam portion 52. The second groove portion 53a is disposed on the leftmost side of the five second groove portions 53. The second groove portion 53a is formed in an arc shape in a front view when the opening / closing device 100 is in a closed state so that one end (upper end) and the other end (lower end) are located on the inner side (left side) of the second rotating shaft 72 in the axial direction from the middle portion. The second groove portion 53b is disposed to the right of the second groove portion 53a. The second groove portion 53b is configured in a similar shape to the second groove portion 53a. The second groove portion 53b is formed in an arc shape in a front view when the opening / closing device 100 is in a closed state so that one end (upper end) and the other end (lower end) are located on the inner side (left side) of the second rotating shaft 72 in the axial direction from the middle portion. The second groove portion 53c is disposed in the center of the five second groove portions 53. The second groove portion 53c is configured in a straight line in the vertical direction in a front view. The second groove portion 53d is disposed to the right of the second groove portion 53c. The second groove portion 53d is formed in an arc shape in a front view when the opening / closing device 100 is in the closed state so that one end (upper end) and the other end (lower end) are located further inward (rightward) in the axial direction of the second rotating shaft 72 than the midway portion. The second groove portion 53e is disposed at the rightmost of the five second groove portions 53. The second groove portion 53e is configured in a similar shape to the second groove portion 53d. The second groove portion 53e is formed in an arc shape in a front view when the opening / closing device 100 is in the closed state so that one end (upper end) and the other end (lower end) are located further inward (rightward) in the axial direction of the second rotating shaft 72 than the midway portion.

[0043] As described above, at least some of the second groove portions 53 (the second groove portions 53a, 53b, 53d, and 53e) are configured such that one end and the other end are located axially inward of the second pivot shaft 72 relative to the intermediate portion. Therefore, the lubricant stored in the second groove portions 53 is guided to flow out axially inward of the second pivot shaft 72. Even if the upper fixing member 30 repeatedly rotates relative to the intermediate member 20, the lubricant moves along the third groove 54 and the fourth groove 55 in the contact region with the second abutment portion 76 on the surface of the second cam portion 52 and tends to remain on the axial center side of the second pivot shaft 72. For this reason, a relatively large amount of lubricant can be left in the contact portion between the second cam portion 52 and the second abutment portion 76. Therefore, it is possible to suppress the occurrence of a shortage of lubricant in the contact portion between the second cam portion 52 and the second abutment portion 76.

[0044] As described above, at least some of the multiple second groove portions 53 (second groove portions 53a, 53b, 53d, 53e) are configured in an arc shape, so that the lubricant stored in the second groove portions 53 is guided to flow out toward the inside in the axial direction of the second rotating shaft 72, and a relatively large amount of lubricant can be left in the contact portion between the second cam portion 52 and the second abutment portion 76 even if the upper fixed member 30 repeatedly rotates relative to the intermediate member 20. Therefore, it is possible to prevent a shortage of lubricant from occurring in the contact portion between the second cam portion 52 and the second abutment portion 76.

[0045] Furthermore, as described above, at least some of the multiple second groove portions 53 are formed on one side in the left-right direction and the other side in the left-right direction relative to the fourth center line C4, so that dispersion of the lubricant at the contact portion between the first cam portion 42 and the first abutment portion 75 can be suppressed.

[0046] As described above, at least some of the multiple second groove portions 53 (second groove portions 53a-53b and second groove portions 53d-53e) are configured to be symmetrical with respect to the fourth center line C4, which can prevent the lubricant from dispersing in the contact portion between the second cam portion 52 and the second abutment portion 76. The number of second groove portions 53 is not limited to five, and may be four or less or six or more. Also, the second groove portion 53 may be configured so that a portion thereof is cut off.

[0047] As shown in FIG. 14, at least some of the multiple second groove portions 53 (second groove portions 53a, 53b, 53d, and 53e) may be formed into a substantially L-shape when viewed from behind when the opening and closing device 100 is in the closed state. As shown in FIG. 15, at least some of the multiple second groove portions 53 (second groove portions 53a, 53b, 53d, and 53e) may be formed in an approximately W-shape when viewed from behind when the opening and closing device 100 is in the closed state. Further, the second groove portion 53 is not limited to such a shape, and may be formed into a substantially V-shape, a substantially U-shape, or the like in rear view when the opening / closing device 100 is in a closed state. Further, some or all of the multiple second groove portions 53 may be configured with different shapes, such as a configuration in which the multiple second groove portions 53 are configured with an arc-shaped portion and a substantially V-shaped portion. Further, instead of being provided in the second cam portion 52, the second groove portion 53 may be configured to be provided in a contact area between the surface of the second abutment portion 76 and the second cam portion 52.

[0048] Next, the opening and closing device 110 shown in Figures 16 to 21 will be described. In the description of the opening and closing device 110 shown in Figures 16 to 21, the description of the same parts as those of the opening and closing device 100 shown in Figures 1 to 15 will be omitted as appropriate, and the description will focus on the parts that differ from the opening and closing device 100 shown in Figures 1 to 15.

[0049] 16 to 20, the opening and closing device 110 includes a lower fixed member 10, an upper fixed member 30, a spring member 60, a rotating shaft 73, and a slider 80. The second direction according to the present invention is parallel to the axial direction of the rotating shaft 73 and parallel to the left-right direction of the opening and closing device 110. One embodiment of the base portion according to the present invention includes the lower fixed member 10 and the rotating shaft 73. One embodiment of the rotating portion according to the present invention includes the upper fixed member 30, the slider 80, and the spring member 60.

[0050] The lower fixing member 10 is a generally cylindrical member with a vertical direction as a longitudinal direction, an opening at the top, and a bottom at the bottom. A slider 80 is housed in the space inside the lower fixing member 10.

[0051] The lower fixing member 10 has left and right support parts 14, 14. The support parts 14 protrude upward from the left and right parts, respectively, at the upper rear part of the lower fixing member 10. The support parts 14 rotatably support the upper fixing member 30 via a rotating shaft 73. A through hole for inserting the rotating shaft 73 is opened in the support parts 14.

[0052] The closed state of the opening / closing device 110 refers to a state in which the rotation angle θ of the rotating part relative to the base part from the closed state is 0° (see FIG. 19 or FIG. 20). The fully open state of the opening / closing device 110 refers to a state in which the rotation angle θ is 70° (see FIG. 17 or FIG. 18). The state of the rotating part between the closed state and the fully open state is referred to as the "open state" of the rotating part. The open state refers to a state in which the rotation angle θ satisfies the relationship 0°<θ<70°. Note that the closed state of the rotating part is not limited to a rotation angle θ of 0°, and the fully open state of the rotating part is not limited to a rotation angle θ of 70°, and the rotation angle θ of the rotating part in the closed state or the rotation angle θ of the rotating part in the fully open state can be appropriately set to other angles depending on the specifications, applications, etc.

[0053] The upper fixed member 30 is rotatably connected to the lower fixed member 10 via a rotating shaft 73. A through hole for inserting the rotating shaft 73 is opened at the rear of the upper fixed member 30. The upper fixed member 30 has a contact portion 33. The contact portion 33 is one embodiment of a first pressure-receiving portion according to the present invention. The contact portion 33 protrudes downward at the lower part of the upper fixed member 30, and its lower end portion is configured as a curved cam surface. The surface of the contact portion 33 facing the slider 80 comes into contact with the cam portion 82 of the slider 80.

[0054] The rotating shaft 73 is inserted into the through hole of the support portion 14 of the lower fixed member 10 and the through hole of the upper fixed member 30. It is a member forming a rotating shaft that rotatably connects the upper fixed member 30 to the lower fixed member 10. The rotating shaft 73 is a roughly cylindrical member, and is inserted into the front parts of the upper fixed member 30 and the lower fixed member 10. As a result, the upper fixed member 30 is rotatably connected to the lower fixed member 10 via the rotating shaft 73.

[0055] The slider 80 is one embodiment of the slider part according to the present invention. The slider 80 is made of a resin material. The slider 80 is configured to have a cylindrical shape with an opening at the bottom and a bottom at the top. The slider 80 has a cam part 82 protruding upward from the top surface of the bottom. The cam part 82 is one embodiment of the first surface according to the present invention. The slider 80 is configured so that the top surface of the cam part 82 comes into contact with the abutment part 33 of the upper fixed member 30. A spring receiving hole that accommodates the upper end part of the spring member 60 is formed on the bottom lower surface of the slider 80. The slider 80 is accommodated in the lower fixed member 10 and configured to be slidable in a direction approaching and moving away from the abutment part 33 of the upper fixed member 30. A lubricant is applied to the contact part between the cam part 82 and the abutment part 33 to suppress wear.

[0056] The spring member 60 is housed inside the slider 80. The upper end of the spring member 60 is inserted into a spring receiving hole formed in the slider 80 and contacts the bottom surface of the spring receiving hole. The lower end of the spring member 60 contacts the upper surface of the bottom of the lower fixed member 10. The elastic force generated by the spring member 60 presses the slider 80 in a direction approaching the abutment portion 33 of the upper fixed member 30 (upward). By pressing the slider 80, the spring member 60 brings the cam portion 82 into contact with the abutment portion 33, and presses the upper fixed member 30 in a direction opening relative to the lower fixed member 10.

[0057] As the upper fixing member 30 rotates in the opening and closing directions relative to the lower fixing member 10, the slider 80 is pressed by the spring member 60, causing a part of the cam portion 82 to contact the surface of the abutment portion 33 and move back and forth relative to the surface of the abutment portion 33 in a direction perpendicular to the axial direction of the pivot shaft 73 (up and down direction).

[0058] In this embodiment, the front-rear direction corresponds to the "first direction" of the present invention, and the left-right direction corresponds to the "second direction" of the present invention. As shown in FIG. 21, the cam portion 82 has a plurality of grooves 83 in the contact area with the abutment portion 33 on the surface. The grooves 83 are one embodiment of the first groove portion according to the present invention. The grooves 83 are configured to store lubricant. The grooves 83 are configured to extend from the axially outer side to the axially inner side of the rotating shaft 73. The grooves 83 guide the lubricant stored in the grooves 83 to flow out to the axially inner side of the rotating shaft 73 when the upper fixing member 30 repeatedly rotates relative to the lower fixing member 10. Because of this configuration, even if the upper fixing member 30 repeatedly rotates relative to the lower fixing member 10, a relatively large amount of lubricant can be left in the contact portion between the cam portion 82 and the abutment portion 33. Therefore, it is possible to suppress the occurrence of a shortage of lubricant in the contact portion between the cam portion 82 and the abutment portion 33.

[0059] The groove portion 83 has a first groove 84 and a second groove 85. The first groove 84 is disposed on one side (front side) in the front-rear direction with the first center line C1 as a boundary in the contact area with the abutment portion 33 of the surface of the cam portion 82. The second groove 85 is disposed on the other side (rear side) in the front-rear direction with the first center line C1 as a boundary in the contact area with the abutment portion 33 of the surface of the cam portion 82. Here, the first center line C1 indicates an imaginary line along the left-right direction passing through the center in the front-rear direction in the contact area with the abutment portion 33 of the surface of the cam portion 82. The first groove 84 and the second groove 85 have a shape that extends in a direction away from the center in the left-right direction as it approaches the center in the front-rear direction in the contact area with the abutment portion 33 of the surface of the cam portion 82. Preferably, in FIG. 21, the groove portion 83 is formed so that both ends thereof are located on a straight line along the front-rear direction or are located close to the straight line. Because of this configuration, in either the fully open state or the closed state, the contact portion between the groove portion 83 and the abutment portion 33 is relatively closer to the left-right center than when the groove portion is linearly inclined with respect to the up-down direction as in the conventional case. Therefore, even if the upper fixing member 30 repeatedly rotates relative to the lower fixing member 10, the lubricant moves along the first groove 84 and the second groove 85 in the contact area between the surface of the cam portion 82 and the abutment portion 33 and is likely to remain on the axial center side of the rotation shaft 73. In this way, a relatively large amount of lubricant can be left in the contact portion between the cam portion 82 and the abutment portion 33. Therefore, it is possible to suppress the occurrence of a shortage of lubricant in the contact portion between the cam portion 82 and the abutment portion 33.

[0060] The groove portion 83 is composed of five groove portions 83a, 83b, 83c, 83d, and 83e. The groove portions 83a, 83b, 83c, 83d, and 83e are arranged along the axial direction (left-right direction) of the rotating shaft 73. At least some of the groove portions 83 are formed on one side in the left-right direction and the other side in the contact area with the abutment portion 33 of the surface of the cam portion 82, with the second center line C2 as the boundary. Here, the second center line C2 indicates an imaginary line along the front-rear direction that passes through the center in the left-right direction in the contact area with the abutment portion 33 of the surface of the cam portion 82. The groove portions 83a, 83b, and the groove portions 83d, 83e are configured to be line-symmetrical with respect to the second center line C2 in the contact area with the abutment portion 33 of the surface of the cam portion 82. The groove portion 83a is located on the leftmost side of the five groove portions 83. The groove portion 83a is formed in an arc shape in a plan view when the opening / closing device 100 is in the closed state, so that one end (upper end) and the other end (lower end) are located inward (rightward) in the axial direction of the rotating shaft 73 relative to the midway portion. The groove portion 83b is disposed to the right of the groove portion 83a. The groove portion 83b is configured in the same shape as the groove portion 83a. The groove portion 83b is formed in an arc shape in a plan view when the opening / closing device 100 is in the closed state, so that one end (upper end) and the other end (lower end) are located inward (rightward) in the axial direction of the rotating shaft 73 relative to the midway portion. The groove portion 83c is disposed in the center of the five groove portions 83. The groove portion 83c is configured in a straight line in the front-rear direction in a plan view. The groove portion 83d is disposed to the right of the groove portion 83c. Groove portion 83d is formed in an arc shape in plan view when the opening / closing device 100 is in the closed state so that one end (upper end) and the other end (lower end) are located further inward (leftward) in the axial direction of the rotating shaft 73 than the midway portion. Groove portion 83e is located at the rightmost of the five groove portions 83. Groove portion 83e is configured in the same shape as groove portion 83d. Groove portion 83e is formed in an arc shape in plan view when the opening / closing device 100 is in the closed state so that one end (upper end) and the other end (lower end) are located further inward (leftward) in the axial direction of the rotating shaft 73 than the midway portion.

[0061] As described above, at least some of the grooves 83 (groove portions 83a, 83b, 83d, and 83e) are configured such that one end and the other end are located axially inward of the pivot shaft 73 relative to the intermediate portion. Therefore, the lubricant stored in the grooves 83 is guided to flow out axially inward of the pivot shaft 73. Even if the upper fixed member 30 repeatedly rotates relative to the lower fixed member 10, the lubricant moves along the first groove 84 and the second groove 85 in the contact area with the abutment portion 33 on the surface of the cam portion 82 and tends to remain on the axial center side of the pivot shaft 73. For this reason, a relatively large amount of lubricant can be left in the contact portion between the cam portion 82 and the abutment portion 33. Therefore, it is possible to suppress the occurrence of a shortage of lubricant in the contact portion between the cam portion 82 and the abutment portion 33.

[0062] As described above, at least some of the multiple grooves 83 (groove portions 83a, 83b, 83d, and 83e) are configured in an arc shape, so that the lubricant stored in groove portions 83 is guided to flow out toward the inside in the axial direction of the rotating shaft 73, and a relatively large amount of lubricant can be left in the contact portion between the cam portion 82 and the abutment portion 33 even if the upper fixed member 30 repeatedly rotates relative to the lower fixed member 10. Therefore, it is possible to prevent a shortage of lubricant from occurring in the contact portion between the cam portion 82 and the abutment portion 33.

[0063] Furthermore, as described above, at least some of the multiple groove portions 83 are formed on one side and the other side of the second direction, with the second center line C2 as the boundary, so that dispersion of the lubricant at the contact portion between the cam portion 82 and the abutment portion 33 can be suppressed.

[0064] As described above, at least some of the multiple groove portions 83 (groove portions 83a and 83b and groove portions 83d and 83e) are arranged to be symmetrical with respect to the second center line C2, which can prevent the lubricant from dispersing in the contact portion between the cam portion 82 and the abutment portion 33. The number of groove portions 83 is not limited to five, and may be four or less or six or more. Also, groove portion 83 may be configured so that a portion thereof is cut off.

[0065] At least some of the grooves 83 (grooves 83a, 83b, 83d, and 83e) may be formed in a substantially L-shape in plan view when the opening / closing device 110 is in the closed state. At least some of the grooves 83 (grooves 83a, 83b, 83d, and 83e) may be formed in a substantially W-shape in plan view when the opening and closing device 110 is in the closed state. Further, the groove portion 83 is not limited to such a shape, and may be formed into a substantially V-shape, a substantially U-shape, or the like in a plan view when the opening / closing device 110 is in a closed state. Further, some or all of the multiple groove portions 83 may be configured to have different shapes, such as a configuration in which the multiple groove portions 83 are configured to have an arc-shaped portion and a substantially V-shaped portion. Further, instead of being provided in the cam portion 82, the groove portion 83 may be configured to be provided in a contact area with the cam portion 82 on the surface of the abutting portion 33.

[0066] 10 Lower fixing member 20 Intermediate parts 30 Upper fixing member 33 Contact part 40 First Slider 42 First cam part 43 First groove 50 Second Slider 52 Second cam part 53 Second groove 60 Spring material 71 First rotation axis 72 Second rotation axis 73 Rotating shaft 75 First contact part 76 Second contact part 80 Slider 82 Cam section 83 Groove 100 Switchgear 110 Switchgear

Claims

1. An opening and closing device having a base part and a rotating part rotatably provided, the rotating part rotating relative to the base part to perform an opening and closing operation, one of the base portion and the rotating portion moves back and forth along a first direction relative to a surface of the other of the base portion and the rotating portion while a part of the one of the base portion and the rotating portion contacts the surface of the other of the base portion and the rotating portion in association with the opening and closing operation; A first groove portion in which a lubricant is accumulated is formed in the part or the surface, the first groove portion has, in a contact area between the part and the surface, a first groove arranged on one side in the first direction and a second groove arranged on the other side in the first direction, with a first center line along a second direction perpendicular to the first direction passing through a center in the first direction as a boundary; The first groove and the second groove have a shape extending in a direction away from the center in the second direction as they approach the center in the first direction in the contact area. Switchgear.

2. A plurality of the first groove portions are formed in the portion or the surface and are arranged along the second direction, The plurality of first groove portions are formed on one side and the other side in the second direction, with a second center line along the first direction passing through a center in the second direction as a boundary. The opening and closing device according to claim 1 .

3. The plurality of first groove portions are formed to be symmetrical with respect to the second center line. The opening and closing device according to claim 2 .

4. the first groove and the second groove are connected, Each of the first groove portions has an arc or bent shape. The opening and closing device according to claim 1 or 2.

5. One of the base portion and the rotating portion has a first pressure-receiving portion, the other of the base portion and the rotating portion has a slider portion that is movable in a direction approaching and moving away from the first pressure receiving portion and is pressed toward the first pressure receiving portion so as to be continuously in contact with the first pressure receiving portion; the first pressure-receiving portion reciprocates along the first direction relative to the first surface while contacting the first surface of the slider portion; The first groove portion is formed on the first surface. The opening and closing device according to claim 1 or 2.

6. The base portion has the first pressure-receiving portion, The rotating part is a first rotating portion rotatably provided on the base portion and having the slider portion; A second rotating portion rotatably provided on the first rotating portion; having the second rotating portion has a second pressure receiving portion that, as the second rotating portion rotates, moves back and forth along a third direction relative to the second surface while contacting a second surface of the slider portion located on the opposite side to the first surface in the moving direction of the slider portion, a plurality of second grooves arranged along a fourth direction perpendicular to the third direction and configured to hold a lubricant are formed in the second surface or the second pressure-receiving portion; each of the plurality of second groove portions has, in a contact region between the second surface and the second pressure-receiving portion, a third groove arranged on one side in the second direction and a fourth groove arranged on the other side in the second direction, with a third center line along the fourth direction passing through a center in the first direction as a boundary; The third groove and the fourth groove have a shape extending in a direction away from the center in the fourth direction as they approach the center in the third direction in the contact area. The opening and closing device according to claim 5.

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