Opening and closing device

Abstract

The invention provides an opening and closing device which is configured to be capable of suppressing the occurrence of lubricant insufficiency in the opening and closing device. In the opening and closing device (100), one of a base part and a rotating part is partially in contact with the surface of the other of the base part and the rotating part along the opening and closing action and reciprocates relative to the surface along a first direction, and a first groove part (43) for storing a lubricant is formed in the part or the surface. The first groove portion (43) has a first groove (44) disposed on one side in a first direction and a second groove (45) disposed on the other side in the first direction, with a first center line (C1) passing through the center in the first direction and along a second direction orthogonal to the first direction as a boundary in a contact region between the local portion and the surface. The first groove (44) and the second groove (45) have, in the contact region, a portion extending away from the center in the second direction as the portion faces the center in the first direction.

Description

Technical Field

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

[0002] A known document pressing plate opening and closing device comprises: a mounting member; a supporting member rotatably mounted on the mounting member by means of a hinge shaft; a pressure-bearing member provided on the mounting member; a cam slider which makes the cam portion contact the pressure-bearing member and is slidably provided inside the supporting member; and an elastic member which presses the cam slider against the pressure-bearing member and applies force to the supporting member so that the supporting member rotates in an opening direction (see patent document 1). In the document pressing plate opening and closing device, a lubricating grease is applied to a sliding surface between the cam portion of the cam slider and the pressure-bearing member. On the sliding surface, a plurality of grease reservoirs are provided on the cam portion of the cam slider.

[0003] In addition, a hinge is known, which includes: a lower fixing member; a cam member supported by the lower fixing member; a second wing-shaped member rotatably connected to the lower fixing member by means of a first rotating pin; a first slider supported by the second wing-shaped member and movable in a direction approaching the cam member and in a direction away from the cam member; and a spring that applies force to the first slider in a direction approaching the cam member so that the first slider abuts against the cam member (see Patent Document 2). In the hinge, the first slider has a cam abutting surface, the cam member has an abutting surface, and the cam abutting surface abuts against the abutting surface. A groove for accumulating grease is formed on the cam abutting surface of the first slider. In the hinge, a lubricant such as grease is applied to the abutting portion between the cam abutting surface and the abutting surface, and the lubricant is accumulated using a plurality of grooves formed on the cam abutting surface. The groove is configured as a straight line inclined relative to the axial direction of the first rotating pin when viewed from the abutting surface.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Utility Model Registration No. 3231804

[0007] Patent Document 2: Japanese Patent Application Publication No. 2011-175130 Summary of the invention

[0008] Problem that the invention aims to solve

[0009] In the hinge, when the second wing-shaped member rotates in the opening and closing directions relative to the lower fixed member, the first slider is pushed by the spring so that the cam abutting surface contacts the abutting surface and reciprocates along the direction orthogonal to the axial direction of the first rotating pin. In addition, when the second wing-shaped member repeatedly rotates relative to the lower fixed member, the lubricant is divided into a part that moves along the groove and remains in the groove and a part that is scraped out of the groove and remains in the contact portion between the cam abutting surface and the abutting surface. In addition, among the lubricant scraped out of the groove, there is the following lubricant: it moves to the axial outer side of the first rotating pin and transfers to the adjacent groove, and is then squeezed out to the outer side of the contact portion between the cam abutting surface and the abutting surface. Since the lubricant is squeezed out to the outer side of the contact portion between the cam abutting surface and the abutting surface, there is a problem that the lubricant is insufficient in the contact portion between the cam abutting surface and the abutting surface.

[0010] The present invention has been made in view of the above-mentioned situation, and an object of the present invention is to provide an opening and closing device capable of suppressing the occurrence of lubricant shortage.

[0011] Solutions for solving problems

[0012] The problems to be solved by the present invention are as described above, and means for solving the problems will be described below.

[0013] That is, the opening and closing device disclosed in the present application is the following opening and closing device: a rotating part is rotatably arranged on a base part, and an opening and closing action is performed by rotating the rotating part relative to the base part, wherein one of the base part and the rotating part partially contacts a surface of the other of the base part and the rotating part as the opening and closing action occurs, and reciprocates relative to the surface along a first direction, and a first groove portion for accumulating lubricant is formed in the partial portion or the surface, and the first groove portion has 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 passing through the center of the first direction and along a second direction orthogonal to the first direction as a boundary in a contact area between the partial portion and the surface, and the first groove and the second groove have a portion in the contact area extending in a manner away from the center of the second direction as they move toward the center of the first direction.

[0014] Effects of the Invention

[0015] The present invention has the following effects.

[0016] That is, according to the present invention, it is possible to suppress the occurrence of lubricant shortage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a perspective view showing a fully opened state of the opening and closing device according to the embodiment of the present invention.

[0018] Figure 2 This is a front view showing the opening and closing device in the fully open state.

[0019] Figure 3 yes Figure 2 AA line section view in.

[0020] Figure 4 It is a front view showing the opening and closing device in a closed state.

[0021] Figure 5 yes Figure 4 BB line section view in.

[0022] Figure 6 It is a front view showing the opening and closing device in the raised state.

[0023] Figure 7 yes Figure 6 CC line section view in.

[0024] Figure 8 It is a perspective view showing a first slider of the opening and closing device.

[0025] Fig. 9 It is a rear view showing the first slider in the closed state of the opening and closing device.

[0026] Fig.10 It is a perspective view showing a first slider of the opening and closing device.

[0027] Fig.11 It is a rear view showing the first slider in the closed state of the opening and closing device.

[0028] Fig.12 It is a perspective view showing the second slider of the opening and closing device.

[0029] Fig.13 This is a front view showing the second slider in the closed state of the opening and closing device.

[0030] Fig.14 This is a front view showing the second slider in the closed state of the opening and closing device.

[0031] Fig.15 This is a front view showing the second slider in the closed state of the opening and closing device.

[0032] Fig.16 It is a perspective view showing the opening and closing device in the fully opened state.

[0033] Fig.17 This is a front view showing the opening and closing device in the fully open state.

[0034] Fig.18 yes Fig.17 DD line section view in.

[0035] Fig.19 It is a front view showing the opening and closing device in a closed state.

[0036] Fig. 20 yes Fig.19 EE line cross-sectional view.

[0037] Fig.21 It is a top view showing the slider of the opening and closing device.

[0038] Description of Reference Numerals

[0039] 10. Lower fixing member; 20. Intermediate member; 30. Upper fixing member; 33. Abutment portion; 40. First slider; 42. First cam portion; 43. First groove portion; 50. Second slider; 52. Second cam portion; 53. Second groove portion; 60. Spring member; 71. First rotating shaft; 72. Second rotating shaft; 73. Rotating shaft; 75. First abutment portion; 76. Second abutment portion; 80. Slider; 82. Cam portion; 83. Groove portion; 100. Opening and closing device; 110. Opening and closing device. DETAILED DESCRIPTION

[0040] right Figure 1 to Figure 15 The described opening and closing device 100 will be described.

[0041] The opening and closing device 100 is a hinge that connects one of the two components to the other component in an openable and closable manner. In the opening and closing device 100, the rotating part is rotatably arranged on the base part. The opening and closing device 100 performs an opening and closing action by rotating the rotating part relative to the base part. The opening and closing device 100 is used, for example, in OA equipment such as scanners, fax machines, copiers or multi-function devices, automobiles, toilet seats, or various electronic devices such as rice cookers. As another component connected to a component in an openable and closable manner using the opening and closing device 100, for example, there is a door part connected to the main body of a printer in a rotatable manner, a manuscript crimping device connected to the main body of a multi-function device in a rotatable manner, a display connected to a frame in a rotatable manner, a toilet seat connected to a toilet in a rotatable manner, and a hood connected to the body of a car in a rotatable manner.

[0042] The rotation angle θ of the rotating part is defined as follows: the rotation angle θ of the rotating part when the rotating part is closed relative to the base part is set to 0°, and the rotation angle θ increases when the rotating part rotates in the opening direction. In addition, for convenience, the opening and closing device 100 is described below based on the up-down direction, the front-back direction, and the left-right direction of the opening and closing device 100 when the rotating part is closed relative to the base part.

[0043] like Figure 1 to Figure 7 As shown, the opening and closing device 100 includes a lower fixing member 10, an intermediate member 20, an upper fixing member 30, a slider portion having a first slider 40 and a second slider 50, a spring member 60, a damper 62, a first rotation axis 71, a second rotation axis 72, a first contact portion 75, and a second contact portion 76. The first direction of the present invention is orthogonal to the second direction. The second direction of the present invention is parallel to the axial direction of the first rotation axis 71 and parallel to the left-right direction of the opening and closing device 100. The third direction of the present invention is orthogonal to the fourth direction. The fourth direction of the present invention is parallel to the axial direction of the second rotation axis 72 and parallel to the left-right direction of the opening and closing device 100. One embodiment of the base portion of the present invention includes a lower fixing member 10, a first rotation axis 71, and a first contact portion 75. One embodiment of the rotating portion of the present invention includes an intermediate member 20, an upper fixing member 30, a slider portion (a first slider 40 and a second slider 50), a spring member 60, a damper 62, a second rotation axis 72, and a second contact portion 76.

[0044] The lower fixing member 10 is formed by appropriately bending a metal plate and includes a bottom plate 11 , left and right side plates 12 , 12 , and a back plate 13 .

[0045] The bottom plate 11 of the lower fixing member 10 is a plate-like member constituting the lower part of the lower fixing member 10. The bottom plate 11 is in the shape of a generally rectangular shape that is slightly longer in the front-to-back direction when viewed from above. The side plates 12, 12 of the lower fixing member 10 are plate-like members constituting the left and right side parts of the lower fixing member 10. The lower ends of the side plates 12, 12 are connected to the ends of the bottom plate 11. A through hole for inserting the first rotating shaft 71 is provided at the rear upper ends of the side plates 12, 12. A through hole for inserting the first abutting portion 75 is provided at the front upper ends of the side plates 12, 12. The back plate 13 of the lower fixing member 10 is a plate-like member constituting the rear part of the lower fixing member 10. The back plate 13 is in the shape of a generally rectangular shape that is slightly longer in the left-to-right direction when viewed from the front. The lower end of the back plate 13 is connected to the rear end of the bottom plate 11.

[0046] The intermediate member 20 is an embodiment of the first rotating part of the present invention. The intermediate member 20 is formed by appropriately bending a metal plate. The intermediate member 20 includes a top plate 21 and left and right side plates 22, 22. The top plate 21 is arranged on the upper part of the side plates 22, 22, and the side plates 22, 22 are bent downward from the left and right sides of the top plate 21, so that the intermediate member 20 is configured to be an inverted U-shaped when viewed from the front when the opening and closing device 100 is closed. The lower ends of the side plates 22, 22 are bent in a manner extending toward the central side in the left and right directions, so that the intermediate member 20 is configured to be a box-shaped with an opening in the central part of the left and right directions on the lower side. The intermediate member 20 is rotatably supported by the lower fixed member 10 by means of the first rotating shaft 71 in a state where the first slider 40, the second slider 50, the spring member 60, the shock absorber 62, etc. are accommodated. A through hole for inserting the first rotating shaft 71 is opened at the rear of the side plates 22, 22. A through hole for inserting the second rotation shaft 72 is formed in the front end portions of the side plates 22 , 22 .

[0047] The first rotating shaft 71 is a substantially cylindrical member. The first rotating shaft 71 is inserted into the through holes at the rear of the side plates 22, 22 of the intermediate member 20 and the through holes at the rear upper ends of the side plates 12, 12 of the lower fixing member 10. The intermediate member 20 is rotatably connected to the lower fixing member 10 by means of the first rotating shaft 71.

[0048] The upper fixing member 30 is an embodiment of the second rotating part of the present invention. The upper fixing member 30 is formed by appropriately bending a metal plate. The upper fixing member 30 includes a top plate 31 and left and right side plates 32, 32. The top plate 31 is arranged on the upper part of the side plates 32, 32, and the side plates 32, 32 are bent downward from the left and right sides of the top plate 31, so that the upper fixing member 30 is configured to be an inverted U-shaped when viewed from the front when the opening and closing device 100 is in a closed state. The upper fixing member 30 is rotatably supported on the intermediate member 20 by means of 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, 32. A through hole for installing the second abutment portion 76 is opened at the front lower end of the side plates 32, 32.

[0049] The second rotation shaft 72 is a substantially cylindrical member. The second rotation shaft 72 is inserted into the through holes at the front upper ends of the side plates 32, 32 of the upper fixing member 30 and the through holes at the front ends of the side plates 22, 22 of the intermediate member 20. The upper fixing member 30 is rotatably connected to the intermediate member 20 via the second rotation shaft 72.

[0050] The second abutting portion 76 is an embodiment of the second pressure receiving portion of the present invention. The second abutting portion 76 is configured in a pin shape. The second abutting portion 76 is inserted into the through hole of the front lower end portion of the side plates 32, 32 and fixed to the upper fixing member 30. The surface of the second abutting portion 76 on the side of the second slider 50 contacts the second cam portion 52 of the second slider 50. In addition, the second abutting portion 76 is not limited to a pin-shaped structure, and can also be set to other structures such as a structure configured in a block shape and a structure configured by bending a plate-shaped member.

[0051] The first slider 40 is formed of a resin material. The first slider 40 is open at the front and has a bottom at the rear. The first slider 40 is provided with a first cam portion 42 formed of a curved surface on the rear surface of the bottom. The first cam portion 42 is an embodiment of the first surface of the present invention. The first slider 40 is configured to contact the first abutment portion 75 at the first cam portion 42. A spring receiving hole for receiving the rear end portion of the spring member 60 is formed in the first slider 40. The first slider 40 is received in the rear portion of the interior of the intermediate member 20 in a manner that allows sliding 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.

[0052] The second slider 50 is formed of a resin material. The rear of the second slider 50 is open, and a bottom is provided at the front. The second slider 50 is provided with a second cam portion 52 on the front surface of the bottom. The second cam portion 52 is an embodiment of the second surface of 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 for receiving the front end portion of the spring member 60 is formed in the second slider 50. The second slider 50 is received in the front portion of the interior of the intermediate member 20 in a manner that allows sliding 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.

[0053] The rotating part changes between a fully open state and a closed state relative to the base. The state in which the rotating part is closest to the base is referred to as the "closed state" of the rotating part. The rotation angle θ of the rotating part relative to the base in the closed state is 0° (refer to Figure 4 or Figure 5 ). In addition, the state in which the rotating part is farthest from the base part is referred to as the "fully open state" of the rotating part. The fully open state refers to the state in which the rotation angle θ of the rotating part relative to the base part is 60° (refer to Figure 2 or Figure 3). In addition, the state of the rotating part between the closed state and the fully open state is set as the "open state" of the rotating part. The open state refers to a state in which the rotation angle θ satisfies the relationship of 0°<θ<60°. In addition, the closed state of the rotating part is not limited to the rotation angle θ being 0°, and the fully open state of the rotating part is not limited to the rotation angle θ being 60°. 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 also be appropriately set to other angles according to specifications, uses, etc.

[0054] like Figure 6 or Figure 7 As shown, the opening and closing device 100 can be set to a state where the intermediate member 20 is opened relative to the lower fixing member 10 and the upper fixing member 30 is opened relative to the intermediate member 20, that is, a raised state.

[0055] The spring member 60 is composed of a metal coil spring. The spring member 60 is accommodated in the spring accommodation 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 accommodation hole formed in the first slider 40 and is in contact with the bottom surface of the spring accommodation hole. In addition, the front end of the spring member 60 is inserted into the spring accommodation hole formed in the second slider 50 and is in contact with the bottom surface of the spring accommodation hole.

[0056] Due to the elastic force of the spring member 60 , the first slider 40 is pressed toward the first abutment portion 75 in the longitudinal direction of the intermediate member 20 , and the second slider 50 is pressed toward the second abutment portion 76 in the longitudinal direction of the intermediate member 20 .

[0057] The shock absorber 62 is received in the spring receiving holes of the first slider 40 and the second slider 50. The main body of the shock absorber 62 is fixed to the bottom of the first slider 40, and the top end thereof protrudes toward the second rotation axis 72. The shock absorber 62 generates a reaction force when the top end is pressed by the bottom of the second slider 50. Therefore, the speed at which the first slider 40 moves decreases due to the reaction force, and a buffering effect is generated by the shock absorber 62. The shock absorber 62 is composed of a common fluid shock absorber.

[0058] The first abutment portion 75 is an embodiment of the first pressure-receiving portion of the present invention. The first abutment portion 75 is formed of a resin material and is pin-shaped. The first abutment portion 75 is inserted into the through hole of the front upper end portion of the side plates 12, 12 and fixed to the lower fixing member 10 at a position forward of the first rotation axis 71. The surface of the first abutment portion 75 on the side of the first slider 40 is formed of a curved surface and contacts the first cam portion 42 of the first slider 40. In addition, the first abutment portion 75 is not limited to a pin-shaped structure, and can also be set to other structures such as a structure formed in a block shape and a structure formed by bending a plate-shaped member.

[0059] When the first contact portion 75 is mounted on the lower fixing 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 pushed by the elastic force generated by the spring member 60, and the intermediate member 20 is pushed in the opening direction relative to the lower fixing member 10. In addition, the second slider 50 is pushed by the elastic force generated by the spring member 60, and the upper fixing member 30 is pushed in the closing direction relative to the intermediate member 20. At this time, the top end of the damper 62 is pushed by the bottom of the second slider 50 and is pushed toward the main body side of the damper 62.

[0060] When the rotating part is set to the open 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 pushed by the elastic force of the spring member 60, and the intermediate member 20 is pushed to rotate in the opening direction relative to the lower fixing member 10. In addition, the second slider 50 is pushed by the elastic force of the spring member 60, and the upper fixing member 30 is pushed to rotate in the closing direction relative to the intermediate member 20.

[0061] When the rotating part is in the fully opened 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 pushed by the elastic force of the spring member 60, and the intermediate member 20 is pushed to rotate in the opening direction relative to the lower fixing member 10. In addition, the second slider 50 is pushed by the elastic force of the spring member 60, and the upper fixing member 30 is pushed to rotate in the closing direction relative to the intermediate member 20.

[0062] That is, regardless of the rotation angle θ of the rotating portion, the first slider 40 is pushed toward the first contact portion 75 from the closed state of the rotating portion to the fully opened state, so that the first cam portion 42 is continuously in contact with the first contact portion 75. From the closed state of the rotating portion to the fully opened state, the first cam portion 42 of the first slider 40 is in contact with the first contact portion 75, and the second cam portion 52 of the second slider 50 is in contact with the second contact portion 76. Due to the elastic force generated by the spring member 60, the intermediate member 20 is pushed so as to rotate in the opening direction relative to the lower fixing member 10, and the upper fixing member 30 is pushed so as to rotate in the closing direction relative to the intermediate member 20.

[0063] As the intermediate member 20 rotates in the opening and closing directions relative to the lower fixing member 10, the first slider 40 is pushed by the spring member 60, so that a portion of the first cam portion 42 contacts the surface of the first abutment portion 75 and reciprocates relative to the surface of the first abutment portion 75 along a direction (first direction) orthogonal to the axial direction of the first rotating shaft 71.

[0064] Figure 8 and Fig. 9 It indicates that the opening and closing device 100 is in Figure 4 FIG. 4 is a diagram of the first slider 40 in the state of FIG. 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. Figure 8 or Fig. 9 As shown, the first cam portion 42 is provided with a plurality of first groove portions 43 in the contact region between the first abutment portion 75 and the surface thereof. The first groove portion 43 is configured to store lubricant. At least a portion of the plurality of first groove portions 43 is configured to extend from the axially outer side to the axially inner side of the first rotation shaft 71. At least a portion of the plurality of first groove portions 43 guides the lubricant stored in the first groove portion 43 to flow out to the axially inner side of the first rotation shaft 71 when the intermediate member 20 repeatedly rotates relative to the lower fixing member 10. Due to such a configuration, even if the intermediate member 20 repeatedly rotates relative to the lower fixing member 10, a relatively large amount of lubricant can be retained 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 lubricant shortage in the contact portion between the first cam portion 42 and the first abutment portion 75.

[0065] At least a portion of the first groove portions 43 among the plurality of first groove portions 43 have a first groove 44 and a second groove 45. The first groove 44 is arranged on one side (the upper side) in the up-down direction with the first center line C1 as a boundary in the contact area between the surface of the first cam portion 42 and the first abutment portion 75. The second groove 45 is arranged on the other side (the lower side) in the up-down direction with the first center line C1 as a boundary in the contact area between the surface of the first cam portion 42 and the first abutment portion 75. The first center line C1 represents an imaginary line passing through the center of the up-down direction and along the left-right direction in the contact area between the surface of the first cam portion 42 and the first abutment portion 75. The first groove 44 and the second groove 45 have portions in the contact area between the surface of the first cam portion 42 and the first abutment portion 75 that extend in a manner that moves away from the center of the left-right direction as it moves toward the center of the up-down direction. In addition, it is preferred that Fig. 9In the embodiment, the first groove portion 43 is formed in such a manner that both ends thereof are located on a straight line along the vertical direction or are located near the straight line. Due to such a configuration, regardless of whether the rotating portion is in a fully open state or a closed state, the portion where the first groove portion 43 contacts the first abutting portion 75 is relatively closer to the center in the left-right direction than when the groove portion is in a straight line shape inclined relative to the vertical direction as in the past. Therefore, even if the intermediate member 20 repeatedly rotates relative to the lower fixed member 10, in the contact area between the surface of the first cam portion 42 and the first abutting portion 75, the lubricant is likely to move along the first groove 44 and the second groove 45 and 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 abutting portion 75. Therefore, it is possible to suppress the occurrence of lubricant shortage in the contact portion between the first cam portion 42 and the first abutting portion 75.

[0066] In the present embodiment, five first grooves 43a, 43b, 43c, 43d, and 43e are provided as the plurality of first grooves 43. The first grooves 43a, 43b, 43c, 43d, and 43e are arranged in the left-right direction. At least a portion of the first grooves 43 among the plurality of first grooves 43 are formed on one side and the other side of the left-right direction in the contact region between the surface of the first cam portion 42 and the first abutting portion 75, respectively, with the second center line C2 as the boundary. Among them, the second center line C2 represents an imaginary line passing through the center of the left-right direction and along the up-down direction in the contact region between the surface of the first cam portion 42 and the first abutting portion 75. The first grooves 43a and 43b and the first grooves 43d and 43e are configured in a line-symmetrical manner with respect to the second center line C2 in the contact region between the surface of the first cam portion 42 and the first abutting portion 75. The first groove 43a is arranged at the leftmost side among the five first grooves 43. The first groove portion 43a is formed into an arc shape when viewed from behind in the closed state of the opening and closing device 100 in a manner that one end (upper end) and the other end (lower end) are located at a position axially inward (rightward) of the first rotating shaft 71 relative to the midway portion. The first groove portion 43b is arranged to the right of the first groove portion 43a. The first groove portion 43b is configured to have the same shape as the shape of the first groove portion 43a. The first groove portion 43b is formed into an arc shape when viewed from behind in the closed state of the opening and closing device 100 in a manner that one end (upper end) and the other end (lower end) are located at a position axially inward (rightward) of the first rotating shaft 71 relative to the midway portion. The first groove portion 43c is arranged in the center among the five first groove portions 43. The first groove portion 43c is configured to be linear in the up-down direction when viewed from behind. The first groove portion 43d is arranged to the right of the first groove portion 43c. The first groove portion 43d is formed in an arc shape when viewed from behind in the closed state of the opening and closing device 100 in such a manner that one end (upper end) and the other end (lower end) are located at a position axially inward (leftward) of the first rotating shaft 71 relative to the midway portion. The first groove portion 43e is arranged at the rightmost among the five first groove portions 43. The first groove portion 43e is configured to have the same shape as the shape of the first groove portion 43d. The first groove portion 43e is formed in an arc shape when viewed from behind in the closed state of the opening and closing device 100 in such a manner that one end (upper end) and the other end (lower end) are located at a position axially inward (leftward) of the first rotating shaft 71 relative to the midway portion.

[0067] As described above, at least a part of the first grooves 43 (the first grooves 43a, 43b, 43d, and 43e) among the plurality of first grooves 43 is configured so that one end and the other end are located axially inward of the first rotation shaft 71 relative to the midway portion, and thus the lubricant accumulated in the first grooves 43 is guided so as to flow out axially inward of the first rotation shaft 71. Thus, even if the intermediate member 20 repeatedly rotates relative to the lower fixing member 10, the lubricant is likely to move along the first grooves 44 and the second grooves 45 in the contact area between the surface of the first cam portion 42 and the first abutment portion 75 and remain on the axial center side of the first rotation shaft 71. Therefore, a relatively large amount of lubricant can be retained 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.

[0068] In addition, as described above, at least a part of the first grooves 43 (the first grooves 43a, 43b, 43d, and 43e) among the plurality of first grooves 43 is formed in an arc shape, and therefore, the lubricant accumulated in the first grooves 43 is guided so as to flow out to the axial inner side of the first rotation shaft 71. Thus, even if the intermediate member 20 repeatedly rotates relative to the lower fixing member 10, a relatively large amount of lubricant can be left in the contact portion between the first cam portion 42 and the first abutting 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 abutting portion 75.

[0069] In addition, as described above, at least a portion of the multiple first grooves 43 are formed on one side and the other side of the left and right directions with the second center line C2 as the boundary, so that the contact portion between the first cam portion 42 and the first abutment portion 75 can suppress the amount of lubricant from fluctuating depending on the position.

[0070] In addition, as described above, at least a portion of the first groove portions 43 (the first groove portions 43a, 43b and the first groove portions 43d, 43e) among the plurality of first groove portions 43 are arranged in a line-symmetrical manner relative to the second center line C2, so that the amount of lubricant can be suppressed from fluctuating according to the position at the contact portion between the first cam portion 42 and the first abutment portion 75. In addition, the number of the first groove portions 43 is not limited to five, and may be less than four or more than six. In addition, the first groove portion 43 may also be configured in a manner in which a portion thereof is cut off. In addition, the first groove portion 43 may include a portion extending in a manner away from the second center line C2 as it moves toward the first center line C1, and the size thereof is not particularly limited. Moreover, the first groove portion 43 may be a groove portion that allows the lubricant to flow as described above, and, for example, may be configured by bringing together a plurality of holes.

[0071] like Fig.10As shown, at least a portion of the plurality of first grooves 43 (first grooves 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.

[0072] like Fig.11 As shown, at least a portion of the plurality of first grooves 43 (first grooves 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.

[0073] In addition, the first groove portion 43 is not limited to such a shape, and may be formed in a substantially V-shaped, substantially U-shaped, etc. when viewed from behind when the opening and closing device 100 is in the closed state. In addition, a part of the first groove portions 43 or all of the first groove portions 43 may be formed of groove portions of different shapes, such as, for example, a plurality of first groove portions 43 are formed of arc-shaped groove portions and a groove portion formed in a substantially V-shaped groove portion. In addition, the first groove portion 43 may be provided in the contact area between the surface of the first abutting portion 75 and the first cam portion 42, instead of the structure provided in the first cam portion 42.

[0074] As the upper fixing member 30 rotates in the opening and closing directions relative to the intermediate member 20, the second slider 50 is pushed by the spring member 60, so that a portion of the second cam portion 52 contacts the surface of the second abutment portion 76 and reciprocates relative to the surface of the second abutment portion 76 along a direction (third direction) orthogonal to the axial direction of the second rotating shaft 72.

[0075] Fig.12 and Fig.13 It indicates that the opening and closing device 100 is in Figure 4 FIG. 5 shows a second slider 50 in a state of . 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. Fig.12 or Fig.13As shown, the second cam portion 52 is provided with a plurality of second groove portions 53 in the contact region between the second abutment portion 76 and the surface thereof. The second groove portion 53 is configured to store lubricant. At least a portion of the plurality of second groove portions 53 is configured to extend from the axially outer side to the axially inner side of the second rotation shaft 72. At least a portion of the plurality of second groove portions 53 guides the lubricant stored in the second groove portion 53 to flow out to the axially inner side of the second rotation shaft 72 when the upper fixing member 30 repeatedly rotates relative to the intermediate member 20. Due to such a configuration, even if the upper fixing member 30 repeatedly rotates relative to the intermediate member 20, a relatively large amount of lubricant can be retained 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 lubricant shortage in the contact portion between the second cam portion 52 and the second abutment portion 76.

[0076] At least a portion of the second groove portions 53 among the plurality of second groove portions 53 have a third groove 54 and a fourth groove 55. The third groove 54 is arranged on one side (the upper side) in the up-down direction with the third center line C3 as a boundary in the contact area between the surface of the second cam portion 52 and the second abutment portion 76. The fourth groove 55 is arranged on the other side (the lower side) in the up-down direction with the third center line C3 as a boundary in the contact area between the surface of the second cam portion 52 and the second abutment portion 76. The third center line C3 represents an imaginary line passing through the center of the up-down direction and along the left-right direction in the contact area between the surface of the second cam portion 52 and the second abutment portion 76. The third groove 54 and the fourth groove 55 have a portion in the contact area between the surface of the second cam portion 52 and the second abutment portion 76 that extends away from the center of the left-right direction as it moves toward the center of the up-down direction. In addition, it is preferred that Fig.13 In the embodiment, the second groove portion 53 is formed in such a manner that both ends thereof are located on a straight line along the vertical direction or are located near the straight line. Due to such a configuration, regardless of whether the upper fixing member 30 is in a fully open state or a closed state relative to the intermediate member 20, the portion where the second groove portion 53 contacts the second abutting portion 76 is relatively closer to the center in the left-right direction than when the groove portion is in a straight line shape inclined relative to the vertical direction as in the past. Therefore, the lubricant is likely to remain on the center side in the left-right direction. That is, even if the upper fixing member 30 repeatedly rotates relative to the intermediate member 20, in the contact area between the surface of the second cam portion 52 and the second abutting portion 76, the lubricant is likely to move along the third groove 54 and the fourth groove 55 and 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 abutting portion 76. Therefore, it is possible to suppress the occurrence of lubricant shortage in the contact portion between the second cam portion 52 and the second abutting portion 76.

[0077] In the present embodiment, five second grooves 53a, 53b, 53c, 53d, and 53e are provided as the plurality of second grooves 53. The second grooves 53a, 53b, 53c, 53d, and 53e are arranged in the left-right direction. At least a part of the second grooves 53 among the plurality of second grooves 53 are formed on one side and the other side of the left-right direction in the contact region between the surface of the second cam portion 52 and the second abutting portion 76, respectively, with the fourth center line C4 as a boundary. Among them, the fourth center line C4 represents an imaginary line passing through the center of the left-right direction and along the up-down direction in the contact region between the surface of the second cam portion 52 and the second abutting portion 76. The second grooves 53a and 53b and the second grooves 53d and 53e are configured in a line-symmetrical manner with respect to the fourth center line C4 in the contact region between the surface of the second cam portion 52 and the second abutting portion 76. The second groove 53a is arranged at the leftmost side among the five second grooves 53. The second groove portion 53a is formed into an arc shape when viewed from the front in the closed state of the opening and closing device 100 in such a manner that one end (upper end) and the other end (lower end) are located at a position axially inward (to the right) of the second rotating shaft 72 relative to the midway portion. The second groove portion 53b is arranged to the right of the second groove portion 53a. The second groove portion 53b is configured to have the same shape as the shape of the second groove portion 53a. The second groove portion 53b is formed into an arc shape when viewed from the front in the closed state of the opening and closing device 100 in such a manner that one end (upper end) and the other end (lower end) are located at a position axially inward (to the right) of the second rotating shaft 72 relative to the midway portion. The second groove portion 53c is arranged in the center among the five second groove portions 53. The second groove portion 53c is configured to be linear in the up-down direction when viewed from the front. The second groove portion 53d is arranged to the right of the second groove portion 53c. The second groove portion 53d is formed in an arc shape when viewed from the front in the closed state of the opening and closing device 100 in such a manner that one end (upper end) and the other end (lower end) are located at a position axially inward (leftward) of the second rotating shaft 72 relative to the midway portion. The second groove portion 53e is arranged at the rightmost among the five second groove portions 53. The second groove portion 53e is configured to have the same shape as the shape of the second groove portion 53d. The second groove portion 53e is formed in an arc shape when viewed from the front in the closed state of the opening and closing device 100 in such a manner that one end (upper end) and the other end (lower end) are located at a position axially inward (leftward) of the second rotating shaft 72 relative to the midway portion.

[0078] As described above, at least a part of the second groove portions 53 (second groove portions 53a, 53b, 53d, 53e) among the plurality of second groove portions 53 is configured so that one end and the other end are located in the axial inner side of the second rotation shaft 72 relative to the middle portion, and therefore, the lubricant accumulated in the second groove portion 53 is guided so as to flow out in the axial inner side of the second rotation shaft 72. Thus, even if the upper fixing member 30 repeatedly rotates relative to the intermediate member 20, the lubricant is likely to move along the third groove 54 and the fourth groove 55 in the contact area between the surface of the second cam portion 52 and the second abutment portion 76 and remain on the axial center side of the second rotation shaft 72. Therefore, a relatively large amount of lubricant can be retained 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 lubricant shortage in the contact portion between the second cam portion 52 and the second abutment portion 76.

[0079] In addition, as described above, at least a part of the second grooves 53 (the second grooves 53a, 53b, 53d, and 53e) among the plurality of second grooves 53 is formed in an arc shape, and therefore, the lubricant accumulated in the second grooves 53 is guided so as to flow out to the axial inner side of the second rotation shaft 72. Thus, even if the upper fixing member 30 repeatedly rotates relative to the intermediate member 20, a relatively large amount of lubricant can be left in the contact portion between the second cam portion 52 and the second abutting 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 abutting portion 76.

[0080] In addition, as described above, at least a portion of the plurality of second groove portions 53 are formed on one side and the other side of the left-right direction with the fourth center line C4 as the boundary, so that the amount of lubricant in the contact portion between the second cam portion 52 and the second abutment portion 76 can be suppressed from fluctuating depending on the position.

[0081] In addition, as described above, at least a portion of the second groove portions 53 (the second groove portions 53a, 53b and the second groove portions 53d, 53e) among the plurality of second groove portions 53 are configured in a line-symmetrical manner relative to the fourth center line C4, so that the amount of lubricant can be suppressed from fluctuating according to the position in the contact portion between the second cam portion 52 and the second abutment portion 76. In addition, the number of second groove portions 53 is not limited to five, and may be less than four or more than six. In addition, the second groove portion 53 may also be configured in a manner in which a portion thereof is cut off. In addition, the second groove portion 53 preferably includes a portion extending in a manner away from the fourth center line C4 as it moves toward the third center line C3, and the size of the portion is not particularly limited. Moreover, the second groove portion 53 may be a groove portion that allows the lubricant to flow as described above, and, for example, may be configured by bringing together a plurality of holes.

[0082] like Fig.14As shown, at least a portion of the second groove portions 53 (second groove portions 53a, 53b, 53d, 53e) among the plurality of second groove portions 53 may be formed in a substantially L-shape in a front view when the opening and closing device 100 is in the closed state.

[0083] like Fig.15 As shown, at least a portion of the second grooves 53 (second grooves 53a, 53b, 53d, 53e) among the plurality of second grooves 53 may be formed in a substantially W-shape in a front view when the opening and closing device 100 is in the closed state.

[0084] In addition, the second groove portion 53 is not limited to such a shape, and may be formed in a substantially V-shaped, substantially U-shaped, etc. when viewed from behind when the opening and closing device 100 is in the closed state. In addition, a part of the second groove portions 53 or all of the second groove portions 53 may be formed of groove portions of different shapes, such as, for example, a plurality of second groove portions 53 are formed of arc-shaped groove portions and substantially V-shaped groove portions. In addition, the second groove portion 53 may be provided in the contact area between the surface of the second abutting portion 76 and the second cam portion 52, instead of being provided in the second cam portion 52.

[0085] Next, Figure 16 to Figure 21 The described opening and closing device 110 is described. Figure 16 to Figure 21 In the description of the opening and closing device 110, the Figure 1 to Figure 15 The description of the same parts of the opening and closing device 100 as those described above is as follows. Figure 1 to Figure 15 The description will focus on the different parts of the described opening and closing device 100.

[0086] like Figures 16 to 20 As shown, the opening and closing device 110 includes a lower fixing member 10, an upper fixing member 30, a spring member 60, a rotating shaft 73, and a slider 80. The second direction of 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 of the present invention includes the lower fixing member 10, the slider 80, the spring member 60, and the rotating shaft 73. One embodiment of the rotating portion of the present invention includes the upper fixing member 30.

[0087] The lower fixing member 10 is a substantially cylindrical member having an opening at the top and a bottom at the bottom, with the vertical direction being the longitudinal direction. The slider 80 is accommodated in the space inside the lower fixing member 10 .

[0088] The lower fixing member 10 includes left and right support portions 14, 14. The support portions 14 protrude upward from the left and right portions at the upper rear portion of the lower fixing member 10. The support portions 14 rotatably support the upper fixing member 30 via the rotation shaft 73. A through hole for inserting the rotation shaft 73 is formed in the support portion 14.

[0089] In the closed state of the rotating part in the opening and closing device 110, the rotation angle θ of the rotating part relative to the base part is 0° (refer to Fig.19 or Fig. 20 ). In addition, the fully open state of the rotating part in the opening and closing device 110 refers to a state in which the rotation angle θ of the rotating part relative to the base part is 70° (refer to Fig.17 or Fig.18 ). In addition, the state of the rotating part between the closed state and the fully open state is set as the "open state" of the rotating part. The open state refers to a state in which the rotation angle θ satisfies the relationship of 0°<θ<70°. In addition, the closed state of the rotating part is not limited to the rotation angle θ being 0°, and the fully open state of the rotating part is not limited to the rotation angle θ being 70°. 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 also be appropriately set to other angles according to specifications, uses, etc.

[0090] The upper fixing member 30 is rotatably connected to the lower fixing member 10 by means of a rotating shaft 73. A through hole for inserting the rotating shaft 73 is provided at the rear of the upper fixing member 30. The upper fixing member 30 includes a contact portion 33. The contact portion 33 is an embodiment of the first pressure receiving portion of the present invention. The contact portion 33 is composed of a cam surface that protrudes downward at the lower part of the upper fixing member 30 and has a curved lower end. The surface of the contact portion 33 on the side of the slider 80 contacts the cam portion 82 of the slider 80.

[0091] The rotation shaft 73 is inserted into the through hole of the support portion 14 of the lower fixing member 10 and the through hole of the upper fixing member 30. The rotation shaft 73 is a member that serves as a rotation shaft that rotatably connects the upper fixing member 30 to the lower fixing member 10. The rotation shaft 73 is a substantially cylindrical member, and is inserted into the rear of the upper fixing member 30 and the lower fixing member 10. As a result, the upper fixing member 30 is rotatably connected to the lower fixing member 10 via the rotation shaft 73.

[0092] The slider 80 is an embodiment of the slider portion of the present invention. The slider 80 is formed of a resin material. The slider 80 is configured to be cylindrical with an opening at the bottom and a bottom at the top. The slider 80 is provided with a cam portion 82 protruding upward on the upper surface of the bottom. The cam portion 82 is an embodiment of the first surface of the present invention. The slider 80 is configured to contact the abutment portion 33 of the upper fixing member 30 at the cam portion 82. A spring receiving hole for receiving the upper end portion of the spring member 60 is formed on the lower surface of the bottom of the slider 80. The slider 80 is received in the lower fixing member 10 and is configured to be slidable in the direction of approaching and moving away from the abutment portion 33 of the upper fixing member 30. A lubricant is applied to the contact portion between the cam portion 82 and the abutment portion 33 to suppress wear.

[0093] The spring member 60 is accommodated in the slider 80. The upper end of the spring member 60 is inserted into the spring accommodation hole formed in the slider 80 and is brought into contact with the bottom surface of the spring accommodation hole. In addition, the lower end of the spring member 60 is brought into contact with the bottom upper surface of the lower fixing member 10. Due to the elastic force generated by the spring member 60, the slider 80 is pushed toward the direction (upward) approaching the contact portion 33 of the upper fixing member 30. The spring member 60 pushes the slider 80, so that the cam portion 82 is brought into contact with the contact portion 33, and the upper fixing member 30 is pushed toward the opening direction relative to the lower fixing member 10.

[0094] As the upper fixing member 30 rotates in the opening and closing directions relative to the lower fixing member 10, the slider 80 is pushed by the spring member 60, so that a portion of the cam portion 82 contacts the surface of the abutment portion 33 and reciprocates relative to the surface of the abutment portion 33 along a direction (front-to-back direction) orthogonal to the axial direction of the rotating shaft 73.

[0095] In this embodiment, the front-to-back direction corresponds to the "first direction" of the present invention, and the left-to-right direction corresponds to the "second direction" of the present invention. Fig.21 As shown, the cam portion 82 is provided with a plurality of groove portions 83 in the contact area between the surface and the abutment portion 33. The groove portion 83 is an embodiment of the first groove portion of the present invention. The groove portion 83 is configured to store lubricant. At least a portion of the plurality of groove portions 83 is configured to extend from the axially outer side to the axially inner side of the rotation shaft 73. At least a portion of the plurality of groove portions 83 guides the lubricant stored in the groove portion 83 to flow out toward the axial inner side of the rotation shaft 73 when the upper fixing member 30 rotates repeatedly relative to the lower fixing member 10. Due to such a configuration, even if the upper fixing member 30 rotates repeatedly 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 lubricant shortage in the contact portion between the cam portion 82 and the abutment portion 33.

[0096] At least a portion of the plurality of groove portions 83 have a first groove 84 and a second groove 85. The first groove 84 is arranged on one side (the front side) in the front-to-back direction with the first center line C1 as a boundary in the contact area between the surface of the cam portion 82 and the abutment portion 33. The second groove 85 is arranged on the other side (the rear side) in the front-to-back direction with the first center line C1 as a boundary in the contact area between the surface of the cam portion 82 and the abutment portion 33. The first center line C1 represents an imaginary line passing through the center of the front-to-back direction and along the left-to-right direction in the contact area between the surface of the cam portion 82 and the abutment portion 33. The first groove 84 and the second groove 85 have portions in the contact area between the surface of the cam portion 82 and the abutment portion 33 that extend in a manner that moves away from the center of the left-to-right direction as they move toward the center of the front-to-back direction. In addition, it is preferred that Fig.21 In the embodiment, the groove portion 83 is formed in such a way that its two ends are located on a straight line along the front-to-back direction or near the straight line. Due to such a configuration, regardless of whether the rotating portion is in a fully open state or a closed state, the portion where the groove portion 83 contacts the abutment portion 33 is relatively closer to the center in the left-right direction than the case where the groove portion is in a straight line inclined relative to the front-to-back direction as in the past. Therefore, even if the upper fixing member 30 rotates repeatedly relative to the lower fixing member 10, in the contact area between the surface of the cam portion 82 and the abutment portion 33, the lubricant is easy to move along the first groove 84 and the second groove 85 and remain on the axial center side of the rotating 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 lubricant shortage in the contact portion between the cam portion 82 and the abutment portion 33.

[0097] In the present embodiment, five grooves 83a, 83b, 83c, 83d, and 83e are provided as the plurality of grooves 83. The grooves 83a, 83b, 83c, 83d, and 83e are arranged along the axial direction (left-right direction) of the rotation shaft 73. At least a part of the plurality of grooves 83 is formed on one side and the other side of the left-right direction in the contact area between the surface of the cam portion 82 and the abutment portion 33, with the second center line C2 as the boundary. Among them, the second center line C2 represents an imaginary line passing through the center of the left-right direction and along the front-back direction in the contact area between the surface of the cam portion 82 and the abutment portion 33. The grooves 83a, 83b and the grooves 83d and 83e are configured in a line-symmetrical manner with respect to the second center line C2 in the contact area between the surface of the cam portion 82 and the abutment portion 33. The groove 83a is arranged at the leftmost side among the five grooves 83. The groove portion 83a is formed into an arc shape when viewed from above in the closed state of the opening and closing device 110 in such a manner that one end (upper end) and the other end (lower end) are located at a position closer to the axial inner side (right side) of the rotating shaft 73 than the midway portion. The groove portion 83b is arranged to the right of the groove portion 83a. The groove portion 83b is configured to have the same shape as the shape of the groove portion 83a. The groove portion 83b is formed into an arc shape when viewed from above in the closed state of the opening and closing device 110 in such a manner that one end (upper end) and the other end (lower end) are located closer to the axial inner side (right side) of the rotating shaft 73 than the midway portion. The groove portion 83c is arranged in the center among the five groove portions 83. The groove portion 83c is configured to be a straight line in the front-rear direction when viewed from above. The groove portion 83d is arranged to the right of the groove portion 83c. The groove portion 83d is formed into an arc shape when viewed from above in the closed state of the opening and closing device 110 in such a manner that one end (upper end) and the other end (lower end) are located at a position axially inward (leftward) of the rotation shaft 73 relative to the midway portion. The groove portion 83e is arranged at the rightmost among the five groove portions 83. The groove portion 83e is configured to have the same shape as the groove portion 83d. The groove portion 83e is formed into an arc shape when viewed from above in the closed state of the opening and closing device 110 in such a manner that one end (upper end) and the other end (lower end) are located at a position axially inward (leftward) of the rotation shaft 73 relative to the midway portion.

[0098] As described above, at least a part of the grooves 83 (grooves 83a, 83b, 83d, 83e) among the plurality of grooves 83 is configured so that one end and the other end are located axially inward of the rotation shaft 73 relative to the midway portion, and thus the lubricant accumulated in the grooves 83 is guided so as to flow out axially inward of the rotation shaft 73. Thus, even if the upper fixing member 30 repeatedly rotates relative to the lower fixing member 10, the lubricant is likely to move 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 remain on the axial center side of the rotation shaft 73. Therefore, 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 lubricant shortage in the contact portion between the cam portion 82 and the abutment portion 33.

[0099] In addition, as described above, at least a portion of the grooves 83 (grooves 83a, 83b, 83d, 83e) among the plurality of grooves 83 is formed in an arc shape, and therefore, the lubricant accumulated in the grooves 83 is guided so as to flow out to the axial inner side of the rotating shaft 73. Thus, 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 abutting 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 abutting portion 33.

[0100] In addition, as described above, at least a portion of the multiple grooves 83 are formed on one side and the other side of the second direction (left-right direction) with the second center line C2 as the boundary, so that the contact portion between the cam portion 82 and the abutment portion 33 can suppress the amount of lubricant from fluctuating depending on the position.

[0101] In addition, as described above, at least a portion of the plurality of grooves 83 (grooves 83a, 83b and grooves 83d, 83e) are arranged in a line-symmetrical manner relative to the second center line C2, so that the amount of lubricant in the contact portion between the cam portion 82 and the abutment portion 33 can be suppressed from fluctuating according to the position. In addition, the number of grooves 83 is not limited to five, and may be less than four or more than six. In addition, the groove 83 may also be configured in a manner in which a portion thereof is cut off. In addition, the groove 83 may include a portion extending in a manner away from the second center line C2 as it moves toward the first center line C1, and the size thereof is not particularly limited. Moreover, the groove 83 may be a groove portion that allows the lubricant to flow as described above, and, for example, may be configured by bringing together a plurality of holes.

[0102] At least a part of the grooves 83 (grooves 83a, 83b, 83d, 83e) among the plurality of grooves 83 may be formed in a substantially L-shape in a plan view when the opening and closing device 110 is in the closed state.

[0103] At least some of the grooves 83 (grooves 83a, 83b, 83d, 83e) among the plurality of grooves 83 may be formed in a substantially W-shape in a plan view when the opening and closing device 110 is in the closed state.

[0104] In addition, the groove portion 83 is not limited to such a shape, and may be formed in a substantially V-shaped, substantially U-shaped, etc. when viewed from above when the opening and closing device 110 is in the closed state. In addition, a part of the groove portions 83 or all of the groove portions 83 may be formed of groove portions of different shapes, such as, for example, a plurality of groove portions 83 are formed of arc-shaped groove portions and substantially V-shaped groove portions. In addition, it is also possible to set the structure in which the groove portion 83 is provided in the contact area between the surface of the abutment portion 33 and the cam portion 82, instead of the structure provided in the cam portion 82.

Claims

1. An opening and closing device, wherein a rotating part is rotatably provided on a base part, and an opening and closing action is performed by rotating the rotating part relative to the base part, wherein: One of the base portion and the rotating portion partially contacts a surface of the other of the base portion and the rotating portion during the opening and closing operation, and reciprocates relative to the surface in a first direction. A first groove portion for storing lubricant is formed in the part or the surface, The first groove portion has 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 passing through the center of the first direction and along a second direction orthogonal to the first direction as a boundary, in a contact area between the part and the surface. The first groove and the second groove have portions in the contact region that extend so as to be separated from the center in the second direction as they go toward the center in the first direction.

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

3. The opening and closing device according to claim 2, wherein: The plurality of first grooves are formed to be line-symmetrical with respect to the second center line.

4. The opening and closing device according to claim 1 or 2, wherein: The first slot is connected to the second slot, The first grooves are respectively in an arc shape or a bent shape.

5. The opening and closing device according to claim 1 or 2, wherein: 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, the slider portion is movable in a direction approaching the first pressure receiving portion and in a direction away from the first pressure receiving portion, the slider portion is pressed toward the first pressure receiving portion so that the slider portion is in continuous contact with the first pressure receiving portion, The first pressure receiving portion contacts the first surface of the slider portion and reciprocates relative to the first surface along the first direction. The first groove is formed on the first surface.

6. The opening and closing device according to claim 5, wherein: The base portion has the first pressure receiving portion, The rotating part has: A first rotating portion, which is rotatably disposed on the base portion and has the slider portion; as well as a second rotating part rotatably disposed on the first rotating part, The second rotating part has a second pressure receiving part, which contacts a second surface of the slider part located on the opposite side of the first surface in the moving direction of the slider part as the second rotating part rotates, and reciprocates relative to the second surface along a third direction. A plurality of second grooves are formed on the second surface or the second pressure receiving portion, and the plurality of second grooves are arranged along a fourth direction orthogonal to the third direction and are used to accumulate lubricant. The plurality of second grooves respectively include a third groove arranged on one side of the third direction and a fourth groove arranged on the other side of the third direction, with a third center line passing through the center of the third direction and along the fourth direction as a boundary in a contact area between the second surface and the second pressure receiving portion. The third groove and the fourth groove have portions in the contact region that extend so as to become farther away from the center in the fourth direction as they go toward the center in the third direction.

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