Opening / closing device, and electronic apparatus comprising the opening / closing device

Abstract

To provide an opening / closing device in which the noise caused by contact between its members can be suppressed.SOLUTION: A base member comprising lateral plates 12 and a back plate 13 is provided with rotary members in a rotatable manner. The lateral plates 12 have a hole 14. The back plate 13 comprises insertion pieces 15 to be inserted to the holes 14, the insertion pieces projecting from an edge of the rear plate 13. The hole 14 comprises protrusions 16 that project from an inner surface of the hole 14 to an insertion piece side 15, to contact the insertion piece 15.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a technology of an opening / closing device that performs an opening / closing operation by rotating a rotating member with respect to a base member, and an electronic device including the opening / closing device.

Background Art

[0002] Conventionally, in a document pressing plate opening / closing device, one including an attachment member, a support member, a lift member, a pressure receiving member, an operating member, a first spring receiving member, a second spring receiving member, and a compression coil spring is known (see Patent Document 1). The attachment member is attached to the device main body. The support member has an accommodation space formed therein and is rotatably attached to the attachment member via a first hinge shaft. The lift member is rotatably attached to the support member via a second hinge shaft, and the document pressing plate is attached thereto. The pressure receiving member is provided on the attachment member. The operating member is provided on the second hinge shaft side of the lift member. The first spring receiving member abuts against the pressure receiving member and is slidably provided in the accommodation space of the support member. The second spring receiving member abuts against the operating member and is slidably provided in the accommodation space of the support member. The compression coil spring is provided between the second spring receiving member and the first spring receiving member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the original document pressing plate opening / closing device, the side plate of the mounting member is provided with a hole, and the back plate is provided with an insertion piece protruding from the edge of the side plate. By inserting the insertion piece into the hole, the back plate is prevented from falling, thereby maintaining the shape of the mounting member. However, since there is a slight gap between the hole and the insertion piece, when a load is applied to the back plate so as to incline forward or backward, the insertion piece may move slightly so as to incline forward or backward within the hole. When the insertion piece moves within the hole in this way, the corners of the insertion piece and the inner surface of the hole may rub against each other, generating abnormal noise.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide an opening / closing device capable of suppressing abnormal noise generated by contact between members.

Means for Solving the Problems

[0006] The problems to be solved by the present invention are as described above. Next, means for solving these problems will be described.

[0007] That is, in the opening / closing device disclosed in the present application, a rotating member is rotatably provided on a base member, and the opening / closing device performs an opening / closing operation by rotating the rotating member with respect to the base member. The base member includes a side plate and a back plate. The side plate is provided with a hole, and the back plate is configured to protrude from an edge of the back plate and is provided with an insertion piece inserted into the hole. The hole is provided with a convex portion protruding from an inner surface of the hole toward the insertion piece side and contacting the insertion piece.

Effects of the Invention

[0008] As effects of the present invention, the following effects are achieved. That is, according to the present invention, abnormal noise generated by contact between members can be suppressed.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0010] The opening / closing device 100 described in Figs. 1 to 10 will be explained. The opening / closing device 100 is a hinge that connects one member of two members to the other member in an openable / closable manner. A rotating member is rotatably provided on the base member, and the opening / closing operation is performed by the rotation of the rotating member with respect to the base member. The opening / closing device 100 is used, for example, in OA devices such as scanners, fax machines, copiers, or multifunction devices, automobiles, toilet seats, or various electronic devices such as rice cookers. As the opening / closing device 100 connects one member of two members to the other member in an openable / closable manner, for example, there are a door portion rotatably connected to the main body of a printer, an original pressing device rotatably connected to the main body of a multifunction device, a display rotatably connected to a stand, a toilet seat rotatably connected to a toilet seat, a bonnet rotatably connected to the vehicle body of an automobile, etc.

[0011] When the rotating member is closed with respect to the base member, the rotation angle θ of the rotating member is set to 0°, and the rotation angle θ of the rotating member is defined such that θ increases when the rotating member rotates in the opening direction. Also, for convenience, hereinafter, the opening / closing device 100 will be described with reference to the vertical direction, the front-rear direction, and the left-right direction of the opening / closing device 100 when the rotating member is closed with respect to the base member.

[0012] As shown in FIGS. 1 to 6, the opening / closing device 100 includes a lower fixing member 10, an intermediate member 20, an upper fixing member 30, a slide member having a first slider 40 and a second slider 50, a spring member 60, a stopper 61, a damper 62, a first rotating shaft 71, a second rotating shaft 72, a first pressure receiving member 75, and a second pressure receiving member 76. An embodiment of the base member according to the present invention includes the lower fixing member 10, the first rotating shaft 71, and the first pressure receiving member 75. An embodiment of the rotating member according to the present invention includes the intermediate member 20, the upper fixing member 30, the slide member (the first slider 40 and the second slider 50), the spring member 60, the damper 62, the second rotating shaft 72, and the second pressure receiving member 76.

[0013] 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.

[0014] The bottom plate 11 of the lower fixing member 10 is a plate-like member that constitutes the lower part of the lower fixing member 10. The shape of the bottom plate 11 is generally rectangular and slightly longer in the front-rear direction in plan view. The side plates 12·12 of the lower fixing member 10 are plate-like members that constitute the left and right side portions of the lower fixing member 10. The lower end portions of the side plates 12·12 are connected to the end portions of the bottom plate 11. Through holes for inserting the first rotating shaft 71 are opened at the rear upper end portions of the side plates 12·12. Through holes for inserting the first pressure receiving member 75 are opened at the front upper end portions of the side plates 12·12. The back plate 13 of the lower fixing member 10 is a plate-like member that constitutes the rear part of the lower fixing member 10. The shape of the back plate 13 is generally rectangular and slightly longer in the left-right direction in front view. The lower end portion of the back plate 13 is connected to the rear end portion of the bottom plate 11.

[0015] The intermediate member 20 is an embodiment of the first rotating member according to the present invention. The intermediate member 20 is formed by appropriately bending a single metal plate. The intermediate member 20 includes a top plate 21 and left and right side plates 22·22. In the intermediate member 20, the top plate 21 is disposed above the side plates 22·22, and the side plates 22·22 are bent downward from both left and right sides of the top plate 21, so that it is configured in a substantially U-shape when viewed from the front in the closed state of the opening / closing device 100. The intermediate member 20 is configured in a box shape with the lower left and right central portions opened by bending the lower end portions of the side plates 22·22 so as to extend toward the left and right central sides. The intermediate member 20 is rotatably supported by the lower fixing member 10 via the first rotating shaft 71 in a state where the first slider 40, the second slider 50, the spring member 60, the damper 62, etc. are accommodated. Through holes for inserting the first rotating shaft 71 are opened at the rear portions of the side plates 22·22 of the intermediate member 20. Through holes for inserting the second rotating shaft 72 are opened at the front end portions of the side plates 22·22.

[0016] The first rotating shaft 71 is a member having a substantially cylindrical shape. The first rotating shaft 71 is inserted into the through holes at the rear portions of the side plates 22·22 of the intermediate member 20 and the through holes at the upper rear end portions 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 via the first rotating shaft 71.

[0017] The upper fixing member 30 is an embodiment of the second rotating member according to the present invention. The upper fixing member 30 is formed by appropriately bending a single metal plate. The upper fixing member 30 includes a top plate 31 and left and right side plates 32·32. In the upper fixing member 30, the top plate 31 is disposed above the side plates 32·32, and the side plates 32·32 are bent downward from both left and right sides of the top plate 31, so that it is configured in a substantially U-shape when viewed from the front in the closed state of the opening / closing device 100. 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 member of the two members. Through holes for inserting the second rotating shaft 72 are opened at the upper front end portions of the side plates 32·32. Through holes for attaching the second pressure receiving member 76 are opened at the lower front end portions of the side plates 32·32.

[0018] The second rotating shaft 72 is a member generally in a cylindrical shape. The second rotating 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 parts of the side plates 12, 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.

[0019] The first pressure receiving member 75 is made of a metal material and is configured in a pin shape. The first pressure receiving member 75 is inserted into the through hole at the front upper end of the side plates 12, 12 and fixed to the lower fixing member 10 in front of the first rotating shaft 71. The surface of the first pressure receiving member 75 on the side of the first slider 40 is formed as a curved surface and contacts the first cam portion 41 of the first slider 40. Note that the first pressure receiving member 75 is not limited to a pin shape and can be configured in other ways such as in a block shape or by bending a plate-shaped member.

[0020] The second pressure receiving member 76 is an embodiment of the pressure receiving member according to the present invention. The second pressure receiving member 76 is configured in a pin shape. The second pressure receiving member 76 is inserted into the through hole at the front lower end of the side plates 32, 32 and fixed to the upper fixing member 30. The surface of the second pressure receiving member 76 on the side of the second slider 50 contacts the second cam portion 51 of the second slider 50. Note that the second pressure receiving member 76 is not limited to a pin shape and can be configured in other ways such as 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 includes an opening 42 that opens forward at the front portion and a bottom portion at the rear portion, and is configured in a bottomed cylindrical shape. The first slider 40 includes a first cam portion 41 on the rear surface of the bottom portion. The first slider 40 is configured to contact the first pressure receiving member 75 on the rear surface of the first cam portion 41. A spring receiving hole for accommodating the rear end portion of the spring member 60 is formed in the first slider 40. The first slider 40 is slidably accommodated in the rear portion inside the intermediate member 20 in the front-rear direction. The first slider 40 is movable in a direction approaching and separating from the first pressure receiving member 75 and is pressed toward the first pressure receiving member 75 so that the first cam portion 41 contacts the first pressure receiving member 75. A lubricant such as grease is applied to the contact portion between the first cam portion 41 and the first pressure receiving member 75 to suppress wear.

[0022] The second slider 50 is made of a resin material. The second slider 50 includes an opening 52 that opens rearward at the rear portion and a bottom portion at the front portion, and is configured in a bottomed cylindrical shape. The second slider 50 includes a second cam portion 51 on the front surface of the bottom portion. The second slider 50 is configured to contact the second pressure receiving member 76 at the second cam portion 51. A spring receiving hole for accommodating the front end portion of the spring member 60 is formed in the second slider 50. The second slider 50 is slidably accommodated in the rear portion inside the intermediate member 20 in the front-rear direction. The second slider 50 is movable in a direction approaching and separating from the second pressure receiving member 76 and is pressed toward the second pressure receiving member 76 so that the second cam portion 51 contacts the second pressure receiving member 76. A lubricant is applied to the contact portion between the second cam portion 51 and the second pressure receiving member 76 to suppress wear.

[0023] The state in which the rotating member is closest to the base member is defined as the "closed state" of the rotating member. The closed state refers to the state where the rotation angle θ from the closed state of the rotating member with respect to the base member is 0° (see FIGS. 1 to 2). Further, the state in which the rotating member is separated from the base member is defined as the "open state" of the rotating member. The open state refers to the state where the rotation angle θ satisfies the relationship 0° < θ < 60° (see FIGS. 3 to 4). Note that the closed state of the rotating member is not limited to the rotation angle θ being 0°, and the open state of the rotating member is not limited to the rotation angle θ satisfying the relationship 0° < θ < 60°. Regarding the rotation angle θ of the closed state of the rotating member or the rotation angle θ of the open state of the rotating member, it can be appropriately set to other angles according to specifications, applications, etc.

[0024] As shown in FIGS. 5 to 6, a lift state can be set in which the intermediate member 20 is open with respect to the lower fixing member 10 and the upper fixing member 30 is open with respect to the intermediate member 20.

[0025] The spring member 60 is composed of a metal coil spring. The spring member 60 is housed in the spring receiving holes 43 and 53 of the first slider 40 and the second slider 50 inside the intermediate member 20. The rear end portion of the spring member 60 is inserted into the spring receiving hole 43 formed in the first slider 40 and contacts the bottom surface of the spring receiving hole 43. Further, the front end portion of the spring member 60 is inserted into the spring receiving hole 53 formed in the second slider 50 and contacts the bottom surface of the spring receiving hole 53.

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

[0027] The stopper 61 is a metal member having a substantially rectangular shape when viewed from the rear, and is fixed to the back plate 13 of the lower fixing member 10 by screws or the like. The stopper 61 is disposed on the rear surface of the back plate 13 of the lower fixing member 10. The upper end of the stopper 61 is located above the upper end of the back plate 13 of the lower fixing member 10. The stopper 61 restricts the rotation of the upper fixing member 30 in the opening direction by the upper end portion of the stopper 61 coming into contact with the top plate 31 of the upper fixing member 30 rotated in the opening direction. The stopper 61 is set such that the upper end portion of the stopper 61 comes into contact with the upper fixing member 30 when the rotation angle θ of the rotating member is 60°. Note that, even without providing the stopper 61, a configuration may be adopted in which the back plate 13 of the lower fixing member 10 comes into contact with the upper fixing member 30 rotated in the opening direction to restrict the rotation of the upper fixing member 30 in the opening direction.

[0028] The damper 62 is housed in the spring receiving holes of the first slider 40 and the second slider 50. The main body portion of the damper 62 is fixed to the bottom of the first slider 40, and its tip portion protrudes toward the second rotation shaft 72 side. The damper 62 generates a reaction force when the tip portion is pressed by the bottom of the second slider 50. For this reason, the reaction force reduces the speed at which the first slider 40 and the second slider 50 move, and a buffering effect by the damper 62 is generated. The damper 62 is constituted by a general fluid damper.

[0029] When the rotating member is in the closed state, the first cam portion 41 of the first slider 40 comes into contact with the first pressure receiving member 75, and the second cam portion 51 of the second slider 50 comes into contact with the second pressure receiving member 76. In such a state, the first slider 40 is pressed by the elastic force of the spring member 60, and the intermediate member 20 is pressed so as to rotate in the opening direction with respect to the lower fixing member 10. Also, the second slider 50 is pressed by the elastic force of the spring member 60, and the upper fixing member 30 is pressed so as to rotate in the closing direction with respect to the intermediate member 20. At this time, the tip portion of the damper 62 is pressed by the bottom of the second slider 50 and is pushed into the main body portion side of the damper 62.

[0030] Also, even when the rotating member is in the open state, the first cam portion 41 of the first slider 40 contacts the first pressure receiving member 75, and the second cam portion 51 of the second slider 50 contacts the second pressure receiving member 76. In such a state, the first slider 40 is pressed by the elastic force of the spring member 60, and the intermediate member 20 is pressed to rotate in the opening direction with respect to the lower fixing member 10. Also, the second slider 50 is pressed by the elastic force of the spring member 60, and the upper fixing member 30 is pressed to rotate in the closing direction with respect to the intermediate member 20.

[0031] That is, regardless of the rotation angle θ of the rotating member, the first slider 40 is pressed toward the first pressure receiving member 75 so that the first cam portion 41 continuously contacts the first pressure receiving member 75 in both the closed state and the open state of the rotating member. In both the closed state and the open state of the rotating member, the first cam portion 41 of the first slider 40 contacts the first pressure receiving member 75, and the second cam portion 51 of the second slider 50 contacts the second pressure receiving member 76. Due to the elastic force of the spring member 60, the intermediate member 20 is pressed to rotate in the opening direction with respect to the lower fixing member 10, and the upper fixing member 30 is pressed to rotate in the closing direction with respect to the intermediate member 20.

[0032] When the rotating member is in the lifted state where the intermediate member 20 is open with respect to the lower fixing member 10 and the upper fixing member 30 is open with respect to the intermediate member 20, the first cam portion 41 of the first slider 40 contacts the first pressure receiving member 75, and the second cam portion 51 of the second slider 50 contacts the second pressure receiving member 76. In such a state, the first slider 40 is pressed by the elastic force of the spring member 60, and the intermediate member 20 is pressed to rotate in the opening direction with respect to the lower fixing member 10. Also, the second slider 50 is pressed by the elastic force of the spring member 60, and the upper fixing member 30 is pressed to rotate in the opening direction with respect to the intermediate member 20. At this time, the tip of the damper 62 is pressed by the bottom of the second slider 50 and is pushed into the main body side of the damper 62.

[0033] As shown in FIG. 1 or FIG. 7, the side plate 12 of the lower fixing member is provided with a hole 14, and the back plate 13 is provided with left and right insertion pieces 15. The hole 14 is a through hole having a longitudinal direction in the vertical direction. The insertion piece 15 is inserted into the hole 14. The hole 14 is formed below the through hole for inserting the first pivot shaft 71 and behind the through hole for inserting the first pressure receiving member 75. The insertion piece 15 is configured to protrude laterally from the edge of the middle part in the vertical direction of the side plate 12. The insertion piece 15 is inserted into the hole 14. The insertion piece 15 is configured in a substantially rectangular shape having a longitudinal direction in the vertical direction when viewed from the back. The length of the insertion piece 15 in the thickness direction is slightly shorter than the length of the hole 14 in the short side direction. When the insertion piece 15 is inserted into the hole 14, the back plate 13 is prevented from falling forward or backward, and the shape of the lower fixing member 10 is maintained.

[0034] The hole 14 is provided with three (a plurality of) convex portions 16·16·16. The convex portion 16 protrudes from the inner surface of the hole 14 toward the insertion piece 15 disposed in the hole 14, and the protruding side end portion of the hole 14 contacts the front surface and the rear surface of the insertion piece 15. One of the three convex portions 16·16·16 is disposed at substantially the center in the vertical direction on the front surface of the hole 14, and the two convex portions 16·16 are respectively disposed above and below on the rear surface of the hole 14, and the plurality of convex portions 16·16·16 are disposed so as to sandwich the insertion piece 15 before and after.

[0035] As described above, since the convex portion 16 of the hole 14 of the side plate 12 in the lower fixing member 10 protrudes from the inner surface of the hole 14 toward the insertion piece 15 of the back plate 13 and contacts the insertion piece 15, even when a load is applied to the back plate 13 so as to incline forward or backward, the movement of the insertion piece 15 in the hole 14 is restricted by the convex portion 16. For example, when the stopper 61 contacts the top plate 31 of the upper fixing member 30 rotated in the opening direction and a load is applied to the back plate 13 of the lower fixing member 10 so as to incline backward, the movement of the insertion piece 15 in the hole 14 is restricted by the convex portion 16. Therefore, it is possible to prevent the insertion piece 15 and the inner surface of the hole 14 from rubbing against each other and generating abnormal noise when a load is applied to the back plate 13 of the lower fixing member 10. In this way, the abnormal noise generated by the contact between the members is suppressed. Also, as described above, since the plurality of convex portions 16·16·16 are arranged so as to sandwich the insertion piece 15 before and after, even when a load is applied to the back plate 13 so as to incline in either the front or the rear direction, the forward and backward movement within the hole portion 14 of the insertion piece 15 will be restricted by the convex portions 16. Therefore, unlike the case where the convex portions 16 are arranged only in the front or only in the rear, it is possible to prevent the insertion piece 15 and the inner surface of the hole portion 14 from rubbing against each other and generating abnormal noise even when a load is applied to the back plate 13 of the lower fixing member 10 in either the front or the rear direction. Also, as described above, since one of the three convex portions 16·16·16 is arranged at approximately the center of the upper and lower portions on the front surface of the hole portion 14, and the two convex portions 16·16 are respectively arranged above and below the rear surface of the hole portion 14, for example, compared to a configuration in which the insertion piece 15 is sandwiched before and after by two convex portions 16, the contact points between the convex portions 16 and the insertion piece 15 can be increased. For this reason, even when a load is applied to the back plate 13 so as to incline in the front and rear directions, the movement of the insertion piece 15 within the hole portion 14 will be more reliably restricted by the convex portions 16. Therefore, it is possible to prevent the insertion piece 15 and the inner surface of the hole portion 14 from rubbing against each other and generating abnormal noise when a load is applied to the back plate 13 of the lower fixing member 10.

[0036] As the intermediate member 20 rotates in the closing direction with respect to the lower fixing member 10 and the upper fixing member 30 rotates in the opening direction with respect to the intermediate member 20, the first slider 40 and the second slider 50 move so as to approach each other relatively. And as the first slider 40 and the second slider 50 move so as to approach each other in this way, the spring member 60 contracts in the axial direction of the spring member 60 while expanding outward in a direction orthogonal to the axial direction of the spring member 60. As shown in FIGS. 2, 4, 6, or 8, the first slider 40 includes a tapered surface 44. The tapered surface 44 is configured to flare out as it goes toward the opening 42 side. The tapered surface 44 constitutes at least a part of the peripheral surface of the spring receiving hole 43. The tapered surface 44 is configured to widen the space of the spring receiving hole 43 so that the spring member 60 does not contact the spring member 60 that bulges outward. The tapered surface 44 is formed at the portion closest to the opening 42 on the peripheral surface of the spring receiving hole 43. Note that the tapered surface 44 may be configured such that the entire peripheral surface of the spring receiving hole 43 flares out as it goes toward the opening 42 side, or the middle portion in the axial direction of the spring receiving hole 43 may be configured to flare out as it goes toward the opening 42 side.

[0037] As described above, since the peripheral surface of the spring receiving hole 43 of the first slider 40 has the tapered surface 44 that flares out as it goes toward the opening 42 side, the space in the spring receiving hole 43 can be configured to be wider than that of a structure without the tapered surface 44. Therefore, when the intermediate member 20 rotates in the closing direction with respect to the lower fixing member 10 and the upper fixing member 30 rotates in the opening direction with respect to the intermediate member 20, and the first slider 40 and the second slider 50 move closer to each other so that the spring member 60 contracts and bulges outward, it is possible to suppress the spring member 60 from contacting the peripheral surface of the spring receiving hole 43 of the first slider 40. Accordingly, when the intermediate member 20 rotates with respect to the lower fixing member 10 and the upper fixing member 30 rotates with respect to the intermediate member 20, it is possible to prevent abnormal noise from being generated due to the spring member 60 contacting the spring receiving hole 43 of the first slider 40. In this way, abnormal noise generated by contact between members is suppressed. Further, since the tapered surface 44 of the first slider 40 is configured to flare out as it goes toward the opening 42 side, when the first slider 40 moves and the spring member 60 contracts and bulges outward, the spring member 60 will come into contact with and slide along the tapered surface 44. Therefore, when the intermediate member 20 rotates with respect to the lower fixing member 10 and the upper fixing member 30 rotates with respect to the intermediate member 20, it is possible to reduce the generation of abnormal noise caused by the spring member 60 coming into contact with the spring receiving hole 43 of the first slider 40.

[0038] As shown in FIGS. 2, 4, 6, or 9, the second slider 50 is provided with a tapered surface 54. The tapered surface 54 is configured to flare out as it goes toward the opening 52 side (rearward). The tapered surface 54 constitutes at least a part of the circumferential surface of the spring receiving hole 53 and forms a wide space for the spring receiving hole 53. The tapered surface 54 is formed at the portion closest to the opening 52 on the circumferential surface of the spring receiving hole 53.

[0039] As described above, since at least a part of the circumferential surface of the spring receiving hole 53 of the second slider 50 is provided with the tapered surface 54 that flares out as it goes toward the opening 52 side, the space inside the spring receiving hole 53 can be configured wider than that of a structure without the tapered surface 54. For this reason, when the intermediate member 20 rotates with respect to the lower fixing member 10 and the upper fixing member 30 rotates with respect to the intermediate member 20 and the second slider 50 moves, causing the spring member 60 to contract and bulge outward, it is possible to suppress the spring member 60 from coming into contact with the circumferential surface of the spring receiving hole 53 of the second slider 50. Therefore, when the intermediate member 20 rotates with respect to the lower fixing member 10 and the upper fixing member 30 rotates with respect to the intermediate member 20, it is possible to prevent the generation of abnormal noise caused by the spring member 60 coming into contact with the spring receiving hole 53 of the second slider 50. Further, since the tapered surface 54 of the second slider 50 is configured to flare out toward the opening 52 side, when the first slider 40 moves and the spring member 60 contracts and bulges outward, the spring member 60 comes into contact with the tapered surface 54 so as to slide thereon. Therefore, when the intermediate member 20 rotates with respect to the lower fixing member 10 and the upper fixing member 30 rotates with respect to the intermediate member 20, it is possible to reduce the generation of abnormal noise when the spring member 60 comes into contact with the spring receiving hole 53 of the second slider 50.

[0040] As shown in FIGS. 2, 4, or 6, the first cam portion 41 is formed in a substantially V shape in a side view and is configured to project from the bottom toward the first pressure receiving member 75 side. The first cam portion 41 has a top portion, and the top portion is formed at an intermediate portion in the vertical direction of the first cam portion 41. As the intermediate member 20 rotates in the opening and closing directions with respect to the lower fixing member 10 and the first slider 40 is pressed by the spring member 60, the portion of the first cam portion 41 where the first pressure receiving member 75 contacts changes along a direction orthogonal to the axial direction of the first rotation shaft 71. When the rotating member is in the closed state, the first pressure receiving member 75 contacts a portion closer to the first rotation shaft 71 side than the top portion of the first cam portion 41. When the rotating member changes from the closed state to the open state and the rotation angle of the intermediate member 20 with respect to the lower fixing member 10 becomes a predetermined angle or more, the first pressure receiving member 75 overrides the top portion of the first cam portion 41 and contacts a portion on the side opposite to the first rotation shaft 71 side of the top portion of the first cam portion 41 of the first slider 40. Thus, when the intermediate member 20 rotates in the opening and closing directions with respect to the lower fixing member 10, with the state where the rotation angle of the intermediate member 20 with respect to the lower fixing member 10 becomes a predetermined angle as a boundary, the first pressure receiving member 75 overrides the top portion of the first cam portion 41. When the first pressure-receiving member 75 is in contact with the portion on the first rotation axis 71 side rather than the top of the first cam portion 41, the first slider 40 tends to fall to the side opposite to the top plate 21 side of the intermediate member 20 with the contacting portion of the first cam portion 41 and the first pressure-receiving member 75 as a fulcrum. When the first pressure-receiving member 75 is in contact with the portion on the side opposite to the first rotation axis 71 side rather than the top of the first cam portion 41, the first slider 40 tends to fall to the top plate 21 side of the intermediate member 20 with the contacting portion of the first cam portion 41 and the first pressure-receiving member 75 as a fulcrum. In this way, when the intermediate member 20 rotates in the opening and closing directions with respect to the lower fixing member 10 and the first pressure-receiving member 75 gets over the top of the first cam portion 41, the direction in which the first slider 40 tends to fall is reversed. And when the direction in which the first slider 40 tends to fall is reversed, abnormal noise may occur due to the contact between the outer surface of the first slider 40 and the inner surface of the intermediate member 20.

[0041] As shown in FIG. 8 or FIG. 10, the first slider 40 includes two (a plurality of) protruding portions 45. The protruding portions 45 protrude in a direction away from the first pressure-receiving member 75 from the end portion on the opening 42 side of the first slider 40. The protruding portions 45 protrude toward the second slider 50 from the end portion on the second slider 50 side of the first slider 40. The protruding portions 45 are configured in a plate shape and provided on the outer surface of the boundary portion between the side surface and the upper surface of the first slider 40. The protruding portions 45 contact the inner surface of the intermediate member 20 along the moving direction of the first slider 40 when the first slider 40 moves inside the intermediate member 20 along with the opening and closing operation of the rotating member. Note that the number and arrangement positions of the protruding portions 45 are not limited to such a configuration, and can be appropriately configured according to specifications and the like.

[0042] As described above, the protruding portion 45 of the first slider 40 protrudes in a direction away from the first pressure receiving member 75, and when the first slider 40 moves within the intermediate member 20 along with the opening and closing operation of the rotating member, it contacts the inner surface of the intermediate member 20 along the moving direction of the first slider 40. In this way, by the protruding portion 45 of the first slider 40, when the first slider 40 moves within the intermediate member 20 along with the opening and closing operation of the rotating member, the portion of the first slider 40 that is in contact with the inner surface of the intermediate member 20 can be extended along the moving direction of the first slider 40. Therefore, when the first pressure receiving member 75 crosses over the top of the first cam portion 41, the range of the angle at which the first slider 40 tends to fall with the contact portion between the first cam portion 41 and the first pressure receiving member 75 as the fulcrum can be narrowed. Thus, when the direction in which the first slider 40 tends to fall reverses, it is possible to reduce the occurrence of abnormal noise due to the contact between the outer surface of the first slider 40 and the inner surface of the intermediate member 20. In this way, abnormal noise generated by the contact between members is suppressed.

[0043] As shown in FIG. 9 or FIG. 15, the second slider 50 includes two (a plurality of) recesses 55·55. The recess 55 is configured such that the upper end portion of the second slider 50 is formed in a concave shape along the moving direction of the second slider 50. The recess 55 is formed at the end portion of the second slider 50 on the side of the first slider 40. The recess 55 is provided on the outer surface of the boundary portion between the side surface and the upper surface of the second slider 50. The recess 55 is configured in a shape corresponding to the protruding portion 45 of the first slider 40, and is configured such that the protruding portion 45 of the first slider 40 can be arranged in a state where the first slider 40 and the second slider 50 move and approach each other along with the opening and closing operation of the rotating member. Note that the number and arrangement positions of the recesses 55 are not limited to such a configuration, and can be appropriately configured according to specifications and the like.

[0044] As described above, the concave portion 55 of the second slider 50 is configured such that the protruding portion 45 of the first slider 40 can be disposed in a state where the first slider 40 and the second slider 50 are moved close to each other. Therefore, the intermediate member 20 can be configured such that the first slider 40 includes the protruding portion 45 without being configured to be long in the moving direction side of the slider portions of the first slider 40 and the second slider 50. Accordingly, the opening / closing device 100 can be configured such that the first slider 40 includes the protruding portion 45 without increasing in size.

[0045] Note that the opening / closing device 100 may be configured such that the first rotating shaft 71 is directly provided on a connection target such as the main body of an OA device without including the lower fixing member 10, and the intermediate member 20 is rotatably provided on the connection target such as the main body of the OA device via the first rotating shaft 71. Further, the opening / closing device 100 may be configured such that the second rotating shaft 72 is directly provided on a connection target such as a document pressing device of an OA device without including the upper fixing member 30, and the connection target such as the document pressing device of the OA device is rotatably provided on the intermediate member via the second rotating shaft 72.

Explanation of Reference Numerals

[0046] 10 Lower fixing member 11 Bottom plate 12 Side plate 13 Back plate 14 Hole portion 15 Insertion piece 16 Protrusion 20 Intermediate member 30 Upper fixing member 40 First slider 41 First cam portion 42 Opening 43 Spring receiving hole 44 Tapered surface 45 Protruding portion 50 Second slider 51 Second cam portion 52 Opening 53 Spring receiving hole 54 Tapered surface 55 Protruding portion 60 Spring member 71 First rotating shaft 72 Second rotating shaft 75 First pressure-receiving member 76 Second pressure-receiving member 100 Opening / closing device

Claims

1. An opening and closing device in which a rotating member is rotatably provided on a base member, and the rotating member rotates with respect to the base member to perform an opening and closing operation, The base member includes a side plate and a back plate, The side plate includes a hole portion, The back plate includes an insertion piece configured to protrude from an edge portion of the back plate and be inserted into the hole portion, The hole portion includes a convex portion that protrudes from an inner surface of the hole portion toward the insertion piece side and contacts the insertion piece, An opening and closing device.

2. An opening and closing device in which a rotating member is rotatably provided on a base member, and the rotating member rotates with respect to the base member to perform an opening and closing operation, It includes a spring member, a pressure receiving member, and a slide member, By the slide member pressed toward the pressure receiving member side by the elastic force of the spring member, the rotating member is pressed to rotate in an opening direction with respect to the base member, The spring member is a coil spring, The slide member is configured in a bottomed cylindrical shape having an opening portion and a bottom portion, A spring receiving hole for accommodating the spring member is formed inside the slide member, The peripheral surface of the spring receiving hole has a tapered surface that widens toward the opening portion side, An opening and closing device.

3. An opening and closing device in which a rotating member is rotatably provided on a base member via a rotation axis, and the rotating member rotates with respect to the base member to perform an opening and closing operation, The base member includes a pressure receiving member, The rotating member includes a slide member movable in a direction approaching and separating from the pressure receiving member, The slide member includes a cam portion that contacts the pressure receiving member, and the cam portion is pressed toward the pressure receiving member side so as to continuously contact the pressure receiving member, As the rotating member rotates in the opening and closing directions with respect to the base member, the portion of the cam portion that contacts the pressure receiving member changes along a direction orthogonal to the axial direction of the rotation axis. The cam portion has a top portion. When the rotating member rotates in the opening and closing directions with respect to the base member, the pressure receiving member gets over the top portion of the cam portion with the rotation angle of the rotating member with respect to the base member reaching a predetermined angle as a boundary. The slide member is configured in a bottomed cylindrical shape having an opening and a bottom, and includes a protruding portion that protrudes from an end portion on the opening side in a direction away from the pressure receiving member. The protruding portion contacts the rotating member along the moving direction of the slide member when the slide member moves inside the rotating member during the opening and closing operation. An opening and closing device.

4. The rotating member includes a first rotating member rotatably provided on the base member, and a second rotating member rotatably provided on the first rotating member. The pressure receiving member includes a first pressure receiving member provided on the base member, and a second pressure receiving member provided on the second rotating member. The slide member includes a first slider supported by the first rotating member and movable in the first rotating member in directions approaching and separating from the first pressure receiving member and pressed toward the first pressure receiving member so as to contact the first pressure receiving member, and a second slider supported by the first rotating member and movable in the first rotating member in directions approaching and separating from the second pressure receiving member and pressed toward the second pressure receiving member so as to contact the second pressure receiving member. The first slider includes the protruding portion. The protruding portion protrudes from an end portion of the first slider on the second slider side toward the second slider side, and contacts the rotating member along the moving direction of the first slider when the first slider moves inside the first rotating member during the opening and closing operation. The second slider includes a recess at an end of the second slider on the first slider side, The recess is configured to be able to dispose the protruding portion in a state where the first slider and the second slider are close to each other, The opening / closing device according to claim 3.

5. An electronic device including the opening / closing device according to any one of claims 1 to 4.

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