JP3118202U - Opening / closing hinge - Google Patents

Abstract

An opening / closing hinge for an opening / closing body capable of easily adjusting a spring pressure in order to cope with a decrease in spring pressure of a spring member over time and a user-friendly demand.
A cam member 8 having a cam surface 7 provided on the toilet seat 1 side, and a cylindrical leg 11 pivotally connected to the cam member about a hinge shaft 10 and attached to the toilet 3 side. A cam follower 13 having a protrusion 12 slidably contacted with the cam surface 7 and housed in the cylindrical leg portion 11 is slidably accommodated in the cylindrical leg portion, and the cam follower 13 is always attached to the cam surface 7. And a spring pressure adjusting means 24 that can adjust the spring pressure of the spring member 14. The spring pressure adjusting means 24 is formed by screwing and attaching a bottom lid 26 having a spring receiving surface 26 a for receiving the end of the spring member 14 to close the bottom opening 25 at the bottom of the cylindrical leg 1.
[Selection] Figure 11

Description

  The present invention relates to an opening / closing hinge suitably used for opening / closing an opening / closing body such as a toilet seat / toilet lid of a Western-style toilet, a notebook computer, and a small measuring instrument.

  For example, as the hinge for opening and closing the toilet seat and toilet lid of a Western-style toilet, the same applicant previously proposed the following hinge (see Patent Document 1). There, a cam member having a cam surface provided on a pivot base end side of a toilet seat or a toilet lid, and a cylindrical leg pivotally connected to the cam member so as to be pivotable about a hinge axis and attached to the western toilet bowl side. And a cam follower having a protrusion slidably contacted with the cam surface and housed in the cylindrical leg, the cam follower always facing the cam surface. A spring member that presses and urges the spring, and the cam member, the cam follower, and the spring member generate a torque that repels the torque in the rotational direction toward the closed position of the toilet seat or the toilet lid. The toilet seat or toilet lid is stopped and held at a predetermined rotation angle position.

  According to such an opening / closing hinge, the cam member, the cam follower, and the spring member generate a torque that repels the torque in the rotational direction of the toilet seat or the toilet lid to the closed posture, so that the toilet seat or the toilet lid is brought into the closed posture. The impact at the time of reaching can be mitigated, the occurrence of a collision sound can be prevented, and the operation force required to lift and open the toilet seat and toilet lid by hand can be reduced. Therefore, particularly when applied to a toilet for nursing care, there is an advantage that it is extremely safe and convenient for the care recipient.

Utility Model Registration No. 311640

  However, in the open / close hinge as described above, since the spring pressure of the spring member acting on the cam follower is initially set to a constant pressure, it is too strong or too weak depending on the abnormality or obstacle of the user's body. However, there was a disadvantage that the spring pressure could not be adjusted. In addition, there is a problem that the spring pressure is lowered due to fatigue of the spring member over time.

  An object of the present invention is to solve such a problem, and an opening / closing body that can easily adjust the spring pressure in order to cope with a decrease in the spring pressure of the spring member over time and a user-friendly request. An object is to provide a hinge for opening and closing.

  The present invention provides a cam member having a cam surface provided on one of the first member and the second member that rotate relative to each other, and a cam member that is rotatable about a hinge axis. A cylindrical leg portion that is pivotally connected and is attached to the other member side of the first member and the second member, and is accommodated in the cylindrical leg portion so as to be slidable in the vertical direction. A cam follower having a projecting slidable contact, and a spring member housed in the cylindrical leg portion and constantly pressing and urging the cam follower toward the cam surface, the cam member, the cam follower and the spring member A torque repelling the torque in the rotational direction to the closed posture of the first member or the second member is generated, and the first member or the second member is brought to a predetermined rotational angle position by the balance. Opening and closing of the opening / closing body designed to stop and hold In the hinge, and it has the characteristics in that it comprises a spring pressure adjusting means capable of adjusting the spring pressure of the spring member.

  As one preferred embodiment, the hinge for opening and closing according to the present invention has a bottom opening formed at the bottom of the cylindrical leg as the spring pressure adjusting means, and the spring member at the bottom of the cylindrical leg. The bottom cover formed on the inner surface with a spring receiving surface for receiving the end of the screw is screwed and attached so as to close the bottom opening. In this case, a recess for hanging the tool can be provided on the outer surface of the bottom lid. The cylindrical leg may be formed of a plastic material and the bottom cover may be formed of a metal material.

According to the opening / closing hinge configured as described above, the cam member, the cam follower, and the spring member generate the torque that repels the torque in the rotation direction to the closed position of the first member or the second member, The impact when the member or the second member reaches the closed position can be mitigated, the occurrence of collision noise can be prevented, and the operating force required to lift and open the first member or the second member by hand Can be reduced. Therefore, especially when applied to a toilet for nursing care, it is extremely safe and convenient for the care recipient.
Particularly, since the spring pressure of the spring member acting on the cam follower can be adjusted by the spring pressure adjusting means, the opening / closing force and opening / closing speed of the first member or the second member can be freely changed according to the user's preference. There is also an advantage that when the spring pressure decreases with time, the spring pressure can be increased by the spring pressure adjusting means.

  A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a Western-style toilet showing the toilet seat and toilet cover fully opened by an opening / closing hinge according to an embodiment of the present invention, and FIG. 2 is a side view of the Western-style toilet showing the toilet seat and toilet lid being fully closed, 3 is a partially broken plan view of a Western-style toilet showing the toilet seat and the toilet lid in a fully closed state, FIG. 4 is a rear view of the Western toilet showing the toilet seat and the toilet lid in a fully-closed state, and FIG. 5 is a plan view of the Western toilet. 6 is a plan view of the toilet seat, FIG. 7 is a rear view of the toilet seat, FIG. 8 is a plan view of the toilet lid, FIG. 9 is a rear view of the toilet lid, and FIG. 10 is an open / close state showing the fully opened state of the toilet lid and toilet seat. FIG. 11 is a longitudinal side view of the hinge for opening and closing showing the fully closed state of the toilet lid and toilet seat, FIG. 12 is a longitudinal side view of the hinge for opening and closing showing the fully opened state of the toilet lid and toilet seat, and FIG. It is a vertical side view of the hinge for opening and closing which shows the fully closed state of a toilet lid and a toilet seat.

  The hinge for opening and closing according to an embodiment of the present invention has a toilet seat 1 and a toilet lid 2 as second members with respect to the upper surface of a western-style toilet (hereinafter referred to as “toilet”) 3 constituting the first member. As shown in FIG. 1, it opens and closes in a vertical or near-vertical position, and as shown in FIGS. It is a thing.

  As shown in FIG. 5, the toilet bowl 3 has a pair of left and right square mounting holes 4 and 4 for attaching the toilet lid 2 to the rear part of the upper surface thereof, and a square mounting section for mounting the toilet seat 1. The hole 5 is recessed in the center between the mounting holes 4 and 4 and at a position slightly deviated forward.

As shown in FIGS. 6 and 7, the valve seat 1 is formed in a horseshoe shape having an opening 1 a in a plan view having a size capable of covering the upper surface of the toilet bowl 3. An opening / closing hinge 6 corresponding to the mounting hole 5 in the center of the toilet 3 is provided on the rear proximal end side of the toilet seat 1.
As shown in FIG. 10, the opening / closing hinge 6 has a cam member 8 having a cam surface 7 provided in a hanging manner on the rear proximal end side of the toilet seat 1, and opposing wall portions 9, 9 at the upper end. A cylindrical leg 11 having a quadrangular cross section in which a cam member 8 is pivotally connected between the opposing wall parts 9 and 9 so as to be rotatable around a hinge shaft 10 and slides in the vertical direction within the cylindrical leg 11. A cam follower (slider) 13 having a quadrilateral cross-section having a protrusion 12 slidably contacting the cam surface 7 of the cam member 8 at the upper end and a cam follower 13 in the cylindrical leg 11 is housed below the cam follower. 13 is provided with a spring member 14 such as a compression coil spring that constantly presses and biases 13 toward the cam surface 7 of the cam member 8, and a spring pressure adjusting means 24 that can adjust the spring pressure of the spring member 14. The cam member 8, the cylindrical leg portion 11, the cam follower 13, and the like are resin molded products that can be washed in the same manner as the resin toilet seat 1.

  The cam surface 7 of the cam member 8 has a first curved edge 7a drawn in a gentle curve about the axis of the hinge shaft 10 and a first curved edge continuous to the rear end of the first curved edge 7a. And a second curved edge 7b drawn with a curvature larger than the curvature of 7a. The spring member 14 has a strength that gives a moment in the toilet seat opening direction to the toilet seat 1 including the cam member 8 against the moment in the closing direction due to the weight of the toilet seat 1 as will be apparent from the description below. The

  The toilet seat 1 is detachably attached to the toilet bowl 3 together with the opening / closing hinge 6 by inserting the cylindrical leg portion 11 of the toilet seat hinge 6 into the attachment hole 5 in the center of the toilet bowl 3 in a removable manner. Thereby, the valve seat 1 together with the opening / closing hinge 6 can be easily cleaned by washing or the like.

  As shown in FIG. 10, the spring pressure adjusting means 24 forms a bottom opening 25 at the bottom of the cylindrical leg 11, and receives a lower end of the spring member 14 at the bottom of the cylindrical leg 11. A bottom lid 26 having a surface 26 a formed on the inner surface is screwed and attached so as to close the bottom opening 25. In the illustrated example, a female screw 27 is provided on the inner periphery of the bottom opening 25, and a male screw 26 b provided on the outer periphery of the bottom lid 26 is screwed into the female screw 27 to attach the bottom cover 26 to the bottom of the cylindrical leg 11. On the other hand, although not shown, a male screw is provided on the outer periphery of the bottom of the cylindrical leg 11 and a female screw provided on the inner periphery of the bottom lid 26 is screwed into the male screw, whereby the bottom lid 26 is attached to the cylindrical leg. It can also be attached to the bottom of the part 11.

  A concave portion 28 for hanging a tool such as a hexagon wrench is provided on the outer surface of the bottom lid 26, and a tool such as a hexagon wrench is hung on the concave portion 28 so that the bottom lid 26 can be easily rotated in the opening and closing direction. The bottom cover 26 is formed of a metal material so that it can sufficiently withstand the load of the spring member 14, while the cylindrical leg portion 11 that does not directly receive the load of the spring member 14 is formed of a plastic material. As a result, the entire opening / closing hinge 6 can be reduced in weight and size as much as possible.

Next, the operation of the opening / closing hinge 6 having the above-described configuration will be described with reference to FIGS.
FIG. 10 shows a fully open state in which the toilet seat 1 slightly exceeds the opening angle of 90 degrees and thereafter tilts slightly backward due to the weight of the toilet seat 1 (see FIG. 1). In this fully open posture, the second curved edge 7b of the cam member 8 is separated from the protrusion 12 of the cam follower 13 to the rear, and the spring member 14 is extended, whereby the fully open posture of the toilet seat 1 is maintained.

  When the toilet seat 1 is rotated about the hinge shaft 10 in the closing direction from this fully open posture, first, the second curved edge 7b of the cam member 8 contacts the protrusion 12 of the cam follower 13 and presses the protrusion 12. As a result, the cam follower 13 is pushed down while contracting the spring member 14, and then the continuous portion of the second curved edge 7 b and the first curved edge 7 a, and the first curved edge 7 a uses the cam follower 13 as a force of the spring member 14. At this time, torque that repels the torque in the direction of rotation of the toilet seat 1 toward the closed position is generated by the cam member 8, the cam follower 13, and the spring member 14, and the toilet seat 1 is rotated a predetermined number of times by the balance. It can be stopped and held at the moving angle position, that is, it can be closed at a gentle speed. Further, the cam member 8, the cam follower 13 and the spring member 14 generate a torque repelling the torque in the direction of rotation of the toilet seat 1 to the closed state, so that the toilet seat 1 is placed on the toilet 3 as shown in FIG. It is possible to mitigate the impact when reaching the horizontal or nearly horizontal use mounting state, and to prevent the occurrence of collision noise. At that time, the first curved edge 7a of the cam member 8 is formed in a curve that acts to automatically close the toilet seat 1 immediately before reaching the toilet 3, that is, near an opening angle of 30 °.

  When the toilet seat 1 is placed on the toilet 3, the protrusion 12 of the cam follower 13 is positioned at the first curved edge 7 a of the cam member 8 and the spring member 14 is reliably held in the most compressed state.

  In order to lift the toilet seat 1 by hand and return it to the open state after the stool, the action of torque repelling the torque in the rotational direction to the closed posture of the toilet seat 1 generated by the cam member 8, the cam follower 13 and the spring member 14 Thus, the toilet seat 1 can be returned to the fully open state with a lighter operating force. At that time, the second curved edge 7b of the cam member 8 acts to automatically open by the urging force of the spring member 14 even if the hand is released from the toilet seat 1 when the toilet seat 1 exceeds an opening angle of about 45 °. It is formed in a curve. As described above, when the toilet seat 1 is opened, a large operating force is not required, so that the burden on the care recipient can be reduced as a nursing toilet.

  When the spring pressure of the spring member 14 acting on the cam follower 13 is too strong, the tubular leg 11 of the opening / closing hinge 6 is pulled out from the mounting hole 5 of the toilet 3, and the toilet seat 1 is removed from the toilet 3 together with the opening / closing hinge 6, The spring pressure can be lowered by rotating the bottom lid 26 in the opening direction. When the spring pressure is too weak, the spring pressure can be increased by rotating the bottom lid 26 in the opposite direction. When the spring pressure decreases with the fatigue of the spring member 14 over time, the bottom lid 26 may be rotated in the closing direction. These spring pressures can be finely adjusted by adjusting the screwing of the bottom lid 26. After the adjustment, the toilet seat 1 is attached to the toilet 3 together with the opening / closing hinge 6 by inserting the cylindrical leg portion 11 of the opening / closing hinge 6 into the attachment hole 5 of the toilet 3.

On the other hand, as shown in FIGS. 8 and 9, the toilet lid 2 is formed in a horseshoe-shaped blind wall in a plan view having a size capable of covering the entire upper surface of the toilet bowl 3 and the valve seat 1. A pair of left and right open / close hinges 15, 15 corresponding to the pair of left and right mounting holes 4, 4 of the toilet bowl 3 are provided on the rotation base end side behind the toilet lid 2.
The opening / closing hinge 15 is configured in the same structure as the opening / closing hinge 6, and as shown in FIG. 12, the cam surface is provided in a suspended manner on the rear rotation base end side of the toilet lid 2. 16 and a cam member 17 having an opposing wall 18 and 18 at the upper end, and a tubular member having a rectangular cross section in which the cam member 17 is pivotally connected around the hinge shaft 19 between the opposing walls 18 and 18. A leg 20 and a cam follower (slider) 22 having a quadrangular section in cross section, which is housed in the cylindrical leg 20 so as to be slidable in the vertical direction and has a protrusion 21 slidably contacting the cam surface 16 of the cam member 17. A spring member 23, which is housed under the cam follower 22 in the cylindrical leg 20, and which constantly presses and urges the cam follower 22 toward the cam surface 16 of the cam member 17, and the spring member 23 Spring pressure adjustment that can adjust spring pressure And a stage 29. The cam member 17, the cylindrical leg portion 20, the cam follower 22, and the like are resin molded products that can be washed in the same manner as the resin toilet lid 2.

  The cam surface 16 of the cam member 17 has a first curved edge 16a drawn in a gentle curve about the axis of the hinge shaft 19 and a first curved edge continuous to the rear end of the first curved edge 16a. And a second curved edge 16b drawn with a curvature larger than the curvature of 16a. The spring member 23 has a strength that gives a moment in the toilet lid opening direction to the toilet lid 2 including the cam member 17 against a moment in the closing direction due to the weight of the toilet lid 2.

  The toilet lid 2 can be attached to and detached from the toilet 3 together with the opening and closing hinge 15 by inserting the cylindrical legs 20 and 20 of the pair of left and right opening and closing hinges 15 and 15 into the left and right mounting holes 4 and 4 of the toilet 3 so as to be detachable. Mounted on. Thereby, the valve lid 2 together with the opening / closing hinge 15 can be easily cleaned by washing or the like.

The spring pressure adjusting means 29 adopts the same as the spring pressure adjusting means 27 of the above embodiment, and as shown in FIG. 12, a bottom opening 30 is formed at the bottom of the cylindrical leg portion 20, A bottom lid 31 formed with a spring receiving surface 31a for receiving the lower end of the spring member 23 on the bottom is screwed onto the bottom of the cylindrical leg 20 so as to close the bottom opening 30. In the illustrated example, a female screw 32 is provided on the inner periphery of the bottom opening 30, and a male screw 31 b provided on the outer periphery of the bottom cover 31 is screwed into the female screw 32 to attach the bottom cover 31 to the bottom of the cylindrical leg portion 20. On the other hand, although not shown, a male screw is provided on the outer periphery of the bottom of the cylindrical leg 20 and a female screw provided on the inner periphery of the bottom lid 31 is screwed into the male screw, whereby the bottom lid 31 is attached to the cylindrical leg. It can also be attached to the bottom of 20.
A concave portion 33 for hooking a tool such as a hexagon wrench is provided on the outer surface of the bottom lid 31, and a tool such as a hexagon wrench is hung on the concave portion 33 so that the bottom lid 31 can be easily rotated in the opening / closing direction. The bottom cover 31 is formed of a metal material so that it can sufficiently withstand the load of the spring member 23, while the cylindrical leg portion 20 that does not directly receive the load of the spring member 23 is formed of a plastic material.

Next, the operation of the opening / closing hinge 15 configured as described above will be described with reference to FIGS.
FIG. 12 shows a fully opened state in which the toilet lid 2 slightly exceeds the opening angle of 90 degrees and thereafter tilts slightly backward due to its own weight moment (see FIG. 1). In this fully open posture, the second curved edge 16b of the cam member 17 is separated from the protrusion 21 of the cam follower 22 rearward and the spring member 23 is extended, whereby the fully open posture of the toilet lid 2 is maintained.

  When the toilet lid 2 is rotated around the hinge shaft 19 in the closing direction from this fully open posture, first, the second curved edge 16b of the cam member 17 contacts the protrusion 21 of the cam follower 22 and presses the protrusion 21. As a result, the cam follower 22 is pushed down while contracting the spring member 23, and then the continuous portion of the second curved edge 16 b and the first curved edge 16 a, and the first curved edge 16 a forces the cam follower 22 to the force of the spring member 23. However, at this time, a torque repelling the torque in the direction of rotation of the toilet lid 2 toward the closed state is generated by the cam member 17, the cam follower 22, and the spring member 23, and the toilet lid 2 is balanced by the balance. Can be stopped and held at a predetermined rotational angle position, that is, can be closed at a moderate speed. Further, by generating a torque repelling the torque in the rotational direction of the toilet lid 2 to the closed state by the cam member 17, the cam follower 22 and the spring member 23, the toilet lid 2 is configured as shown in FIG. In addition, it is possible to alleviate the impact when the toilet seat 1 reaches a horizontal or nearly fully closed state. At this time, the first curved edge 16a of the cam member 17 is formed in a curve that acts to automatically close the toilet lid 2 immediately before reaching the toilet bowl 3 and the toilet seat 1, that is, around an opening angle of 30 °. Yes.

  When the toilet lid 2 is horizontally or nearly fully closed with respect to the toilet bowl 3 and the toilet seat 1, the protrusion 21 of the cam follower 22 is positioned at the first curved edge 16a of the cam surface 16 and the spring member is most compressed. Is held securely.

  After the stool, the toilet lid 2 is lifted up by hand to be in the open state by a torque repelling the torque in the direction of rotation of the toilet lid 2 in the closing direction generated by the cam member 17, the cam follower 22 and the spring member 23. The toilet lid 2 can be fully opened by a light operation force by the action. At that time, the second curved edge 16b of the cam member 17 acts to automatically open by the urging force of the spring member 23 even if the hand is released from the toilet lid 2 when the toilet lid 2 exceeds an opening angle of about 45 °. It is formed in such a curve. As described above, when the toilet lid 2 is opened, a large operating force is not required, so that the burden on the care recipient can be reduced even as a nursing toilet.

  When the spring pressure of the spring member 23 acting on the cam follower 22 is too strong, the cylindrical leg portion 20 of the opening / closing hinge 15 is pulled out from the mounting hole 4 of the toilet 3 and the toilet lid 2 is removed from the toilet 3 together with the opening / closing hinge 15. The spring pressure can be lowered by rotating the bottom lid 31 in the opening direction. Conversely, when the spring pressure is too weak, the spring pressure can be increased by rotating the bottom lid 31 in the closing direction. When the spring pressure decreases with the fatigue of the spring member 23 over time, the bottom lid 31 may be rotated in the closing direction. These spring pressures can be finely adjusted by adjusting the screwing of the bottom lid 31. After the adjustment, the toilet lid 2 is attached to the toilet bowl 3 together with the opening / closing hinge 15 by inserting the cylindrical leg portion 20 of the opening / closing hinge 15 into the mounting hole 4 of the toilet bowl 3.

In the above embodiment, the toilet seat 1 and the toilet lid 2 have the same opening and closing hinges 6 and 15 as the above structure, but only one of them adopts the hinge of the above structure and the other has another hinge different from that. It can also be adopted.
Moreover, in the said Example, although the cylindrical leg part which accommodates a cam follower and a spring member is attached to the western style toilet which is a 1st member, the toilet seat or toilet lid which is a 2nd member is provided with the cam member, On the contrary, it is also possible to provide a cam member on the side of the Western-style toilet as the first member, and attach a cylindrical leg portion that houses the cam follower and the spring member to the toilet seat or toilet lid as the second member.

  The hinge for opening and closing of the present invention is for opening and closing of a notebook personal computer comprising a keyboard body constituting the first member and a display device being the second member, in addition to the toilet lid and toilet seat of a Western-style toilet, and other small measuring instruments. It can be similarly applied as a hinge for opening and closing the body.

It is a side view of a western style toilet which shows the toilet seat by the hinge for opening and closing which shows one Example of this invention, and the fully open state of a toilet lid. It is a side view of a western style toilet bowl which shows the fully closed state of the toilet seat and the toilet lid. It is a partially broken top view of the western-style toilet which shows the toilet seat and the fully closed state of a toilet lid. It is a rear view of a western style toilet bowl which shows the toilet seat and the fully closed state of a toilet lid. It is a top view of a Western style toilet bowl. It is a top view of a toilet seat. It is a rear view of a toilet seat. It is a top view of a toilet lid. It is a rear view of a toilet lid. It is a vertical side view of the hinge for opening and closing which shows the fully open state of a toilet lid and a toilet seat. It is a vertical side view of the hinge for opening and closing which shows the fully closed state of a toilet lid and a toilet seat. It is a vertical side view of the hinge for opening and closing which shows the fully open state of a toilet lid and a toilet seat. It is a vertical side view of the hinge for opening and closing which shows the fully closed state of a toilet lid and a toilet seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Toilet seat 2 Toilet lid 3 Western style toilet 4,5 Mounting hole 6,15 Opening / closing hinge 7,16 Cam surface 7a, 16a First curved edge 7b, 16b Second curved edge 8,17 Cam member 10,19 Hinge shaft 11, 20 Cylindrical legs 12, 21 Protrusions 13, 22 Cam followers 14, 23 Spring members 24, 29 Spring pressure adjusting means 25, 30 Bottom openings 26, 31 Bottom lids 26a, 31a Spring receiving surfaces 28, 33 Recess

Claims (4)

A cam member having a cam surface provided on one of the first member and the second member that are relatively opened and closed and pivoted is pivotally connected to the cam member so as to be rotatable about a hinge axis. A cylindrical leg portion mounted on the other member side of the first member and the second member, and a protrusion which is slidably accommodated in the cylindrical leg portion and slidably contacts the cam surface. A cam follower, and a spring member that is housed in the cylindrical leg portion and constantly presses and urges the cam follower toward the cam surface. The cam member, the cam follower, and the spring member serve as the first follower. A torque repelling the torque in the direction of rotation of the member or the second member toward the closed posture is generated, and the first member or the second member is stopped and held at a predetermined rotation angle position by the balance. For opening and closing hinges of the opening and closing body Stomach,
An opening / closing hinge for an opening / closing body, comprising spring pressure adjusting means capable of adjusting a spring pressure of the spring member.   The spring pressure adjusting means has a bottom lid in which a bottom opening is formed at the bottom of the cylindrical leg, and a spring receiving surface for receiving an end of the spring member is formed on the inner surface of the bottom of the cylindrical leg. The opening / closing hinge of the opening / closing body according to claim 1, wherein the opening / closing body is screwed and attached so as to close the bottom opening.   The opening / closing hinge of the opening / closing body according to claim 2, wherein a recess for hanging a tool is provided on an outer surface of the bottom cover. The opening / closing hinge for an opening / closing body according to any one of claims 1 to 3, wherein the cylindrical leg portion is formed of a plastic material and the bottom cover is formed of a metal material.

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