JP2012237323A - Hinge mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hinge mechanism which is provided with a stopper capable of being operated in front of the mechanism.SOLUTION: The hinge mechanism is configured so as to provide a stopper portion b3 which projects more backward than a support shaft 1 in an opening/closing body b and to provide the stopper d capable of moving in back surface of back side standing piece a3 of a support member (a). Then, it is configured so as to provide a bolt 14 penetrated from front side to rear side of the back side standing piece of the support member or to hold the stopper d in fixed position and hold it in movable position by the bolt 14 and to prevent the opening/closing body b from being revolved over more than regulated position when the stopper portion b3 abuts to the stopper d which is in the fixed position, and to allow the stopper d to be receded from the regulated position when holding the stopper d in the movable position by operating the bolt 14 from the front side of the back side standing piece a3 of the support member (a).

Description

  The present invention relates to a hinge mechanism for connecting a reading device such as a copying machine and a lid.

  For example, if the lid of a copier is opened to 90 degrees, it will open too much, and the operability during the copying operation will be poor. Problems such as losing reach.

In the case of a copying machine, a spring force is applied up to a range of about 60 degrees, but the spring force becomes an assist force when the lid is opened, and suddenly when the lid is closed. It functions as a damping force to prevent this.
In the range of 60 degrees to 90 degrees, the spring force is released to make a free rotation range. This is to cope with a special case such as repair of a copying machine.

  In any case, in the copying machine, the spring force is applied when the lid is in the range of 0 to 60 degrees, and the spring force is opened in the range of 60 to 90 degrees. If the lid is opened vigorously, the lid may open up to 90 degrees at a stroke by the action of the spring force. At this time, since the inertial force of the lid is large, the hinge mechanism is damaged, and when it is severe, the reading device itself is tilted.

In addition, when repairing or the like with the lid wide open to 90 degrees, if a force in the direction of closing the lid acts on the lid, the lid rotates to the position of 60 degrees where no spring force is acting. However, at that moment, the lid may close at once. In such a case, if a head or the like is inserted between the reader and the lid, there is a problem such as injury.
In consideration of this, for example, it is usual to provide a stopper for preventing the lid of the copying machine from opening more than a certain opening degree.

A conventionally known hinge mechanism is provided with a stopper behind the hinge mechanism, and a stopper provided on the rear side of the hinge mechanism is screwed from behind. Therefore, when releasing the stopper, it was necessary to go back and loosen the screw to remove it.
In addition, although the patent gazette was investigated about the prior art, the relevant thing was not found.

In some cases, it was necessary to release the stopper for maintenance or other purposes. In the past, the stopper itself was provided on the rear side of the hinge mechanism, and it was screwed from behind, so the stopper was released. Sometimes it was necessary to go back and loosen the screw and remove the stopper on the back. Since the stopper could only be released from behind, there was a problem that the operability was poor. In particular, since copies and the like are often placed along the wall side, the fact that they can only be operated from behind has a problem that the operability is further deteriorated.
The objective of this invention is providing the hinge mechanism provided with the stopper which can be operated from the front.

  The present invention includes an opening / closing body that is fixed to a holding plate side that holds an object to be read, and a support member that is rotatably connected to the opening / closing body via a support shaft and is fixed to the reading device side. The present invention relates to a hinge mechanism in which a spring member is interposed between a body and a support member, and a force in the opening direction is applied to the opening / closing body by the action of the spring force of the spring member.

  According to a first aspect of the present invention, the opening / closing body is provided with a stopper portion that protrudes rearward from the support shaft at a position that restricts rotation of the opening / closing body in the opening direction. Provided on the back is a movable stopper, and an operation member is provided that penetrates from the front side to the rear side of the back upright piece of the support member. The operation member can hold the stopper in a fixed position or move to a movable position. The opening / closing body is prevented from rotating more than the restriction position when the stopper portion comes into contact with the stopper at the fixed position, while the front side of the back standing piece of the support member. When the operation member is operated from above to hold the stopper at the movable position, the stopper can be retracted from the restriction position.

  According to a second aspect of the present invention, the stopper portion is provided with a relief groove, while the stopper is slidable between a movable position corresponding to the relief groove and a fixed position that is different from the relief groove. It is characterized in that the stopper is slid through an operation member.

  According to a third aspect of the present invention, the stopper is provided on the back surface of the back upright piece of the support member so that the stopper can be rotated in a range from a position in contact with the stopper portion to a position not in contact with the stopper portion. Accordingly, the movable position and the fixed position are held accordingly, and the stopper is rotated to the movable position and the fixed position via the operation member.

According to the first aspect, since the position of the stopper can be controlled from the front of the hinge mechanism, the operability is better than that operated from the rear side of the hinge mechanism as in the prior art.
Further, since the stopper is movably provided on the back-side standing piece of the support member, it is not necessary to remove the stopper when adjusting the position of the stopper, and the operability is improved accordingly.

  According to the second and third inventions, the position can be adjusted by sliding or rotating the stopper, so that the operability is further improved.

It is sectional drawing of the state which maintained the angle of the support member of 1st Embodiment, and the opening-closing body at 60 degree | times. It is a front view of the state which maintained the angle of the support member of 1st Embodiment, and the opening-closing body at 60 degree | times. It is sectional drawing of the state which maintained the angle of the support member of 1st Embodiment and the opening-closing body at 90 degree | times. It is a front view of the state which maintained the angle of the support member of 1st Embodiment, and the opening-closing body at 90 degree | times. It is a perspective view of the support member of a 1st embodiment. It is a perspective view of the state seen from the back side which shows 1st Embodiment and maintained the angle of 60 degree | times. It is a rear view of the state which maintained the angle of 60 degree | times of 1st Embodiment. It is a perspective view showing the 1st embodiment and seen from the back side in the state where an angle of 90 degrees was maintained. It is a rear view of the state which maintained the angle of 90 degrees of 1st Embodiment. It is a perspective view of the stopper of a 1st embodiment. It is a perspective view seen from the back side showing the 2nd embodiment and maintaining the angle of 60 degrees. It is a partial step view which maintained the angle of 60 degrees of 2nd Embodiment. It is a perspective view of the stopper of a 2nd embodiment. It is a perspective view which shows 3rd Embodiment and was seen from the back side of the state which maintained the angle of 60 degree | times. It is a partial step view which maintained the angle of 60 degrees of 3rd Embodiment. It is a perspective view of the stopper of 3rd Embodiment. It is sectional drawing of the state which maintained the angle of the support member of 4th Embodiment and the opening-closing body at 60 degree | times. It is sectional drawing of the state which maintained the angle of the support member of 4th Embodiment and the opening-closing body at 90 degree | times. It is a perspective view of the stopper of a 4th embodiment.

  The first embodiment shown in FIGS. 1 to 10 is a hinge mechanism used in a copying machine, and this hinge mechanism is supported by a support member a that is fixed to the reading device X side of the copying machine and the first support shaft 1. An opening / closing body b supported rotatably with the support member a, and a lifting member c supported rotatably with the opening / closing body b via the second support shaft 2.

The support member a is provided with both side upright pieces a2 and a2 on both sides of the flat plate portion a1 fixed to the reading device X side of the copying machine, and with a back side upright piece a3 between the both side upright pieces a2 and a2. (See FIG. 5).
Support pieces a6 and a6 are provided on the rear extension of the both-side upright pieces a2 and a2, and the support pieces a6 and a6 project further rearward than the back upright piece a3. And the step part is formed in the upper end of this support piece a6, a6, and this step part is made into the largest angle control part a7.
The flat plate portion a1 is formed with a bolt hole a4 for fixing the support member a to the reading device X, and both side pieces a2 and a2 are formed with shaft holes a5 and a5. The first support shaft 1 is supported in the holes a5 and a5.

  Further, a pair of shaft members 3 and 3 as a first operating body are provided slightly below the shaft holes a5 and a5, and as is apparent from FIG. The axis center lines of each other are matched. And the front-end | tip of these shaft members 3 and 3 is mutually opposing with the space | interval maintained.

Further, the first support shaft 1 supported between the shaft holes a5 and a5 supports the opening / closing body b so as to be rotatable. The opening / closing body b has hanging pieces b2, b2 on both sides of the upper plate b1. While being formed, the first support shaft 1 penetrates the hanging pieces b2 and b2 and is supported by the shaft holes a5 and a5.
And it is upper board b1 of the above-mentioned opening-and-closing body b, and the end by the side of the 1st support shaft 1 is made to project further back rather than this 1st support shaft 1, and this projecting part serves as stopper part b3, A pair of escape grooves b4 and b4 are formed in parallel in the stopper portion b3.

  Further, the second support shaft 2 is stretched over the hanging pieces b2 and b2 on the side opposite to the side supported by the first support shaft 1, and as shown in FIG. Both ends of the shaft 2 are protruded from the hanging pieces b2 and b2, and a lift member c is rotatably connected to the protruding ends. That is, the lift member c is shaped to cover the opening / closing body b, and both side pieces c2, c2 suspended from both sides of the upper plate c1 are placed along the outside of the hanging pieces b2, b2 of the opening / closing body b. The lift member c is rotatably supported by passing the tip of the second support shaft 2 through c2 and c2. The opening / closing body b and the lift member c thus configured rotate in opposite directions around the first and second support shafts 1 and 2.

  A shaft 13 is stretched between the support pieces a6 and a6 provided on the support member a, and a stopper d is provided on the shaft 13 so as to be slidable in the axial direction. That is, as shown in FIG. 10, the stopper d includes a pair of stopper pieces d1, d1 and a plate portion d2 provided between the stopper pieces d1, d1. The stopper pieces d1, d1 are formed with shaft holes d3, d3 through which the shaft 13 passes, and the plate part d2 is formed with a bolt hole d4 through which the bolt 14 which is an operating member of the present invention is passed. ing.

The stopper d as described above is slidably attached to the shaft 13 so that the plate portion d2 is along the back surface of the back-side upright piece a3 of the support member a.
On the other hand, a long hole a8 parallel to the shaft 13 is formed in the back standing piece a3, and the long hole a8 and the bolt hole d4 are aligned so that the front side of the back standing piece a3 of the support member a. The bolt 14 which is an operation member of this invention is penetrated toward the rear side. A plus groove or a minus groove into which a screwdriver is inserted is formed in the head portion 14a of the bolt 14 located on the front surface of the back-side upright piece a3. Accordingly, the bolt 14 can be operated from the front surface of the hinge mechanism to loosen or tighten it.

  Then, by moving the bolt 14 along the long hole a8, the stopper d slides along the shaft 13. When the bolt 14 is positioned at one end of the long hole a8, the stopper piece d1, As shown in FIG. 6, when the d1 is different from the escape grooves b4 and b4 and the bolt 14 is positioned at the other end of the long hole a8, the stopper pieces d1 and d1 become the escape grooves b4 and b4 as shown in FIG. It is made to coincide with b4.

And when the stopper part b3 of the opening / closing body b hits the stopper piece parts d1, d1 in a state where the stopper piece parts d1, d1 are different from the escape grooves b4, b4, the opening / closing body b is at an angular position of 60 degrees. So that it can be kept. On the other hand, when the stopper pieces d1 and d1 coincide with the escape grooves b4 and b4, the stopper pieces d1 and d1 enter the escape grooves b4 and b4, and the opening / closing body b rotates by 60 degrees or more. It becomes possible. However, when the stopper b3 of the opening / closing body b hits the maximum angle restricting portion a7 of the support member a, the rotation is blocked. At this time, the opening / closing body b is maintained at an angle of 90 degrees. I have to.
Although the escape grooves b4, b4 and the stopper pieces d1, d1 are provided in pairs, they may be provided one by one. In short, it is only necessary to restrict the rotation of 60 degrees or more when the stopper piece d1 is different from the escape groove groove b4 and to enable the rotation of 60 degrees or more when they coincide with each other.

On the other hand, the lift member c supported by the second support shaft 2 is provided with a second operating body 4 between both side pieces c2 and c2, and this second operating body 4 is provided between the both side pieces c2 and c2. A roller is rotatably provided on one spanned shaft.
Reference numerals c3 and c3 are attachment pieces provided on the lower side of the both side pieces c2 and c2, and are fixed to a pressing plate Y (see FIG. 1) which is a lid of the copying machine. That is, the both side pieces c2 and c2 are embedded in the pressing plate Y (hereinafter referred to as “lid Y”) to fix the mounting pieces c3 and c3 to the lid Y.

Further, the first and second sliders 5 and 6 are slidably incorporated between the guide surfaces which are the inner facing surfaces of the hanging pieces b2 and b2 of the opening / closing body b. A coil spring 7 that exerts a spring force during compression is interposed therebetween. The coil spring 7 constitutes the spring member of the present invention.
The first slider 5 is brought into pressure contact with the first support shaft 1 and the second slider 6 is brought into pressure contact with the second operating body 4 by the action of the spring force of the coil spring 7. , 6 are incorporated between the first support shaft 1 and the second operating body 4.

As shown in FIG. 2, the first slider 5 is integrally formed with an anti-pinch member 8 formed of a convex portion formed on the front surface thereof, but the anti-pinch member on both sides of the anti-pinch member 8. The cam surfaces 9 and 9 are formed at right angles to 8.
The shaft members 3 and 3 as the first operating body perform an arc motion around the first support shaft 1 in the process in which the opening and closing body b rotates with respect to the support member a, and 0 degrees to 60 degrees. The cam surfaces 9 and 9 are pushed in the process of rotating in the range of degrees, the first slider 5 is pushed while bending the coil spring 7, and the first slider 5 is separated from the first support shaft 1.

When the angle between the support member a and the opening / closing body b is in a range of a set angle or less, for example, in this embodiment, a range of 60 degrees or less, the shaft members 3 and 3 are in contact with the cam surfaces 9 and 9 and 60 degrees. In the range of ˜90 degrees, the shaft members 3, 3 as the first operating body are configured to be kept away from the cam surfaces 9, 9.
When the opening / closing body b is maintained at a position of 90 degrees with respect to the support member a, the stopper part b3 of the opening / closing body b hits the maximum angle restricting part a7 of the support member a as described above and rotates 90 degrees or more. I try not to.

Further, as described above, the first slider 5 moves against the coil spring 7 to bend the coil spring 7, and the spring force of the coil spring 7 at that time pushes up the lid Y, that is, the lid Y. Acts as a torque in the direction of opening. Therefore, for example, in a copying machine, when the lid Y is opened from the closed state, the spring force of the coil spring 7 becomes an assist force with respect to the force for opening the lid Y.
On the other hand, when the lid Y in the opened state is closed, the spring force of the coil spring 7 acts as a damping force for preventing the lid Y from dropping suddenly.

  On the other hand, in a state where the shaft members 3, 3 as the first operating body are pressed against the cam surfaces 9, the pinching prevention member 8 is configured to protrude between the opposed portions of the shaft members 3, 3. The length of the pinching prevention member 8 in the rotation direction of the opening / closing body b and the support member a is the first slider with which the shaft members 3 and 3 are in contact with each other in the process of rotating the opening / closing body b and the support member a. 5 is approximately equal to or longer than the contact range of 5. Therefore, the pinching prevention member 8 is necessarily positioned between the shaft members 3 and 3 in a situation where the relative positions of the shaft members 3 and 3 and the first slider 5 change.

  Since the pinching prevention member 8 provided on the first slider 5 protrudes between the shaft members 3 and 3 as the first operating body in this way, for example, a copy document as a reading object is connected to the shaft members 3 and 3. Even if it tries to enter between the first slider 5, the pinching prevention member 8 cannot get in because it gets in the way. The same is true for human fingers.

The lift member c rotatably supported by the second support shaft 2 is for rotating in a direction opposite to the opening / closing body b when copying a predetermined page of a thick book, for example.
That is, in order to copy a thick book, when the book is placed on the reading device X and rotated in the direction in which the lid Y is closed in this state, the opening / closing body b and the lift member c are moved until the lid Y hits the book. Are integrally rotated around the first support shaft 1.

  When the lid Y hits the book, the opening / closing body b stops its rotation and stops at that position. If the lid Y is further rotated with the opening / closing body b stopped in this way, this time, Only the lift member c rotates about the second support shaft 2, and the support member a and the lift member c are parallel to each other while maintaining an interval corresponding to the thickness of the book.

The first slider 5 is provided with a spring receiver 10, and the tip of an adjustment bolt 11 is rotatably fitted to the spring receiver 10. The adjustment bolt 11 thus configured is protruded outward of the pinching prevention member 8 through the screw hole 12 formed in the first slider 5 and the pinching prevention member 8.
When the adjusting bolt 11 is rotated with respect to the screw hole 12, the adjusting bolt 11 moves in the axial direction with respect to the screw hole 12, and the spring receiver 10 is moved to bend the coil spring 7. Can be adjusted.

  FIG. 1 shows a state in which the opening degree of the opening / closing body b and the lift member c with respect to the support member a, that is, the opening degree of the lid Y is maintained at approximately 60 degrees. In FIG. 3, the opening degree of the opening / closing body b and the lift member c with respect to the support member a, that is, the opening degree of the lid Y is maintained at approximately 90 degrees.

  When the lid Y is at a position of 60 degrees, the first, second sliders 5 and 6 hold the initial position, the coil spring 7 maintains the maximum extension state, and the spring force is minimized. In the range of 60 degrees to 90 degrees, the shaft members 3, 3 as the first operating body are separated from the cam surfaces 9, 9 of the first slider 5. Therefore, in this state, that is, in the range of 60 degrees to 90 degrees, the torque to open the lid Y by the spring force of the coil spring 7 becomes zero, and in the range of 60 degrees to 90 degrees, the lid Y is It is in the free rotation range where the spring force does not act.

  Note that the range of 60 degrees to 90 degrees where the spring force of the coil spring 7 does not act is hardly used during the operation of copying a document. However, it is necessary to open the lid Y largely at the time of repairing the copy machine, and in this case, the lid Y may be opened up to 90 degrees.

When the lid Y is rotated in the closing direction from the state shown in FIG. 1 where the opening degree of the lid Y is maintained at 60 degrees, the shaft member 3, which is the first operating body, can be expressed in a relative manner. 3 pushes the first slider 5 and moves the first slider 5 against the coil spring 7. At this time, since the second slider 6 is pressed against the second operating body 4 and does not retreat further, if the first slider 5 moves as described above, the coil spring 7 is bent and exerts a spring force.
In addition, when the first slider 5 moves against the coil spring 7, the first support shaft 1 and the shaft members 3, 3 as the first operating body exert torque on the first slider 5. The arm length gradually decreases.

Accordingly, the torque in the direction of opening the lid Y changes in the relative relationship between the spring force of the coil spring 7 and the arm length that exerts the above torque. The torque in the first embodiment is Y is the minimum when the opening degree is 60 degrees, and as the lid Y is closed, the torque increases, and the opening degree is set so that the torque becomes maximum when the opening degree is around 10 to 15 degrees. Yes.
The torque acts as a damping force for preventing the lid Y from being closed suddenly by its own weight.

When the opening is smaller than 10 to 15 degrees, the amount of deflection of the coil spring 7 is increased. However, as described above, the length of the arm that exerts torque is shortened and the weight of the lid Y is determined. When the moment in the closing direction acts as a whole, the force in the direction of opening the lid Y suddenly weakens, and when the opening is zero, which is the state in which the lid Y is completely closed, the amount of deflection of the coil spring 7 is maximized. However, the arm length between the support shaft 1 and the shaft members 3 and 3 for applying torque to the first slider 5 is minimized, and the torque for opening the lid Y is minimized.
In this way, when the torque for opening the lid is minimum, the lid Y is kept closed and the document is pressed by the weight of the lid Y.

In addition, while maintaining a space | interval between the upper board b1 of the said opening-and-closing body b and the upper board c1 of the lift member c, the pin holes b5 and c4 which penetrate these both upper boards b1 and c1 are formed (FIG. 6). reference). A pin (not shown) is inserted into the pin holes b5 and c4, and the first slider 5 is moved against the spring force of the coil spring 7 so as to hold the moving position. That is, in the assembling process for assembling the support member a and the opening / closing body b, the pins are inserted to temporarily retract the first slider 5 to facilitate the assembling work of the support member a and the opening / closing body b.
The greatest feature of the configuration as described above is that the upper plates b1 and c1 that are spaced apart are used. If the pins are passed through the upper plates b1 and c1 that are spaced apart from each other, the pins cannot fall down. It is the one that paid attention.

In the first embodiment as described above, the bolt 14 is held at one position with respect to the elongated hole a8 of the support member a during normal use, and the stopper pieces d1, d1 and the relief grooves b4, Make a mistake with b4. In this way, when the lid Y is opened, even if the spring force of the coil spring 7 acts as an assisting force and the lid Y jumps up vigorously, it is prevented from opening 60 degrees or more by the stopper d. Is done.
Therefore, in the first embodiment, the 60 degrees is the restriction position of the present invention, and the positions where the stopper pieces d1 and d1 of the stopper d are different from the escape grooves b4 and b4 are the fixed positions of the present invention. . However, the restriction position is not necessarily limited to 60 degrees, and may be arbitrarily determined as necessary.

  When it is desired to open the lid Y beyond the restriction position, a screwdriver or the like is inserted into the groove formed in the head portion 14a of the bolt 14 from the front of the support member a to loosen the bolt 14, and the bolt 14 together with the driver is in that state. Is moved to the other position of the long hole a8, the stopper d is also moved along the shaft 13, and the stopper pieces d1, d1 can be made to coincide with the escape grooves b4, b4.

In the above state, the opening / closing body b freely rotates up to a range of 90 degrees, but the opening / closing body b does not open more than 90 degrees because the stopper part b3 hits the maximum angle restricting part a7.
The position where the stopper pieces d1, d1 of the stopper d coincide with the relief grooves b4, b4 is the movable position of the present invention.
In any case, according to the first embodiment, since the bolt 14 can be operated from the front of the support member a, the operability is extremely good.
In the first embodiment, the pair of escape grooves b4 and b4 and the stopper pieces d1 and d1 are provided. However, it is sufficient that at least one of them is provided.

In the second embodiment shown in FIGS. 11 to 13, the correspondence between the stopper d and the stopper portion b <b> 3 is the same as that of the first embodiment. However, in the second embodiment, the first support shaft 1 is passed through the shaft hole d3 formed in the stopper d, and the stopper d slides along the first support shaft 1 in the first embodiment. It is different from the form.
The configuration other than the above is the same as that of the first embodiment, and detailed description of the same configuration and operation as those of the first embodiment is omitted.

  In the third embodiment shown in FIGS. 14 to 16, a hook portion d5 is formed on the stopper d, and the hook portion d5 is slidably hooked on the upper side of the back side standing piece a3 of the support member a. is there. Other configurations are the same as those in the first embodiment. Therefore, in the first embodiment, detailed description of the same configurations and operations as those in the first embodiment is omitted.

  The fourth embodiment shown in FIGS. 17 to 19 is the same as the first embodiment in that the stopper pieces d1 and d1 are provided on the stopper d, and the plate portion d2 is provided between them. The fourth embodiment is different from the first embodiment in the following points. That is, the shaft holes d6 and d6 are formed below the stopper pieces d1 and d1, and the shaft 15 spanned between the support pieces a6 and a6 of the support member a is passed through the shaft holes d6 and d6, and the stopper d is inserted. It is pivotably supported. Then, the same bolt 14 as in the first embodiment is inserted into the bolt hole d4 formed in the plate part d2, and the bolts 14 are loosened so that the stopper pieces d1 and d1 are stopped as shown in FIG. The configuration is such that the part b3 can be retracted outside the rotation range. Further, by tightening the bolt 14, as shown in FIG. 17, the opening / closing body b is configured not to be opened more than 60 degrees while being kept within the rotation range of the stopper portion b3.

Therefore, in the fourth embodiment, the position where the stopper pieces d1, d1 are retracted outside the rotation range of the stopper b3 is the movable position of the present invention, and the stopper pieces d1, d1 are rotated around the stopper b3. The position within the moving range is the fixed position of the present invention.
17 and 18, reference numeral 14 b is a retaining washer provided at the tip of the bolt 14.

  It is optimal as a hinge mechanism that connects the reading device of the copier and the lid.

a support member a3 back upright piece b opening / closing body b3 stopper part b4 escape groove d stopper 1 support shaft 7 coil spring 14 which is a spring member bolt

Claims (3)

  An opening / closing body that is fixed to a holding plate side that holds an object to be read, and a support member that is rotatably connected to the opening / closing body via a support shaft and that is fixed to the reading device side. In the hinge mechanism configured to apply a force in the opening direction to the opening / closing body by the action of the spring force of the spring member, the opening / closing body includes the opening / closing body. A stopper portion that protrudes rearward from the support shaft is provided at a position that restricts rotation in the opening direction, and a movable stopper is provided on the back surface of the back-side standing piece of the support member. An operating member that penetrates from the front side to the rear side of the side upright piece is provided, and the stopper is held at the fixed position or at the movable position by the operating member. When the stopper portion comes into contact with the par, the opening / closing body is prevented from rotating beyond the regulation position, while the operation member is operated from the front side of the back-side standing piece of the support member to move the stopper to the movable position. A hinge mechanism in which the stopper can be retracted from the restricting position when held in place. While the stopper portion is provided with a relief groove, the stopper is slidable between a movable position corresponding to the relief groove and a fixed position that conflicts with the relief groove,
The hinge mechanism according to claim 1, wherein the stopper is slid through the operation member.   Provided on the back surface of the back standing piece of the support member is the stopper that is rotatable in a range from a position in contact with the stopper portion to a position not in contact with the stopper portion, and the movable position according to the rotation position. The hinge mechanism according to claim 1, wherein the stopper mechanism is configured to rotate between a movable position and a fixed position via the operation member while holding the fixed position and the fixed position.

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